0001140361-24-036613 | 10-Q | XBRL Viewer

Description of Business

6 Months Ended

Jun. 30, 2024

1.	Description of Business

NBT Bancorp Inc. is a registered financial holding company incorporated in the state of Delaware in 1986, with its principal headquarters located in Norwich, New York. The principal assets of NBT Bancorp Inc. consist of all of the outstanding shares of common stock of its subsidiaries, including: NBT Bank, National Association (the “Bank”), NBT Financial Services, Inc. (“NBT Financial”), NBT Holdings, Inc. (“NBT Holdings”), CNBF Capital Trust I, NBT Statutory Trust I, NBT Statutory Trust II, Alliance Financial Capital Trust I and Alliance Financial Capital Trust II (collectively, the “Trusts”). The principal sources of revenue for NBT Bancorp Inc. are the management fees and dividends it receives from the Bank, NBT Financial and NBT Holdings. Collectively, NBT Bancorp Inc. and its subsidiaries are referred to herein as (the “Company”).

The Company’s business, primarily conducted through the Bank, consists of providing commercial banking, retail banking and wealth management services primarily to customers in its market area, which includes upstate New York, northeastern Pennsylvania, southern New Hampshire, western Massachusetts, Vermont, southern Maine and central and northwestern Connecticut. The Company has been, and intends to continue to be, a community-oriented financial institution offering a variety of financial services. The Company’s business philosophy is to operate as a community bank with local decision-making, providing a broad array of banking and financial services to retail, commercial and municipal customers. The Company completed the acquisition of Salisbury in August of 2023, a commercial bank with $1.46 billion in assets with 13 banking offices in northwestern Connecticut, the Hudson Valley region of New York and southwestern Massachusetts.

Reclassification Adjustments Out of Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2024

Reclassification Adjustments Out of Other Comprehensive Income (Loss) [Abstract]

Reclassification Adjustments Out of Other Comprehensive Income (Loss)

10.	Reclassification Adjustments Out of Other Comprehensive Income (Loss)

The following table summarizes the reclassification adjustments out of AOCI:

Detail About AOCI Components	Amount Reclassified from AOCI						Affected Line Item in the Consolidated Statements of Comprehensive Income (Loss)
	Three Months Ended
(In thousands)	June 30, 2024			June 30, 2023
AFS securities:
Losses on AFS securities	$	-		$	4,450		Net securities (gains) losses
Amortization of unrealized gains related to securities transfer		91			109		Interest income
Tax effect	$	(23	)	$	(1,141	)	Income tax (benefit)
Net of tax	$	68		$	3,418

Pension and other benefits:
Amortization of net losses	$	1,454		$	640		Other noninterest expense
Amortization of prior service costs		(3	)		9		Other noninterest expense
Tax effect	$	(363	)	$	(162	)	Income tax (benefit)
Net of tax	$	1,088		$	487

Total reclassifications, net of tax	$	1,156		$	3,905

Detail About AOCI Components	Amount Reclassified from AOCI						Affected Line item in the Consolidated Statements of Comprehensive Income (Loss)
	Six Months Ended
(In thousands)	June 30, 2024			June 30, 2023
AFS securities:
Losses on AFS securities	$	-		$	9,450		Net securities (gains) losses
Amortization of unrealized gains related to securities transfer		187			223		Interest income
Tax effect	$	(47	)	$	(2,419	)	Income tax (benefit)
Net of tax	$	140		$	7,254


Pension and other benefits:
Amortization of net losses	$	1,908		$	1,280		Other noninterest expense
Amortization of prior service costs		(5	)		18		Other noninterest expense
Tax effect	$	(476	)	$	(325	)	Income tax (benefit)
Net of tax	$	1,427		$	973

Total reclassifications, net of tax	$	1,567		$	8,227

Short-Term Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Short-Term Debt [Abstract]
Short-term borrowings	$ 224,703	$ 386,651
Federal Funds Purchased [Member]
Short-Term Debt [Abstract]
Short-term borrowings	15,000	0
Securities Sold under Repurchase Agreements [Member]
Short-Term Debt [Abstract]
Short-term borrowings	95,703	93,651
Other Short-Term Borrowings [Member]
Short-Term Debt [Abstract]
Short-term borrowings	$ 114,000	$ 293,000

Securities, Available for Sale (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Debt securities, available-for-sale [Abstract]
Amortized cost	$ 1,627,401		$ 1,627,401		$ 1,615,078
Unrealized gains	86		86		47
Unrealized losses	(188,042)		(188,042)		(184,267)
Estimated fair value	1,439,445		1,439,445		1,430,858
Allowance for credit losses on AFS securities	0		0		0
Gross realized gains	0
Gross realized losses	0	$ 4,500		$ 4,500
Gain recognized on sale of previously written-off security			2,300
U.S. Treasury [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	143,571		143,571		133,302
Unrealized gains	5		5		0
Unrealized losses	(8,266)		(8,266)		(8,278)
Estimated fair value	135,310		135,310		125,024
Federal Agency [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	248,366		248,366		248,384
Unrealized gains	0		0		0
Unrealized losses	(34,040)		(34,040)		(33,644)
Estimated fair value	214,326		214,326		214,740
State & Municipal [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	95,856		95,856		96,251
Unrealized gains	0		0		11
Unrealized losses	(9,854)		(9,854)		(9,956)
Estimated fair value	86,002		86,002		86,306
Mortgage-Backed, Government Sponsored Enterprises [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	375,011		375,011		399,532
Unrealized gains	1		1		7
Unrealized losses	(45,918)		(45,918)		(44,264)
Estimated fair value	329,094		329,094		355,275
Mortgage-Backed, U.S. Government Agency Securities [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	70,600		70,600		74,281
Unrealized gains	9		9		14
Unrealized losses	(7,371)		(7,371)		(7,302)
Estimated fair value	63,238		63,238		66,993
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	477,441		477,441		452,715
Unrealized gains	71		71		15
Unrealized losses	(49,064)		(49,064)		(48,257)
Estimated fair value	428,448		428,448		404,473
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	168,095		168,095		162,171
Unrealized gains	0		0		0
Unrealized losses	(27,055)		(27,055)		(25,100)
Estimated fair value	141,040		141,040		137,071
Corporate [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	48,461		48,461		48,442
Unrealized gains	0		0		0
Unrealized losses	(6,474)		(6,474)		(7,466)
Estimated fair value	$ 41,987		$ 41,987		$ 40,976
Loss on the write-off of an AFS debt security				$ 5,000

Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets
Cash and due from banks	$ 172,313	$ 173,811
Short-term interest-bearing accounts	35,207	31,378
Equity securities, at fair value	40,087	37,591
Securities available for sale, at fair value	1,439,445	1,430,858
Securities held to maturity (fair value $780,490 and $814,524, respectively)	878,909	905,267
Federal Reserve and Federal Home Loan Bank stock	38,314	45,861
Loans held for sale	3,183	3,371
Loans	9,854,347	9,650,713
Less allowance for loan losses	120,500	114,400
Net loans	9,733,847	9,536,313
Premises and equipment, net	78,713	80,675
Goodwill	361,851	361,851
Intangible assets, net	36,835	40,443
Bank owned life insurance	269,310	265,732
Other assets	413,895	395,889
Total assets	13,501,909	13,309,040
Liabilities
Demand (noninterest bearing)	3,333,828	3,413,829
Savings, NOW and money market	6,532,834	6,230,456
Time	1,404,797	1,324,709
Total deposits	11,271,459	10,968,994
Short-term borrowings	224,703	386,651
Long-term debt	29,721	29,796
Subordinated debt, net	120,462	119,744
Junior subordinated debt	101,196	101,196
Other liabilities	292,413	276,968
Total liabilities	12,039,954	11,883,349
Stockholders' equity
Preferred stock, $0.01 par value. 2,500,000 shares authorized	0	0
Common stock, $0.01 par value. 100,000,000 shares authorized; 53,974,492 shares issued	540	540
Additional paid-in-capital	741,933	740,943
Retained earnings	1,058,187	1,021,831
Accumulated other comprehensive loss	(162,919)	(160,934)
Common stock in treasury, at cost, 6,809,123 and 6,864,593 shares, respectively	(175,786)	(176,689)
Total stockholders' equity	1,461,955	1,425,691
Total liabilities and stockholders' equity	$ 13,501,909	$ 13,309,040

Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reclassification Adjustment out of AOCI [Abstract]
Net securities (gains) losses	$ (92)	$ (4,641)	$ 2,091	$ (9,639)
Interest income	97,174	89,085	192,348	184,151
Other noninterest expense	5,518	5,690	11,753	10,770
Income tax (benefit)	9,203	8,658	18,594	18,244
Net income	32,716	30,072	66,539	63,730
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of AOCI [Abstract]
Total reclassifications, net of tax	1,156	3,905	1,567	8,227
Accumulated Net Unrealized Investment Gain (Loss) [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of AOCI [Abstract]
Income tax (benefit)	(23)	(1,141)	(47)	(2,419)
Net income	68	3,418	140	7,254
Losses on AFS Securities [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of AOCI [Abstract]
Net securities (gains) losses	0	4,450	0	9,450
Amortization of Unrealized Gains Related to Securities Transfer [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of AOCI [Abstract]
Interest income	91	109	187	223
Accumulated Defined Benefit Plans Adjustment [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of AOCI [Abstract]
Income tax (benefit)	(363)	(162)	(476)	(325)
Net income	1,088	487	1,427	973
Amortization of Net Losses [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of AOCI [Abstract]
Other noninterest expense	1,454	640	1,908	1,280
Amortization of Prior Service Costs [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of AOCI [Abstract]
Other noninterest expense	$ (3)	$ 9	$ (5)	$ 18

Fair Value Measurements and Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2024

Fair Value Measurements and Fair Value of Financial Instruments [Abstract]

Fair Value Measurements and Fair Value of Financial Instruments

12.	Fair Value Measurements and Fair Value of Financial Instruments

GAAP states that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value measurements are not adjusted for transaction costs. A fair value hierarchy exists within GAAP that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below:

Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;

Level 2 - Quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; and

Level 3 - Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity).

A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.

The types of instruments valued based on quoted market prices in active markets include most U.S. government and agency securities, many other sovereign government obligations, liquid mortgage products, active listed equities and most money market securities. Such instruments are generally classified within Level 1 or Level 2 of the fair value hierarchy. The Company does not adjust the quoted prices for such instruments.

The types of instruments valued based on quoted prices in markets that are not active, broker or dealer quotations or quote from alternative pricing sources with reasonable levels of price transparency include most investment-grade and high-yield corporate bonds, less liquid mortgage products, less liquid agency securities, less liquid listed equities, state, municipal and provincial obligations and certain physical commodities. Such instruments are generally classified within Level 2 of the fair value hierarchy. Certain common equity securities are reported at fair value utilizing Level 1 inputs (exchange quoted prices). Other investment securities are reported at fair value utilizing Level 1 and Level 2 inputs. The prices for Level 2 instruments are obtained through an independent pricing service or dealer market participants with whom the Company has historically transacted both purchases and sales of investment securities. Prices obtained from these sources include prices derived from market quotations and matrix pricing. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. Management reviews the methodologies used by its third-party providers in pricing the securities.

Level 3 is for positions that are not traded in active markets or are subject to transfer restrictions. Valuations are adjusted to reflect illiquidity and/or non-transferability and such adjustments are generally based on available market evidence. In the absence of such evidence, management’s best estimate will be used. Management’s best estimate consists of both internal and external support on certain Level 3 investments. Subsequent to inception, management only changes Level 3 inputs and assumptions when corroborated by evidence such as transactions in similar instruments, completed or pending third-party transactions in the underlying investment or comparable entities, subsequent rounds of financing, recapitalizations and other transactions across the capital structure, offerings in the equity or debt markets and changes in financial ratios or cash flows.

The following tables set forth the Company’s financial assets and liabilities measured on a recurring basis that were accounted for at fair value. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:

(In thousands)	Level 1		Level 2		Level 3		June 30, 2024
Assets:
AFS securities:
U.S. treasury	$	135,310	$	-	$	-	$	135,310
Federal agency		-		214,326		-		214,326
State & municipal		-		86,002		-		86,002
Mortgage-backed		-		392,332		-		392,332
Collateralized mortgage obligations		-		569,488		-		569,488
Corporate		-		41,987		-		41,987
Total AFS securities	$	135,310	$	1,304,135	$	-	$	1,439,445
Equity securities		39,087		1,000		-		40,087
Derivatives		-		91,186		-		91,186
Total	$	174,397	$	1,396,321	$	-	$	1,570,718
Liabilities:
Derivatives	$	-	$	115,664	$	-	$	115,664
Total	$	-	$	115,664	$	-	$	115,664

(In thousands)	Level 1		Level 2		Level 3		December 31, 2023
Assets:
AFS securities:
U.S. treasury	$	125,024	$	-	$	-	$	125,024
Federal agency		-		214,740		-		214,740
State & municipal		-		86,306		-		86,306
Mortgage-backed		-		422,268		-		422,268
Collateralized mortgage obligations		-		541,544		-		541,544
Corporate		-		40,976		-		40,976
Total AFS securities	$	125,024	$	1,305,834	$	-	$	1,430,858
Equity securities		36,591		1,000		-		37,591
Derivatives		-		75,142		-		75,142
Total	$	161,615	$	1,381,976	$	-	$	1,543,591
Liabilities:
Derivatives	$	-	$	95,875	$	-	$	95,875
Total	$	-	$	95,875	$	-	$	95,875

GAAP requires disclosure of assets and liabilities measured and recorded at fair value on a non-recurring basis such as goodwill, loans held for sale, other real estate owned, collateral-dependent loans individually evaluated for expected credit losses and HTM securities. Loans with fair value of $1.7 million as of June 30, 2024 were individually evaluated for expected credit losses where the amortized cost was adjusted to fair value. There were no loans individually evaluated for expected credit losses where the amortized cost was adjusted to fair value as of December 31, 2023. The Company uses the fair value of underlying collateral, less costs to sell, to estimate the allowance for credit losses for individually evaluated collateral dependent loans. The appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses ranging from 10% to 50%. Based on the valuation techniques used, the fair value measurements for collateral dependent individually evaluated loans are classified as Level 3.

The following table sets forth information with regard to estimated fair values of financial instruments. This table excludes financial instruments for which the carrying amount approximates fair value. Financial instruments for which the fair value approximates carrying value include cash and cash equivalents, AFS securities, equity securities, accrued interest receivable, non-maturity deposits, short-term borrowings, accrued interest payable and derivatives.

			June 30, 2024				December 31, 2023
(In thousands)	Fair Value Hierarchy		Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
HTM securities		2	$	878,909	$	780,490	$	905,267	$	814,524
Net loans		3		9,737,030		9,366,639		9,539,684		9,216,162
Financial liabilities:
Time deposits		2	$	1,404,797	$	1,384,422	$	1,324,709	$	1,285,999
Long-term debt		2		29,721		29,531		29,796		29,416
Subordinated debt		1		120,880		113,768		120,380		113,757
Junior subordinated debt		2		101,196		103,563		101,196		102,337

Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

Fair value estimates are based on existing on and off-balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. For example, the Company has a substantial wealth operation that contributes net fee income annually. The wealth management operation is not considered a financial instrument and its value has not been incorporated into the fair value estimates. Other significant assets and liabilities include the benefits resulting from the low-cost funding of deposit liabilities as compared to the cost of borrowing funds in the market and premises and equipment. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimate of fair value.

HTM Securities

The fair value of the Company’s HTM securities is primarily measured using information from a third-party pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things.

Net Loans

Net loans include portfolio loans and loans held for sale. Loans were first segregated by type and then further segmented into fixed and variable rate and loan quality categories. Expected future cash flows were projected based on contractual cash flows, adjusted for estimated prepayments, and those expected future cash flows also includes credit risk, illiquidity risk and other market factors to calculate the exit price fair value in accordance with ASC 820.

Time Deposits

The fair value of time deposits was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. The fair values of the Company’s time deposit liabilities do not take into consideration the value of the Company’s long-term relationships with depositors, which may have significant value.

Long-Term Debt

The fair value of long-term debt was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments.

Subordinated Debt

The fair value of subordinated debt has been measured using the observable market price as of the period reported.

Junior Subordinated Debt

The fair value of junior subordinated debt has been estimated using a discounted cash flow analysis.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 107
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-107

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 940
-SubTopic 820
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478119/940-820-50-1

+ Details

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2024

Summary of Significant Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2.	Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited interim consolidated financial statements include the accounts of NBT Bancorp Inc. and its wholly-owned subsidiaries: the Bank, NBT Financial and NBT Holdings. In the opinion of management, the interim data includes all adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation of the results for the interim periods in accordance with GAAP and in accordance with the instructions to Quarterly Report on Form 10-Q and Article 10 of Regulation S-X as promulgated by the SEC. Accordingly, the consolidated financial statements do not include all of the information and notes necessary for complete financial statements in conformity with GAAP. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s 2023 Annual Report on Form 10-K. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other interim period. All material intercompany transactions have been eliminated in consolidation. Amounts previously reported in the consolidated financial statements are reclassified whenever necessary to conform to the current period presentation. The Company has evaluated subsequent events for potential recognition and/or disclosure, and there were none identified.

Use of Estimates in the Preparation of Financial Statements

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Actual results may differ from those estimates and such differences could be material to the financial statements.

Estimates associated with the allowance for credit losses, pension accounting, provision for income taxes, fair values of financial instruments and status of contingencies are particularly susceptible to material change in the near term.

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Jun. 30, 2024
Insider Trading Arrangements [Line Items]
Rule 10b5-1 Arrangement Adopted [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false

Consolidated Statements of Changes in Stockholders' Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Consolidated Statements of Changes in Stockholders' Equity (unaudited) [Abstract]
Cash dividends - per share (in dollars per share)	$ 0.32	$ 0.3	$ 0.64	$ 0.6
Purchase of treasury shares (in shares)	5,700	87,000	7,600	87,000
Net issuance of shares to employee benefit plans and other stock plans (in shares)	16,054	9,432	63,070	55,941

Allowance for Credit Losses and Credit Quality of Loans, Amortized Cost Basis of Loans Modified to Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Term Extension [Member]
Modified Loans Disaggregated by Class of Financing Receivable and Type of Concession Granted [Abstract]
Amortized cost	$ 184	$ 199	$ 478	$ 242
Extended Maturity and Interest Rate Reduction [Member]
Modified Loans Disaggregated by Class of Financing Receivable and Type of Concession Granted [Abstract]
Amortized cost	30	171	30	171
Residential [Member] \| Term Extension [Member]
Modified Loans Disaggregated by Class of Financing Receivable and Type of Concession Granted [Abstract]
Amortized cost	$ 184	$ 199	$ 478	$ 242
% of total class of financing receivables	0.007%	0.009%	0.018%	0.011%
Residential [Member] \| Extended Maturity and Interest Rate Reduction [Member]
Modified Loans Disaggregated by Class of Financing Receivable and Type of Concession Granted [Abstract]
Amortized cost	$ 30	$ 171	$ 30	$ 171
% of total class of financing receivables	0.001%	0.008%	0.001%	0.008%

Securities

6 Months Ended

Jun. 30, 2024

Securities [Abstract]

Securities

4.	Securities

The amortized cost, estimated fair value and unrealized gains (losses) of AFS securities are as follows:

(In thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
As of June 30, 2024
U.S. treasury	$	143,571	$	5	$	(8,266	)	$	135,310
Federal agency		248,366		-		(34,040	)		214,326
State & municipal		95,856		-		(9,854	)		86,002
Mortgage-backed:
Government-sponsored enterprises		375,011		1		(45,918	)		329,094
U.S. government agency securities		70,600		9		(7,371	)		63,238
Collateralized mortgage obligations:
Government-sponsored enterprises		477,441		71		(49,064	)		428,448
U.S. government agency securities		168,095		-		(27,055	)		141,040
Corporate		48,461		-		(6,474	)		41,987
Total AFS securities	$	1,627,401	$	86	$	(188,042	)	$	1,439,445
As of December 31, 2023
U.S. treasury	$	133,302	$	-	$	(8,278	)	$	125,024
Federal agency		248,384		-		(33,644	)		214,740
State & municipal		96,251		11		(9,956	)		86,306
Mortgage-backed:
Government-sponsored enterprises		399,532		7		(44,264	)		355,275
U.S. government agency securities		74,281		14		(7,302	)		66,993
Collateralized mortgage obligations:
Government-sponsored enterprises		452,715		15		(48,257	)		404,473
U.S. government agency securities		162,171		-		(25,100	)		137,071
Corporate		48,442		-		(7,466	)		40,976
Total AFS securities	$	1,615,078	$	47	$	(184,267	)	$	1,430,858

There was no allowance for credit losses on AFS securities as of June 30, 2024 and December 31, 2023.

During the three months ended June 30, 2024, there were no gains or losses reclassified out of AOCI and into earnings. During the three months ended June 30, 2023, there were $4.5 million of gross realized losses reclassified out of AOCI and into earnings. During the six months ended June 30, 2023, there were $4.5 million of gross realized losses reclassified out of AOCI and into earnings and the Company incurred a $5.0 million loss on the write-off of an AFS corporate debt security from a subordinated debt investment of a financial institution that failed. The $5.0 million loss was reclassified out of AOCI and into earnings in net securities gains (losses) in the unaudited interim consolidated statements of income. During the six months ended June 30, 2024, the Company sold the previously written-off security and recognized a gain of $2.3 million into earnings in net securities gains (losses) in the unaudited interim consolidated statements of income.

The amortized cost, estimated fair value and unrealized gains (losses) of HTM securities are as follows:

(In thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
As of June 30, 2024
Federal agency	$	100,000	$	-	$	(18,048	)	$	81,952
Mortgage-backed:
Government-sponsored enterprises		218,862		-		(34,162	)		184,700
U.S. government agency securities		16,733		1		(734	)		16,000
Collateralized mortgage obligations:
Government-sponsored enterprises		177,833		-		(13,515	)		164,318
U.S. government agency securities		62,490		-		(11,533	)		50,957
State & municipal		302,991		77		(20,505	)		282,563
Total HTM securities	$	878,909	$	78	$	(98,497	)	$	780,490
As of December 31, 2023
Federal agency	$	100,000	$	-	$	(17,784	)	$	82,216
Mortgage-backed:
Government-sponsored enterprises		228,720		-		(31,613	)		197,107
U.S. government agency securities		17,086		3		(566	)		16,523
Collateralized mortgage obligations:
Government-sponsored enterprises		187,457		57		(12,021	)		175,493
U.S. government agency securities		63,878		-		(10,908	)		52,970
State & municipal		308,126		211		(18,122	)		290,215
Total HTM securities	$	905,267	$	271	$	(91,014	)	$	814,524

At June 30, 2024 and December 31, 2023, all of the mortgage-backed HTM securities were comprised of U.S. government agency and government-sponsored enterprises securities.

The Company recorded no gains from calls on HTM securities for the three and six months ended June 30, 2024 and 2023.

AFS and HTM securities with amortized costs totaling $2.04 billion at June 30, 2024 and $2.03 billion at December 31, 2023, were pledged to secure public deposits and for other purposes required or permitted by law. Additionally, at June 30, 2024 and December 31, 2023, AFS and HTM securities with an amortized cost totaling $198.9 million and $177.2 million, respectively, were pledged as collateral for securities sold under repurchase agreements.

