NBT BANCORP INC
424B3, 2000-04-06
NATIONAL COMMERCIAL BANKS
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                                                FILED PURSUANT TO RULE 424(B)(3)
                                                          FILE NUMBER: 333-30988


[NBT                                                          [PIONEER AMERICAN
LOGO APPEARS HERE]                                            LOGO APPEARS HERE]


MERGER PROPOSED -- YOUR VOTE IS VERY IMPORTANT

     The boards of directors of NBT Bancorp  Inc. and Pioneer  American  Holding
Company Corp. have  unanimously  agreed on a merger of Pioneer American and NBT.
Following  the  merger,  NBT will be the  surviving  corporation.  The  board of
directors of each company  believes that the merger is in the best  interests of
its  stockholders  and  unanimously  recommends  that its  stockholders  vote to
approve the merger agreement. Each of us will hold a meeting of our stockholders
to  consider  and vote  upon the  merger  agreement  and  related  matters.  NBT
stockholders  will also  consider and vote upon the issuance of NBT common stock
to the Pioneer American stockholders in the merger.

     Pioneer American  stockholders will receive as merger  consideration  1.805
shares of NBT  common  stock for each  share of Pioneer  American  common  stock
owned. We expect the merger to be a tax-free  transaction  for Pioneer  American
stockholders,  except for any cash they receive instead of fractional  shares of
NBT common stock.  After  completion of the merger,  the stockholders of NBT and
the  former   stockholders   of  Pioneer   American   will  own,   respectively,
approximately 78% and 22% of the outstanding stock of the combined company.  NBT
common stock trades on the Nasdaq National Market under the symbol "NBTB."

     We cannot  complete the merger unless the  stockholders  of both  companies
approve  it.  Approval  of the stock  issuance  and  ratification  of the merger
agreement  requires  the  affirmative  vote of the  holders of a majority of the
shares of NBT common stock present and voting and entitled to vote.  Approval of
the merger  agreement  requires the  affirmative  vote of the holders of seventy
percent of the outstanding  shares of Pioneer  American common stock entitled to
vote. PLEASE COMPLETE, SIGN, DATE AND PROMPTLY RETURN THE ENCLOSED PROXY CARD IN
THE ENCLOSED POSTAGE-PAID ENVELOPE.

     The dates, times and places of the stockholders' meetings are as follows:

FOR NBT STOCKHOLDERS:                         FOR PIONEER AMERICAN STOCKHOLDERS:

May 16, 2000                                  May 16, 2000
at 2:00 p.m. local time                       at 10:00 a.m. local time
Holiday Inn Arena                             Heart Lake Lodge
2-8 Hawley Street                             1299 Heart Lake Road
Binghamton, New York                          Jermyn, Pennsylvania


     This  joint  proxy   statement/prospectus   provides   you  with   detailed
information  about the  merger  and the other  matters  that we will  submit for
stockholder approval at NBT's and Pioneer American's  stockholders' meetings. We
encourage  you  to  read  this  entire  document  carefully.  This  joint  proxy
statement/prospectus  incorporates  important business and financial information
about NBT and Pioneer  American  that is not included in or delivered  with this
document. See "Where You Can Find More Information" on page 115.


/s/ Daryl R. Forsythe                   /s/ John W. Reuther
- ---------------------                   -------------------
Daryl R. Forsythe                       John W. Reuther
President and Chief Executive Officer   President and Chief Executive Officer of
of NBT Bancorp Inc.                     Pioneer American Holding Company Corp.


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

     Joint proxy  statement/prospectus  dated April 3, 2000, and first mailed to
stockholders on or about April 5, 2000.



<PAGE>


                                NBT Bancorp Inc.
                              52 South Broad Street
                             Norwich, New York 13815

                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

     NBT Bancorp Inc., a Delaware  corporation,  will hold an annual  meeting of
stockholders at the Holiday Inn Arena, 2-8 Hawley Street,  Binghamton,  New York
on May 16, 2000 at 2:00 p.m. local time for the following purposes:

     1. Election of  Directors.  To fix the number of directors at twelve and to
elect the six candidates listed in the joint proxy statement/prospectus.

     2. To  ratify  the  Board of  Directors'  action  in its  selection  of its
independent auditor for the year 2000.

     3. To consider and vote upon the NBT Employee Stock Purchase Plan.

     4. To consider and vote upon a proposal to issue  approximately 5.2 million
shares of NBT common stock in the merger and to ratify the Agreement and Plan of
Merger,  dated as of December 7, 1999, and amended as of March 7, 2000,  between
NBT and Pioneer  American  Holding  Company Corp.,  a Pennsylvania  corporation,
which will approve the merger and the following  actions described in the merger
agreement:

     o    Pioneer  American  will merge with a subsidiary  of NBT,  with Pioneer
          American being the surviving corporation,

     o    Following the first merger,  Pioneer American will merge with and into
          NBT, with NBT being the surviving corporation, and

     o    NBT will issue approximately 5.2 million shares of common stock to the
          Pioneer American stockholders upon completion of the merger.

     5. To  transact  such other  business as may  properly  come before the NBT
annual meeting.

     We  describe  more  fully  the  election  of  directors,  selection  of the
independent  auditor, the issuance of NBT common stock and the merger agreement,
the merger and related matters in the attached joint proxy statement/prospectus,
which includes a copy of the merger agreement as Appendix A.

     We have fixed the close of business on April 3, 2000 as the record date for
determining those stockholders of NBT entitled to vote at the NBT annual meeting
and any adjournments or postponements of the meeting.  Only holders of record of
NBT common stock at the close of business on that date are entitled to notice of
and to vote at the NBT annual meeting.

     The board of directors of NBT  unanimously  recommends  that you vote "FOR"
approval  of each of the  nominated  directors,  including  fixing the number of
directors  at  twelve,   ratification  of  the  NBT  Board's  selection  of  the
independent  auditor,  approval of the NBT Employee Stock Purchase Plan, and the
issuance  of  NBT  common  stock  in  the  merger  with  Pioneer   American  and
ratification  of the  merger  agreement,  the  mergers  and  the  other  matters
contemplated by the merger agreement.  The affirmative vote of a majority of the
shares of NBT  common  stock  present  and voting  and  entitled  to vote at the
meeting is required to approve the ratification of the auditor proposal, the NBT
Employee Stock Purchase Plan, and the issuance of NBT common stock in the merger
with Pioneer American and the merger agreement and related matters.  A plurality
of the NBT shares  present  and voting and  entitled  to vote at the  meeting is
required to elect the nominated directors.

     The  board  of  directors  of NBT  requests  that  you fill in and sign the
enclosed  proxy card and mail it  promptly in the  accompanying  postage-prepaid
envelope.  You may revoke any proxy that you deliver prior to the NBT meeting by
delivering  a written  notice to NBT stating that you have revoked your proxy or
by  delivering a later dated proxy.  Stockholders  of record of NBT common stock
who attend the NBT  meeting  may vote in  person,  even if they have  previously
delivered a signed proxy.

                                           By Order of the Board of Directors of
                                           NBT Bancorp Inc.
                                           /s/ Daryl R. Forsythe
                                           ---------------------
                                           Daryl R. Forsythe
                                           President and Chief Executive Officer

Norwich, New York
April 5, 2000


                                        2

<PAGE>



                     PIONEER AMERICAN HOLDING COMPANY CORP.

                              41 NORTH MAIN STREET

                         CARBONDALE, PENNSYLVANIA 18407

                    NOTICE OF SPECIAL MEETING OF STOCKHOLDERS

     Pioneer  American Holding Company Corp., a Pennsylvania  corporation,  will
hold a special  meeting of  stockholders  at Heart Lake  Lodge,  1299 Heart Lake
Road,  Jermyn,  Pennsylvania  on May 16,  2000 at 10:00 a.m.  local time for the
following purposes:

     1. To consider and vote upon a proposal to adopt the  Agreement and Plan of
Merger,  dated as of December 7, 1999,  and amended as of March 7, 2000,  by and
between Pioneer  American and NBT Bancorp Inc., a Delaware  corporation,  and to
approve the merger and other transactions described in the merger agreement; and

     2. To transact such other  business as may properly come before the Pioneer
American special meeting.

     We describe more fully the merger and related  matters and  transactions in
the attached  joint proxy  statement/prospectus,  which includes as Appendix A a
copy of the merger agreement.

     We have fixed the close of  business  on March 24,  2000 as the record date
for determining the  stockholders  of Pioneer  American  entitled to vote at the
Pioneer  American  special meeting and any  adjournments or postponements of the
meeting. Only holders of record of Pioneer American common stock at the close of
business  on that date are  entitled  to  notice  of and to vote at the  Pioneer
American special meeting.

     The board of directors of Pioneer  American  recommends that you vote "FOR"
approval of the merger agreement,  the merger and the other matters contemplated
by the  merger  agreement.  The  affirmative  vote  of  seventy  percent  of the
outstanding  shares of Pioneer  American  common  stock  entitled to vote at the
meeting is required to approve the merger agreement and related matters. Pioneer
American  stockholders  have a right to dissent to the merger  agreement  and to
obtain  payment in cash of the fair value of their  Pioneer  American  shares by
complying  with  the  procedures  described  in  the  accompanying  joint  proxy
statement/prospectus.

     The board of directors of Pioneer  American  requests  that you fill in and
sign  the  enclosed  proxy  card  and  mail  it  promptly  in  the  accompanying
postage-prepaid envelope. You may revoke any proxy that you deliver prior to the
Pioneer  American  special  meeting by delivering a writing to Pioneer  American
stating  that you have  revoked the proxy or by  delivering a later dated proxy.
Stockholders  of record of Pioneer  American common stock who attend the Pioneer
American  meeting may vote in person,  even if they have previously  delivered a
signed proxy.

                                          By Order of the Board of Directors of
                                          Pioneer American Holding Company Corp.

                                          /s/ John W. Reuther
                                          -------------------
                                          John W. Reuther
                                          President and Chief Executive Officer

Carbondale, Pennsylvania
April 5, 2000


                                        3

<PAGE>


         QUESTIONS AND ANSWERS ABOUT THE MERGER AND RELATED TRANSACTIONS

Q: WHAT DO I NEED TO DO NOW?

A: After you have  carefully  read this joint proxy  statement/prospectus,  just
indicate  on your  proxy card how you want your  shares to be voted,  then sign,
date and mail it in the  enclosed  postage-paid  envelope as soon as possible so
that your shares may be  represented  and voted at the NBT annual meeting or the
Pioneer American special meeting.

     In  addition,  you may attend  your  company's  meeting in person and vote,
whether or not you have signed and mailed your proxy card.

     If you sign  and send in your  proxy  and do not  indicate  how you want to
vote, your proxy will be counted as a vote in favor of all the proposals. If you
do not vote or abstain  from  voting,  it will have the effect of a vote against
the proposals (other than regarding the election of directors,  where a non-vote
will have no effect).

Q: IF MY SHARES ARE HELD IN "STREET  NAME" BY MY BROKER,  WILL MY BROKER VOTE MY
SHARES FOR ME?

A: No. Your broker will vote your shares only if you provide instructions on how
to vote. You should follow the directions  provided by your broker. Your failure
to instruct  your broker to vote your  shares will be the  equivalent  of voting
against the adoption of the merger agreement.

Q: CAN I CHANGE MY VOTE AFTER I HAVE MAILED MY SIGNED PROXY CARD?

A: Yes.  There are three ways for you to revoke your proxy and change your vote.
First, you may send a later-dated,  signed proxy card before the meeting of your
company.  Second,  you may  attend  your  company's  meeting in person and vote.
Third, you may revoke any proxy by written notice to the Chief Executive Officer
of NBT or Pioneer American, as appropriate,  prior to your company's meeting. If
you have  instructed  a broker to vote your shares,  you must follow  directions
received from your broker to change your vote.

Q: SHOULD I SEND IN MY STOCK CERTIFICATES NOW?

A: No.  You  should  not  send in your  stock  certificates  at this  time.  NBT
stockholders   will  not  exchange  their   certificates  in  the  merger.   The
certificates currently representing shares of NBT common stock will represent an
equal number of shares of common stock of the combined company after the merger.
Following the merger,  NBT will mail instructions to all former Pioneer American
stockholders for exchanging their stock certificates.

Q: WHEN DO YOU EXPECT TO MERGE?

A: We are  working  towards  completing  the merger as quickly as  possible.  We
expect to complete the merger in the second quarter of 2000.

Q: WHOM  SHOULD I CALL WITH  QUESTIONS  OR TO OBTAIN  ADDITIONAL  COPIES OF THIS
JOINT PROXY STATEMENT/PROSPECTUS?

NBT Bancorp Inc.                          Pioneer American Holding Company Corp.
52 South Broad Street                     41 North Main Street
Norwich, New York  13815                  Carbondale, Pennsylvania  18407
Attention: Michael J. Chewens, CPA        Attention: Patricia A. Cobb, Esq.
Phone Number: (607) 337-6520              Phone Number: (570) 282-8045


                                        4

<PAGE>


                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                               Page
                                                                                                               ----
<S>                                                                                                              <C>
MERGER PROPOSED -- YOUR VOTE IS VERY IMPORTANT....................................................................1

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS..........................................................................2

NOTICE OF SPECIAL MEETING OF STOCKHOLDERS.........................................................................3

QUESTIONS AND ANSWERS ABOUT THE MERGER AND RELATED TRANSACTIONS...................................................4

SUMMARY  .........................................................................................................9
         The Merger...............................................................................................9
              What Pioneer American Stockholders Will Receive as a Result of the Merger...........................9
              NBT Stockholders Will Not Exchange Their NBT Shares.................................................9
              Ownership of Combined Company Following the Merger..................................................9
              Inclusion of Shares of NBT Stock for Trading on the Nasdaq National Market.........................10
              NBT Plans to Continue its Dividend Policy Following the Merger.....................................10
              Comparison of Pioneer American Stockholders' Rights Before and After the Merger....................10
              Transaction Generally Tax-Free to Pioneer American Stockholders....................................11
              Pioneer American Stockholders Will Have Dissenters' Rights.........................................11
              Board of Directors and Management of the Combined Company Following the Merger.....................11
              Comparative Per Share Market Price Information.....................................................11
              Our Financial Advisors Believe the Exchange Ratio is Fair to Stockholders..........................12
              We Expect "Pooling of Interests" Accounting Treatment..............................................12
              When We Expect the Merger to Close.................................................................12
              Our Reasons for the Merger.........................................................................12
              We Recommend That NBT Stockholders Approve the Stock Issuance and Ratify the Merger
                  Agreement and That Pioneer American Stockholders Approve the Merger Agreement..................13
              Other Interests of Pioneer American Officers and Directors in the Merger...........................13
              Completion of the Merger Requires Satisfaction of Various Conditions...............................14
              We May Amend the Terms of the Merger and Waive Some Conditions.....................................14
              We May Decide Not to Complete the Merger...........................................................14
              Pioneer American Has Granted NBT an Option to Purchase 19.9% of its Stock..........................15
              We Have Not Yet Received the Required Regulatory Approvals.........................................15
         The Companies...........................................................................................15
         The Stockholders' Meetings..............................................................................16
         You May Change Your Vote If You Wish....................................................................17
         Additional Information..................................................................................18
         Selected Historical and Pro Forma Combined Financial Data...............................................19
         Unaudited Comparative Per Share Data....................................................................26

THE STOCKHOLDERS' MEETINGS.......................................................................................27
         The NBT Annual Meeting..................................................................................27
              When and Where the NBT Annual Meeting Will Be Held.................................................27
              What Will Be Voted on at the NBT Annual Meeting....................................................27
              Stockholders Entitled to Vote......................................................................27
              Vote Required to Approve the Proposals.............................................................27
              Number of Shares that Must Be Represented for a Vote to Be Taken...................................28
</TABLE>

                                        5

<PAGE>


<TABLE>
<CAPTION>
                                                                                                               Page
                                                                                                               ----
<S>                                                                                                              <C>
              Voting Your Shares.................................................................................28
              How Proxies Are Counted............................................................................29
              Changing Your Vote.................................................................................29
              Independent Auditors to Be Present at the Annual Meeting...........................................29
              Solicitation of Proxies and Costs..................................................................29
              Recommendations of NBT Board.......................................................................30
         The Pioneer American Special Meeting....................................................................30
              When and Where the Pioneer American Special Meeting Will Be Held...................................30
              What Will Be Voted on at the Pioneer American Special Meeting......................................30
              Stockholders Entitled to Vote......................................................................30
              Vote Required to Approve the Merger................................................................31
              Number of Shares that Must Be Represented for a Vote to Be Taken...................................31
              Voting Your Shares.................................................................................31
              How Proxies Are Counted............................................................................31
              Changing Your Vote.................................................................................31
              Independent Auditors to Be Present at the Special Meeting..........................................32
              Solicitation of Proxies and Costs..................................................................32
              Recommendation of Pioneer American Board...........................................................32

PROPOSAL 1.......................................................................................................33
         ELECTION OF DIRECTORS...................................................................................33
         Board Meetings and Committees of the Board..............................................................37
              Nominating, Organization and Board Affairs Committee:..............................................37
              Compensation and Benefits Committee................................................................37
              Audit, Compliance and Loan Review Committee........................................................38
         Section 16(a) Beneficial Ownership Reporting Compliance.................................................38
         Compensation of Directors and Officers..................................................................38
         Board of Directors Fees.................................................................................38
              Executive Compensation.............................................................................38
              Option Grants Information..........................................................................40
              Aggregate Option Exercises in Last Fiscal Year and Fiscal Year-End Option Values...................40
              Retirement Plan....................................................................................40
              Employment Agreements..............................................................................42
              Change In Control Agreements.......................................................................43
              Supplemental Retirements Benefits..................................................................43
              Daryl R. Forsythe Employment.......................................................................44
              Compensation Committee Interlocks and Insider Participation........................................44
              Compensation Committee Report On Executive Compensation............................................45
              Members of the Compensation and Benefits Committee.................................................47
              401(k) and Employee Stock Ownership Plan...........................................................47
              Stock Option Plan..................................................................................48
              Federal Income Tax Consequences....................................................................49
              Executive Incentive Compensation Plan..............................................................49
              Personal Benefits..................................................................................50
              Related Party Transactions ........................................................................50
              Performance Graph..................................................................................51

PROPOSAL 2.......................................................................................................51
         PROPOSAL TO RATIFY THE BOARD OF DIRECTORS ACTION IN SELECTION OF KPMG LLP AS
              NBT'S INDEPENDENT AUDITOR..........................................................................51

PROPOSAL 3.......................................................................................................52
         APPROVAL OF THE NBT EMPLOYEE STOCK PURCHASE PLAN........................................................52
              Vote Required......................................................................................52
</TABLE>

                                        6

<PAGE>


<TABLE>
<CAPTION>
                                                                                                               Page
                                                                                                               ----
<S>                                                                                                              <C>
              Summary of the ESPP................................................................................52
              Federal Income Tax Consequences....................................................................54

PROPOSAL 4.......................................................................................................54
         THE ISSUANCE OF NBT COMMON STOCK IN THE MERGER AND RATIFICATION OF THE
              MERGER AGREEMENT ..................................................................................54
              General............................................................................................55
              Background of the Merger...........................................................................55
              Recommendation of the NBT Board and NBT's Reasons for the Stock Issuance and the Merger............58
              Recommendation of NBT's Board of Directors.........................................................60
              Recommendation of the Pioneer American Board and Pioneer American Reasons for the Merger...........60
              Recommendation of Pioneer American's Board of Directors............................................61
              Merger Consideration...............................................................................61
              Opinion of NBT's Financial Advisor.................................................................62
              Lake Ariel Transaction.............................................................................65
              Compensation of MB&D...............................................................................67
              Opinion of Pioneer American's Financial Advisor....................................................68
              Other Interests of Officers and Directors in the Merger............................................72
              Stock Option Agreement.............................................................................75
              Accounting Treatment...............................................................................78
              Dissenters' or Appraisal Rights....................................................................79
              Inclusion of NBT's Common Stock on Nasdaq National Market..........................................79
              Dividends..........................................................................................79
              Exchange of Pioneer American Certificates..........................................................79
              Pioneer American Stock Options.....................................................................80
              Representations and Warranties.....................................................................80
              Conduct of Business Pending Completion of the Merger...............................................81
              Conditions to Complete the Merger..................................................................84
              Termination and Termination Fees ..................................................................85
              Amendment and Waiver...............................................................................87
              Survival of Certain Provisions.....................................................................87
              Restrictions on Resales by Affiliates..............................................................88
              Fees for Financial Advisory Services...............................................................88
              Allocation of Costs and Expenses...................................................................88

THE COMPANIES....................................................................................................89
              NBT Bancorp Inc....................................................................................89
              Pioneer American Holding Company Corp..............................................................90
              Legal Proceedings..................................................................................90
              NBT Following the Merger...........................................................................90

REGULATION AND SUPERVISION.......................................................................................90
              Support of Subsidiary Banks........................................................................91
              Liability of Commonly Controlled Banks.............................................................92
              Depositor Preference Statute.......................................................................92
              Capital Requirements...............................................................................92
              Brokered Deposits..................................................................................94
              Dividend Restrictions..............................................................................94
              Deposit Insurance Assessments......................................................................94
              Interstate Banking and Branching...................................................................95
              Control Acquisitions...............................................................................95
              Financial Modernization............................................................................96
              Future Legislation.................................................................................96

MATERIAL FEDERAL INCOME TAX CONSEQUENCES.........................................................................96
</TABLE>

                                        7

<PAGE>


<TABLE>
<CAPTION>
                                                                                                               Page
                                                                                                               ----
<S>                                                                                                              <C>
PRICE RANGE OF COMMON STOCK AND DIVIDENDS........................................................................98

DESCRIPTION OF NBT CAPITAL STOCK ................................................................................99
              Authorized Capital Stock...........................................................................99
              Common Stock.......................................................................................99
              Preferred Stock....................................................................................99
              Stockholder Rights Plan...........................................................................100
              Registrar and Transfer Agent......................................................................100

COMPARISON OF STOCKHOLDERS' RIGHTS..............................................................................100
              Special Meetings of Stockholders..................................................................104
              Inspection of Voting List of Stockholders.........................................................104
              Cumulative Voting.................................................................................104
              Preemptive Rights.................................................................................104
              Classification of the Board of Directors..........................................................104
              Election of the Board of Directors................................................................104
              Removal of Directors..............................................................................105
              Additional Directors and Vacancies on the Board of Directors......................................105
              Liability of Directors............................................................................105
              Indemnification of Directors, Officers, Employees and Agents......................................106
              Restrictions upon Certain Business Combinations...................................................106
              Mergers, Share Exchanges or Asset Sales...........................................................108
              Amendments to Certificate and Articles of Incorporation...........................................109
              Amendments to Bylaws..............................................................................109
              Appraisal/Dissenters' Rights......................................................................110

RIGHTS OF DISSENTING STOCKHOLDERS...............................................................................110
              Step One - Notice of Intention to Dissent.........................................................111
              Step Two - Notice to Demand Payment...............................................................111
              Step Three - Failure to Comply with the Notice to Demand Payment..................................111
              Step Four - Payment of Fair Value of Pioneer American Shares......................................111
              Step Five - Estimate by Dissenter of Fair Value of Shares.........................................111
              Step Six - Valuation Proceedings..................................................................111

OTHER MATTERS...................................................................................................112
              Stockholder Proposals for Annual Meetings.........................................................112
              Other Matters.....................................................................................113

LEGAL MATTERS...................................................................................................113

EXPERTS  .......................................................................................................113

WHERE YOU CAN FIND MORE INFORMATION.............................................................................113
              NBT Bancorp Inc. SEC Filings......................................................................114
              Pioneer American Holding Company Corp. SEC Filings................................................114

UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS ..............................................................116

NOTES TO UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS......................................................121

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS.......................................................123



Appendix A -- Agreement and Plan of Merger, as amended

Appendix B -- Fairness Opinion of McConnell, Budd & Downes, Inc.

