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Document and Entity Information - shares	6 Months Ended
Jun. 30, 2016	Jul. 31, 2016
Document And Entity Information [Abstract]
Entity Registrant Name	NBT BANCORP INC
Entity Central Index Key	0000790359
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		43,069,068
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016

Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 151,775	$ 130,593
Short-term interest bearing accounts	19,828	9,704
Securities available for sale, at fair value	1,271,596	1,174,544
Securities held to maturity (fair value $512,349 and $473,140, respectively)	500,840	471,031
Trading securities	8,591	8,377
Federal Reserve and Federal Home Loan Bank stock	45,260	36,673
Loans	6,039,393	5,883,133
Less allowance for loan losses	64,568	63,018
Net loans	5,974,825	5,820,115
Premises and equipment, net	84,596	88,826
Goodwill	265,957	265,957
Intangible assets, net	15,241	17,265
Bank owned life insurance	163,149	117,044
Other assets	123,122	122,517
Total assets	8,624,780	8,262,646
Liabilities
Demand (noninterest bearing)	2,031,078	1,998,165
Savings, NOW, and money market	3,826,626	3,697,851
Time	882,712	908,827
Total deposits	6,740,416	6,604,843
Short-term borrowings	666,424	442,481
Long-term debt	110,306	130,447
Junior subordinated debt	101,196	101,196
Other liabilities	110,085	101,675
Total liabilities	7,728,427	7,380,642
Stockholders' equity
Preferred stock, $0.01 par value. Authorized 2,500,000 shares at June 30, 2016 and December 31, 2015	0	0
Common stock, $0.01 par value. Authorized 100,000,000 shares at June 30, 2016 and December 31, 2015; issued 49,651,494 at June 30, 2016 and December 31, 2015	497	497
Additional paid-in-capital	573,067	576,726
Retained earnings	482,074	462,232
Accumulated other comprehensive loss	(11,147)	(22,418)
Common stock in treasury, at cost, 6,658,554 and 6,220,792 shares at June 30, 2016 and December 31, 2015, respectively	(148,138)	(135,033)
Total stockholders' equity	896,353	882,004
Total liabilities and stockholders' equity	$ 8,624,780	$ 8,262,646

Consolidated Statements of Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest, fee, and dividend income
Interest and fees on loans	$ 62,449	$ 59,873	$ 123,679	$ 119,391
Securities available for sale	5,976	5,144	11,963	10,089
Securities held to maturity	2,496	2,315	4,784	4,598
Other	454	395	903	875
Total interest, fee, and dividend income	71,375	67,727	141,329	134,953
Interest expense
Deposits	3,605	3,517	7,202	7,090
Short-term borrowings	579	144	907	265
Long-term debt	773	836	1,606	1,662
Junior subordinated debt	641	545	1,260	1,085
Total interest expense	5,598	5,042	10,975	10,102
Net interest income	65,777	62,685	130,354	124,851
Provision for loan losses	4,780	3,898	10,878	7,540
Net interest income after provision for loan losses	60,997	58,787	119,476	117,311
Noninterest income
Insurance and other financial services revenue	5,625	5,836	12,571	12,210
Service charges on deposit accounts	4,166	4,285	8,105	8,357
ATM and debit card fees	4,934	4,679	9,517	8,927
Retirement plan administration fees	4,054	3,566	7,808	6,762
Trust	4,937	5,196	9,313	9,646
Bank owned life insurance	1,271	928	2,562	2,487
Net securities gains	1	26	30	40
Other	4,626	3,699	8,075	6,320
Total noninterest income	29,614	28,215	57,981	54,749
Noninterest expense
Salaries and employee benefits	32,931	30,831	65,372	61,013
Occupancy	5,254	5,412	10,745	11,478
Data processing and communications	4,121	4,288	8,171	8,391
Professional fees and outside services	3,331	3,395	6,562	6,892
Equipment	3,547	3,316	7,007	6,565
Office supplies and postage	1,676	1,627	3,223	3,246
FDIC expenses	1,293	1,280	2,551	2,478
Advertising	595	734	1,099	1,453
Amortization of intangible assets	928	1,187	2,024	2,471
Loan collection and other real estate owned, net	845	22	1,550	894
Other	5,924	5,872	10,365	10,785
Total noninterest expense	60,445	57,964	118,669	115,666
Income before income tax expense	30,166	29,038	58,788	56,394
Income tax expense	10,257	9,757	19,988	18,947
Net income	$ 19,909	$ 19,281	$ 38,800	$ 37,447
Earnings per share
Basic (in dollars per share)	$ 0.46	$ 0.44	$ 0.90	$ 0.85
Diluted (in dollars per share)	$ 0.46	$ 0.43	$ 0.89	$ 0.84

Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net income	$ 19,909	$ 19,281	$ 38,800	$ 37,447
Other comprehensive income (loss), net of tax:
Unrealized net holding gains (losses) arising during the period (pre-tax amounts of $3,730, ($5,277), $16,941 and ($434))	2,278	(3,223)	10,350	(266)
Reclassification adjustment for net gains related to securities available for sale included in net income (pre-tax amounts of $1, $26, $30 and $40)	0	(16)	(19)	(24)
Unrealized losses on derivatives (cash flow hedges) (pre-tax amounts of ($62), $0, ($62) and $0)	(38)	0	(38)	0
Amortization of unrealized net gains and losses related to the reclassification of available for sale investment securities to held to maturity (pre-tax amounts of $280, $336, $576 and $671)	171	205	352	410
Pension and other benefits:
Amortization of prior service cost and actuarial gains (pre-tax amounts of $513, $561, $1,024 and $1,122)	313	342	626	684
Total other comprehensive income (loss)	2,724	(2,692)	11,271	804
Comprehensive income	$ 22,633	$ 16,589	$ 50,071	$ 38,251

Consolidated Statements of 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
Beginning Balance at Dec. 31, 2014	$ 497	$ 576,504	$ 423,956	$ (17,027)	$ (119,749)	$ 864,181
Net income	0	0	37,447	0	0	37,447
Cash dividends	0	0	(18,957)	0	0	(18,957)
Purchases of treasury shares	0	0	0	0	(10,672)	(10,672)
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit	0	(3,568)	0	0	4,060	492
Stock-based compensation	0	2,676	0	0	0	2,676
Other comprehensive income	0	0	0	804	0	804
Ending Balance at Jun. 30, 2015	497	575,612	442,446	(16,223)	(126,361)	875,971
Beginning Balance at Dec. 31, 2015	497	576,726	462,232	(22,418)	(135,033)	882,004
Net income	0	0	38,800	0	0	38,800
Cash dividends	0	0	(18,958)	0	0	(18,958)
Purchases of treasury shares	0	0	0	0	(17,193)	(17,193)
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit	0	(5,945)	0	0	4,088	(1,857)
Stock-based compensation	0	2,286	0	0	0	2,286
Other comprehensive income	0	0	0	11,271	0	11,271
Ending Balance at Jun. 30, 2016	$ 497	$ 573,067	$ 482,074	$ (11,147)	$ (148,138)	$ 896,353

- Definition

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

+ References + Details

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities
Net income	$ 38,800	$ 37,447
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	10,878	7,540
Depreciation and amortization of premises and equipment	4,511	4,277
Net accretion on securities	1,816	1,157
Amortization of intangible assets	2,024	2,471
Stock based compensation	2,286	2,676
Bank owned life insurance income	(2,562)	(2,487)
Purchases of trading securities	(270)	(649)
Losses (gains) on trading securities	56	(26)
Proceeds from sales of loans held for sale	44,598	24,743
Originations and purchases of loans held for sale	(47,298)	(26,051)
Net gains on sales of loans held for sale	(227)	(103)
Net security gains	(30)	(40)
Net gain on sales of other real estate owned	(528)	(1,079)
Net (increase) decrease in other assets	(6,890)	11,647
Net increase (decrease) in other liabilities	2,892	(6,152)
Net cash provided by operating activities	50,056	55,371
Securities available for sale:
Proceeds from maturities, calls, and principal paydowns	161,017	125,278
Purchases	(238,610)	(242,304)
Securities held to maturity:
Proceeds from maturities, calls, and principal paydowns	41,440	42,950
Purchases	(70,065)	(41,448)
Other:
Net increase in loans	(164,269)	(185,349)
Proceeds from FHLB stock redemption	64,194	19,085
Purchases of Federal Reserve and FHLB stock	(72,781)	(25,118)
Proceeds from settlement of bank owned life insurance	1,457	1,497
Purchase of bank owned life insurance	(45,000)	0
Purchases of premises and equipment	(2,083)	(2,671)
Proceeds from the sales of other real estate owned	4,583	2,597
Net cash used in investing activities	(320,117)	(305,483)
Financing activities
Net increase in deposits	135,573	71,874
Net increase in short-term borrowings	223,943	195,190
Repayments of long-term debt	(20,141)	(240)
Proceeds from the issuance of shares to employee benefit plans and other stock plans	(1,857)	492
Purchase of treasury stock	(17,193)	(10,672)
Cash dividends	(18,958)	(18,957)
Net cash provided by financing activities	301,367	237,687
Net increase (decrease) in cash and cash equivalents	31,306	(12,425)
Cash and cash equivalents at beginning of period	140,297	146,636
Cash and cash equivalents at end of period	171,603	134,211
Cash paid during the period for:
Interest	10,926	10,628
Income taxes paid	20,809	9,027
Noncash investing activities:
Loans transferred to other real estate owned	$ 1,608	$ 2,203

Securities

6 Months Ended

Jun. 30, 2016

Securities [Abstract]

Securities

Note 3.

Securities

The amortized cost, estimated fair value, and unrealized gains and losses of securities available for sale are as follows:

(In thousands)	Amortized cost		Unrealized gains		Unrealized losses			Estimated fair value
June 30, 2016
Federal Agency	$	265,194	$	1,641	$	-		$	266,835
State & municipal		37,105		537		(12	)		37,630
Mortgage-backed:
Government-sponsored enterprises		379,583		9,683		(1	)		389,265
U.S. government agency securities		6,886		547		(13	)		7,420
Collateralized mortgage obligations:
Government-sponsored enterprises		492,466		6,942		(5	)		499,403
U.S. government agency securities		51,571		668		(4	)		52,235
Other securities		16,673		3,744		(1,609	)		18,808
Total securities available for sale	$	1,249,478	$	23,762	$	(1,644	)	$	1,271,596
December 31, 2015
Federal Agency	$	312,580	$	203	$	(1,511	)	$	311,272
State & municipal		31,208		446		(17	)		31,637
Mortgage-backed:
Government-sponsored enterprises		398,086		4,141		(1,068	)		401,159
U.S. government agency securities		8,191		560		(14	)		8,737
Collateralized mortgage obligations:
Government-sponsored enterprises		364,936		931		(1,828	)		364,039
U.S. government agency securities		40,699		348		(115	)		40,932
Other securities		13,637		3,249		(118	)		16,768
Total securities available for sale	$	1,169,337	$	9,878	$	(4,671	)	$	1,174,544

Other securities primarily represent marketable equity securities.

The amortized cost, estimated fair value, and unrealized gains and losses of securities held to maturity are as follows:

(In thousands)	Amortized cost		Unrealized gains		Unrealized losses			Estimated fair value
June 30, 2016
Mortgage-backed:
Government-sponsored enterprises	$	51,206	$	505	$	-		$	51,711
U.S. government agency securities		566		105		-			671
Collateralized mortgage obligations:
Government-sponsored enterprises		251,069		6,259		(256	)		257,072
State & municipal		197,999		4,908		(12	)		202,895
Total securities held to maturity	$	500,840	$	11,777	$	(268	)	$	512,349
December 31, 2015
Mortgage-backed:
Government-sponsored enterprises	$	9,432	$	-	$	(107	)	$	9,325
U.S. government agency securities		611		95		-			706
Collateralized mortgage obligations:
Government-sponsored enterprises		272,550		1,411		(1,560	)		272,401
State & municipal		188,438		2,288		(18	)		190,708
Total securities held to maturity	$	471,031	$	3,794	$	(1,685	)	$	473,140

Securities with amortized costs totaling $1.6 billion at June 30, 2016 and $1.4 billion at December 31, 2015 were pledged to secure public deposits and for other purposes required or permitted by law. At June 30, 2016 and December 31, 2015, securities with an amortized cost of $193.9 million and $205.9 million, respectively, were pledged as collateral for securities sold under repurchase agreements.

The following table sets forth information with regard to investment securities with unrealized losses for the periods presented:

	Less than 12 months							12 months or longer							Total
Security Type:	Fair Value		Unrealized losses			Number of Positions		Fair Value		Unrealized losses			Number of Positions		Fair Value		Unrealized losses			Number of Positions

June 30, 2016
Investment securities available for sale:
State & municipal	$	2,664	$	(10	)		6	$	493	$	(2	)		1	$	3,157	$	(12	)		7
Mortgage-backed		145		(1	)		2		1,010		(13	)		5		1,155		(14	)		7
Collateralized mortgage obligations		11,020		(9	)		2		-		-			-		11,020		(9	)		2
Other securities		-		-			-		4,506		(1,609	)		3		4,506		(1,609	)		3
Total securities with unrealized losses	$	13,829	$	(20	)		10	$	6,009	$	(1,624	)		9	$	19,838	$	(1,644	)		19


Investment securities held to maturity:
Collateralized mortgage obligations	$	-	$	-			-	$	39,767	$	(256	)		4	$	39,767	$	(256	)		4
State & municipal		918		(12	)		2		-		-			-		918		(12	)		2
Total securities with unrealized losses	$	918	$	(12	)		2	$	39,767	$	(256	)		4	$	40,685	$	(268	)		6

December 31, 2015
Investment securities available for sale:
Federal agency	$	186,685	$	(1,312	)		15	$	19,801	$	(199	)		2	$	206,486	$	(1,511	)		17
State & municipal		4,599		(14	)		7		502		(3	)		1		5,101		(17	)		8
Mortgage-backed		177,270		(1,068	)		33		1,066		(14	)		5		178,336		(1,082	)		38
Collateralized mortgage obligations		256,265		(1,889	)		24		5,218		(54	)		2		261,483		(1,943	)		26
Other securities		-		-			-		3,235		(118	)		2		3,235		(118	)		2
Total securities with unrealized losses	$	624,819	$	(4,283	)		79	$	29,822	$	(388	)		12	$	654,641	$	(4,671	)		91


Investment securities held to maturity:
Mortgage-backed	$	9,325	$	(107	)		1	$	-	$	-			-	$	9,325	$	(107	)		1
Collateralized mortgage obligations		105,604		(281	)		12		41,523		(1,279	)		4		147,127		(1,560	)		16
State & municipal		2,200		(18	)		3		-		-			-		2,200		(18	)		3
Total securities with unrealized losses	$	117,129	$	(406	)		16	$	41,523	$	(1,279	)		4	$	158,652	$	(1,685	)		20

Declines in the fair value of held to maturity and available for sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses or in other comprehensive income, depending on whether the Company intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the other-than-temporary impairment shall be recognized in earnings equal to the entire difference between the investment's amortized cost basis and its fair value at the balance sheet date. If the Company does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the other-than-temporary impairment shall be separated into (a) the amount representing the credit loss and (b) the amount related to all other factors. The amount of the total other-than-temporary impairment related to the credit loss shall be recognized in earnings. The amount of the total other-than-temporary impairment related to other factors shall be recognized in other comprehensive income, net of applicable taxes.

In estimating other-than-temporary impairment losses, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) the historical and implied volatility of the fair value of the security.

Management has the intent to hold the securities classified as held to maturity until they mature, at which time it is believed the Company will receive full value for the securities. Furthermore, as of June 30, 2016, management also has the intent to hold, and will not be required to sell, the securities classified as available for sale for a period of time sufficient for a recovery of cost, which may be until maturity. The unrealized losses are due to increases in market interest rates over the yields available at the time the underlying securities were purchased. When necessary, the Company has performed a discounted cash flow analysis to determine whether or not it will receive the contractual principal and interest on certain securities. The fair value is expected to recover as the bonds approach their maturity date or repricing date or if market yields for such investments decline. As of June 30, 2016, management believes the impairments detailed in the table above are temporary and no other-than-temporary impairment losses have been realized in the Company’s consolidated statements of income.

