NBT BANCORP INC
424B3, 2000-07-06
NATIONAL COMMERCIAL BANKS
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PROSPECTUS


                                 420,989 SHARES
                     COMMON STOCK ($.01 PAR VALUE PER SHARE)
                                NBT BANCORP INC.


         This prospectus relates to the offering by a selling stockholder, David
T. Griffith,  for resale of 420,989  shares of common stock,  $.01 par value per
share of NBT Bancorp  Inc., a Delaware  corporation.  This offering is not being
underwritten.  Mr.  Griffith will receive the entire proceeds of any sales he is
able to make of the shares,  except for brokerage commissions and other costs he
must incur in connection with his sales. We will receive no part of the proceeds
of any sales made by Mr. Griffith.  We have not previously registered any of Mr.
Griffith's  shares of our common  stock prior to the filing of the  Registration
Statement of which this prospectus is a part.


         Our common  stock is quoted on the  Nasdaq  National  Market  under the
symbol "NBTB." On July 5, 2000, the last reported sale price of our common stock
was $10.25 per share.

         Mr.  Griffith  may offer the shares for sale from time to time  through
broker-dealers on the Nasdaq National Market, or otherwise, at such prices as he
is  able to  obtain  at the  time of each  sale.  Mr.  Griffith  and any  broker
executing  selling orders on his behalf may be deemed to be underwriters  within
the  meaning  of  the  Securities  Act  of  1933,  as  amended.   See  "Plan  of
Distribution."

         We encourage you to read this  prospectus  carefully.  This  prospectus
incorporates  important business and financial  information about us that is not
included  in or  delivered  with this  document.  See  "Where  You Can Find More
Information" on page 2.


                  NEITHER  THE SEC  NOR  ANY  STATE  SECURITIES  COMMISSION  HAS
APPROVED OR DISAPPROVED OF THE NBT SHARES TO BE ISSUED UNDER THIS  PROSPECTUS OR
PASSED UPON THE ADEQUACY OR ACCURACY OF THIS PROSPECTUS.  ANY  REPRESENTATION TO
THE CONTRARY IS A CRIMINAL OFFENSE.

         THE  SHARES OF NBT COMMON  STOCK  OFFERED  BY THIS  PROSPECTUS  ARE NOT
SAVINGS  ACCOUNTS,  DEPOSITS  OR  OTHER  OBLIGATIONS  OF ANY  BANK  OR  NON-BANK
SUBSIDIARY OF ANY OF THE PARTIES. THE FDIC OR ANY OTHER GOVERNMENTAL AGENCY DOES
NOT  INSURE OR  GUARANTEE  ANY LOSS TO YOU OF YOUR  INVESTMENT  VALUE IN THE NBT
COMMON STOCK.


                  The date of this prospectus is July 6, 2000



<PAGE>


         No person has been  authorized to give any  information  or to make any
representations  other than those  contained in or  incorporated by reference in
this prospectus in connection with the offering made by this prospectus, and, if
given or made, such  information or  representations  must not be relied upon as
having been  authorized  by us, the  selling  stockholder  or any other  person.
Neither the delivery of this  prospectus nor any sale made under this prospectus
shall, under any  circumstances,  create an implication that information in this
prospectus is correct as of any time  subsequent to the date of this  prospectus
or that  there  has been no  change  in our  affairs  since the date as of which
information is given in this prospectus.  This prospectus does not constitute an
offer to sell or a  solicitation  of an offer to buy any security other than the
securities  covered by this prospectus,  nor does it constitute an offer to or a
solicitation  of  any  person  in  any  jurisdiction  in  which  such  offer  or
solicitation may not be lawfully made.


                                TABLE OF CONTENTS

Where You Can Find More Information ......................................  2

NBT Bancorp Inc. SEC Filings  (SEC File No. 0-14703) .....................  3

NBT Bancorp Inc ..........................................................  3

Use of Proceeds ..........................................................  5

Price Range of Common Stock and Dividends ................................  5

Selling Stockholder ......................................................  6

Plan of Distribution .....................................................  6

Description of NBT Capital Stock .........................................  7

Legal Matters ............................................................  8

Experts ..................................................................  8

Cautionary Statement Regarding Forward-Looking Statements ................  9

Unaudited Pro Forma Condensed Combined Financial Statements .............. 10

Notes to Unaudited Pro Forma Condensed Combined Financial Statements ..... 17


WHERE YOU CAN FIND MORE INFORMATION

         We file annual,  quarterly and special  reports,  proxy  statements and
other information with the SEC. You may read and copy any reports, statements or
other  information  we file at the  SEC's  public  reference  room at 450  Fifth
Street, N.W., Washington,  D.C. 20549. Please call the SEC at 1-800-SEC-0330 for
further  information  on the public  reference  rooms.  Our SEC filings are also
available to the public from commercial  document  retrieval services and at the
web site  maintained by the SEC at  {http://www.sec.gov}.  In addition,  you may
read and copy our SEC  filings at the  Nasdaq  National  Market,  1735 K Street,
N.W., Washington, D.C. 20006-1500. Our Internet address is
{www.nbtbank.com}.

         We have filed a registration statement on Form S-3 to register with the
SEC our common  stock being  offered and sold by the  selling  stockholder,  Mr.
Griffith.  This prospectus is a part of that registration  statement. As allowed

                                       2

<PAGE>

by SEC rules,  this prospectus does not contain all the information you can find
in the registration statement or the exhibits to the registration statement.

         The SEC allows us to "incorporate by reference"  information  into this
prospectus,  which means that we can disclose  important  information  to you by
referring you to another document filed separately with the SEC. The information
incorporated  by reference is deemed to be part of this  prospectus,  except for
any information  superseded by information in this  prospectus.  These documents
contain  important  information  about our company,  our finances and our common
stock.

NBT BANCORP INC. SEC FILINGS  (SEC FILE NO. 0-14703)

         We incorporate  by reference the documents  listed below and any future
filings that we make with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d)
of the  Securities  Exchange Act of 1934,  as amended,  between the date of this
prospectus and the termination date of this offering.

         o        Annual  Report on Form 10-K for the year  ended  December  31,
                  1999;

         o        Quarterly  Report on Form 10-Q for the quarter ended March 31,
                  2000;

         o        Current  Reports on Form 8-K,  filed with the SEC on  February
                  22, 2000,  March 3, 2000,  March 31, 2000, and April 28, 2000;
                  and

         o        Our SEC Rule  424(b)  final  prospectus,  dated April 3, 2000,
                  with  respect to the  section  captioned  "Description  of NBT
                  Capital Stock."

         On March 31, 2000, we filed a Current  Report on Form 8-K with the SEC.
The report contains our  supplemental  consolidated  financial  statements as of
December  31,  1999 and 1998 and for each of the years in the three year  period
ended December 31, 1999,  which have been restated to include the effects of the
Lake  Ariel  Bancorp,  Inc.  merger,  which was  accounted  for as a pooling  of
interests.

         We will provide to each person, including any beneficial owner, to whom
a prospectus is delivered, a copy of any or all of the information that has been
incorporated  by  reference  in  the  prospectus  but  not  delivered  with  the
prospectus.  We will provide this information upon written or oral request at no
cost to the requester.  You may obtain  documents  incorporated  by reference in
this  prospectus  by requesting  them in writing or by telephone  from us at the
following address:

         NBT Bancorp Inc.
         52 South Broad Street
         Norwich, New York 13815
         Attention: Michael J. Chewens, CPA
         Tel: (607) 337-6520

         YOU SHOULD RELY ONLY ON THE  INFORMATION  CONTAINED OR  INCORPORATED BY
REFERENCE IN THIS  PROSPECTUS  IN MAKING YOUR  DECISION TO INVEST IN OUR COMPANY
AND STOCK. WE HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH INFORMATION THAT IS
DIFFERENT FROM WHAT IS CONTAINED IN THIS PROSPECTUS.  YOU SHOULD NOT ASSUME THAT
THE  INFORMATION  CONTAINED IN THIS  PROSPECTUS IS ACCURATE AS OF ANY DATE OTHER
THAN SUCH DATE, AND THE USE OF THIS PROSPECTUS  SHALL NOT CREATE ANY IMPLICATION
TO THE CONTRARY.

NBT BANCORP INC.