Appendix C -- Fairness Opinion of Danielson Associates Inc.

Appendix  D  --  Sections  1571  through  1580  of  the  Pennsylvania   Business
Corporation Law, regarding dissenters' rights

Appendix E -- NBT Employee Stock Purchase Plan
</TABLE>

                                        8

<PAGE>


                                     SUMMARY

     This  brief  summary  does  not  contain  all of the  information  that  is
important  to you.  You  should  carefully  read this  entire  document  and the
documents to which we have  referred  you to fully  understand  the merger.  See
"Where You Can Find More Information" on page 115.

                                   THE MERGER

WHAT PIONEER AMERICAN  STOCKHOLDERS  WILL RECEIVE AS A RESULT OF THE MERGER (SEE
PAGE 62)

     Pioneer American stockholders will receive 1.805 shares of NBT common stock
for each share of Pioneer American common stock that they own.

     The merger agreement provides for adjustment of the exchange ratio:

     o    either  upwards or downwards if a stock  dividend,  split-up,  merger,
          recapitalization,  combination,  conversion,  exchange  of  shares  or
          similar  transaction occurs with respect to either NBT common stock or
          Pioneer American common stock; or

     o    upwards but not downwards if:

          (1) the price of a share of NBT common stock  declines  below  $15.00,
          and

          (2) the NBT stock price  decline,  expressed as a percentage,  is more
          than 15  percentage  points  greater than the weighted  average  stock
          price decline of the index group, and

          (3) Pioneer American  exercises its right to terminate the merger as a
          result of NBT's  price  decline,  subject  to NBT's  right to  require
          Pioneer  American to complete the merger if NBT increases the exchange
          ratio as provided in the merger agreement, and

          (4) NBT elects to increase the exchange ratio in that manner.

     See "The Issuance of NBT Common Stock in the Merger and Ratification of the
Merger  Agreement -- Termination  and  Termination  Fees --  Termination  Upon a
Decline in the Value of NBT Common Stock" for a more comprehensive discussion of
this termination provision and examples of possible alternative exchange ratios.

     We will not issue fractional shares of NBT common stock in the merger.  Any
Pioneer American common stockholder who would otherwise be entitled to receive a
fraction  of a share of NBT common  stock  will  instead  receive  cash for such
fractional share.

     Pioneer American  stockholders  should not send in their stock certificates
for exchange  until  instructed  to do so after we complete the merger (see page
81).

NBT STOCKHOLDERS WILL NOT EXCHANGE THEIR NBT SHARES

     Stockholders  of NBT will continue to own their  existing  shares after the
merger.

OWNERSHIP OF COMBINED COMPANY FOLLOWING THE MERGER

     As a result of the merger,  the former Pioneer American  stockholders  will
own  approximately  22% of the  outstanding  common  stock of NBT,  assuming  no
Pioneer American stockholder  exercises  dissenters' rights. The stockholders of
NBT will own approximately 78% of the outstanding stock of NBT.

                                        9

<PAGE>


INCLUSION OF SHARES OF NBT STOCK FOR TRADING ON THE NASDAQ  NATIONAL MARKET (SEE
PAGE 80)

     NBT will list the shares of common  stock to be issued to Pioneer  American
common  stockholders  in the merger on the  Nasdaq  National  Market.  After the
merger,  NBT will  deregister the Pioneer  American common stock for purposes of
the Securities Exchange Act of 1934.

NBT PLANS TO CONTINUE ITS DIVIDEND POLICY FOLLOWING THE MERGER (SEE PAGE 80)

     The current  annualized  rate of cash dividends on the shares of NBT common
stock is $0.68 per share. After the merger, NBT expects that it will continue to
pay  quarterly  cash  dividends  in a manner  that is  consistent  with its past
practices, subject to approval and declaration by its board. The payment of cash
dividends  by NBT in the  future  will  depend on its  financial  condition  and
earnings, business conditions and other factors.

COMPARISON OF PIONEER AMERICAN  STOCKHOLDERS' RIGHTS BEFORE AND AFTER THE MERGER
(SEE PAGE 102)

     We have  summarized  below the  material  differences  in the rights of the
stockholders  of Pioneer  American and NBT. After the merger,  Pioneer  American
stockholders will have the same rights as NBT stockholders.

           NBT BANCORP INC.               PIONEER AMERICAN HOLDING COMPANY CORP.
           ----------------               --------------------------------------

NBT is a Delaware  corporation and the    Pioneer  American  is  a  Pennsylvania
rights   of   its   stockholders   are    corporation  and  the  rights  of  its
generally subject to the corporate law    stockholders are generally  subject to
of Delaware.                              the corporate law of Pennsylvania.

Under NBT's bylaws,  NBT  stockholders    Under   Pioneer   American's   bylaws,
have  the  right  to  call  a  special    special  meetings of the  shareholders
stockholders'  meeting at the  written    may be called at any time by the Board
request  of at least 50% of all shares    of  Directors  or by any three or more
entitled to vote at the meeting.          shareholders entitled to cast at least
                                          twenty-five  (25%) of the  vote  which
                                          all  shareholders are entitled to cast
                                          at a particular meeting.

NBT's Certificate of Incorporation and    The  Pioneer   American   Articles  of
Delaware  law limit the  ability  of a    Incorporation  require  a 70%  vote of
Delaware  corporation  to enter into a    the stockholders to approve any merger
business     combination    with    an    or   consolidation,   liquidation   or
interested  stockholder and require an    dissolution,  or  any  sale  or  other
80% vote of the outstanding NBT shares    disposition  of all  or  substantially
to accomplish such transactions.          all of the assets of the  corporation.
                                          Moreover,  Pennsylvania  law restricts
                                          business  combinations with interested
                                          stockholders.

Under  Delaware law, NBT  stockholders    Under    Pennsylvania   law,   Pioneer
may have  appraisal  rights to dissent    American stockholders have dissenters'
from    a    statutory    merger    or    rights  to  dissent   from  a  merger,
consolidation   and  obtain  the  fair    consolidation, a sale, lease, exchange
value in cash of  their of NBT  common    or  shares   disposition   of  all  or
stock,  depending  upon  the  type  of    substantially  all of the  property or
consideration they receive in exchange    assets of a Pennsylvania  corporation,
for  their  shares.  No  appraisal  or    or for other  fundamental  changes  in
dissenters'  rights are  available  to    the corporation and to obtain the fair
NBT stockholders in the merger.           value  in  cash  of  their  shares  of
                                          Pioneer American common stock.

                                       10

<PAGE>



TRANSACTION GENERALLY TAX-FREE TO PIONEER AMERICAN STOCKHOLDERS (SEE PAGE 98)

Pioneer  American  Stockholders.  We expect the merger to be tax-free to Pioneer
American  stockholders who receive shares of NBT common stock.  Cash received by
Pioneer  American  stockholders  instead  of  fractional  shares  in the  merger
generally will be taxable.

NBT  Stockholders.  Neither NBT nor its stockholders will recognize gain or loss
as a result of the merger.

     NBT and Pioneer  American  will have no  obligation  to complete the merger
unless we receive a legal  opinion that the merger will qualify as a transaction
that is generally  tax-free for federal  income tax purposes.  In that case, the
federal  income tax  treatment  of the merger  will be as we have  described  it
above. The legal opinion will not bind the Internal  Revenue  Service,  however,
which could take a different view.

PIONEER AMERICAN  STOCKHOLDERS  WILL HAVE  DISSENTERS'  RIGHTS (SEE PAGES 80 AND
112)

Pioneer American. Under Pennsylvania law, the Pioneer American stockholders have
dissenters'  rights to the payment in cash of the fair value of their  shares of
Pioneer  American common stock in connection  with the merger.  TO PERFECT THEIR
DISSENTERS'  RIGHTS,  HOLDERS OF THESE SHARES OF PIONEER  AMERICAN  COMMON STOCK
MUST FOLLOW REQUIRED STATUTORY PROCEDURES, INCLUDING FILING NOTICES WITH PIONEER
AMERICAN,  AND EITHER  ABSTAINING OR VOTING AGAINST THE MERGER AGREEMENT AND THE
MERGER. If you hold shares of Pioneer American common stock and you dissent from
the merger  agreement  and the merger and follow the required  procedures,  your
shares of Pioneer  American  common  stock will not become  shares of NBT common
stock upon completion of the merger. Instead, your only right will be to receive
the value of your shares in cash. We have attached the applicable  provisions of
Pennsylvania   law   related  to   dissenters'   rights  to  this  joint   proxy
statement/prospectus as Appendix D.

NBT. Under Delaware law, the NBT stockholders  will not have dissenters'  rights
or appraisal rights in connection with the merger.

BOARD OF DIRECTORS AND MANAGEMENT OF THE COMBINED  COMPANY  FOLLOWING THE MERGER
(SEE PAGE 92)

     In connection with the merger, the size of the NBT Board will increase from
twelve  directors to fifteen  directors.  Three  individuals  who are  presently
directors of Pioneer American will serve on the NBT Board following the merger.

     After the merger,  the current  executive  officers of NBT will continue to
hold the same  offices.  NBT  intends  that Mr.  John W.  Reuther,  the  current
President and Chief  Executive  Officer of Pioneer  American and its subsidiary,
Pioneer  American  Bank,  continue to function as President and Chief  Executive
Officer of the subsidiary  bank until such time as NBT merges  Pioneer  American
Bank into the  successor  entity  which  will  include  all of the  northeastern
Pennsylvania  operations,  at which time Mr.  Reuther will become  President and
Chief Operating Officer of that successor wholly-owned subsidiary of NBT.

COMPARATIVE PER SHARE MARKET PRICE INFORMATION (SEE PAGE 99)

     Shares of NBT common stock trade on the Nasdaq National Market.  The shares
of Pioneer American common stock trade in the  over-the-counter  market, and the
trades of Pioneer  American  common  stock are  reported on the Nasdaq  bulletin
board.  On  December  7,  1999,  the last full  trading  day prior to the public
announcement of the signing of the merger agreement,  and on March 27, 2000, the
last trading day prior to the printing of this  document,  the closing prices of
NBT common stock and Pioneer American common stock were as follows:

                                       11

<PAGE>



                                            DECEMBER 7, 1999      March 27, 2000
                                            ----------------      --------------
NBT.................................            $16.25               $14.25
Pioneer American ...................            $27.75               $22.25

Equivalent Market Value Per
    Share of Pioneer American.......            $29.33               $25.72

     The market  prices of NBT common  stock and Pioneer  American  common stock
will  fluctuate  prior to the  merger  in the  normal  course  of  trading  on a
day-to-day  basis.  You should  obtain  current stock price  quotations  for NBT
common stock and Pioneer  American  common stock.  You can get these  quotations
from a newspaper, on the Internet, or by calling your broker.

OUR FINANCIAL  ADVISORS BELIEVE THE EXCHANGE RATIO IS FAIR TO STOCKHOLDERS  (SEE
PAGES 63 AND 69)

NBT. NBT received an opinion from McConnell,  Budd & Downes, Inc., its financial
advisor,  to the effect that as of the date of such opinion the  exchange  ratio
was fair to the  stockholders of NBT from a financial point of view.  McConnell,
Budd & Downes  subsequently  affirmed  its  opinion as of the date of this joint
proxy  statement/prospectus.  We attach a copy of the  McConnell,  Budd & Downes
opinion as Appendix B.

Pioneer American. Pioneer American received an opinion from Danielson Associates
Inc.,  its financial  advisor,  to the effect that the  financial  consideration
which Pioneer American  stockholders  will receive in the merger was fair to the
Pioneer  American  stockholders  from a financial  point of view.  We attach the
written   opinion   of   Danielson   as   Appendix   C  to  this   joint   proxy
statement/prospectus.

     We  recommend  that  each  NBT  stockholder   and  each  Pioneer   American
stockholder  read each opinion  carefully in their  entirety to  understand  the
assumptions made,  matters  considered,  and limitations on review undertaken by
each financial advisor.

WE EXPECT "POOLING OF INTERESTS" ACCOUNTING TREATMENT (SEE PAGE 79)

     We expect the merger to qualify  as a "pooling  of  interests."  This means
that,  for  accounting  and  financial  reporting  purposes,  we will  treat our
companies  as if they had always  been one  company.  We will not be required to
complete  the merger  unless we receive a letter  from our  independent  auditor
stating that the merger qualifies for pooling of interests accounting treatment.

WHEN WE EXPECT THE MERGER TO CLOSE (SEE PAGE 55)

     We  expect  completion  of the  merger  as  soon as  practicable  following
approval of the merger by the  stockholders of NBT and Pioneer American at their
respective stockholders meetings and satisfaction of all other conditions to the
merger.  We anticipate  completion  of the merger  during the second  quarter of
2000.

OUR REASONS FOR THE MERGER

NBT.  We recommend the merger because:

     o    the merger will permit NBT to diversify  its  operations by broadening
          its  operations  in  Pennsylvania  beyond the market  area of LA Bank,
          which NBT acquired in February, 2000

     o    the merger will afford NBT an  opportunity  to expand the  delivery of
          its financial  services,  especially its trust services,  to a broader
          and more disparate customer base

     o    the financial  resources of the combined company  following the merger
          will  permit NBT to broaden  its product  capabilities  and  services,
          respond to changes in the  financial  services  industry,  and compete
          more effectively with other financial institutions within its expanded
          geographical service area

                                       12

<PAGE>


     o    the  anticipated  positive  financial  impact of the merger upon NBT's
          future  financial  performance  will  enhance  stockholder  return  by
          achieving operating efficiencies and cost savings

     To review the NBT  Board's  reasons for the merger in greater  detail,  see
page 59.

Pioneer American.  We recommend the merger because:

     o    NBT offers a broader  range of products  and  services  and the merger
          would provide Pioneer American customers with access to these products
          and services without Pioneer American having to undergo the expense of
          introducing them on its own

     o    the  exchange  ratio  resulted  in a value of $29.33 per share or 5.7%
          premium to the  closing  price of  Pioneer  American  common  stock on
          December  7,  1999  and  an  increase  of   dividends   per  share  to
          approximately   $.307   ($1.228   annualized)   or  an   increase   of
          approximately 53.5% on December 7, 1999

     o    the  anticipated  cost  savings  and  efficiencies  available  to  the
          combined  company could result in a better return to Pioneer  American
          stockholders

     To review the Pioneer  American  Board's  reasons for the merger in greater
detail, see page 61.

WE RECOMMEND  THAT NBT  STOCKHOLDERS  APPROVE THE STOCK  ISSUANCE AND RATIFY THE
MERGER  AGREEMENT  AND THAT  PIONEER  AMERICAN  STOCKHOLDERS  APPROVE THE MERGER
AGREEMENT (SEE PAGES 59 AND 61)

NBT. The NBT Board  believes  that the merger is fair to you and is in your best
interests,  and unanimously recommends that you vote FOR the proposal to approve
the  issuance  of NBT  common  stock in the  merger  and to  ratify  the  merger
agreement, the merger and the related matters.

Pioneer American. The Pioneer American Board believes that the merger is fair to
you and is in your best interests,  and unanimously recommends that you vote FOR
the  proposal  to approve  the  merger  agreement,  the  merger and the  related
matters.

OTHER  INTERESTS OF PIONEER  AMERICAN  OFFICERS AND DIRECTORS IN THE MERGER (SEE
PAGE 73)

     Several  officers  and  directors,  who are also  stockholders,  of Pioneer
American  will  receive  benefits as a result of the merger  that are  different
from, or in addition to, the benefits you will receive.  These benefits  include
the following:

     o    John W.  Reuther,  President  and Chief  Executive  Officer of Pioneer
          American, will receive an employment agreement with NBT, following the
          merger;

     o    some  Pioneer   American   officers  will  receive   change-in-control
          agreements  with  NBT,  which  provide  for  severance  benefits  upon
          termination of their  employment upon a covered change in control (see
          "The  Issuance of NBT Common Stock in the Merger and  Ratification  of
          the Merger  Agreement -- Other  Interests of Officers and Directors in
          the Merger -- Change-in-Control Agreements");

     o    NBT will assume and continue in effect some  retirement  and insurance
          agreements  between Pioneer  American and/or Pioneer American Bank and
          Mr. Reuther after the merger;

                                       13

<PAGE>


     o    NBT will  take no  action  to  reduce  any  right  to  indemnification
          provided under Pioneer American's  Articles of Incorporation or bylaws
          existing  in favor of the current or former  directors  or officers of
          Pioneer American; and

     o    Following the effective time of the merger and to the extent permitted
          by law, all rights to such  indemnification will survive, and NBT will
          honor such  obligations  with  respect to events,  acts,  or omissions
          occurring prior to the merger.

COMPLETION OF THE MERGER REQUIRES  SATISFACTION OF VARIOUS  CONDITIONS (SEE PAGE
85)

     We must satisfy a number of  conditions  before  completion  of the merger,
including:

     o    approval of the common stock issuance and  ratification  of the merger
          proposal by the NBT stockholders;

     o    approval of the proposed merger by Pioneer American stockholders;

     o    approval by government regulators;

     o    authorization by Nasdaq of the inclusion on the Nasdaq National Market
          of the NBT common stock to be issued to Pioneer American stockholders;

     o    NBT and Pioneer American receive a legal opinion  regarding  treatment
          of the merger as a tax-free reorganization under Section 368(a) of the
          Internal Revenue Code of 1986, as amended; and

     o    NBT receives a letter from its  independent  auditor  stating that the
          merger qualifies for "pooling of interests" accounting treatment.

     Where the law  permits,  NBT or  Pioneer  American  may  waive  some of the
conditions  to the merger if it deems such a waiver to be in the best  interests
of its  stockholders.  Although we anticipate  completing  the merger during the
second  quarter of 2000, we cannot be certain when (or if) the conditions to the
merger will be satisfied or when we will complete the merger.