The following tables set forth information with regard to contractual maturities of debt securities at June 30, 2016:

(In thousands)	Amortized cost		Estimated fair value
Debt securities classified as available for sale
Within one year	$	28,638	$	28,768
From one to five years		278,354		281,204
From five to ten years		154,190		157,898
After ten years		771,623		784,918
	$	1,232,805	$	1,252,788
Debt securities classified as held to maturity
Within one year	$	39,152	$	39,185
From one to five years		23,575		23,863
From five to ten years		118,985		122,641
After ten years		319,128		326,660
	$	500,840	$	512,349

Maturities of mortgage-backed and collateralized mortgage obligations 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, there were no holdings, when taken in the aggregate, of any single issuer that exceeded 10% of consolidated stockholders’ equity at June 30, 2016.

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Allowance for Loan Losses and Credit Quality of Loans

6 Months Ended

Jun. 30, 2016

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

Allowance for Loan Losses and Credit Quality of Loans

Note 4.

Allowance for Loan Losses and Credit Quality of Loans

Allowance for Loan Losses

The allowance for loan losses is maintained at a level estimated by management to provide adequately for probable incurred losses inherent in the current loan portfolio. The adequacy of the allowance for loan losses is continuously monitored. It is assessed for adequacy using a methodology designed to ensure the level of the allowance reasonably reflects the loan portfolio’s risk profile. It is evaluated to ensure that it is sufficient to absorb all reasonably estimable credit losses inherent in the current loan portfolio.

To develop and document a systematic methodology for determining the allowance for loan losses, the Company has divided the loan portfolio into three segments, each with different risk characteristics and methodologies for assessing risk. Those segments are further segregated between our loans accounted for under the amortized cost method (referred to as “originated” loans) and loans acquired in a business combination (referred to as “acquired” loans). Each portfolio segment is broken down into class segments where appropriate. Class segments contain unique measurement attributes, risk characteristics and methods for monitoring and assessing risk that are necessary to develop the allowance for loan losses. Unique characteristics such as borrower type, loan type, collateral type, and risk characteristics define each class segment. The following table illustrates the portfolio and class segments for the Company’s loan portfolio:

Portfolio	Class
Commercial Loans	Commercial
	Commercial Real Estate
	Agricultural
	Agricultural Real Estate
	Business Banking
Consumer Loans	Indirect
	Home Equity
	Direct
Residential Real Estate Mortgages

Commercial Loans

The Company offers a variety of commercial loan products including commercial (non-real estate), commercial real estate, agricultural, agricultural real estate, and business banking loans. The Company’s underwriting analysis for commercial loans typically includes credit verification, independent appraisals, a review of the borrower’s financial condition, and a detailed analysis of the borrower’s underlying cash flows.

Commercial – The Company offers a variety of loan options to meet the specific needs of our commercial customers including term loans, time notes and lines of credit. Such loans are made available to businesses for working capital needs such as inventory and receivables, business expansion and equipment purchases. Generally, a collateral lien is placed on equipment or other assets owned by the borrower. These loans carry a higher risk than commercial real estate loans due to the nature of the underlying collateral, which can be business assets such as equipment and accounts receivable. To reduce the risk, management also attempts to secure real estate as collateral and obtain personal guarantees of the borrowers.

Commercial Real Estate – The Company offers commercial real estate loans to finance real estate purchases, refinancings, expansions and improvements to commercial properties. Commercial real estate loans are made to finance the purchases of real estate, generally with completed structures. These commercial real estate loans are secured by first liens on the real estate, which may include apartments, commercial structures, housing businesses, healthcare facilities, and other non owner-occupied facilities. These loans are typically less risky than commercial loans, since they are secured by real estate and buildings, and are generally originated in amounts of no more than 80% of the appraised value of the property.

Agricultural – The Company offers a variety of agricultural loans to meet the needs of our agricultural customers including term loans, time notes, and lines of credit. These loans are made to purchase livestock, purchase and modernize equipment, and finance seasonal crop expenses. Generally, a collateral lien is placed on the livestock, equipment, produce inventories, and/or receivables owned by the borrower. These loans may carry a higher risk than commercial and agricultural real estate loans due to the industry price volatility, and in some cases, the perishable nature of the underlying collateral. To reduce these risks, management may attempt to secure these loans with additional real estate collateral, obtain personal guarantees of the borrowers, or obtain government loan guarantees to provide further support.

Agricultural Real Estate – The Company offers real estate loans to our agricultural customers to finance farm related real estate purchases, refinancings, expansions, and improvements to agricultural properties such as barns, production facilities, and land. The agricultural real estate loans are secured by first liens on the farm real estate. Because they are secured by land and buildings, these loans may be less risky than agricultural loans. These loans are typically originated in amounts of no more than 75% of the appraised value of the property. Government loan guarantees may be obtained to provide further support.

Business Banking – The Company offers a variety of loan options to meet the specific needs of our business banking customers including term loans, business banking mortgages and lines of credit. Such loans are generally less than $0.5 million and are made available to businesses for working capital such as inventory and receivables, business expansion, equipment purchases, and agricultural needs. Generally, a collateral lien is placed on equipment or other assets owned by the borrower such as inventory and/or receivables. These loans carry a higher risk than commercial loans due to the smaller size of the borrower and lower levels of capital. To reduce these risks, the Company obtains personal guarantees of the owners for a majority of the loans.

Consumer Loans

The Company offers a variety of consumer loan products including indirect, home equity, and direct loans.

Indirect – The Company maintains relationships with many dealers primarily in the communities that we serve. Through these relationships, the Company primarily finances the purchases of automobiles and recreational vehicles (such as campers, boats, etc.) indirectly through dealer relationships. Approximately 75% of the indirect relationships represent automobile financing. Most of these loans carry a fixed rate of interest with principal repayment terms typically ranging from three to six years, based upon the nature of the collateral and the size of the loan. The majority of indirect consumer loans are underwritten on a secured basis using the underlying collateral being financed.

Home Equity – The Company offers fixed home equity loans as well as home equity lines of credit to consumers to finance home improvements, debt consolidation, education and other uses. Consumers are able to borrow up to 85% of the equity in their homes. The Company originates home equity lines of credit and second mortgage loans (loans secured by a second junior lien position on one-to-four-family residential real estate). These loans carry a higher risk than first mortgage residential loans as they are in a second position with respect to collateral. Risk is reduced through underwriting criteria, which include credit verification, appraisals, a review of the borrower's financial condition, and personal cash flows. A security interest, with title insurance when necessary, is taken in the underlying real estate.

Direct – The Company offers a variety of consumer installment loans to finance vehicle purchases, mobile home purchases and personal expenditures. Most of these loans carry a fixed rate of interest with principal repayment terms typically ranging from one to ten years, based upon the nature of the collateral and the size of the loan. The majority of consumer loans are underwritten on a secured basis using the underlying collateral being financed or a customer's deposit account. In addition to installment loans, the Company also offers personal lines of credit and overdraft protection. A minimal amount of loans are unsecured, which carry a higher risk of loss.

Residential Real Estate Mortgages

Residential real estate loans consist primarily of loans secured by first or second deeds of trust on primary residences. We originate adjustable-rate and fixed-rate, one-to-four-family residential real estate loans for the construction, purchase or refinancing of a mortgage. These loans are collateralized by owner-occupied properties located in the Company’s market area. Loans on one-to-four-family residential real estate are generally originated in amounts of no more than 85% of the purchase price or appraised value (whichever is lower), or have private mortgage insurance. The Company’s underwriting analysis for residential mortgage loans typically includes credit verification, independent appraisals, and a review of the borrower’s financial condition. Mortgage title insurance and hazard insurance are normally required. Construction loans have a unique risk, because they are secured by an incomplete dwelling. This risk is reduced through periodic site inspections, including one at each loan draw period.

For purposes of evaluating the adequacy of the allowance, the Company considers a number of significant factors that affect the collectability of the portfolio. For individually analyzed loans, these include estimates of loss exposure, which reflect the facts and circumstances that affect the likelihood of repayment of such loans as of the evaluation date. For homogeneous pools of loans, estimates of the Company’s exposure to credit loss reflect a current assessment of a number of factors, which could affect collectability. These factors include: past loss experience, loss emergence period, size, trend, composition, and nature of loans; changes in lending policies and procedures, including underwriting standards and collection, charge-offs and recoveries; trends experienced in nonperforming and delinquent loans; current economic conditions in the Company’s market; portfolio concentrations that may affect loss experienced across one or more components of the portfolio; the effect of external factors such as competition, legal and regulatory requirements; and the experience, ability, and depth of lending management and staff. In addition, various regulatory agencies, as an integral component of their examination process, periodically review the Company’s allowance for loan losses. Such agencies may require the Company to make loan grade changes as well as recognize additions to the allowance based on their examinations.

After a thorough consideration of the factors discussed above, any required additions or reductions to the allowance for loan losses are made periodically by charges or credits to the provision for loan losses. These charges or credits are necessary to maintain the allowance at a level which management believes is reasonably reflective of overall inherent risk of probable loss in the portfolio. While management uses available information to recognize losses on loans, additions and reductions of the allowance may fluctuate from one reporting period to another. These fluctuations are reflective of changes in risk associated with portfolio content and/or changes in management’s assessment of any or all of the determining factors discussed above.

The following tables illustrate the changes in the allowance for loan losses by our portfolio segments for the three and six months ended June 30, 2016 and 2015:

Three months ended June 30,	Commercial Loans			Consumer Loans			Residential Real Estate Mortgages			Unallocated			Total
Balance as of March 31, 2016	$	25,299		$	31,035		$	7,984		$	-		$	64,318
Charge-offs		(649	)		(4,950	)		(268	)		-			(5,867	)
Recoveries		339			907			91			-			1,337
Provision		233			4,479			68			-			4,780
Ending Balance as of June 30, 2016	$	25,222		$	31,471		$	7,875		$	-		$	64,568

Balance as of March 31, 2015	$	31,278		$	26,156		$	7,698		$	227		$	65,359
Charge-offs		(584	)		(4,275	)		(509	)		-			(5,368	)
Recoveries		280			697			93			-			1,070
Provision		(2,648	)		5,736			999			(189	)		3,898
Ending Balance as of June 30, 2015	$	28,326		$	28,314		$	8,281		$	38		$	64,959

Six months ended June 30,	Commercial Loans			Consumer Loans			Residential Real Estate Mortgages			Unallocated			Total
Balance as of December 31, 2015	$	25,545		$	29,253		$	7,960		$	260		$	63,018
Charge-offs		(1,086	)		(10,363	)		(977	)		-			(12,426	)
Recoveries		1,104			1,881			113			-			3,098
Provision		(341	)		10,700			779			(260	)		10,878
Ending Balance as of June 30, 2016	$	25,222		$	31,471		$	7,875		$	-		$	64,568

Balance as of December 31, 2014	$	32,433		$	26,720		$	7,130		$	76		$	66,359
Charge-offs		(1,382	)		(8,653	)		(1,013	)		-			(11,048	)
Recoveries		514			1,445			149			-			2,108
Provision		(3,239	)		8,802			2,015			(38	)		7,540
Ending Balance as of June 30, 2015	$	28,326		$	28,314		$	8,281		$	38		$	64,959

Included in the above table there was $0.8 million and $1.9 million in the allowance for loan losses related to acquired commercial loans as of June 30, 2016 and June 30, 2015, respectively. Net charge-offs related to acquired loans totaled approximately $0.1 million and $0.1 million during the three months ended June 30, 2016 and 2015, respectively, and approximately $0.4 million and $0.7 million during the six months ended June 30, 2016 and 2015, respectively, and are included in the table above.

The following tables illustrate the allowance for loan losses and the recorded investment by portfolio segments as of June 30, 2016 and December 31, 2015:

Allowance for Loan Losses and Recorded Investment in Loans

(in thousands)

	Commercial Loans		Consumer Loans		Residential Real Estate Mortgages		Unallocated		Total
As of June 30, 2016
Allowance for loan losses	$	25,222	$	31,471	$	7,875	$	-	$	64,568

Allowance for loans individually evaluated for impairment		3,215		-		-		-		3,215

Allowance for loans collectively evaluated for impairment	$	22,007	$	31,471	$	7,875	$	-	$	61,353

Ending balance of loans	$	2,673,691	$	2,146,314	$	1,219,388			$	6,039,393

Ending balance of originated loans individually evaluated for impairment		20,034		8,190		6,174				34,398
Ending balance of acquired loans individually evaluated for impairment		1,205		-		-				1,205
Ending balance of acquired loans collectively evaluated for impairment		268,814		77,387		214,668				560,869
Ending balance of originated loans collectively evaluated for impairment	$	2,383,638	$	2,060,737	$	998,546			$	5,442,921

As of December 31, 2015
Allowance for loan losses	$	25,545	$	29,253	$	7,960	$	260	$	63,018

Allowance for loans individually evaluated for impairment		2,005		-		-		-		2,005

Allowance for loans collectively evaluated for impairment	$	23,540	$	29,253	$	7,960	$	260	$	61,013

Ending balance of loans	$	2,589,707	$	2,096,646	$	1,196,780			$	5,883,133

Ending balance of originated loans individually evaluated for impairment		12,253		7,693		6,017				25,963
Ending balance of acquired loans individually evaluated for impairment		1,205		-		-				1,205
Ending balance of acquired loans collectively evaluated for impairment		284,524		95,427		230,358				610,309
Ending balance of originated loans collectively evaluated for impairment	$	2,291,725	$	1,993,526	$	960,405			$	5,245,656

Credit Quality of Loans

Loans are placed on nonaccrual status when timely collection of principal and interest in accordance with contractual terms is doubtful. Loans are transferred to nonaccrual status generally when principal or interest payments become 90 days delinquent, unless the loan is well secured and in the process of collection, or sooner when management concludes or circumstances indicate that borrowers may be unable to meet contractual principal or interest payments. When a loan is transferred to a nonaccrual status, all interest previously accrued in the current period but not collected is reversed against interest income in that period. Interest accrued in a prior period and not collected is charged-off against the allowance for loan losses. The Company’s nonaccrual policies are the same for all classes of financing receivable.

If ultimate repayment of a nonaccrual loan is expected, any payments received are applied in accordance with contractual terms. If ultimate repayment of principal is not expected, any payment received on a nonaccrual loan is applied to principal until ultimate repayment becomes expected. Nonaccrual loans are returned to accrual status when they become current as to principal and interest and demonstrate a period of performance under the contractual terms and, in the opinion of management, are fully collectible as to principal and interest. When in the opinion of management the collection of principal appears unlikely, the loan balance is charged-off in total or in part. For loans in all portfolios, the principal amount is charged off in full or in part as soon as management determines, based on available facts, that the collection of principal in full is improbable. For commercial loans, management considers specific facts and circumstances relative to individual credits in making such a determination. For consumer and residential loan classes, management uses specific guidance and thresholds from the Federal Financial Institutions Examination Council’s Uniform Retail Credit Classification and Account Management Policy.