         We are a registered bank holding  company  incorporated in the State of
Delaware and the parent  holding  company of NBT Bank,  N.A. and LA Bank,  N.A.,
each a national  bank.  NBT Bank is a full service  commercial  bank providing a
broad range of financial products and services in central and northern New York.
On February 17, 2000,

                                       3

<PAGE>

we completed our  acquisition  of Lake Ariel  Bancorp,  Inc., the parent holding
company  of LA  Bank.  Upon  completion  of  the  merger,  LA  Bank  became  our
wholly-owned  subsidiary.  LA Bank  provides  commercial  banking  products  and
services in  northeastern  Pennsylvania.  The  following  financial  information
reflects  our merger  with Lake Ariel on a pooled  basis.  In fiscal  year ended
December 31, 1999,  our net income was $22.2  million.  As of December 31, 1999,
our  total  assets  were  approximately   $2.0  billion,   total  deposits  were
approximately  $1.5 billion and stockholders'  equity was  approximately  $159.9
million.

         On December 7, 1999, we entered into an agreement with Pioneer American
Holding  Company Corp., a registered  bank holding  company  incorporated in the
Commonwealth of Pennsylvania.  Pioneer American is the parent holding company of
Pioneer American Bank, National  Association,  a national bank. Pioneer American
Bank  provides   commercial   banking  products  and  services  in  northeastern
Pennsylvania.  In fiscal  year  1999,  Pioneer  American's  net  income was $4.1
million.  As  of  December  31,  1999,  Pioneer  American's  total  assets  were
approximately  $418.8 million,  total deposits were approximately $299.5 million
and stockholders'  equity was approximately  $31.6 million.  The stockholders of
NBT and  Pioneer  American  will  vote  upon  the  merger  at  their  respective
stockholders'  meetings on June 20, 2000. We will account for the acquisition of
Pioneer American as a pooling of interests.

         On April 20, 2000,  we and BSB Bancorp,  Inc., a Delaware  corporation,
announced  that we would  merge.  Following  our merger with BSB, we will be the
surviving  corporation.  We and BSB will  choose  a new  name for the  surviving
corporation  before our merger with BSB occurs.  The surviving  corporation will
have assets of approximately $4.7 billion.  The surviving  corporation will have
three direct operating  subsidiaries including two community banks (the combined
NBT and BSB banks and the combined Lake Ariel and Pioneer  American banks) and a
financial services company,  NBT Financial  Services,  Inc.  Stockholders of BSB
will  receive two shares of our common stock for each share  exchanged.  We will
issue  approximately  20.5  million  shares of our  common  stock to the  former
stockholders of BSB upon completion of the merger.  Based on the April 19, 2000,
closing price of our common stock on the Nasdaq National Market, the transaction
was valued at $251 million or $24.00 per share for the outstanding  common stock
of BSB. The merger with BSB,  which our board of directors  and that of BSB have
unanimously approved, is subject to approval by each company's  stockholders and
by banking regulators. We anticipate the merger will close in the fourth quarter
of  2000.   We  intend  the  merger   with  BSB  to  be   accounted   for  as  a
pooling-of-interests and to qualify as a tax-free exchange for BSB stockholders.

         Simultaneous  with our merger with BSB, our and BSB's principal banking
subsidiaries,  NBT Bank and BSB Bank & Trust Company,  will merge, with NBT Bank
being the surviving  bank in the bank merger.  The surviving bank will be one of
the largest independent  community banks in upstate New York. The surviving bank
will serve 12 counties  from more than 55 offices and over 100 ATMs.  A new name
will be chosen for the surviving bank prior to our merger with BSB.

         The surviving  corporation will have a 15-seat board of directors which
will be made up of seven  directors  designated  by BSB from the  members of its
board of directors  and six  directors  designated by us from the members of our
board, plus one designated by us from the former Lake Ariel Bancorp, Inc., which
we acquired in February 2000, and who is serving on our Board and one designated
by us from Pioneer American who is serving on our Board,  subject to the closing
of our merger  with  Pioneer  American.  If we do not  complete  our merger with
Pioneer  American before the effective time of the merger with BSB, the board of
directors of the surviving corporation will consist of 13 directors, six of whom
will be designated by BSB, six by us, and one former Lake Ariel board member who
is serving on our Board.  This former Lake Ariel board member will be designated
by us. Upon completion of our merger with BSB, our common stockholders will have
ownership of approximately 53 percent of the surviving  corporation  while BSB's
common stockholders will own approximately 47 percent,  assuming consummation of
our merger with Pioneer American.

         Daryl R.  Forsythe,  our president and chief  executive  officer,  will
become the  chairman,  president  and chief  executive  officer of the surviving
corporation  and  William  C.  Craine,  chairman  of BSB,  will  become the vice
chairman of the surviving  corporation and chairman of its executive  committee.
Our Bank's  president and chief  operating  officer,  Martin A.  Dietrich,  will
become the president and chief operating officer of the surviving bank.  Michael
J.

                                       4

<PAGE>

Chewens, our executive vice president and chief financial officer, will serve as
chief  financial  officer for the  surviving  corporation.  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 surviving  corporation will be located in
Binghamton,  New York.  Other major bank  functions  will be conducted  from the
surviving corporation's Norwich, Binghamton and Scranton locations following the
merger with BSB.

         The  address  of our  principal  executive  offices  is 52 South  Broad
Street, Norwich, New York 13815, and our telephone number is (607) 337-2265.

USE OF PROCEEDS

         We will not receive any of the proceeds  from the sale of the shares by
Mr.  Griffith.  We  will  pay all  expenses  incurred  in  connection  with  the
registration of the shares.  Mr. Griffith will receive all net proceeds from the
sale of the  common  stock  under this  prospectus.  Mr.  Griffith  will pay all
transaction costs associated with effecting any sales of the shares that occur.

PRICE RANGE OF COMMON STOCK AND DIVIDENDS

         Our common stock trades on the Nasdaq  National Market under the symbol
"NBTB." The following  table sets forth for the periods  indicated (1) the range
of high and low sales  prices  of our  common  stock and (2) the  amount of cash
dividends per share declared by us.



<TABLE>
<CAPTION>
                                                   SALES PRICES
                                                   ------------
                                                 HIGH        LOW       DIVIDENDS
                                                 ----        ---       ---------
<S>                                               <C>        <C>           <C>
1998
           First Quarter                          $19.05     $15.99        $ 0.117
           Second Quarter                          23.48      18.37          0.154
           Third Quarter                           23.81      17.58          0.154
           Fourth Quarter                          24.29      19.72          0.162
1999
           First Quarter                          $23.33     $19.89        $ 0.162
           Second Quarter                          21.19      19.05          0.162
           Third Quarter                           20.90      16.43          0.162
           Fourth Quarter                          17.98      14.63          0.170
2000
           First Quarter                          $16.50     $11.38         $0.170
           Second Quarter                          14.50       9.38          0.170
</TABLE>


                  The timing and amount of future  dividends  we declare and pay
will depend upon our earnings,  cash requirements,  and financial  condition and
those of our subsidiaries and, following our merger with BSB, the earnings, cash
requirements,  and financial condition of the surviving corporation,  applicable
government  regulations,  and  other  factors  deemed  relevant  by the board of
directors of the surviving corporation. Various federal and state laws limit the
ability of affiliated banks to pay dividends to us.

         As of May 31, 2000, we had 4,814 holders of record of our common stock.

                                       5

<PAGE>

SELLING STOCKHOLDER

         The selling stockholder,  David T. Griffith, offers for resale by means
of this  prospectus  some or all of the shares that he  acquired  from us in May
2000 upon our  acquisition of M. Griffith,  Inc., a New York  corporation.  As a
result of the acquisition, M. Griffith, Inc. became a wholly-owned subsidiary of
NBT Financial Services, Inc., our wholly-owned subsidiary.  Mr. Griffith was the
sole stockholder of M. Griffith, Inc. In exchange for his shares of M. Griffith,
Inc.,  we issued to Mr.  Griffith and Hoover and Company as escrow agent a total
of 420,989  shares of our common  stock,  which we refer to in this and the next
section as the "subject  shares." The subject  shares  constitute  approximately
2.3% of our issued and outstanding shares as of the date of this prospectus.  We
have  deposited a portion of the subject  shares into an escrow  account for the
benefit of us and Mr. Griffith with Herkimer County Trust Company, Herkimer, New
York, subject to an escrow agreement among us, NBT Financial Services, Inc., Mr.
Griffith  and  Herkimer  County  Trust  Company,  dated  as of May 5,  2000.  In
accordance with the terms of the escrow agreement,  the escrow agent may release
from escrow a portion of the escrowed  shares to Mr.  Griffith  over the term of
the  escrow  agreement  only upon  fulfillment  of  certain  express  employment
conditions by Mr. Griffith. If and when such escrowed shares are released to Mr.
Griffith from escrow,  Mr.  Griffith may sell any or all of such former escrowed
shares.  We will maintain the registered  status of the escrowed shares with the
SEC,  thereby  permitting  Mr.  Griffith to sell any of the subject  shares upon
their  release from escrow.  We will receive no portion of any proceeds from any
sale of any of the subject shares by Mr. Griffith.