WE MAY AMEND THE TERMS OF THE MERGER AND WAIVE SOME CONDITIONS (SEE PAGE 88)

     We may jointly amend the terms of the merger, and each of us could elect to
waive conditions to completion of the merger, to the extent legally permissible.
However,  after our  stockholders  approve the merger  agreement and the merger,
they must  approve  any  amendment  or waiver  that  would  reduce or change the
consideration that they will receive upon completion of the merger.

WE MAY DECIDE NOT TO COMPLETE THE MERGER (SEE PAGE 85)

     We can agree to terminate  the merger  agreement at any time.  In addition,
either of us may terminate the merger agreement if any of the following occurs:

     o    the merger is not completed by July 31, 2000;

     o    a  determination  that the other  party has  materially  breached  the
          merger  agreement,  and has not  cured  the  breach  within  the  time
          allowed, or a determination that the representations and warranties of
          the other company were materially incorrect when made; or

                                       14

<PAGE>


     o    a decline in the price of NBT common stock beyond the limits specified
          in the merger  agreement and Pioneer  American  exercises its right to
          cancel the merger,  subject to NBT's right to  increase  the  exchange
          ratio and NBT elects not to increase the exchange ratio.

PIONEER  AMERICAN HAS GRANTED NBT AN OPTION TO PURCHASE  19.9% OF ITS STOCK (SEE
PAGE 77)

     As a condition to NBT's willingness to enter into the merger agreement, and
to discourage  other  companies  from  attempting to acquire  Pioneer  American,
Pioneer  American  granted  NBT an option to purchase up to 19.9% of the Pioneer
American common stock outstanding immediately before the exercise of such option
at an exercise price of $24.00 per share.  The option is  exercisable  only upon
occurrence  of  specified  events that would be  ordinarily  associated  with an
acquisition or potential acquisition of Pioneer American by a third party.

WE HAVE RECEIVED THE REQUIRED REGULATORY APPROVALS

     Completion of the merger requires the approval by the Federal Reserve Board
and the Pennsylvania  Department of Banking.  The U.S. Department of Justice has
input into this approval  process.  Once the Federal  Reserve Board approves the
merger,  we have to wait at least 15 days and may have to wait for up to 30 days
before we can complete the merger.

     We have filed all of the required applications and notices with the Federal
Reserve  Board and the  Pennsylvania  Department  of Banking.  The  Pennsylvania
Department  of Banking  approved the merger on March 20,  2000,  and the Federal
Reserve Board approved the merger on March 30, 2000.


                                  THE COMPANIES

NBT BANCORP INC.
52 South Broad Street
Norwich, New York  13815
(607) 337-2265

     NBT,  a  registered  bank  holding  company  incorporated  in the  State of
Delaware,  is the parent holding company of NBT Bank, N.A., 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,
NBT completed its  acquisition of Lake Ariel  Bancorp,  Inc., the parent holding
company of LA Bank, National Association. Upon completion of the merger, LA Bank
became a  wholly-owned  subsidiary of NBT. LA Bank provides  commercial  banking
products and services in  northeastern  Pennsylvania.  The  following  financial
information  reflects  the  merger of NBT and Lake Ariel on a pooled  basis.  In
fiscal year 1999,  NBT's net income was $22.2 million while in fiscal year 1998,
NBT's net income was $22.9 million.  As of December 31, 1999, NBT's total assets
were approximately $2.0 billion,  total deposits were approximately $1.5 billion
and stockholders'  equity was approximately $159.9 million.

PIONEER AMERICAN HOLDING COMPANY CORP.
41 North Main Street
Carbondale, Pennsylvania 18407
(570) 282-2662

     Pioneer  American,  a registered bank holding  company  incorporated in the
Commonwealth of Pennsylvania,  is the parent holding company of Pioneer American
Bank, National Association. Pioneer American Bank provides

                                       15

<PAGE>


commercial banking products and services in northeastern Pennsylvania. In fiscal
year 1999,  Pioneer  American's net income was $4.1 million while in fiscal year
1998, Pioneer  American's net income was $4.0 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.    We   enclose   with   this   joint   proxy
statement/prospectus a copy of Pioneer American's annual report on SEC Form 10-K
for the year ended December 31, 1999.


                           THE STOCKHOLDERS' MEETINGS

NBT. NBT will hold its annual meeting of  stockholders at the Holiday Inn Arena,
2-8 Hawley Street, Binghamton, New York on May 16, 2000 at 2:00 p.m. local time.
At the NBT annual  meeting,  NBT  stockholders  will  consider and vote upon the
following proposals:

     1.   A proposal to fix the number of  directors  at twelve and to elect the
          six   candidates    listed   as   nominees   in   this   joint   proxy
          statement/prospectus;

     2.   A proposal to ratify the NBT Board's  action of the  selection of KPMG
          LLP as NBT's independent auditor for the year 2000;

     3.   A proposal to approve the NBT Employee Stock Purchase Plan; and

     4.   A proposal to approve the  issuance of NBT common  stock in the merger
          and to ratify the merger agreement,  which will approve the merger and
          the following actions described in the merger agreement:

          o    Pioneer American will merge with an NBT subsidiary,  with Pioneer
               American being the surviving corporation;

          o    Pioneer  American will  thereafter  merge with and into NBT, with
               NBT being the surviving corporation;

          o    Pioneer  American Bank will become a  wholly-owned  subsidiary of
               NBT or part of the  northeastern  Pennsylvania  operations of any
               successor entity to Pioneer American Bank;

          o    NBT will issue  approximately  5.2  million  shares of its common
               stock to the stockholders of Pioneer American in the merger; and

          o    Following  the  merger,  the NBT Board will expand from twelve to
               fifteen  members  to include  three  directors  from the  current
               Pioneer American Board.

     Only  holders of record of NBT  common  stock at the close of  business  on
April 3, 2000,  which is the record  date for the NBT  annual  meeting,  will be
entitled to vote at the NBT annual meeting and any adjournments or postponements
of the  meeting.  You can cast one vote for each share of NBT common  stock that
you owned on the record date for each matter proposed at the NBT annual meeting.

     Approval  of the  proposal  to ratify the NBT  Board's  selection  of NBT's
independent  auditor  requires  the approval by the holders of a majority of the
shares of NBT common stock present and voting and entitled to vote at the annual
meeting.  Election of the  directors  nominated  by the NBT Board  requires  the
approval of a plurality of the shares of NBT common stock present and voting and
entitled to vote at the annual meeting. Approval of NBT's issuance of its common
stock to the Pioneer American stockholders in the merger and ratification of the
merger

                                       16

<PAGE>


agreement and completion of the merger require, among other things,  approval by
the holders of a majority of the shares of NBT common  stock  present and voting
and entitled to vote at the NBT annual meeting.

     As of December 31, 1999,  directors and executive officers of NBT and their
affiliates were the beneficial owners of approximately  5.66% of the outstanding
shares of NBT common stock, and a total of 13,097,996 shares of NBT common stock
were eligible to be voted at the NBT annual meeting. Following the merger of NBT
and Lake Ariel, the directors and executive officers of NBT owned  approximately
7.59% of the 18,100,868  outstanding shares of NBT common stock. These directors
and executive  officers have indicated  their  intention to vote their shares of
NBT common stock in favor of the election of the directors  nominated by the NBT
Board, ratification of the NBT Board's selection of the independent auditor, and
the  issuance  of the NBT common  stock in the merger  and  ratification  of the
merger agreement.

Pioneer American. Pioneer American will hold its special meeting of stockholders
at Heart Lake Lodge, 1299 Heart Lake Road, Jermyn,  Pennsylvania on May 16, 2000
at 10:00 a.m.  local time.  At the Pioneer  American  special  meeting,  Pioneer
American stockholders will vote upon a proposal to approve the merger agreement,
the merger and the other matters contemplated by the merger agreement.

     Only  holders of record of Pioneer  American  common  stock at the close of
business on March 24,  2000,  which is the record date for the Pioneer  American
special  meeting,  will be  entitled  to vote at the  Pioneer  American  special
meeting and any adjournments or  postponements of the meeting.  You can cast one
vote for each  share of  Pioneer  American  common  stock  that you owned on the
record date.

     Approval of the merger  agreement  and  completion  of the merger  require,
among  other  things,  approval  by  the  holders  of  seventy  percent  of  the
outstanding shares of Pioneer American common stock entitled to vote.

     As of  December  31,  1999,  directors  and  executive  officers of Pioneer
American and their affiliates were the beneficial owners of approximately 16.84%
of the  outstanding  shares of Pioneer  American  common  stock,  and a total of
2,864,307  shares of Pioneer  American common stock were eligible to be voted at
the Pioneer American special meeting.  These directors and executive officers of
Pioneer  American have indicated their intention to vote their shares of Pioneer
American common stock in favor of the merger agreement.

     Thirteen  stockholders  of Pioneer  American,  eleven of whom are  officers
and/or directors of Pioneer  American,  have agreed  individually that they will
vote in favor of the  merger  agreement  and the  merger  all  shares of Pioneer
American  common stock they  beneficially  own and that they will use their best
efforts to cause any other  shares of Pioneer  American  common stock over which
they share  voting  power to be voted in favor of the merger  agreement  and the
merger.  The number of shares  subject  to these  agreements  aggregate  550,606
shares  or  approximately  19.23% of the  outstanding  common  stock of  Pioneer
American.


                      YOU MAY CHANGE YOUR VOTE IF YOU WISH

     You may change your vote at any time before the voting of your proxy at the
stockholders' meeting. You can change your vote in any of the following ways:

     o    You can send a written  notice dated after your proxy stating that you
          would like to revoke your proxy.  If you are an NBT  stockholder,  you
          should send your written notice to the Chief Executive  Officer of NBT
          at the address below. If you are a Pioneer American  stockholder,  you
          should  send your  written  notice to the Chief  Executive  Officer of
          Pioneer American at the address below;

     o    You can  complete  a new  proxy  card  and  send it to NBT or  Pioneer
          American,  and the new  proxy  card  will  automatically  replace  any
          earlier dated proxy card that you previously returned; or

                                       17

<PAGE>


     o    You  can  attend  your  stockholders'  meeting  and  vote  in  person.
          Attending the special meeting will not by itself revoke your proxy.

     You should send any written notice of  revocation,  request for a new proxy
card or a completed new proxy card to NBT Bancorp Inc. at 52 South Broad Street,
Norwich, New York 13815,  Attention:  Chief Executive Officer, if you are an NBT
stockholder;  or Pioneer American Holding Company Corp. at 41 North Main Street,
Carbondale, Pennsylvania 18407, Attention: Chief Executive Officer, if you are a
Pioneer American stockholder.


                             ADDITIONAL INFORMATION

     If you have questions about the merger or would like  additional  copies of
this joint proxy statement/prospectus, you should contact:

For NBT Stockholders:                     For Pioneer American Stockholders:

NBT Bancorp Inc.                          Pioneer American Holding Company Corp.
52 South Broad Street                     41 North Main Street
Norwich, New York  13815                  Carbondale, Pennsylvania  18407
Attention: Michael J. Chewens, CPA        Attention: Patricia A. Cobb, Esq.
Phone Number: (607) 337-6520              Phone Number: (570) 282-8045


                                       18

<PAGE>


            SELECTED HISTORICAL AND PRO FORMA COMBINED FINANCIAL DATA
                  (IN THOUSANDS, EXCEPT PER SHARE INFORMATION)

     The following tables set forth selected  historical  financial data for NBT
and Pioneer American,  and selected  unaudited pro forma combined financial data
for the combined company. The financial information for NBT has been restated to
include  the  effects of the merger  with Lake Ariel  Bancorp,  Inc.,  which was
consummated  on  February  17, 2000 and has been  accounted  for as a pooling of
interests.  We have  derived the  selected  historical  financial  data from the
consolidated   financial   statements  of  NBT  and  Pioneer  American  and  the
supplemental  consolidated  financial  statements of NBT, which  statements have
been  incorporated  by  reference  into this  document.  NBT has filed a Current
Report  on Form  8-K  with  the SEC  which  contains  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 which have been restated
to include the effects of the Lake Ariel merger. Stockholders of each of NBT and
Pioneer American should read this information in conjunction with the historical
financial  statements and related notes of each of NBT and Pioneer  American and
the unaudited pro forma consolidated  financial  statements and related notes of
NBT  presented on pages 117 through 123. The NBT and Pioneer  American  combined
results of  operations  give  effect to NBT's  proposed  acquisition  of Pioneer
American as a pooling of interests, as if such transaction had been completed as
of the beginning of each of the periods presented.

     The pro forma  period-end  balance  sheet  information  reflects  estimated
non-recurring  charges that will be incurred in connection with the mergers. The
combined  company  expects to achieve  certain  merger  benefits  in the form of
operating expense reductions and revenue enhancements. The pro forma information
does not reflect potential operating expense reductions or revenue  enhancements
that are expected to result from the merger, 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.
Accordingly,  the unaudited  selected pro forma  combined  financial data of the
combined  company as of the  effective  time and  thereafter  may be  materially
different from the data reflected in the pro forma information below.


                                       19

<PAGE>


NBT BANCORP INC.
SELECTED FINANCIAL DATA
<TABLE>
<CAPTION>
(in thousands, except per share data)                          1999            1998            1997           1996          1995
                                                               ----            ----            ----           ----          ----
<S>                                                      <C>               <C>            <C>             <C>           <C>
FOR PERIOD ENDED
Interest and fee income                                  $   135,389       $  130,300     $   120,831     $  104,662    $   95,948
Interest expense                                              60,582           60,417          56,047         46,548        44,354
Net interest income                                           74,807           69,883          64,784         58,114        51,594
Provision for loan losses                                      5,070            5,729           4,285          3,825         2,363
Noninterest income excluding securities gains (losses)        14,705           13,857          11,590         10,346         9,107
Securities gains (losses)                                      1,716            1,056           (123)          1,222           476
Noninterest expense                                           51,500           50,580          44,380         42,419        40,787
Income before income taxes                                    34,658           28,487          27,586         23,438        18,027
Net income                                                    22,175           22,873          18,180         15,210        11,636

PER COMMON SHARE*
Basic earnings                                           $      1.24       $     1.27     $      1.06     $     0.90    $     0.67
Diluted earnings                                         $      1.23       $     1.25     $      1.05     $     0.89    $     0.67
Cash dividends paid                                      $     0.656       $    0.587     $     0.421     $    0.338    $    0.292
Stock dividends distributed                                       5%               5%              5%             5%            5%
Book value at period-end                                 $      8.91       $     9.45     $      8.84     $     7.60    $     7.48
Tangible book value at period-end                        $      8.43       $     8.90     $      8.33     $     6.96    $     6.79
Average common shares outstanding                             17,851           17,976          17,095         16,903        17,328
Average diluted common shares outstanding                     18,095           18,361          17,393         16,995        17,390

PERIOD ENDED
Assets available for sale                                $   524,090       $  452,875     $   512,013     $  442,226    $  463,882
Securities held to maturity                                   78,213          135,992          83,455         60,665        52,628
Loans                                                      1,222,654        1,051,506         945,206        832,098       738,943
Allowance for loan losses                                     16,654           15,322          13,691         12,303        10,777
Assets                                                     1,961,432        1,764,698       1,648,658      1,436,892     1,358,125
Deposits                                                   1,477,618        1,356,947       1,294,633      1,169,515     1,081,791
Short-term borrowings                                        137,567           99,872         134,727         88,544       121,345
Long-term debt                                               172,575          125,611          47,839         40,218        18,168
Stockholders' equity                                         159,874          168,572         159,158        127,436       127,553
AVERAGE BALANCES
Assets                                                   $ 1,844,635       $1,717,543     $ 1,572,709     $1,387,922    $1,293,300
Earning assets                                             1,738,603        1,612,888       1,480,874      1,297,338     1,207,411
Loans                                                      1,128,060          996,349         893,236        787,585       727,618
- ----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
Note: Dividends per share represent historical dividends of stand alone NBT.

                                       20

<PAGE>



NBT BANCORP INC.
SELECTED FINANCIAL DATA
<TABLE>
<CAPTION>
(in thousands, except per share data)                          1999            1998            1997           1996          1995
                                                               ----            ----            ----           ----          ----
<S>                                                      <C>               <C>            <C>             <C>           <C>
Deposits                                                   1,389,211        1,318,481       1,241,753      1,150,158     1,055,580
Stockholders' equity                                         164,623          164,661         136,206        123,482       119,142

KEY RATIOS
Return on average assets                                       1.20%            1.33%           1.16%          1.10%         0.90%
Return on average equity                                      13.47%           13.89%          13.35%         12.32%         9.77%
Average equity to average assets                               8.92%            9.59%           8.66%          8.90%         9.21%
Net interest margin                                            4.44%            4.44%           4.49%          4.60%         4.38%
Efficiency                                                    56.06%           59.63%          57.03%         60.60%        65.76%
Cash dividend per share payout                                53.33%           46.96%          40.10%         37.98%        43.58%
Tier 1 leverage                                                8.74%            8.90%           9.20%          8.46%         8.57%
Tier 1 risk-based capital                                     13.63%           14.54%          15.36%         13.59%        14.73%
Total risk-based capital                                      14.78%           15.71%          16.56%         14.79%        15.95%
</TABLE>

*All share and per share data has been  restated to give  retroactive  effect to
stock dividends and splits.


                                       21

<PAGE>


PIONEER AMERICAN HOLDING COMPANY CORP.
SELECTED FINANCIAL DATA
<TABLE>
<CAPTION>
(in thousands, except per share data)                             1999             1998           1997           1996         1995
                                                                  ----             ----           ----           ----         ----
<S>                                                         <C>               <C>             <C>            <C>          <C>
FOR PERIOD ENDED
Interest and fee income                                     $     29,389      $    28,302     $   26,507     $  24,358    $  23,662
Interest expense                                                  14,898           14,319         12,845        10,874       11,227
Net interest income                                               14,491           13,983         13,662        13,484       12,435
Provision for loan losses                                            370              420            535           500          420
Noninterest income excluding securities gains (losses)             2,743            2,450          2,304         2,012        1,448
Securities gains (losses)                                             88              511            157            --          465
Noninterest expense                                               11,382           10,967         10,080         9,749        9,075
Income before income taxes                                         5,570            5,557          5,508         5,247        4,853
Net income                                                         4,082            4,022          4,008         3,704        3,483

PER COMMON SHARE*
Basic earnings                                              $       1.41      $      1.39     $     1.41     $    1.32    $    1.25
Diluted earnings                                            $       1.39      $      1.36     $     1.36     $    1.26    $    1.20
Cash dividends paid                                         $      0.800      $     0.770     $    0.720     $   0.660    $   0.600
Stock dividends distributed                                           --               --             --            --           --
Book value at period-end                                    $      11.03      $     12.21     $    11.67     $   10.70    $   10.23
Tangible book value at period-end                           $      10.84      $     12.01     $    11.45     $   10.46    $    9.97
Average common shares outstanding                                  2,902            2,894          2,850         2,812        2,783
Average diluted common shares outstanding                          2,929            2,953          2,939         2,932        2,906

PERIOD ENDED
Assets available for sale                                   $    112,134      $   101,079     $   96,696     $  76,019    $  68,328
Securities held to maturity                                       36,612           46,178         37,379        20,860       26,033
Loans                                                            244,213          225,735        212,342       204,048      197,297
Allowance for loan losses                                          3,057            2,909          2,759         2,750        2,742
Assets                                                           418,775          405,157        370,126       330,213      320,647
Deposits                                                         299,473          307,360        293,643       295,946      288,252
Short-term borrowings                                              4,700               --          2,350            --           --
Long-term debt                                                    79,395           58,357         37,073           275          275
Stockholders' equity                                              31,598           35,466         33,398        30,263       28,492

AVERAGE BALANCES
Assets                                                      $    423,487      $   394,312     $  358,608     $ 326,494    $ 315,387
Earning assets                                                   395,513          367,205        332,618       301,788      293,109
Loans                                                            238,238          221,484        205,731       207,030      188,816
Deposits                                                         306,395          296,285        298,844       291,883      282,154
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                       22

<PAGE>


PIONEER AMERICAN HOLDING COMPANY CORP.
SELECTED FINANCIAL DATA
<TABLE>
<CAPTION>
(in thousands, except per share data)                             1999             1998           1997           1996         1995
                                                                  ----             ----           ----           ----         ----
<S>                                                         <C>               <C>             <C>            <C>          <C>
Stockholders' equity                                             34,436           33,877         31,379        29,017       27,024

KEY RATIOS
Return on average assets                                           0.96%            1.02%          1.12%         1.13%        1.10%
Return on average equity                                          11.85%           11.87%         12.77%        12.76%       12.89%
Average equity to average assets                                   8.13%            8.59%          8.75%         8.89%        8.57%
Net interest margin                                                3.82%            3.96%          4.27%         4.59%        4.39%
Efficiency                                                        63.70%           64.54%         61.04%        61.40%       63.40%
Cash dividend per share payout                                    57.55%           56.62%         52.94%        52.38%       50.00%
Tier 1 leverage                                                    8.11%            8.41%         8.57 %         8.96%        8.75%
Tier 1 risk-based capital                                         14.56%           15.35%         15.80%        15.28%       15.57%
Total risk-based capital                                          15.81%           16.60%         17.05%        16.53%       16.82%
</TABLE>

*All share and per share data has been  restated to give  retroactive  effect to
stock dividends and splits.