The following tables set forth information with regard to past due and nonperforming loans by loan class as of June 30, 2016 and December 31, 2015:

Age Analysis of Past Due Financing Receivables

As of June 30, 2016

(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
ORIGINATED
Commercial Loans
Commercial	$	663	$	85	$	-	$	748	$	3,362	$	656,219	$	660,329
Commercial Real Estate		1,576		-		-		1,576		13,078		1,254,984		1,269,638
Agricultural		86		-		-		86		669		35,007		35,762
Agricultural Real Estate		-		-		-		-		470		29,909		30,379
Business Banking		2,234		461		-		2,695		3,723		401,146		407,564
		4,559		546		-		5,105		21,302		2,377,265		2,403,672

Consumer Loans
Indirect		14,096		3,542		1,398		19,036		1,499		1,528,126		1,548,661
Home Equity		3,499		740		154		4,393		3,241		451,357		458,991
Direct		450		88		20		558		46		60,671		61,275
		18,045		4,370		1,572		23,987		4,786		2,040,154		2,068,927
Residential Real Estate Mortgages		2,695		1,516		27		4,238		6,451		994,031		1,004,720
	$	25,299	$	6,432	$	1,599	$	33,330	$	32,539	$	5,411,450	$	5,477,319

ACQUIRED
Commercial Loans
Commercial	$	-	$	72	$	-	$	72	$	-	$	62,882	$	62,954
Commercial Real Estate		443		-		-		443		1,313		160,176		161,932
Business Banking		420		389		-		809		406		43,918		45,133
		863		461		-		1,324		1,719		266,976		270,019

Consumer Loans
Indirect		105		8		13		126		68		16,407		16,601
Home Equity		368		-		-		368		440		56,679		57,487
Direct		25		21		1		47		23		3,229		3,299
		498		29		14		541		531		76,315		77,387
Residential Real Estate Mortgages		673		642		-		1,315		2,608		210,745		214,668
	$	2,034	$	1,132	$	14	$	3,180	$	4,858	$	554,036	$	562,074
Total Loans	$	27,333	$	7,564	$	1,613	$	36,510	$	37,397	$	5,965,486	$	6,039,393

Age Analysis of Past Due Financing Receivables

As of December 31, 2015

(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
ORIGINATED
Commercial Loans
Commercial	$	782	$	23	$	-	$	805	$	2,817	$	640,696	$	644,318
Commercial Real Estate		39		32		-		71		5,546		1,189,280		1,194,897
Agricultural		94		-		-		94		897		33,633		34,624
Agricultural Real Estate		-		-		-		-		1,046		28,172		29,218
Business Banking		912		394		-		1,306		4,247		395,368		400,921
		1,827		449		-		2,276		14,553		2,287,149		2,303,978

Consumer Loans
Indirect		15,731		2,963		2,271		20,965		1,786		1,454,499		1,477,250
Home Equity		3,396		1,671		340		5,407		4,835		454,473		464,715
Direct		425		201		28		654		49		58,551		59,254
		19,552		4,835		2,639		27,026		6,670		1,967,523		2,001,219
Residential Real Estate Mortgages		3,301		365		696		4,362		7,713		954,347		966,422
	$	24,680	$	5,649	$	3,335	$	33,664	$	28,936	$	5,209,019	$	5,271,619


ACQUIRED
Commercial Loans
Commercial	$	-	$	-	$	-	$	-	$	-	$	68,991	$	68,991
Commercial Real Estate		-		-		-		-		1,313		165,630		166,943
Business Banking		288		-		-		288		307		49,200		49,795
		288		-		-		288		1,620		283,821		285,729

Consumer Loans
Indirect		143		11		1		155		104		27,516		27,775
Home Equity		327		132		-		459		457		62,811		63,727
Direct		76		20		-		96		43		3,786		3,925
		546		163		1		710		604		94,113		95,427
Residential Real Estate Mortgages		1,443		293		326		2,062		2,584		225,712		230,358
	$	2,277	$	456	$	327	$	3,060	$	4,808	$	603,646	$	611,514
Total Loans	$	26,957	$	6,105	$	3,662	$	36,724	$	33,744	$	5,812,665	$	5,883,133

There were no material commitments to extend further credit to borrowers with nonperforming loans.

Impaired Loans

The methodology used to establish the allowance for loan losses on impaired loans incorporates specific allocations on loans analyzed individually. Classified and nonperforming loans with outstanding balances of $0.5 million or more and all troubled debt restructured loans (“TDRs”) are evaluated for impairment through the Company’s quarterly status review process. In determining that we will be unable to collect all principal and interest payments due in accordance with the contractual terms of the loan agreements, we consider factors such as payment history and changes in the financial condition of individual borrowers, local economic conditions, historical loss experience and the conditions of the various markets in which the collateral may be liquidated. For loans that are impaired as defined by accounting standards, impairment is measured by one of three methods: 1) the fair value of collateral less cost to sell, 2) present value of expected future cash flows discounted at the loan's original effective interest rate or 3) the loan’s observable market price. All impaired loans are reviewed on a quarterly basis for changes in the level of impairment. Any change to the previously recognized impairment loss is recognized as a change to the allowance account and recorded in the unaudited interim consolidated statements of income as a component of the provision for loan losses.

The following table provides information on loans specifically evaluated for impairment as of June 30, 2016 and December 31, 2015:

	June 30, 2016							December 31, 2015
(in thousands)	Recorded Investment Balance(Book)		UnpaidPrincipalBalance(Legal)		RelatedAllowance			RecordedInvestmentBalance(Book)		UnpaidPrincipalBalance(Legal)		RelatedAllowance
ORIGINATED
With no related allowance recorded:
Commercial Loans
Commercial	$	2,194	$	2,444				$	2,244	$	2,490
Commercial Real Estate		7,836		7,905					3,165		3,175
Agricultural		18		24					576		1,164
Agricultural Real Estate		608		733					618		744
Business Banking		965		1,027					983		1,033
Total Commercial Loans		11,621		12,133					7,586		8,606

Consumer Loans
Indirect		8		19					12		21
Home Equity		8,182		9,121					7,681		8,574
Direct		-		1					-		-
Total Consumer Loans		8,190		9,141					7,693		8,595

Residential Real Estate Mortgages		6,174		6,893					6,017		6,627
Total		25,985		28,167					21,296		23,828

With an allowance recorded:
Commercial Loans
Commercial		1,022		1,022		$	495		457		457		$	300
Commercial Real Estate		7,391		9,239			1,890		4,210		6,059			970
Total Commercial Loans		8,413		10,261			2,385		4,667		6,516			1,270

ACQUIRED
With an allowance recorded:
Commercial Loans
Commercial Real Estate		1,205		1,321			830		1,205		1,321			735
Total Commercial Loans		1,205		1,321			830		1,205		1,321			735

Total:	$	35,603	$	39,749		$	3,215	$	27,168	$	31,665		$	2,005

The following tables summarize the average recorded investments on impaired loans specifically evaluated for impairment and the interest income recognized for the three and six months ended June 30, 2016 and 2015:

	For the three months ended
	June 30, 2016				June 30, 2015
(in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
ORIGINATED
Commercial Loans
Commercial	$	3,126	$	-	$	1,768	$	61
Commercial Real Estate		15,278		-		9,060		41
Agricultural		18		-		19		-
Agricultural Real Estate		610		11		630		12
Business Banking		969		6		975		2
Consumer Loans
Indirect		9		-		16		-
Home Equity		8,223		120		6,692		92
Direct		-		-		1		-
Residential Real Estate Mortgage		6,203		67		4,636		33
Total Originated	$	34,436	$	204	$	23,797	$	241

ACQUIRED
Commercial Loans
Commercial		-		-		2,602		-
Commercial Real Estate		1,205		-		7,205		-
Total Acquired	$	1,205	$	-	$	9,807	$	-
Total Loans	$	35,641	$	204	$	33,604	$	241

	For the six months ended
	June 30, 2016				June 30, 2015
(in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
ORIGINATED
Commercial Loans
Commercial	$	2,972	$	-	$	1,742	$	86
Commercial Real Estate		14,264		74		9,091		82
Agricultural		98		1		19		1
Agricultural Real Estate		613		22		633		23
Business Banking		973		12		932		6
Consumer Loans
Indirect		10		-		11		-
Home Equity		8,093		241		6,560		164
Direct		-		-		1		-
Residential Real Estate Mortgage		6,154		134		4,476		63
Total Originated	$	33,177	$	484	$	23,465	$	425

ACQUIRED
Commercial Loans
Commercial		-		-		2,722		-
Commercial Real Estate		1,205		-		7,176		-
Total Acquired	$	1,205	$	-	$	9,898	$	-
Total Loans	$	34,382	$	484	$	33,363	$	425

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, enabling recognition and response to problem loans and potential problem loans.

Commercial Grading System

For commercial and agricultural loans, the Company uses a grading system that relies on quantifiable and measurable characteristics when available. This would include 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. Classified commercial loans consist of loans graded substandard and below. The grading system for commercial and agricultural loans is as follows:

●

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 (declining revenues or margins) or may be struggling with an ill-proportioned balance sheet (e.g., increasing inventory without an increase in sales, high leverage, 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.

Business Banking Grading System

Business banking loans are graded as either Classified or Non-classified:

●

Classified

Classified loans are inadequately protected by the current worth and paying capacity of the obligor or, if applicable, the collateral pledged. These loans have a well-defined weakness, or weaknesses, that jeopardize the liquidation of the debt, or in some cases make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Classified loans have a high probability of payment default, or a high probability of total or substantial loss. These loans require more intensive supervision by management and 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. When the likelihood of full collection of interest and principal may be in doubt; classified loans are considered to have a nonaccrual status. In some cases, Classified loans are considered uncollectible and of such little value that their continuance as assets is not warranted.

●

Non-classified

Loans graded as Non-classified encompass all loans not graded as Classified. Non-classified loans are in compliance with loan covenants, and payments are generally made as agreed and it is expected that such timely payments of principal and interest will continue.

Consumer and Residential Mortgage Grading System

Consumer and Residential Mortgage loans are graded as either Performing or Nonperforming. Nonperforming loans are loans that are 1) over 90 days past due and interest is still accruing, 2) on nonaccrual status or 3) restructured. All loans not meeting any of these three criteria are considered Performing.

The following tables illustrate the Company’s credit quality by loan class as of June 30, 2016 and December 31, 2015:

Credit Quality Indicators

As of June 30, 2016

ORIGINATED
Commercial Credit Exposure By Internally Assigned Grade:	Commercial		Commercial Real Estate		Agricultural		Agricultural Real Estate		Total
Pass	$	610,816	$	1,219,723	$	35,365	$	29,448	$	1,895,352
Special Mention		17,774		13,035		1		5		30,815
Substandard		31,739		36,880		388		926		69,933
Doubtful		-		-		8		-		8
Total	$	660,329	$	1,269,638	$	35,762	$	30,379	$	1,996,108

Business Banking Credit Exposure By Internally Assigned Grade:	Business Banking								Total
Non-classified	$	393,805							$	393,805
Classified		13,759								13,759
Total	$	407,564							$	407,564

Consumer Credit Exposure By Payment Activity:	Indirect		Home Equity		Direct				Total
Performing	$	1,545,764	$	455,596	$	61,209			$	2,062,569
Nonperforming		2,897		3,395		66				6,358
Total	$	1,548,661	$	458,991	$	61,275			$	2,068,927

Residential Mortgage Credit Exposure By Payment Activity:	Residential Mortgage								Total
Performing	$	998,242							$	998,242
Nonperforming		6,478								6,478
Total	$	1,004,720							$	1,004,720

Credit Quality Indicators

As of June 30, 2016

ACQUIRED
Commercial Credit Exposure By Internally Assigned Grade:	Commercial		Commercial Real Estate				Total
Pass	$	59,681	$	150,076			$	209,757
Special Mention		1,447		1,799				3,246
Substandard		1,826		10,057				11,883
Total	$	62,954	$	161,932			$	224,886

Business Banking Credit Exposure By Internally Assigned Grade:	Business Banking						Total
Non-classified	$	41,739					$	41,739
Classified		3,394						3,394
Total	$	45,133					$	45,133

Consumer Credit Exposure By Payment Activity:	Indirect		Home Equity		Direct		Total
Performing	$	16,520	$	57,047	$	3,275	$	76,842
Nonperforming		81		440		24		545
Total	$	16,601	$	57,487	$	3,299	$	77,387

Residential Mortgage Credit Exposure By Payment Activity:	Residential Mortgage						Total
Performing	$	212,060					$	212,060
Nonperforming		2,608						2,608
Total	$	214,668					$	214,668

Credit Quality Indicators

As of December 31, 2015

ORIGINATED
Commercial Credit Exposure By Internally Assigned Grade:	Commercial		Commercial Real Estate		Agricultural		Agricultural Real Estate		Total
Pass	$	604,405	$	1,144,832	$	33,565	$	27,320	$	1,810,122
Special Mention		9,726		21,587		311		429		32,053
Substandard		30,187		28,478		740		1,469		60,874
Doubtful		-		-		8		-		8
Total	$	644,318	$	1,194,897	$	34,624	$	29,218	$	1,903,057

Business Banking Credit Exposure By Internally Assigned Grade:	Business Banking								Total
Non-classified	$	386,397							$	386,397
Classified		14,524								14,524
Total	$	400,921							$	400,921
Total
Consumer Credit Exposure By Payment Activity:	Indirect		Home Equity		Direct				Total
Performing	$	1,473,193	$	459,540	$	59,177			$	1,991,910
Nonperforming		4,057		5,175		77				9,309
Total	$	1,477,250	$	464,715	$	59,254			$	2,001,219

Residential Mortgage Credit Exposure By Payment Activity:	Residential Mortgage								Total
Performing	$	958,013							$	958,013
Nonperforming		8,409								8,409
Total	$	966,422							$	966,422

Credit Quality Indicators

As of December 31, 2015

ACQUIRED
Commercial Credit Exposure By Internally Assigned Grade:	Commercial		Commercial Real Estate				Total
Pass	$	67,241	$	154,871			$	222,112
Special Mention		802		2,174				2,976
Substandard		948		9,898				10,846
Total	$	68,991	$	166,943			$	235,934

Business Banking Credit Exposure By Internally Assigned Grade:	Business Banking						Total
Non-classified	$	46,032					$	46,032
Classified		3,763						3,763
Total	$	49,795					$	49,795

Consumer Credit Exposure By Payment Activity:	Indirect		Home Equity		Direct		Total
Performing	$	27,670	$	63,270	$	3,882	$	94,822
Nonperforming		105		457		43		605
Total	$	27,775	$	63,727	$	3,925	$	95,427

Residential Mortgage Credit Exposure By Payment Activity:	Residential Mortgage						Total
Performing	$	227,448					$	227,448
Nonperforming		2,910						2,910
Total	$	230,358					$	230,358

Troubled Debt Restructured Loans

The Company’s loan portfolio includes certain loans that have been modified where economic concessions have been granted to borrowers who have experienced or are expected to experience financial difficulties. These concessions typically result from the Company’s loss mitigation activities and could include reductions in the interest rate, payment extensions, forgiveness of principal, forbearance or other actions. Certain TDRs are classified as nonperforming at the time of restructure and may only be returned to performing status after considering the borrower’s sustained repayment performance for a reasonable period, generally six months. Substantially all of these modifications included 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; temporary reduction in the interest rate; or change in scheduled payment amount.

When the Company modifies a loan, management evaluates any possible impairment based on the present value of the expected future cash flows, discounted at the contractual interest rate of the original loan agreement, except when the sole (remaining) source of repayment for the loan is the operation or liquidation of the collateral. In these cases, management uses the current fair value of the collateral, less selling costs, instead of discounted cash flows. If management determines that the value of the modified loan is less than the recorded investment in the loan (net of previous charge-offs, deferred loan fees or costs and unamortized premium or discount), impairment is recognized through an allowance estimate or a charge-off to the allowance.

The following tables illustrate the recorded investment and number of modifications for modified loans, including the recorded investment in the loans prior to a modification and the recorded investment in the loans after restructuring for the three and six months ended June 30, 2016 and 2015:

	Three months ended June 30, 2016
	Number of contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
Consumer
Home Equity		2	$	74	$	73
Total Consumer		2		74		73

Residential Real Estate		2		152		151

Total Troubled Debt Restructurings		4	$	226	$	224

	Three months ended June 30, 2015
	Number of contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
Commercial
Commercial		1	$	1,165	$	1,165
Business Banking		1		190		176
Total Commercial		2		1,355		1,341

Consumer
Home Equity		12		1,071		1,128
Total Consumer		12		1,071		1,128

Residential Real Estate		6		370		770

Total Troubled Debt Restructurings		20	$	2,796	$	3,239

	Six months ended June 30, 2016
	Number of contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
Consumer
Home Equity		14	$	1,109	$	1,017
Total Consumer		14		1,109		1,017

Residential Real Estate		6		683		578

Total Troubled Debt Restructurings		20	$	1,792	$	1,595

	Six months ended June 30, 2015
	Number of contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
Commercial
Commercial		1	$	1,165	$	1,165
Business Banking		1		190		176
Total Commercial		2		1,355		1,341

Consumer
Home Equity		31		2,218		2,236
Total Consumer		31		2,218		2,236

Residential Real Estate		15		1,072		1,522

Total Troubled Debt Restructurings		48	$	4,645	$	5,099

There were no defaults on TDRs for the three months ended June 30, 2016 and 2015. The following table illustrates the recorded investment and number of modifications for TDRs within the six months ended June 30, 2016 and 2015 where a concession has been made and subsequently defaulted during the period:

	Six months ended June 30, 2016				Six months ended June 30, 2015
	Number of contracts		Recorded Investment		Number of contracts		Recorded Investment
Consumer
Home Equity		-	$	-		4	$	233

Residential Real Estate		1		175		-		-

Total Troubled Debt Restructurings		1	$	175		4	$	233

Fair Value Measurements and Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2016

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

Fair Value Measurements and Fair Value of Financial Instruments

Note 8.

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;

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 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.

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.

For the six month period ending June 30, 2016, the Company has made no transfers of assets between Level 1 and Level 2, and has had no Level 3 activity.

