Business Editors

         NORWICH, NY/BINGHAMTON, NY--(BUSINESS WIRE)--April 20,2000--NBT Bancorp
Inc.  (NBT) and BSB  Bancorp,  Inc.  (BSB)  today  announced  the  signing  of a
definitive  agreement  to merge.  This  strategic  alliance  will  create a bank
holding company with assets of $4.7 billion and proforma  market  capitalization
of approximately $539 million.  The holding company will adopt a new name before
the merger occurs.
         Under the terms of the  agreement,  BSB  stockholders  will receive two
shares of NBT common stock for each share of BSB held.  The  combined  company's
15-seat board of directors  will be made up of seven  directors from BSB and six
from  NBT  plus  one  from  NBT's  newly  acquired  Lake  Ariel  Bancorp,   Inc.
Pennsylvania  subsidiary and one from the Pioneer America Holding Company Corp.,
subject to the closing of the merger of that company  with NBT. The  transaction
will  be  a  tax-free  exchange  of  shares  and  will  be  accounted  for  as a
pooling-of-interests.  Based upon NBT's  closing  share price on April 19, 2000,
the  transaction  values each BSB share at $24, a premium of 34 percent to BSB's
closing  share  price on that  date.  The  total  transaction  is valued at $251
million.  Common  stockholders  of NBT will have ownership of  approximately  53
percent  of the  combined  company  while  BSB's  common  stockholders  will own
approximately 47 percent,  assuming  consummation of NBT's previously  announced
agreement to merge with Pioneer American Holding Company Corp.
         As a result of the merger, the principal banking subsidiaries, NBT Bank
and BSB Bank & Trust, will be combined to create one of the largest  independent
community  banks in upstate New York.  The new bank will serve 12 counties  from
more than 55 offices and over 100 ATMs. The resulting bank will adopt a new name
prior to the merger.  The  combined  company  will have three  direct  operating
subsidiaries including two community banks and a financial services company.
         NBT Financial  Services,  Inc. was created in September of last year to
concentrate on expanding  NBT's menu of financial  services  beyond  traditional
bank product  offerings.  The company  recently  announced the acquisition of M.
Griffith,  Inc., a securities firm in Utica, NY, offering investment,  financial
advisory and asset-management services. Following the merger of NBT and BSB, the
financial services company will be given a new name that correlates with the new
holding  company  and bank  names.  Joe C.  Minor will  continue  in his role as
president  of NBT  Financial  Services and will assume the position of its chief
executive officer. This subsidiary,  which will include the trust and investment
division,  will be based in Norwich,  NY. The Trust and Investment Division will
be managed by BSB senior vice  president  Douglas  Johnson  upon the  previously
announced  retirement,  at merger closing,  of NBT executive vice president John
Roberts.
         LA Bank,  whose corporate  offices are located in Scranton,  PA, joined
NBT as a result of the merger with Lake Ariel  Bancorp,  Inc.  on  February  17,
2000.  NBT has a definitive  agreement to merge with  Pioneer  American  Holding
Company Corp., also based in northeastern Pennsylvania. NBT announced today that
the  Board  of  Governors  of the  Federal  Reserve  System  and  the  State  of
Pennsylvania  Department  of Banking  have given  clearance  to proceed with the
merger.  Upon completion of the Pioneer merger,  which is subject to approval of
the  stockholders of NBT and Pioneer,  LA Bank and Pioneer American Bank will be
combined to form one of the largest independent  community banks in northeastern
Pennsylvania.





         On July 1, 1999, BSB Bancorp  acquired  Skaneateles  Bancorp  expanding
BSB's  presence in the Syracuse  area.  Recently BSB Bank & Trust  continued its
expansion with the addition of its ninth Broome County branch office.
         Daryl  R.  Forsythe,  president  and  chief  executive  officer  of NBT
Bancorp, will become the chairman,  president and chief executive officer of the
combined company and William C. Craine,  chairman of BSB Bancorp will become the
vice chairman of the combined  company and chairman of the executive  committee.
NBT Bank's  president and chief  operating  officer,  Martin A.  Dietrich,  will
become the president and chief operating officer of the company's New York bank.
Michael J. Chewens,  executive vice president and chief financial officer of NBT
Bancorp,  will serve as chief financial officer for the combined company.  Other
members of the executive  management  teams at NBT and BSB will retain key roles
including:  Glenn R. Small and John R.  Bradley,  executive  vice  presidents of
lending and Larry Denniston, senior vice president and corporate secretary.
         The  corporate  offices  of the  combined  company  will be  located in
Binghamton.  Other major bank  functions  will be conducted  from the  company's
Norwich, Binghamton and Scranton locations following the merger. It is estimated
that the combined company will reduce its operating expenses by approximately $7
million  annually.  Upon the full  implementation of these  aforementioned  cost
savings, the transaction is anticipated to become accretive in 2001.
         The  merger,  which  has been  unanimously  approved  by the  boards of
directors  of NBT and BSB, is subject to  standard  regulatory  and  shareholder
approvals and is expected to close in the fourth quarter of 2000.
         Daryl Forsythe commented, "This merger is a great strategic fit for NBT
and BSB. We offer similar  products and  services,  and the markets we serve are
contiguous.  By far, the most  important  common ground we have is our community
banking philosophy. Bringing these two successful companies together will create
a solid  foundation  that will  allow us to  continue  to  deliver  our brand of
banking and financial  services to our customers and communities in the years to
come."
         Thomas Thorn,  acting  president and chief  executive  officer for BSB,
stated,  "This is an  exciting  partnership  for our two  companies  that better
positions us to remain an  independent,  community-based  organization.  We will
have the  opportunity  to  continue  offering  our  customers  the high  quality
products and services  they expect  while  reaching an extended  market area and
delivering new financial services to meet the expanding needs of the customer."
         The companies  have scheduled an investor  teleconference  on April 20,
2000  at  2:00  PM  Eastern  Standard  Time.   Details  on  how  to  access  the
teleconference   can  be  obtained   by   contacting   Rebecca   Powell  at  NBT
(607-337-6516) or Stephanie Garrison at BSB (607-779-3522).
         The principal office of NBT is located in Norwich, NY. NBT is listed on
the NASDAQ under the symbol NBTB. Its principal  banking  subsidiary,  NBT Bank,
N.A.  conducts business from 36 offices in nine counties in central and northern
New York.
         The principal office of BSB is located in Binghamton, NY. BSB is listed
on the NASDAQ under the symbol BSBN. Its banking  subsidiary,  BSB Bank & Trust,
operates 22 offices in six counties in central New York and the Southern Tier.
    Forward-Looking Information
    This news release contains statements regarding the projected performance of
NBT Bancorp and BSB Bancorp on a stand-alone and proforma 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: the timing of closing the proposed
merger  being  delayed;   competitive  pressures  among  financial  institutions
increasing significantly;  economic conditions,  either nationally or locally in
areas which NBT and BSB conduct  their  operations,  being less  favorable  than
expected;  expected  cost  savings  from the  proposed  merger  not being  fully
realized  or  realized  within the  expected  time  frame;  and  legislation  or
regulatory changes which adversely affect the ability of the combined company to
conduct its current or future operations. NBT and BSB disclaim 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  document  does not  constitute  an offer of any  securities  for sale.
Before  making any decision  with respect to the  proposed  merger,  NBT and BSB
stockholders will be provided with a joint proxy statement/prospectus which will
be included in the  registration  statement to be filed with the  Securities and
Exchange  Commission by NBT. All such stockholders should read that registration
statement, including the proxy statement before making any investment decision.