                                       23

<PAGE>


PRO FORMA COMBINED
SELECTED FINANCIAL DATA
<TABLE>
<CAPTION>
(in thousands, except per share data)                            1999           1998            1997           1996          1995
                                                                 ----           ----            ----           ----          ----
<S>                                                         <C>              <C>            <C>            <C>            <C>
FOR PERIOD ENDED
Interest and fee income                                    $    164,778     $   158,602    $   147,338    $   129,020    $  119,610
Interest expense                                                 75,480          74,736         68,892         57,422        55,581
Net interest income                                              89,298          83,866         78,446         71,598        64,029
Provision for loan losses                                         5,440           6,149          4,820          4,325         2,783
Noninterest income excluding securities gains (losses)           17,448          16,307         13,894         12,358        10,555
Securities gains (losses)                                         1,804           1,567             34          1,222           941
Noninterest expense                                              62,882          61,547         54,460         52,168        49,862
Income before income taxes                                       40,228          34,044         33,094         28,685        22,880
Net income                                                       26,257          26,895         22,188         18,914        15,119

PER COMMON SHARE*

Basic earnings                                             $       1.14     $      1.16    $      1.00    $      0.86    $     0.68
Diluted earnings                                           $       1.12     $      1.14    $      0.98    $      0.85    $     0.67
Cash dividends paid                                        $      0.656     $     0.587    $     0.421    $     0.338    $    0.292
Stock dividends distributed                                          5%              5%             5%             5%            5%
Book value at period-end                                   $       7.89     $      8.84    $      8.31    $      7.21    $     7.07
Tangible book value at period-end                          $       7.50     $      8.39    $      7.89    $      6.69    $     6.50
Average common shares outstanding                                23,089          23,199         22,239         21,979        22,353
Average diluted common shares outstanding                        23,382          23,691         22,698         22,287        22,636

PERIOD ENDED

Assets available for sale                                  $    636,224     $   553,954    $   608,709    $   518,245    $  532,210
Securities held to maturity                                     114,825         182,170        120,834         81,525        78,661
Loans                                                         1,466,867       1,277,241      1,157,548      1,036,146       936,240
Allowance for loan losses                                        19,711          18,231         16,450         15,053        13,519
Assets                                                        2,383,507       2,169,855      2,018,784      1,767,105     1,678,772
Deposits                                                      1,777,091       1,664,307      1,588,276      1,465,461     1,370,043
Short-term borrowings                                           142,267          99,872        137,077         88,544       121,345
Long-term debt                                                  251,970         183,968         84,912         40,493        18,443
Stockholders' equity                                            182,472         204,038        192,556        157,699       156,045

AVERAGE BALANCES

Assets                                                     $  2,268,122     $ 2,111,855    $ 1,931,317    $ 1,714,416    $1,608,687
Earning assets                                                2,134,116       1,980,093      1,813,492      1,599,126     1,500,520
Loans                                                         1,366,298       1,217,833      1,098,967        994,615       916,434
Deposits                                                      1,695,606       1,614,766      1,540,597      1,442,041     1,337,734
Stockholders' equity                                            199,059         198,538        167,585        152,499       146,166

KEY RATIOS

Return on average assets                                           1.16%           1.27%          1.15%          1.10%         0.94%
Return on average equity                                          13.19%          13.55%         13.24%         12.40%        10.34%

Average equity to average assets                                   8.78%           9.40%          8.68%          8.90%         9.09%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                       24

<PAGE>


PRO FORMA COMBINED
SELECTED FINANCIAL DATA
<TABLE>
<CAPTION>
(in thousands, except per share data)                            1999           1998            1997           1996          1995
                                                                 ----           ----            ----           ----          ----
<S>                                                         <C>              <C>            <C>            <C>            <C>
Net interest margin                                                4.32%           4.35%          4.45%          4.60%         4.38%
Efficiency                                                        57.31%          60.45%         57.73%         60.75%        65.31%
Cash dividend per share payout                                    58.57%          51.49%         42.96%         39.76%        43.58%
Tier 1 leverage                                                    8.63%           8.81%          9.08%          8.55%         8.61%
Tier 1 risk-based capital                                         13.78%          14.68%         15.44%         13.90%        14.89%
Total risk-based capital                                          14.95%          15.87%         16.64%         15.11%        16.11%
</TABLE>

*All share and per share data has been  restated to give  retroactive  effect to
stock dividends and splits.

                                       25

<PAGE>


                      UNAUDITED COMPARATIVE PER SHARE DATA

     We have summarized below the per common share combined  information for NBT
and  Pioneer  American on an  historical  and pro forma  combined  and pro forma
equivalent basis. The financial information for NBT has been restated to include
the effects of the merger with Lake Ariel Bancrop,  Inc.,  which was consummated
on February 17, 2000 and has been  accounted for as a pooling of interests.  The
pro forma information gives effect to the merger with Pioneer American accounted
for as a pooling of interests,  on the assumption  that our companies had always
been combined for accounting and financial reporting purposes. In presenting the
pro forma  information  for the time periods shown in the table, we assumed that
we had been merged throughout those periods. You should read this information in
conjunction with our historical  financial  statements and related notes and the
supplemental  consolidated  financial statements of NBT and related notes, which
have been restated to include the effects of the Lake Ariel merger, contained in
the reports and other  information  that we have filed with the SEC.  See "Where
You Can Find  More  Information."  You  should  also read  this  information  in
conjunction  with the pro forma combined  financial  information set forth under
the heading "Unaudited Pro Forma Combined Financial  Statements." You should not
rely on the pro forma  information  as being  indicative  of the results that we
will achieve after the merger.

     The combined  company  unaudited pro forma data represent the effect of the
merger on a share of NBT common stock. The Pioneer American pro forma equivalent
data represent the combined company pro forma data before  rounding,  multiplied
by the  conversion  ratio of 1.805  shares of NBT common stock for each share of
Pioneer American common stock, and thereby reflect the effect of the merger on a
share of Pioneer American common stock.

<TABLE>
<CAPTION>
                                                                           HISTORICAL                          PRO FORMA
                                                                  ---------------------------         ---------------------------
                                                                     NBT              PIONEER          COMBINED        PIONEER
                                                                   BANCORP           AMERICAN          COMPANY        AMERICAN
                                                                   -------           --------          -------        EQUIVALENT
                                                                                                                      ----------
<S>                                                                  <C>                <C>             <C>             <C>
Per Common Share
BASIC EARNINGS
Year - Ended:
         December 31, 1999                                           $1.24              $1.41           $1.14           $2.06
         December 31, 1998                                            1.27               1.39            1.16            2.09
         December 31, 1997                                            1.06               1.41            1.00            1.81
DILUTED EARNINGS
Year - Ended:
         December 31, 1999                                            1.23               1.39            1.12            2.02
         December 31, 1998                                            1.25               1.36            1.14            2.06
         December 31, 1997                                            1.05               1.36            0.98            1.77
CASH DIVIDEND PAID
Year - Ended:
         December 31, 1999                                           0.656              0.800           0.656           1.184
         December 31, 1998                                           0.587              0.770           0.587           1.060
         December 31, 1997                                           0.421              0.720           0.421           0.760
BOOK VALUE
As of:
         December 31, 1999                                            8.91              11.03            7.89           14.24
         December 31, 1998                                            9.45              12.21            8.84           15.96
TANGIBLE BOOK VALUE
As of:
         December 31, 1999                                            8.43              10.84            7.50           13.54
         December 31, 1998                                            8.90              12.01            8.39           15.14
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                       26

<PAGE>


                           THE STOCKHOLDERS' MEETINGS


                             THE NBT ANNUAL MEETING

WHEN AND WHERE THE NBT ANNUAL MEETING WILL BE HELD

     NBT will hold an annual meeting of  stockholders  at the Holiday Inn Arena,
2-8 Hawley  Street,  Binghamton,  New York on May 16, 2000,  at 2:00 p.m.  local
time.

WHAT WILL BE VOTED ON AT THE NBT ANNUAL MEETING

     o    In  connection  with the election of  directors,  to fix the number of
          directors at twelve and elect the candidates listed as nominees in the
          joint proxy statement/prospectus.

     o    To  ratify  the NBT  Board's  action  in  selecting  KPMG LLP as NBT's
          independent auditor for the year 2000.

     o    To approve the NBT Employee Stock Purchase Plan.

     o    To  consider  and vote upon the  issuance  of NBT common  stock in the
          merger and  ratification of the merger  agreement,  which will approve
          the  merger  and   related   actions,   including   the   issuance  of
          approximately 5.2 million shares of NBT common stock to the holders of
          Pioneer American common stock upon completion of the merger.

     o    To transact  such other  business as may properly  come before the NBT
          annual meeting.

     We may take  action on the above  matters at the NBT annual  meeting on May
16,  2000,  or on any later date to which the annual  meeting  is  postponed  or
adjourned.

     The NBT Board is unaware of other  matters to be voted on at the NBT annual
meeting.  If other  matters do  properly  come  before  the NBT annual  meeting,
including  consideration  of a motion to adjourn  the annual  meeting to another
time and/or place for such purpose of soliciting additional proxies, NBT intends
that  the  persons  named  in the  proxies  will  vote,  or not  vote,  in their
discretion the shares represented by proxies in the accompanying form. The named
agents will not vote any proxy voted against approval of the merger agreement in
favor of any  adjournment  or  postponement  of the NBT annual  meeting  for the
purpose of soliciting additional proxies.

STOCKHOLDERS ENTITLED TO VOTE

     NBT has set  April  3,  2000 as the  record  date to  determine  which  NBT
stockholders  will be  entitled  to vote at the NBT  annual  meeting.  Only  NBT
stockholders  who held  their  shares of record as of the close of  business  on
April 3, 2000,  will be  entitled  to  receive  notice of and to vote at the NBT
annual  meeting.  As of February 29,  2000,  there were  18,100,868  outstanding
shares of NBT common stock.  Each NBT stockholder on the record date is entitled
to one vote per share,  which the  stockholder  may cast  either in person or by
properly  executed proxy.  NBT's  Certificate of  Incorporation  does not permit
stockholders  to cumulate their votes in the election of directors.  At February
29, 2000, NBT's 401(k) and Employee Stock Ownership Plan owned of record 907,748
shares of NBT's  common  stock on behalf of the plan's  employee  beneficiaries,
representing 5.01% of the outstanding shares of NBT's common stock.

VOTE REQUIRED TO APPROVE THE PROPOSALS

     The  affirmative  vote,  either in person or by proxy, of a majority of the
NBT shares  represented and voting and entitled to vote at the annual meeting is
required to:

     o    ratify the NBT Board's selection of NBT's independent auditor;

                                       27

<PAGE>


     o    approve the NBT Employee Stock Purchase Plan;

     o    issue NBT common stock in the merger;

     o    ratify the merger agreement and related matters; and

     o    set the number of directors at twelve.

     The affirmative  vote,  either in person or by proxy, of a plurality of the
shares of NBT  common  stock  represented  and voting  and  entitled  to vote is
required to:

     o    elect the NBT nominees for director.

     Abstentions  on any proposal will  effectively  count as votes against that
proposal.  Broker  non-votes will not affect the vote on any of the proposals to
be presented  at the NBT annual  meeting.  Accordingly,  the NBT Board urges NBT
stockholders  to complete,  date and sign the  accompanying  proxy and return it
promptly in the enclosed postage-paid envelope.

NUMBER OF SHARES THAT MUST BE REPRESENTED FOR A VOTE TO BE TAKEN

     In order to have a quorum,  a  majority  of the total  voting  power of the
outstanding  shares of NBT's  common  stock  entitled  to vote at the NBT annual
meeting must be represented in person or by proxy.

VOTING YOUR SHARES

     The NBT Board is soliciting  proxies from NBT stockholders.  This will give
you an opportunity to vote at the NBT annual  meeting.  When you deliver a valid
proxy,  the shares  represented  by that proxy will be voted in accordance  with
your  instructions  by a named agent.  If you do not vote by proxy or attend the
annual meeting and vote in person, your votes will be counted as not present for
quorum  purposes but otherwise will have no effect upon the proposals  presented
at the annual meeting.  If you vote by proxy but make no  specification  on your
proxy card that you have otherwise properly executed, the named agent will vote

     o    FOR fixing the number of  directors at twelve and electing the persons
          nominated by the NBT Board as directors,

     o    FOR  ratification  of the NBT Board's  selection  of KPMG LLP as NBT's
          independent auditor for 2000,

     o    FOR approval of the NBT Employee Stock Purchase Plan, and

     o    FOR  approval of the  issuance  of NBT common  stock in the merger and
          ratification of the merger agreement and related matters.

     You may grant a proxy by dating,  signing and mailing your proxy card.  You
may also cast your vote in person at the meeting.

     Mail.  To grant your  proxy by mail,  please  complete  your proxy card and
sign, date and return it in the enclosed envelope. To be valid, a returned proxy
card must be signed and dated.

     In person.  If you attend  the NBT annual  meeting in person,  you may vote
your shares by completing a ballot at the meeting.

                                       28

<PAGE>


HOW PROXIES ARE COUNTED

     We will  count  as  present  at the NBT  annual  meeting  for  purposes  of
determining  the presence or absence of a quorum for the transaction of business
at the NBT annual meeting

     o    those  shares of NBT common  stock held by persons  attending  the NBT
          annual meeting but not voting, and

     o    those shares of NBT common  stock for which NBT has  received  proxies
          but with respect to which holders of those shares have  abstained from
          voting.

     Nasdaq  rules  prohibit  brokers  who hold  shares of NBT  common  stock in
nominee or "street name" for customers  who are the  beneficial  owners of those
shares from giving a proxy to vote  shares held for those  customers  on all the
matters to be  considered  and voted upon at the NBT annual  meeting  other than
election of directors  without specific  instructions  from those customers.  We
will count these so-called "broker non-votes," which we receive, for purposes of
determining whether a quorum exists.

CHANGING YOUR VOTE

     Any NBT stockholder  giving a proxy may revoke the proxy at any time before
the vote at the annual meeting in one or more of the following ways:

     o    delivering  a written  notice to the Chief  Executive  Officer  of NBT
          bearing a later date than the proxy;

     o    granting a later-dated proxy; or

     o    appearing in person and voting at the NBT annual  meeting.  Attendance
          at the NBT annual  meeting will not by itself  constitute a revocation
          of a proxy, unless you complete a ballot.

     You should send any written notice of revocation or subsequent  proxy to 52
South Broad Street, Norwich, New York 13815, Attention: Chief Executive Officer,
or hand  deliver  the  notice of  revocation  or  subsequent  proxy to the Chief
Executive Officer at or before the taking of the vote at the NBT annual meeting.

INDEPENDENT AUDITORS TO BE PRESENT AT THE ANNUAL MEETING

     Representatives  of KPMG LLP, NBT's current  independent  auditor,  will be
present  at the NBT  annual  meeting  and will  have the  opportunity  to make a
statement if they desire to do so. Such  representatives  will also be available
to respond to appropriate questions.

SOLICITATION OF PROXIES AND COSTS

     NBT will bear its own costs of solicitation of proxies.  NBT will reimburse
brokerage  houses,  fiduciaries,  nominees  and others  for their  out-of-pocket
expenses in forwarding  proxy  materials to owners of shares of NBT common stock
held in their names.  In addition to the  solicitation  of proxies by use of the
mails, NBT may solicit proxies from NBT stockholders by directors,  officers and
employees  acting  on  behalf  of  NBT in  person  or by  telephone,  telegraph,
facsimile or other  appropriate  means of  communications.  NBT will not pay any
additional  compensation,  except for reimbursement of reasonable  out-of-pocket
expenses,  to these directors,  officers and employees of NBT in connection with
the  solicitation.  You may direct any  questions  or  requests  for  assistance
regarding this joint proxy  statement/prospectus  and related proxy materials to
Michael J.  Chewens,  Executive  Vice  President  of NBT, by  telephone at (607)
337-6520.

                                       29

<PAGE>


     REGARDLESS  OF THE NUMBER OF SHARES YOU OWN, YOUR VOTE IS IMPORTANT TO NBT.
PLEASE COMPLETE,  SIGN, DATE AND PROMPTLY RETURN THE ACCOMPANYING  PROXY CARD IN
THE ENCLOSED POSTAGE-PAID ENVELOPE.

RECOMMENDATIONS OF NBT BOARD

     The NBT Board has  unanimously  approved  the fixing of the size of the NBT
Board at twelve  members and the  nomination  of the persons named in this joint
proxy  statement/prospectus  for the NBT Board and  selecting  KPMG LLP as NBT's
independent  auditor for 2000.  The NBT Board  believes that each proposal is in
the best interest of NBT and the NBT  stockholders  and recommends  that the NBT
stockholders vote FOR approval of each proposal.  See "Proposal 1 -- Election of
Directors,"  "Proposal 2 -- Proposal to Ratify the Board of Directors  Action in
Selection of KPMG LLP as NBT's Independent  Auditor" and "Proposal 3 -- Approval
of the NBT Employee Stock Purchase Plan."

     The NBT Board has unanimously  approved issuance of the NBT common stock in
the merger and the  merger  agreement  and the  related  matters.  The NBT Board
believes  that  issuance  of the NBT  common  stock in the merger and the merger
agreement  and  the  merger  are in  the  best  interests  of NBT  and  the  NBT
stockholders,  and recommends that the NBT stockholders vote FOR approval of the
issuance of the NBT common  stock in the merger and  ratification  of the merger
agreement. See "Proposal 4 -- The Issuance of NBT Common Stock in the Merger and
Ratification  of the Merger  Agreement" and "The Issuance of NBT Common Stock in
the Merger and Ratification of the Merger Agreement -- Recommendation of the NBT
Board and NBT's Reasons for the Merger."

                      THE PIONEER AMERICAN SPECIAL MEETING

WHEN AND WHERE THE PIONEER AMERICAN SPECIAL MEETING WILL BE HELD

     Pioneer  American will hold a special meeting of stockholders at Heart Lake
Lodge, 1299 Heart Lake Road, Jermyn,  Pennsylvania on May 16, 2000 at 10:00 a.m.
local time.

WHAT WILL BE VOTED ON AT THE PIONEER AMERICAN SPECIAL MEETING

     o    To consider and approve the merger  agreement,  which will approve the
          merger and related matters, and

     o    To  transact  such other  business  as may  properly  come  before the
          Pioneer American special meeting.

     We may take  action on the above  matters at the Pioneer  American  special
meeting  on May 16,  2000,  or any later  date to which the  special  meeting is
postponed or adjourned.

     The Pioneer  American  Board is unaware of other  matters to be voted on at
the Pioneer American  special meeting.  If other matters do properly come before
the Pioneer  American special  meeting,  including  consideration of a motion to
adjourn the  special  meeting to another  time  and/or  place for the purpose of
soliciting  additional proxies,  Pioneer American intends that the persons named
in  the  proxies  will  vote,  or not  vote,  in  their  discretion  the  shares
represented by proxies in the accompanying  form. The named agents will not vote
any  proxy  voted  against  approval  of the  merger  agreement  in favor of any
adjournment or  postponement  of the Pioneer  American  special  meeting for the
purpose of soliciting additional proxies.

STOCKHOLDERS ENTITLED TO VOTE

     Pioneer  American  has set March 24, 2000 as the record  date to  determine
which  Pioneer  American  stockholders  will be  entitled to vote at the Pioneer
American  special meeting.  Only Pioneer  American  stockholders at the close of
business on March 24, 2000, will be entitled to receive notice of and to vote at
the Pioneer American

                                       30

<PAGE>


special  meeting.  As of December  31,  1999,  there were  2,864,307  issued and
outstanding  shares of Pioneer  American  common  stock.  Each Pioneer  American
stockholder  on the record date is entitled to one vote per share,  and may cast
such votes either in person or by properly executed proxy.

VOTE REQUIRED TO APPROVE THE MERGER

     APPROVAL  OF  THE  MERGER   AGREEMENT  AND  RELATED  MATTERS  REQUIRES  THE
AFFIRMATIVE  VOTE OF  SEVENTY  PERCENT  OF THE  OUTSTANDING  SHARES  OF  PIONEER
AMERICAN COMMON STOCK ENTITLED TO VOTE AT THE PIONEER  AMERICAN SPECIAL MEETING.
ABSTENTIONS  AND BROKER  NON-VOTES  WILL HAVE THE SAME  EFFECT AS VOTES  AGAINST
APPROVAL OF THE MERGER  AGREEMENT  AND THE  RELATED  MATTERS.  ACCORDINGLY,  THE
PIONEER AMERICAN BOARD URGES PIONEER AMERICAN STOCKHOLDERS TO COMPLETE, DATE AND
SIGN THE ACCOMPANYING PROXY AND RETURN IT PROMPTLY IN THE ENCLOSED  POSTAGE-PAID
ENVELOPE.