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):

June 30, 2016:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of June 30, 2016
Assets:
Securities Available for Sale:
Federal Agency	$	-	$	266,835	$	-	$	266,835
State & municipal		-		37,630		-		37,630
Mortgage-backed		-		396,685		-		396,685
Collateralized mortgage obligations		-		551,638		-		551,638
Other securities		9,458		9,350		-		18,808
Total Securities Available for Sale	$	9,458	$	1,262,138	$	-	$	1,271,596
Trading Securities		8,591		-		-		8,591
Interest Rate Swaps		-		17,775		-		17,775
Total	$	18,049	$	1,279,913	$	-	$	1,297,962

Liabilities:
Interest Rate Swaps	$	-	$	17,838	$	-	$	17,838
Total	$	-	$	17,838	$	-	$	17,838

December 31, 2015:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of December 31, 2015
Assets:
Securities Available for Sale:
Federal Agency	$	-	$	311,272	$	-	$	311,272
State & municipal		-		31,637		-		31,637
Mortgage-backed		-		409,896		-		409,896
Collateralized mortgage obligations		-		404,971		-		404,971
Other securities		7,526		9,242		-		16,768
Total Securities Available for Sale	$	7,526	$	1,167,018	$	-	$	1,174,544
Trading Securities		8,377		-		-		8,377
Interest Rate Swaps		-		6,224		-		6,224
Total	$	15,903	$	1,173,242	$	-	$	1,189,145

Liabilities:
Interest Rate Swaps	$	-	$	6,224	$	-	$	6,224
Total	$	-	$	6,224	$	-	$	6,224

Certain common equity securities are reported at fair value utilizing Level 1 inputs (exchange quoted prices). The majority of the other investment securities are reported at fair value utilizing Level 2 inputs. The prices for these 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 in pricing the securities by its third party providers.

GAAP requires disclosure of assets and liabilities measured and recorded at fair value on a nonrecurring basis such as goodwill, loans held for sale, other real estate owned, collateral-dependent impaired loans, mortgage servicing rights, and held to maturity securities. The only nonrecurring fair value measurements recorded during the six month period ended June 30, 2016 were related to impaired loans. For the six month periods ending June 30, 2016 and June 30, 2015, the Company had $9.6 million and $8.7 million, respectively, of loans recorded at fair value resulting in specific allowance reserves of $3.2 million and $2.9 million, respectively. The Company uses the fair value of underlying collateral, less costs to sell, to estimate the specific reserves for collateral dependent impaired loans. The appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses ranging from 10% to 35%. Based on the valuation techniques used, the fair value measurements for collateral dependent impaired loans are classified as Level 3.

The following table sets forth information with regard to estimated fair values of financial instruments at June 30, 2016 and December 31, 2015. 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, securities available for sale, trading securities, accrued interest receivable, non-maturity deposits, short-term borrowings, accrued interest payable, and interest rate swaps.

			June 30, 2016				December 31, 2015
(In thousands)	Fair Value Hierarchy		Carrying amount		Estimated fair value		Carrying amount		Estimated fair value
Financial assets
Securities held to maturity		2	$	500,840	$	512,349	$	471,031	$	473,140
Net loans		3		5,974,825		6,136,103		5,820,115		5,958,427
Financial liabilities
Time deposits		2	$	882,712	$	886,047	$	908,827	$	903,501
Long-term debt		2		110,306		111,968		130,447		131,268
Junior subordinated debt		2		101,196		96,583		101,196		97,346

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 trust and investment management operation that contributes net fee income annually. The trust and investment 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.

Securities Held to Maturity

The fair value of the Company’s investment securities held to maturity 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

The fair value of the Company’s loans was estimated by discounting the expected future cash flows using the current interest rates at which similar loans would be made for the same remaining maturities. 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.

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.

Junior Subordinated Debt

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

Interest Rate Swaps

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 in 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 in hedging relationships. Interest rate swaps are recorded within other assets or other liabilities on the consolidated balance sheet 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 statement of income. The notional amount of these customer derivative agreement and the offsetting derivative counterparty positions each totaled $288.1 million at June 30, 2016. Fair values included in other assets and other liabilities on the consolidated balance sheet applicable to these agreements amounted to $17.8 million. At December 31, 2015, the notional amount of these customer derivate agreements and the offsetting derivative counterparty positions each totaled $192.6 million. At December 31, 2015, fair values included in other assets and other liabilities on the consolidated balance sheet applicable to these agreements amounted to $6.2 million.

In June 2016, the Company entered into interest rate swaps to modify the interest rate characteristics of certain short-term FHLB advances from variable rate to fixed rate in order to reduce the impact of changes in future cash flows due to market interest rate changes. These agreements are designated as cash flow hedges. The notional amount of these interest rate derivative agreements total $150 million at June 30, 2016. Fair values included in other liabilities on the consolidated balance sheet applicable to these agreements amounted to $0.1 million at June 30, 2016.

- 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 + Details

Allowance for Loan Losses and Credit Quality of Loans (Policies)

6 Months Ended

Jun. 30, 2016

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

Portfolio and Class Segments

The following table illustrates the portfolio and class segments for the Company’s loan portfolio:

Portfolio	Class
Commercial Loans	Commercial
	Commercial Real Estate
	Agricultural
	Agricultural Real Estate
	Business Banking
Consumer Loans	Indirect
	Home Equity
	Direct
Residential Real Estate Mortgages

Allowance for Loan Losses

Portfolio	Class
Commercial Loans	Commercial
	Commercial Real Estate
	Agricultural
	Agricultural Real Estate
	Business Banking
Consumer Loans	Indirect
	Home Equity
	Direct
Residential Real Estate Mortgages

Commercial Loans

Consumer Loans

The Company offers a variety of consumer loan products including indirect, home equity, and direct loans.

Residential Real Estate Mortgages

Troubled Debt Restructuring

Troubled Debt Restructured Loans

Fair Value Measurements and Fair Value of Financial Instruments (Policies)	6 Months Ended
	Jun. 30, 2016
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; 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 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. 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. For the six month period ending June 30, 2016, the Company has made no transfers of assets between Level 1 and Level 2, and has had no Level 3 activity. Certain common equity securities are reported at fair value utilizing Level 1 inputs (exchange quoted prices). The majority of the other investment securities are reported at fair value utilizing Level 2 inputs. The prices for these 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 in pricing the securities by its third party providers. GAAP requires disclosure of assets and liabilities measured and recorded at fair value on a nonrecurring basis such as goodwill, loans held for sale, other real estate owned, collateral-dependent impaired loans, mortgage servicing rights, and held to maturity securities. The only nonrecurring fair value measurements recorded during the six month period ended June 30, 2016 were related to impaired loans. For the six month periods ending June 30, 2016 and June 30, 2015, the Company had $9.6 million and $8.7 million, respectively, of loans recorded at fair value resulting in specific allowance reserves of $3.2 million and $2.9 million, respectively. The Company uses the fair value of underlying collateral, less costs to sell, to estimate the specific reserves for collateral dependent impaired loans. The appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses ranging from 10% to 35%. Based on the valuation techniques used, the fair value measurements for collateral dependent impaired 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 trust and investment management operation that contributes net fee income annually. The trust and investment 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. Securities Held to Maturity The fair value of the Company’s investment securities held to maturity 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 The fair value of the Company’s loans was estimated by discounting the expected future cash flows using the current interest rates at which similar loans would be made for the same remaining maturities. 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. 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. Junior Subordinated Debt The fair value of junior subordinated debt has been estimated using a discounted cash flow analysis. Interest Rate Swaps 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 in 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 in hedging relationships. Interest rate swaps are recorded within other assets or other liabilities on the consolidated balance sheet 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 statement of income. The notional amount of these customer derivative agreement and the offsetting derivative counterparty positions each totaled $288.1 million at June 30, 2016. Fair values included in other assets and other liabilities on the consolidated balance sheet applicable to these agreements amounted to $17.8 million. At December 31, 2015, the notional amount of these customer derivate agreements and the offsetting derivative counterparty positions each totaled $192.6 million. At December 31, 2015, fair values included in other assets and other liabilities on the consolidated balance sheet applicable to these agreements amounted to $6.2 million. In June 2016, the Company entered into interest rate swaps to modify the interest rate characteristics of certain short-term FHLB advances from variable rate to fixed rate in order to reduce the impact of changes in future cash flows due to market interest rate changes. These agreements are designated as cash flow hedges. The notional amount of these interest rate derivative agreements total $150 million at June 30, 2016. Fair values included in other liabilities on the consolidated balance sheet applicable to these agreements amounted to $0.1 million at June 30, 2016.

Securities (Tables)

6 Months Ended

Jun. 30, 2016

Securities [Abstract]

Amortized Cost, Estimated Fair Value, and Unrealized Gains and Losses of Securities Available for Sale

The amortized cost, estimated fair value, and unrealized gains and losses of securities available for sale are as follows:

(In thousands)	Amortized cost		Unrealized gains		Unrealized losses			Estimated fair value
June 30, 2016
Federal Agency	$	265,194	$	1,641	$	-		$	266,835
State & municipal		37,105		537		(12	)		37,630
Mortgage-backed:
Government-sponsored enterprises		379,583		9,683		(1	)		389,265
U.S. government agency securities		6,886		547		(13	)		7,420
Collateralized mortgage obligations:
Government-sponsored enterprises		492,466		6,942		(5	)		499,403
U.S. government agency securities		51,571		668		(4	)		52,235
Other securities		16,673		3,744		(1,609	)		18,808
Total securities available for sale	$	1,249,478	$	23,762	$	(1,644	)	$	1,271,596
December 31, 2015
Federal Agency	$	312,580	$	203	$	(1,511	)	$	311,272
State & municipal		31,208		446		(17	)		31,637
Mortgage-backed:
Government-sponsored enterprises		398,086		4,141		(1,068	)		401,159
U.S. government agency securities		8,191		560		(14	)		8,737
Collateralized mortgage obligations:
Government-sponsored enterprises		364,936		931		(1,828	)		364,039
U.S. government agency securities		40,699		348		(115	)		40,932
Other securities		13,637		3,249		(118	)		16,768
Total securities available for sale	$	1,169,337	$	9,878	$	(4,671	)	$	1,174,544

Amortized Cost, Estimated Fair Value, and Unrealized Gains and Losses of Securities Held to Maturity

The amortized cost, estimated fair value, and unrealized gains and losses of securities held to maturity are as follows:

(In thousands)	Amortized cost		Unrealized gains		Unrealized losses			Estimated fair value
June 30, 2016
Mortgage-backed:
Government-sponsored enterprises	$	51,206	$	505	$	-		$	51,711
U.S. government agency securities		566		105		-			671
Collateralized mortgage obligations:
Government-sponsored enterprises		251,069		6,259		(256	)		257,072
State & municipal		197,999		4,908		(12	)		202,895
Total securities held to maturity	$	500,840	$	11,777	$	(268	)	$	512,349
December 31, 2015
Mortgage-backed:
Government-sponsored enterprises	$	9,432	$	-	$	(107	)	$	9,325
U.S. government agency securities		611		95		-			706
Collateralized mortgage obligations:
Government-sponsored enterprises		272,550		1,411		(1,560	)		272,401
State & municipal		188,438		2,288		(18	)		190,708
Total securities held to maturity	$	471,031	$	3,794	$	(1,685	)	$	473,140

Investment Securities with Unrealized Losses

The following table sets forth information with regard to investment securities with unrealized losses for the periods presented:

	Less than 12 months							12 months or longer							Total
Security Type:	Fair Value		Unrealized losses			Number of Positions		Fair Value		Unrealized losses			Number of Positions		Fair Value		Unrealized losses			Number of Positions

June 30, 2016
Investment securities available for sale:
State & municipal	$	2,664	$	(10	)		6	$	493	$	(2	)		1	$	3,157	$	(12	)		7
Mortgage-backed		145		(1	)		2		1,010		(13	)		5		1,155		(14	)		7
Collateralized mortgage obligations		11,020		(9	)		2		-		-			-		11,020		(9	)		2
Other securities		-		-			-		4,506		(1,609	)		3		4,506		(1,609	)		3
Total securities with unrealized losses	$	13,829	$	(20	)		10	$	6,009	$	(1,624	)		9	$	19,838	$	(1,644	)		19


Investment securities held to maturity:
Collateralized mortgage obligations	$	-	$	-			-	$	39,767	$	(256	)		4	$	39,767	$	(256	)		4
State & municipal		918		(12	)		2		-		-			-		918		(12	)		2
Total securities with unrealized losses	$	918	$	(12	)		2	$	39,767	$	(256	)		4	$	40,685	$	(268	)		6

December 31, 2015
Investment securities available for sale:
Federal agency	$	186,685	$	(1,312	)		15	$	19,801	$	(199	)		2	$	206,486	$	(1,511	)		17
State & municipal		4,599		(14	)		7		502		(3	)		1		5,101		(17	)		8
Mortgage-backed		177,270		(1,068	)		33		1,066		(14	)		5		178,336		(1,082	)		38
Collateralized mortgage obligations		256,265		(1,889	)		24		5,218		(54	)		2		261,483		(1,943	)		26
Other securities		-		-			-		3,235		(118	)		2		3,235		(118	)		2
Total securities with unrealized losses	$	624,819	$	(4,283	)		79	$	29,822	$	(388	)		12	$	654,641	$	(4,671	)		91


Investment securities held to maturity:
Mortgage-backed	$	9,325	$	(107	)		1	$	-	$	-			-	$	9,325	$	(107	)		1
Collateralized mortgage obligations		105,604		(281	)		12		41,523		(1,279	)		4		147,127		(1,560	)		16
State & municipal		2,200		(18	)		3		-		-			-		2,200		(18	)		3
Total securities with unrealized losses	$	117,129	$	(406	)		16	$	41,523	$	(1,279	)		4	$	158,652	$	(1,685	)		20

Contractual Maturities of Debt Securities

The following tables set forth information with regard to contractual maturities of debt securities at June 30, 2016:

(In thousands)	Amortized cost		Estimated fair value
Debt securities classified as available for sale
Within one year	$	28,638	$	28,768
From one to five years		278,354		281,204
From five to ten years		154,190		157,898
After ten years		771,623		784,918
	$	1,232,805	$	1,252,788
Debt securities classified as held to maturity
Within one year	$	39,152	$	39,185
From one to five years		23,575		23,863
From five to ten years		118,985		122,641
After ten years		319,128		326,660
	$	500,840	$	512,349

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

- Definition

Tabular disclosure of all investments in certain debt and equity securities for which the entity has the positive intent and ability to hold until maturity.