         Prior to our  acquisition  of M. Griffith,  Inc.,  Mr.  Griffith had no
relationship  or  affiliation  with us or any of our  affiliates.  Following the
acquisition, Mr. Griffith entered into a three-year employment agreement with us
as president of our subsidiary, M. Griffith, Inc.

         We are registering  Mr.  Griffith's  shares to permit public  secondary
trading of the subject shares by Mr. Griffith and to allow Mr. Griffith to offer
the subject  shares for resale at such times as he  chooses.  We cannot give any
estimate as to the number of shares that Mr. Griffith will hold after completion
of this  offering  because  he may offer some or all of the  subject  shares and
because there currently are no agreements,  arrangements or understandings  with
respect to the sale of any of the subject  shares.  Mr.  Griffith may offer from
time to time the subject shares held directly by him and those currently held in
escrow but released from escrow to Mr. Griffith in the future.

PLAN OF DISTRIBUTION

         We are  registering  all of the  420,989  subject  shares of our common
stock on behalf of Mr.  Griffith.  We issued the subject shares to Mr.  Griffith
and to the escrow agent in connection with our acquisition of M. Griffith,  Inc.
under an exemption from the  registration  requirements of the Securities Act of
1933, provided by Section 4(2) of that statute. We are registering the shares in
accordance  with the provisions of our  acquisition  agreement with M. Griffith,
Inc.  Depending on market  conditions and other factors,  Mr.  Griffith may sell
some or all of the subject shares offered by this  prospectus from time to time,
in one or more  transactions,  on the Nasdaq National Market,  or otherwise,  at
market prices prevailing at the time of sale, at negotiated  prices, or at fixed
prices,  which may be changed.  Mr. Griffith may effect such sales directly,  or
through  agents,  or through  dealers.  Mr. Griffith may sell some or all of the
subject shares in ordinary broker's transactions or through privately negotiated
transactions  or  through a  combination  of any of these  methods  of sale.  In
connection  with  his  sales,  Mr.  Griffith  may pay  usual  and  customary  or
specifically  negotiated  brokerage fees or  commissions.  Mr. Griffith will act
independently from us in making decisions with respect to the timing, manner and
size of each sale.

         The  aggregate  proceeds to Mr.  Griffith  from the sale of the subject
shares will be the purchase  price of the common  stock sold less the  aggregate
agents' commissions, if any, and other expenses of issuance and distribution not
borne by us. Mr.  Griffith  and any  dealers or agents that  participate  in the
distribution of the subject shares may be deemed to be "underwriters" within the
meaning of the  Securities Act of 1933. Any profit on the sale of the shares and
any  commissions  received by any such dealer or agent in effecting sales of Mr.
Griffith's  shares may be deemed to be  underwriting  discounts and  commissions
under the Securities Act. There is no underwriter or coordinating  broker acting
in connection with the proposed sale of the subject shares by Mr. Griffith.

                                       6

<PAGE>

         Mr.  Griffith will sell the subject  shares only through  registered or
licensed  brokers or dealers if required under applicable state securities laws.
Because Mr.  Griffith may be deemed to be an  underwriter  within the meaning of
Section  2(11) under the  Securities  Act, he will be subject to the  prospectus
delivery  requirements  of the  Securities  Act.  We will  make  copies  of this
prospectus  available  to Mr.  Griffith  and have  informed  him of the need for
delivery of copies of this  prospectus  to purchasers at or prior to the time of
any sale of the subject shares.

         We will  bear  all  costs  and  expenses,  including  registration  and
accounting  fees and the fees,  disbursements  and expenses of our  counsel,  in
connection with the registration of the subject shares under the Securities Act.
Mr.  Griffith will bear all  commissions  and  discounts,  if any,  payable with
respect to sales of the subject  shares.  Mr.  Griffith will pay any transaction
costs  associated with effecting any sales that occur. Mr. Griffith may agree to
indemnify any broker-dealer or agent that participates in transactions involving
sales of the subject shares against certain liabilities,  including  liabilities
arising under the Securities Act.

DESCRIPTION OF NBT CAPITAL STOCK

AUTHORIZED  CAPITAL STOCK.  Our current  authorized stock consists of 30,000,000
shares  of common  stock,  $.01 par value per  share,  and  2,500,000  shares of
preferred stock,  $.01 par value per share. No shares of the preferred stock are
outstanding.  Our Board is  authorized  to issue,  without  further  stockholder
approval,  preferred  stock  from  time to time  in one or more  series,  and to
determine  the  provisions  applicable  to each series,  including the number of
shares, dividend rights, dividend rate, conversion rights, voting rights, rights
and terms of redemption,  sinking fund  provisions,  redemption price or prices,
and liquidation preferences. As of May 31, 2000, 18,522,291 shares of our common
stock were  outstanding.  Additionally,  upon  completion  of our  mergers  with
Pioneer American and BSB, we anticipate issuing approximately 5.2 million shares
and 20.5  million  shares,  respectively,  to the former  stockholders  of those
corporations.  Prior to  completion  of our merger with BSB, we will request our
stockholders to amend our Certificate of Incorporation to increase the number of
our authorized  shares of common stock so that we will have a sufficient  number
of authorized shares to issue in our merger with BSB.

COMMON STOCK.  Under  Delaware law,  stockholders  generally are not  personally
liable for a corporation's acts or debts.  Subject to the preferential rights of
any other  shares or series of  capital  stock,  holders of shares of our common
stock are  entitled to receive  dividends  on shares of common  stock if, as and
when  authorized  and declared by our Board out of funds  legally  available for
dividends and to share ratably in our assets legally  available for distribution
to our stockholders in the event of our  liquidation,  dissolution or winding-up
after  payment  of,  or  adequate  provision  for,  all of our  known  debts and
liabilities.

         Each  outstanding  share of our common stock entitles the holder to one
vote on all matters submitted to a vote of stockholders,  including the election
of  directors.  Unless a larger  vote is  required by law,  our  certificate  of
incorporation  or  our  bylaws,  when  a  quorum  is  present  at a  meeting  of
stockholders, a majority of the votes properly cast upon any question other than
the election of directors  shall decide the  question.  A plurality of the votes
properly  cast for the  election of a person to serve as a director  shall elect
such  person.  Except as  otherwise  required by law or except as provided  with
respect to any other class or series of capital stock, the holders of our common
stock possess the exclusive voting power.  There is no cumulative  voting in the
election of directors.  Our Board is classified into three  categories with each
category equal in number. This means, in general,  that one-third of the members
of our Board are subject to reelection at each annual meeting of stockholders.

         Holders  of our  common  stock  have  no  conversion,  sinking  fund or
redemption  rights,  or preemptive rights to subscribe for any of our classes of
stock.

         All shares of our  common  stock  have  equal  dividend,  distribution,
liquidation  and other  rights,  and have no  preference,  appraisal or exchange
rights.

PREFERRED STOCK. Our Board is authorized,  without any further vote or action by
our  stockholders,  to issue shares of preferred stock in one or more series, to
establish  the  number  of  shares in each  series  and to fix the  designation,

                                       7

<PAGE>

powers,  preferences  and  rights of each such  series  and the  qualifications,
limitations  or  restrictions  of the  series,  in each  case,  if  any,  as are
permitted  by Delaware  law.  Because our Board has the power to  establish  the
preferences and rights of each class or series of preferred stock, it may afford
the stockholders of any series or class of preferred stock  preferences,  powers
and rights,  voting or  otherwise,  senior to the rights of holders of shares of
our common  stock.  The  issuance  of shares of  preferred  stock could have the
effect  of  delaying,  deferring  or  preventing  a  change  in  control  of our
corporation.