NUMBER OF SHARES THAT MUST BE REPRESENTED FOR A VOTE TO BE TAKEN

     In order to have a quorum,  a  majority  of the total  voting  power of the
outstanding  shares of Pioneer  American's  common stock entitled to vote at the
Pioneer American special meeting must be represented in person or by proxy.

VOTING YOUR SHARES

     The Pioneer American Board is soliciting  proxies from the Pioneer American
stockholders.  This will give you an opportunity to vote at the Pioneer American
special meeting.  When you deliver a valid proxy, the shares represented by that
proxy will be voted in accordance  with your  instructions  by a named agent. If
you do not vote by proxy or attend the Pioneer American special meeting and vote
in person,  it will have the same effect as voting  against  the merger.  If you
vote by  proxy  but  make no  specification  on your  proxy  card  that you have
otherwise properly executed,  the agent will vote the shares FOR approval of the
merger agreement and related matters.

HOW PROXIES ARE COUNTED

     We will count as present at the Pioneer  American  meeting for  purposes of
determining  the presence or absence of a quorum for the transaction of business
at the Pioneer American special meeting

     o    those  shares  of  Pioneer  American  common  stock  held  by  persons
          attending the Pioneer American special meeting but not voting, and

     o    shares of Pioneer American common stock for which Pioneer American has
          received  proxies but with  respect to which  holders of those  shares
          have abstained from voting.

     Nasdaq rules prohibit  brokers who hold shares of Pioneer  American  common
stock in nominee or "street name" for customers who are the beneficial owners of
those shares from giving a proxy to vote shares held for those  customers on the
matters to be considered and voted upon at the Pioneer  American meeting without
specific  instructions  from  those  customers.  We will  count  these so called
"broker  non-votes,"  which we receive,  for purposes of  determining  whether a
quorum exists.

CHANGING YOUR VOTE

     Any Pioneer  American  stockholder  may revoke the proxy at any time before
the vote at the meeting in one or more of the following ways:

     o    delivering a written notice to the Chief Executive  Officer of Pioneer
          American bearing a later date than the proxy;

                                       31

<PAGE>


     o    granting a later-dated proxy;

     o    appearing  in person  and  voting at the  meeting.  Attendance  at the
          Pioneer  American  special  meeting  will not by itself  constitute  a
          revocation of a proxy, unless you complete a ballot.

     You should send any written  notice of revocation  or  subsequent  proxy to
Pioneer  American  Holding  Company  Corp.,  41 North Main  Street,  Carbondale,
Pennsylvania  18407,  Attention:  Chief Executive  Officer,  or hand deliver the
notice of  revocation  or  subsequent  proxy to the Chief  Executive  Officer of
Pioneer  American  at or before the taking of the vote at the  Pioneer  American
special meeting.

INDEPENDENT AUDITORS TO BE PRESENT AT THE SPECIAL MEETING

     KPMG  LLP is  Pioneer  American's  independent  auditor.  Pioneer  American
expects  representatives  of KPMG  LLP to be  present  at the  Pioneer  American
special  meeting and to have the  opportunity to make a statement if they desire
to do so. Pioneer American also expects such  representatives  of KPMG LLP to be
available to respond to appropriate questions.

SOLICITATION OF PROXIES AND COSTS

     Pioneer  American  will  bear its own  costs of  solicitation  of  proxies.
Pioneer  American will make  arrangements  with  brokerage  houses,  custodians,
nominees and  fiduciaries  for  forwarding  of proxy  solicitation  materials to
beneficial owners of shares held of record by such brokerage houses, custodians,
nominees and  fiduciaries,  and Pioneer  American will  reimburse such brokerage
houses,  custodians,  nominees and  fiduciaries  for their  reasonable  expenses
incurred in connection with the solicitation. In addition to solicitation by use
of  the  mails,   Pioneer   American  may  solicit  from  the  Pioneer  American
stockholders  by directors,  officers and employees  acting on behalf of Pioneer
American  in person or by  telephone,  telegraph,  facsimile  or other  means of
communications.  Pioneer  American will not compensate such directors,  officers
and employees but may reimburse  them for reasonable  out-of-pocket  expenses in
connection  with  such  solicitation.  Further,  Pioneer  American  has  engaged
Mackenzie  Partners,  Inc., a solicitor and advisor, to solicit proxies from the
Pioneer  American  stockholders  on behalf of Pioneer  American  in person or by
telephone,  telegraph,  facsimile,  or other  means of  communications.  Pioneer
American will compensate Mackenzie Partners,  Inc. $5,500 and reimburse them for
reasonable out-of- pocket expenses in connection with the solicitation.  You may
direct any  questions  or requests  for  assistance  regarding  this joint proxy
statement/prospectus  and related  proxy  materials  to Patricia A. Cobb,  Esq.,
Executive Vice President of Pioneer American, by telephone at (570) 282-8045.

     REGARDLESS  OF THE  NUMBER OF SHARES  YOU OWN,  YOUR VOTE IS  IMPORTANT  TO
PIONEER  AMERICAN.   PLEASE  COMPLETE,   SIGN,  DATE  AND  PROMPTLY  RETURN  THE
ACCOMPANYING PROXY CARD IN THE ENCLOSED POSTAGE-PAID ENVELOPE.

RECOMMENDATION OF PIONEER AMERICAN BOARD

     The Pioneer  American Board has unanimously  approved the merger  agreement
and the related  matters.  The Pioneer  American  Board believes that the merger
agreement,  the merger and related  matters are in the best interests of Pioneer
American and the Pioneer American stockholders,  and recommends that the Pioneer
American  stockholders vote FOR approval of the merger agreement and the related
matters. See "The Issuance of NBT Common Stock in the Merger and Ratification of
the Merger Agreement -- Recommendation of the Pioneer American Board and Pioneer
American's Reasons for the Merger."

                                       32

<PAGE>


                                   PROPOSAL 1
                           (ONLY STOCKHOLDERS OF NBT)

                              ELECTION OF DIRECTORS

     The NBT bylaws  provide  that the number of directors  authorized  to serve
until the next annual meeting of stockholders  shall be the number designated at
the  NBT  annual  meeting  and  prior  to  the  election  of  directors  by  the
stockholders entitled to vote for the election of directors at that meeting. The
NBT Board has proposed and is  requesting  the NBT  stockholders  to approve its
proposal  that the  number  of  directors  be set at  twelve.  The NBT Board has
designated six persons as nominees for election at the NBT annual meeting and is
presenting these nominees to the NBT stockholders for election. The directors to
be elected at the annual  meeting shall be determined by a plurality vote of the
shares of NBT common stock  represented in person or by proxy,  entitled to vote
on the election of directors.

     In  addition,  at the  effective  time of the  merger,  the NBT  Board,  in
accordance with the merger  agreement,  will expand from twelve to fifteen,  and
three  individuals who are currently  serving as directors of Pioneer  American,
Messrs.  Gene E.  Goldenziel,  Richard  Chojnowski,  and Joseph G. Nasser,  will
become  directors  of NBT.  Mr.  Goldenziel  will become a director of the class
whose term expires in 2001; Mr.  Chojnowski  will become a director of the class
whose term expires in 2002;  and Mr.  Nasser will become a director of the class
whose term expires in 2003.

     Nominations  of candidates for election as directors of NBT must be made in
writing and  delivered  to or received by the  President  of NBT within ten days
following the day on which public  disclosure  of the date of any  stockholders'
meeting called for the election of directors is first given.  Such  notification
must  contain  the name and  address  of the  proposed  nominee,  the  principal
occupation  of the  proposed  nominee,  the number of shares of NBT common stock
that the notifying  stockholder  will vote for the proposed  nominee,  including
shares  to  be  voted  by  proxy,  the  name  and  residence  of  the  notifying
stockholder,  and the number of shares of NBT common stock beneficially owned by
the notifying stockholder.

     No person  except Mr.  Everett A. Gilmour shall be eligible for election or
re-election  as a director if he or she shall have  attained  the age of 72. Mr.
Gilmour  shall not be eligible  for  election or  re-election  as director if he
shall have attained the age of 78.

     The chairman of the NBT annual  meeting may  disregard any  nomination  not
made in accordance with the procedures established by the NBT bylaws.

     The NBT  bylaws  permit the NBT Board by a majority  vote,  between  annual
meetings of the  stockholders,  to increase  the number of directors by not more
than three  members  and to  appoint  qualified  persons  to fill the  vacancies
created by the Board's actions.

     The NBT bylaws provide for a classified  Board of Directors.  The NBT Board
is divided into three equal classes. Each class holds office for a term of three
years, but only one class comes up for election each year (except in those cases
where vacancies occur in other classes).  The NBT Board is proposing as nominees
for directors the persons named below as follows:

     o    four for the three-year term expiring at the annual meeting to be held
          in 2003;

     o    one for the three-year  term expiring at the annual meeting to be held
          in 2002;

     o    one for the three-year  term expiring at the annual meeting to be held
          in 2001;

and in each case until their successors are elected and qualify.

                                       33

<PAGE>


     The persons  named in the  enclosed  proxy intend to vote the shares of NBT
common stock represented by each respective proxy properly executed and returned
to NBT for such nominees for election as directors,  but if the nominees  should
be unable to serve, they will vote such proxies for such substitute  nominees as
the NBT Board shall designate to replace such nominees.  The NBT Board currently
believes that each nominee is available for election.  The names of the nominees
for  election for the term as shown and certain  information  as to each of them
are as follows:

<TABLE>
<CAPTION>
                                                                                                  Number of
                                                 Principal Occupation During                      Common Shares          Percent
                                    Date         Past Five Years and Other          Director      Beneficially Owned     of Shares
Name                                of Birth     Directorships (a)                  Since         on 12/31/99 (b)        Outstanding
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                 <C>          <C>                                <C>           <C>                        <C>

NOMINEES WITH TERMS EXPIRING IN 2003:

Andrew S. Kowalczyk, Jr.            09/27/35     Partner - Kowalczyk, Tolles,       1994            3,721(1)                   *
                                                 Deery & Johnston, attorneys
                                                 Director of NBT Bank
                                                  since 1994

Dan B. Marshman                     05/08/46     Partner, Marshman Farms, Inc.      1999           24,935(1)                   0.20%
                                                 Directorships:                                     1,359(1)(b)                *
                                                  North Country Insurance Co.                       4,003(2)                   *
                                                  NBT Bank since 1995                               1,203(2)(b)                *



John G. Martines                    11/09/46     President of LA Bank and CEO       2000           19,049(1)                   (i)
                                                  Lake Ariel for more than 5 years                113,358(2)
                                                                                                   14,046(2)(b)

John C. Mitchell                    05/07/50     President and CEO of               1994           10,712(1)                   *
                                                  I.L. Richer Co.
                                                  (agri. business)
                                                 Directorships:
                                                  Preferred Mutual Ins. Co.(c);
                                                  NBT Bank since 1993

NOMINEE WITH TERM EXPIRING IN 2002:

Bruce D. Howe                       11/22/31     President of Lake Ariel and        2000          219,049(1)                   (i)
                                                  Chairman of subsidiaries for                    126,187(2)
                                                  more than 5 years; President of
                                                  John T. Howe, Inc. (fuel and
                                                  heating oil company), a motel,
                                                  truck stop, and convenience
                                                  stores

NOMINEE WITH TERM EXPIRING IN 2001:

William C. Gumble                   12/08/37     Retired attorney-at-law; County    2000          119,233(1)                   (i)
                                                  Solicitor and District Attorney
                                                  of Pike County, PA
</TABLE>


                                       34


<PAGE>

<TABLE>
<CAPTION>
                                                                                                  Number of
                                                 Principal Occupation During                      Common Shares          Percent
                                    Date         Past Five Years and Other          Director      Beneficially Owned     of Shares
Name                                of Birth     Directorships (a)                  Since         on 12/31/99 (b)        Outstanding
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                 <C>          <C>                                <C>           <C>                        <C>

CONTINUING DIRECTORS WITH TERMS EXPIRING IN 2002:

J. Peter Chaplin                    10/27/29     Senior Vice President (Retired)    1999           21,357(1)                   0.17%
                                                  Sheffield Products/Quest Intl.                    3,536(2)(b)                *
                                                 Directorships:
                                                  Director of NBT Bank
                                                  since 1995

Peter B. Gregory                    05/07/35     Partner, Gatehouse Antiques        1987          113,210(1)                   0.91%
                                                 Director of NBT Bank                               7,957(1)(b)                *
                                                  since 1978                                       25,787(2)(b)                0.21%


Paul O. Stillman                    01/15/33     Chairman of Preferred              1986           27,692(1)                   0.22%
                                                 Mutual Ins. Co. (c)                                  724(2)(b)                *
                                                 Directorships:
                                                  Preferred Mutual Ins. Co. (c);
                                                  Leatherstocking Cooperative
                                                   Ins. Co;
                                                  NBT Bank since 1977

CONTINUING DIRECTORS WITH TERMS EXPIRING IN 2001:

Daryl R. Forsythe                   08/02/43     President and CEO of NBT           1992           31,825(1)                   0.26%
                                                  since January 1995; Chairman                      1,436(1)(b)                *
                                                  and CEO of NBT Bank since                         7,347(2)                   *
                                                  September 1999; President and                     1,511(2)(b)                *
                                                  CEO of NBT Bank from                            148,818(3)                   1.20%
                                                  January 1995 to September;
                                                  1999; Vice President &
                                                  General Manager of Simmonds
                                                  Precision Engine Systems, a
                                                  subsidiary of BF Goodrich
                                                  Aerospace for more than 7 previous
                                                  years
                                                 Directorships:
                                                  Security Mutual Life Ins. Co. of NY;
                                                  NBT Bank since 1988

Everett A. Gilmour                  05/22/21     Chairman of NBT since              1986           94,840(1)                   0.76%
                                                  January 1995; Chairman of NBT                     5,016(2)                   *
                                                  Bank from January 1995 to                         3,047(2)(b)                *
                                                  September 1999; Retired
                                                  Chairman of NBT for more
                                                  than 5 previous years
                                                 Directorships:
                                                  Preferred Mutual Ins. Co.(c);
                                                  NBT Bank since 1962

William L. Owens                    01/20/49     Managing Partner, Stafford,        1999            2,480(1)                   *
                                                  Trombley, Owens & Curtin,
                                                  P.C., attorneys
                                                 Directorships:
                                                  Champlain Enterprises, Inc.
                                                  Prim Hall Enterprises
                                                  Mediquest, Inc.
                                                  NBT Bank since 1995
</TABLE>


                                       35

<PAGE>
                     EXECUTIVE OFFICERS OF NBT BANCORP INC.
                      OTHER THAN DIRECTORS WHO ARE OFFICERS

<TABLE>
<CAPTION>
                                                                                               Number of
                                                      Present Position                         Common Shares             Percent
                                         Date of      and Principal                            Beneficially Owned        of Shares
Name                   Date of Birth     Employment   Position Last Five Years                 on 12/31/99(b)            Outstanding
- ----                   -------------     ----------   ------------------------                 --------------            -----------
<S>                    <C>               <C>          <C>                                          <C>                    <C>
Michael J. Chewens     9/13/61           7/18/94      Executive Vice President, Chief               1,041(1)               *
                                                       Financial Officer and Treasurer              1,117(1)(b)            *
                                                       of NBT and NBT Bank since                   24,362(3)               0.20%
                                                       September 1999; Senior Vice
                                                       President Control Group, 1995-1999;
                                                       Vice President and Auditor, 1994-1995;
                                                       Senior Manager, KPMG Peat
                                                       Marwick, 1984-1994

Martin A. Dietrich     4/3/55            3/1/81       President and Chief Operating                 6,936(1)               *
                                                       Officer of NBT Bank since September          5,545(1)(b)            *
                                                       1999; Executive Vice President of            3,288(2)               *
                                                       Retail Banking 1998-1999; Senior               848(2)(b)            *
                                                       Vice President of Retail Banking            44,457(3)               0.36%
                                                       1996-1998;  Senior Vice President
                                                       and Chief Credit Officer
                                                       1995 - 1996; Regional
                                                       Manager 1993 - 1995;
                                                       Director of Marketing
                                                       1991 - 1993

Joe C. Minor           10/7/42           3/1/93       President and Chief Operating Officer         4,706(1)               *
                                                       of NBT Financial Services, Inc.              2,374(1)(b)            *
                                                       since September 1999; Chief                 43,579(3)               0.35%
                                                       Financial Officer and Treasurer
                                                       of NBT 1995-1999; Executive Vice
                                                       President, Chief
                                                       Financial Officer,
                                                       Treasurer and Cashier of
                                                       NBT Bank 1995-1999;
                                                       Senior Vice President and
                                                       Controller of NBT Bank,
                                                       1993-1995; Owner, Public
                                                       Accounting/Bank
                                                       Consulting Firm,
                                                       Charlotte, NC 1983-1993

John D. Roberts        2/16/40           2/15/65      Vice President and Secretary of              19,988(1)               0.16%
                                                       NBT since September 1995;                    1,692(1)(b)            *
                                                       Executive Vice President and                   306(2)(b)            *
                                                       Chief Trust Officer of NBT Bank             39,125(3)               0.31%
                                                       since 1998; Senior Vice President
                                                       and Chief Trust Officer of NBT Bank
                                                       1995-1998; Executive Vice President
                                                       Chenango Mutual Insurance Co.
                                                       1989 - 1995
</TABLE>

                                       36
<PAGE>


     All directors and executive  officers as a group beneficially owned 741,880
shares  as of  December  31,  1999,  which  represented  5.66% of  total  shares
outstanding,  including shares owned by spouses and minor children,  as to which
beneficial  ownership is disclaimed,  and options exercisable within sixty days.
Following the merger of NBT and Lake Ariel, the directors and executive officers
of NBT owned a total of 1,373,112  shares of NBT common  stock or  approximately
7.59% of the 18,100,868 outstanding shares of NBT common stock.

NOTES:
(a)  The business  experience  of each  director  during the past five years was
     that typical to a person  engaged in the  principal  occupation  listed for
     each.
(b)  The  information  under this caption  regarding  ownership of securities is
     based upon statements by the individual nominees,  directors,  and officers
     and includes  shares held in the names of spouses and minor  children as to
     which  beneficial  ownership is disclaimed.  These  indirectly  held shares
     total in number 58,440 for the spouses and for minor children.  In the case
     of officers and officer directors,  shares of NBT's stock held in NBT Bank,
     National Association Employee Stock Ownership Plan as of December 31, 1999,
     are included.
(c)  Preferred Mutual Insurance  Company,  of which Paul O. Stillman is Chairman
     and Director,  and Everett A. Gilmour and John C.  Mitchell are  Directors,
     owns 128,041 shares; Messrs.  Stillman,  Gilmour, and Mitchell disclaim any
     beneficial ownership of any such shares.
(d)  The North  Country  Insurance  Company of which Mr.  Marshman is a director
     owns 18,516 shares. Mr. Marshman disclaims any beneficial  ownership of any
     such shares.
(e)  The  Everett & Pearl  Gilmour  Foundation,  of which  Everett  Gilmour is a
     Director,   owns  10,288  shares.  Mr.  Gilmour  disclaims  any  beneficial
     ownership of any such shares.
(f)  The Phyllis A. & Daryl R. Forsythe  Foundation,  of which Daryl R. Forsythe
     is a Director,  owns 7,180 shares.  Mr.  Forsythe  disclaims any beneficial
     ownership of any such shares.
(g)  Mr.  Dietrich has power of attorney for his mother,  who owns 7,000 shares.
     Mr. Dietrich disclaims any beneficial ownership of any such shares.
(h)  Mr.  Mitchell is co-trustee for the trust u/w of I Richer  Mitchell,  which
     owns 17,158 shares. Mr. Mitchell disclaims any beneficial  ownership of any
     such shares.
(i)  Following the merger of NBT and Lake Ariel, the NBT Board appointed Messrs.
     Martines,  Howe and  Gumble  as  Directors  of NBT to serve  until the next
     annual  meeting  of  stockholders  of NBT.  The date with  respect to their
     respective ownership of NBT stock is February 29, 2000.
(1)  Sole voting and investment authority.
(2)  Shared voting and investment authority.
(3)  Shares  under  option from NBT  Bancorp  Inc.  Stock  Option Plan which are
     exercisable within sixty days of December 31, 1999.
*    Less than .1%

     On January 3, 1997, Mr. Martines  voluntarily entered into a consent decree
with respect to a complaint  filed by the SEC in connection with the purchase by
Mr. Martines of securities of First Eastern  Corporation ("First Eastern") prior
to the  announcement  by PNC Bank Corp.  ("PNC") that PNC would  purchase  First
Eastern. The complaint alleged that Mr. Martines purchased such securities based
upon information given to him by a director of First Eastern.  In order to avoid
the costs of pursuing a successful  defense and upon advice of his counsel,  Mr.
Martines  agreed to enter into such consent decree without  admitting or denying
any of the allegations in the SEC's  complaint.  The Lake Ariel Board considered
this matter and concluded that this action by Mr.  Martines had no effect on his
ability to  successfully  manage  Lake Ariel and LA Bank and had no  detrimental
effect on the short-term and long-term prospects of Lake Ariel and LA Bank.