+ References + Details

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

6 Months Ended

Jun. 30, 2016

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

Portfolio and Class Segments

The following table illustrates the portfolio and class segments for the Company’s loan portfolio:

Portfolio	Class
Commercial Loans	Commercial
	Commercial Real Estate
	Agricultural
	Agricultural Real Estate
	Business Banking
Consumer Loans	Indirect
	Home Equity
	Direct
Residential Real Estate Mortgages

Allowance for Loan Losses by Portfolio

The following tables illustrate the changes in the allowance for loan losses by our portfolio segments for the three and six months ended June 30, 2016 and 2015:

Three months ended June 30,	Commercial Loans			Consumer Loans			Residential Real Estate Mortgages			Unallocated			Total
Balance as of March 31, 2016	$	25,299		$	31,035		$	7,984		$	-		$	64,318
Charge-offs		(649	)		(4,950	)		(268	)		-			(5,867	)
Recoveries		339			907			91			-			1,337
Provision		233			4,479			68			-			4,780
Ending Balance as of June 30, 2016	$	25,222		$	31,471		$	7,875		$	-		$	64,568

Balance as of March 31, 2015	$	31,278		$	26,156		$	7,698		$	227		$	65,359
Charge-offs		(584	)		(4,275	)		(509	)		-			(5,368	)
Recoveries		280			697			93			-			1,070
Provision		(2,648	)		5,736			999			(189	)		3,898
Ending Balance as of June 30, 2015	$	28,326		$	28,314		$	8,281		$	38		$	64,959

Six months ended June 30,	Commercial Loans			Consumer Loans			Residential Real Estate Mortgages			Unallocated			Total
Balance as of December 31, 2015	$	25,545		$	29,253		$	7,960		$	260		$	63,018
Charge-offs		(1,086	)		(10,363	)		(977	)		-			(12,426	)
Recoveries		1,104			1,881			113			-			3,098
Provision		(341	)		10,700			779			(260	)		10,878
Ending Balance as of June 30, 2016	$	25,222		$	31,471		$	7,875		$	-		$	64,568

Balance as of December 31, 2014	$	32,433		$	26,720		$	7,130		$	76		$	66,359
Charge-offs		(1,382	)		(8,653	)		(1,013	)		-			(11,048	)
Recoveries		514			1,445			149			-			2,108
Provision		(3,239	)		8,802			2,015			(38	)		7,540
Ending Balance as of June 30, 2015	$	28,326		$	28,314		$	8,281		$	38		$	64,959

The following tables illustrate the allowance for loan losses and the recorded investment by portfolio segments as of June 30, 2016 and December 31, 2015:

Allowance for Loan Losses and Recorded Investment in Loans

(in thousands)

	Commercial Loans		Consumer Loans		Residential Real Estate Mortgages		Unallocated		Total
As of June 30, 2016
Allowance for loan losses	$	25,222	$	31,471	$	7,875	$	-	$	64,568

Allowance for loans individually evaluated for impairment		3,215		-		-		-		3,215

Allowance for loans collectively evaluated for impairment	$	22,007	$	31,471	$	7,875	$	-	$	61,353

Ending balance of loans	$	2,673,691	$	2,146,314	$	1,219,388			$	6,039,393

Ending balance of originated loans individually evaluated for impairment		20,034		8,190		6,174				34,398
Ending balance of acquired loans individually evaluated for impairment		1,205		-		-				1,205
Ending balance of acquired loans collectively evaluated for impairment		268,814		77,387		214,668				560,869
Ending balance of originated loans collectively evaluated for impairment	$	2,383,638	$	2,060,737	$	998,546			$	5,442,921

As of December 31, 2015
Allowance for loan losses	$	25,545	$	29,253	$	7,960	$	260	$	63,018

Allowance for loans individually evaluated for impairment		2,005		-		-		-		2,005

Allowance for loans collectively evaluated for impairment	$	23,540	$	29,253	$	7,960	$	260	$	61,013

Ending balance of loans	$	2,589,707	$	2,096,646	$	1,196,780			$	5,883,133

Ending balance of originated loans individually evaluated for impairment		12,253		7,693		6,017				25,963
Ending balance of acquired loans individually evaluated for impairment		1,205		-		-				1,205
Ending balance of acquired loans collectively evaluated for impairment		284,524		95,427		230,358				610,309
Ending balance of originated loans collectively evaluated for impairment	$	2,291,725	$	1,993,526	$	960,405			$	5,245,656

Past Due and Nonperforming Loans by Loan Class

The following tables set forth information with regard to past due and nonperforming loans by loan class as of June 30, 2016 and December 31, 2015:

Age Analysis of Past Due Financing Receivables

As of June 30, 2016

(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
ORIGINATED
Commercial Loans
Commercial	$	663	$	85	$	-	$	748	$	3,362	$	656,219	$	660,329
Commercial Real Estate		1,576		-		-		1,576		13,078		1,254,984		1,269,638
Agricultural		86		-		-		86		669		35,007		35,762
Agricultural Real Estate		-		-		-		-		470		29,909		30,379
Business Banking		2,234		461		-		2,695		3,723		401,146		407,564
		4,559		546		-		5,105		21,302		2,377,265		2,403,672

Consumer Loans
Indirect		14,096		3,542		1,398		19,036		1,499		1,528,126		1,548,661
Home Equity		3,499		740		154		4,393		3,241		451,357		458,991
Direct		450		88		20		558		46		60,671		61,275
		18,045		4,370		1,572		23,987		4,786		2,040,154		2,068,927
Residential Real Estate Mortgages		2,695		1,516		27		4,238		6,451		994,031		1,004,720
	$	25,299	$	6,432	$	1,599	$	33,330	$	32,539	$	5,411,450	$	5,477,319

ACQUIRED
Commercial Loans
Commercial	$	-	$	72	$	-	$	72	$	-	$	62,882	$	62,954
Commercial Real Estate		443		-		-		443		1,313		160,176		161,932
Business Banking		420		389		-		809		406		43,918		45,133
		863		461		-		1,324		1,719		266,976		270,019

Consumer Loans
Indirect		105		8		13		126		68		16,407		16,601
Home Equity		368		-		-		368		440		56,679		57,487
Direct		25		21		1		47		23		3,229		3,299
		498		29		14		541		531		76,315		77,387
Residential Real Estate Mortgages		673		642		-		1,315		2,608		210,745		214,668
	$	2,034	$	1,132	$	14	$	3,180	$	4,858	$	554,036	$	562,074
Total Loans	$	27,333	$	7,564	$	1,613	$	36,510	$	37,397	$	5,965,486	$	6,039,393

Age Analysis of Past Due Financing Receivables

As of December 31, 2015

(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
ORIGINATED
Commercial Loans
Commercial	$	782	$	23	$	-	$	805	$	2,817	$	640,696	$	644,318
Commercial Real Estate		39		32		-		71		5,546		1,189,280		1,194,897
Agricultural		94		-		-		94		897		33,633		34,624
Agricultural Real Estate		-		-		-		-		1,046		28,172		29,218
Business Banking		912		394		-		1,306		4,247		395,368		400,921
		1,827		449		-		2,276		14,553		2,287,149		2,303,978

Consumer Loans
Indirect		15,731		2,963		2,271		20,965		1,786		1,454,499		1,477,250
Home Equity		3,396		1,671		340		5,407		4,835		454,473		464,715
Direct		425		201		28		654		49		58,551		59,254
		19,552		4,835		2,639		27,026		6,670		1,967,523		2,001,219
Residential Real Estate Mortgages		3,301		365		696		4,362		7,713		954,347		966,422
	$	24,680	$	5,649	$	3,335	$	33,664	$	28,936	$	5,209,019	$	5,271,619


ACQUIRED
Commercial Loans
Commercial	$	-	$	-	$	-	$	-	$	-	$	68,991	$	68,991
Commercial Real Estate		-		-		-		-		1,313		165,630		166,943
Business Banking		288		-		-		288		307		49,200		49,795
		288		-		-		288		1,620		283,821		285,729

Consumer Loans
Indirect		143		11		1		155		104		27,516		27,775
Home Equity		327		132		-		459		457		62,811		63,727
Direct		76		20		-		96		43		3,786		3,925
		546		163		1		710		604		94,113		95,427
Residential Real Estate Mortgages		1,443		293		326		2,062		2,584		225,712		230,358
	$	2,277	$	456	$	327	$	3,060	$	4,808	$	603,646	$	611,514
Total Loans	$	26,957	$	6,105	$	3,662	$	36,724	$	33,744	$	5,812,665	$	5,883,133

Impaired Loans and Specific Reserve Allocations

The following table provides information on loans specifically evaluated for impairment as of June 30, 2016 and December 31, 2015:

	June 30, 2016							December 31, 2015
(in thousands)	Recorded Investment Balance(Book)		UnpaidPrincipalBalance(Legal)		RelatedAllowance			RecordedInvestmentBalance(Book)		UnpaidPrincipalBalance(Legal)		RelatedAllowance
ORIGINATED
With no related allowance recorded:
Commercial Loans
Commercial	$	2,194	$	2,444				$	2,244	$	2,490
Commercial Real Estate		7,836		7,905					3,165		3,175
Agricultural		18		24					576		1,164
Agricultural Real Estate		608		733					618		744
Business Banking		965		1,027					983		1,033
Total Commercial Loans		11,621		12,133					7,586		8,606

Consumer Loans
Indirect		8		19					12		21
Home Equity		8,182		9,121					7,681		8,574
Direct		-		1					-		-
Total Consumer Loans		8,190		9,141					7,693		8,595

Residential Real Estate Mortgages		6,174		6,893					6,017		6,627
Total		25,985		28,167					21,296		23,828

With an allowance recorded:
Commercial Loans
Commercial		1,022		1,022		$	495		457		457		$	300
Commercial Real Estate		7,391		9,239			1,890		4,210		6,059			970
Total Commercial Loans		8,413		10,261			2,385		4,667		6,516			1,270

ACQUIRED
With an allowance recorded:
Commercial Loans
Commercial Real Estate		1,205		1,321			830		1,205		1,321			735
Total Commercial Loans		1,205		1,321			830		1,205		1,321			735

Total:	$	35,603	$	39,749		$	3,215	$	27,168	$	31,665		$	2,005

	For the three months ended
	June 30, 2016				June 30, 2015
(in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
ORIGINATED
Commercial Loans
Commercial	$	3,126	$	-	$	1,768	$	61
Commercial Real Estate		15,278		-		9,060		41
Agricultural		18		-		19		-
Agricultural Real Estate		610		11		630		12
Business Banking		969		6		975		2
Consumer Loans
Indirect		9		-		16		-
Home Equity		8,223		120		6,692		92
Direct		-		-		1		-
Residential Real Estate Mortgage		6,203		67		4,636		33
Total Originated	$	34,436	$	204	$	23,797	$	241

ACQUIRED
Commercial Loans
Commercial		-		-		2,602		-
Commercial Real Estate		1,205		-		7,205		-
Total Acquired	$	1,205	$	-	$	9,807	$	-
Total Loans	$	35,641	$	204	$	33,604	$	241

	For the six months ended
	June 30, 2016				June 30, 2015
(in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
ORIGINATED
Commercial Loans
Commercial	$	2,972	$	-	$	1,742	$	86
Commercial Real Estate		14,264		74		9,091		82
Agricultural		98		1		19		1
Agricultural Real Estate		613		22		633		23
Business Banking		973		12		932		6
Consumer Loans
Indirect		10		-		11		-
Home Equity		8,093		241		6,560		164
Direct		-		-		1		-
Residential Real Estate Mortgage		6,154		134		4,476		63
Total Originated	$	33,177	$	484	$	23,465	$	425

ACQUIRED
Commercial Loans
Commercial		-		-		2,722		-
Commercial Real Estate		1,205		-		7,176		-
Total Acquired	$	1,205	$	-	$	9,898	$	-
Total Loans	$	34,382	$	484	$	33,363	$	425

Financing Receivable Credit Quality by Loan Class

The following tables illustrate the Company’s credit quality by loan class as of June 30, 2016 and December 31, 2015:

Credit Quality Indicators

As of June 30, 2016

ORIGINATED
Commercial Credit Exposure By Internally Assigned Grade:	Commercial		Commercial Real Estate		Agricultural		Agricultural Real Estate		Total
Pass	$	610,816	$	1,219,723	$	35,365	$	29,448	$	1,895,352
Special Mention		17,774		13,035		1		5		30,815
Substandard		31,739		36,880		388		926		69,933
Doubtful		-		-		8		-		8
Total	$	660,329	$	1,269,638	$	35,762	$	30,379	$	1,996,108

Business Banking Credit Exposure By Internally Assigned Grade:	Business Banking								Total
Non-classified	$	393,805							$	393,805
Classified		13,759								13,759
Total	$	407,564							$	407,564

Consumer Credit Exposure By Payment Activity:	Indirect		Home Equity		Direct				Total
Performing	$	1,545,764	$	455,596	$	61,209			$	2,062,569
Nonperforming		2,897		3,395		66				6,358
Total	$	1,548,661	$	458,991	$	61,275			$	2,068,927

Residential Mortgage Credit Exposure By Payment Activity:	Residential Mortgage								Total
Performing	$	998,242							$	998,242
Nonperforming		6,478								6,478
Total	$	1,004,720							$	1,004,720

Credit Quality Indicators

As of June 30, 2016

ACQUIRED
Commercial Credit Exposure By Internally Assigned Grade:	Commercial		Commercial Real Estate				Total
Pass	$	59,681	$	150,076			$	209,757
Special Mention		1,447		1,799				3,246
Substandard		1,826		10,057				11,883
Total	$	62,954	$	161,932			$	224,886

Business Banking Credit Exposure By Internally Assigned Grade:	Business Banking						Total
Non-classified	$	41,739					$	41,739
Classified		3,394						3,394
Total	$	45,133					$	45,133

Consumer Credit Exposure By Payment Activity:	Indirect		Home Equity		Direct		Total
Performing	$	16,520	$	57,047	$	3,275	$	76,842
Nonperforming		81		440		24		545
Total	$	16,601	$	57,487	$	3,299	$	77,387

Residential Mortgage Credit Exposure By Payment Activity:	Residential Mortgage						Total
Performing	$	212,060					$	212,060
Nonperforming		2,608						2,608
Total	$	214,668					$	214,668

Credit Quality Indicators

As of December 31, 2015

ORIGINATED
Commercial Credit Exposure By Internally Assigned Grade:	Commercial		Commercial Real Estate		Agricultural		Agricultural Real Estate		Total
Pass	$	604,405	$	1,144,832	$	33,565	$	27,320	$	1,810,122
Special Mention		9,726		21,587		311		429		32,053
Substandard		30,187		28,478		740		1,469		60,874
Doubtful		-		-		8		-		8
Total	$	644,318	$	1,194,897	$	34,624	$	29,218	$	1,903,057

Business Banking Credit Exposure By Internally Assigned Grade:	Business Banking								Total
Non-classified	$	386,397							$	386,397
Classified		14,524								14,524
Total	$	400,921							$	400,921
Total
Consumer Credit Exposure By Payment Activity:	Indirect		Home Equity		Direct				Total
Performing	$	1,473,193	$	459,540	$	59,177			$	1,991,910
Nonperforming		4,057		5,175		77				9,309
Total	$	1,477,250	$	464,715	$	59,254			$	2,001,219

Residential Mortgage Credit Exposure By Payment Activity:	Residential Mortgage								Total
Performing	$	958,013							$	958,013
Nonperforming		8,409								8,409
Total	$	966,422							$	966,422

Credit Quality Indicators

As of December 31, 2015

ACQUIRED
Commercial Credit Exposure By Internally Assigned Grade:	Commercial		Commercial Real Estate				Total
Pass	$	67,241	$	154,871			$	222,112
Special Mention		802		2,174				2,976
Substandard		948		9,898				10,846
Total	$	68,991	$	166,943			$	235,934

Business Banking Credit Exposure By Internally Assigned Grade:	Business Banking						Total
Non-classified	$	46,032					$	46,032
Classified		3,763						3,763
Total	$	49,795					$	49,795

Consumer Credit Exposure By Payment Activity:	Indirect		Home Equity		Direct		Total
Performing	$	27,670	$	63,270	$	3,882	$	94,822
Nonperforming		105		457		43		605
Total	$	27,775	$	63,727	$	3,925	$	95,427

Residential Mortgage Credit Exposure By Payment Activity:	Residential Mortgage						Total
Performing	$	227,448					$	227,448
Nonperforming		2,910						2,910
Total	$	230,358					$	230,358

Troubled Debt Restructurings on Financing Receivables

	Three months ended June 30, 2016
	Number of contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
Consumer
Home Equity		2	$	74	$	73
Total Consumer		2		74		73

Residential Real Estate		2		152		151

Total Troubled Debt Restructurings		4	$	226	$	224

	Three months ended June 30, 2015
	Number of contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
Commercial
Commercial		1	$	1,165	$	1,165
Business Banking		1		190		176
Total Commercial		2		1,355		1,341

Consumer
Home Equity		12		1,071		1,128
Total Consumer		12		1,071		1,128

Residential Real Estate		6		370		770

Total Troubled Debt Restructurings		20	$	2,796	$	3,239

	Six months ended June 30, 2016
	Number of contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
Consumer
Home Equity		14	$	1,109	$	1,017
Total Consumer		14		1,109		1,017

Residential Real Estate		6		683		578

Total Troubled Debt Restructurings		20	$	1,792	$	1,595

	Six months ended June 30, 2015
	Number of contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
Commercial
Commercial		1	$	1,165	$	1,165
Business Banking		1		190		176
Total Commercial		2		1,355		1,341

Consumer
Home Equity		31		2,218		2,236
Total Consumer		31		2,218		2,236

Residential Real Estate		15		1,072		1,522

Total Troubled Debt Restructurings		48	$	4,645	$	5,099

	Six months ended June 30, 2016				Six months ended June 30, 2015
	Number of contracts		Recorded Investment		Number of contracts		Recorded Investment
Consumer
Home Equity		-	$	-		4	$	233