The following tables set forth information with regard to gains and (losses) on equity securities:

	Three Months Ended June 30,
(In thousands)	2024			2023
Net (losses) recognized on equity securities	$	(92	)	$	(191	)
Less: Net (losses) recognized on equity securities sold during the period		-			-
Unrealized (losses) recognized on equity securities still held	$	(92	)	$	(191	)

	Six Months Ended June 30,
(In thousands)	2024			2023
Net (losses) recognized on equity securities	$	(193	)	$	(189	)
Less: Net (losses) recognized on equity securities sold during the period		-			-
Unrealized (losses) recognized on equity securities still held	$	(193	)	$	(189	)

As of June 30, 2024 and December 31, 2023, the carrying value of equity securities without readily determinable fair values was $1.0 million. The Company performed a qualitative assessment to determine whether the investments were impaired and identified no credit concerns as of June 30, 2024 and 2023. There were no impairments, or downward or upward adjustments recognized for equity securities without readily determinable fair values during the three and six months ended June 30, 2024 and 2023.

The following table sets forth information with regard to contractual maturities of debt securities at June 30, 2024:

(In thousands)	Amortized Cost		Estimated Fair Value
AFS debt securities:
Within one year	$	56,084	$	55,606
From one to five years		579,028		521,402
From five to ten years		305,590		269,587
After ten years		686,699		592,850
Total AFS debt securities	$	1,627,401	$	1,439,445
HTM debt securities:
Within one year	$	102,069	$	101,871
From one to five years		120,724		114,731
From five to ten years		244,994		212,360
After ten years		411,122		351,528
Total HTM debt securities	$	878,909	$	780,490

Maturities of mortgage-backed, collateralized mortgage obligations and asset-backed securities are stated based on their estimated average lives. Actual maturities may differ from estimated average lives or contractual maturities because, in certain cases, borrowers have the right to call or prepay obligations with or without call or prepayment penalties.

Except for U.S. government securities and government-sponsored enterprises securities, there were no holdings, when taken in the aggregate, of any single issuer that exceeded 10% of consolidated stockholders’ equity at June 30, 2024 and December 31, 2023.

The following table sets forth information with regard to investment securities with unrealized losses, for which an allowance for credit losses has not been recorded, segregated according to the length of time the securities had been in a continuous unrealized loss position:

	Less Than 12 Months							12 Months or Longer							Total
(In thousands)	Fair Value		Unrealized Losses			Number of Positions		Fair Value		Unrealized Losses			Number of Positions		Fair Value		Unrealized Losses			Number of Positions
As of June 30, 2024
AFS securities:
U.S. treasury	$	4,976	$	(6	)		1	$	115,324	$	(8,260	)		7	$	120,300	$	(8,266	)		8
Federal agency		-		-			-		214,326		(34,040	)		16		214,326		(34,040	)		16
State & municipal		758		(7	)		1		85,244		(9,847	)		66		86,002		(9,854	)		67
Mortgage-backed		284		(3	)		6		391,446		(53,286	)		157		391,730		(53,289	)		163
Collateralized mortgage obligations		26,485		(118	)		3		510,558		(76,001	)		120		537,043		(76,119	)		123
Corporate		1,448		(22	)		1		40,539		(6,452	)		14		41,987		(6,474	)		15
Total securities with unrealized losses	$	33,951	$	(156	)		12	$	1,357,437	$	(187,886	)		380	$	1,391,388	$	(188,042	)		392
HTM securities:
Federal agency	$	-	$	-			-	$	81,952	$	(18,048	)		4	$	81,952	$	(18,048	)		4
Mortgage-backed		-		-			-		200,630		(34,896	)		34		200,630		(34,896	)		34
Collateralized mortgage obligation		7,822		(84	)		1		207,453		(24,964	)		52		215,275		(25,048	)		53
State & municipal		6,557		(83	)		6		178,192		(20,422	)		203		184,749		(20,505	)		209
Total securities with unrealized losses	$	14,379	$	(167	)		7	$	668,227	$	(98,330	)		293	$	682,606	$	(98,497	)		300

As of December 31, 2023
AFS securities:
U.S. treasury	$	-	$	-			-	$	125,024	$	(8,278	)		8	$	125,024	$	(8,278	)		8
Federal agency		-		-			-		214,740		(33,644	)		16		214,740		(33,644	)		16
State & municipal		-		-			-		85,528		(9,956	)		66		85,528		(9,956	)		66
Mortgage-backed		53		(1	)		7		421,259		(51,565	)		156		421,312		(51,566	)		163
Collateralized mortgage obligations		1,333		(6	)		2		536,678		(73,351	)		118		538,011		(73,357	)		120
Corporate		1,379		(75	)		1		39,597		(7,391	)		14		40,976		(7,466	)		15
Total securities with unrealized losses	$	2,765	$	(82	)		10	$	1,422,826	$	(184,185	)		378	$	1,425,591	$	(184,267	)		388
HTM securities:
Federal agency	$	-	$	-			-	$	82,216	$	(17,784	)		4	$	82,216	$	(17,784	)		4
Mortgage-backed		12,221		(365	)		1		201,320		(31,814	)		33		213,541		(32,179	)		34
Collateralized mortgage obligations		-		-			-		219,820		(22,929	)		54		219,820		(22,929	)		54
State & municipal		14,422		(127	)		21		171,904		(17,995	)		189		186,326		(18,122	)		210
Total securities with unrealized losses	$	26,643	$	(492	)		22	$	675,260	$	(90,522	)		280	$	701,903	$	(91,014	)		302

The Company does not believe the AFS securities that were in an unrealized loss position as of June 30, 2024 and December 31, 2023, which consisted of 392 and 388 individual securities, respectively, represented a credit loss impairment. AFS debt securities in unrealized loss positions are evaluated for impairment related to credit losses at least quarterly. As of June 30, 2024 and December 31, 2023, the majority of the AFS securities in an unrealized loss position consisted of debt securities issued by U.S. government agencies or U.S. government-sponsored enterprises that carry the explicit and/or implicit guarantee of the U.S. government, which are widely recognized as “risk- free” and have a long history of zero credit losses. Total gross unrealized losses were primarily attributable to changes in interest rates, relative to when the investment securities were purchased, and not due to the credit quality of the investment securities. The Company does not intend to sell, nor is it more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, which may be at maturity. The Company elected to exclude AIR from the amortized cost basis of debt securities. AIR on AFS debt securities totaled $4.0 million at June 30, 2024 and $3.9 million at December 31, 2023, and is excluded from the estimate of credit losses and reported in the other assets financial statement line.

None of the Bank’s HTM debt securities were past due or on nonaccrual status as of June 30, 2024 and December 31, 2023. There was no accrued interest reversed against interest income for the three and six months ended June 30, 2024 or the year ended December 31, 2023 as all securities remained in accrual status. In addition, there were no collateral-dependent HTM debt securities as of June 30, 2024 and December 31, 2023. There was no allowance for credit losses on HTM securities as of June 30, 2024 and December 31, 2023. As of June 30, 2024 and December 31, 2023, 66% of the Company’s HTM debt securities were issued by U.S. government agencies or U.S. government-sponsored enterprises. These securities carry the explicit and/or implicit guarantee of the U.S. government, which are widely recognized as “risk-free,” and have a long history of zero credit losses. Therefore, the Company did not record an allowance for credit losses for these securities as of June 30, 2024 and December 31, 2023. The remaining HTM debt securities at June 30, 2024 and December 31, 2023 were comprised of state and municipal obligations with bond ratings of A to AAA. Utilizing the CECL methodology , the Company determined that the expected credit loss on its HTM municipal bond portfolio was immaterial and therefore no allowance for credit loss was recorded as of June 30, 2024 and December 31, 2023. AIR on HTM debt securities totaled $4.2 million at June 30, 2024 and $4.7 million at December 31, 2023 and is excluded from the estimate of credit losses and reported in the other assets financial statement line.

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Basic EPS [Abstract]
Weighted average common shares outstanding (in shares)	47,158	42,905	47,153	42,900
Net income available to common stockholders	$ 32,716	$ 30,072	$ 66,539	$ 63,730
Basic EPS (in dollars per share)	$ 0.69	$ 0.7	$ 1.41	$ 1.49
Diluted EPS [Abstract]
Weighted average common shares outstanding (in shares)	47,158	42,905	47,153	42,900
Dilutive effect of common stock options and restricted stock (in shares)	225	221	228	229
Weighted average common shares and common share equivalents (in shares)	47,383	43,126	47,381	43,129
Net income available to common stockholders	$ 32,716	$ 30,072	$ 66,539	$ 63,730
Diluted EPS (in dollars per share)	$ 0.69	$ 0.7	$ 1.4	$ 1.48
Anti-dilutive stock options and restricted stock outstanding (in shares)	2	61	2	24

Allowance for Credit Losses and Credit Quality of Loans, Summary (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
	Aug. 11, 2023	Jun. 30, 2024	Dec. 31, 2023	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Allowance for Credit Losses [Abstract]
Allowance for credit losses		$ 120,500	$ 114,400	$ 115,300	$ 100,400	$ 100,250
Percentage of allowance of credit losses		1.22%	1.19%
Forecast scenario weighting, baseline		80.00%		70.00%
Forecast scenario weighting, downside		20.00%		30.00%
Salisbury Bank [Member]
Allowance for Credit Losses [Abstract]
Loans purchased with credit deterioration		$ 0	$ 219,500
Allowance for credit losses on loans purchased			5,800
Allowance for credit losses at acquisition	$ 14,500
Salisbury Bank [Member] \| PCD [Member]
Allowance for Credit Losses [Abstract]
Allowance for credit losses at acquisition	5,800
Salisbury Bank [Member] \| Non-PCD [Member]
Allowance for Credit Losses [Abstract]
Allowance for credit losses at acquisition	$ 8,800
ASU 2022-02 [Member]
Allowance for Credit Losses [Abstract]
Allowance for credit losses					100,400		$ 100,152
Loans [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member] \| ASU 2022-02 [Member]
Allowance for Credit Losses [Abstract]
Allowance for credit losses							(600)
Accrued Interest Receivable [Member]
Allowance for Credit Losses [Abstract]
Allowance for credit losses		0	0
AIR on loans		$ 36,000	$ 34,100
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]		Other Assets	Other Assets
Residential [Member]
Allowance for Credit Losses [Abstract]
Allowance for credit losses		$ 25,874	$ 22,070	$ 23,409	15,554	$ 15,390
Amount of loans purchased		$ 400	$ 3,800
Premium on loans purchased		7.00%	7.00%
Allowance for credit losses on loans purchased		$ 4	$ 31
Residential [Member] \| ASU 2022-02 [Member]
Allowance for Credit Losses [Abstract]
Allowance for credit losses					$ 15,554		$ 14,539

Derivative Instruments and Hedging Activities (Details) - Derivatives Not Designated as Hedging Instruments [Member]
$ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2024

USD ($)

Agreement

Jun. 30, 2023

USD ($)

Jun. 30, 2024

USD ($)

Agreement

Jun. 30, 2023

USD ($)

Dec. 31, 2023

USD ($)

Agreement

Derivative Asset [Abstract]

Derivatives, fair value

$ 115,727

$ 95,991

Netting adjustments, fair value

^[1]

24,541

20,849

Net derivatives in the balance sheet, fair value

91,186

75,142

Derivatives not offset on the balance sheet, fair value

2,519

2,930

Cash collateral, fair value

^[2]

Net derivative amounts, fair value

88,667

72,212

Derivative Liability [Abstract]

Derivatives, fair value

115,664

95,875

Netting adjustments, fair value

^[1]

Net derivatives in the balance sheet, fair value

115,664

95,875

Derivatives not offset on the balance sheet, fair value

2,519

2,930

Cash collateral, fair value

^[2]

Net derivative amounts, fair value

113,145

$ 92,945

Other Income [Member]

Gain or loss recognized in income on derivatives not designating as a hedging relationship [Abstract]

Increase (decrease) in other income

$ 11

$ (7)

$ 86

$ 0

Interest Rate Swaps [Member]

Interest rate derivatives [Abstract]

Number of risk participation agreements held | Agreement

Interest Rate Swaps [Member] | Other Assets [Member]

Derivative Asset [Abstract]

Derivatives, notional amount

$ 1,402,621

$ 1,303,711

Derivatives, fair value

115,638

95,972

Interest Rate Swaps [Member] | Other Liabilities [Member]

Derivative Liability [Abstract]

Derivatives, notional amount

1,402,621

1,303,711

Derivatives, fair value

115,662

95,869

Risk Participation Agreements [Member] | Other Assets [Member]

Derivative Asset [Abstract]

Derivatives, notional amount

91,453

62,112

Derivatives, fair value

Risk Participation Agreements [Member] | Other Liabilities [Member]

Derivative Liability [Abstract]

Derivatives, notional amount

14,994

16,146

Derivatives, fair value

$ 2

$ 6

[1]

Netting adjustments represents the amounts recorded to convert derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance on the settle to market rules for cleared derivatives. The CME legally characterizes the variation margin posted between counterparties as settlements of the outstanding derivative contracts instead of cash collateral.

[2]

Cash collateral represents the amount that cannot be used to offset our derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. The other collateral consists of securities and is exchanged under bilateral collateral and master netting agreements that allow us to offset the net derivative position with the related collateral. The application of the other collateral cannot reduce the net derivative position below zero. Therefore, excess other collateral, if any, is not reflected above.

Allowance for Credit Losses and Credit Quality of Loans

6 Months Ended

Jun. 30, 2024

Allowance for Credit Losses and Credit Quality of Loans [Abstract]

Allowance for Credit Losses and Credit Quality of Loans

6.	Allowance for Credit Losses and Credit Quality of Loans

The allowance for credit losses totaled $120.5 million at June 30, 2024, compared to $114.4 million at December 31, 2023. The allowance for credit losses as a percentage of loans was 1.22% at June 30, 2024, compared to 1.19% at December 31, 2023.

The allowance for credit losses calculation incorporated a 6-quarter forecast period to account for forecast economic conditions under each scenario utilized in the measurement. For periods beyond the 6-quarter forecast, the model reverts to long-term economic conditions over a 4-quarter reversion period on a straight-line basis. The Company considers a baseline, upside and downside economic forecast in measuring the allowance.

The quantitative model as of June 30, 2024 incorporated a baseline economic outlook along with an alternative downside scenario sourced from a reputable third-party to accommodate other potential economic conditions in the model. At June 30, 2024, the weightings were 80% and 20% for the baseline and downside economic forecasts, respectively. The baseline outlook reflects an economic environment where the Northeast unemployment rate increases slightly from 4.0% to 4.1% during the forecast period. Northeast GDP’s annualized growth (on a quarterly basis) is expected to start the third quarter of 2024 at approximately 3.7% and increase slightly to 3.8% before the end of the forecast period. Key assumptions in the baseline economic outlook included the Federal Reserve cutting rates with two 25 basis point cuts at the September and December meetings, the economy remaining at full employment, and continued tapering of the Federal Reserve balance sheet. The alternative downside scenario assumed deteriorated economic conditions from the baseline outlook. Under this scenario, Northeast unemployment rises from 4.0% in the second quarter of 2024 to a peak of 7.2% in the fourth quarter of 2025. These scenarios and their respective weightings are evaluated at each measurement date and reflect management’s expectations as of June 30, 2024. Additional adjustments were made for factors not incorporated in the forecasts or the model, such as loss rate expectations for certain loan pools, considerations for inflation, and recent trends in asset value indices. Additional monitoring for industry concentrations, loan growth, and policy exceptions was also conducted.

The methodology for prepayment assumptions was revised during the second quarter of 2024 from a static, current rate experience approach to one that includes both current experience and long-term average behavior. The change to the methodology increased the allowance for loan losses by approximately 3% as of June 30, 2024. The longer-average effective life portfolios such as the residential mortgage and residential solar segments experienced a greater impact resulting from the change in methodology. The change in prepayment methodology provided an improved estimate of expected prepayments, particularly for the longer-lived portfolios.

The quantitative model as of March 31, 2024 incorporated a baseline economic outlook along with an alternative downside scenario sourced from a reputable third-party to accommodate other potential economic conditions in the model. At March 31, 2024, the weightings were 70% and 30% for the baseline and downside economic forecasts, respectively. The baseline outlook reflected an economic environment where the unemployment rate increases slightly from 3.8% to 4.1% during the forecast period. Northeast GDP’s annualized growth (on a quarterly basis) was expected to start the second quarter of 2024 at approximately 3.3% and decrease to 2.8% before increasing to 3.4% by the end of the forecast period. Key assumptions in the baseline economic outlook included the Federal Reserve cutting rates with three 25 basis point cuts at the June, September, and December meetings, the economy remaining at full employment, and continued tapering of the Federal Reserve balance sheet. The alternative downside scenario assumed deteriorated economic conditions from the baseline outlook. Under this scenario, national unemployment rises from 3.8% in the first quarter of 2024 to a peak of 7.7% in the second quarter of 2025. These scenarios and their respective weightings are evaluated at each measurement date and reflect management’s expectations as of March 31, 2024. Additional adjustments were made for factors not incorporated in the forecasts or the model, such as loss rate expectations for certain loan pools, considerations for inflation, and recent trends in asset value indices. Additional monitoring for industry concentrations, loan growth, and policy exceptions was also conducted.

The quantitative model as of December 31, 2023 incorporated a baseline economic outlook along with an alternative downside scenario sourced from a reputable third-party to accommodate other potential economic conditions in the model. At December 31, 2023, the weightings were 70% and 30% for the baseline and downside economic forecasts, respectively. The baseline outlook reflected an unemployment rate environment starting at 3.8% and increasing slightly during the forecast period to 4.1%. Northeast GDP’s annualized growth (on a quarterly basis) was expected to start the first quarter of 2024 at approximately 3.7% before decreasing to a low of 2.9% in the third quarter of 2024 and then increasing to 3.8% by the end of the forecast period. Other utilized economic variable forecasts are mixed compared to the prior year, with retail sales improving, business output mixed and housing starts down. Key assumptions in the baseline economic outlook included currently being in a full employment economy, continued tapering of the Federal Reserve balance sheet and the FOMC beginning to cut rates in the second quarter of 2024. The alternative downside scenario assumed deteriorated economic conditions from the baseline outlook. Under this scenario, Northeast unemployment increases to a peak of 7.0% in the first quarter of 2025. These scenarios and their respective weightings are evaluated at each measurement date and reflect management’s expectations as of December 31, 2023. Additional qualitative adjustments were made for factors not incorporated in the forecasts or the model, such as loss rate expectations for certain loan pools, considerations for inflation and recent trends in asset value indices. Additional monitoring for industry concentrations, loan growth and policy exceptions was also conducted.

There were no loans purchased with credit deterioration during the six months ended June 30, 2024. There were $219.5 million of PCD loans acquired from Salisbury during the year ended December 31, 2023, which resulted in an allowance for credit losses at acquisition of $5.8 million. During the six months ended June 30, 2024, the Company purchased $0.4 million of residential loans at a 7.0% premium with a $4 thousand allowance for credit losses recorded for these loans. During 2023, the Company purchased $3.8 million of residential loans at a 7.0% premium with a $31 thousand allowance for credit losses recorded for these loans.

The Company made a policy election to report AIR in the other assets line item on the consolidated balance sheets. AIR on loans totaled $36.0 million at June 30, 2024 and $34.1 million at December 31, 2023 and there was no estimated allowance for credit losses related to AIR as of June 30, 2024 and December 31, 2023 as it is excluded from amortized cost.

The Company’s January 1, 2023 adoption of ASU 2022-02, Financial Instruments - CECL Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures resulted in an insignificant change to its methodology for estimating the allowance for credit losses on TDRs. The ASU eliminated the guidance on TDRs and requires an evaluation on all loan modifications to determine if they result in a new loan or a continuation of the existing loan. The decrease in allowance for credit loss on TDR loans relating to adoption of ASU 2022-02 was $0.6 million.

The following tables present the activity in the allowance for credit losses by our portfolio segments:

(In thousands)	Commercial Loans			Consumer Loans			Residential			Total
Balance as of March 31, 2024	$	44,472		$	47,419		$	23,409		$	115,300
Charge-offs		(299	)		(5,328	)		-			(5,627	)
Recoveries		292			1,559			77			1,928
Provision		2,243			4,268			2,388			8,899
Ending balance as of June 30, 2024	$	46,708		$	47,918		$	25,874		$	120,500

Balance as of March 31, 2023	$	36,040		$	48,820		$	15,390		$	100,250
Charge-offs		(207	)		(4,837	)		(105	)		(5,149	)
Recoveries		97			1,441			155			1,693
Provision		1,033			2,459			114			3,606
Ending balance as of June 30, 2023	$	36,963		$	47,883		$	15,554		$	100,400

(In thousands)	Commercial Loans			Consumer Loans			Residential			Total
Balance as of December 31, 2023	$	45,903		$	46,427		$	22,070		$	114,400
Charge-offs		(1,284	)		(10,909	)		(114	)		(12,307	)
Recoveries		490			3,210			229			3,929
Provision		1,599			9,190			3,689			14,478
Ending balance as of June 30, 2024	$	46,708		$	47,918		$	25,874		$	120,500

Balance as of January 1, 2023 (after adoption of ASU 2022-02)	$	34,662		$	50,951		$	14,539		$	100,152
Charge-offs		(376	)		(10,179	)		(444	)		(10,999	)
Recoveries		638			2,818			276			3,732
Provision		2,039			4,293			1,183			7,515
Ending balance as of June 30, 2023	$	36,963		$	47,883		$	15,554		$	100,400

The allowance for credit losses as of June 30, 2024 increased compared to the allowance estimates as of December 31, 2023 and March 31, 2024 primarily due to providing for the second quarter’s loan growth, the slowing of prepayment speed assumptions, including the changes in prepayment model assumptions and an additional specific reserve established relating to a commercial relationship individually evaluated for credit loss, partly offset by a change in forecast scenario weightings from 70% baseline and 30% downside to 80% baseline and 20% downside. The increase in the allowance for credit losses from June 30, 2023 to June 30, 2024 was primarily due to providing for loan growth, slowing of prepayment speed assumptions and the recording of $14.5 million of allowance for acquired Salisbury loans as of the acquisition date, which included both the $8.8 million of non-PCD allowance recognized through the provision for loan losses and the $5.8 million of PCD allowance reclassified from loans.

Individually Evaluated Loans

The threshold for evaluating classified, commercial and commercial real estate loans risk graded substandard or doubtful, and nonperforming loans individually evaluated for credit loss is $1.0 million. As of June 30, 2024, there were two relationships identified to be evaluated for loss on an individual basis which had an amortized cost basis of $17.1 million, with $1.7 million of allowance for credit loss. As of December 31, 2023, the same two relationships were identified to be evaluated for loss on an individual basis which had an amortized cost basis of $17.3 million, with no allowance for credit loss. As of June 30, 2024 and December 31, 2023, there were $1.8 million and $17.3 million, respectively, of loans in nonaccrual status that were individually evaluated for expected credit loss without an allowance for credit losses.