     The NBT  Board  unanimously  recommends  the NBT  stockholders  to vote FOR
fixing the number of directors  at twelve and electing the nominees  selected by
the NBT Board and named in the preceding  table.  The named agents will vote the
proxies  FOR  fixing  the size of the NBT Board and FOR the named  nominees  for
director unless stockholders specify otherwise in their proxies.


                   BOARD MEETINGS AND COMMITTEES OF THE BOARD

     During  1999,  there were seven  meetings  of the NBT  Board.  Each  member
attended at least 75% of the meetings of the Board and those committees on which
he served. The full Board performed the duties of the Executive  Committee.  The
following committees perform a dual role for NBT and NBT Bank.

NOMINATING, ORGANIZATION AND BOARD AFFAIRS COMMITTEE:

         Chairman:         Daryl R. Forsythe

         Members:          Andrew S. Kowalczyk, Jr.
                           Dr. Peter B. Gregory
                           Everett A. Gilmour
                           J. Peter Chaplin
                           Paul O. Stillman
                           Martin A. Dietrich

     This committee,  which met three times during 1999, nominates directors for
election  for NBT and NBT  Bank.  The  committee  also  functions  to  insure  a
successful evolution of management at the senior level.

COMPENSATION AND BENEFITS COMMITTEE:

         Chairman:         Andrew S. Kowalczyk, Jr.

         Members:          Everett A. Gilmour
                           Dr. Peter B. Gregory
                           John C. Mitchell
                           Richard F. Monroe
                           Paul O. Stillman
                           William L. Owens

     This committee has the  responsibility  of reviewing the salaries and other
forms of  compensation  of the key executive  personnel of NBT and NBT Bank. The
committee  met three  times in 1999.  The  committee  administers  the NBT stock
option plan.

                                       37

<PAGE>


AUDIT, COMPLIANCE AND LOAN REVIEW COMMITTEE:

         Chairman:         Dan B. Marshman

         Members:          J. Peter Chaplin
                           Everett A. Gilmour
                           Janet H. Ingraham
                           John C. Mitchell
                           Plus 2 rotating members each year

     The Audit, Compliance and Loan Review Committee represents the NBT Board in
fulfilling  its  statutory  and  fiduciary   responsibilities   for  independent
examinations  of NBT including  monitoring  accounting  and financial  reporting
practices and financial information  distributed to stockholders and the general
public.  Further,  the committee  determines that NBT operates within prescribed
procedures in accordance  with adequate  administrative,  operating and internal
accounting controls. It also makes recommendations to the NBT Board with respect
to the  appointment  of  independent  auditors  for  the  following  year.  This
committee met four times in 1999.


             SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

     NBT  Directors  and  Executive  Officers  must,  under Section 16(a) of the
Securities  Exchange Act of 1934,  file certain reports of changes in beneficial
ownership  of NBT  securities.  NBT  Bank  endeavors  to  assist  Directors  and
Executive Officers in filing the required reports. To NBT's knowledge all filing
requirements under the Securities Exchange Act were satisfied.


                     COMPENSATION OF DIRECTORS AND OFFICERS

BOARD OF DIRECTORS FEES

     For 1999, members of the NBT Board received a $3,000 annual retainer in the
form of restricted stock and $600 per Board meeting attended.  NBT Board members
also  received  $600  for  each  committee  meeting  attended.  Chairmen  of the
committees  received $900 for each committee meeting attended.  Officers of NBT,
who are also  Directors,  do not receive any fees. For 2000,  members of the NBT
Board will continue to receive an annual  retainer in the amount of $3,000 which
will be payable  in the form of  restricted  stock  which will vest over a three
year period.

EXECUTIVE COMPENSATION

     The following table sets forth  information  concerning the chief executive
officer of NBT and the four most highly compensated  executive  officers,  other
than the  chief  executive  officer,  of NBT or NBT Bank  who  were  serving  as
executive  officers at the end of 1999 and whose total  annual  salary and bonus
exceeded $100,000 in 1999.


                                       38

<PAGE>
                           SUMMARY COMPENSATION TABLE
<TABLE>
<CAPTION>
                                                                                    Long Term Compensation
                                       Annual Compensation        Awards            Payouts
                                       -------------------        ------            ----------------------
                                                                                                 Securities
Name and                                                       Other Annual         LTIP         Underlying         All Other
Principal Position              Year    Salary    Bonus(1)     Compensation(2)      Payouts      Options (3)        Compensation(4)
- ------------------              ----    ------    --------     ---------------      -------      -----------        ---------------
<S>                             <C>     <C>       <C>                               <C>          <C>                <C>
Daryl R. Forsythe,              1999    $300,000  $200,000                          $-0-         46,935             $312,780
  President and Chief           1998     311,539   195,000                           -0-         39,339               28,337
  Executive Officer of          1997     280,000   168,000                           -0-         45,863               31,798
  NBT

Joe C. Minor,                   1999     197,961   155,000                           -0-         16,485              171,244
  President and Chief           1998     168,461    68,000                           -0-         13,719               14,400
  Operating Officer of          1997     125,000    55,400                           -0-         12,789               14,400
  NBT Financial Services
   Corp.

Michael J. Chewens, (5)         1999     113,846    65,000                           -0-          9,660              112,508
  Executive Vice President,     1998      98,236    40,000                           -0-          9,261               12,000
  Chief Financial Officer       1997      86,538    35,540                           -0-          8,952                8,727
  and Treasurer of NBT
  and NBT Bank

Martin A. Dietrich,             1999     184,231   155,000                           -0-         15,540               15,009
 President  and Chief           1998     137,693    63,744                           -0-         12,039               14,400
  Operating Officer             1997     110,000    49,000                           -0-         11,318               12,992
  of NBT Bank

John D. Roberts,                1999     150,000    69,600                           -0-         14,595               14,400
  Executive Vice President      1998     128,846    59,400                           -0-         11,340               14,400
  Chief Trust Officer of        1997     103,000    45,000                           -0-         10,584               12,164
  NBT Bank and Vice
  President and Secretary
  of NBT
</TABLE>

NOTES:
(1)  Represents bonuses under NBT's Executive Incentive Compensation Plan earned
     in the specified year and paid in January of the following year.
(2)  Individual amounts, and in the aggregate, are immaterial.
(3)  Number of common stock option grants adjusted for the 5% stock dividends in
     December 1997, 1998, 1999, and the 33 1/3% stock dividend in 1998.
(4)  In  1999,  1998  and  1997 NBT  Bank  contributed  $487,384,  $478,473  and
     $424,302,  respectively,  to NBT Bank's  Employees'  Stock  Ownership  Plan
     ("ESOP"). With the 1999 contribution,  NBT Bank as trustee of the ESOP will
     purchase  shares of NBT common  stock at the fair market value on the dates
     of  purchase  and  will  allocate  these  shares  to  the  accounts  of the
     participants.  The amount shown includes the amount  allocated to the named
     executive.  An  individual's  maximum  compensation  eligible  for the ESOP
     contribution  is  $160,000.  Includes  payments by NBT with  respect to the
     death benefits  agreement  ($888 for Mr.  Forsythe),  disability  agreement
     ($7,734 for Mr.  Forsythe),  and matching  contributions by NBT or NBT Bank
     pursuant  to NBT's and NBT Bank's  Section  401(k)  retirement  plan in the
     amount of  $8,000,  ESOP  contribution  of  $6,400.  Includes  the value of
     personal  share of autos of $5,980,  $596,  and $609 for Messrs.  Forsythe,
     Minor and Dietrich,  respectively.  ESOP  contributions of $6,400,  $6,400,
     $6,154  and $6,400 and 401(k)  matching  contributions  of $8,000,  $8,000,
     $7,692  and $8,000  were made for  Messrs.  Minor,  Dietrich,  Chewens  and
     Roberts  respectively.  Options  exercised during the year had total values
     realized of $283,778,  $156,248 and $63,114 for Messrs. Forsythe, Minor and
     Chewens, respectively. Moving costs of $35,348 were paid for Mr. Chewens.
(5)  Became an executive  officer on September 1, 1999.  Prior to that date, Mr.
     Chewens  served as Senior Vice  President  of the Control  Group  Division,
     which encompasses the Audit,  Compliance,  Loan Review and Legal Disclosure
     Departments of NBT.

                                       39

<PAGE>

OPTION GRANTS INFORMATION

     The following table presents information concerning grants of stock options
made  during  1999  to each  of the  executive  officers  named  in the  Summary
Compensation  Table above.  All  information  has been adjusted for the December
1999 stock dividend. No gain to the optionees is possible without an increase in
stock price which will benefit all shareholders proportionately. These potential
realizable values are based solely on arbitrarily  assumed rates of appreciation
required  by  applicable  SEC  regulations.  Actual  gains,  if any,  on  option
exercises and common  stockholdings  are dependent on the future  performance of
NBT Bancorp Inc.  Common  Stock.  There can be no assurance  that the  potential
realizable values shown in this table will be achieved.

                        OPTION GRANTS IN LAST FISCAL YEAR

<TABLE>
<CAPTION>
                                                                                                      Potential Realizable Value
                                                                                                      at Assumed Annual Rates
                                                                                                      of Stock Price Appreciation
                                   Individual Grants                                                  for Option Term (2)
                           --------------------------------                                           -------------------
                           # of
                           Securities       % of Total
                           Underlying       Options Granted       Exercise
                           Options          to Employees          Price
         Name              Granted(1)       in Fiscal Year        ($/Sh)       Expiration Date           5%             10%
         ----              ----------       ---------------       --------     ---------------       ---------      ----------
<S>                        <C>              <C>                   <C>                  <C>           <C>            <C>
Daryl R. Forsythe          36,345           16.7%                 $20.59       January 2009          $471,797       $1,195,620
Daryl R. Forsythe          10,500(3)         4.8%                  20.44       April   2009           134,973          342,049
Joe C. Minor               16,485            7.5%                  20.59       January 2009           213,464          540,958
Michael J. Chewens          9,660            4.4%                  20.59       January 2009           125,087          316,994
John D. Roberts            14,595            6.7%                  20.59       January 2009           188,991          478,937
Martin A. Dietrich         15,540            7.1%                  20.59       January 2009           201,227          509,948
</TABLE>

NOTES:
(1)  Nonqualified  options have been granted at fair market value at the date of
     grant.  At the time of grant,  options  are 40% vested  after one year from
     grant date; an additional 20% vests each year thereafter.
(2)  The potential realizable value of each grant of options,  assuming that the
     market price of the underlying security  appreciates in value from the date
     of grant to the end of the option term, at the specified  annualized rates.
     The  assumed  growth  rates in price in  NBT's  stock  are not  necessarily
     indicative of actual performance that may be expected.  The amounts exclude
     the cost by the executive to exercise such options.
(3)  Options granted under reload feature on April 28, 1999.


AGGREGATE OPTION EXERCISES IN LAST FISCAL YEAR AND FISCAL YEAR-END OPTION VALUES

     The following table presents  information  concerning the exercise of stock
options  during  1999 by each of the  executive  officers  named in the  Summary
Compensation  Table above,  and the value at December 31, 1999,  of  unexercised
options that are  exercisable  within  sixty days of December  31,  1999.  These
values, unlike the amounts set forth in the column headed "Value Realized," have
not been, and may never be realized. All information has been adjusted for stock
dividends and splits.  The  underlying  options have not been, and may never be,
exercised; and actual gains, if any, on exercise will depend on the value of NBT
Bancorp Inc.  Common  Stock on the date of  exercise.  There can be no assurance
that these values will be realized.


                 AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR
                        AND FISCAL YEAR-END OPTION VALUES

<TABLE>
<CAPTION>
                                                                            Number of Securities        Value of Unexercised
                                                                            Underlying Unexercised      In the Money Options
                                                                            Options at FY End           at FY End(2)
                                                                            ----------------------      ------------

                           Shares Acquired                                  Exercisable/                Exercisable/
Name                       on Exercise           Value Realized(1)          Unexercisable               Unexercisable
- ----                       ----------------      -----------------          -------------               -------------
<S>                        <C>                   <C>                        <C>                         <C>
Daryl R. Forsythe          25,000                $283,778                   148,818/58,515              $540,009/37,177
Joe C. Minor               13,625                 156,248                    43,579/18,339               136,881/10,367
Michael J. Chewens          5,769                  63,114                    24,362/11,291                 69,186/6,911
John D. Roberts            -0-                    -0-                        39,125/15,743                130,865/8,580
Martin A. Dietrich         -0-                    -0-                        44,457/16,758                158,826/9,175
</TABLE>

NOTES:
(1)  Represents  difference  between  the fair  market  value of the  securities
     underlying the options and the exercise price of the options on the date of
     exercise.
(2)  Represents  difference  between  the fair  market  value of the  securities
     underlying  the options and the  exercise  price of the options at December
     31, 1999.

RETIREMENT PLAN

     The following table presents  information  with respect to the pension plan
of NBT and NBT Bank. The table shows the estimated  annual benefits payable upon
retirement in specified  compensation and years of service  classifications  for
participants retiring on December 31, 1999.

                                       40

<PAGE>


<TABLE>
<CAPTION>
                                                                      Years of Participation
                                          ---------------------------------------------------------------------------
Final Average
Earnings                                     10 Years            20 Years            30 Years             40 Years
- -------------                             -------------       -------------       --------------       --------------
<S>                   <C>                 <C>                 <C>                 <C>                  <C>
$15,000                N                  $    2,197.50       $    3,246.46       $     4,931.56       $     6,904.19
                       Q                       2,044.42            3,020.31             4,588.03             6,423.24

$25,000                N                       3,662.50            5,602.35             8,219.27            11,506.98
                       Q                       3,407.37            5,212.09             7,646.72            10,705.40

$40,000                N                       6,286.81            9,633.94            13,247.86            18,547.00
                       Q                       5,848.87            8,962.84            12,325.01            17,255.02

$70,000                N                      12,526.81           19,118.45            27,117.88            37,965.03
                       Q                      11,654.19           17,786.66            25,228.85            35,320.39

$100,000               N                      18,766.81           28,812.11            40,987.90            57,383.06
                       Q                      17,459.51           26,805.06            38,132.68            53,385.76

$200,000               N                      30,414.81           51,986.92            79,129.50           110,781.30
                       Q                      28,296.11           48,365.51            73,617.34           103,064.27

$300,000               N                      30,414.81           63,058.30            96,538.80           116,581.10
                       Q                      28,296.11           58,665.66            89,813.91           108,460.06

$400,000               N                      30,414.81           63,058.30            96,538.80           116,581.10
                       Q                      28,296.11           58,665.66            89,813.91           108,460.06

$500,000               N                      30,414.81           63,058.30            96,538.80           116,581.10
                       Q                      28,296.81           58,665.66            89,813.91           108,460.06
</TABLE>

N=Normal  Form  of  Benefit  for  a  Single   Participant-5  Years  Certain  and
Continuous.
Q=Normal Form of Benefit for a Married  Participant-Qualified Joint and Survivor
(50% of benefit payable to spouse at death of Participant). Spouse's age assumed
to be equal to Participant's age for above calculations. Salaries are assumed to
increase at a rate of 4% per year from date of hire through  date of  retirement
for above calculations.

     NBT has in effect a noncontributory pension plan for all eligible employees
which is  self-administered.  Eligible employees are those who work in excess of
1,000 hours per year,  have  completed one year of service and have attained age
21. The plan is qualified  under  Section  401(a) of the Internal  Revenue Code.
Employer  contributions to the plan are computed on an actuarial basis using the
projected  unit credit cost method  including  amortization  of any past service
costs over a thirty-year period. Pension costs are funded as accrued. There were
no minimum required or maximum deductible contributions for the plan year ending
December  31,  1999.  The plan  provides  for 100%  vesting  after five years of
qualified service.  Earnable compensation for the plan is defined as fixed basic
annual compensation, including bonuses, overtime and other taxable compensation,
but  excluding  NBT's  cost for any  public or private  employee  benefit  plan,
including this retirement  plan.  Benefit  computations  are based on an average
final  compensation  amount which is the average  annual  earnable  compensation
during  the five  consecutive  year  period in an  employee's  last ten years of
qualified service which produces the highest such average.

     The annual normal retirement  benefit of a participant who becomes eligible
for benefits shall equal the greater of the amounts  described in A and B below,
with that sum then reduced by the amount described in C below.

A.   The sum of (i), (ii), and (iii) below:

     i.   The  participant's  accrued benefit under the  predecessor  plan as of
          September 30, 1989.

     ii.  For years of benefit  service  earned  after  September  30,  1989 and
          before January 1, 1995,  the sum of 1.60 percent of the  participant's
          final  average  earnings  for each year of  benefit  service  plus .60
          percent of the participant's  final average earnings that is in excess
          of covered compensation for such year of benefit service.

                                       41

<PAGE>


     iii. For years of benefit  service  earned after December 31, 1994, the sum
          of 1.25 percent of the  participant's  final average earnings for each
          such year of benefit  service,  plus .60 percent of the  participant's
          final average  earnings that is in excess of covered  compensation for
          each such year of benefit service.

B.   The sum of 1.60 percent of the  participant's  final  average  earnings for
     each year of benefit  service  through  December 31, 1994, plus .65% of the
     participant's   final  average  earnings  that  is  in  excess  of  covered
     compensation for each year of benefit service through December 31, 1994.

C.   The annual normal  retirement  benefit payable to the participant  from the
     Retirement Plan of Irving Bank Corporation and Affiliated Companies.

     The number of years of benefit  service  taken into account  under the plan
     shall be  limited  to the  greater of 30, or the number of years of benefit
     service  completed  by the  participant  as of  December  31, 1994 (up to a
     maximum  of 40 for the basic  benefit  and a maximum  of 35 for the  excess
     portion of the benefit).

EMPLOYMENT AGREEMENTS

     Effective  January 1, 2000,  NBT entered into an employment  agreement with
Mr.  Forsythe.   The  agreement  provides  for  an  orderly  transition  of  the
chairmanship  of NBT to Mr. Forsythe in April 2001 when Mr. Everett A. Gilmour's
term of directorship  ends. The agreement  provides that Mr. Forsythe will serve
as the  president  and chief  executive  officer of NBT and as the  chairman and
chief executive officer of NBT Bank through March 31, 2001, and as the chairman,
president and chief executive officer of NBT and as the chairman of the board of
NBT Bank from April 2001 through December 2002. The term of the agreement may be
extended  through  December  2003  by  mutual  agreement  of  the  parties.  Mr.
Forsythe's  salary is not less than $300,000 during 2000,  $350,000 during 2001,
and $400,000 during 2002 and, if applicable,  2003.  Maximum bonus  opportunity,
provided under the Executive Incentive  Compensation Plan, will be 80% of salary
throughout the life of the agreement.  The agreement also grants Mr.  Forsythe a
right to stock  options to be granted to him  annually  under NBT's Stock Option
Plan,  covering  a  number  of  shares  of  Company  stock  equal to 250% of his
annualized  salary on the date of grant  divided by the fair market value of the
stock.  The option  exercise price will be the fair market value of the stock at
time of grant. The agreement also provides to Mr. Forsythe paid vacation time of
five weeks during 2000,  six weeks during 2001, and three weeks during 2002 and,
if applicable,  2003,  plus excusal during  January,  February and March of 2002
and, if  applicable,  during  January,  February and March of 2003 from presence
within the market  area of NBT except on an  as-required  basis as agreed by the
board of directors of NBT and Mr.  Forsythe.  Under the agreement  Mr.  Forsythe
will also receive other  benefits  including  the use of a company car,  country
club privileges, and participation in NBT's various employee benefits plans such
as the retirement  plan, the 401(k)/ESOP  Plan, and various health,  disability,
and life insurance plans.