Residential Real Estate		1		175		-		-

Total Troubled Debt Restructurings		1	$	175		4	$	233

Securities, Available for Sale (Details) $ in Thousands	Jun. 30, 2016 USD ($) Position	Dec. 31, 2015 USD ($) Position
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,249,478	$ 1,169,337
Unrealized gains	23,762	9,878
Unrealized losses	(1,644)	(4,671)
Estimated fair value	1,271,596	1,174,544
Amortized costs of securities available for sale pledged to secure public deposits	1,600,000	1,400,000
Amortized costs of securities available for sale pledged as collateral for repurchase agreements	193,900	205,900
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	13,829	624,819
12 Months or Longer, Fair Value	6,009	29,822
Total, Fair Value	19,838	654,641
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months Unrealized Losses	(20)	(4,283)
12 months or longer Unrealized Losses	(1,624)	(388)
Total Unrealized Losses	$ (1,644)	$ (4,671)
Unrealized Loss Position, Number of Positions [Abstract]
Less Than 12 Months, Number of Positions \| Position	10	79
12 Months or Longer, Number of Positions \| Position	9	12
Total, Number of Positions \| Position	19	91
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Within one year	$ 28,638
From one to five years	278,354
From five to ten years	154,190
After ten years	771,623
Total, Amortized Cost	1,232,805
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Within one year	28,768
From one to five years	281,204
From five to ten years	157,898
After ten years	784,918
Total, Fair Value	1,252,788
Federal Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	265,194	$ 312,580
Unrealized gains	1,641	203
Unrealized losses	0	(1,511)
Estimated fair value	266,835	311,272
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value		186,685
12 Months or Longer, Fair Value		19,801
Total, Fair Value		206,486
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months Unrealized Losses		(1,312)
12 months or longer Unrealized Losses		(199)
Total Unrealized Losses		$ (1,511)
Unrealized Loss Position, Number of Positions [Abstract]
Less Than 12 Months, Number of Positions \| Position		15
12 Months or Longer, Number of Positions \| Position		2
Total, Number of Positions \| Position		17
State & Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	37,105	$ 31,208
Unrealized gains	537	446
Unrealized losses	(12)	(17)
Estimated fair value	37,630	31,637
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	2,664	4,599
12 Months or Longer, Fair Value	493	502
Total, Fair Value	3,157	5,101
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months Unrealized Losses	(10)	(14)
12 months or longer Unrealized Losses	(2)	(3)
Total Unrealized Losses	$ (12)	$ (17)
Unrealized Loss Position, Number of Positions [Abstract]
Less Than 12 Months, Number of Positions \| Position	6	7
12 Months or Longer, Number of Positions \| Position	1	1
Total, Number of Positions \| Position	7	8
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	$ 145	$ 177,270
12 Months or Longer, Fair Value	1,010	1,066
Total, Fair Value	1,155	178,336
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months Unrealized Losses	(1)	(1,068)
12 months or longer Unrealized Losses	(13)	(14)
Total Unrealized Losses	$ (14)	$ (1,082)
Unrealized Loss Position, Number of Positions [Abstract]
Less Than 12 Months, Number of Positions \| Position	2	33
12 Months or Longer, Number of Positions \| Position	5	5
Total, Number of Positions \| Position	7	38
Mortgage-backed Securities, Issued by US Government-Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 379,583	$ 398,086
Unrealized gains	9,683	4,141
Unrealized losses	(1)	(1,068)
Estimated fair value	389,265	401,159
Mortgage-backed Securities, Issued by US Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	6,886	8,191
Unrealized gains	547	560
Unrealized losses	(13)	(14)
Estimated fair value	7,420	8,737
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	11,020	256,265
12 Months or Longer, Fair Value	0	5,218
Total, Fair Value	11,020	261,483
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months Unrealized Losses	(9)	(1,889)
12 months or longer Unrealized Losses	0	(54)
Total Unrealized Losses	$ (9)	$ (1,943)
Unrealized Loss Position, Number of Positions [Abstract]
Less Than 12 Months, Number of Positions \| Position	2	24
12 Months or Longer, Number of Positions \| Position	0	2
Total, Number of Positions \| Position	2	26
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 492,466	$ 364,936
Unrealized gains	6,942	931
Unrealized losses	(5)	(1,828)
Estimated fair value	499,403	364,039
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	51,571	40,699
Unrealized gains	668	348
Unrealized losses	(4)	(115)
Estimated fair value	52,235	40,932
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	16,673	13,637
Unrealized gains	3,744	3,249
Unrealized losses	(1,609)	(118)
Estimated fair value	18,808	16,768
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	0	0
12 Months or Longer, Fair Value	4,506	3,235
Total, Fair Value	4,506	3,235
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months Unrealized Losses	0	0
12 months or longer Unrealized Losses	(1,609)	(118)
Total Unrealized Losses	$ (1,609)	$ (118)
Unrealized Loss Position, Number of Positions [Abstract]
Less Than 12 Months, Number of Positions \| Position	0	0
12 Months or Longer, Number of Positions \| Position	3	2
Total, Number of Positions \| Position	3	2

Securities, Held to Maturity (Details) $ in Thousands	Jun. 30, 2016 USD ($) Position	Dec. 31, 2015 USD ($) Position
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 500,840	$ 471,031
Unrealized gains	11,777	3,794
Unrealized losses	(268)	(1,685)
Estimated fair value	512,349	473,140
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	918	117,129
12 Months or Longer, Fair Value	39,767	41,523
Total, Fair Value	40,685	158,652
Unrealized Loss Position, Unrealized Losses [Abstract]
Less Than 12 Months, Unrealized Losses	(12)	(406)
12 Months or Longer, Unrealized Losses	(256)	(1,279)
Total, Unrealized Losses	$ (268)	$ (1,685)
Unrealized Loss Position, Number of Positions [Abstract]
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year \| Position	2	16
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year \| Position	4	4
Total, Number of Positions \| Position	6	20
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Within one year	$ 39,152
From one to five years	23,575
From five to ten years	118,985
After ten years	319,128
Amortized cost	500,840	$ 471,031
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Within one year	39,185
From one to five years	23,863
From five to ten years	122,641
After ten years	326,660
Total, Fair Value	512,349	473,140
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value		9,325
12 Months or Longer, Fair Value		0
Total, Fair Value		9,325
Unrealized Loss Position, Unrealized Losses [Abstract]
Less Than 12 Months, Unrealized Losses		(107)
12 Months or Longer, Unrealized Losses		0
Total, Unrealized Losses		$ (107)
Unrealized Loss Position, Number of Positions [Abstract]
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year \| Position		1
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year \| Position		0
Total, Number of Positions \| Position		1
Mortgage-backed Securities, Issued by US Government-Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	51,206	$ 9,432
Unrealized gains	505	0
Unrealized losses	0	(107)
Estimated fair value	51,711	9,325
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Amortized cost	51,206	9,432
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Total, Fair Value	51,711	9,325
Mortgage-backed Securities, Issued by US Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	566	611
Unrealized gains	105	95
Unrealized losses	0	0
Estimated fair value	671	706
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Amortized cost	566	611
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Total, Fair Value	671	706
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	0	105,604
12 Months or Longer, Fair Value	39,767	41,523
Total, Fair Value	39,767	147,127
Unrealized Loss Position, Unrealized Losses [Abstract]
Less Than 12 Months, Unrealized Losses	0	(281)
12 Months or Longer, Unrealized Losses	(256)	(1,279)
Total, Unrealized Losses	$ (256)	$ (1,560)
Unrealized Loss Position, Number of Positions [Abstract]
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year \| Position	0	12
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year \| Position	4	4
Total, Number of Positions \| Position	4	16
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 251,069	$ 272,550
Unrealized gains	6,259	1,411
Unrealized losses	(256)	(1,560)
Estimated fair value	257,072	272,401
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Amortized cost	251,069	272,550
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Total, Fair Value	257,072	272,401
State & Municipal [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	197,999	188,438
Unrealized gains	4,908	2,288
Unrealized losses	(12)	(18)
Estimated fair value	202,895	190,708
Unrealized Loss Position, Fair Value [Abstract]
Less Than 12 Months, Fair Value	918	2,200
12 Months or Longer, Fair Value	0	0
Total, Fair Value	918	2,200
Unrealized Loss Position, Unrealized Losses [Abstract]
Less Than 12 Months, Unrealized Losses	(12)	(18)
12 Months or Longer, Unrealized Losses	0	0
Total, Unrealized Losses	$ (12)	$ (18)
Unrealized Loss Position, Number of Positions [Abstract]
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year \| Position	2	3
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year \| Position	0	0
Total, Number of Positions \| Position	2	3
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Amortized cost	$ 197,999	$ 188,438
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Total, Fair Value	$ 202,895	$ 190,708

Allowance for Loan Losses and Credit Quality of Loans, Allowance for Loan Losses by Portfolio Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 64,318	$ 65,359	$ 63,018	$ 66,359
Charge-offs	(5,867)	(5,368)	(12,426)	(11,048)
Recoveries	1,337	1,070	3,098	2,108
Provision	4,780	3,898	10,878	7,540
Balance, end of period	64,568	64,959	64,568	64,959
Allowance for loan losses for acquired loan portfolio	800	1,900	800	1,900
Provision expense and net charge-offs related to acquired loans	100	100	400	700
Commercial Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	25,299	31,278	25,545	32,433
Charge-offs	(649)	(584)	(1,086)	(1,382)
Recoveries	339	280	1,104	514
Provision	233	(2,648)	(341)	(3,239)
Balance, end of period	25,222	28,326	25,222	28,326
Consumer Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	31,035	26,156	29,253	26,720
Charge-offs	(4,950)	(4,275)	(10,363)	(8,653)
Recoveries	907	697	1,881	1,445
Provision	4,479	5,736	10,700	8,802
Balance, end of period	31,471	28,314	31,471	28,314
Residential Real Estate Mortgages [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	7,984	7,698	7,960	7,130
Charge-offs	(268)	(509)	(977)	(1,013)
Recoveries	91	93	113	149
Provision	68	999	779	2,015
Balance, end of period	7,875	8,281	7,875	8,281
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	0	227	260	76
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	0	(189)	(260)	(38)
Balance, end of period	$ 0	$ 38	$ 0	$ 38

Allowance for Loan Losses and Credit Quality of Loans, Allowance for Loan Losses and Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Allowance loan losses [Abstract]
Allowance for loan losses	$ 64,568	$ 64,318	$ 63,018	$ 64,959	$ 65,359	$ 66,359
Allowance for loans individually evaluated for impairment	3,215		2,005
Allowance for loans collectively evaluated for impairment	61,353		61,013
Ending balance of loans	6,039,393		5,883,133
Commercial Loans [Member]
Allowance loan losses [Abstract]
Allowance for loan losses	25,222	25,299	25,545	28,326	31,278	32,433
Allowance for loans individually evaluated for impairment	3,215		2,005
Allowance for loans collectively evaluated for impairment	22,007		23,540
Ending balance of loans	2,673,691		2,589,707
Consumer Loans [Member]
Allowance loan losses [Abstract]
Allowance for loan losses	31,471	31,035	29,253	28,314	26,156	26,720
Allowance for loans individually evaluated for impairment	0		0
Allowance for loans collectively evaluated for impairment	31,471		29,253
Ending balance of loans	2,146,314		2,096,646
Residential Real Estate Mortgages [Member]
Allowance loan losses [Abstract]
Allowance for loan losses	7,875	7,984	7,960	8,281	7,698	7,130
Allowance for loans individually evaluated for impairment	0		0
Allowance for loans collectively evaluated for impairment	7,875		7,960
Ending balance of loans	1,219,388		1,196,780
Unallocated [Member]
Allowance loan losses [Abstract]
Allowance for loan losses	0	$ 0	260	$ 38	$ 227	$ 76
Allowance for loans individually evaluated for impairment	0		0
Allowance for loans collectively evaluated for impairment	0		260
Originated Loans [Member]
Allowance loan losses [Abstract]
Ending balance of loans	5,477,319		5,271,619
Ending balance of loans individually evaluated for impairment	34,398		25,963
Ending balance of loans collectively evaluated for impairment	5,442,921		5,245,656
Originated Loans [Member] \| Commercial Loans [Member]
Allowance loan losses [Abstract]
Ending balance of loans	2,403,672		2,303,978
Ending balance of loans individually evaluated for impairment	20,034		12,253
Ending balance of loans collectively evaluated for impairment	2,383,638		2,291,725
Originated Loans [Member] \| Consumer Loans [Member]
Allowance loan losses [Abstract]
Ending balance of loans	2,068,927		2,001,219
Ending balance of loans individually evaluated for impairment	8,190		7,693
Ending balance of loans collectively evaluated for impairment	2,060,737		1,993,526
Originated Loans [Member] \| Residential Real Estate Mortgages [Member]
Allowance loan losses [Abstract]
Ending balance of loans	1,004,720		966,422
Ending balance of loans individually evaluated for impairment	6,174		6,017
Ending balance of loans collectively evaluated for impairment	998,546		960,405
Acquired Loans [Member]
Allowance loan losses [Abstract]
Ending balance of loans	562,074		611,514
Ending balance of loans individually evaluated for impairment	1,205		1,205
Ending balance of loans collectively evaluated for impairment	560,869		610,309
Acquired Loans [Member] \| Commercial Loans [Member]
Allowance loan losses [Abstract]
Ending balance of loans	270,019		285,729
Ending balance of loans individually evaluated for impairment	1,205		1,205
Ending balance of loans collectively evaluated for impairment	268,814		284,524
Acquired Loans [Member] \| Consumer Loans [Member]
Allowance loan losses [Abstract]
Ending balance of loans	77,387		95,427
Ending balance of loans individually evaluated for impairment	0		0
Ending balance of loans collectively evaluated for impairment	77,387		95,427
Acquired Loans [Member] \| Residential Real Estate Mortgages [Member]
Allowance loan losses [Abstract]
Ending balance of loans	214,668		230,358
Ending balance of loans individually evaluated for impairment	0		0
Ending balance of loans collectively evaluated for impairment	$ 214,668		$ 230,358

Allowance for Loan Losses and Credit Quality of Loans, Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Allowance for Loan Losses and Credit Quality of Loans [Abstract]
Minimum balance for classified loans to be evaluated individually for impairment	$ 500		$ 500
With an allowance recorded [Abstract]
Recorded investment balance (book)	35,603		35,603		$ 27,168
Unpaid principal balance (legal)	39,749		39,749		31,665
Related allowance	3,215		3,215		2,005
Average recorded investment	35,641	$ 33,604	34,382	$ 33,363
Interest income recognized	204	241	484	425
Originated Loans [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	25,985		25,985		21,296
Unpaid principal balance (legal)	28,167		28,167		23,828
With an allowance recorded [Abstract]
Average recorded investment	34,436	23,797	33,177	23,465
Interest income recognized	204	241	484	425
Originated Loans [Member] \| Commercial Loans [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	11,621		11,621		7,586
Unpaid principal balance (legal)	12,133		12,133		8,606
With an allowance recorded [Abstract]
Recorded investment balance (book)	8,413		8,413		4,667
Unpaid principal balance (legal)	10,261		10,261		6,516
Related allowance	2,385		2,385		1,270
Originated Loans [Member] \| Commercial Loans [Member] \| Commercial [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	2,194		2,194		2,244
Unpaid principal balance (legal)	2,444		2,444		2,490
With an allowance recorded [Abstract]
Recorded investment balance (book)	1,022		1,022		457
Unpaid principal balance (legal)	1,022		1,022		457
Related allowance	495		495		300
Average recorded investment	3,126	1,768	2,972	1,742
Interest income recognized	0	61	0	86
Originated Loans [Member] \| Commercial Loans [Member] \| Commercial Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	7,836		7,836		3,165
Unpaid principal balance (legal)	7,905		7,905		3,175
With an allowance recorded [Abstract]
Recorded investment balance (book)	7,391		7,391		4,210
Unpaid principal balance (legal)	9,239		9,239		6,059
Related allowance	1,890		1,890		970
Average recorded investment	15,278	9,060	14,264	9,091
Interest income recognized	0	41	74	82
Originated Loans [Member] \| Commercial Loans [Member] \| Agricultural [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	18		18		576
Unpaid principal balance (legal)	24		24		1,164
With an allowance recorded [Abstract]
Average recorded investment	18	19	98	19
Interest income recognized	0	0	1	1
Originated Loans [Member] \| Commercial Loans [Member] \| Agricultural Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	608		608		618
Unpaid principal balance (legal)	733		733		744
With an allowance recorded [Abstract]
Average recorded investment	610	630	613	633
Interest income recognized	11	12	22	23
Originated Loans [Member] \| Commercial Loans [Member] \| Business Banking [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	965		965		983
Unpaid principal balance (legal)	1,027		1,027		1,033
With an allowance recorded [Abstract]
Average recorded investment	969	975	973	932
Interest income recognized	6	2	12	6
Originated Loans [Member] \| Consumer Loans [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	8,190		8,190		7,693
Unpaid principal balance (legal)	9,141		9,141		8,595
Originated Loans [Member] \| Consumer Loans [Member] \| Indirect [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	8		8		12
Unpaid principal balance (legal)	19		19		21
With an allowance recorded [Abstract]
Average recorded investment	9	16	10	11
Interest income recognized	0	0	0	0
Originated Loans [Member] \| Consumer Loans [Member] \| Home Equity [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	8,182		8,182		7,681
Unpaid principal balance (legal)	9,121		9,121		8,574
With an allowance recorded [Abstract]
Average recorded investment	8,223	6,692	8,093	6,560
Interest income recognized	120	92	241	164
Originated Loans [Member] \| Consumer Loans [Member] \| Direct [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	0		0		0
Unpaid principal balance (legal)	1		1		0
With an allowance recorded [Abstract]
Average recorded investment	0	1	0	1
Interest income recognized	0	0	0	0
Originated Loans [Member] \| Residential Real Estate Mortgages [Member]
With no related allowance recorded [Abstract]
Recorded investment balance (book)	6,174		6,174		6,017
Unpaid principal balance (legal)	6,893		6,893		6,627
With an allowance recorded [Abstract]
Average recorded investment	6,203	4,636	6,154	4,476
Interest income recognized	67	33	134	63
Acquired Loans [Member]
With an allowance recorded [Abstract]
Average recorded investment	1,205	9,807	1,205	9,898
Interest income recognized	0	0	0	0
Acquired Loans [Member] \| Commercial Loans [Member]
With an allowance recorded [Abstract]
Recorded investment balance (book)	1,205		1,205		1,205
Unpaid principal balance (legal)	1,321		1,321		1,321
Related allowance	830		830		735
Acquired Loans [Member] \| Commercial Loans [Member] \| Commercial [Member]
With an allowance recorded [Abstract]
Average recorded investment	0	2,602	0	2,722
Interest income recognized	0	0	0	0
Acquired Loans [Member] \| Commercial Loans [Member] \| Commercial Real Estate [Member]
With an allowance recorded [Abstract]
Recorded investment balance (book)	1,205		1,205		1,205
Unpaid principal balance (legal)	1,321		1,321		1,321
Related allowance	830		830		$ 735
Average recorded investment	1,205	7,205	1,205	7,176
Interest income recognized	$ 0	$ 0	$ 0	$ 0