STOCKHOLDER  RIGHTS PLAN. In November 1994, we adopted a stockholder rights plan
designed  to  ensure  that  any  potential  acquiror  of our  corporation  would
negotiate  with our  Board  and that all of our  stockholders  would be  treated
equitably in the event of a takeover  attempt.  At that time, we paid a dividend
of one Preferred Share Purchase Right for each  outstanding  share of our common
stock.  Similar  rights are  attached to each share of our common  stock  issued
after  November  15,  1994.  Under  the  rights  plan,  the  rights  will not be
exercisable until a person or group acquires beneficial  ownership of 20 percent
or more of our outstanding  common stock,  begins a tender or exchange offer for
25 percent or more of our common stock, or an adverse person, as declared by our
Board, acquires 10 percent or more of our common stock. Additionally,  until the
occurrence of such an event,  the rights are not severable from our common stock
and  therefore,  the rights  will  transfer  upon the  transfer of shares of our
common stock. Upon the occurrence of such events, each right entitles the holder
to purchase one  one-hundredth of a share of our Series R Preferred Stock,  $.01
par value per share, at a price of $100. The rights plan also provides that upon
the  occurrence  of  certain  specified  events the  holders  of rights  will be
entitled  to  acquire  additional  equity  interests  in us or in the  acquiring
entity,  such interests  having a market value of two times the right's exercise
price of $100. The rights expire November 14, 2004, and are redeemable in whole,
but not in part, at our option prior to the time they become exercisable,  for a
price of $.01 per right.  The rights have  certain  anti-takeover  effects.  The
rights may cause  substantial  dilution  to a person or group that  attempts  to
acquire us on terms not approved by our Board.  The rights  should not interfere
with any merger or other business combination approved by our Board.

REGISTRAR AND TRANSFER AGENT. Our registrar and transfer agent is American Stock
Transfer and Trust Company, New York, New York.

LEGAL MATTERS

         The validity of the shares of our common stock offered  hereby has been
passed upon by Duane, Morris & Heckscher LLP, Washington, D.C.

EXPERTS

         The consolidated financial statements and the supplemental consolidated
financial statements of NBT as of December 31, 1999 and 1998 and for each of the
years in the three-year period ended December 31, 1999 have been incorporated by
reference in this  prospectus  and  registration  statement in reliance upon the
reports  of KPMG  LLP,  independent  certified  public  accountants,  which  are
incorporated herein by reference, and upon the authority of said firm as experts
in accounting and auditing.

         The  consolidated  financial  statements  of  Pioneer  American  as  of
December  31, 1999 and 1998 and for each of the years in the  three-year  period
ended December 31, 1999, have been  incorporated by reference in this prospectus
and registration  statement in reliance upon the report of KPMG LLP, independent
certified public  accountants,  which is incorporated  herein by reference,  and
upon the authority of said firm as experts in accounting and auditing.

         The  consolidated  financial  statements  of BSB  Bancorp,  Inc.  as of
December  31, 1999 and 1998 and for each of the years in the  three-year  period
ended December 31, 1999 have been  incorporated  by reference in this prospectus
and registration statement in reliance upon the report of PricewaterhouseCoopers
LLP,  independent  certified public accountants,  given on the authority of said
firm as experts in accounting and auditing.

                                       8

<PAGE>

            CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

         We have used and incorporated by reference "forward-looking statements"
in this  prospectus.  Words  such  as  "will,"  "will  permit,"  "will  afford,"
"believes,"   "expects,"  "may,"  "should,"   "projected,"   "contemplates,"  or
"anticipates" may constitute  forward-looking  statements.  These statements are
within the meaning of Section 27A of the  Securities Act of 1933 and Section 21E
of  the  Securities   Exchange  Act  of  1934  and  are  subject  to  risks  and
uncertainties that could cause our actual results to differ materially.  We have
used these  statements  to describe our  expectations  and  estimates in various
sections of this prospectus, including:

         o        NBT Bancorp Inc.;

         o        Selling Stockholder;

         o        Plan of Distribution; and

         o        Description of NBT Capital Stock.

   Factors that might cause such  differences  include,  but are not limited to:
the  timing of  closing  of our  proposed  mergers  being  delayed;  competitive
pressures  among  financial  institutions  increasing  significantly;   economic
conditions,  either  nationally  or  locally  in  areas  in  which  we  and  our
prospective  merger  partners  conduct  our  respective  operations,  being less
favorable than expected;  the cost and effort  required to integrate  aspects of
the  operations of the companies we will acquire  being more  difficult  than we
expected;  our expected  cost savings from our proposed  mergers not being fully
realized or realized  within the expected time frame;  legislation or regulatory
changes which adversely affect the ability of our company following our proposed
acquisitions to conduct its current and future operations; and the impact of the
transition to the year 2000 on the operations of us or our merger  partners.  We
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 in
this  prospectus to reflect  future events or  developments.  Our actual results
could differ materially from those set forth in the  forward-looking  statements
because of many reasons, including the risk factors we list above. This list may
not be exhaustive.

                                       9

<PAGE>


           UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

The following  unaudited pro forma condensed combined balance sheet presents the
financial  position of NBT Bancorp Inc.  (NBT),  BSB Bancorp,  Inc.  (BSB),  and
Pioneer American Holding Company Corp.  (Pioneer  American) as of March 31, 2000
assuming that both mergers had occurred as of March 31, 2000 after giving effect
to certain  pro forma  adjustments  described  in the  accompanying  notes.  The
following  unaudited pro forma condensed  combined  statements of income for the
three  months  ended March 31, 2000 and 1999,  and the years ended  December 31,
1999,  1998, and 1997 present the combined  historical  results of operations of
NBT,  BSB, and Pioneer  American as if the mergers had been  completed as of the
first day of the period presented.  The historical financial  information of NBT
has been  restated to include the effects of the merger with Lake Ariel  Bancop,
Inc.  (Lake  Ariel),  which was  completed  on  February  17,  2000 and has been
accounted for as a pooling of interests.  Pro forma earnings per share are based
on the  exchange  ratios  of 2.0 and  1.805  for the  BSB and  Pioneer  American
mergers,  respectively.  The fiscal years of NBT, BSB, and Pioneer  American end
December 31. The unaudited pro forma condensed  combined  balance sheet reflects
estimated  non-recurring  charges  that may be incurred in  connection  with the
mergers.

The unaudited pro forma condensed  combined  financial  statements were prepared
giving  effect to the mergers on the  pooling of  interests  accounting  method.
Under this method of accounting, the recorded assets, liabilities, stockholders'
equity,  income and expense of NBT,  BSB, and Pioneer  American are combined and
reflected  at their  historical  amounts,  except  as noted in the  accompanying
notes.

The combined  company  expects to achieve certain merger benefits in the form of
operating expense reductions and revenue  enhancements.  The unaudited pro forma
condensed  combined  statements  of income do not  reflect  potential  operating
expense reductions or revenue  enhancements that are expected to result from the
mergers,  and  therefore  may  not  be  indicative  of  the  results  of  future
operations.  No assurance  can be given with  respect to the  ultimate  level of
operating expense reductions or revenue enhancements.

The unaudited pro forma condensed combined  financial  statements should be read
in  conjunction  with,  and are qualified in their  entirety by, the  historical
consolidated  financial  statements  and  accompanying  notes of NBT,  BSB,  and
Pioneer  American and the  supplemental  consolidated  financial  statements and
accompanying  notes of NBT,  which have been  restated to include the effects of
the Lake Ariel merger. These supplemental  financial statements were included in
Current Report on Form 8-K, dated March 31, 2000 and  incorporated  by reference
herein. The following historical  financial  information of Pioneer American and
BSB has  been  derived  from  the  respective  companies'  interim  consolidated
financial  statements  as of March 31, 2000 and for the three months ended March
31, 2000 and 1999 which are included in the  respective  companies Form 10-Q for
the  three  months  ended  March  31,  2000 and  filed  with the SEC,  and their
respective  consolidated  financial  statements  and  accompanying  notes  as of
December  31,  1999 and 1998 and for each of the years in the three year  period
ended December 31, 1999,  which were included in the respective  companies' Form
10-K for the year ended December 31, 1999. The consolidated financial statements
of BSB and Pioneer American as of December 31, 1999 and 1998 and for each of the
years in the three year  period  ended  December  31, 1999 are  incorporated  by
reference into this  registration  statement.  The unaudited pro forma condensed
combined  financial  statements are presented for  informational  purposes only.
These  statements  are not  necessarily  indicative  of the  combined  financial
position and results of  operations  that would have occurred if the mergers had
been completed on March 31, 2000 or at the beginning of the  respective  periods
presented or that may be attained in the future.