The following table sets forth information with regard to past due and nonperforming loans by loan segment:

(In thousands)	31-60 Days Past Due Accruing		61-90 Days Past Due Accruing		Greater Than 90 Days Past Due Accruing		Total Past Due Accruing		Nonaccrual		Current		Recorded Total Loans
As of June 30, 2024
Commercial loans:
C&I	$	929	$	1,149	$	12	$	2,090	$	2,586	$	1,454,003	$	1,458,679
CRE		790		238		-		1,028		18,357		3,534,517		3,553,902
Total commercial loans	$	1,719	$	1,387	$	12	$	3,118	$	20,943	$	4,988,520	$	5,012,581
Consumer loans:
Auto	$	9,653	$	1,735	$	995	$	12,383	$	2,079	$	1,179,800	$	1,194,262
Residential solar		4,038		1,356		1,043		6,437		122		855,324		861,883
Other consumer		1,523		960		787		3,270		259		134,602		138,131
Total consumer loans	$	15,214	$	4,051	$	2,825	$	22,090	$	2,460	$	2,169,726	$	2,194,276
Residential	$	3,312	$	903	$	496	$	4,711	$	11,352	$	2,631,427	$	2,647,490
Total loans	$	20,245	$	6,341	$	3,333	$	29,919	$	34,755	$	9,789,673	$	9,854,347

(In thousands)	31-60 Days Past Due Accruing		61-90 Days Past Due Accruing		Greater Than 90 Days Past Due Accruing		Total Past Due Accruing		Nonaccrual		Current		Recorded Total Loans
As of December 31, 2023
Commercial loans:
C&I	$	414	$	33	$	1	$	448	$	3,441	$	1,393,616	$	1,397,505
CRE		803		835		-		1,638		18,126		3,413,984		3,433,748
Total commercial loans	$	1,217	$	868	$	1	$	2,086	$	21,567	$	4,807,600	$	4,831,253
Consumer loans:
Auto	$	10,115	$	2,011	$	1,067	$	13,193	$	2,106	$	1,084,143	$	1,099,442
Residential solar		3,074		1,301		915		5,290		245		912,220		917,755
Other consumer		2,343		1,811		1,124		5,278		215		164,867		170,360
Total consumer loans	$	15,532	$	5,123	$	3,106	$	23,761	$	2,566	$	2,161,230	$	2,187,557
Residential	$	3,836	$	399	$	554	$	4,789	$	10,080	$	2,617,034	$	2,631,903
Total loans	$	20,585	$	6,390	$	3,661	$	30,636	$	34,213	$	9,585,864	$	9,650,713

Credit Quality Indicators

The Company has developed an internal loan grading system to evaluate and quantify the Company’s loan portfolio with respect to quality and risk. The system focuses on, among other things, financial strength of borrowers, experience and depth of borrower’s management, primary and secondary sources of repayment, payment history, nature of the business and outlook on particular industries. The internal grading system enables the Company to monitor the quality of the entire loan portfolio on a consistent basis and provide management with an early warning system, which facilitates recognition and response to problem loans and potential problem loans.

Commercial Grading System

For C&I and CRE loans, the Company uses a grading system that relies on quantifiable and measurable characteristics when available. This includes comparison of financial strength to available industry averages, comparison of transaction factors (loan terms and conditions) to loan policy and comparison of credit history to stated repayment terms and industry averages. Some grading factors are necessarily more subjective such as economic and industry factors, regulatory environment and management. C&I and CRE loans are graded Doubtful, Substandard, Special Mention and Pass.

Doubtful

A Doubtful loan has a high probability of total or substantial loss, but because of specific pending events that may strengthen the asset, its classification as a loss is deferred. Doubtful borrowers are usually in default, lack adequate liquidity or capital and lack the resources necessary to remain an operating entity. Pending events can include mergers, acquisitions, liquidations, capital injections, the perfection of liens on additional collateral, the valuation of collateral and refinancing. Generally, pending events should be resolved within a relatively short period and the ratings will be adjusted based on the new information. Nonaccrual treatment is required for Doubtful assets because of the high probability of loss.

Substandard

Substandard loans have a high probability of payment default or they have other well-defined weaknesses. They require more intensive supervision by bank management. Substandard loans are generally characterized by current or expected unprofitable operations, inadequate debt service coverage, inadequate liquidity or marginal capitalization. Repayment may depend on collateral or other credit risk mitigants. For some Substandard loans, the likelihood of full collection of interest and principal may be in doubt and those loans should be placed on nonaccrual. Although Substandard assets in the aggregate will have a distinct potential for loss, an individual asset’s loss potential does not have to be distinct for the asset to be rated Substandard.

Special Mention

Special Mention loans have potential weaknesses that may, if not checked or corrected, weaken the asset or inadequately protect the Company’s position at some future date. These loans pose elevated risk, but their weakness does not yet justify a Substandard classification. Borrowers may be experiencing adverse operating trends (i.e., declining revenues or margins) or may be struggling with an ill-proportioned balance sheet (i.e., increasing inventory without an increase in sales, high leverage and/or tight liquidity). Adverse economic or market conditions, such as interest rate increases or the entry of a new competitor, may also support a Special Mention rating. Although a Special Mention loan has a higher probability of default than a Pass asset, its default is not imminent.

Pass

Loans graded as Pass encompass all loans not graded as Doubtful, Substandard or Special Mention. Pass loans are in compliance with loan covenants and payments are generally made as agreed. Pass loans range from superior quality to fair quality. Pass loans also include any portion of a government guaranteed loan, including Paycheck Protection Program loans.

Consumer and Residential Grading System

Consumer and Residential loans are graded as either Nonperforming or Performing.

Nonperforming

Nonperforming loans are loans that are (1) over 90 days past due and interest is still accruing or (2) on nonaccrual status.

Performing

All loans not meeting any of the above criteria are considered Performing.

The following tables illustrate the Company’s credit quality by loan class by vintage and includes gross charge-offs by loan class by vintage. Included in other consumer gross charge-offs for the six months ended June 30, 2024, the Company recorded $0.2 million in overdrawn deposit accounts reported as 2023 originations and $0.2 million in overdrawn deposit accounts reported as 2024 originations. Included in other consumer gross charge-offs for the year ended December 31, 2023, the Company recorded $0.2 million in overdrawn deposit accounts reported as 2022 originations and $0.8 million in overdrawn deposit accounts reported as 2023 originations.

(In thousands)	2024			2023			2022			2021			2020			Prior			Revolving Loans Amortized Cost Basis		Revolving Loans Converted to Term		Total
As of June 30, 2024
C&I
By internally assigned grade:
Pass	$	149,845		$	199,272		$	219,561		$	207,165		$	136,993		$	115,577		$	338,577	$	13,847	$	1,380,837
Special mention		557			4,909			5,531			434			4,003			1,892			25,194		370		42,890
Substandard		332			3,800			2,295			1,631			250			5,997			20,381		137		34,823
Doubtful		-			99			1			19			-			10			-		-		129
Total C&I	$	150,734		$	208,080		$	227,388		$	209,249		$	141,246		$	123,476		$	384,152	$	14,354	$	1,458,679
Current-period gross charge-offs	$	-		$	(58	)	$	(915	)	$	(4	)	$	-		$	(307	)	$	-	$	-	$	(1,284	)
CRE
By internally assigned grade:
Pass	$	231,892		$	358,866		$	492,938		$	523,952		$	432,230		$	975,497		$	311,534	$	54,559	$	3,381,468
Special mention		947			9,375			10,017			7,754			4,035			31,354			4,288		-		67,770
Substandard		-			2,163			18,890			17,926			3,290			61,121			1,274		-		104,664
Total CRE	$	232,839		$	370,404		$	521,845		$	549,632		$	439,555		$	1,067,972		$	317,096	$	54,559	$	3,553,902
Current-period gross charge-offs	$	-		$	-		$	-		$	-		$	-		$	-		$	-	$	-	$	-
Auto
By payment activity:
Performing	$	318,277		$	392,472		$	299,349		$	120,481		$	29,789		$	30,820		$	-	$	-	$	1,191,188
Nonperforming		151			1,004			847			732			158			182			-		-		3,074
Total auto	$	318,428		$	393,476		$	300,196		$	121,213		$	29,947		$	31,002		$	-	$	-	$	1,194,262
Current-period gross charge-offs	$	(21	)	$	(591	)	$	(913	)	$	(499	)	$	(35	)	$	(225	)	$	-	$	-	$	(2,284	)
Residential solar
By payment activity:
Performing	$	1,803		$	132,249		$	413,160		$	173,286		$	61,333		$	78,887		$	-	$	-	$	860,718
Nonperforming		-			123			742			160			60			80			-		-		1,165
Total residential solar	$	1,803		$	132,372		$	413,902		$	173,446		$	61,393		$	78,967		$	-	$	-	$	861,883
Current-period gross charge-offs	$	-		$	(143	)	$	(2,036	)	$	(251	)	$	(34	)	$	(492	)	$	-	$	-	$	(2,956	)
Other consumer
By payment activity:
Performing	$	10,904		$	9,020		$	18,664		$	39,443		$	15,264		$	21,743		$	22,044	$	3	$	137,085
Nonperforming		-			12			127			422			167			297			13		8		1,046
Total other consumer	$	10,904		$	9,032		$	18,791		$	39,865		$	15,431		$	22,040		$	22,057	$	11	$	138,131
Current-period gross charge-offs	$	(191	)	$	(270	)	$	(1,383	)	$	(2,749	)	$	(574	)	$	(502	)	$	-	$	-	$	(5,669	)
Residential
By payment activity:
Performing	$	86,396		$	250,760		$	335,011		$	442,457		$	258,291		$	989,436		$	253,709	$	19,582	$	2,635,642
Nonperforming		-			832			866			1,923			293			7,905			29		-		11,848
Total residential	$	86,396		$	251,592		$	335,877		$	444,380		$	258,584		$	997,341		$	253,738	$	19,582	$	2,647,490
Current-period gross charge-offs	$	-		$	-		$	-		$	-		$	-		$	(114	)	$	-	$	-	$	(114	)
Total loans	$	801,104		$	1,364,956		$	1,817,999		$	1,537,785		$	946,156		$	2,320,798		$	977,043	$	88,506	$	9,854,347
Current-period gross charge-offs	$	(212	)	$	(1,062	)	$	(5,247	)	$	(3,503	)	$	(643	)	$	(1,640	)	$	-	$	-	$	(12,307	)

(In thousands)	2023			2022			2021			2020			2019			Prior			Revolving Loans Amortized Cost Basis		Revolving Loans Converted to Term		Total
As of December 31, 2023
C&I
By internally assigned grade:
Pass	$	229,249		$	270,796		$	241,993		$	158,051		$	74,469		$	63,826		$	299,248	$	2,923	$	1,340,555
Special mention		420			1,672			277			3,524			87			1,854			19,489		-		27,323
Substandard		1,496			2,461			1,609			282			2,266			5,632			14,266		1,607		29,619
Doubtful		-			1			2			-			4			1			-		-		8
Total C&I	$	231,165		$	274,930		$	243,881		$	161,857		$	76,826		$	71,313		$	333,003	$	4,530	$	1,397,505
Current-period gross charge-offs	$	(24	)	$	(3,021	)	$	(5	)	$	(86	)	$	-		$	(600	)	$	-	$	-	$	(3,736	)
CRE
By internally assigned grade:
Pass	$	353,161		$	518,201		$	561,897		$	452,110		$	327,804		$	739,189		$	294,039	$	33,705	$	3,280,106
Special mention		3,577			4,472			10,711			7,055			9,967			39,460			2,970		-		78,212
Substandard		370			731			21,807			1,146			2,996			37,418			10,962		-		75,430
Total CRE	$	357,108		$	523,404		$	594,415		$	460,311		$	340,767		$	816,067		$	307,971	$	33,705	$	3,433,748
Current-period gross charge-offs	$	-		$	-		$	-		$	-		$	(114	)	$	(304	)	$	-	$	-	$	(418	)
Auto
By payment activity:
Performing	$	474,369		$	363,516		$	157,251		$	42,644		$	45,406		$	13,071		$	12	$	-	$	1,096,269
Nonperforming		532			1,241			830			190			306			74			-		-		3,173
Total auto	$	474,901		$	364,757		$	158,081		$	42,834		$	45,712		$	13,145		$	12	$	-	$	1,099,442
Current-period gross charge-offs	$	(102	)	$	(1,183	)	$	(1,066	)	$	(340	)	$	(301	)	$	(295	)	$	-	$	-	$	(3,287	)
Residential solar
By payment activity:
Performing	$	155,425		$	430,855		$	178,839		$	65,382		$	46,554		$	39,540		$	-	$	-	$	916,595
Nonperforming		-			837			205			18			47			53			-		-		1,160
Total residential solar	$	155,425		$	431,692		$	179,044		$	65,400		$	46,601		$	39,593		$	-	$	-	$	917,755
Current-period gross charge-offs	$	(150	)	$	(1,930	)	$	(923	)	$	(45	)	$	(558	)	$	(345	)	$	-	$	-	$	(3,951	)
Other consumer
By payment activity:
Performing	$	13,089		$	27,394		$	57,876		$	21,087		$	14,548		$	15,964		$	19,042	$	21	$	169,021
Nonperforming		-			244			685			144			56			161			4		45		1,339
Total other consumer	$	13,089		$	27,638		$	58,561		$	21,231		$	14,604		$	16,125		$	19,046	$	66	$	170,360
Current-period gross charge-offs	$	(885	)	$	(3,744	)	$	(7,511	)	$	(1,329	)	$	(832	)	$	(568	)	$	-	$	-	$	(14,869	)
Residential
By payment activity:
Performing	$	212,799		$	366,860		$	453,206		$	267,845		$	167,860		$	876,563		$	260,836	$	15,300	$	2,621,269
Nonperforming		134			430			1,121			385			591			7,460			-		513		10,634
Total residential	$	212,933		$	367,290		$	454,327		$	268,230		$	168,451		$	884,023		$	260,836	$	15,813	$	2,631,903
Current-period gross charge-offs	$	-		$	-		$	(81	)	$	(30	)	$	-		$	(406	)	$	-	$	-	$	(517	)
Total loans	$	1,444,621		$	1,989,711		$	1,688,309		$	1,019,863		$	692,961		$	1,840,266		$	920,868	$	54,114	$	9,650,713
Current-period gross charge-offs	$	(1,161	)	$	(9,878	)	$	(9,586	)	$	(1,830	)	$	(1,805	)	$	(2,518	)	$	-	$	-	$	(26,778	)

Allowance for Credit Losses on Off-Balance Sheet Credit Exposures

The allowance for losses on unfunded commitments totaled $4.3 million as of June 30, 2024, compared to $5.1 million as of December 31, 2023.

Loan Modifications to Borrowers Experiencing Financial Difficulties

When the Company modifies a loan with financial difficulty, such modifications generally include one or a combination of the following: an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; a change in scheduled payment amount; or principal forgiveness.

The following table shows the amortized cost basis at the end of the reporting period of the loans modified to borrowers experiencing financial difficulty, disaggregated by class of financing receivable and type of concession granted:

	Three Months Ended June 30, 2024
	Term Extension						Combination - Term Extension and Interest Rate Reduction
(Dollars in thousands)	Amortized Cost			% of Total Class of Financing Receivables			Amortized Cost			% of Total Class of Financing Receivables
Residential		$	184		0.007	%		$	30		0.001	%
Total		$	184					$	30

	Three Months Ended June 30, 2023
	Term Extension						Combination - Term Extension and Interest Rate Reduction
(Dollars in thousands)	Amortized Cost			% of Total Class of Financing Receivables			Amortized Cost			% of Total Class of Financing Receivables
Residential		$	199		0.009	%		$	171		0.008	%
Total		$	199					$	171

	Six Months Ended June 30, 2024
	Term Extension						Combination - Term Extension and Interest Rate Reduction
(Dollars in thousands)	Amortized Cost			% of Total Class of Financing Receivables			Amortized Cost			% of Total Class of Financing Receivables
Residential		$	478		0.018	%		$	30		0.001	%
Total		$	478					$	30

	Six Months Ended June 30, 2023
	Term Extension						Combination - Term Extension and Interest Rate Reduction
(Dollars in thousands)	Amortized Cost			% of Total Class of Financing Receivables			Amortized Cost			% of Total Class of Financing Receivables
Residential		$	242		0.011	%		$	171		0.008	%
Total		$	242					$	171

The following table describes the financial effect of the modifications made to borrowers experiencing financial difficulties:

	Three Months Ended June 30, 2024
Loan Type	Term Extension	Interest Rate Reduction
Residential	Added a weighted-average 5.3 years to the life of loans, which reduced monthly payment amounts for the borrowers	Interest Rates were reduced by an average of one percent

	Three Months Ended June 30, 2023
Loan Type	Term Extension	Interest Rate Reduction
Residential	Added a weighted-average 10 years to the life of loans, which reduced monthly payment amounts for the borrowers	Interest Rates were reduced by an average of three and a half percent

	Six Months Ended June 30, 2024
Loan Type	Term Extension	Interest Rate Reduction
Residential	Added a weighted-average 6.3 years to the life of loans, which reduced monthly payment amounts for the borrowers	Interest Rates were reduced by an average of one percent

	Six Months Ended June 30, 2023
Loan Type	Term Extension	Interest Rate Reduction
Residential	Added a weighted-average 14 years to the life of loans, which reduced monthly payment amounts for the borrowers	Interest Rates were reduced by an average of three and a half percent

The following table depicts the financing receivables that had a payment default that were modified to borrowers experiencing financial difficulty in the previous 12 months:

	Three and Six Months Ended
	June 30, 2024
(In thousands)	Amortized Cost Basis of Modified Financing Receivables that Subsequently Defaulted
(In thousands)	Term Extension
Residential		$	171
Total		$	171

There were no financing receivables that had a payment default during the three and six months ended June 30, 2023, that were modified to borrowers experiencing financial difficulty that were modified in the twelve months prior to that default.

The following table depicts the performance of loans that have been modified to borrowers experiencing financial difficulty that were modified in the prior twelve months:

	Payment Status (Amortized Cost Basis)
(In thousands)	Current		31-60 Days Past Due		61-90 Days Past Due		Greater than 90 Days Past Due
As of June 30, 2024
Residential	$	567	$	120	$	-	$	78
Total	$	567	$	120	$	-	$	78

Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2024	Jul. 31, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Document Transition Report	false
Entity File Number	0-14703
Entity Registrant Name	NBT BANCORP INC
Entity Central Index Key	0000790359
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	16-1268674
Entity Address, Address Line One	52 South Broad Street
Entity Address, City or Town	Norwich
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	13815
City Area Code	607
Local Phone Number	337-2265
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	NBTB
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		47,171,305

Securities, AFS Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	Jun. 30, 2024 USD ($) Position	Dec. 31, 2023 USD ($) Position
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 33,951	$ 2,765
12 months or longer	1,357,437	1,422,826
Total	1,391,388	1,425,591
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(156)	(82)
12 months or longer	(187,886)	(184,185)
Total	$ (188,042)	$ (184,267)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months \| Position	12	10
12 months or longer \| Position	380	378
Total \| Position	392	388
AIR on AFS debt securities	$ 4,000	$ 3,900
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
U.S. Treasury [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 4,976	$ 0
12 months or longer	115,324	125,024
Total	120,300	125,024
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(6)	0
12 months or longer	(8,260)	(8,278)
Total	$ (8,266)	$ (8,278)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months \| Position	1	0
12 months or longer \| Position	7	8
Total \| Position	8	8
Federal Agency [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 0	$ 0
12 months or longer	214,326	214,740
Total	214,326	214,740
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	0	0
12 months or longer	(34,040)	(33,644)
Total	$ (34,040)	$ (33,644)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months \| Position	0	0
12 months or longer \| Position	16	16
Total \| Position	16	16
State & Municipal [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 758	$ 0
12 months or longer	85,244	85,528
Total	86,002	85,528
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(7)	0
12 months or longer	(9,847)	(9,956)
Total	$ (9,854)	$ (9,956)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months \| Position	1	0
12 months or longer \| Position	66	66
Total \| Position	67	66
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 284	$ 53
12 months or longer	391,446	421,259
Total	391,730	421,312
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(3)	(1)
12 months or longer	(53,286)	(51,565)
Total	$ (53,289)	$ (51,566)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months \| Position	6	7
12 months or longer \| Position	157	156
Total \| Position	163	163
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 26,485	$ 1,333
12 months or longer	510,558	536,678
Total	537,043	538,011
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(118)	(6)
12 months or longer	(76,001)	(73,351)
Total	$ (76,119)	$ (73,357)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months \| Position	3	2
12 months or longer \| Position	120	118
Total \| Position	123	120
Corporate [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 1,448	$ 1,379
12 months or longer	40,539	39,597
Total	41,987	40,976
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(22)	(75)
12 months or longer	(6,452)	(7,391)
Total	$ (6,474)	$ (7,466)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months \| Position	1	1
12 months or longer \| Position	14	14
Total \| Position	15	15

