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- --------------------------------------------------------------------------------
FOR IMMEDIATE RELEASE

ATTENTION: FINANCIAL AND BUSINESS EDITORS

- --------------------------------------------------------------------------------

BSB Contact: Thomas L. Thorn   NBT Contact: Daryl R. Forsythe
             607-779-2584                   607-337-6416

                                       Pursuant to Rule 425 under the Securities
                                       Act of 1933 and deemed filed pursuant to
                                       Rule 14a-12 under the Securities Exchange
                                       Act of 1934.

                BSB, NBT PARTNER WITH ADSFS TO MANAGE INTEGRATION

    NORWICH, NY and BINGHAMTON,  NY (June 30, 2000) - NBT Bancorp Inc. (NBT) and
BSB Bancorp,  Inc. (BSB) announce that ADS Financial  Services Solutions (ADSFS)
is assisting the companies with  integration  activities  associated  with their
current merger initiatives.

    BSB and NBT  announced a  definitive  agreement  to merge on April 20, 2000.
This merger,  currently pending regulatory and stockholder approval, will create
a financial  services holding company with three direct  operating  subsidiaries
including two community banks and a financial services company.

    o    BSB  Bank & Trust  and  NBT  Bank,  the  companies'  principal  banking
         subsidiaries, will be combined to create one of the largest independent
         community banks in Upstate New York.

    o    LA Bank, whose corporate  offices are in Scranton,  PA, joined NBT as a
         result of the merger with Lake Ariel Bancorp,  Inc. in February 2000. A
         merger  with  a  second  Pennsylvania  bank  holding  company,  Pioneer
         American  Holding Company Corp., is scheduled to close on July 1, 2000.
         Subsequent to the Pioneer American merger, LA Bank and Pioneer American
         Bank will be combined to form one of the largest independent  community
         banks in Northeastern Pennsylvania.

    o    NBT created a financial  services  company in September  1999 to expand
         the  company's  menu of  financial  services  beyond  traditional  bank
         product  offerings.  This  subsidiary  will oversee and  coordinate the
         combined companies' trust and investment operations.

    Daryl R. Forsythe, president and chief executive officer of NBT, will become
the chairman,  president and chief  executive  officer of the combined  company.
Forsythe  commented,  "Our



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affiliation with ADSFS is an important step in the successful integration of our
companies.  Our current  merger  initiatives  will  create a financial  services
holding company  positioned for significant  growth in the future. By partnering
with ADSFS,  we will  benefit  from their  considerable  experience  in bringing
financial institutions together."

    Tom Thorn,  acting president and chief executive officer of BSB,  concurred,
stating,  "ADSFS is a highly regarded firm in the financial  services  industry.
Their  expertise  will provide our team with a key resource for  assisting us in
managing our integration efforts."

    Founded   in  1980  and  based  in  Quincy,   Massachusetts,   ADSFS  is  an
international  information  technology  consulting  firm focused  exclusively on
partnering  with financial  services  institutions  to manage change.  ADSFS has
assisted many financial  institutions in their  integration  efforts,  including
other major bank holding companies.

Forward-Looking Information

     This news release contains statements  regarding the projected  performance
of NBT Bancorp,  Pioneer  American  Bank,  LA Bank and BSB Bancorp on a combined
basis.  These  statements  constitute  forward-looking  information  within  the
meaning of the Private Securities  Litigation Reform Act of 1995. Actual results
may differ materially from the projections  discussed in this release since such
projections  involve  significant  risks and  uncertainties.  Factors that might
cause such differences  include,  but are not limited to: competitive  pressures
among financial  institutions  increasing  significantly;  economic  conditions,
either  nationally  or locally in areas in which NBT Bancorp,  Pioneer  American
Bank, LA Bank and BSB Bancorp conduct their operations being less favorable than
expected; the cost and effort required to integrate aspects of the operations of
the companies being more difficult than expected; expected cost savings from the
merger not being  fully  realized or realized  within the  expected  time frame;
legislation  or  regulatory  changes which  adversely  affect the ability of the
combined company to conduct its current or future operations.  NBT disclaims any
obligation to update any such factors or to publicly  announce the result of any
revisions to any of the  forward-looking  statements  included herein to reflect
future events or developments.