                                       10

<PAGE>

Unaudited Pro Forma Condensed Combined Balance Sheet
March 31, 2000
(in thousands)

<TABLE>
<CAPTION>
                                                                               NBT
                                                                               BSB      Pioneer American
                                      NBT           BSB        Pro Forma     Combined        Holding       Pro Forma     Combined
                                 Bancorp Inc.  Bancorp, Inc.  Adjustments   Pro Forma     Company Corp.   Adjustments   Pro Forma
                                 ------------  -------------  -----------   ---------   ----------------  -----------   ---------
<S>                            <C>            <C>            <C>           <C>          <C>               <C>          <C>
ASSETS

Cash and cash equivalents        $   60,823     $   47,718     $     --    $  108,541       $ 13,216        $    --    $  121,757
Securities available for
  sale, at fair value               497,528        382,703           --       880,231        105,239             --       985,470
Securities held to maturity
  (fair value-NBT Bancorp Inc.
  $75,808, BSB Bancorp, Inc.
  $13,208, and Pioneer
  American Holding Company
  Corp. $34,560)                     78,772         13,079           --        91,851         35,746             --       127,597
Loans                             1,295,651      1,745,959                  3,041,610        245,147                    3,286,757
Less:   Allowance for loan
  losses                             17,543         31,705           --        49,248          3,145             --        52,393
-----------------------------------------------------------------------------------------------------------------------------------
   Net loans                      1,278,108      1,714,254           --     2,992,362        242,002             --     3,234,364
Premises and equipment, net          40,292         15,541           --        55,833          5,910             --        61,743
Other assets                         73,583         57,569        4,500       135,652         13,615           1,300      150,567
-----------------------------------------------------------------------------------------------------------------------------------
TOTAL ASSETS                    $ 2,029,106    $ 2,230,864     $  4,500    $4,264,470      $ 415,728         $ 1,300   $4,681,498
===================================================================================================================================

LIABILITIES AND
  STOCKHOLDERS' EQUITY
Deposits:
 Demand (noninterest bearing)   $   210,579    $   139,639     $    --     $  350,218      $  45,842         $   --       396,060
 Savings,NOW, and money
   market                           490,328        653,091          --      1,143,419        110,880             --     1,254,299
 Time                               822,842      1,106,548          --      1,929,390        143,152             --     2,072,542
-----------------------------------------------------------------------------------------------------------------------------------
 Total deposits                   1,523,749      1,899,278          --      3,423,027        299,874             --     3,722,901
Borrowings                          327,238        135,982          --        463,220         79,489             --       542,709
Other liabilities                    15,587          8,588      16,500         40,675          4,272          5,100        50,047
Mandatorily redeemable
  preferred securities
  of subsidiary                          --         30,000          --         30,000             --             --        30,000
-----------------------------------------------------------------------------------------------------------------------------------
  Total liabilities               1,866,574      2,073,848      16,500      3,956,922        383,635          5,100     4,345,657
-----------------------------------------------------------------------------------------------------------------------------------


Stockholders' equity:
  Preferred stock                        --             --          --             --             --            --             --
  Common stock                          186            114          91            391          2,935        (2,883)           443
  Additional paid-in-capital        167,047         37,590     (13,548)       191,089         11,962         1,153        204,204
  Retained earnings                  24,225        143,481     (12,000)       155,706         22,355        (3,800)       174,261
  Accumulated other
    comprehensive income (loss)     (17,615)       (10,712)         --        (28,327)        (3,429)           --        (31,756)
  Common stock in treasury,
    at cost                         (11,311)       (13,457)     13,457        (11,311)        (1,730)        1,730        (11,311)
-----------------------------------------------------------------------------------------------------------------------------------
  Total stockholders' equity        162,532        157,016     (12,000)       307,548         32,093        (3,800)       335,841
-----------------------------------------------------------------------------------------------------------------------------------
TOTAL LIABILITIES AND
  STOCKHOLDERS' EQUITY          $ 2,029,106    $ 2,230,864     $ 4,500     $4,264,470      $ 415,728       $ 1,300     $4,681,498
===================================================================================================================================
</TABLE>

See  accompanying  notes to unaudited  pro forma  condensed  combined  financial
statements

                                       11

<PAGE>


Unaudited Pro Forma Condensed Combined Statement of Income
For the Three Months Ended March 31, 2000

<TABLE>
<CAPTION>
                                                                                        Pioneer                            NBT
                                                                          NBT          American                            BSB
                                                                          BSB           Holding                          Pioneer
                                  NBT           BSB        Pro Forma     Combined       Company        Pro Forma        Combined
                             Bancorp Inc.   Bancorp, Inc.  Adjustments   Pro Forma        Corp.        Adjustments       Pro Forma
                             ------------   -------------  -----------   ---------    -----------      -----------      ----------
<S>                         <C>            <C>            <C>          <C>           <C>             <C>               <C>
Interest and fee income:
 Loan                          $ 27,189       $ 39,593        $ --    $ 66,782         $ 5,048             $ --         $ 71,830
 Securities                       9,865          6,674          --      16,539           2,358               --           18,897
 Other                              402             13          --         415               4               --              419
--------------------------------------------------------------------------------------------------------------------------------
   Total interest and
    fee income:                  37,456         46,280          --      83,736           7,410               --           91,146
--------------------------------------------------------------------------------------------------------------------------------

Interest expense:
 Deposits                        13,446         21,319          --      34,765           2,637               --           37,402
 Borrowings                       4,400          2,582          --       6,982           1,135               --            8,117
--------------------------------------------------------------------------------------------------------------------------------
  Total interest expense         17,846         23,901          --      41,747           3,772               --           45,519
--------------------------------------------------------------------------------------------------------------------------------
 Net interest income             19,610         22,379          --      41,989           3,638               --           45,627
 Provision for
   loan losses                    1,334          4,608          --       5,942             120               --            6,062
--------------------------------------------------------------------------------------------------------------------------------
 Net interest income
   after provision for
   loan losses                   18,276         17,771          --      36,047           3,518               --           39,565
--------------------------------------------------------------------------------------------------------------------------------

Noninterest income:
 Trust                              860            331          --       1,191              --               --            1,191
 Service charges on
   deposit accounts               1,620          1,213          --       2,833             526               --            3,359
 Net security gains
   (losses)                           -              -          --          --              --               --               --
 Other                            1,135          1,817          --       2,952             195               --            3,147
--------------------------------------------------------------------------------------------------------------------------------
  Total noninterest
    income                        3,615          3,361          --       6,976             721               --            7,697
--------------------------------------------------------------------------------------------------------------------------------


Noninterest expense:
  Salaries and
    employee benefits             7,081          5,899          --      12,980           1,322               --           14,302
  Office supplies
    and postage                     592            393          --         985             119               --            1,104
  Occupancy                       1,232            727          --       1,959             269               --            2,228
  Equipment                       1,137            442          --       1,579             225               --            1,804
  Professional fees
    and outside
    services                        756          1,479          --       2,235             240               --            2,475
  Data processing
    and communications            1,132            416          --       1,548              96               --            1,644
  Amortization of
    intangible assets               312             96          --         408              10               --              418
  Merger and
    acquisition charges           1,122             --          --       1,122              --               --            1,122
  Other operating                 1,619          2,261          --       3,880             494               --            4,374
--------------------------------------------------------------------------------------------------------------------------------
   Total noninterest
     expense                     14,983         11,713          --      26,696           2,775               --           29,471
--------------------------------------------------------------------------------------------------------------------------------
 Income before income
     taxes                        6,908          9,419          --      16,327           1,464               --           17,791
 Income taxes                     2,667          3,671          --       6,338             425               --            6,763
--------------------------------------------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------------------------------------------
   Net Income                   $ 4,241        $ 5,748        $ --    $  9,989         $ 1,039             $ --         $ 11,028
================================================================================================================================