Allowance for Credit Losses and Credit Quality of Loans, Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Minimum number of days past due for loans to be considered nonperforming			90 days
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	$ 801,104		$ 801,104	$ 1,444,621
2023/2022	1,364,956		1,364,956	1,989,711
2022/2021	1,817,999		1,817,999	1,688,309
2021/2020	1,537,785		1,537,785	1,019,863
2020/2019	946,156		946,156	692,961
Prior	2,320,798		2,320,798	1,840,266
Revolving Loans Amortized Cost Basis	977,043		977,043	920,868
Revolving Loans Converted to Term	88,506		88,506	54,114
Total	9,854,347		9,854,347	9,650,713
Gross Charge-offs by Loan Class by Vintage [Abstract]
2024/2023			(212)	(1,161)
2023/2022			(1,062)	(9,878)
2022/2021			(5,247)	(9,586)
2021/2020			(3,503)	(1,830)
2020/2019			(643)	(1,805)
Prior			(1,640)	(2,518)
Revolving Loans Amortized Cost Basis			0	0
Revolving Loans Converted to Term			0	0
Total	(5,627)	$ (5,149)	(12,307)	(26,778)
C&I [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	150,734		150,734	231,165
2023/2022	208,080		208,080	274,930
2022/2021	227,388		227,388	243,881
2021/2020	209,249		209,249	161,857
2020/2019	141,246		141,246	76,826
Prior	123,476		123,476	71,313
Revolving Loans Amortized Cost Basis	384,152		384,152	333,003
Revolving Loans Converted to Term	14,354		14,354	4,530
Total	1,458,679		1,458,679	1,397,505
Gross Charge-offs by Loan Class by Vintage [Abstract]
2024/2023			0	(24)
2023/2022			(58)	(3,021)
2022/2021			(915)	(5)
2021/2020			(4)	(86)
2020/2019			0	0
Prior			(307)	(600)
Revolving Loans Amortized Cost Basis			0	0
Revolving Loans Converted to Term			0	0
Total			(1,284)	(3,736)
C&I [Member] \| Pass [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	149,845		149,845	229,249
2023/2022	199,272		199,272	270,796
2022/2021	219,561		219,561	241,993
2021/2020	207,165		207,165	158,051
2020/2019	136,993		136,993	74,469
Prior	115,577		115,577	63,826
Revolving Loans Amortized Cost Basis	338,577		338,577	299,248
Revolving Loans Converted to Term	13,847		13,847	2,923
Total	1,380,837		1,380,837	1,340,555
C&I [Member] \| Special Mention [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	557		557	420
2023/2022	4,909		4,909	1,672
2022/2021	5,531		5,531	277
2021/2020	434		434	3,524
2020/2019	4,003		4,003	87
Prior	1,892		1,892	1,854
Revolving Loans Amortized Cost Basis	25,194		25,194	19,489
Revolving Loans Converted to Term	370		370	0
Total	42,890		42,890	27,323
C&I [Member] \| Substandard [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	332		332	1,496
2023/2022	3,800		3,800	2,461
2022/2021	2,295		2,295	1,609
2021/2020	1,631		1,631	282
2020/2019	250		250	2,266
Prior	5,997		5,997	5,632
Revolving Loans Amortized Cost Basis	20,381		20,381	14,266
Revolving Loans Converted to Term	137		137	1,607
Total	34,823		34,823	29,619
C&I [Member] \| Doubtful [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	0		0	0
2023/2022	99		99	1
2022/2021	1		1	2
2021/2020	19		19	0
2020/2019	0		0	4
Prior	10		10	1
Revolving Loans Amortized Cost Basis	0		0	0
Revolving Loans Converted to Term	0		0	0
Total	129		129	8
CRE [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	232,839		232,839	357,108
2023/2022	370,404		370,404	523,404
2022/2021	521,845		521,845	594,415
2021/2020	549,632		549,632	460,311
2020/2019	439,555		439,555	340,767
Prior	1,067,972		1,067,972	816,067
Revolving Loans Amortized Cost Basis	317,096		317,096	307,971
Revolving Loans Converted to Term	54,559		54,559	33,705
Total	3,553,902		3,553,902	3,433,748
Gross Charge-offs by Loan Class by Vintage [Abstract]
2024/2023			0	0
2023/2022			0	0
2022/2021			0	0
2021/2020			0	0
2020/2019			0	(114)
Prior			0	(304)
Revolving Loans Amortized Cost Basis			0	0
Revolving Loans Converted to Term			0	0
Total			0	(418)
CRE [Member] \| Pass [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	231,892		231,892	353,161
2023/2022	358,866		358,866	518,201
2022/2021	492,938		492,938	561,897
2021/2020	523,952		523,952	452,110
2020/2019	432,230		432,230	327,804
Prior	975,497		975,497	739,189
Revolving Loans Amortized Cost Basis	311,534		311,534	294,039
Revolving Loans Converted to Term	54,559		54,559	33,705
Total	3,381,468		3,381,468	3,280,106
CRE [Member] \| Special Mention [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	947		947	3,577
2023/2022	9,375		9,375	4,472
2022/2021	10,017		10,017	10,711
2021/2020	7,754		7,754	7,055
2020/2019	4,035		4,035	9,967
Prior	31,354		31,354	39,460
Revolving Loans Amortized Cost Basis	4,288		4,288	2,970
Revolving Loans Converted to Term	0		0	0
Total	67,770		67,770	78,212
CRE [Member] \| Substandard [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	0		0	370
2023/2022	2,163		2,163	731
2022/2021	18,890		18,890	21,807
2021/2020	17,926		17,926	1,146
2020/2019	3,290		3,290	2,996
Prior	61,121		61,121	37,418
Revolving Loans Amortized Cost Basis	1,274		1,274	10,962
Revolving Loans Converted to Term	0		0	0
Total	104,664		104,664	75,430
Auto [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	318,428		318,428	474,901
2023/2022	393,476		393,476	364,757
2022/2021	300,196		300,196	158,081
2021/2020	121,213		121,213	42,834
2020/2019	29,947		29,947	45,712
Prior	31,002		31,002	13,145
Revolving Loans Amortized Cost Basis	0		0	12
Revolving Loans Converted to Term	0		0	0
Total	1,194,262		1,194,262	1,099,442
Gross Charge-offs by Loan Class by Vintage [Abstract]
2024/2023			(21)	(102)
2023/2022			(591)	(1,183)
2022/2021			(913)	(1,066)
2021/2020			(499)	(340)
2020/2019			(35)	(301)
Prior			(225)	(295)
Revolving Loans Amortized Cost Basis			0	0
Revolving Loans Converted to Term			0	0
Total			(2,284)	(3,287)
Auto [Member] \| Performing [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	318,277		318,277	474,369
2023/2022	392,472		392,472	363,516
2022/2021	299,349		299,349	157,251
2021/2020	120,481		120,481	42,644
2020/2019	29,789		29,789	45,406
Prior	30,820		30,820	13,071
Revolving Loans Amortized Cost Basis	0		0	12
Revolving Loans Converted to Term	0		0	0
Total	1,191,188		1,191,188	1,096,269
Auto [Member] \| Nonperforming [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	151		151	532
2023/2022	1,004		1,004	1,241
2022/2021	847		847	830
2021/2020	732		732	190
2020/2019	158		158	306
Prior	182		182	74
Revolving Loans Amortized Cost Basis	0		0	0
Revolving Loans Converted to Term	0		0	0
Total	3,074		3,074	3,173
Residential Solar [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	1,803		1,803	155,425
2023/2022	132,372		132,372	431,692
2022/2021	413,902		413,902	179,044
2021/2020	173,446		173,446	65,400
2020/2019	61,393		61,393	46,601
Prior	78,967		78,967	39,593
Revolving Loans Amortized Cost Basis	0		0	0
Revolving Loans Converted to Term	0		0	0
Total	861,883		861,883	917,755
Gross Charge-offs by Loan Class by Vintage [Abstract]
2024/2023			0	(150)
2023/2022			(143)	(1,930)
2022/2021			(2,036)	(923)
2021/2020			(251)	(45)
2020/2019			(34)	(558)
Prior			(492)	(345)
Revolving Loans Amortized Cost Basis			0	0
Revolving Loans Converted to Term			0	0
Total			(2,956)	(3,951)
Residential Solar [Member] \| Performing [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	1,803		1,803	155,425
2023/2022	132,249		132,249	430,855
2022/2021	413,160		413,160	178,839
2021/2020	173,286		173,286	65,382
2020/2019	61,333		61,333	46,554
Prior	78,887		78,887	39,540
Revolving Loans Amortized Cost Basis	0		0	0
Revolving Loans Converted to Term	0		0	0
Total	860,718		860,718	916,595
Residential Solar [Member] \| Nonperforming [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	0		0	0
2023/2022	123		123	837
2022/2021	742		742	205
2021/2020	160		160	18
2020/2019	60		60	47
Prior	80		80	53
Revolving Loans Amortized Cost Basis	0		0	0
Revolving Loans Converted to Term	0		0	0
Total	1,165		1,165	1,160
Other Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Overdrawn deposit related to gross charge-offs reported as 2022 originations				200
Overdrawn deposit related to gross charge-offs reported as 2023 originations			200	800
Overdrawn deposit related to gross charge-offs reported as 2024 originations			200
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	10,904		10,904	13,089
2023/2022	9,032		9,032	27,638
2022/2021	18,791		18,791	58,561
2021/2020	39,865		39,865	21,231
2020/2019	15,431		15,431	14,604
Prior	22,040		22,040	16,125
Revolving Loans Amortized Cost Basis	22,057		22,057	19,046
Revolving Loans Converted to Term	11		11	66
Total	138,131		138,131	170,360
Gross Charge-offs by Loan Class by Vintage [Abstract]
2024/2023			(191)	(885)
2023/2022			(270)	(3,744)
2022/2021			(1,383)	(7,511)
2021/2020			(2,749)	(1,329)
2020/2019			(574)	(832)
Prior			(502)	(568)
Revolving Loans Amortized Cost Basis			0	0
Revolving Loans Converted to Term			0	0
Total			(5,669)	(14,869)
Other Consumer [Member] \| Performing [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	10,904		10,904	13,089
2023/2022	9,020		9,020	27,394
2022/2021	18,664		18,664	57,876
2021/2020	39,443		39,443	21,087
2020/2019	15,264		15,264	14,548
Prior	21,743		21,743	15,964
Revolving Loans Amortized Cost Basis	22,044		22,044	19,042
Revolving Loans Converted to Term	3		3	21
Total	137,085		137,085	169,021
Other Consumer [Member] \| Nonperforming [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	0		0	0
2023/2022	12		12	244
2022/2021	127		127	685
2021/2020	422		422	144
2020/2019	167		167	56
Prior	297		297	161
Revolving Loans Amortized Cost Basis	13		13	4
Revolving Loans Converted to Term	8		8	45
Total	1,046		1,046	1,339
Residential [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	86,396		86,396	212,933
2023/2022	251,592		251,592	367,290
2022/2021	335,877		335,877	454,327
2021/2020	444,380		444,380	268,230
2020/2019	258,584		258,584	168,451
Prior	997,341		997,341	884,023
Revolving Loans Amortized Cost Basis	253,738		253,738	260,836
Revolving Loans Converted to Term	19,582		19,582	15,813
Total	2,647,490		2,647,490	2,631,903
Gross Charge-offs by Loan Class by Vintage [Abstract]
2024/2023			0	0
2023/2022			0	0
2022/2021			0	(81)
2021/2020			0	(30)
2020/2019			0	0
Prior			(114)	(406)
Revolving Loans Amortized Cost Basis			0	0
Revolving Loans Converted to Term			0	0
Total	0	$ (105)	(114)	(517)
Residential [Member] \| Performing [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	86,396		86,396	212,799
2023/2022	250,760		250,760	366,860
2022/2021	335,011		335,011	453,206
2021/2020	442,457		442,457	267,845
2020/2019	258,291		258,291	167,860
Prior	989,436		989,436	876,563
Revolving Loans Amortized Cost Basis	253,709		253,709	260,836
Revolving Loans Converted to Term	19,582		19,582	15,300
Total	2,635,642		2,635,642	2,621,269
Residential [Member] \| Nonperforming [Member]
Credit Quality by Loan Class by Vintage [Abstract]
2024/2023	0		0	134
2023/2022	832		832	430
2022/2021	866		866	1,121
2021/2020	1,923		1,923	385
2020/2019	293		293	591
Prior	7,905		7,905	7,460
Revolving Loans Amortized Cost Basis	29		29	0
Revolving Loans Converted to Term	0		0	513
Total	$ 11,848		$ 11,848	$ 10,634

Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Consolidated Statements of Comprehensive Income (Loss) (unaudited) [Abstract]
Net income	$ 32,716	$ 30,072	$ 66,539	$ 63,730
Securities available for sale:
Unrealized net holding gains (losses) arising during the period, gross	1,556	(26,783)	(3,736)	(11,058)
Tax effect	(389)	6,696	934	2,765
Unrealized net holding gains (losses) arising during the period, net	1,167	(20,087)	(2,802)	(8,293)
Reclassification adjustment for net losses in net income, gross	0	4,450	0	9,450
Tax effect	0	(1,113)	0	(2,363)
Reclassification adjustment for net losses in net income, net	0	3,337	0	7,087
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, gross	91	109	187	223
Tax effect	(23)	(28)	(47)	(56)
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, net	68	81	140	167
Total securities available for sale, net	1,235	(16,669)	(2,662)	(1,039)
Pension and other benefits:
Amortization of prior service cost and actuarial losses, gross	1,451	649	1,903	1,298
Tax effect	(363)	(162)	(476)	(325)
Amortization of prior service cost and actuarial losses, net	1,088	487	1,427	973
Increase in unrecognized actuarial loss, gross	(1,000)	0	(1,000)	0
Tax effect	250	0	250	0
Increase in unrecognized actuarial loss, net	(750)	0	(750)	0
Total pension and other benefits, net	338	487	677	973
Total other comprehensive income (loss)	1,573	(16,182)	(1,985)	(66)
Comprehensive income	$ 34,289	$ 13,890	$ 64,554	$ 63,664

Commitments and Contingencies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Guarantor Obligations [Abstract]
Obligation instrument term	1 year
Commitment to Extend Credits and Unused Lines of Credit [Member]
Guarantor Obligations [Abstract]
Commitments - maximum potential obligation	$ 2,680.0	$ 2,250.0
Standby Letters of Credit [Member]
Guarantor Obligations [Abstract]
Commitments - maximum potential obligation	$ 42.6	$ 44.7

Securities (Policies)	6 Months Ended
Securities (Policies)	Jun. 30, 2024
Securities [Abstract]
Investment, Policy	The Company does not believe the AFS securities that were in an unrealized loss position as of June 30, 2024 and December 31, 2023, which consisted of 392 and 388 individual securities, respectively, represented a credit loss impairment. AFS debt securities in unrealized loss positions are evaluated for impairment related to credit losses at least quarterly. As of June 30, 2024 and December 31, 2023, the majority of the AFS securities in an unrealized loss position consisted of debt securities issued by U.S. government agencies or U.S. government-sponsored enterprises that carry the explicit and/or implicit guarantee of the U.S. government, which are widely recognized as “risk- free” and have a long history of zero credit losses. Total gross unrealized losses were primarily attributable to changes in interest rates, relative to when the investment securities were purchased, and not due to the credit quality of the investment securities. The Company does not intend to sell, nor is it more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, which may be at maturity. The Company elected to exclude AIR from the amortized cost basis of debt securities. AIR on AFS debt securities totaled $4.0 million at June 30, 2024 and $3.9 million at December 31, 2023, and is excluded from the estimate of credit losses and reported in the other assets financial statement line. None of the Bank’s HTM debt securities were past due or on nonaccrual status as of June 30, 2024 and December 31, 2023. There was no accrued interest reversed against interest income for the three and six months ended June 30, 2024 or the year ended December 31, 2023 as all securities remained in accrual status. In addition, there were no collateral-dependent HTM debt securities as of June 30, 2024 and December 31, 2023. There was no allowance for credit losses on HTM securities as of June 30, 2024 and December 31, 2023. As of June 30, 2024 and December 31, 2023, 66% of the Company’s HTM debt securities were issued by U.S. government agencies or U.S. government-sponsored enterprises. These securities carry the explicit and/or implicit guarantee of the U.S. government, which are widely recognized as “risk-free,” and have a long history of zero credit losses. Therefore, the Company did not record an allowance for credit losses for these securities as of June 30, 2024 and December 31, 2023. The remaining HTM debt securities at June 30, 2024 and December 31, 2023 were comprised of state and municipal obligations with bond ratings of A to AAA. Utilizing the CECL methodology , the Company determined that the expected credit loss on its HTM municipal bond portfolio was immaterial and therefore no allowance for credit loss was recorded as of June 30, 2024 and December 31, 2023. AIR on HTM debt securities totaled $4.2 million at June 30, 2024 and $4.7 million at December 31, 2023 and is excluded from the estimate of credit losses and reported in the other assets financial statement line.

- Definition

Disclosure of accounting policy for investment in financial asset.

+ References + Details

Derivative Instruments and Hedging Activities

6 Months Ended

Jun. 30, 2024

Derivative Instruments and Hedging Activities [Abstract]

Derivative Instruments and Hedging Activities

11.	Derivative Instruments and Hedging Activities

The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate risk, primarily by managing the amount, sources and duration of its assets and liabilities and through the use of derivative instruments. Specifically, the Company may enter into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which is determined by interest rates. Generally, the Company may use derivative financial instruments to manage differences in the amount, timing and duration of the Company’s known or expected cash receipts and its known or expected cash payments. Currently, the Company has interest rate derivatives resulting from a service provided to certain qualifying customers and, therefore, are not used to manage interest rate risk in the Company’s assets or liabilities. The Company manages a matched book with respect to its derivative instruments in order to minimize its net risk exposure resulting from such transactions.

Derivatives Not Designated as Hedging Instruments

The Company enters into interest rate swaps to facilitate customer transactions and meet their financing needs. These swaps are considered derivatives, but are not designated as hedging relationships. These instruments have interest rate and credit risk associated with them. To mitigate the interest rate risk, the Company enters into offsetting interest rate swaps with counterparties. The counterparty swaps are also considered derivatives and are also not designated as hedging relationships. Interest rate swaps are recorded within other assets or other liabilities on the consolidated balance sheets at their estimated fair value. Changes to the fair value of assets and liabilities arising from these derivatives are included, net, in other operating income in the consolidated statements of income.

The Company is subject to over-the-counter derivative clearing requirements, which require certain derivatives to be cleared through central clearing houses. Accordingly, the Company clears certain derivative transactions through the CME. The CME requires the Company to post initial and variation margin payments to mitigate the risk of non-payment, the latter of which is received or paid daily based on the net asset or liability position of the contracts. A daily settlement occurs through the CME for changes in the fair value of centrally cleared derivatives. Not all of the derivatives are required to be cleared through the daily clearing agent. As a result, the total fair values of loan level derivative assets and liabilities recognized on the Company’s financial statements are not equal and offsetting.

In 2017, the U.K. Financial Conduct Authority announced its intention to stop compelling banks to submit rates for the calculation of LIBOR after 2021. In 2022, the Federal Reserve adopted a final rule implementing the Adjustable Interest Rate (LIBOR) Act by identifying benchmark rates based on SOFR that replaced LIBOR in certain financial contracts after June 30, 2023. In 2023, the Company transitioned all of its financial instruments to an alternative benchmark rate.

As of June 30, 2024 and December 31, 2023, the Company had sixteen and twelve risk participation agreements, respectively, with financial institution counterparties for interest rate swaps related to participated loans. Risk participation agreements provide credit protection to the financial institution that originated the swap transaction should the borrower fail to perform on its obligation. The Company enters into both risk participation agreements in which it purchases credit protection from other financial institutions and those in which it provides credit protection to other financial institutions.

The following table summarizes the derivatives outstanding:

(In thousands)	Notional Amount		Balance Sheet Location	Fair Value		Notional Amount		Balance Sheet Location	Fair Value
As of June 30, 2024
Derivatives not designated as hedging instruments
Interest rate derivatives	$	1,402,621	Other assets	$	115,638	$	1,402,621	Other liabilities	$	115,662
Risk participation agreements		91,453	Other assets		89		14,994	Other liabilities		2
Total derivatives not designated as hedging instruments				$	115,727				$	115,664
Netting adjustments⁽¹⁾					24,541					-
Net derivatives in the balance sheet				$	91,186				$	115,664
Derivatives not offset on the balance sheet				$	2,519				$	2,519
Cash collateral⁽²⁾					-					-
Net derivative amounts				$	88,667				$	113,145
As of December 31, 2023
Derivatives not designated as hedging instruments
Interest rate derivatives	$	1,303,711	Other assets	$	95,972	$	1,303,711	Other liabilities	$	95,869
Risk participation agreements		62,112	Other assets		19		16,146	Other liabilities		6
Total derivatives not designated as hedging instruments				$	95,991				$	95,875
Netting adjustments⁽¹⁾					20,849					-
Net derivatives in the balance sheet				$	75,142				$	95,875
Derivatives not offset on the balance sheet				$	2,930				$	2,930
Cash collateral⁽²⁾					-					-
Net derivative amounts				$	72,212				$	92,945

(1)

(2)

The following table indicates the gain or loss recognized in income on derivatives not designated as a hedging relationship:

	Three Months Ended June 30,					Six Months Ended June 30,
(In thousands)	2024		2023			2024		2023
Derivatives not designated as hedging instruments:
Increase (decrease) in other income	$	11	$	(7	)	$	86	$	-

Fair Value Measurements and Fair Value of Financial Instruments (Policies)	6 Months Ended
	Jun. 30, 2024
Fair Value Measurements and Fair Value of Financial Instruments [Abstract]
Fair Value of Financial Instruments, Policy	GAAP states that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value measurements are not adjusted for transaction costs. A fair value hierarchy exists within GAAP that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below: Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 - Quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; and Level 3 - Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The types of instruments valued based on quoted market prices in active markets include most U.S. government and agency securities, many other sovereign government obligations, liquid mortgage products, active listed equities and most money market securities. Such instruments are generally classified within Level 1 or Level 2 of the fair value hierarchy. The Company does not adjust the quoted prices for such instruments. The types of instruments valued based on quoted prices in markets that are not active, broker or dealer quotations or quote from alternative pricing sources with reasonable levels of price transparency include most investment-grade and high-yield corporate bonds, less liquid mortgage products, less liquid agency securities, less liquid listed equities, state, municipal and provincial obligations and certain physical commodities. Such instruments are generally classified within Level 2 of the fair value hierarchy. Certain common equity securities are reported at fair value utilizing Level 1 inputs (exchange quoted prices). Other investment securities are reported at fair value utilizing Level 1 and Level 2 inputs. The prices for Level 2 instruments are obtained through an independent pricing service or dealer market participants with whom the Company has historically transacted both purchases and sales of investment securities. Prices obtained from these sources include prices derived from market quotations and matrix pricing. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. Management reviews the methodologies used by its third-party providers in pricing the securities. Level 3 is for positions that are not traded in active markets or are subject to transfer restrictions. Valuations are adjusted to reflect illiquidity and/or non-transferability and such adjustments are generally based on available market evidence. In the absence of such evidence, management’s best estimate will be used. Management’s best estimate consists of both internal and external support on certain Level 3 investments. Subsequent to inception, management only changes Level 3 inputs and assumptions when corroborated by evidence such as transactions in similar instruments, completed or pending third-party transactions in the underlying investment or comparable entities, subsequent rounds of financing, recapitalizations and other transactions across the capital structure, offerings in the equity or debt markets and changes in financial ratios or cash flows. GAAP requires disclosure of assets and liabilities measured and recorded at fair value on a non-recurring basis such as goodwill, loans held for sale, other real estate owned, collateral-dependent loans individually evaluated for expected credit losses and HTM securities. Loans with fair value of $1.7 million as of June 30, 2024 were individually evaluated for expected credit losses where the amortized cost was adjusted to fair value. There were no loans individually evaluated for expected credit losses where the amortized cost was adjusted to fair value as of December 31, 2023. The Company uses the fair value of underlying collateral, less costs to sell, to estimate the allowance for credit losses for individually evaluated collateral dependent loans. The appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses ranging from 10% to 50%. Based on the valuation techniques used, the fair value measurements for collateral dependent individually evaluated loans are classified as Level 3. Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on and off-balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. For example, the Company has a substantial wealth operation that contributes net fee income annually. The wealth management operation is not considered a financial instrument and its value has not been incorporated into the fair value estimates. Other significant assets and liabilities include the benefits resulting from the low-cost funding of deposit liabilities as compared to the cost of borrowing funds in the market and premises and equipment. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimate of fair value. HTM Securities The fair value of the Company’s HTM securities is primarily measured using information from a third-party pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. Net Loans Net loans include portfolio loans and loans held for sale. Loans were first segregated by type and then further segmented into fixed and variable rate and loan quality categories. Expected future cash flows were projected based on contractual cash flows, adjusted for estimated prepayments, and those expected future cash flows also includes credit risk, illiquidity risk and other market factors to calculate the exit price fair value in accordance with ASC 820. Time Deposits The fair value of time deposits was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. The fair values of the Company’s time deposit liabilities do not take into consideration the value of the Company’s long-term relationships with depositors, which may have significant value. Long-Term Debt The fair value of long-term debt was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. Subordinated Debt The fair value of subordinated debt has been measured using the observable market price as of the period reported. Junior Subordinated Debt The fair value of junior subordinated debt has been estimated using a discounted cash flow analysis.