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic EPS [Abstract]
Weighted average common shares outstanding (in shares)	43,099,000	44,007,000	43,220,000	44,079,000
Net income	$ 19,909	$ 19,281	$ 38,800	$ 37,447
Basic EPS (in dollars per share)	$ 0.46	$ 0.44	$ 0.90	$ 0.85
Diluted EPS [Abstract]
Weighted average common shares outstanding (in shares)	43,009,000	44,007,000	43,220,000	44,079,000
Dilutive effect of common stock options and restricted stock (in shares)	354,000	523,000	364,000	510,000
Weighted average common shares and common share equivalents (in shares)	43,363,000	44,530,000	43,584,000	44,589,000
Net income	$ 19,909	$ 19,281	$ 38,800	$ 37,447
Diluted EPS (in dollars per share)	$ 0.46	$ 0.43	$ 0.89	$ 0.84
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options excluded from calculation of diluted EPS (in shares)	33,179	339,109	25,139	340,034

Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains	$ 1	$ 26	$ 30	$ 40
Interest income	65,777	62,685	130,354	124,851
Salaries and employee benefits	32,931	30,831	65,372	61,013
Income tax expense	(10,257)	(9,757)	(19,988)	(18,947)
Net income	19,909	19,281	38,800	37,447
Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	484	531	959	1,070
Accumulated Net Unrealized Investment Gain (Loss) [Member] \| Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains	(1)	(26)	(30)	(40)
Interest income	280	336	576	671
Income tax expense	(108)	(121)	(213)	(245)
Net income	171	189	333	386
Accumulated Defined Benefit Plans Adjustment [Member] \| Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	(199)	(219)	(398)	(438)
Net income	313	342	626	684
Amortization of Net Losses [Member] \| Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	515	567	1,030	1,133
Amortization of Prior Service Costs [Member] \| Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	$ (3)	$ (6)	$ (6)	$ (11)

Fair Value Measurements and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Securities Available for Sale [Abstract]
Total Securities Available for Sale	$ 1,271,596	$ 1,174,544
Trading Securities	$ 8,591	8,377
Liabilities [Abstract]
Liquidation expense ratio on impaired collateral minimum	10.00%
Liquidation expense ratio on impaired collateral maximum	35.00%
Financial assets [Abstract]
Securities held to maturity	$ 512,349	473,140
Financial liabilities [Abstract]
Time deposits	882,712	908,827
Long-term debt	110,306	130,447
Junior subordinated debt	101,196	101,196
Not Designated as Hedging Instrument [Member] \| Interest Rate Swaps [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	17,800	6,200
Not Designated as Hedging Instrument [Member] \| Interest Rate Swaps [Member] \| Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	17,800	6,200
Not Designated as Hedging Instrument [Member] \| Interest Rate Swaps [Member] \| Customer Derivative Agreement [Member]
Derivatives, Fair Value [Line Items]
Notional amount	288,100	192,600
Not Designated as Hedging Instrument [Member] \| Interest Rate Swaps [Member] \| Offsetting Derivative Counterparty Positions [Member]
Derivatives, Fair Value [Line Items]
Notional amount	288,100	192,600
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional amount	150,000
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Interest Rate Swaps [Member] \| Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	100
Carrying Amount [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Securities held to maturity	500,840	471,031
Financial liabilities [Abstract]
Time deposits	882,712	908,827
Long-term debt	110,306	130,447
Junior subordinated debt	101,196	101,196
Carrying Amount [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Net loans	5,974,825	5,820,115
Estimated Fair Value [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Securities held to maturity	512,349	473,140
Financial liabilities [Abstract]
Time deposits	886,047	903,501
Long-term debt	111,968	131,268
Junior subordinated debt	96,583	97,346
Estimated Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Net loans	6,136,103	5,958,427
Recurring Basis [Member]
Securities Available for Sale [Abstract]
Federal Agency	266,835	311,272
State & municipal	37,630	31,637
Mortgage-backed	396,685	409,896
Collateralized mortgage obligations	551,638	404,971
Other securities	18,808	16,768
Total Securities Available for Sale	1,271,596	1,174,544
Trading Securities	8,591	8,377
Interest Rate Swaps	17,775	6,224
Total	1,297,962	1,189,145
Liabilities [Abstract]
Interest Rate Swaps	17,838	6,224
Total	17,838	6,224
Recurring Basis [Member] \| Quoted Prices in Active Market for Identical Assets (Level I) [Member]
Securities Available for Sale [Abstract]
Federal Agency	0	0
State & municipal	0	0
Mortgage-backed	0	0
Collateralized mortgage obligations	0	0
Other securities	9,458	7,526
Total Securities Available for Sale	9,458	7,526
Trading Securities	8,591	8,377
Interest Rate Swaps	0	0
Total	18,049	15,903
Liabilities [Abstract]
Interest Rate Swaps	0	0
Total	0	0
Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Securities Available for Sale [Abstract]
Federal Agency	266,835	311,272
State & municipal	37,630	31,637
Mortgage-backed	396,685	409,896
Collateralized mortgage obligations	551,638	404,971
Other securities	9,350	9,242
Total Securities Available for Sale	1,262,138	1,167,018
Trading Securities	0	0
Interest Rate Swaps	17,775	6,224
Total	1,279,913	1,173,242
Liabilities [Abstract]
Interest Rate Swaps	17,838	6,224
Total	17,838	6,224
Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Securities Available for Sale [Abstract]
Federal Agency	0	0
State & municipal	0	0
Mortgage-backed	0	0
Collateralized mortgage obligations	0	0
Other securities	0	0
Total Securities Available for Sale	0	0
Trading Securities	0	0
Interest Rate Swaps	0	0
Total	0	0
Liabilities [Abstract]
Interest Rate Swaps	0	0
Total	0	$ 0
Nonrecurring Basis [Member]
Liabilities [Abstract]
Collateral dependent impaired financing receivable with specific reserves	9,600		$ 8,700
Allowance for loan and lease losses collateral dependent impaired loans with specific reserves	$ 3,200		$ 2,900

Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other comprehensive income (loss), net of tax:
Unrealized net holding gains (losses) arising during the period, pre-tax amounts	$ 3,730	$ (5,277)	$ 16,941	$ (434)
Reclassification adjustment for net gains related to securities available for sale included in net income, pre-tax amounts	1	26	30	40
Unrealized losses on derivatives (cash flow hedges), pre-tax amounts	(62)	0	(62)	0
Amortization of unrealized net gains and losses related to the reclassification of available for sale investment securities to held to maturity, pre-tax amounts	280	336	576	671
Amortization of prior service cost and actuarial gains, pre-tax amounts	$ 513	$ 561	$ 1,024	$ 1,122

Consolidated Statements of Stockholders' Equity (unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Consolidated Statements of Stockholders' Equity (unaudited) [Abstract]
Cash dividends - per share (in dollars per share)	$ 0.44	$ 0.43
Purchase of treasury shares (in shares)	675,535	433,351
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit (in shares)	237,824	222,326

Description of Business (Policies)	6 Months Ended
Description of Business (Policies)	Jun. 30, 2016
Description of Business [Abstract]
Nature of Operations	NBT Bancorp Inc. (the “Registrant” or the “Company”) 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 the Registrant 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”), Hathaway Agency, Inc., and 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 Company’s principal sources of revenue are the management fees and dividends it receives from the Bank, NBT Financial and NBT Holdings. The Company’s business, primarily conducted through the Bank but also through its other subsidiaries, consists of providing commercial banking and financial services to customers in its market area, which includes central and upstate New York, northeastern Pennsylvania, northwestern Vermont, western Massachusetts, southern New Hampshire, and southern Maine. 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, principally in non-metropolitan markets, providing a broad array of banking and financial services to retail, commercial, and municipal customers.

Defined Benefit Postretirement Plans (Policies)	6 Months Ended
Defined Benefit Postretirement Plans (Policies)	Jun. 30, 2016
Defined Benefit Postretirement 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, 2016. 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 pension plan in accordance with Employee Retirement Income Security Act of 1974 (“ERISA”) standards. Assets of the plan are invested in publicly traded stocks and bonds. The Company is not required to make contributions to the Plan in 2016 and did not do so during the six months ended June 30, 2016. Market conditions can result in an unusually high degree of volatility and increase the risks and short-term liquidity associated with certain investments held by the Plan which could impact the value of these investments. In addition to the Plan, the Company also 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.” Also, the Company provides certain health care benefits for retired employees. Benefits are 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 postretirement health care benefits. In addition, the Company assumed post-retirement medical life insurance benefits for certain Alliance employees, retirees and their spouses, if applicable, in the Alliance acquisition. These postretirement benefits are referred to herein as “Other Benefits.”

Allowance for Loan Losses and Credit Quality of Loans (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($) Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan portfolio segments \| Segment	3
Commercial Loans [Member] \| Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate loan amount, percentage of appraised value or purchase price of the property, maximum	80.00%
Commercial Loans [Member] \| Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate loan amount, percentage of appraised value or purchase price of the property, maximum	75.00%
Commercial Loans [Member] \| Business Banking [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business banking loans, maximum amount \| $	$ 0.5
Consumer Loans [Member] \| Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of automobile financing to indirect relationships with dealers	75.00%
Principal repayment term of loan, minimum	3 years
Principal repayment term of loan, maximum	6 years
Consumer Loans [Member] \| Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Home equity loan amount, percentage of equity in home, maximum	85.00%
Consumer Loans [Member] \| Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal repayment term of loan, minimum	1 year
Principal repayment term of loan, maximum	10 years
Residential Real Estate Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate loan amount, percentage of appraised value or purchase price of the property, maximum	85.00%

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Securities held to maturity fair value	$ 512,349	$ 473,140
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)	49,651,494	49,651,494
Common stock in treasury, at cost (in shares)	6,658,554	6,220,792

Securities (Policies)	6 Months Ended
Securities (Policies)	Jun. 30, 2016
Securities [Abstract]
Investment, Policy	Management has the intent to hold the securities classified as held to maturity until they mature, at which time it is believed the Company will receive full value for the securities. Furthermore, as of June 30, 2016, management also has the intent to hold, and will not be required to sell, the securities classified as available for sale for a period of time sufficient for a recovery of cost, which may be until maturity. The unrealized losses are due to increases in market interest rates over the yields available at the time the underlying securities were purchased. When necessary, the Company has performed a discounted cash flow analysis to determine whether or not it will receive the contractual principal and interest on certain securities. The fair value is expected to recover as the bonds approach their maturity date or repricing date or if market yields for such investments decline. As of June 30, 2016, management believes the impairments detailed in the table above are temporary and no other-than-temporary impairment losses have been realized in the Company’s consolidated statements of income.