     Effective  January 1, 2000,  NBT also entered into an employment  agreement
with Mr. Minor.  The agreement  with Mr. Minor provides that he will serve as an
executive  vice  president of NBT Bank and as the president and chief  operating
officer of NBT Financial  Services,  Inc.  through  December 31, 2002,  with two
automatic one-year extensions  occurring on January 1, 2001 and January 1, 2002.
The responsibilities of Mr. Minor will include supervisory responsibilities over
the trust  department of NBT Bank  following the retirement of the current chief
trust  officer.  Mr. Minor's  salary is not less than $230,000  initially,  with
minimum  increases  of 8 percent  per annum  beginning  in 2001.  Maximum  bonus
opportunity,  provided under the Executive Incentive  Compensation Plan, will be
75% of salary throughout the life of the contract.  In addition,  Mr. Minor will
be entitled to  accelerated  and  enhanced  retirement  benefits if, as a direct
result of his personal performance,  NBT has a sustained increase (as defined in
the  employment   agreement)  to  its  net  earnings  before  taxes  during  the
three-fiscal-year  period  before the earlier of Mr.  Minor's  retirement or the
first day of the month after Mr.  Minor's  65th  birthday.  In  general,  if the
sustained  increase to net  earnings  before taxes during this period is between
$1.5 million and $4 million,  then the retirement  benefit  otherwise payable to
Mr. Minor at age 62 will be payable at age 61, and Mr. Minor will be entitled to
a grant of $100,000 to a grantor  trust for payment to him upon his  retirement.
If the sustained

                                       42

<PAGE>



increase to net  earnings  before taxes is more than $4 million and less than $8
million,  then the retirement  benefit  otherwise payable to Mr. Minor at age 62
will be payable at age 60, and the grant to the grantor  trust for payment  upon
his  retirement  will be  $300,000.  If the  sustained  increase to net earnings
before  taxes is $8  million  or more,  then the  retirement  benefit  otherwise
payable at age 62 will be a 75% retirement  benefit (instead of a 50% retirement
benefit)  payable for retirement at age 62, or a 65% retirement  benefit payable
for retirement at age 61, or a 55% retirement  benefit payable for retirement at
age 60, and the grant to the grantor trust for payment upon  retirement  will be
$600,000.  If Mr. Minor retires before December 31, 2002, the agreement provides
procedures  for the  good-faith  estimation  of  projected  increases in the net
earnings of NBT before taxes for the remainder of the  three-fiscal-year  period
ending on December  31,  2002.  The  agreement  also grants Mr. Minor a right to
stock  options to be granted to him  annually  under  NBT's Stock  Option  Plan,
covering a number of shares of  Company  stock  equal to 250% of his  annualized
salary on the date of grant  divided by the fair market value of the stock.  The
option  exercise  price  will be the fair  market  value of the stock at time of
grant.  Under the agreement Mr. Minor will also receive other benefits including
the use of a company car,  country club privileges,  and  participation in NBT's
various  employee  benefits plans such as the retirement  plan, the  401(k)/ESOP
Plan, and various health, disability, and life insurance plans.

     Effective  January 1, 2000,  NBT also entered into an employment  agreement
with Mr. Dietrich.  The agreement with Mr. Dietrich  provides that he will serve
as the president and chief  operating  officer of NBT Bank through  December 31,
2002, with automatic one-year extensions occurring annually beginning January 1,
2002. Mr.  Dietrich's salary is not less than $230,000  initially,  with minimum
increases of 8 percent per annum beginning in 2001.  Maximum bonus  opportunity,
provided under the Executive Incentive  Compensation Plan, will be 75% of salary
throughout the life of the contract.  The agreement  also grants Mr.  Dietrich a
right to stock  options to be granted to him  annually  under NBT's Stock Option
Plan,  covering  a  number  of  shares  of  Company  stock  equal to 250% of his
annualized  salary on the date of grant  divided by the fair market value of the
stock.  The option  exercise price will be the fair market value of the stock at
time of grant. Under the agreement Mr. Dietrich will also receive other benefits
including the use of a company car, country club privileges,  and  participation
in NBT's  various  employee  benefits  plans such as the  retirement  plan,  the
401(k)/ESOP Plan, and various health, disability, and life insurance plans.

CHANGE IN CONTROL AGREEMENTS

     NBT has  entered  into a change in control  agreement  with each of Messrs.
Forsythe,  Minor,  Chewens,  Dietrich,  and Roberts.  Each agreement provides in
general that,  in the event that NBT or NBT Bank is acquired by another  company
or any of certain  other  changes in control of NBT or NBT Bank should occur and
further  if  within  24 months  from the date of such  acquisition  or change in
control  Messrs.  Forsythe's,  Minor's,  Chewens's,   Dietrich's,  or  Roberts's
respective employment with NBT or NBT Bank is terminated without cause or by the
executive  for good reason  (as defined in the  agreement),  or if the executive
resigns within 90 days of a change in control of NBT or NBT Bank irrespective of
the existence of good reason,  Messrs.  Forsythe,  Minor, Chewens,  Dietrich, or
Roberts  will be entitled to receive  2.99 times a base amount plus any gross-up
amount  required to  compensate  for the  imposition  of any excise  taxes under
section 4999 of the Internal  Revenue Code. An executive's base amount for these
purposes is generally his average  annual  compensation  includible in his gross
taxable  income  for the five  years  preceding  the year in which the change in
control  occurs  (or,  if he has been  employed  by NBT for less than those five
years,  for the number of those years during which he has been  employed by NBT,
with any partial year annualized),  including base salary,  non-deferred amounts
under  annual  incentive,   long-term  performance,  and  profit-sharing  plans,
distributions  of previously  deferred  amounts  under such plans,  and ordinary
income  recognized  with respect to stock  options.  The  agreement is effective
until December 31, 2002, and is  automatically  renewed for one additional  year
commencing at December 31, 2000 and each December 31 thereafter.

SUPPLEMENTAL RETIREMENTS BENEFITS

     NBT has  agreed  to  provide  Mr.  Forsythe  with  supplemental  retirement
benefits under a supplemental  retirement  agreement ("SERP").  The SERP for the
benefit of Mr. Forsythe provides that annual supplemental benefits at normal

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retirement  will be equal  to 75% of Mr.  Forsythe's  average  base  salary  and
bonuses for the five salary years immediately  preceding the date of retirement,
less the sum of (a) the  annual  amount  payable  to Mr.  Forsythe  under  NBT's
pension plan, (b) the annual benefit that could be provided by NBT contributions
(other than elective  deferrals) made on Mr. Forsythe's behalf plus the earnings
thereon under NBT's  401(k)/ESOP  plan if such  contributions  and earnings were
actuarially  converted  to a benefit  payable  at age 65 in the same form as the
benefit  payable under the SERP, and (c) after Mr.  Forsythe  attains his social
security  retirement  age, the annual  social  security  benefit  payable to Mr.
Forsythe.  Reduced  amounts  will be  payable  under  the SERP in the  event Mr.
Forsythe takes early retirement. Except in the case of early retirement, payment
of benefits  will  commence  upon the first day of the month after Mr.  Forsythe
attains age 65. The SERP provides that it shall at all times be unfunded (except
in the event of a change in control).

     NBT has agreed to provide  Messrs.  Minor and  Dietrich  with  supplemental
retirement  benefits under supplemental  retirement  agreements  ("SERPs").  The
SERPs  for the  benefit  of  Messrs.  Minor and  Dietrich  provide  that  annual
supplemental benefits at normal retirement payable to each of them will be equal
to 50% of the  respective  individual's  average base salary and bonuses for the
five salary years immediately preceding the date of retirement,  less the sum of
(a) the annual amount payable to each  individual  under NBT's pension plan, (b)
the annual  benefit  that could be  provided  by NBT  contributions  (other than
elective deferrals) made on each individual's  behalf  plus the earnings thereon
under NBT's 401(k)/ESOP plan if such contributions and earnings were actuarially
converted to a benefit payable at age 65 in the same form as the benefit payable
under the SERP, and (c) after attainment of social security  retirement age, the
annual social security benefit payable to each  individual. Reduced amounts will
be payable  under the SERP in the event Mr.  Minor or Mr.  Dietrich  takes early
retirement.  Except in the case of early  retirement,  payment of benefits  will
commence upon the first day of the month after Mr. Minor or Mr. Dietrich attains
age 62. The SERP provides that it shall at all times be unfunded  (except in the
event of a change in control).

     A  Supplemental  Retirement  Plan has also been provided to Mr. Roberts who
was employed by the Bank between  February 15, 1965 through November 1, 1989 and
from  February  6,  1995 to date.  The  purpose  of the plan is to  provide  the
benefits Mr.  Roberts  would have earned under NBT Bank's  Qualified  Retirement
Plan had he been  employed  continuously  by the Bank  from  February  15,  1965
through his actual termination of employment. The plan will provide supplemental
retirement income in excess of the retirement benefits otherwise provided to the
Executive under the Bank's Qualified Retirement Plan.

DARYL R. FORSYTHE EMPLOYMENT

     In  addition  to  the  employment  agreement  and  supplemental  retirement
agreement  between NBT and Mr. Forsythe  described  above,  NBT and Mr. Forsythe
have entered into a wage  continuation plan which provides that during the first
three months of disability  Mr.  Forsythe will receive 100% of his regular wages
reduced by any benefits received under social security,  workers'  compensation,
state  disability plan or any other  government  plan or other program,  such as
group coverage,  paid for by NBT Bank.  Additionally,  if the disability extends
beyond three  months,  Mr.  Forsythe  will receive  payments of $7,000 per month
under an insurance policy with The New England. The annual cost of the policy is
$7,734, which is reflected in the Summary Compensation Table above. Mr. Forsythe
and  NBT  have  entered  into  a  death  benefits  agreement.  The  policy  is a
split-dollar  life insurance policy on Mr.  Forsythe's behalf in the face amount
of $800,000.  NBT is the owner of the policy.  Upon Mr.  Forsythe's  death,  his
named  beneficiary will receive $600,000 from the policy's  proceeds,  while NBT
will receive the remainder of the policy's  proceeds.  Upon  termination  of the
death benefits agreement (e.g., upon termination of Mr. Forsythe's  employment),
Mr.  Forsythe is required to transfer all of his right,  title,  and interest in
the  policy  to  NBT.  NBT  pays  the  premium  on  the  policy,   of  which  an
actuarially-determined  amount is  attributable to Mr. Forsythe and is reflected
in the Summary Compensation Table above.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     During the fiscal  year  ending  December  31,  1999,  Everett A.  Gilmour,
Chairman of NBT and a member of the Compensation and Benefits Committee,  served
on the Board of Directors of Preferred Mutual  Insurance  Company whose Chairman
is Paul O. Stillman who is a member of NBT's and of NBT Bank's  Compensation and
Benefits  Committee.  Mr. Gilmour was Chairman of NBT from 1972 to 1988 and from
January 1995 to present.  Mr. Gilmour was Chairman of NBT Bank from 1972 to 1988
and from January 1995 to September 1999.

     The law firm of Kowalczyk,  Tolles,  Deery and Johnston,  of which Director
Andrew S. Kowalczyk,  Jr., Chairman of the Compensation and Benefits  Committee,
is a partner,  provides  legal services to NBT and NBT Bank from time to time as
does the law firm of  Stafford,  Trombley,  Owens &  Curtin,  of which  Director
William L. Owens

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is a partner. These services occur in the ordinary course of business and at the
same terms as those prevailing for comparable transactions with other law firms.

     John D.  Roberts,  an  executive  officer of NBT, is a director of the I.L.
Richer Co. whose President and CEO, John C. Mitchell, serves on the Compensation
and Benefits Committee.

     Richard Monroe, a member of the Compensation and Benefits  Committee,  is a
retiree of NBT and served as Senior Vice  President  - Manager of Newark  Valley
Office from 1973 to 1985.

COMPENSATION COMMITTEE REPORT ON EXECUTIVE COMPENSATION

     The primary responsibility of the Compensation and Benefits Committee is to
design,  implement,  and administer all facets of the  compensation and benefits
programs  of NBT for all  employees.  The  committee  is  composed  entirely  of
outside,  non-employee  directors.  The committee approves  participants who are
eligible for the Executive  Incentive  Compensation  Plan, sets the compensation
plan targets for each year and  approves  payouts  under the plan,  awards stock
option grants,  approves the annual contribution to the Employee Stock Ownership
Plan for all employees,  approves executive  compensation,  annually reviews the
performance of the CEO and recommends  the CEO  compensation  package to the NBT
Board.  The committee  presents its actions to the NBT Board for  approval.  The
objective  of NBT's  executive  compensation  program is to develop and maintain
executive  reward  programs which  contribute to the  enhancement of shareholder
value,  while  attracting  and retaining key  executives who are critical to the
long-term  success of NBT.  It is  expected  that total  compensation  will vary
annually, based on NBT and individual performance.

     The compensation  committee retains the services of an executive salary and
benefits  consultant,  who is independent and unassociated with NBT, the CEO, or
any  member of the NBT Board or  management,  to  assist  in  setting  the total
compensation package of senior management. To assist the committee in fulfilling
its  responsibilities,  the independent  consultant provides advice and guidance
directed  toward ensuring that the NBT Board's  practices are consistent  within
the industry,  consistent with and in support of the goals and objectives of NBT
and fairly applied throughout NBT.

     The  committee  believes it is critical to the ongoing  success of NBT that
its  executives  continue to be among the most  highly  qualified  and  talented
available to lead the  organization  in the creation of  shareholder  value.  In
support of this  objective,  the  philosophy  of the  committee in approving and
recommending executive compensation is based upon the following criteria:

     o    Design a total  compensation  package that includes a base salary,  an
          annual incentive plan that is linked to stockholder  interests,  and a
          stock option plan that  encourages  share ownership and is also linked
          with stockholder interests.

     o    Set  base  salaries  that  are  commensurate  with  each  individual's
          responsibility, experience, and contribution to NBT.

     o    Ensure that salaries are  competitive  within the industry so as to be
          able to attract and retain highly qualified executives.

     o    Promote a pay for performance culture.

     NBT's executive compensation program, discussed in detail below, is made up
of both fixed (base  salary) and  variable  (incentive)  compensation  elements.
Variable  compensation  consists  of annual  cash  incentives  and stock  option
grants.   The  committee  and  the  management  of  NBT  believe  that  variable
compensation  should be based both on short-term and long-term  measurements and
be directly and visibly tied to NBT performance, so that, while

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introducing  appropriate  risk in the  payout  levels,  such  compensation  will
promote a pay for performance culture within the executive team.

     In reviewing executive  compensation,  the committee considers a variety of
factors  including  past  performance  and  the  NBT  Board's  expectations  for
improvement  in the  future.  The CEO and  senior  executive  management  review
executive compensation throughout the year. The CEO presents recommendations for
compensation for the Executive  Management Team to the Committee each year prior
to  year-end  for their  approval.  The  committee  annually  reviews  the CEO's
performance against pre-established goals and with respect to the performance of
NBT. The committee  considers  improvements in historical  measures such as ROA,
ROE, profit levels,  non-performing  assets to total assets and net non-interest
expense to total expense in its assessment of performance.  While net income was
down  $0.7  million  or 3.8% in 1999 from  1998,  income  before  taxes of $30.0
million in 1999 improved  dramatically by $6.3 million,  or 26.7%, over the 1998
amount of $23.7 million.  The  efficiency and expense ratios also improved.  NBT
maintained  safety and  soundness  and once again  received a "blue  ribbon" and
"five star" ratings by outside agencies.

BASE SALARY.  Although not specifically  weighted,  the committee considered the
performance  of  each  executive,  the  level  of  responsibility,  and  current
inflationary  indices in establishing base salaries for executive officers.  The
committee has  established  salary ranges with the  assistance of the salary and
benefits consultant;  salary ranges are based upon  responsibility,  experience,
and individual  performance.  Mr. Forsythe receives an annual salary of $300,000
for  2000.  In  determining  Mr.  Forsythe's  salary,  the  committee  took into
consideration  the salaries of CEOs of  similar-sized  banks, the performance of
the Bank, and the recommendations of the salary consultant.

EXECUTIVE  INCENTIVE  COMPENSATION PLAN. The committee,  working with an outside
salary and benefits  consultant,  designed the current incentive plan that links
the payout with stockholder  interests.  The committee  reviews the compensation
plan annually.  The  compensation  plan, as it now exists,  has three components
which determine the potential award within such plan:  Return on Assets,  Return
on Equity, and a net income goal. The compensation plan has a minimum net income
requirement before any payout is possible. There are participative levels within
the  compensation  plan which range from the maximum  payout being 75% of salary
for presidents of NBT's  subsidiaries  and 30% for the lowest level.  Each level
has a corporate performance component and an individual  performance  component.
The corporate component is 80% and the personal component is 20% for the highest
level below CEO. The committee sets "stretch" targets under the plan.

     The executive incentive  compensation plan established a separate level for
the CEO. The  compensation  plan provided for a maximum  payout of 80% of salary
with the range of the bonus  awarded being based on corporate  performance.  Mr.
Forsythe's  bonus  earned in 1999 was  $200,000  (66.7%).  The bonus was paid in
2000.

     The committee evaluated other executives  receiving bonuses on the basis of
comparisons to predetermined corporate and personal goals. Each officer achieved
a majority of his goals and received bonuses comparably.

STOCK OPTION PLAN. In order to provide  long-term  incentives to key  employees,
including executive officers, to encourage share ownership by key officers,  and
to retain and motivate key officers to further  stockholder  returns,  NBT has a
Stock Option Plan.  The  committee  believes that stock  options,  which provide
value to  participants  only when NBT's  stockholders  benefit  from stock price
appreciation,  are  an  important  component  of  NBT's  executive  compensation
program.  The number of options  currently held by an officer is not a factor in
determining individual grants. The value of stock options granted in 1999 ranged
from  250% of base  compensation  at the CEO  level  down to  1,000  shares  for
selected individuals. "Value" is determined by multiplying the number of options
granted by the fair market  value of the NBT common stock which  underlies  such
options on the date of the grant. With respect to the options granted in 1999 to
the CEO and to all other selected  officers,  the committee in making the awards
considered the various factors referred to above,  especially the growth of NBT,
its  financial  condition,  and  profitability.  The committee did not apply any
specific  weighting to the factors  considered.  The number of options which the
committee  granted to the officers  was based upon  individual  performance  and
level  of  responsibility,   subject  to  committee-imposed   restrictions.  The
Committee determined that the award level must be sufficient in size

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to provide a strong  incentive for  participants to work for long-term  business
interests of NBT, thereby creating  additional  stockholder value resulting from
the appreciation of NBT stock, and to become  significant owners of NBT. Options
are granted at the fair market value of NBT's stock at the time of grant.  Under
the 1993 Plan,  options  vest at the rate of 40% after one year of date of grant
and an additional  20% each year  thereafter.  Since an option gives the officer
only the right to buy these  shares at a fixed price over a future  period,  the
compensation value is derived by the incentive to increase  shareholder value in
the future; hence, the motivation to improve NBT's performance.

MEMBERS OF THE COMPENSATION AND BENEFITS COMMITTEE

Andrew S. Kowalczyk, Jr.- Chairman
Everett A. Gilmour
Dr. Peter B. Gregory
Paul O. Stillman
John C. Mitchell
Richard F. Monroe
William L. Owens

401(k) AND EMPLOYEE STOCK OWNERSHIP PLAN

     NBT amended the Employee Stock Ownership Plan and 401(k) Plan,  merging the
two plans together effective January 1, 1997. This merged and amended 401(k) and
Employee Stock Ownership Plan is for the exclusive benefit of eligible employees
and their beneficiaries. The Plan is administered by NBT Bank. Discretionary and
matching  contributions  are primarily in NBT's common stock. The stock is voted
by the Plan's  Trustees  only as  participants  direct the  Trustees  to vote by
properly  executing a proxy. At December 31, 1999, the Plan owned 883,321 shares
of NBT's common stock, 6.74% of total shares outstanding.

     All employees of NBT and NBT Bank are eligible to  participate  in the plan
after  one  year's  service,  if they are at least 21 years of age and  complete
1,000 hours of service during the year. The Plan provides for partial vesting of
an  employee's  interest  in the Plan at 20% per year  with 100%  vesting  being
achieved after five years of qualified service.

     However,   401k   participants   are  eligible  to  make  salary  reduction
contributions  after the date of hire if they are  scheduled to work 1,000 hours
in a twelve-month  period. The plan provides that an eligible employee may elect
to defer up to 15% of his or her salary  for  retirement  (subject  to a maximum
limitation  of  $10,000)  and that  NBT or NBT  Bank  will  provide  a  matching
contribution of 100% of the first 5% of the employee's deferred amount. In 1999,
NBT or NBT Bank provided a matching  contribution to Mr. Forsythe of $8,000, Mr.
Minor of $8,000,  Mr. Dietrich of $8,000,  Mr. Chewens of $7,692 and Mr. Roberts
of $8,000. These payments are reflected in the Summary Compensation Table.

     For the ESOP, NBT makes discretionary contributions, as determined annually
by the NBT Board, to a separate trust for the benefit of the eligible  employees
and their beneficiaries.  Annual contributions may not exceed amounts deductible
for federal income tax purposes.  Employer contributions are allocated among all
participants in proportion  that each  participant's  compensation  for the plan
year  bears to the  total  compensation  of all  participants  for the plan year
(compensation for the plan is defined as total  compensation  during a Plan Year
that is subject to income tax and  reflected  on the W-2 Form,  but  including a
salary  reduction  contribution  to any plan or  arrangement  maintained  by the
company,  and excluding  distributions from non-qualified plans, income from the
exercise of stock options, and severance payments).  The NBT Board may amend the
plan at any time.