Allowance for Credit Losses and Credit Quality of Loans (Policies)	6 Months Ended
	Jun. 30, 2024
Allowance for Credit Losses and Credit Quality of Loans [Abstract]
Allowance for Credit Losses	The allowance for credit losses calculation incorporated a 6-quarter forecast period to account for forecast economic conditions under each scenario utilized in the measurement. For periods beyond the 6-quarter forecast, the model reverts to long-term economic conditions over a 4-quarter reversion period on a straight-line basis. The Company considers a baseline, upside and downside economic forecast in measuring the allowance. The quantitative model as of June 30, 2024 incorporated a baseline economic outlook along with an alternative downside scenario sourced from a reputable third-party to accommodate other potential economic conditions in the model. At June 30, 2024, the weightings were 80% and 20% for the baseline and downside economic forecasts, respectively. The baseline outlook reflects an economic environment where the Northeast unemployment rate increases slightly from 4.0% to 4.1% during the forecast period. Northeast GDP’s annualized growth (on a quarterly basis) is expected to start the third quarter of 2024 at approximately 3.7% and increase slightly to 3.8% before the end of the forecast period. Key assumptions in the baseline economic outlook included the Federal Reserve cutting rates with two 25 basis point cuts at the September and December meetings, the economy remaining at full employment, and continued tapering of the Federal Reserve balance sheet. The alternative downside scenario assumed deteriorated economic conditions from the baseline outlook. Under this scenario, Northeast unemployment rises from 4.0% in the second quarter of 2024 to a peak of 7.2% in the fourth quarter of 2025. These scenarios and their respective weightings are evaluated at each measurement date and reflect management’s expectations as of June 30, 2024. Additional adjustments were made for factors not incorporated in the forecasts or the model, such as loss rate expectations for certain loan pools, considerations for inflation, and recent trends in asset value indices. Additional monitoring for industry concentrations, loan growth, and policy exceptions was also conducted. The methodology for prepayment assumptions was revised during the second quarter of 2024 from a static, current rate experience approach to one that includes both current experience and long-term average behavior. The change to the methodology increased the allowance for loan losses by approximately 3% as of June 30, 2024. The longer-average effective life portfolios such as the residential mortgage and residential solar segments experienced a greater impact resulting from the change in methodology. The change in prepayment methodology provided an improved estimate of expected prepayments, particularly for the longer-lived portfolios. The quantitative model as of March 31, 2024 incorporated a baseline economic outlook along with an alternative downside scenario sourced from a reputable third-party to accommodate other potential economic conditions in the model. At March 31, 2024, the weightings were 70% and 30% for the baseline and downside economic forecasts, respectively. The baseline outlook reflected an economic environment where the unemployment rate increases slightly from 3.8% to 4.1% during the forecast period. Northeast GDP’s annualized growth (on a quarterly basis) was expected to start the second quarter of 2024 at approximately 3.3% and decrease to 2.8% before increasing to 3.4% by the end of the forecast period. Key assumptions in the baseline economic outlook included the Federal Reserve cutting rates with three 25 basis point cuts at the June, September, and December meetings, the economy remaining at full employment, and continued tapering of the Federal Reserve balance sheet. The alternative downside scenario assumed deteriorated economic conditions from the baseline outlook. Under this scenario, national unemployment rises from 3.8% in the first quarter of 2024 to a peak of 7.7% in the second quarter of 2025. These scenarios and their respective weightings are evaluated at each measurement date and reflect management’s expectations as of March 31, 2024. Additional adjustments were made for factors not incorporated in the forecasts or the model, such as loss rate expectations for certain loan pools, considerations for inflation, and recent trends in asset value indices. Additional monitoring for industry concentrations, loan growth, and policy exceptions was also conducted. The quantitative model as of December 31, 2023 incorporated a baseline economic outlook along with an alternative downside scenario sourced from a reputable third-party to accommodate other potential economic conditions in the model. At December 31, 2023, the weightings were 70% and 30% for the baseline and downside economic forecasts, respectively. The baseline outlook reflected an unemployment rate environment starting at 3.8% and increasing slightly during the forecast period to 4.1%. Northeast GDP’s annualized growth (on a quarterly basis) was expected to start the first quarter of 2024 at approximately 3.7% before decreasing to a low of 2.9% in the third quarter of 2024 and then increasing to 3.8% by the end of the forecast period. Other utilized economic variable forecasts are mixed compared to the prior year, with retail sales improving, business output mixed and housing starts down. Key assumptions in the baseline economic outlook included currently being in a full employment economy, continued tapering of the Federal Reserve balance sheet and the FOMC beginning to cut rates in the second quarter of 2024. The alternative downside scenario assumed deteriorated economic conditions from the baseline outlook. Under this scenario, Northeast unemployment increases to a peak of 7.0% in the first quarter of 2025. These scenarios and their respective weightings are evaluated at each measurement date and reflect management’s expectations as of December 31, 2023. Additional qualitative adjustments were made for factors not incorporated in the forecasts or the model, such as loss rate expectations for certain loan pools, considerations for inflation and recent trends in asset value indices. Additional monitoring for industry concentrations, loan growth and policy exceptions was also conducted. The Company made a policy election to report AIR in the other assets line item on the consolidated balance sheets. AIR on loans totaled $36.0 million at June 30, 2024 and $34.1 million at December 31, 2023 and there was no estimated allowance for credit losses related to AIR as of June 30, 2024 and December 31, 2023 as it is excluded from amortized cost. The Company’s January 1, 2023 adoption of ASU 2022-02, Financial Instruments - CECL Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures resulted in an insignificant change to its methodology for estimating the allowance for credit losses on TDRs. The ASU eliminated the guidance on TDRs and requires an evaluation on all loan modifications to determine if they result in a new loan or a continuation of the existing loan. The decrease in allowance for credit loss on TDR loans relating to adoption of ASU 2022-02 was $0.6 million. Credit Quality Indicators The Company has developed an internal loan grading system to evaluate and quantify the Company’s loan portfolio with respect to quality and risk. The system focuses on, among other things, financial strength of borrowers, experience and depth of borrower’s management, primary and secondary sources of repayment, payment history, nature of the business and outlook on particular industries. The internal grading system enables the Company to monitor the quality of the entire loan portfolio on a consistent basis and provide management with an early warning system, which facilitates recognition and response to problem loans and potential problem loans. Commercial Grading System For C&I and CRE loans, the Company uses a grading system that relies on quantifiable and measurable characteristics when available. This includes comparison of financial strength to available industry averages, comparison of transaction factors (loan terms and conditions) to loan policy and comparison of credit history to stated repayment terms and industry averages. Some grading factors are necessarily more subjective such as economic and industry factors, regulatory environment and management. C&I and CRE loans are graded Doubtful, Substandard, Special Mention and Pass. Doubtful A Doubtful loan has a high probability of total or substantial loss, but because of specific pending events that may strengthen the asset, its classification as a loss is deferred. Doubtful borrowers are usually in default, lack adequate liquidity or capital and lack the resources necessary to remain an operating entity. Pending events can include mergers, acquisitions, liquidations, capital injections, the perfection of liens on additional collateral, the valuation of collateral and refinancing. Generally, pending events should be resolved within a relatively short period and the ratings will be adjusted based on the new information. Nonaccrual treatment is required for Doubtful assets because of the high probability of loss. Substandard Substandard loans have a high probability of payment default or they have other well-defined weaknesses. They require more intensive supervision by bank management. Substandard loans are generally characterized by current or expected unprofitable operations, inadequate debt service coverage, inadequate liquidity or marginal capitalization. Repayment may depend on collateral or other credit risk mitigants. For some Substandard loans, the likelihood of full collection of interest and principal may be in doubt and those loans should be placed on nonaccrual. Although Substandard assets in the aggregate will have a distinct potential for loss, an individual asset’s loss potential does not have to be distinct for the asset to be rated Substandard. Special Mention Special Mention loans have potential weaknesses that may, if not checked or corrected, weaken the asset or inadequately protect the Company’s position at some future date. These loans pose elevated risk, but their weakness does not yet justify a Substandard classification. Borrowers may be experiencing adverse operating trends (i.e., declining revenues or margins) or may be struggling with an ill-proportioned balance sheet (i.e., increasing inventory without an increase in sales, high leverage and/or tight liquidity). Adverse economic or market conditions, such as interest rate increases or the entry of a new competitor, may also support a Special Mention rating. Although a Special Mention loan has a higher probability of default than a Pass asset, its default is not imminent. Pass Loans graded as Pass encompass all loans not graded as Doubtful, Substandard or Special Mention. Pass loans are in compliance with loan covenants and payments are generally made as agreed. Pass loans range from superior quality to fair quality. Pass loans also include any portion of a government guaranteed loan, including Paycheck Protection Program loans. Consumer and Residential Grading System Consumer and Residential loans are graded as either Nonperforming or Performing. Nonperforming Nonperforming loans are loans that are (1) over 90 days past due and interest is still accruing or (2) on nonaccrual status. Performing All loans not meeting any of the above criteria are considered Performing.
Loan Modifications to Borrowers Experiencing Financial Difficulties	Loan Modifications to Borrowers Experiencing Financial Difficulties When the Company modifies a loan with financial difficulty, such modifications generally include one or a combination of the following: an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; a change in scheduled payment amount; or principal forgiveness.

Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2024

Reclassification Adjustments Out of Other Comprehensive Income (Loss) [Abstract]

Reclassification Adjustments out of AOCI

The following table summarizes the reclassification adjustments out of AOCI:

Detail About AOCI Components	Amount Reclassified from AOCI						Affected Line Item in the Consolidated Statements of Comprehensive Income (Loss)
	Three Months Ended
(In thousands)	June 30, 2024			June 30, 2023
AFS securities:
Losses on AFS securities	$	-		$	4,450		Net securities (gains) losses
Amortization of unrealized gains related to securities transfer		91			109		Interest income
Tax effect	$	(23	)	$	(1,141	)	Income tax (benefit)
Net of tax	$	68		$	3,418

Pension and other benefits:
Amortization of net losses	$	1,454		$	640		Other noninterest expense
Amortization of prior service costs		(3	)		9		Other noninterest expense
Tax effect	$	(363	)	$	(162	)	Income tax (benefit)
Net of tax	$	1,088		$	487

Total reclassifications, net of tax	$	1,156		$	3,905

Detail About AOCI Components	Amount Reclassified from AOCI						Affected Line item in the Consolidated Statements of Comprehensive Income (Loss)
	Six Months Ended
(In thousands)	June 30, 2024			June 30, 2023
AFS securities:
Losses on AFS securities	$	-		$	9,450		Net securities (gains) losses
Amortization of unrealized gains related to securities transfer		187			223		Interest income
Tax effect	$	(47	)	$	(2,419	)	Income tax (benefit)
Net of tax	$	140		$	7,254


Pension and other benefits:
Amortization of net losses	$	1,908		$	1,280		Other noninterest expense
Amortization of prior service costs		(5	)		18		Other noninterest expense
Tax effect	$	(476	)	$	(325	)	Income tax (benefit)
Net of tax	$	1,427		$	973

Total reclassifications, net of tax	$	1,567		$	8,227

Fair Value Measurements and Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2024

Fair Value Measurements and Fair Value of Financial Instruments [Abstract]

Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis

(In thousands)	Level 1		Level 2		Level 3		June 30, 2024
Assets:
AFS securities:
U.S. treasury	$	135,310	$	-	$	-	$	135,310
Federal agency		-		214,326		-		214,326
State & municipal		-		86,002		-		86,002
Mortgage-backed		-		392,332		-		392,332
Collateralized mortgage obligations		-		569,488		-		569,488
Corporate		-		41,987		-		41,987
Total AFS securities	$	135,310	$	1,304,135	$	-	$	1,439,445
Equity securities		39,087		1,000		-		40,087
Derivatives		-		91,186		-		91,186
Total	$	174,397	$	1,396,321	$	-	$	1,570,718
Liabilities:
Derivatives	$	-	$	115,664	$	-	$	115,664
Total	$	-	$	115,664	$	-	$	115,664

(In thousands)	Level 1		Level 2		Level 3		December 31, 2023
Assets:
AFS securities:
U.S. treasury	$	125,024	$	-	$	-	$	125,024
Federal agency		-		214,740		-		214,740
State & municipal		-		86,306		-		86,306
Mortgage-backed		-		422,268		-		422,268
Collateralized mortgage obligations		-		541,544		-		541,544
Corporate		-		40,976		-		40,976
Total AFS securities	$	125,024	$	1,305,834	$	-	$	1,430,858
Equity securities		36,591		1,000		-		37,591
Derivatives		-		75,142		-		75,142
Total	$	161,615	$	1,381,976	$	-	$	1,543,591
Liabilities:
Derivatives	$	-	$	95,875	$	-	$	95,875
Total	$	-	$	95,875	$	-	$	95,875

Information with Regard to Estimated Fair Values of Financial Instruments

			June 30, 2024				December 31, 2023
(In thousands)	Fair Value Hierarchy		Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
HTM securities		2	$	878,909	$	780,490	$	905,267	$	814,524
Net loans		3		9,737,030		9,366,639		9,539,684		9,216,162
Financial liabilities:
Time deposits		2	$	1,404,797	$	1,384,422	$	1,324,709	$	1,285,999
Long-term debt		2		29,721		29,531		29,796		29,416
Subordinated debt		1		120,880		113,768		120,380		113,757
Junior subordinated debt		2		101,196		103,563		101,196		102,337

Loans (Tables)

6 Months Ended

Jun. 30, 2024

Loans [Abstract]

Loans, Net of Deferred Fees and Origination Costs

A summary of loans, net of deferred fees and origination costs, by category is as follows:

(In thousands)	June 30, 2024		December 31, 2023
Commercial & industrial	$	1,397,935	$	1,354,248
Commercial real estate		3,784,214		3,626,910
Residential real estate		2,134,875		2,125,804
Home equity		326,556		337,214
Indirect auto		1,225,786		1,130,132
Residential solar		861,883		917,755
Other consumer		123,098		158,650
Total loans	$	9,854,347	$	9,650,713

Defined Benefit Post-Retirement Plans

6 Months Ended

Jun. 30, 2024

Defined Benefit Post-Retirement Plans [Abstract]

Defined Benefit Post-Retirement Plans

8.	Defined Benefit Post-Retirement Plans

The Company has a qualified, noncontributory, defined benefit pension plan (the “Plan”) covering substantially all of its employees at June 30, 2024. Benefits paid from the Plan are based on age, years of service, compensation and social security benefits and are determined in accordance with defined formulas. The Company’s policy is to fund the Plan in accordance with Employee Retirement Income Security Act of 1974 standards. Assets of the Plan are invested in publicly traded stocks, bonds and mutual funds. In addition to the Plan, the Company provides supplemental employee retirement plans to certain current and former executives. These supplemental employee retirement plans and the Plan are collectively referred to herein as “Pension Benefits.”

In addition, the Company provides certain health care benefits for retired employees. Benefits were accrued over the employees’ active service period. Only employees that were employed by the Company on or before January 1, 2000 are eligible to receive post-retirement health care benefits. These post-retirement benefits are referred to herein as “Other Benefits.”

Accounting standards require an employer to: (1) recognize the overfunded or underfunded status of defined benefit post-retirement plans, which is measured as the difference between plan assets at fair value and the benefit obligation, as an asset or liability in its balance sheet; (2) recognize changes in that funded status in the year in which the changes occur through comprehensive income; and (3) measure the defined benefit plan assets and obligations as of the date of its year-end balance sheet.

The Company made no voluntary contributions to the Pension Benefits and Other Benefits plans during the three and six months ended June 30, 2024 and 2023.

The components of expense for Pension Benefits and Other Benefits are set forth below:

	Pension Benefits						Other Benefits
	Three Months Ended June 30,						Three Months Ended June 30,
(In thousands)	2024			2023			2024			2023
Components of net periodic cost (benefit):
Service cost	$	513		$	482		$	1		$	1
Interest cost		1,006			1,010			55			56
Expected return on plan assets		(1,982	)		(1,853	)		-			-
Net amortization		1,452			670			(1	)		(21	)
Total net periodic cost (benefit)	$	989		$	309		$	55		$	36

	Pension Benefits						Other Benefits
	Six Months Ended June 30,						Six Months Ended June 30,
(In thousands)	2024			2023			2024			2023
Components of net periodic cost (benefit):
Service cost	$	1,027		$	964		$	2		$	2
Interest cost		2,011			2,020			110			112
Expected return on plan assets		(3,965	)		(3,706	)		-			-
Net amortization		1,905			1,340			(2	)		(42	)
Total net periodic cost (benefit)	$	978		$	618		$	110		$	72

The service cost component of the net periodic cost (benefit) is included in Salaries and Employee Benefits and the interest cost, expected return on plan assets and net amortization components are included in Other Noninterest Expense on the unaudited interim consolidated statements of income.

- Definition

The entire disclosure for retirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(03)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (q)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (l)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/715/tableOfContent

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (o)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (p)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (r)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (r)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480126/715-20-S99-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480266/715-60-50-3

+ Details

Allowance for Credit Losses and Credit Quality of Loans, Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest Rate Reduction [Member]
Financing Receivable Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty [Abstract]
Decrease in weighted average contractual interest rate	1.00%	3.50%	1.00%	3.50%
Residential [Member] \| Term Extension [Member]
Financing Receivable Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty [Abstract]
Period of increase in weighted-average maturity	5 years 3 months 18 days	10 years	6 years 3 months 18 days	14 years

Description of Business (Policies)	6 Months Ended
Description of Business (Policies)	Jun. 30, 2024
Description of Business [Abstract]
Nature of Operations	NBT Bancorp Inc. is a registered financial holding company incorporated in the state of Delaware in 1986, with its principal headquarters located in Norwich, New York. The principal assets of NBT Bancorp Inc. consist of all of the outstanding shares of common stock of its subsidiaries, including: NBT Bank, National Association (the “Bank”), NBT Financial Services, Inc. (“NBT Financial”), NBT Holdings, Inc. (“NBT Holdings”), CNBF Capital Trust I, NBT Statutory Trust I, NBT Statutory Trust II, Alliance Financial Capital Trust I and Alliance Financial Capital Trust II (collectively, the “Trusts”). The principal sources of revenue for NBT Bancorp Inc. are the management fees and dividends it receives from the Bank, NBT Financial and NBT Holdings. Collectively, NBT Bancorp Inc. and its subsidiaries are referred to herein as (the “Company”). The Company’s business, primarily conducted through the Bank, consists of providing commercial banking, retail banking and wealth management services primarily to customers in its market area, which includes upstate New York, northeastern Pennsylvania, southern New Hampshire, western Massachusetts, Vermont, southern Maine and central and northwestern Connecticut. The Company has been, and intends to continue to be, a community-oriented financial institution offering a variety of financial services. The Company’s business philosophy is to operate as a community bank with local decision-making, providing a broad array of banking and financial services to retail, commercial and municipal customers. The Company completed the acquisition of Salisbury in August of 2023, a commercial bank with $1.46 billion in assets with 13 banking offices in northwestern Connecticut, the Hudson Valley region of New York and southwestern Massachusetts.

Securities, AFS Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	$ 56,084
From one to five years	579,028
From five to ten years	305,590
After ten years	686,699
Amortized cost	1,627,401	$ 1,615,078
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	55,606
From one to five years	521,402
From five to ten years	269,587
After ten years	592,850
Fair value	$ 1,439,445	$ 1,430,858

Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Jun. 30, 2024
Summary of Significant Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited interim consolidated financial statements include the accounts of NBT Bancorp Inc. and its wholly-owned subsidiaries: the Bank, NBT Financial and NBT Holdings. In the opinion of management, the interim data includes all adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation of the results for the interim periods in accordance with GAAP and in accordance with the instructions to Quarterly Report on Form 10-Q and Article 10 of Regulation S-X as promulgated by the SEC. Accordingly, the consolidated financial statements do not include all of the information and notes necessary for complete financial statements in conformity with GAAP. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s 2023 Annual Report on Form 10-K. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other interim period. All material intercompany transactions have been eliminated in consolidation. Amounts previously reported in the consolidated financial statements are reclassified whenever necessary to conform to the current period presentation. The Company has evaluated subsequent events for potential recognition and/or disclosure, and there were none identified.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Actual results may differ from those estimates and such differences could be material to the financial statements. Estimates associated with the allowance for credit losses, pension accounting, provision for income taxes, fair values of financial instruments and status of contingencies are particularly susceptible to material change in the near term.

Allowance for Credit Losses and Credit Quality of Loans, Financing Receivables with Payment Default that Were Modified to Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Amortized Cost Basis of Modified Financing Receivables that Subsequently Defaulted [Abstract]
Financing receivables with payment default that were modified to borrowers experiencing financial difficulty		$ 0		$ 0
Term Extension [Member]
Amortized Cost Basis of Modified Financing Receivables that Subsequently Defaulted [Abstract]
Total	$ 171		$ 171
Term Extension [Member] \| Residential [Member]
Amortized Cost Basis of Modified Financing Receivables that Subsequently Defaulted [Abstract]
Total	$ 171		$ 171

Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2024

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Summary of Derivatives Outstanding

The following table summarizes the derivatives outstanding:

(In thousands)	Notional Amount		Balance Sheet Location	Fair Value		Notional Amount		Balance Sheet Location	Fair Value
As of June 30, 2024
Derivatives not designated as hedging instruments
Interest rate derivatives	$	1,402,621	Other assets	$	115,638	$	1,402,621	Other liabilities	$	115,662
Risk participation agreements		91,453	Other assets		89		14,994	Other liabilities		2
Total derivatives not designated as hedging instruments				$	115,727				$	115,664
Netting adjustments⁽¹⁾					24,541					-
Net derivatives in the balance sheet				$	91,186				$	115,664
Derivatives not offset on the balance sheet				$	2,519				$	2,519
Cash collateral⁽²⁾					-					-
Net derivative amounts				$	88,667				$	113,145
As of December 31, 2023
Derivatives not designated as hedging instruments
Interest rate derivatives	$	1,303,711	Other assets	$	95,972	$	1,303,711	Other liabilities	$	95,869
Risk participation agreements		62,112	Other assets		19		16,146	Other liabilities		6
Total derivatives not designated as hedging instruments				$	95,991				$	95,875
Netting adjustments⁽¹⁾					20,849					-
Net derivatives in the balance sheet				$	75,142				$	95,875
Derivatives not offset on the balance sheet				$	2,930				$	2,930
Cash collateral⁽²⁾					-					-
Net derivative amounts				$	72,212				$	92,945

(1)

(2)

Not Designated as Hedging Instrument [Member]

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Effect of Derivatives on AOCI and on Consolidated Statement of Income

The following table indicates the gain or loss recognized in income on derivatives not designated as a hedging relationship:

	Three Months Ended June 30,					Six Months Ended June 30,
(In thousands)	2024		2023			2024		2023
Derivatives not designated as hedging instruments:
Increase (decrease) in other income	$	11	$	(7	)	$	86	$	-

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References + Details

Loans

6 Months Ended

Jun. 30, 2024

Loans [Abstract]

Loans

A summary of loans, net of deferred fees and origination costs, by category is as follows:

(In thousands)	June 30, 2024		December 31, 2023
Commercial & industrial	$	1,397,935	$	1,354,248
Commercial real estate		3,784,214		3,626,910
Residential real estate		2,134,875		2,125,804
Home equity		326,556		337,214
Indirect auto		1,225,786		1,130,132
Residential solar		861,883		917,755
Other consumer		123,098		158,650
Total loans	$	9,854,347	$	9,650,713

Included in the above loans are net deferred loan origination (fees) costs totaling $80.9 million and $98.2 million at June 30, 2024 and December 31, 2023, respectively.