Weighted Average
 Shares Outstanding

  Basic                          18,028         10,243                 38,514           2,864                            43,684
  Diluted                        18,134         10,337                 38,808           2,887                            44,019

Earnings Per Share

  Basic                            0.24           0.56                   0.26            0.36                              0.25
  Diluted                          0.23           0.56                   0.26            0.36                              0.25
</TABLE>


See  accompanying  notes to unaudited  pro forma  condensed  combined  financial
statements

                                       12

<PAGE>


Unaudited Pro Forma Condensed Combined Statement of Income
For the Three Months Ended March 31, 1999

<TABLE>
<CAPTION>
                                                                                           Pioneer                         NBT
                                                                             NBT          American                         BSB
                                                                             BSB           Holding                       Pioneer
                                  NBT           BSB          Pro Forma     Combined        Company    Pro Forma         Combined
                              Bancorp Inc.  Bancorp, Inc.    Adjustments   Pro Forma         Corp.    Adjustments        Pro Forma
                              ------------  --------------   ------------  ----------     ---------   ------------      ----------
<S>                          <C>           <C>              <C>           <C>            <C>         <C>                <C>
Interest and fee income:
 Loan                          $ 22,679         $ 35,463          $ --     $ 58,142         $ 4,812       $    --         $ 62,954
 Securities                       8,465            6,838            --       15,303           2,291            --           17,594
 Other                              458              204            --          662              82            --              744
----------------------------------------------------------------------------------------------------------------------------------
   Total interest and
     fee income:                 31,602           42,505            --       74,107           7,185            --           81,292
----------------------------------------------------------------------------------------------------------------------------------

Interest expense:
 Deposits                        11,006           17,927            --       28,933           2,729            --           31,662
 Borrowings                       2,878            3,466            --        6,344             968            --            7,312
----------------------------------------------------------------------------------------------------------------------------------
  Total interest
    expense                      13,884           21,393            --       35,277           3,697            --           38,974
----------------------------------------------------------------------------------------------------------------------------------
 Net interest income             17,718           21,112            --       38,830           3,488            --           42,318
 Provision for
   loan losses                    1,120            3,461            --        4,581              75            --            4,656
----------------------------------------------------------------------------------------------------------------------------------
 Net interest income
   after provision
   for loan losses               16,598           17,651            --       34,249           3,413            --           37,662
----------------------------------------------------------------------------------------------------------------------------------

Noninterest income:
 Trust                              835              251            --        1,086              --            --            1,086
 Service charges on
   deposit accounts               1,408            1,000            --        2,408             517            --            2,925
 Net security gains
   (losses)                         668             (401)           --          267              --            --              267
 Other                            1,365            1,539            --        2,904             126            --            3,030
----------------------------------------------------------------------------------------------------------------------------------
  Total noninterest
    income                        4,276            2,389            --        6,665             643            --            7,308
----------------------------------------------------------------------------------------------------------------------------------


Noninterest expense:
  Salaries and
    employee benefits             5,970            5,081            --       11,051           1,331            --           12,382
  Office supplies
    and postage                     637              433            --        1,070             145            --            1,215
  Occupancy                       1,024              773            --        1,797             285            --            2,082
  Equipment                         947              427            --        1,374             242            --            1,616
  Professional fees
    and outside services            697            1,331            --        2,028             183            --            2,211
  Data processing and
    communications                  972              490            --        1,462             118            --            1,580
  Amortization of
    intangible assets               329               96            --          425              10            --              435
  Other operating                 1,240            2,533            --        3,773             559            --            4,332
----------------------------------------------------------------------------------------------------------------------------------
   Total noninterest
     expense                     11,816           11,164            --       22,980           2,873            --           25,853
----------------------------------------------------------------------------------------------------------------------------------
 Income before
   income taxes                   9,058            8,876            --       17,934           1,183            --           19,117
 Income taxes                     3,282            3,340            --        6,622             300            --            6,922
----------------------------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------------------------
   Net Income                   $ 5,776          $ 5,536          $ --     $ 11,312           $ 883          $ --         $ 12,195
==================================================================================================================================


Weighted Average
  Shares Outstanding

  Basic                          17,860           10,071                    38,002           2,921                        43,274
  Diluted                        18,104           10,341                    38,786           2,947                        44,105

Earnings Per Share

  Basic                            0.32             0.55                      0.30            0.30                          0.28
  Diluted                          0.32             0.54                      0.29            0.30                          0.28
</TABLE>


See  accompanying  notes to unaudited  pro forma  condensed  combined  financial
statements

                                       13

<PAGE>


Unaudited Pro Forma Condensed Combined Statement of Income
For the Year Ended December 31, 1999

<TABLE>
<CAPTION>
                                                                                       Pioneer                           NBT
                                                                               NBT     American                          BSB
                                                                               BSB     Holding                         Pioneer
                                  NBT            BSB         Pro Forma      Combined   Company      Pro Forma         Combined
                             Bancorp Inc.   Bancorp, Inc.   Adjustments    Pro Forma    Corp.      Adjustments        Pro Forma
                             ------------   -------------   -----------    ---------  ----------  ------------       -----------
<S>                         <C>            <C>             <C>             <C>        <C>         <C>                <C>
Interest and fee income:
 Loans                           $ 96,235        $ 151,001      $   --    $ 247,236   $ 19,661       $     --         $ 266,897
 Securities                        38,166           25,038          --       63,204      9,491             --            72,695
 Other                                988              682          --        1,670        237             --             1,907
--------------------------------------------------------------------------------------------------------------------------------
   Total interest
     and fee income:              135,389          176,721          --      312,110     29,389             --           341,499
--------------------------------------------------------------------------------------------------------------------------------

Interest expense:
 Deposits                          46,067           75,542          --      121,609     10,519             --           132,128
 Borrowings                        14,515           14,034          --       28,549      4,379             --            32,928
--------------------------------------------------------------------------------------------------------------------------------
  Total interest
    expense                        60,582           89,576          --      150,158     14,898             --           165,056
--------------------------------------------------------------------------------------------------------------------------------
 Net interest
    income                         74,807           87,145          --      161,952     14,491             --           176,443
 Provision for
    loan losses                     5,070           19,137          --       24,207        370             --            24,577
--------------------------------------------------------------------------------------------------------------------------------
 Net interest income
   after provision
   for loan losses                 69,737           68,008          --      137,745     14,121             --           151,866
--------------------------------------------------------------------------------------------------------------------------------

Noninterest income:
 Trust                              3,305            1,104          --        4,409         --             --             4,409
 Service charges on
   deposit accounts                 6,303            4,382          --       10,685      1,635             --            12,320
 Net security
   gains (losses)                   1,716             (231)         --        1,485         88             --             1,573
 Other                              5,097            7,116          --       12,213      1,108             --            13,321
--------------------------------------------------------------------------------------------------------------------------------
  Total noninterest
    income                         16,421           12,371          --       28,792      2,831             --            31,623
--------------------------------------------------------------------------------------------------------------------------------


Noninterest expense:
  Salaries and
    employee benefits              25,213           20,386          --       45,599      5,291             --            50,890
  Office supplies
    and postage                     2,436            1,684          --        4,120        534             --             4,654
  Occupancy                         4,317            2,874          --        7,191      1,062             --             8,253
  Equipment                         4,230            1,733          --        5,963        990             --             6,953
  Professional fees
    and outside services            3,325            6,001          --        9,326      1,005             --            10,331
  Data processing and
    communications                  4,091            1,930          --        6,021        437             --             6,458
  Amortization of
    intangible assets               1,278              386          --        1,664         39             --             1,703
  Merger and
    acquisition charges               798            5,408          --        6,206         --             --             6,206
  Other operating                   5,812           10,261          --       16,073      2,024             --            18,097
--------------------------------------------------------------------------------------------------------------------------------
   Total noninterest
    expense                        51,500           50,663          --      102,163     11,382             --           113,545
--------------------------------------------------------------------------------------------------------------------------------
 Income before
    income taxes                   34,658           29,716          --       64,374      5,570             --            69,944
 Income taxes                      12,483           11,491          --       23,974      1,488             --            25,462
--------------------------------------------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------------------------------------------
   Net Income                    $ 22,175         $ 18,225      $   --     $ 40,400    $ 4,082       $     --          $ 44,482
================================================================================================================================