     This press release may be deemed to be solicitation  material in respect of
the proposed merger of BSB Bancorp,  Inc.  ("BSB") with NBT Bancorp Inc. ("NBT")
pursuant to an Agreement  and Plan of Merger,  dated as of April 19,  2000,  and
amended as of May 17, 2000, by



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and between NBT and BSB (the "Agreement"). Filing of this press release is being
made  in  connection   with   Regulation   of  Takeovers  and  Security   Holder
Communications (Release No. 33-7760, 34-42055) promulgated by the Securities and
Exchange Commission ("SEC").

    NBT  and  its  directors  and  executive   officers  may  be  deemed  to  be
participants  in the  solicitation  of proxies  in  respect of the  transactions
contemplated by the Agreement.  These directors and executive  officers  include
the following: Daryl R. Forsythe, Michael J. Chewens, Martin A. Dietrich, Joe C.
Minor, John D. Roberts,  Everett A. Gilmour, J. Peter Chaplin, Peter B. Gregory,
William C. Gumble,  Bruce D. Howe,  Andrew S.  Kowalczyk,  Jr., Dan B. Marshman,
John G. Martines, John C. Mitchell, William L. Owens and Paul O. Stillman. As of
March 31, 2000, these directors and executive officers beneficially owned in the
aggregate 1,417,878 shares, or approximately  7.83%, of NBT's outstanding common
stock.  Additional information about the directors and executive officers of NBT
is included in NBT's proxy statement for its 2000 Annual Meeting of shareholders
dated April 3, 2000.

    BSB and certain other  persons named below may be deemed to be  participants
in the  solicitation  of proxies of BSB's  shareholders  to approve the proposed
merger  transaction  between BSB and NBT. The participants in this  solicitation
may include the  directors  of BSB:  Ferris G. Akel,  Robert W. Allen,  Diana J.
Bendz,  William C. Craine,  John P.  Driscoll,  Ann G. Higbee,  Thomas F. Kelly,
David A. Niermeyer, Mark T. O'Neil, Jr., William H. Rincker and Thomas L. Thorn;
as well as the  executive  officers  of BSB:  Glenn  R.  Small,  Executive  Vice
President; Arthur C. Smith, Executive Vice President;  Rexford C. Decker, Senior
Vice President and Chief  Financial  Officer;  Larry G.  Denniston,  Senior Vice
President and Corporate  Secretary;  Douglas R. Johnson,  Senior Vice President;
and Matthew W. Schaefer, Senior Vice President and Chief Information Officer. As
of March 31, 2000,  the  directors and  executive  officers of BSB  beneficially
owned in the  aggregate  approximately  1,039,463  shares  of BSB's  outstanding
common  stock,  representing  approximately  9.90% of BSB's  outstanding  common
stock.  Additional information about the directors and executive officers of BSB
is included in BSB's proxy statement for its 2000 Annual Meeting of shareholders
filed with the SEC on April 3, 2000.

    In  connection  with  the  proposed  merger,  NBT will  file  with the SEC a
registration  statement on SEC Form S-4. The registration statement will contain
a joint proxy  statement/prospectus,  which will describe the proposed merger of
NBT and BSB and the proposed terms and



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conditions of the merger. Stockholders of NBT and BSB are encouraged to read the
registration  statement  and  joint  proxy  statement/prospectus  because  these
documents  will  contain  important  information  about  the  merger.  After the
registration  statement  is filed with the SEC, it will be  available  for free,
both on the SEC's web site  (www.sec.gov)  or by contacting NBT Bancorp Inc., 52
South  Broad  Street,  Norwich,  New York  13815,  Attention:  John D.  Roberts,
telephone  (607)  337-6541;  or  BSB  Bancorp,   Inc.,  58-68  Exchange  Street,
Binghamton,  New York 13901,  Attention:  Larry G.  Denniston,  telephone  (607)
779-2406.

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