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2024

Earnings Per Share [Abstract]

Reconciliation of Basic and Diluted Earnings Per Share

The following is a reconciliation of basic and diluted EPS for the periods presented in the unaudited interim consolidated statements of income:

	Three Months Ended June 30,
(In thousands, except per share data)	2024		2023
Basic EPS:
Weighted average common shares outstanding		47,158		42,905
Net income available to common stockholders	$	32,716	$	30,072
Basic EPS	$	0.69	$	0.70

Diluted EPS:
Weighted average common shares outstanding		47,158		42,905
Dilutive effect of common stock options and restricted stock		225		221
Weighted average common shares and common share equivalents		47,383		43,126
Net income available to common stockholders	$	32,716	$	30,072
Diluted EPS	$	0.69	$	0.70

Anti-dilutive stock options and restricted stock outstanding		2		61

	Six Months Ended June 30,
(In thousands, except per share data)	2024		2023
Basic EPS:
Weighted average common shares outstanding		47,153		42,900
Net income available to common stockholders	$	66,539	$	63,730
Basic EPS	$	1.41	$	1.49

Diluted EPS:
Weighted average common shares outstanding		47,153		42,900
Dilutive effect of common stock options and restricted stock		228		229
Weighted average common shares and common share equivalents		47,381		43,129
Net income available to common stockholders	$	66,539	$	63,730
Diluted EPS	$	1.40	$	1.48

Anti-dilutive stock options and restricted stock outstanding		2		24

Defined Benefit Post-Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2024

Defined Benefit Post-Retirement Plans [Abstract]

Net Periodic Pension Benefits and Other Benefit Costs

The components of expense for Pension Benefits and Other Benefits are set forth below:

	Pension Benefits						Other Benefits
	Three Months Ended June 30,						Three Months Ended June 30,
(In thousands)	2024			2023			2024			2023
Components of net periodic cost (benefit):
Service cost	$	513		$	482		$	1		$	1
Interest cost		1,006			1,010			55			56
Expected return on plan assets		(1,982	)		(1,853	)		-			-
Net amortization		1,452			670			(1	)		(21	)
Total net periodic cost (benefit)	$	989		$	309		$	55		$	36

	Pension Benefits						Other Benefits
	Six Months Ended June 30,						Six Months Ended June 30,
(In thousands)	2024			2023			2024			2023
Components of net periodic cost (benefit):
Service cost	$	1,027		$	964		$	2		$	2
Interest cost		2,011			2,020			110			112
Expected return on plan assets		(3,965	)		(3,706	)		-			-
Net amortization		1,905			1,340			(2	)		(42	)
Total net periodic cost (benefit)	$	978		$	618		$	110		$	72

Securities, HTM Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2024 USD ($) Position	Jun. 30, 2024 USD ($) Position	Dec. 31, 2023 USD ($) Position
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 14,379	$ 14,379	$ 26,643
12 months or longer	668,227	668,227	675,260
Total	682,606	682,606	701,903
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(167)	(167)	(492)
12 months or longer	(98,330)	(98,330)	(90,522)
Total	$ (98,497)	$ (98,497)	$ (91,014)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months \| Position	7	7	22
12 months or longer \| Position	293	293	280
Total \| Position	300	300	302
HTM debt securities, nonaccrual	$ 0	$ 0	$ 0
Accrued interest reversed against interest income	0	0	0
Collateral-dependent HTM debt securities	0	0	0
Allowance for credit losses on HTM securities	0	0	0
AIR on HTM debt securities	$ 4,200	$ 4,200	$ 4,700
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets	Other Assets
Past Due [Member]
Unrealized Loss Position, Number of Positions [Abstract]
HTM debt securities	$ 0	$ 0	$ 0
Federal Agency [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	0	0	0
12 months or longer	81,952	81,952	82,216
Total	81,952	81,952	82,216
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	0	0	0
12 months or longer	(18,048)	(18,048)	(17,784)
Total	$ (18,048)	$ (18,048)	$ (17,784)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months \| Position	0	0	0
12 months or longer \| Position	4	4	4
Total \| Position	4	4	4
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 0	$ 0	$ 12,221
12 months or longer	200,630	200,630	201,320
Total	200,630	200,630	213,541
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	0	0	(365)
12 months or longer	(34,896)	(34,896)	(31,814)
Total	$ (34,896)	$ (34,896)	$ (32,179)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months \| Position	0	0	1
12 months or longer \| Position	34	34	33
Total \| Position	34	34	34
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 7,822	$ 7,822	$ 0
12 months or longer	207,453	207,453	219,820
Total	215,275	215,275	219,820
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(84)	(84)	0
12 months or longer	(24,964)	(24,964)	(22,929)
Total	$ (25,048)	$ (25,048)	$ (22,929)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months \| Position	1	1	0
12 months or longer \| Position	52	52	54
Total \| Position	53	53	54
State & Municipal [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 6,557	$ 6,557	$ 14,422
12 months or longer	178,192	178,192	171,904
Total	184,749	184,749	186,326
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(83)	(83)	(127)
12 months or longer	(20,422)	(20,422)	(17,995)
Total	$ (20,505)	$ (20,505)	$ (18,122)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months \| Position	6	6	21
12 months or longer \| Position	203	203	189
Total \| Position	209	209	210
US Government Agencies Debt Securities and US Government-sponsored Enterprises Debt Securities [Member]
Unrealized Loss Position, Number of Positions [Abstract]
Held-to-maturity debt securities, percentage		66.00%	66.00%

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets
Securities held to maturity fair value	$ 780,490	$ 814,524
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	2,500,000	2,500,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	53,974,492	53,974,492
Common stock in treasury, at cost (in shares)	6,809,123	6,864,593

Consolidated Statements of Changes in Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in-Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Common Stock in Treasury [Member]	Total	Cumulative Effect Adjustment for ASU Implementation [Member] Common Stock [Member]	Cumulative Effect Adjustment for ASU Implementation [Member] Additional Paid-in-Capital [Member]	Cumulative Effect Adjustment for ASU Implementation [Member] Retained Earnings [Member]	Cumulative Effect Adjustment for ASU Implementation [Member] Accumulated Other Comprehensive (Loss) Income [Member]	Cumulative Effect Adjustment for ASU Implementation [Member] Common Stock in Treasury [Member]	Cumulative Effect Adjustment for ASU Implementation [Member]
Balance at Dec. 31, 2022	$ 497	$ 577,853	$ 958,433	$ (190,034)	$ (173,195)	$ 1,173,554
Balance (ASU 2022-02 [Member]) at Dec. 31, 2022							$ 0	$ 0	$ 502	$ 0	$ 0	$ 502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	63,730	0	0	63,730
Cash dividends	0	0	(25,745)	0	0	(25,745)
Purchase of treasury shares	0	0	0	0	(2,778)	(2,778)
Net issuance of shares to employee and other stock plans	0	(2,843)	0	0	827	(2,016)
Stock-based compensation	0	3,312	0	0	0	3,312
Other comprehensive income (loss)	0	0	0	(66)	0	(66)
Balance at Jun. 30, 2023	497	578,322	996,920	(190,100)	(175,146)	1,210,493
Balance at Mar. 31, 2023	497	577,952	979,722	(173,918)	(172,594)	1,211,659
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	30,072	0	0	30,072
Cash dividends	0	0	(12,874)	0	0	(12,874)
Purchase of treasury shares	0	0	0	0	(2,778)	(2,778)
Net issuance of shares to employee and other stock plans	0	(477)	0	0	226	(251)
Stock-based compensation	0	847	0	0	0	847
Other comprehensive income (loss)	0	0	0	(16,182)	0	(16,182)
Balance at Jun. 30, 2023	497	578,322	996,920	(190,100)	(175,146)	1,210,493
Balance at Dec. 31, 2023	540	740,943	1,021,831	(160,934)	(176,689)	1,425,691
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	66,539	0	0	66,539
Cash dividends	0	0	(30,183)	0	0	(30,183)
Purchase of treasury shares	0	0	0	0	(251)	(251)
Net issuance of shares to employee and other stock plans	0	(3,201)	0	0	1,154	(2,047)
Stock-based compensation	0	4,191	0	0	0	4,191
Other comprehensive income (loss)	0	0	0	(1,985)	0	(1,985)
Balance at Jun. 30, 2024	540	741,933	1,058,187	(162,919)	(175,786)	1,461,955
Balance at Mar. 31, 2024	540	740,792	1,040,563	(164,492)	(175,988)	1,441,415
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	32,716	0	0	32,716
Cash dividends	0	0	(15,092)	0	0	(15,092)
Purchase of treasury shares	0	0	0	0	(188)	(188)
Net issuance of shares to employee and other stock plans	0	(766)	0	0	390	(376)
Stock-based compensation	0	1,907	0	0	0	1,907
Other comprehensive income (loss)	0	0	0	1,573	0	1,573
Balance at Jun. 30, 2024	$ 540	$ 741,933	$ 1,058,187	$ (162,919)	$ (175,786)	$ 1,461,955

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 60
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476176/805-60-65-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 323
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478666/740-323-65-2

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482765/220-10-50-6

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-3

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480175/815-40-65-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-8

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-11

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-11

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-4

Reference 17: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479168/946-830-55-10

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479105/946-220-45-7

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(18))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(9))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(1)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 23: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iii)(A))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iv))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(A))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(B))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iv))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 32: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 60B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482689/260-10-45-60B

Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-7

Reference 34: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 35: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1A

Reference 36: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1B

Reference 37: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(31))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481372/852-10-55-10

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479168/946-830-55-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(19))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.6-05(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(4)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(7))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 14: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 4.E)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480418/310-10-S99-2

+ Details

Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2024

Recent Accounting Pronouncements [Abstract]

Recent Accounting Pronouncements

3.	Recent Accounting Pronouncements

Accounting Standards Issued Not Yet Adopted

In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements, which amends the disclosure or presentation requirements related to various subtopics in the FASB Accounting Standards Codification. The ASU was issued in response to the SEC’s August 2018 final rule that updated and simplified disclosure requirements that the SEC believed were redundant, duplicative, overlapping, outdated, or superseded. The new guidance is intended to align GAAP requirements with those of the SEC. The ASU will become effective on the earlier of the date on which the SEC removes its disclosure requirements for the related disclosure or June 30, 2027. Early adoption is not permitted. The adoption, other than to meet the new disclosure requirements, is not expected to have a material impact on the consolidated financial statements.

In November 2023, the FASB issued ASU 2023-07, Improvements to Reportable Segment Disclosures, to improve the reportable segment disclosure requirements by requiring disclosure of incremental segment information on an annual and interim basis. In addition, the amendments will enhance interim disclosure requirements, clarify circumstances in which an entity can disclose multiple segment measures of profit or loss, provide new segment disclosure requirements for entities with a single reportable segment and contain other disclosure requirements. The amendments in this ASU are effective for the Company for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024, and early adoption is permitted. The adoption, other than to meet the new disclosure requirements, is not expected to have a material impact on the consolidated financial statements.

In December 2023, the FASB issued ASU 2023-09, Improvements to Income Tax Disclosures, that addresses requests for improved income tax disclosures from investors, lenders, creditors and other allocators of capital that use the financial statements to make capital allocation decisions. The ASU requires enhanced disclosures primarily related to existing rate reconciliation and income taxes paid information to help investors better assess how the Company’s operations and related tax risks and tax planning and operational opportunities affect the Company’s tax rate and prospects for future cash flows. The ASU 2023-09 improves the transparency of income tax disclosures. The amendments in this ASU are effective for the Company on January 1, 2025 and should be applied on a prospective basis. Retrospective application and early adoption are permitted. The adoption, other than to meet the new disclosure requirements, is not expected to have a material impact on the consolidated financial statements.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476173/280-10-65-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 105
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479343/105-10-65-7

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 60
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476176/805-60-65-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 848
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483550/848-10-65-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 323
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478666/740-323-65-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 323
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478666/740-323-65-2

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 323
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478666/740-323-65-2

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 848
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (d)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483550/848-10-65-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 848
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483550/848-10-65-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(iii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(iv)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (h)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 11.M.Q2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480530/250-10-S99-5

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 6
-Subparagraph (i)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480528/815-20-65-6

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479654/326-10-65-4

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (e)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479654/326-10-65-4

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (f)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483194/926-20-65-2

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (f)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483194/926-20-65-2

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (f)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483194/926-20-65-2

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480530/250-10-S99-6

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 250
-Publisher FASB
-URI https://asc.fasb.org/250/tableOfContent

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480175/815-40-65-1

+ Details

Recent Accounting Pronouncements (Policies)	6 Months Ended
Recent Accounting Pronouncements (Policies)	Jun. 30, 2024
Recent Accounting Pronouncements [Abstract]
Accounting Standards Issued Not Yet Adopted	Accounting Standards Issued Not Yet Adopted In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements, which amends the disclosure or presentation requirements related to various subtopics in the FASB Accounting Standards Codification. The ASU was issued in response to the SEC’s August 2018 final rule that updated and simplified disclosure requirements that the SEC believed were redundant, duplicative, overlapping, outdated, or superseded. The new guidance is intended to align GAAP requirements with those of the SEC. The ASU will become effective on the earlier of the date on which the SEC removes its disclosure requirements for the related disclosure or June 30, 2027. Early adoption is not permitted. The adoption, other than to meet the new disclosure requirements, is not expected to have a material impact on the consolidated financial statements. In November 2023, the FASB issued ASU 2023-07, Improvements to Reportable Segment Disclosures, to improve the reportable segment disclosure requirements by requiring disclosure of incremental segment information on an annual and interim basis. In addition, the amendments will enhance interim disclosure requirements, clarify circumstances in which an entity can disclose multiple segment measures of profit or loss, provide new segment disclosure requirements for entities with a single reportable segment and contain other disclosure requirements. The amendments in this ASU are effective for the Company for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024, and early adoption is permitted. The adoption, other than to meet the new disclosure requirements, is not expected to have a material impact on the consolidated financial statements. In December 2023, the FASB issued ASU 2023-09, Improvements to Income Tax Disclosures, that addresses requests for improved income tax disclosures from investors, lenders, creditors and other allocators of capital that use the financial statements to make capital allocation decisions. The ASU requires enhanced disclosures primarily related to existing rate reconciliation and income taxes paid information to help investors better assess how the Company’s operations and related tax risks and tax planning and operational opportunities affect the Company’s tax rate and prospects for future cash flows. The ASU 2023-09 improves the transparency of income tax disclosures. The amendments in this ASU are effective for the Company on January 1, 2025 and should be applied on a prospective basis. Retrospective application and early adoption are permitted. The adoption, other than to meet the new disclosure requirements, is not expected to have a material impact on the consolidated financial statements.

Allowance for Credit Losses and Credit Quality of Loans (Tables)

6 Months Ended

Jun. 30, 2024

Allowance for Credit Losses and Credit Quality of Loans [Abstract]

Allowance for Loan Losses by Portfolio

The following tables present the activity in the allowance for credit losses by our portfolio segments:

(In thousands)	Commercial Loans			Consumer Loans			Residential			Total
Balance as of March 31, 2024	$	44,472		$	47,419		$	23,409		$	115,300
Charge-offs		(299	)		(5,328	)		-			(5,627	)
Recoveries		292			1,559			77			1,928
Provision		2,243			4,268			2,388			8,899
Ending balance as of June 30, 2024	$	46,708		$	47,918		$	25,874		$	120,500

Balance as of March 31, 2023	$	36,040		$	48,820		$	15,390		$	100,250
Charge-offs		(207	)		(4,837	)		(105	)		(5,149	)
Recoveries		97			1,441			155			1,693
Provision		1,033			2,459			114			3,606
Ending balance as of June 30, 2023	$	36,963		$	47,883		$	15,554		$	100,400

(In thousands)	Commercial Loans			Consumer Loans			Residential			Total
Balance as of December 31, 2023	$	45,903		$	46,427		$	22,070		$	114,400
Charge-offs		(1,284	)		(10,909	)		(114	)		(12,307	)
Recoveries		490			3,210			229			3,929
Provision		1,599			9,190			3,689			14,478
Ending balance as of June 30, 2024	$	46,708		$	47,918		$	25,874		$	120,500

Balance as of January 1, 2023 (after adoption of ASU 2022-02)	$	34,662		$	50,951		$	14,539		$	100,152
Charge-offs		(376	)		(10,179	)		(444	)		(10,999	)
Recoveries		638			2,818			276			3,732
Provision		2,039			4,293			1,183			7,515
Ending balance as of June 30, 2023	$	36,963		$	47,883		$	15,554		$	100,400

Past due and Nonperforming Loans by Loan Class

The following table sets forth information with regard to past due and nonperforming loans by loan segment:

(In thousands)	31-60 Days Past Due Accruing		61-90 Days Past Due Accruing		Greater Than 90 Days Past Due Accruing		Total Past Due Accruing		Nonaccrual		Current		Recorded Total Loans
As of June 30, 2024
Commercial loans:
C&I	$	929	$	1,149	$	12	$	2,090	$	2,586	$	1,454,003	$	1,458,679
CRE		790		238		-		1,028		18,357		3,534,517		3,553,902
Total commercial loans	$	1,719	$	1,387	$	12	$	3,118	$	20,943	$	4,988,520	$	5,012,581
Consumer loans:
Auto	$	9,653	$	1,735	$	995	$	12,383	$	2,079	$	1,179,800	$	1,194,262
Residential solar		4,038		1,356		1,043		6,437		122		855,324		861,883
Other consumer		1,523		960		787		3,270		259		134,602		138,131
Total consumer loans	$	15,214	$	4,051	$	2,825	$	22,090	$	2,460	$	2,169,726	$	2,194,276
Residential	$	3,312	$	903	$	496	$	4,711	$	11,352	$	2,631,427	$	2,647,490
Total loans	$	20,245	$	6,341	$	3,333	$	29,919	$	34,755	$	9,789,673	$	9,854,347

(In thousands)	31-60 Days Past Due Accruing		61-90 Days Past Due Accruing		Greater Than 90 Days Past Due Accruing		Total Past Due Accruing		Nonaccrual		Current		Recorded Total Loans
As of December 31, 2023
Commercial loans:
C&I	$	414	$	33	$	1	$	448	$	3,441	$	1,393,616	$	1,397,505
CRE		803		835		-		1,638		18,126		3,413,984		3,433,748
Total commercial loans	$	1,217	$	868	$	1	$	2,086	$	21,567	$	4,807,600	$	4,831,253
Consumer loans:
Auto	$	10,115	$	2,011	$	1,067	$	13,193	$	2,106	$	1,084,143	$	1,099,442
Residential solar		3,074		1,301		915		5,290		245		912,220		917,755
Other consumer		2,343		1,811		1,124		5,278		215		164,867		170,360
Total consumer loans	$	15,532	$	5,123	$	3,106	$	23,761	$	2,566	$	2,161,230	$	2,187,557
Residential	$	3,836	$	399	$	554	$	4,789	$	10,080	$	2,617,034	$	2,631,903
Total loans	$	20,585	$	6,390	$	3,661	$	30,636	$	34,213	$	9,585,864	$	9,650,713

Credit Quality by Loan Class by Year of Origination (Vintage)

(In thousands)	2024			2023			2022			2021			2020			Prior			Revolving Loans Amortized Cost Basis		Revolving Loans Converted to Term		Total
As of June 30, 2024
C&I
By internally assigned grade:
Pass	$	149,845		$	199,272		$	219,561		$	207,165		$	136,993		$	115,577		$	338,577	$	13,847	$	1,380,837
Special mention		557			4,909			5,531			434			4,003			1,892			25,194		370		42,890
Substandard		332			3,800			2,295			1,631			250			5,997			20,381		137		34,823
Doubtful		-			99			1			19			-			10			-		-		129
Total C&I	$	150,734		$	208,080		$	227,388		$	209,249		$	141,246		$	123,476		$	384,152	$	14,354	$	1,458,679
Current-period gross charge-offs	$	-		$	(58	)	$	(915	)	$	(4	)	$	-		$	(307	)	$	-	$	-	$	(1,284	)
CRE
By internally assigned grade:
Pass	$	231,892		$	358,866		$	492,938		$	523,952		$	432,230		$	975,497		$	311,534	$	54,559	$	3,381,468
Special mention		947			9,375			10,017			7,754			4,035			31,354			4,288		-		67,770
Substandard		-			2,163			18,890			17,926			3,290			61,121			1,274		-		104,664
Total CRE	$	232,839		$	370,404		$	521,845		$	549,632		$	439,555		$	1,067,972		$	317,096	$	54,559	$	3,553,902
Current-period gross charge-offs	$	-		$	-		$	-		$	-		$	-		$	-		$	-	$	-	$	-
Auto
By payment activity:
Performing	$	318,277		$	392,472		$	299,349		$	120,481		$	29,789		$	30,820		$	-	$	-	$	1,191,188
Nonperforming		151			1,004			847			732			158			182			-		-		3,074
Total auto	$	318,428		$	393,476		$	300,196		$	121,213		$	29,947		$	31,002		$	-	$	-	$	1,194,262
Current-period gross charge-offs	$	(21	)	$	(591	)	$	(913	)	$	(499	)	$	(35	)	$	(225	)	$	-	$	-	$	(2,284	)
Residential solar
By payment activity:
Performing	$	1,803		$	132,249		$	413,160		$	173,286		$	61,333		$	78,887		$	-	$	-	$	860,718
Nonperforming		-			123			742			160			60			80			-		-		1,165
Total residential solar	$	1,803		$	132,372		$	413,902		$	173,446		$	61,393		$	78,967		$	-	$	-	$	861,883
Current-period gross charge-offs	$	-		$	(143	)	$	(2,036	)	$	(251	)	$	(34	)	$	(492	)	$	-	$	-	$	(2,956	)
Other consumer
By payment activity:
Performing	$	10,904		$	9,020		$	18,664		$	39,443		$	15,264		$	21,743		$	22,044	$	3	$	137,085
Nonperforming		-			12			127			422			167			297			13		8		1,046
Total other consumer	$	10,904		$	9,032		$	18,791		$	39,865		$	15,431		$	22,040		$	22,057	$	11	$	138,131
Current-period gross charge-offs	$	(191	)	$	(270	)	$	(1,383	)	$	(2,749	)	$	(574	)	$	(502	)	$	-	$	-	$	(5,669	)
Residential
By payment activity:
Performing	$	86,396		$	250,760		$	335,011		$	442,457		$	258,291		$	989,436		$	253,709	$	19,582	$	2,635,642
Nonperforming		-			832			866			1,923			293			7,905			29		-		11,848
Total residential	$	86,396		$	251,592		$	335,877		$	444,380		$	258,584		$	997,341		$	253,738	$	19,582	$	2,647,490
Current-period gross charge-offs	$	-		$	-		$	-		$	-		$	-		$	(114	)	$	-	$	-	$	(114	)
Total loans	$	801,104		$	1,364,956		$	1,817,999		$	1,537,785		$	946,156		$	2,320,798		$	977,043	$	88,506	$	9,854,347
Current-period gross charge-offs	$	(212	)	$	(1,062	)	$	(5,247	)	$	(3,503	)	$	(643	)	$	(1,640	)	$	-	$	-	$	(12,307	)