Weighted Average
  Shares Outstanding

  Basic                            17,851           10,138                    38,127      2,902                          43,365
  Diluted                          18,095           10,312                    38,719      2,929                          44,006


Earnings Per
  Share

  Basic                              1.24             1.80                      1.06       1.41                            1.03
  Diluted                            1.23             1.77                      1.04       1.39                            1.01
</TABLE>


See  accompanying  notes to unaudited  pro forma  condensed  combined  financial
statements

                                       14

<PAGE>


Unaudited Pro Forma Condensed Combined Statement of Income
For the Year Ended December 31, 1998

<TABLE>
<CAPTION>
                                                                                               Pioneer                      NBT
                                                                                    NBT        American                     BSB
                                                                                    BSB        Holding                    Pioneer
                                      NBT             BSB          Pro Forma      Combined     Company      Pro Forma     Combined
                                 Bancorp Inc.    Bancorp, Inc.    Adjustments    Pro Forma      Corp.      Adjustments   Pro Forma
                                -------------    -------------   ------------   -----------   ----------  -------------  ----------
<S>                            <C>              <C>             <C>            <C>           <C>          <C>            <C>
Interest and fee income:
 Loans                             $ 89,399         $ 139,374        $    --     $ 228,773      $ 19,093     $     --     $ 247,866
 Securities                          40,370            25,926             --        66,296         8,729           --        75,025
 Other                                  531               866             --         1,397           480           --         1,877
-----------------------------------------------------------------------------------------------------------------------------------
   Total interest
     and fee income:                130,300           166,166             --       296,466        28,302           --       324,768
-----------------------------------------------------------------------------------------------------------------------------------

Interest expense:
 Deposits                            48,058            72,387             --       120,445        10,840           --       131,285
 Borrowings                          12,359            12,399             --        24,758         3,479           --        28,237
-----------------------------------------------------------------------------------------------------------------------------------
  Total interest
    expense                          60,417            84,786             --       145,203        14,319           --       159,522
-----------------------------------------------------------------------------------------------------------------------------------
 Net interest
    income                           69,883            81,380             --       151,263        13,983           --       165,246
 Provision for
    loan losses                       5,729            12,931             --       18,660            420           --        19,080
----------------------------------------------------------------------------------------------------------------------------------
 Net interest
   income after
   provision for
   loan losses                       64,154            68,449             --      132,603         13,563           --       146,166
-----------------------------------------------------------------------------------------------------------------------------------

Noninterest income:
 Trust                                3,115               994             --        4,109             --           --         4,109
 Service charges
   on deposit accounts                5,325             3,714             --        9,039          1,404           --        10,443
 Net security
   gains (losses)                     1,056              (851)            --          205            511           --           716
 Other                                5,417             4,738             --       10,155          1,046           --        11,201
-----------------------------------------------------------------------------------------------------------------------------------
  Total noninterest
    income                           14,913             8,595             --       23,508          2,961           --        26,469
-----------------------------------------------------------------------------------------------------------------------------------


Noninterest expense:
  Salaries and
    employee benefits                24,215            19,528             --       43,743          5,071           --        48,814
  Office supplies
    and postage                       2,523             1,998             --        4,521            506           --         5,027
  Occupancy                           4,132             2,911             --        7,043          1,027           --         8,070
  Equipment                           3,599             1,466             --        5,065            773           --         5,838
  Professional fees
    and outside
    services                          3,375             4,086             --        7,461          1,027           --         8,488
  Data processing
    and communications                3,796             2,027             --        5,823            483           --         6,306
  Amortization of
    intangible assets                 1,275               386             --        1,661             39           --         1,700
  Other operating                     7,665             9,581             --       17,246          2,041           --        19,287
-----------------------------------------------------------------------------------------------------------------------------------
   Total noninterest
     expense                         50,580            41,983             --       92,563         10,967           --       103,530
-----------------------------------------------------------------------------------------------------------------------------------
 Income before
   income taxes                      28,487            35,061             --       63,548          5,557           --        69,105
 Income taxes                         5,614            13,542             --       19,156          1,535           --        20,691
-----------------------------------------------------------------------------------------------------------------------------------

-----------------------------------------------------------------------------------------------------------------------------------
   Net Income                      $ 22,873          $ 21,519        $    --     $ 44,392       $  4,022      $    --      $ 48,414
===================================================================================================================================

Weighted Average
  Shares Outstanding

  Basic                              17,976            10,006                     37,988          2,894                      43,212
  Diluted                            18,361            10,365                     39,091          2,953                      44,421

Earnings Per Share

  Basic                                1.27              2.15                       1.17           1.39                        1.12
  Diluted                              1.25              2.08                       1.14           1.36                        1.09
</TABLE>

See  accompanying  notes to unaudited  pro forma  condensed  combined  financial
statements

                                       15

<PAGE>


Unaudited Pro Forma Condensed Combined Statement of Income
For the Year Ended December 31, 1997

<TABLE>
<CAPTION>
                                                                                                                           NBT
                                                                                NBT          Pioneer                       BSB
                                                                                BSB          American                    Pioneer
                                  NBT            BSB          Pro Forma       Combined       Holding      Pro Forma      Combined
                             Bancorp Inc.   Bancorp, Inc.    Adjustments     Pro Forma    Company Corp.  Adjustments    Pro Forma
                             ------------   -------------    -----------    -----------   -------------  ------------  -----------
<S>                          <C>             <C>            <C>           <C>             <C>             <C>          <C>
Interest and
  fee income:
 Loans                         $ 81,688        $ 120,750       $     --      $ 202,438         $ 18,101   $     --      $ 220,539
 Securities                      38,536           20,398             --         58,934            8,086         --         67,020
 Other                              607              200             --            807              320         --          1,127
----------------------------------------------------------------------------------------------------------------------------------
   Total interest
     and fee income:            120,831          141,348             --        262,179           26,507         --        288,686
----------------------------------------------------------------------------------------------------------------------------------

Interest expense:
 Deposits                        45,629           60,180             --        105,809           11,337         --         117,146
 Borrowings                      10,418           11,272             --         21,690            1,508         --          23,198
----------------------------------------------------------------------------------------------------------------------------------
  Total interest
    expense                      56,047           71,452             --        127,499           12,845         --         140,344
----------------------------------------------------------------------------------------------------------------------------------
 Net interest
   income                        64,784           69,896             --        134,680           13,662         --         148,342
 Provision for
   loan losses                    4,285           10,814             --         15,099              535         --          15,634
----------------------------------------------------------------------------------------------------------------------------------
 Net interest
   income after
   provision for
   loan losses                   60,499           59,082             --        119,581           13,127         --         132,708
----------------------------------------------------------------------------------------------------------------------------------

Noninterest income:
 Trust                            2,675              709             --          3,384               --         --           3,384
 Service charges on
   deposit accounts               4,942            3,297             --          8,239            1,397         --           9,636
 Net security
   gains (losses)                  (123)             380             --            257              157         --             414
 Other                            3,973            3,762             --          7,735              907         --           8,642
----------------------------------------------------------------------------------------------------------------------------------
  Total noninterest
    income                       11,467            8,148             --         19,615            2,461         --          22,076
----------------------------------------------------------------------------------------------------------------------------------


Noninterest expense:
  Salaries and
    employee benefits            22,111           17,121             --         39,232            5,040         --          44,272
  Office supplies
    and postage                   2,250            1,886             --          4,136              507         --           4,643
  Occupancy                       3,754            2,547             --          6,301            1,026         --           7,327
  Equipment                       2,632            1,378             --          4,010              685         --           4,695
  Professional fees
    and outside services          2,485            2,716             --          5,201              900         --           6,101
  Data processing
    and communications            2,966            1,358             --          4,324              456         --           4,780
  Amortization of
    intangible assets             1,505              386             --          1,891               39         --           1,930
  Other operating                 6,677            9,548             --         16,225            1,427         --          17,652
----------------------------------------------------------------------------------------------------------------------------------
   Total noninterest
     expense                     44,380           36,940             --         81,320           10,080         --          91,400
----------------------------------------------------------------------------------------------------------------------------------
 Income before
   income taxes                  27,586           30,290             --         57,876            5,508         --          63,384
 Income taxes                     9,406           11,641             --         21,047            1,500         --          22,547
----------------------------------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------------------------------
   Net Income                  $ 18,180         $ 18,649        $    --      $  36,829          $ 4,008    $    --        $ 40,837
==================================================================================================================================

Weighted Average
  Shares Outstanding

  Basic                          17,095            9,905                       36,905            2,850                      42,049
  Diluted                        17,393           10,258                       37,909            2,939                      43,214

Earnings Per Share

  Basic                            1.06             1.88                         1.00             1.41                        0.97
  Diluted                          1.05             1.82                         0.97             1.36                        0.94
</TABLE>

See  accompanying  notes to unaudited  pro forma  condensed  combined  financial
statements

                                       16

<PAGE>


NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

(1)      Pro forma  earnings per share have been  calculated  on the  applicable
         weighted average number of shares of NBT plus the additional  shares of
         NBT assumed to be issued in the mergers in  exchange  for the  weighted
         average  outstanding  shares  of BSB  and  Pioneer  American  for  each
         applicable  period  based  on the  exchange  ratios  of 2.0 and  1.805,
         respectively.