Allowance for Loan Losses and Credit Quality of Loans, Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	$ 36,510	$ 36,724
Non-Accrual	37,397	33,744
Current	5,965,486	5,812,665
Recorded Total Loans	6,039,393	5,883,133
31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	27,333	26,957
61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	7,564	6,105
Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,613	3,662
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded Total Loans	2,673,691	2,589,707
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded Total Loans	2,146,314	2,096,646
Residential Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Recorded Total Loans	1,219,388	1,196,780
Originated Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	33,330	33,664
Non-Accrual	32,539	28,936
Current	5,411,450	5,209,019
Recorded Total Loans	5,477,319	5,271,619
Originated Loans [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	25,299	24,680
Originated Loans [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	6,432	5,649
Originated Loans [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,599	3,335
Originated Loans [Member] \| Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	5,105	2,276
Non-Accrual	21,302	14,553
Current	2,377,265	2,287,149
Recorded Total Loans	2,403,672	2,303,978
Originated Loans [Member] \| Commercial Loans [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	4,559	1,827
Originated Loans [Member] \| Commercial Loans [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	546	449
Originated Loans [Member] \| Commercial Loans [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] \| Commercial Loans [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	748	805
Non-Accrual	3,362	2,817
Current	656,219	640,696
Recorded Total Loans	660,329	644,318
Originated Loans [Member] \| Commercial Loans [Member] \| Commercial [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	663	782
Originated Loans [Member] \| Commercial Loans [Member] \| Commercial [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	85	23
Originated Loans [Member] \| Commercial Loans [Member] \| Commercial [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] \| Commercial Loans [Member] \| Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,576	71
Non-Accrual	13,078	5,546
Current	1,254,984	1,189,280
Recorded Total Loans	1,269,638	1,194,897
Originated Loans [Member] \| Commercial Loans [Member] \| Commercial Real Estate [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,576	39
Originated Loans [Member] \| Commercial Loans [Member] \| Commercial Real Estate [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	32
Originated Loans [Member] \| Commercial Loans [Member] \| Commercial Real Estate [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] \| Commercial Loans [Member] \| Agricultural [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	86	94
Non-Accrual	669	897
Current	35,007	33,633
Recorded Total Loans	35,762	34,624
Originated Loans [Member] \| Commercial Loans [Member] \| Agricultural [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	86	94
Originated Loans [Member] \| Commercial Loans [Member] \| Agricultural [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] \| Commercial Loans [Member] \| Agricultural [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] \| Commercial Loans [Member] \| Agricultural Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Non-Accrual	470	1,046
Current	29,909	28,172
Recorded Total Loans	30,379	29,218
Originated Loans [Member] \| Commercial Loans [Member] \| Agricultural Real Estate [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] \| Commercial Loans [Member] \| Agricultural Real Estate [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] \| Commercial Loans [Member] \| Agricultural Real Estate [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] \| Commercial Loans [Member] \| Business Banking [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,695	1,306
Non-Accrual	3,723	4,247
Current	401,146	395,368
Recorded Total Loans	407,564	400,921
Originated Loans [Member] \| Commercial Loans [Member] \| Business Banking [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,234	912
Originated Loans [Member] \| Commercial Loans [Member] \| Business Banking [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	461	394
Originated Loans [Member] \| Commercial Loans [Member] \| Business Banking [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Originated Loans [Member] \| Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	23,987	27,026
Non-Accrual	4,786	6,670
Current	2,040,154	1,967,523
Recorded Total Loans	2,068,927	2,001,219
Originated Loans [Member] \| Consumer Loans [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	18,045	19,552
Originated Loans [Member] \| Consumer Loans [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	4,370	4,835
Originated Loans [Member] \| Consumer Loans [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,572	2,639
Originated Loans [Member] \| Consumer Loans [Member] \| Indirect [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	19,036	20,965
Non-Accrual	1,499	1,786
Current	1,528,126	1,454,499
Recorded Total Loans	1,548,661	1,477,250
Originated Loans [Member] \| Consumer Loans [Member] \| Indirect [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	14,096	15,731
Originated Loans [Member] \| Consumer Loans [Member] \| Indirect [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	3,542	2,963
Originated Loans [Member] \| Consumer Loans [Member] \| Indirect [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,398	2,271
Originated Loans [Member] \| Consumer Loans [Member] \| Home Equity [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	4,393	5,407
Non-Accrual	3,241	4,835
Current	451,357	454,473
Recorded Total Loans	458,991	464,715
Originated Loans [Member] \| Consumer Loans [Member] \| Home Equity [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	3,499	3,396
Originated Loans [Member] \| Consumer Loans [Member] \| Home Equity [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	740	1,671
Originated Loans [Member] \| Consumer Loans [Member] \| Home Equity [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	154	340
Originated Loans [Member] \| Consumer Loans [Member] \| Direct [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	558	654
Non-Accrual	46	49
Current	60,671	58,551
Recorded Total Loans	61,275	59,254
Originated Loans [Member] \| Consumer Loans [Member] \| Direct [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	450	425
Originated Loans [Member] \| Consumer Loans [Member] \| Direct [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	88	201
Originated Loans [Member] \| Consumer Loans [Member] \| Direct [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	20	28
Originated Loans [Member] \| Residential Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	4,238	4,362
Non-Accrual	6,451	7,713
Current	994,031	954,347
Recorded Total Loans	1,004,720	966,422
Originated Loans [Member] \| Residential Real Estate Mortgages [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,695	3,301
Originated Loans [Member] \| Residential Real Estate Mortgages [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,516	365
Originated Loans [Member] \| Residential Real Estate Mortgages [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	27	696
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	3,180	3,060
Non-Accrual	4,858	4,808
Current	554,036	603,646
Recorded Total Loans	562,074	611,514
Acquired Loans [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	2,034	2,277
Acquired Loans [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,132	456
Acquired Loans [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	14	327
Acquired Loans [Member] \| Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,324	288
Non-Accrual	1,719	1,620
Current	266,976	283,821
Recorded Total Loans	270,019	285,729
Acquired Loans [Member] \| Commercial Loans [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	863	288
Acquired Loans [Member] \| Commercial Loans [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	461	0
Acquired Loans [Member] \| Commercial Loans [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] \| Commercial Loans [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	72	0
Non-Accrual	0	0
Current	62,882	68,991
Recorded Total Loans	62,954	68,991
Acquired Loans [Member] \| Commercial Loans [Member] \| Commercial [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] \| Commercial Loans [Member] \| Commercial [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	72	0
Acquired Loans [Member] \| Commercial Loans [Member] \| Commercial [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] \| Commercial Loans [Member] \| Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	443	0
Non-Accrual	1,313	1,313
Current	160,176	165,630
Recorded Total Loans	161,932	166,943
Acquired Loans [Member] \| Commercial Loans [Member] \| Commercial Real Estate [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	443	0
Acquired Loans [Member] \| Commercial Loans [Member] \| Commercial Real Estate [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] \| Commercial Loans [Member] \| Commercial Real Estate [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] \| Commercial Loans [Member] \| Business Banking [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	809	288
Non-Accrual	406	307
Current	43,918	49,200
Recorded Total Loans	45,133	49,795
Acquired Loans [Member] \| Commercial Loans [Member] \| Business Banking [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	420	288
Acquired Loans [Member] \| Commercial Loans [Member] \| Business Banking [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	389	0
Acquired Loans [Member] \| Commercial Loans [Member] \| Business Banking [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] \| Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	541	710
Non-Accrual	531	604
Current	76,315	94,113
Recorded Total Loans	77,387	95,427
Acquired Loans [Member] \| Consumer Loans [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	498	546
Acquired Loans [Member] \| Consumer Loans [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	29	163
Acquired Loans [Member] \| Consumer Loans [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	14	1
Acquired Loans [Member] \| Consumer Loans [Member] \| Indirect [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	126	155
Non-Accrual	68	104
Current	16,407	27,516
Recorded Total Loans	16,601	27,775
Acquired Loans [Member] \| Consumer Loans [Member] \| Indirect [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	105	143
Acquired Loans [Member] \| Consumer Loans [Member] \| Indirect [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	8	11
Acquired Loans [Member] \| Consumer Loans [Member] \| Indirect [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	13	1
Acquired Loans [Member] \| Consumer Loans [Member] \| Home Equity [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	368	459
Non-Accrual	440	457
Current	56,679	62,811
Recorded Total Loans	57,487	63,727
Acquired Loans [Member] \| Consumer Loans [Member] \| Home Equity [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	368	327
Acquired Loans [Member] \| Consumer Loans [Member] \| Home Equity [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	132
Acquired Loans [Member] \| Consumer Loans [Member] \| Home Equity [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	0	0
Acquired Loans [Member] \| Consumer Loans [Member] \| Direct [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	47	96
Non-Accrual	23	43
Current	3,229	3,786
Recorded Total Loans	3,299	3,925
Acquired Loans [Member] \| Consumer Loans [Member] \| Direct [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	25	76
Acquired Loans [Member] \| Consumer Loans [Member] \| Direct [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	21	20
Acquired Loans [Member] \| Consumer Loans [Member] \| Direct [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1	0
Acquired Loans [Member] \| Residential Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	1,315	2,062
Non-Accrual	2,608	2,584
Current	210,745	225,712
Recorded Total Loans	214,668	230,358
Acquired Loans [Member] \| Residential Real Estate Mortgages [Member] \| 31-60 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	673	1,443
Acquired Loans [Member] \| Residential Real Estate Mortgages [Member] \| 61-90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	642	293
Acquired Loans [Member] \| Residential Real Estate Mortgages [Member] \| Greater Than 90 Days Past Due Accruing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due Accruing	$ 0	$ 326

Allowance for Loan Losses and Credit Quality of Loans, Credit Quality by Loan Class (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	$ 6,039,393	$ 5,883,133
Commercial Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,673,691	2,589,707
Consumer Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,146,314	2,096,646
Residential Mortgage Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,219,388	1,196,780
Originated Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	5,477,319	5,271,619
Originated Loans [Member] \| Commercial Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,403,672	2,303,978
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Total Commercial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,996,108	1,903,057
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Total Commercial and Agricultural [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,895,352	1,810,122
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Total Commercial and Agricultural [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	30,815	32,053
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Total Commercial and Agricultural [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	69,933	60,874
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Total Commercial and Agricultural [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	8	8
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	660,329	644,318
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	610,816	604,405
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	17,774	9,726
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	31,739	30,187
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	0	0
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,269,638	1,194,897
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial Real Estate [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,219,723	1,144,832
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial Real Estate [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	13,035	21,587
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial Real Estate [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	36,880	28,478
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial Real Estate [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	0	0
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	35,762	34,624
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Agricultural [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	35,365	33,565
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Agricultural [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1	311
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Agricultural [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	388	740
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Agricultural [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	8	8
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Agricultural Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	30,379	29,218
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Agricultural Real Estate [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	29,448	27,320
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Agricultural Real Estate [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	5	429
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Agricultural Real Estate [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	926	1,469
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Agricultural Real Estate [Member] \| Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	0	0
Originated Loans [Member] \| Commercial Credit Exposure [Member] \| Business Banking [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	407,564	400,921
Originated Loans [Member] \| Business Banking Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	407,564	400,921
Originated Loans [Member] \| Business Banking Credit Exposure [Member] \| Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	393,805	386,397
Originated Loans [Member] \| Business Banking Credit Exposure [Member] \| Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	13,759	14,524
Originated Loans [Member] \| Business Banking Credit Exposure [Member] \| Business Banking [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	407,564	400,921
Originated Loans [Member] \| Business Banking Credit Exposure [Member] \| Business Banking [Member] \| Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	393,805	386,397
Originated Loans [Member] \| Business Banking Credit Exposure [Member] \| Business Banking [Member] \| Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	13,759	14,524
Originated Loans [Member] \| Consumer Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,068,927	2,001,219
Originated Loans [Member] \| Consumer Credit Exposure [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,062,569	1,991,910
Originated Loans [Member] \| Consumer Credit Exposure [Member] \| Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	6,358	9,309
Originated Loans [Member] \| Consumer Credit Exposure [Member] \| Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,548,661	1,477,250
Originated Loans [Member] \| Consumer Credit Exposure [Member] \| Indirect [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,545,764	1,473,193
Originated Loans [Member] \| Consumer Credit Exposure [Member] \| Indirect [Member] \| Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,897	4,057
Originated Loans [Member] \| Consumer Credit Exposure [Member] \| Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	458,991	464,715
Originated Loans [Member] \| Consumer Credit Exposure [Member] \| Home Equity [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	455,596	459,540
Originated Loans [Member] \| Consumer Credit Exposure [Member] \| Home Equity [Member] \| Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,395	5,175
Originated Loans [Member] \| Consumer Credit Exposure [Member] \| Direct [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	61,275	59,254
Originated Loans [Member] \| Consumer Credit Exposure [Member] \| Direct [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	61,209	59,177
Originated Loans [Member] \| Consumer Credit Exposure [Member] \| Direct [Member] \| Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	66	77
Originated Loans [Member] \| Residential Mortgage Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,004,720	966,422
Originated Loans [Member] \| Residential Mortgage Credit Exposure [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	998,242	958,013
Originated Loans [Member] \| Residential Mortgage Credit Exposure [Member] \| Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	6,478	8,409
Originated Loans [Member] \| Residential Mortgage Credit Exposure [Member] \| Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,004,720	966,422
Originated Loans [Member] \| Residential Mortgage Credit Exposure [Member] \| Residential Mortgage [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	998,242	958,013
Originated Loans [Member] \| Residential Mortgage Credit Exposure [Member] \| Residential Mortgage [Member] \| Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	6,478	8,409
Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	562,074	611,514
Acquired Loans [Member] \| Commercial Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	270,019	285,729
Acquired Loans [Member] \| Commercial Credit Exposure [Member] \| Total Commercial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	224,886	235,934
Acquired Loans [Member] \| Commercial Credit Exposure [Member] \| Total Commercial and Agricultural [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	209,757	222,112
Acquired Loans [Member] \| Commercial Credit Exposure [Member] \| Total Commercial and Agricultural [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,246	2,976
Acquired Loans [Member] \| Commercial Credit Exposure [Member] \| Total Commercial and Agricultural [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	11,883	10,846
Acquired Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	62,954	68,991
Acquired Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	59,681	67,241
Acquired Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,447	802
Acquired Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,826	948
Acquired Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	161,932	166,943
Acquired Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial Real Estate [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	150,076	154,871
Acquired Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial Real Estate [Member] \| Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,799	2,174
Acquired Loans [Member] \| Commercial Credit Exposure [Member] \| Commercial Real Estate [Member] \| Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	10,057	9,898
Acquired Loans [Member] \| Commercial Credit Exposure [Member] \| Business Banking [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	45,133	49,795
Acquired Loans [Member] \| Business Banking Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	45,133	49,795
Acquired Loans [Member] \| Business Banking Credit Exposure [Member] \| Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	41,739	46,032
Acquired Loans [Member] \| Business Banking Credit Exposure [Member] \| Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,394	3,763
Acquired Loans [Member] \| Business Banking Credit Exposure [Member] \| Business Banking [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	45,133	49,795
Acquired Loans [Member] \| Business Banking Credit Exposure [Member] \| Business Banking [Member] \| Non-classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	41,739	46,032
Acquired Loans [Member] \| Business Banking Credit Exposure [Member] \| Business Banking [Member] \| Classified [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,394	3,763
Acquired Loans [Member] \| Consumer Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	77,387	95,427
Acquired Loans [Member] \| Consumer Credit Exposure [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	76,842	94,822
Acquired Loans [Member] \| Consumer Credit Exposure [Member] \| Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	545	605
Acquired Loans [Member] \| Consumer Credit Exposure [Member] \| Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	16,601	27,775
Acquired Loans [Member] \| Consumer Credit Exposure [Member] \| Indirect [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	16,520	27,670
Acquired Loans [Member] \| Consumer Credit Exposure [Member] \| Indirect [Member] \| Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	81	105
Acquired Loans [Member] \| Consumer Credit Exposure [Member] \| Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	57,487	63,727
Acquired Loans [Member] \| Consumer Credit Exposure [Member] \| Home Equity [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	57,047	63,270
Acquired Loans [Member] \| Consumer Credit Exposure [Member] \| Home Equity [Member] \| Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	440	457
Acquired Loans [Member] \| Consumer Credit Exposure [Member] \| Direct [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,299	3,925
Acquired Loans [Member] \| Consumer Credit Exposure [Member] \| Direct [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,275	3,882
Acquired Loans [Member] \| Consumer Credit Exposure [Member] \| Direct [Member] \| Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	24	43
Acquired Loans [Member] \| Residential Mortgage Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	214,668	230,358
Acquired Loans [Member] \| Residential Mortgage Credit Exposure [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	212,060	227,448
Acquired Loans [Member] \| Residential Mortgage Credit Exposure [Member] \| Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	2,608	2,910
Acquired Loans [Member] \| Residential Mortgage Credit Exposure [Member] \| Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	214,668	230,358
Acquired Loans [Member] \| Residential Mortgage Credit Exposure [Member] \| Residential Mortgage [Member] \| Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	212,060	227,448
Acquired Loans [Member] \| Residential Mortgage Credit Exposure [Member] \| Residential Mortgage [Member] \| Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	$ 2,608	$ 2,910

Allowance for Loan Losses and Credit Quality of Loans, Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) Contract	Jun. 30, 2015 USD ($) Contract	Jun. 30, 2016 USD ($) Contract	Jun. 30, 2015 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Period of sustained repayment performance for nonperforming TDRs to be returned to performing status			6 months
Number of contracts \| Contract	4	20	20	48
Pre-modification outstanding recorded investment	$ 226	$ 2,796	$ 1,792	$ 4,645
Post-modification outstanding recorded investment	$ 224	$ 3,239	$ 1,595	$ 5,099
Number of TDR loans with subsequent default \| Contract			1	4
Outstanding recorded investment on TDR loans with subsequent default			$ 175	$ 233
Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts \| Contract		2		2
Pre-modification outstanding recorded investment		$ 1,355		$ 1,355
Post-modification outstanding recorded investment		$ 1,341		$ 1,341
Commercial Loans [Member] \| Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts \| Contract		1		1
Pre-modification outstanding recorded investment		$ 1,165		$ 1,165
Post-modification outstanding recorded investment		$ 1,165		$ 1,165
Commercial Loans [Member] \| Business Banking [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts \| Contract		1		1
Pre-modification outstanding recorded investment		$ 190		$ 190
Post-modification outstanding recorded investment		$ 176		$ 176
Consumer Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts \| Contract	2	12	14	31
Pre-modification outstanding recorded investment	$ 74	$ 1,071	$ 1,109	$ 2,218
Post-modification outstanding recorded investment	$ 73	$ 1,128	$ 1,017	$ 2,236
Consumer Loans [Member] \| Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts \| Contract	2	12	14	31
Pre-modification outstanding recorded investment	$ 74	$ 1,071	$ 1,109	$ 2,218
Post-modification outstanding recorded investment	$ 73	$ 1,128	$ 1,017	$ 2,236
Number of TDR loans with subsequent default \| Contract			0	4
Outstanding recorded investment on TDR loans with subsequent default			$ 0	$ 233
Residential Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts \| Contract	2	6	6	15
Pre-modification outstanding recorded investment	$ 152	$ 370	$ 683	$ 1,072
Post-modification outstanding recorded investment	$ 151	$ 770	$ 578	$ 1,522
Number of TDR loans with subsequent default \| Contract			1	0
Outstanding recorded investment on TDR loans with subsequent default			$ 175	$ 0

Commitments and Contingencies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Commitment to Extend Credits and Unused Lines of Credit [Member]
Guarantor Obligations [Line Items]
Commitments - maximum potential obligation	$ 1,400.0	$ 1,300.0
Standby Letters of Credit [Member]
Guarantor Obligations [Line Items]
Obligation instrument term	5 years
Commitments - maximum potential obligation	$ 42.4	31.5
Commercial Letters of Credit [Member]
Guarantor Obligations [Line Items]
Commitments - maximum potential obligation	$ 0.0	$ 11.3