(In thousands)	2023			2022			2021			2020			2019			Prior			Revolving Loans Amortized Cost Basis		Revolving Loans Converted to Term		Total
As of December 31, 2023
C&I
By internally assigned grade:
Pass	$	229,249		$	270,796		$	241,993		$	158,051		$	74,469		$	63,826		$	299,248	$	2,923	$	1,340,555
Special mention		420			1,672			277			3,524			87			1,854			19,489		-		27,323
Substandard		1,496			2,461			1,609			282			2,266			5,632			14,266		1,607		29,619
Doubtful		-			1			2			-			4			1			-		-		8
Total C&I	$	231,165		$	274,930		$	243,881		$	161,857		$	76,826		$	71,313		$	333,003	$	4,530	$	1,397,505
Current-period gross charge-offs	$	(24	)	$	(3,021	)	$	(5	)	$	(86	)	$	-		$	(600	)	$	-	$	-	$	(3,736	)
CRE
By internally assigned grade:
Pass	$	353,161		$	518,201		$	561,897		$	452,110		$	327,804		$	739,189		$	294,039	$	33,705	$	3,280,106
Special mention		3,577			4,472			10,711			7,055			9,967			39,460			2,970		-		78,212
Substandard		370			731			21,807			1,146			2,996			37,418			10,962		-		75,430
Total CRE	$	357,108		$	523,404		$	594,415		$	460,311		$	340,767		$	816,067		$	307,971	$	33,705	$	3,433,748
Current-period gross charge-offs	$	-		$	-		$	-		$	-		$	(114	)	$	(304	)	$	-	$	-	$	(418	)
Auto
By payment activity:
Performing	$	474,369		$	363,516		$	157,251		$	42,644		$	45,406		$	13,071		$	12	$	-	$	1,096,269
Nonperforming		532			1,241			830			190			306			74			-		-		3,173
Total auto	$	474,901		$	364,757		$	158,081		$	42,834		$	45,712		$	13,145		$	12	$	-	$	1,099,442
Current-period gross charge-offs	$	(102	)	$	(1,183	)	$	(1,066	)	$	(340	)	$	(301	)	$	(295	)	$	-	$	-	$	(3,287	)
Residential solar
By payment activity:
Performing	$	155,425		$	430,855		$	178,839		$	65,382		$	46,554		$	39,540		$	-	$	-	$	916,595
Nonperforming		-			837			205			18			47			53			-		-		1,160
Total residential solar	$	155,425		$	431,692		$	179,044		$	65,400		$	46,601		$	39,593		$	-	$	-	$	917,755
Current-period gross charge-offs	$	(150	)	$	(1,930	)	$	(923	)	$	(45	)	$	(558	)	$	(345	)	$	-	$	-	$	(3,951	)
Other consumer
By payment activity:
Performing	$	13,089		$	27,394		$	57,876		$	21,087		$	14,548		$	15,964		$	19,042	$	21	$	169,021
Nonperforming		-			244			685			144			56			161			4		45		1,339
Total other consumer	$	13,089		$	27,638		$	58,561		$	21,231		$	14,604		$	16,125		$	19,046	$	66	$	170,360
Current-period gross charge-offs	$	(885	)	$	(3,744	)	$	(7,511	)	$	(1,329	)	$	(832	)	$	(568	)	$	-	$	-	$	(14,869	)
Residential
By payment activity:
Performing	$	212,799		$	366,860		$	453,206		$	267,845		$	167,860		$	876,563		$	260,836	$	15,300	$	2,621,269
Nonperforming		134			430			1,121			385			591			7,460			-		513		10,634
Total residential	$	212,933		$	367,290		$	454,327		$	268,230		$	168,451		$	884,023		$	260,836	$	15,813	$	2,631,903
Current-period gross charge-offs	$	-		$	-		$	(81	)	$	(30	)	$	-		$	(406	)	$	-	$	-	$	(517	)
Total loans	$	1,444,621		$	1,989,711		$	1,688,309		$	1,019,863		$	692,961		$	1,840,266		$	920,868	$	54,114	$	9,650,713
Current-period gross charge-offs	$	(1,161	)	$	(9,878	)	$	(9,586	)	$	(1,830	)	$	(1,805	)	$	(2,518	)	$	-	$	-	$	(26,778	)

Amortized Cost Basis of Loans Modified to Borrowers Experiencing Financial Difficulty

	Three Months Ended June 30, 2024
	Term Extension						Combination - Term Extension and Interest Rate Reduction
(Dollars in thousands)	Amortized Cost			% of Total Class of Financing Receivables			Amortized Cost			% of Total Class of Financing Receivables
Residential		$	184		0.007	%		$	30		0.001	%
Total		$	184					$	30

	Three Months Ended June 30, 2023
	Term Extension						Combination - Term Extension and Interest Rate Reduction
(Dollars in thousands)	Amortized Cost			% of Total Class of Financing Receivables			Amortized Cost			% of Total Class of Financing Receivables
Residential		$	199		0.009	%		$	171		0.008	%
Total		$	199					$	171

	Six Months Ended June 30, 2024
	Term Extension						Combination - Term Extension and Interest Rate Reduction
(Dollars in thousands)	Amortized Cost			% of Total Class of Financing Receivables			Amortized Cost			% of Total Class of Financing Receivables
Residential		$	478		0.018	%		$	30		0.001	%
Total		$	478					$	30

	Six Months Ended June 30, 2023
	Term Extension						Combination - Term Extension and Interest Rate Reduction
(Dollars in thousands)	Amortized Cost			% of Total Class of Financing Receivables			Amortized Cost			% of Total Class of Financing Receivables
Residential		$	242		0.011	%		$	171		0.008	%
Total		$	242					$	171

Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty

The following table describes the financial effect of the modifications made to borrowers experiencing financial difficulties:

	Three Months Ended June 30, 2024
Loan Type	Term Extension	Interest Rate Reduction
Residential	Added a weighted-average 5.3 years to the life of loans, which reduced monthly payment amounts for the borrowers	Interest Rates were reduced by an average of one percent

	Three Months Ended June 30, 2023
Loan Type	Term Extension	Interest Rate Reduction
Residential	Added a weighted-average 10 years to the life of loans, which reduced monthly payment amounts for the borrowers	Interest Rates were reduced by an average of three and a half percent

	Six Months Ended June 30, 2024
Loan Type	Term Extension	Interest Rate Reduction
Residential	Added a weighted-average 6.3 years to the life of loans, which reduced monthly payment amounts for the borrowers	Interest Rates were reduced by an average of one percent

	Six Months Ended June 30, 2023
Loan Type	Term Extension	Interest Rate Reduction
Residential	Added a weighted-average 14 years to the life of loans, which reduced monthly payment amounts for the borrowers	Interest Rates were reduced by an average of three and a half percent

Financing Receivables with Payment Default that were Modified to Borrowers Experiencing Financial Difficulty

The following table depicts the financing receivables that had a payment default that were modified to borrowers experiencing financial difficulty in the previous 12 months:

	Three and Six Months Ended
	June 30, 2024
(In thousands)	Amortized Cost Basis of Modified Financing Receivables that Subsequently Defaulted
(In thousands)	Term Extension
Residential		$	171
Total		$	171

Performance of Modified Loans

The following table depicts the performance of loans that have been modified to borrowers experiencing financial difficulty that were modified in the prior twelve months:

	Payment Status (Amortized Cost Basis)
(In thousands)	Current		31-60 Days Past Due		61-90 Days Past Due		Greater than 90 Days Past Due
As of June 30, 2024
Residential	$	567	$	120	$	-	$	78
Total	$	567	$	120	$	-	$	78

Securities, Held to Maturity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	$ 878,909		$ 878,909		$ 905,267
Unrealized gains	78		78		271
Unrealized losses	(98,497)		(98,497)		(91,014)
Estimated fair value	780,490		780,490		814,524
Transactions of HTM securities [Abstract]
Gains from calls on HTM securities	0	$ 0	0	$ 0
Asset Pledged as Collateral [Member] \| Public Deposits or Other Purposes [Member]
Securities pledged [Abstract]
AFS and HTM securities	2,040,000		2,040,000		2,030,000
Asset Pledged as Collateral [Member] \| Securities Sold under Repurchase Agreements [Member]
Securities pledged [Abstract]
AFS and HTM securities	198,900		198,900		177,200
Federal Agency [Member]
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	100,000		100,000		100,000
Unrealized gains	0		0		0
Unrealized losses	(18,048)		(18,048)		(17,784)
Estimated fair value	81,952		81,952		82,216
Mortgage-Backed, Government Sponsored Enterprises [Member]
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	218,862		218,862		228,720
Unrealized gains	0		0		0
Unrealized losses	(34,162)		(34,162)		(31,613)
Estimated fair value	184,700		184,700		197,107
Mortgage-Backed, U.S. Government Agency Securities [Member]
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	16,733		16,733		17,086
Unrealized gains	1		1		3
Unrealized losses	(734)		(734)		(566)
Estimated fair value	16,000		16,000		16,523
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	177,833		177,833		187,457
Unrealized gains	0		0		57
Unrealized losses	(13,515)		(13,515)		(12,021)
Estimated fair value	164,318		164,318		175,493
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	62,490		62,490		63,878
Unrealized gains	0		0		0
Unrealized losses	(11,533)		(11,533)		(10,908)
Estimated fair value	50,957		50,957		52,970
State & Municipal [Member]
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	302,991		302,991		308,126
Unrealized gains	77		77		211
Unrealized losses	(20,505)		(20,505)		(18,122)
Estimated fair value	$ 282,563		$ 282,563		$ 290,215

Short-Term Borrowings

6 Months Ended

Jun. 30, 2024

Short-Term Borrowings [Abstract]

Short-Term Borrowings

7.	Short-Term Borrowings

In addition to the liquidity provided by balance sheet cash flows, liquidity must also be supplemented with additional sources such as credit lines from correspondent banks as well as borrowings from the FHLB and the Federal Reserve Bank. Other funding alternatives may also be appropriate from time to time, including wholesale and retail repurchase agreements and brokered CD accounts.

Information related to short-term borrowings is summarized as follows:

(In thousands)	June 30, 2024		December 31, 2023
Federal funds purchased	$	15,000	$	-
Securities sold under repurchase agreements		95,703		93,651
Other short-term borrowings		114,000		293,000
Total short-term borrowings	$	224,703	$	386,651

See Note 4 for additional information regarding securities pledged as collateral for securities sold under the repurchase agreements.

Allowance for Credit Losses and Credit Quality of Loans, Performance of Modified Loans (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Current [Member]
Performance of Modified Loans [Abstract]
Amortized cost	$ 567
31-60 Days Past Due [Member]
Performance of Modified Loans [Abstract]
Amortized cost	120
61-90 Days Past Due [Member]
Performance of Modified Loans [Abstract]
Amortized cost	0
Greater Than 90 Days Past Due [Member]
Performance of Modified Loans [Abstract]
Amortized cost	78
Residential [Member] \| Current [Member]
Performance of Modified Loans [Abstract]
Amortized cost	567
Residential [Member] \| 31-60 Days Past Due [Member]
Performance of Modified Loans [Abstract]
Amortized cost	120
Residential [Member] \| 61-90 Days Past Due [Member]
Performance of Modified Loans [Abstract]
Amortized cost	0
Residential [Member] \| Greater Than 90 Days Past Due [Member]
Performance of Modified Loans [Abstract]
Amortized cost	$ 78

Commitments and Contingencies

6 Months Ended

Jun. 30, 2024

Commitments and Contingencies [Abstract]

Commitments and Contingencies

13.	Commitments and Contingencies

The Company is a party to certain financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit, unused lines of credit, standby letters of credit and certain agricultural real estate loans sold to investors with recourse, with the sold portion having a government guarantee that is assignable back to the Company upon repurchase of the loan in the event of default. The Company’s exposure to credit loss in the event of nonperformance by the other party to the commitments to extend credit, unused lines of credit, standby letters of credit and loans sold with recourse is represented by the contractual amount of those instruments. The credit risk associated with commitments to extend credit and standby and commercial letters of credit is essentially the same as that involved with extending loans to customers and is subject to normal credit policies. Collateral may be obtained based on management’s assessment of the customer’s creditworthiness. Commitments to extend credit and unused lines of credit totaled $2.68 billion at June 30, 2024 and $2.25 billion at December 31, 2023.

Since many loan commitments, standby letters of credit and guarantees and indemnification contracts expire without being funded in whole or in part, the contract amounts are not necessarily indicative of future cash flows. The Company does not issue any guarantees that would require liability-recognition or disclosure, other than its standby letters of credit.

The Company guarantees the obligations or performance of customers by issuing standby letters of credit to third-parties. These standby letters of credit are generally issued in support of third-party debt, such as corporate debt issuances, industrial revenue bonds and municipal securities. The risk involved in issuing standby letters of credit is essentially the same as the credit risk involved in extending loan facilities to customers and letters of credit are subject to the same credit origination, portfolio maintenance and management procedures in effect to monitor other credit and off-balance sheet products. Typically, these instruments have one year expirations with an option to renew upon annual review; therefore, the total amounts do not necessarily represent future cash requirements. Standby letters of credit totaled $42.6 million at June 30, 2024 and $44.7 million at December 31, 2023. As of June 30, 2024 and December 31, 2023, the fair value of the Company’s standby letters of credit was not significant.

Allowance for Credit Losses and Credit Quality of Loans, Past Due Loans (Details) $ in Thousands	Jun. 30, 2024 USD ($) Relationship	Dec. 31, 2023 USD ($) Relationship
Allowance for Credit Losses and Credit Quality of Loans [Abstract]
Threshold balance for loans specifically evaluated for individual credit loss	$ 1,000
Individually evaluated loans, number of relationships \| Relationship	2	2
Individually evaluated loans, amortized cost	$ 17,100	$ 17,300
Individually evaluated loans, allowance for credit losses	1,700	0
Loans in non-accrual without an allowance for credit losses	1,800	17,300
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	34,755	34,213
Recorded total loans	9,854,347	9,650,713
Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	29,919	30,636
31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	20,245	20,585
61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	6,341	6,390
Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,333	3,661
Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	9,789,673	9,585,864
C&I [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,458,679	1,397,505
CRE [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,553,902	3,433,748
Auto [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,194,262	1,099,442
Residential Solar [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	861,883	917,755
Other Consumer [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	138,131	170,360
Commercial Loans [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	20,943	21,567
Recorded total loans	5,012,581	4,831,253
Commercial Loans [Member] \| Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,118	2,086
Commercial Loans [Member] \| 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,719	1,217
Commercial Loans [Member] \| 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,387	868
Commercial Loans [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	12	1
Commercial Loans [Member] \| Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,988,520	4,807,600
Commercial Loans [Member] \| C&I [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	2,586	3,441
Recorded total loans	1,458,679	1,397,505
Commercial Loans [Member] \| C&I [Member] \| Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,090	448
Commercial Loans [Member] \| C&I [Member] \| 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	929	414
Commercial Loans [Member] \| C&I [Member] \| 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,149	33
Commercial Loans [Member] \| C&I [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	12	1
Commercial Loans [Member] \| C&I [Member] \| Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,454,003	1,393,616
Commercial Loans [Member] \| CRE [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	18,357	18,126
Recorded total loans	3,553,902	3,433,748
Commercial Loans [Member] \| CRE [Member] \| Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,028	1,638
Commercial Loans [Member] \| CRE [Member] \| 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	790	803
Commercial Loans [Member] \| CRE [Member] \| 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	238	835
Commercial Loans [Member] \| CRE [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	0	0
Commercial Loans [Member] \| CRE [Member] \| Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,534,517	3,413,984
Consumer Loans [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	2,460	2,566
Recorded total loans	2,194,276	2,187,557
Consumer Loans [Member] \| Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	22,090	23,761
Consumer Loans [Member] \| 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	15,214	15,532
Consumer Loans [Member] \| 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,051	5,123
Consumer Loans [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,825	3,106
Consumer Loans [Member] \| Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,169,726	2,161,230
Consumer Loans [Member] \| Auto [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	2,079	2,106
Recorded total loans	1,194,262	1,099,442
Consumer Loans [Member] \| Auto [Member] \| Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	12,383	13,193
Consumer Loans [Member] \| Auto [Member] \| 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	9,653	10,115
Consumer Loans [Member] \| Auto [Member] \| 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,735	2,011
Consumer Loans [Member] \| Auto [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	995	1,067
Consumer Loans [Member] \| Auto [Member] \| Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,179,800	1,084,143
Consumer Loans [Member] \| Residential Solar [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	122	245
Recorded total loans	861,883	917,755
Consumer Loans [Member] \| Residential Solar [Member] \| Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	6,437	5,290
Consumer Loans [Member] \| Residential Solar [Member] \| 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,038	3,074
Consumer Loans [Member] \| Residential Solar [Member] \| 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,356	1,301
Consumer Loans [Member] \| Residential Solar [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,043	915
Consumer Loans [Member] \| Residential Solar [Member] \| Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	855,324	912,220
Consumer Loans [Member] \| Other Consumer [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	259	215
Recorded total loans	138,131	170,360
Consumer Loans [Member] \| Other Consumer [Member] \| Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,270	5,278
Consumer Loans [Member] \| Other Consumer [Member] \| 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,523	2,343
Consumer Loans [Member] \| Other Consumer [Member] \| 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	960	1,811
Consumer Loans [Member] \| Other Consumer [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	787	1,124
Consumer Loans [Member] \| Other Consumer [Member] \| Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	134,602	164,867
Residential [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	11,352	10,080
Recorded total loans	2,647,490	2,631,903
Residential [Member] \| Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,711	4,789
Residential [Member] \| 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,312	3,836
Residential [Member] \| 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	903	399
Residential [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	496	554
Residential [Member] \| Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	$ 2,631,427	$ 2,617,034

Securities (Tables)

6 Months Ended

Jun. 30, 2024

Securities [Abstract]

Amortized Cost, Estimated Fair Value and Unrealized Gains (Losses) of AFS Securities

The amortized cost, estimated fair value and unrealized gains (losses) of AFS securities are as follows:

(In thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
As of June 30, 2024
U.S. treasury	$	143,571	$	5	$	(8,266	)	$	135,310
Federal agency		248,366		-		(34,040	)		214,326
State & municipal		95,856		-		(9,854	)		86,002
Mortgage-backed:
Government-sponsored enterprises		375,011		1		(45,918	)		329,094
U.S. government agency securities		70,600		9		(7,371	)		63,238
Collateralized mortgage obligations:
Government-sponsored enterprises		477,441		71		(49,064	)		428,448
U.S. government agency securities		168,095		-		(27,055	)		141,040
Corporate		48,461		-		(6,474	)		41,987
Total AFS securities	$	1,627,401	$	86	$	(188,042	)	$	1,439,445
As of December 31, 2023
U.S. treasury	$	133,302	$	-	$	(8,278	)	$	125,024
Federal agency		248,384		-		(33,644	)		214,740
State & municipal		96,251		11		(9,956	)		86,306
Mortgage-backed:
Government-sponsored enterprises		399,532		7		(44,264	)		355,275
U.S. government agency securities		74,281		14		(7,302	)		66,993
Collateralized mortgage obligations:
Government-sponsored enterprises		452,715		15		(48,257	)		404,473
U.S. government agency securities		162,171		-		(25,100	)		137,071
Corporate		48,442		-		(7,466	)		40,976
Total AFS securities	$	1,615,078	$	47	$	(184,267	)	$	1,430,858

Amortized Cost, Estimated Fair Value and Unrealized Gains (Losses) of HTM Securities

The amortized cost, estimated fair value and unrealized gains (losses) of HTM securities are as follows:

(In thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
As of June 30, 2024
Federal agency	$	100,000	$	-	$	(18,048	)	$	81,952
Mortgage-backed:
Government-sponsored enterprises		218,862		-		(34,162	)		184,700
U.S. government agency securities		16,733		1		(734	)		16,000
Collateralized mortgage obligations:
Government-sponsored enterprises		177,833		-		(13,515	)		164,318
U.S. government agency securities		62,490		-		(11,533	)		50,957
State & municipal		302,991		77		(20,505	)		282,563
Total HTM securities	$	878,909	$	78	$	(98,497	)	$	780,490
As of December 31, 2023
Federal agency	$	100,000	$	-	$	(17,784	)	$	82,216
Mortgage-backed:
Government-sponsored enterprises		228,720		-		(31,613	)		197,107
U.S. government agency securities		17,086		3		(566	)		16,523
Collateralized mortgage obligations:
Government-sponsored enterprises		187,457		57		(12,021	)		175,493
U.S. government agency securities		63,878		-		(10,908	)		52,970
State & municipal		308,126		211		(18,122	)		290,215
Total HTM securities	$	905,267	$	271	$	(91,014	)	$	814,524

Gains and (Losses) on Equity Securities

The following tables set forth information with regard to gains and (losses) on equity securities:

	Three Months Ended June 30,
(In thousands)	2024			2023
Net (losses) recognized on equity securities	$	(92	)	$	(191	)
Less: Net (losses) recognized on equity securities sold during the period		-			-
Unrealized (losses) recognized on equity securities still held	$	(92	)	$	(191	)

	Six Months Ended June 30,
(In thousands)	2024			2023
Net (losses) recognized on equity securities	$	(193	)	$	(189	)
Less: Net (losses) recognized on equity securities sold during the period		-			-
Unrealized (losses) recognized on equity securities still held	$	(193	)	$	(189	)

Contractual Maturities of Debt Securities

The following table sets forth information with regard to contractual maturities of debt securities at June 30, 2024:

(In thousands)	Amortized Cost		Estimated Fair Value
AFS debt securities:
Within one year	$	56,084	$	55,606
From one to five years		579,028		521,402
From five to ten years		305,590		269,587
After ten years		686,699		592,850
Total AFS debt securities	$	1,627,401	$	1,439,445
HTM debt securities:
Within one year	$	102,069	$	101,871
From one to five years		120,724		114,731
From five to ten years		244,994		212,360
After ten years		411,122		351,528
Total HTM debt securities	$	878,909	$	780,490

Investment Securities with Unrealized Losses

	Less Than 12 Months							12 Months or Longer							Total
(In thousands)	Fair Value		Unrealized Losses			Number of Positions		Fair Value		Unrealized Losses			Number of Positions		Fair Value		Unrealized Losses			Number of Positions
As of June 30, 2024
AFS securities:
U.S. treasury	$	4,976	$	(6	)		1	$	115,324	$	(8,260	)		7	$	120,300	$	(8,266	)		8
Federal agency		-		-			-		214,326		(34,040	)		16		214,326		(34,040	)		16
State & municipal		758		(7	)		1		85,244		(9,847	)		66		86,002		(9,854	)		67
Mortgage-backed		284		(3	)		6		391,446		(53,286	)		157		391,730		(53,289	)		163
Collateralized mortgage obligations		26,485		(118	)		3		510,558		(76,001	)		120		537,043		(76,119	)		123
Corporate		1,448		(22	)		1		40,539		(6,452	)		14		41,987		(6,474	)		15
Total securities with unrealized losses	$	33,951	$	(156	)		12	$	1,357,437	$	(187,886	)		380	$	1,391,388	$	(188,042	)		392
HTM securities:
Federal agency	$	-	$	-			-	$	81,952	$	(18,048	)		4	$	81,952	$	(18,048	)		4
Mortgage-backed		-		-			-		200,630		(34,896	)		34		200,630		(34,896	)		34
Collateralized mortgage obligation		7,822		(84	)		1		207,453		(24,964	)		52		215,275		(25,048	)		53
State & municipal		6,557		(83	)		6		178,192		(20,422	)		203		184,749		(20,505	)		209
Total securities with unrealized losses	$	14,379	$	(167	)		7	$	668,227	$	(98,330	)		293	$	682,606	$	(98,497	)		300

As of December 31, 2023
AFS securities:
U.S. treasury	$	-	$	-			-	$	125,024	$	(8,278	)		8	$	125,024	$	(8,278	)		8
Federal agency		-		-			-		214,740		(33,644	)		16		214,740		(33,644	)		16
State & municipal		-		-			-		85,528		(9,956	)		66		85,528		(9,956	)		66
Mortgage-backed		53		(1	)		7		421,259		(51,565	)		156		421,312		(51,566	)		163
Collateralized mortgage obligations		1,333		(6	)		2		536,678		(73,351	)		118		538,011		(73,357	)		120
Corporate		1,379		(75	)		1		39,597		(7,391	)		14		40,976		(7,466	)		15
Total securities with unrealized losses	$	2,765	$	(82	)		10	$	1,422,826	$	(184,185	)		378	$	1,425,591	$	(184,267	)		388
HTM securities:
Federal agency	$	-	$	-			-	$	82,216	$	(17,784	)		4	$	82,216	$	(17,784	)		4
Mortgage-backed		12,221		(365	)		1		201,320		(31,814	)		33		213,541		(32,179	)		34
Collateralized mortgage obligations		-		-			-		219,820		(22,929	)		54		219,820		(22,929	)		54
State & municipal		14,422		(127	)		21		171,904		(17,995	)		189		186,326		(18,122	)		210
Total securities with unrealized losses	$	26,643	$	(492	)		22	$	675,260	$	(90,522	)		280	$	701,903	$	(91,014	)		302

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

+ Details

- Definition

Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5A

Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5A

Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5A

Reference 15: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B

Reference 16: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B

Reference 17: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B

Reference 18: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B

+ Details

Securities, Gains and (Losses) on Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Gains (losses) on equity securities [Abstract]
Net (losses) recognized on equity securities	$ (92)	$ (191)	$ (193)	$ (189)
Less: Net (losses) recognized on equity securities sold during the period	0	0	0	0
Unrealized (losses) recognized on equity securities still held	(92)	(191)	(193)	(189)
Equity Securities without Readily Determinable Fair Value, Annual Amount [Abstract]
Carrying amount of equity securities without readily determinable fair values	1,000		1,000		$ 1,000
Impairment adjustments of equity securities without readily determinable fair values	0	0	0	0
Downward adjustments of equity securities without readily determinable fair values	0	0	0	0
Upward adjustments of equity securities without readily determinable fair values	$ 0	$ 0	$ 0	$ 0

Earnings Per Share (Policies)	6 Months Ended
Earnings Per Share (Policies)	Jun. 30, 2024
Earnings Per Share [Abstract]
Earnings Per Share	Basic EPS excludes dilution and is computed by dividing income available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity (such as the Company’s dilutive stock options and restricted stock units).