(2)      Pro forma  entry to retire  treasury  stock held by BSB  (approximately
         1,174,216 shares having a par value of $.01 per share):

<TABLE>
<S>                                                                             <C>
        Common Stock ........................................................            11,742
        Paid in Capital .....................................................        13,445,258
            Treasury Stock ..................................................        13,457,000


        BSB common stock issued at March 31, 2000 ...........................        11,430,761
        Less treasury stock retired above ...................................        (1,174,216)
                                                                                     ----------

        BSB common stock issued and outstanding at March 31, 2000...........        10,256,545
                                                                                    ==========
</TABLE>


     Pro forma  entry to issue 2.0 shares of NBT common  stock in  exchange  for
each share of BSB common stock:


<TABLE>
<S>                                                                             <C>
NBT common stock issued at March 31, 2000 ..................................        18,623,435

NBT common stock issued in exchange for BSB common stock after retirement
of BSB's treasury stock (10,256,545 shares of BSB common stock times
conversion ratio of 2.0)....................................................        20,513,090
                                                                                    ----------
Combined NBT/BSB pro forma total shares of common stock issued .............        39,136,525

Par value per share of NBT common stock ....................................              $.01
                                                                                   -----------

Combined NBT/BSB pro forma total par value .................................          $391,365
                                                                                   ===========


Actual par value of common stock at March 31, 2000:

NBT ........................................................................          $186,234
BSB (after retirement of treasury shares) ..................................           102,566
                                                                                   -----------

Total ......................................................................         $288,800
                                                                                   ===========

Required increase in par value .............................................          $102,565
                                                                                   ===========

     Entry to conform par value of common stock:

     Paid in Capital.......................................................            102,565
         Common stock......................................................            102,565

</TABLE>

                                       17

<PAGE>

     Summary of pro forma entries above:

<TABLE>
<S>                                                                             <C>
     Paid in Capital........................................................        13,547,823
         Common Stock.......................................................            90,823
         Treasury Stock.....................................................        13,457,000
</TABLE>


(3)      Pro forma  entry to retire  treasury  stock  held by  Pioneer  American
         (approximately 71,060 shares having a par value of $1.00 per share):

<TABLE>
<S>                                                  <C>
         Common Stock.......................................................           71,060
         Paid in Capital....................................................        1,658,739
             Treasury Stock.................................................        1,729,799

         Pro forma entry to issue 1.805  shares of NBT common  stock in exchange
         for each share of Pioneer  American common stock.  The par value of NBT
         common stock to be issued is determined as follows:

         Combined  NBT/BSB pro forma common stock issued at March 31, 2000 (note
         1).................................................................      39,136,525

         NBT common stock issued in exchange for Pioneer  American  common stock
         after retirement of Pioneer American  treasury stock (2,864,307  shares
         of Pioneer American common stock times conversion ratio of 1.805)..       5,170,074
                                                                                 -----------
         Combined pro forma total shares of common stock issued.............      44,306,599

         Par value per share of common stock................................            $.01
                                                                                 -----------

         Combined pro forma total par value.................................    $     443,066
                                                                                  ===========

         Actual par value of common stock at March 31, 2000:

         NBT/BSB combined pro forma (note 1)................................    $     391,365
         Pioneer American (after retirement of treasury shares).............        2,864,307
                                                                                    ---------

         Total..............................................................    $   3,255,672
                                                                                    ==========

         Required decrease in par value.....................................    $   2,812,606
                                                                                   ==========

         Entry to conform par value of common stock:
         Common stock.......................................................       2,812,606
            Paid in Capital.................................................       2,812,606

         Summary of pro forma entries above:

         Common Stock.......................................................       2,883,666
             Paid in Capital................................................       1,153,867
             Treasury Stock.................................................       1,729,799
</TABLE>

                                       18

<PAGE>

(4)      Authorized,  issued and outstanding  share information is as follows at
         March 31, 2000:

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                      NBT             BSB             NBT/BSB Pro forma   Pioneer American   NBT/BSB/
                                                                                                             Pioneer American Pro
                                                                                                             forma
------------------------------------------------------------------------------------------------------------------------------------
PREFERRED
<S>                                  <C>             <C>                 <C>                <C>                   <C>
------------------------------------------------------------------------------------------------------------------------------------
Authorized                            2,500,000       2,500,000           2,500,000                 --              5,000,000
------------------------------------------------------------------------------------------------------------------------------------
Issued and Outstanding                       --              --                  --                 --                     --
------------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------------
COMMON
------------------------------------------------------------------------------------------------------------------------------------
Par value                                 $0.01           $0.01               $0.01              $1.00                  $0.01
------------------------------------------------------------------------------------------------------------------------------------
Authorized                           30,000,000      30,000,000          30,000,000         30,000,000            100,000,000
------------------------------------------------------------------------------------------------------------------------------------
Issued                               18,623,435      11,430,761          39,136,525          2,935,367             44,306,599
------------------------------------------------------------------------------------------------------------------------------------
Outstanding                          18,100,868      10,256,545          38,613,958          2,864,307             43,784,032
------------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

(5)      The unaudited pro forma condensed  combined  balance sheet at March 31,
         2000, reflects  anticipated  non-recurring merger and integration costs
         for both the Pioneer  American  and BSB mergers.  Costs  related to the
         Pioneer  American  merger  are  estimated  to be in the  range  of $4.6
         million to $5.6 million  ($3.3  million to $4.3 million  after  taxes).
         Costs  related to the BSB merger  are  estimated  to be in the range of
         $16.0  million to $17.0 million  ($11.5  million to $12.5 million after
         taxes).  These estimates include primarily  investment banking,  legal,
         accounting, printing, data processing and system integration costs, and
         employee  and  contract  termination  costs.   Anticipated  merger  and
         integration  cost estimates are not included in the unaudited pro forma
         condensed  combined  statements  of  income  for  any  of  the  periods
         presented.

         The pro forma statements do not reflect potential expense reductions or
         revenue enhancements expected to be realized subsequent to consummation
         of the mergers.

         The unaudited pro forma condensed  combined  balance sheet at March 31,
         2000 only  reflects  merger and  integration  costs related to the Lake
         Ariel  merger  that  were  incurred  through  March  31,  2000.  It  is
         anticipated that there will be an additional $5.0 million of merger and
         integration  costs  incurred in the future in connection  with the Lake
         Ariel  merger.  These  additional  costs  are  not  recognized  in  the
         unaudited pro forma condensed combined balance sheet at March 31, 2000.

         The entries to record the anticipated  merger and integration  costs on
         the  unaudited  pro  forma  condensed  combined  balance  sheet  are as
         follows:

<TABLE>
<S>                                                                             <C>
         BSB
         ---
         Current tax receivable.............................................       4,500,000
         Retained earnings..................................................      12,000,000
             Other liabilities..............................................      16,500,000
</TABLE>

<TABLE>
<S>                                                                        <C>
         Pioneer American
         ----------------
         Current tax receivable.............................................      1,300,000
         Retained earnings..................................................      3,800,000
             Other liabilities..............................................      5,100,000
</TABLE>

                                       19




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