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating activities
Net income	$ 66,539	$ 63,730
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	14,478	7,515
Depreciation and amortization of premises and equipment	5,721	5,145
Net amortization on securities	1,305	1,392
Amortization of intangible assets	4,301	994
Amortization of operating lease right-of-use assets	3,729	3,278
Excess tax benefit on stock-based compensation	(135)	(241)
Stock-based compensation expense	4,191	3,312
Bank owned life insurance income	(4,186)	(3,406)
Amortization of subordinated debt issuance costs	219	218
Proceeds from sale of loans held for sale	51,664	12,550
Originations of loans held for sale	(51,139)	(13,476)
Net gain on sale of loans held for sale	(72)	(62)
Net securities (gains) losses	(2,091)	9,639
Net change in other assets and other liabilities	(7,261)	(23,417)
Net cash provided by operating activities	87,263	67,171
Investing activities
Net cash used in acquisitions	(743)	(2,213)
Securities available for sale:
Proceeds from maturities, calls and principal paydowns	54,196	59,168
Proceeds from sales	2,284	2,550
Purchases	(66,970)	0
Securities held to maturity:
Proceeds from maturities, calls and principal paydowns	85,547	52,554
Purchases	(59,856)	(46,559)
Equity securities:
Purchases	(16)	0
Other:
Net increase in loans	(212,351)	(215,634)
Proceeds from Federal Home Loan Bank stock redemption	51,481	65,923
Purchases of Federal Reserve and Federal Home Loan Bank stock	(43,934)	(74,286)
Proceeds from settlement of bank owned life insurance	608	2,415
Purchases of premises and equipment, net	(3,804)	(2,876)
Net cash used in investing activities	(193,558)	(158,958)
Financing activities
Net increase in deposits	302,465	33,986
Net (decrease) increase in short-term borrowings	(161,948)	67,401
Proceeds from long-term debt	0	25,000
Repayments of long-term debt	(75)	(51)
Cash paid by employer for tax-withholding on stock issuance	(1,382)	(1,488)
Purchase of treasury stock	(251)	(2,778)
Cash dividends	(30,183)	(25,745)
Net cash provided by financing activities	108,626	96,325
Net increase in cash and cash equivalents	2,331	4,538
Cash and cash equivalents at beginning of period	205,189	197,350
Cash and cash equivalents at end of period	207,520	201,888
Cash paid during the period for:
Interest expense	108,183	40,751
Income taxes paid, net of refund	9,213	21,318
Noncash investing activities:
Loans transferred to other real estate owned	74	74
Acquisitions:
Fair value of assets acquired	$ 693	$ 150

Short-Term Borrowings (Tables)

6 Months Ended

Jun. 30, 2024

Short-Term Borrowings [Abstract]

Information related to short-term borrowings is summarized as follows:

(In thousands)	June 30, 2024		December 31, 2023
Federal funds purchased	$	15,000	$	-
Securities sold under repurchase agreements		95,703		93,651
Other short-term borrowings		114,000		293,000
Total short-term borrowings	$	224,703	$	386,651

Earnings Per Share

6 Months Ended

Jun. 30, 2024

Earnings Per Share [Abstract]

Earnings Per Share

9.	Earnings Per Share

Basic EPS excludes dilution and is computed by dividing income available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity (such as the Company’s dilutive stock options and restricted stock units).

The following is a reconciliation of basic and diluted EPS for the periods presented in the unaudited interim consolidated statements of income:

	Three Months Ended June 30,
(In thousands, except per share data)	2024		2023
Basic EPS:
Weighted average common shares outstanding		47,158		42,905
Net income available to common stockholders	$	32,716	$	30,072
Basic EPS	$	0.69	$	0.70

Diluted EPS:
Weighted average common shares outstanding		47,158		42,905
Dilutive effect of common stock options and restricted stock		225		221
Weighted average common shares and common share equivalents		47,383		43,126
Net income available to common stockholders	$	32,716	$	30,072
Diluted EPS	$	0.69	$	0.70

Anti-dilutive stock options and restricted stock outstanding		2		61

	Six Months Ended June 30,
(In thousands, except per share data)	2024		2023
Basic EPS:
Weighted average common shares outstanding		47,153		42,900
Net income available to common stockholders	$	66,539	$	63,730
Basic EPS	$	1.41	$	1.49

Diluted EPS:
Weighted average common shares outstanding		47,153		42,900
Dilutive effect of common stock options and restricted stock		228		229
Weighted average common shares and common share equivalents		47,381		43,129
Net income available to common stockholders	$	66,539	$	63,730
Diluted EPS	$	1.40	$	1.48

Anti-dilutive stock options and restricted stock outstanding		2		24

Fair Value Measurements and Fair Value of Financial Instruments, Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financial assets [Abstract]
HTM securities	$ 780,490	$ 814,524
Carrying Amount [Member] \| Level 1 [Member]
Financial liabilities [Abstract]
Subordinated debt	120,880	120,380
Carrying Amount [Member] \| Level 2 [Member]
Financial assets [Abstract]
HTM securities	878,909	905,267
Financial liabilities [Abstract]
Time deposits	1,404,797	1,324,709
Long-term debt	29,721	29,796
Junior subordinated debt	101,196	101,196
Carrying Amount [Member] \| Level 3 [Member]
Financial assets [Abstract]
Net loans	9,737,030	9,539,684
Estimated Fair Value [Member] \| Level 1 [Member]
Financial liabilities [Abstract]
Subordinated debt	113,768	113,757
Estimated Fair Value [Member] \| Level 2 [Member]
Financial assets [Abstract]
HTM securities	780,490	814,524
Financial liabilities [Abstract]
Time deposits	1,384,422	1,285,999
Long-term debt	29,531	29,416
Junior subordinated debt	103,563	102,337
Estimated Fair Value [Member] \| Level 3 [Member]
Financial assets [Abstract]
Net loans	$ 9,366,639	$ 9,216,162

Defined Benefit Post-Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Defined Benefit Post-Retirement Plans [Abstract]
Employer contributions	$ 0	$ 0	$ 0	$ 0
Pension Benefits [Member]
Components of net periodic (benefit) cost [Abstract]
Service cost	513	482	1,027	964
Interest cost	1,006	1,010	2,011	2,020
Expected return on plan assets	(1,982)	(1,853)	(3,965)	(3,706)
Net amortization	1,452	670	1,905	1,340
Total net periodic cost (benefit)	989	309	978	618
Other Benefits [Member]
Components of net periodic (benefit) cost [Abstract]
Service cost	1	1	2	2
Interest cost	55	56	110	112
Expected return on plan assets	0	0	0	0
Net amortization	(1)	(21)	(2)	(42)
Total net periodic cost (benefit)	$ 55	$ 36	$ 110	$ 72

Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Summary of Loans [Abstract]
Loans	$ 9,854,347	$ 9,650,713
Deferred loan origination (fees) costs, net	80,900	98,200
Commercial and Industrial [Member]
Summary of Loans [Abstract]
Loans	1,397,935	1,354,248
Commercial Real Estate [Member]
Summary of Loans [Abstract]
Loans	3,784,214	3,626,910
Residential Real Estate [Member]
Summary of Loans [Abstract]
Loans	2,134,875	2,125,804
Home Equity [Member]
Summary of Loans [Abstract]
Loans	326,556	337,214
Indirect Auto [Member]
Summary of Loans [Abstract]
Loans	1,225,786	1,130,132
Residential Solar [Member]
Summary of Loans [Abstract]
Loans	861,883	917,755
Other Consumer [Member]
Summary of Loans [Abstract]
Loans	$ 123,098	$ 158,650

Description of Business (Details) - Salisbury Bank [Member] $ in Millions	Aug. 11, 2023 USD ($) Office
Acquisition of Salisbury Bancorp, Inc. [Abstract]
Assets acquired \| $	$ 1,460
Number of banking offices \| Office	13

Defined Benefit Post-Retirement Plans (Policies)	6 Months Ended
Defined Benefit Post-Retirement Plans (Policies)	Jun. 30, 2024
Defined Benefit Post-Retirement Plans [Abstract]
Postemployment Benefit Plans, Policy	The Company has a qualified, noncontributory, defined benefit pension plan (the “Plan”) covering substantially all of its employees at June 30, 2024. Benefits paid from the Plan are based on age, years of service, compensation and social security benefits and are determined in accordance with defined formulas. The Company’s policy is to fund the Plan in accordance with Employee Retirement Income Security Act of 1974 standards. Assets of the Plan are invested in publicly traded stocks, bonds and mutual funds. In addition to the Plan, the Company provides supplemental employee retirement plans to certain current and former executives. These supplemental employee retirement plans and the Plan are collectively referred to herein as “Pension Benefits.” In addition, the Company provides certain health care benefits for retired employees. Benefits were accrued over the employees’ active service period. Only employees that were employed by the Company on or before January 1, 2000 are eligible to receive post-retirement health care benefits. These post-retirement benefits are referred to herein as “Other Benefits.” Accounting standards require an employer to: (1) recognize the overfunded or underfunded status of defined benefit post-retirement plans, which is measured as the difference between plan assets at fair value and the benefit obligation, as an asset or liability in its balance sheet; (2) recognize changes in that funded status in the year in which the changes occur through comprehensive income; and (3) measure the defined benefit plan assets and obligations as of the date of its year-end balance sheet.

Consolidated Statements of Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest, fee and dividend income
Interest and fees on loans	$ 136,606	$ 106,935	$ 269,752	$ 207,834
Securities available for sale	7,562	7,493	14,686	15,109
Securities held to maturity	5,190	4,991	10,493	10,026
Other	1,408	1,170	2,772	1,812
Total interest, fee and dividend income	150,766	120,589	297,703	234,781
Interest expense
Deposits	46,688	19,986	91,027	31,130
Short-term borrowings	2,899	8,126	6,320	13,045
Long-term debt	291	290	581	337
Subordinated debt	1,806	1,335	3,606	2,669
Junior subordinated debt	1,908	1,767	3,821	3,449
Total interest expense	53,592	31,504	105,355	50,630
Net interest income	97,174	89,085	192,348	184,151
Provision for loan losses	8,899	3,606	14,478	7,515
Net interest income after provision for loan losses	88,275	85,479	177,870	176,636
Noninterest income
Service charges on deposit accounts	4,219	3,733	8,336	7,281
Card services income	5,587	5,121	10,782	9,966
Retirement plan administration fees	14,798	11,735	29,085	23,197
Wealth management	10,173	8,227	19,870	16,314
Insurance services	3,848	3,716	8,236	7,647
Bank owned life insurance income	1,834	1,528	4,186	3,406
Net securities (losses) gains	(92)	(4,641)	2,091	(9,639)
Other	2,865	2,626	6,038	5,282
Total noninterest income	43,232	32,045	88,624	63,454
Noninterest expense
Salaries and employee benefits	55,393	46,834	111,097	94,989
Technology and data services	9,249	9,305	18,999	18,312
Occupancy	7,671	6,923	15,769	14,143
Professional fees and outside services	4,565	4,159	9,418	8,337
Office supplies and postage	1,804	1,676	3,669	3,304
FDIC assessment	1,667	1,344	3,402	2,740
Advertising	873	525	1,685	1,174
Amortization of intangible assets	2,133	458	4,301	994
Loan collection and other real estate owned, net	715	691	1,268	1,546
Acquisition expenses	0	1,189	0	1,807
Other	5,518	5,690	11,753	10,770
Total noninterest expense	89,588	78,794	181,361	158,116
Income before income tax expense	41,919	38,730	85,133	81,974
Income tax expense	9,203	8,658	18,594	18,244
Net income	$ 32,716	$ 30,072	$ 66,539	$ 63,730
Earnings per share
Basic (in dollars per share)	$ 0.69	$ 0.7	$ 1.41	$ 1.49
Diluted (in dollars per share)	$ 0.69	$ 0.7	$ 1.4	$ 1.48

Securities, HTM Debt Securities, Contractual Maturities (Details) $ in Thousands	Jun. 30, 2024 USD ($) Issuer	Dec. 31, 2023 USD ($) Issuer
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	$ 102,069
From one to five years	120,724
From five to ten years	244,994
After ten years	411,122
Amortized cost	878,909	$ 905,267
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	101,871
From one to five years	114,731
From five to ten years	212,360
After ten years	351,528
Fair value	$ 780,490	$ 814,524
Number of issuers whose holdings exceeded 10% of consolidated stockholders' equity, excluding U.S. Government securities and Government-sponsored enterprises securities \| Issuer	0	0

Fair Value Measurements and Fair Value of Financial Instruments, Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
AFS securities [Abstract]
AFS securities	$ 1,439,445	$ 1,430,858
Equity securities	$ 40,087	37,591
Minimum [Member]
Fair Value Measurements [Abstract]
Liquidation expense ratio on impaired collateral	10.00%
Maximum [Member]
Fair Value Measurements [Abstract]
Liquidation expense ratio on impaired collateral	50.00%
U.S. Treasury [Member]
AFS securities [Abstract]
AFS securities	$ 135,310	125,024
Federal Agency [Member]
AFS securities [Abstract]
AFS securities	214,326	214,740
State & Municipal [Member]
AFS securities [Abstract]
AFS securities	86,002	86,306
Corporate [Member]
AFS securities [Abstract]
AFS securities	41,987	40,976
Recurring Basis [Member]
AFS securities [Abstract]
AFS securities	1,439,445	1,430,858
Equity securities	40,087	37,591
Derivatives	$ 91,186	$ 75,142
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Total	$ 1,570,718	$ 1,543,591
Liabilities [Abstract]
Derivatives	$ 115,664	$ 95,875
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Total	$ 115,664	$ 95,875
Recurring Basis [Member] \| Level 1 [Member]
AFS securities [Abstract]
AFS securities	135,310	125,024
Equity securities	39,087	36,591
Derivatives	0	0
Total	174,397	161,615
Liabilities [Abstract]
Derivatives	0	0
Total	0	0
Recurring Basis [Member] \| Level 2 [Member]
AFS securities [Abstract]
AFS securities	1,304,135	1,305,834
Equity securities	1,000	1,000
Derivatives	91,186	75,142
Total	1,396,321	1,381,976
Liabilities [Abstract]
Derivatives	115,664	95,875
Total	115,664	95,875
Recurring Basis [Member] \| Level 3 [Member]
AFS securities [Abstract]
AFS securities	0	0
Equity securities	0	0
Derivatives	0	0
Total	0	0
Liabilities [Abstract]
Derivatives	0	0
Total	0	0
Recurring Basis [Member] \| U.S. Treasury [Member]
AFS securities [Abstract]
AFS securities	135,310	125,024
Recurring Basis [Member] \| U.S. Treasury [Member] \| Level 1 [Member]
AFS securities [Abstract]
AFS securities	135,310	125,024
Recurring Basis [Member] \| U.S. Treasury [Member] \| Level 2 [Member]
AFS securities [Abstract]
AFS securities	0	0
Recurring Basis [Member] \| U.S. Treasury [Member] \| Level 3 [Member]
AFS securities [Abstract]
AFS securities	0	0
Recurring Basis [Member] \| Federal Agency [Member]
AFS securities [Abstract]
AFS securities	214,326	214,740
Recurring Basis [Member] \| Federal Agency [Member] \| Level 1 [Member]
AFS securities [Abstract]
AFS securities	0	0
Recurring Basis [Member] \| Federal Agency [Member] \| Level 2 [Member]
AFS securities [Abstract]
AFS securities	214,326	214,740
Recurring Basis [Member] \| Federal Agency [Member] \| Level 3 [Member]
AFS securities [Abstract]
AFS securities	0	0
Recurring Basis [Member] \| State & Municipal [Member]
AFS securities [Abstract]
AFS securities	86,002	86,306
Recurring Basis [Member] \| State & Municipal [Member] \| Level 1 [Member]
AFS securities [Abstract]
AFS securities	0	0
Recurring Basis [Member] \| State & Municipal [Member] \| Level 2 [Member]
AFS securities [Abstract]
AFS securities	86,002	86,306
Recurring Basis [Member] \| State & Municipal [Member] \| Level 3 [Member]
AFS securities [Abstract]
AFS securities	0	0
Recurring Basis [Member] \| Mortgage-Backed [Member]
AFS securities [Abstract]
AFS securities	392,332	422,268
Recurring Basis [Member] \| Mortgage-Backed [Member] \| Level 1 [Member]
AFS securities [Abstract]
AFS securities	0	0
Recurring Basis [Member] \| Mortgage-Backed [Member] \| Level 2 [Member]
AFS securities [Abstract]
AFS securities	392,332	422,268
Recurring Basis [Member] \| Mortgage-Backed [Member] \| Level 3 [Member]
AFS securities [Abstract]
AFS securities	0	0
Recurring Basis [Member] \| Collateralized Mortgage Obligations [Member]
AFS securities [Abstract]
AFS securities	569,488	541,544
Recurring Basis [Member] \| Collateralized Mortgage Obligations [Member] \| Level 1 [Member]
AFS securities [Abstract]
AFS securities	0	0
Recurring Basis [Member] \| Collateralized Mortgage Obligations [Member] \| Level 2 [Member]
AFS securities [Abstract]
AFS securities	569,488	541,544
Recurring Basis [Member] \| Collateralized Mortgage Obligations [Member] \| Level 3 [Member]
AFS securities [Abstract]
AFS securities	0	0
Recurring Basis [Member] \| Corporate [Member]
AFS securities [Abstract]
AFS securities	41,987	40,976
Recurring Basis [Member] \| Corporate [Member] \| Level 1 [Member]
AFS securities [Abstract]
AFS securities	0	0
Recurring Basis [Member] \| Corporate [Member] \| Level 2 [Member]
AFS securities [Abstract]
AFS securities	41,987	40,976
Recurring Basis [Member] \| Corporate [Member] \| Level 3 [Member]
AFS securities [Abstract]
AFS securities	0	0
Non-Recurring Basis [Member]
Fair Value Measurements [Abstract]
Loans individually evaluated for expected credit losses, fair value	$ 1,700	$ 0

Allowance for Credit Losses and Credit Quality of Loans, Allowance for Credit Losses on Off-Balance Sheet Credit Exposures (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023
Allowance for Credit Losses and Credit Quality of Loans [Abstract]
Allowance for credit losses	$ 120,500	$ 115,300	$ 114,400	$ 100,400	$ 100,250
Unfunded Commitment [Member]
Allowance for Credit Losses and Credit Quality of Loans [Abstract]
Allowance for credit losses	$ 4,300		$ 5,100

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References + Details

Allowance for Credit Losses and Credit Quality of Loans, Allowance for Credit Losses by Portfolio Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	$ 115,300	$ 100,250	$ 114,400
Charge-offs	(5,627)	(5,149)	(12,307)		$ (26,778)
Recoveries	1,928	1,693	3,929
Provision	8,899	3,606	14,478	$ 7,515
Balance, end of period	120,500	100,400	120,500	100,400	114,400
ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period				100,152	100,152
Charge-offs				(10,999)
Recoveries				3,732
Provision				7,515
Balance, end of period		100,400		100,400
Commercial Loans [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	44,472	36,040	45,903
Charge-offs	(299)	(207)	(1,284)
Recoveries	292	97	490
Provision	2,243	1,033	1,599
Balance, end of period	46,708	36,963	46,708	36,963	45,903
Commercial Loans [Member] \| ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period				34,662	34,662
Charge-offs				(376)
Recoveries				638
Provision				2,039
Balance, end of period		36,963		36,963
Consumer Loans [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	47,419	48,820	46,427
Charge-offs	(5,328)	(4,837)	(10,909)
Recoveries	1,559	1,441	3,210
Provision	4,268	2,459	9,190
Balance, end of period	47,918	47,883	47,918	47,883	46,427
Consumer Loans [Member] \| ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period				50,951	50,951
Charge-offs				(10,179)
Recoveries				2,818
Provision				4,293
Balance, end of period		47,883		47,883
Residential [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	23,409	15,390	22,070
Charge-offs	0	(105)	(114)		(517)
Recoveries	77	155	229
Provision	2,388	114	3,689
Balance, end of period	$ 25,874	15,554	$ 25,874	15,554	22,070
Residential [Member] \| ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period				14,539	$ 14,539
Charge-offs				(444)
Recoveries				276
Provision				1,183
Balance, end of period		$ 15,554		$ 15,554

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References + Details