     The  value of a  participant's  ESOP  account  is the  total  of  allocated
employer  contributions,  employee salary deferrals,  plus the earnings on those
contributions and deferrals, plus or minus any gain or loss on the investment of
the contributions and deferrals.

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     Normal  retirement  age under the Plan is 65.  The Plan also  provides  for
early retirement at age 55 and disability  retirement at any age. In the event a
participant dies before retiring under the Plan, the value of his or her account
in the Plan will be paid to his or her beneficiary.

     A  participant's  retirement  benefit under the Plan is the value of his or
her account at the date of  retirement.  Effective  January 1, 1985,  the normal
form of  retirement  benefit  for a married  employee  is a joint  and  survivor
annuity;  for an employee who is not married,  a lump sum  distribution of cash.
Other available  retirement options are: 1) installment  payments of cash and 2)
distributions  of the account  value in  employer  securities,  both  subject to
obtaining spousal waivers.

     As a qualified plan (under current law) employer contributions and employee
salary deferrals are not currently taxed to employees;  and retirement  benefits
will be taxable to employees when received from the Plan.

     In 1999, NBT made a discretionary contribution of $487,384 to the Plan. The
Summary  Compensation  Table  reflects  payments  made to NBT's named  executive
officers under the Plan.

STOCK OPTION PLAN

     The NBT Board adopted stock option plans in 1986 and in 1993, which the NBT
stockholders  approved at the 1987 and 1993 Annual Meetings,  respectively,  and
amended  the 1993  plan  which  the  stockholders  approved  at the 1998  Annual
Meeting.  The purposes of the plans are to encourage  ownership of capital stock
of NBT by officers and other key employees of NBT and its  subsidiaries in order
to help attract and retain in its service persons of exceptional competence,  to
furnish added  incentives  for them to increase  their efforts on behalf of NBT,
and to gain for NBT the advantages inherent in key employees having an ownership
interest in NBT. Upon approval of the 1993 Stock Option Plan,  the 1986 plan was
"frozen"  and NBT may not grant any new  options  or stock  appreciation  rights
under that plan.

     The  1993  Plan  is  intended  to  promote  the  interests  of NBT  and its
stockholders by ensuring continuity of management and increased incentive on the
part of officers and other key management  employees of NBT and its subsidiaries
responsible   for  major   contributions   to  effective   management,   through
facilitating their acquisition of equity interests in NBT.

     The 1993 Plan  authorizes the granting of options to purchase shares of the
NBT  common  stock  to  officers  and key  management  employees  of NBT and its
subsidiaries.  Common  stock issued  under the 1993 Plan may be  authorized  but
unissued  common stock or  reacquired  common stock,  or both.  The 1993 Plan is
administered by the NBT Board,  the Compensation  and Benefits  Committee,  or a
subcommittee of that  committee,  consisting of at least three NBT Directors who
are  disinterested  directors as defined by Rule 16b-3  adopted by the SEC under
the Securities Exchange Act of 1934.

     The  committee  (or  subcommittee,  as the  case may be) is  authorized  to
determine  the  employees  to whom  grants of options may be made under the 1993
Plan,  the number and terms of options to be granted to each employee  selected,
the time or times when options will be granted,  the period during which options
will be  exercisable,  and the  exercise  price per share of common  stock.  The
exercise  price may not be less than the fair market  value of a share of common
stock at the date of the option grant.

     The recipient of options granted to an employee under the 1993 Plan may not
transfer his or her options  otherwise than by will or by the law of descent and
distribution,  and such option may be exercisable during that person's life only
by him or her. No option may be  exercisable  after the  expiration of ten years
from the date the option is granted. The terms of an option must provide that it
is exercisable only in specified  installments  during the option period: to the
extent of forty percent of the number of shares originally  covered with respect
to each  particular  grant of options,  at any time after the  expiration of one
year from the date of grant,  and to the extent of an additional  twenty percent
of such number of shares upon the  expiration of each  succeeding  year, so that
upon the expiration of

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<PAGE>


four years from the date of grant one  hundred  percent of such number of shares
will be eligible for exercise by the recipient. The installments are cumulative.
Upon  termination of his or her  employment,  options will be exercisable to the
extent  that he or she was  entitled  to  exercise  the  option  at the  date of
termination;  upon the employee's  death, the option will become  exercisable in
full on the date of death.

     The 1993 Plan provides that it will expire on April 18, 2008. The 1993 Plan
provides  that for each share of common stock  purchased by an optionee upon the
exercise of a stock option,  the optionee  will receive a replacement  option to
purchase  another common share.  Granting of a replacement  option is subject to
the express approval of the NBT Board or committee.  The 1993 Plan provides that
immediately  upon the occurrence of a change in control of NBT, all  outstanding
options will immediately  vest and become  exercisable in full. If an optionee's
employment with NBT or its  subsidiaries is terminated for cause, the optionee's
options will be canceled and rendered  null and void on the date the  employment
is terminated.

     The 1993 Plan  provides  that,  if there  occurs a change in the  number of
outstanding  shares of common stock by reason of a stock split,  stock dividend,
recapitalization,   reclassification,   merger,  consolidation,  combination  or
exchange of shares or other similar event, the Committee may, in its discretion,
make such adjustments as may be equitably  required in the number of shares that
may be issued under the 1993 Plan,  in the number of shares which are subject to
outstanding  options,  and in the  purchase  price  per  share  relating  to the
outstanding options.

     The NBT Board may amend the 1993 Plan at any time  without the  approval of
the  stockholders  of NBT, but no amendment  which (a)  increases  the aggregate
number of shares as to which  options may be granted  under the 1993 Plan (other
than equitable  adjustments  referred to in the immediately  preceding paragraph
which will not constitute amendments), (b) changes the class of persons eligible
to receive  options,  (c) changes the  provisions of the 1993 Plan regarding the
option price,  (d) extends the period  during which options may be granted,  (e)
extends the maximum  period after the date of grant during which  options may be
exercised, or (f) changes the provision in the 1993 Plan as to qualification for
membership on the committee will be effective  unless and until the amendment is
approved  by  the  stockholders  of  NBT.  In  the  event  of a  dissolution  or
liquidation  of NBT or a merger or  consolidation  in which NBT is not to be the
surviving  corporation  or a sale  of  substantially  all the  assets  of NBT to
another  corporation,   every  option  outstanding  under  the  1993  Plan  will
terminate, except that the optionee will have the right to exercise, prior to or
simultaneously  with such event,  his option to purchase  any or all shares then
subject to the  option,  including  those,  if any,  which have not  theretofore
become available for purchase under other provisions of the 1993 Plan.

     As of December  31,  1999,  1,676,947  shares of its common stock have been
reserved  for  issuance  under the Plans.  In 1999,  NBT  granted  non-qualified
options, which expire in 2009, for 218,825 shares to 53 key employees, at option
prices  ranging  from  $17.12  to  $20.60.   Options  for  817,890  shares  were
outstanding at December 31, 1999 with option prices ranging from $5.84 to $20.60
per share for all  officers  as a group.  All grants of options  were at 100% of
fair market value as of date of the grant.  We have adjusted  Options and option
prices for all stock dividends to date.

FEDERAL INCOME TAX CONSEQUENCES

     Under the present  provisions  of the  Internal  Revenue  Code of 1986,  as
amended,  the federal income tax  consequences  of the 1993 Plan are as follows:
the granting of a non-qualified option to an employee will not result in taxable
income to the recipient or a deduction in computing the income tax of NBT or any
subsidiary.  Upon  exercise of a  non-qualified  option,  the excess of the fair
market value of the shares  acquired over the option price is (a) taxable to the
optionee as ordinary  income and (b)  deductible in computing  NBT's income tax,
subject to  satisfying  applicable  withholding  requirements  and general rules
relating to reasonableness of compensation.

EXECUTIVE INCENTIVE COMPENSATION PLAN

     NBT adopted, effective January 1, 1992, an Executive Incentive Compensation
Plan to promote individual motivation for the achievement of NBT's financial and
operating objectives and to aid in attracting and retaining

                                       49

<PAGE>


highly qualified  personnel.  Pursuant to the compensation plan, officers of NBT
are  eligible to receive  cash in the event  certain  performance  criteria  are
satisfied.  The  operation  of the  compensation  plan is  predicated  on  NBT's
attaining  and  exceeding  management  performance  goals.  The goals consist of
return on average assets,  return on stockholders'  equity, and the level of net
income. Unless a participant elects to have all or a portion of his or her award
deferred,  distribution  of awards will be made in cash during the first quarter
after  year-end.  The  Compensation  and  Benefits  Committee  must  approve all
distributions.  This committee has broad  discretion in determining  who will be
eligible  to  receive  incentive  compensation  awards  and has full  power  and
authority to interpret,  manage,  and  administer  the  compensation  plan.  The
compensation  plan  provides  that  the  Chief  Executive  Officer  of NBT  will
recommend to the committee the amounts to be awarded to individual participants.
The Chief Executive  Officer may also recommend a change beyond the formula to a
bonus award to a  participant.  The  committee  has the  authority  to amend the
recommendation.

     The committee makes bonus awards in accordance with an established formula.
An  employee  will  be  placed  into  a  particular  level,   according  to  the
participant's  office and  responsibility.  Depending upon the particular level,
the 2000 award will range from 0% to 50% of the participant's  regular salary at
the  lowest  level to 0% to 80% of the  salary  at the CEO  level.  The  formula
provides that the financial  criteria  necessary for plan  operation  consist of
return on  average  assets,  return  on  equity,  and the  level of net  income.
Incentive  distributions will be based upon attainment of corporate  performance
goals to  establish  the  total  awards.  The  total  awards,  in turn,  will be
determined  by  reference  to both  corporate  and  individual  components.  The
corporate  component  will be determined  by  attainment of corporate  goals (as
established by the Committee) and the individual component will be determined by
attainment  of  individual  goals  (objectives   mutually  agreed  upon  between
participants  and the Chief  Executive  Officer).  The corporate  component will
range  from 100% for the  highest  level  (the  President  and  Chief  Executive
Officer) to 50% for the lowest  level,  whereas the  individual  component  will
range from 0% for the highest level to 50% for the lowest level.

     The compensation  plan requires that the Chief Executive  Officer will have
purchased  such number of shares of NBT common stock as will equal at the end of
the five years twice his or her current base salary.

     In addition, the compensation plan also requires that the Presidents of any
of NBT's  subsidiaries  will have  purchased such number of shares of NBT common
stock as will equal at the end of five years from their appointment as President
his or her current base salary.

     We include the amount of incentive  compensation  awards to the individuals
named in the Summary  Compensation Table in the "Bonus" column of that table. We
made payments of bonuses for 1999 under the Plan in January 2000.

PERSONAL BENEFITS

     During the past fiscal year, no director,  officer or principal stockholder
or members of their respective  families  received any banking services or other
benefits,  including  use of any staff,  facilities  or  properties  of NBT, not
directly related to job performance and not generally available to all employees
of NBT. We routinely  provide  health  insurance and group life insurance to all
staff members.

RELATED PARTY TRANSACTIONS

     NBT Bank has had,  and expects in the future to have,  transactions  in the
ordinary  course of business with  directors and officers of NBT and NBT Bank on
the same terms as those prevailing at the time for comparable  transactions with
others.  NBT Bank has extended  credit to its  directors  and officers and their
business  interests.  The total of these loans was  $3,563,357,  $4,441,730  and
$6,401,538  at December 31, 1997,  1998,  and 1999,  respectively,  representing
2.9%, 3.4% and 5.1% of equity capital at those dates, respectively.  The highest
aggregate  amounts  outstanding  on such loans during 1997,  1998, and 1999 were
$5,008,597,  $5,313,091, and $7,140,566,  respectively,  which represented 4.0%,
4.1% and 5.6% of equity capital at those interim dates, respectively.

                                       50

<PAGE>

     NBT Bank made all outstanding  loans to such persons in the ordinary course
of  business  on  substantially  the same terms,  including  interest  rates and
collateral,  as those  prevailing at the time for comparable  transactions  with
other  persons,  and, in the  opinion of  management,  do not present  more than
normal risk of collectability or present other unfavorable features.  Based upon
the  information  available  to it, NBT Bank does not  consider  that any of the
officers  or  directors  of NBT  Bank  or NBT  had a  material  interest  in any
transactions  during  the last  year,  except as stated  above,  or have such an
interest in any proposed transactions.

PERFORMANCE GRAPH

     The following graph compares the cumulative total shareholder return (i.e.,
price change,  reinvestment of cash dividends and stock  dividends  received) on
NBT's  common  stock  against the  cumulative  total  return of the NASDAQ Stock
Market (US Companies) Index and the Index for NASDAQ Financial Stocks. The stock
performance graph assumes that $100 was invested on December 31, 1994. The graph
further assumes the reinvestment of dividends into additional shares of the same
class of equity  securities  at the frequency  with which  dividends are paid on
such securities during the relevant fiscal year. The yearly points marked on the
horizontal axis correspond to December 31 of that year. We calculate each of the
referenced  indices in the same manner.  All are  market-capitalization-weighted
indices,  so companies  judged by the market to be more  important  (i.e.,  more
valuable) count for more in all indices.

     COMPARISON OF FIVE YEAR CUMULATIVE TOTAL RETURN AMONG NBT BANCORP INC., THE
INDEX FOR NASDAQ  FINANCIAL  STOCKS,  AND THE NASDAQ STOCK MARKET (US COMPANIES)
INDEX.

(FOLLOWING IS A TABULAR  PRESENTATION OF DATA POINTS FOR THE GRAPH WHICH APPEARS
HERE IN THE PAPER COPY)

Measurement                NBT              NASDAQ               NASDAQ
Period (Fiscal             BANCORP          Financial            Composite Index
Year Covered)              INC.             Stock Index          (US Companies)
- -------------              ----             -----------          --------------
4Q94                       $100.00            $100.00                $100.00
1Q95                       $ 97.70            $110.70                $108.90
2Q95                       $ 99.96            $119.40                $124.65
3Q95                       $102.23            $134.65                $139.59
4Q95                       $114.65            $145.16                $140.95
1Q96                       $112.23            $149.69                $147.82
2Q96                       $108.96            $151.61                $159.00
3Q96                       $113.16            $165.72                $164.71
4Q96                       $127.74            $185.63                $173.41
1Q97                       $139.45            $192.95                $164.18
2Q97                       $193.26            $225.04                $194.09
3Q97                       $190.89            $262.56                $227.07
4Q97                       $206.41            $290.88                $211.79
1Q98                       $215.36            $304.27                $247.83
2Q98                       $261.97            $293.40                $256.04
3Q98                       $239.20            $242.08                $229.14
4Q98                       $257.11            $282.83                $296.88
1Q99                       $231.49            $273.19                $333.51
2Q99                       $229.21            $295.34                $364.24
3Q99                       $195.47            $247.56                $372.63
4Q99                       $185.68            $257.48                $552.47

                                   PROPOSAL 2
                           (ONLY STOCKHOLDERS OF NBT)

  PROPOSAL TO RATIFY THE BOARD OF DIRECTORS ACTION IN SELECTION OF KPMG LLP AS
                            NBT'S INDEPENDENT AUDITOR

     The NBT Board upon the  recommendation  of the Audit,  Compliance  and Loan
Review Committee has appointed KPMG LLP as independent auditor of NBT to examine
the financial  statements  of NBT for the fiscal year ending  December 31, 2000.
KPMG LLP (and its predecessors)  has served as NBT's  independent  auditor since
January 1987. Ratification of such appointment will require the affirmative vote
of the holders of a majority of the shares of NBT common  stock  represented  at
the annual  meeting in person or by proxy and  entitled  to vote.  THE NBT BOARD
RECOMMENDS  A VOTE FOR  PROPOSAL  2. In the event the NBT  stockholders  fail to
ratify this  appointment,  the NBT Board will  consider  such negative vote as a
directive to select other  auditors for the current year.  The named agents will
vote proxies FOR this proposal unless  stockholders  specify  otherwise in their
proxies.

     We  expect  representatives  of KPMG LLP to be  present  at the NBT  annual
meeting.  Those  representatives will have an opportunity to make a statement if
they  desire to do so and will  also be  available  to  respond  to  appropriate
questions.
                                       51

<PAGE>


                                   PROPOSAL 3
                           (ONLY STOCKHOLDERS OF NBT)

                APPROVAL OF THE NBT EMPLOYEE STOCK PURCHASE PLAN

     On March 9, 2000,  the NBT Board  adopted the NBT Employee  Stock  Purchase
Plan (the "ESPP"),  effective  March 31, 2000,  for the benefit of its employees
and reserved  500,000  shares of NBT common  stock for issuance  under the ESPP,
subject to stockholder approval within 12 months of Board approval.

     At the annual meeting,  the NBT stockholders are being asked to approve the
ESPP,  including  the NBT Board's  reservation  of shares under the ESPP for the
purpose of  qualifying  such  shares for special tax  treatment  under  Internal
Revenue Code Section 423.

     OUR  BOARD  OF  DIRECTORS  RECOMMENDS  A VOTE FOR THE  APPROVAL  OF THE NBT
EMPLOYEE  STOCK  PURCHASE PLAN AND THE  RESERVATION OF SHARES FOR ISSUANCE UNDER
THE PLAN.

VOTE REQUIRED

     Approval of the ESPP  requires  the  affirmative  vote of a majority of the
shares of common stock  represented  at the annual meeting in person or by proxy
and entitled to vote at the meeting.

SUMMARY OF THE ESPP

     General.  The  purpose of the ESPP is to provide  employees  of NBT and its
subsidiaries  with an  opportunity  to purchase  shares of NBT common stock and,
therefore,  to have an additional incentive to improve their job performance and
to  contribute to the  prosperity of NBT.  There will be no brokerage or service
charges to employees purchaseing stock under the ESPP.

     Administration.  The ESPP is administered by the  Compensation and Benefits
Committee  appointed by the NBT Board.  The  committee  will consist of no fewer
than two members of the NBT Board. The committee has full power to interpret the
ESPP, and the decisions of the NBT Board and the committee are final and binding
upon all participants. Members of the committee are not permitted to participate
in the ESPP. NBT will pay all costs of administration of the ESPP.

     Eligibility.  Any person who is employed by NBT or one of its  subsidiaries
in December is eligible  to  participate  in the ESPP during an annual  offering
period beginning on the following January 1.  Additionally,  employees of NBT or
one of its subsidiaries on March 30, 2000 will be eligible to participate in the
ESPP during  calendar 2000.  However,  no employee is eligible to participate in
the ESPP to the extent that,  immediately  after the grant,  that employee would
own 5% of either the voting  power or the value of NBT's  common  stock,  and no
employee's  rights to purchase  NBT common  stock under the ESPP may accrue at a
rate  that  exceeds  $25,000  per  calendar  year.   Eligible  employees  become
participants in the ESPP by filing with NBT an  authorization  form  authorizing
payroll or commission deductions on a date set by the committee.  As of February
25, 2000,  approximately  697 NBT employees,  including ten executive  officers,
were  eligible  to  participate  in the  ESPP.  Non-employee  directors  are not
eligible to participate in the ESPP.

     Participation in an Offering. The ESPP is implemented by an offering period
during each calendar  year. The initial  offering  period will commence on March
31, 2000.  Following this initial offering  period,  all future offering periods
will  commence on January 1.  Persons who become NBT  employees  after March 30,
2000 will be eligible to  participate  in the ESPP on the first  January 1 after
the employee becomes employed by NBT. Each employee,  in order to participate in
the ESPP, must authorize payroll deductions pursuant to the ESPP.

     Such  payroll  deductions  may not be less  than 1% nor more  than 10% of a
participant's  compensation  and are also subject to the  limitations  discussed
above. A participant may not increase or decrease his or her rate of

                                       52

<PAGE>


contribution through payroll deductions during the calendar year for that year's
NBT common stock  purchases.  Each participant who has elected to participate is
automatically  granted  an option to  purchase  shares of common  stock upon the
commencement  of his or her  participation  in the ESPP.  The option  expires on
December 31 of that  calendar  year when common stock  purchases  are made.  The
option is  exercised  on December 31 to the extent of the payroll or  commission
deductions  accumulated during that calendar year. The number of shares that may
be  purchased  by an  employee  during  any  calendar  year  is  subject  to the
limitations discussed below.

     Purchase  Price.  The option price of shares of NBT common stock  purchased
under the ESPP will be the lower of 85% of the fair  market  value of NBT common
stock on (a) January 1 (or March 31,  2000 in the  initial  year of the ESPP) or
(b) December 31 of that calendar year. In general,  the ESPP defines fair market
value as the average of the  closing or last  prices of NBT common  stock on the
Nasdaq  National  Market  for  the  ten  consecutive  trading  days  immediately
preceding such date.

     Shares  Purchased.  The number of shares of NBT common stock a  participant
purchases in each  calendar  year is  determined by dividing the total amount of
payroll  deductions  withheld from the  participant's  compensation  during that
calendar year by 85% of the fair market value of the NBT common stock on January
1 of that calendar year (or March 31, 2000 in the initial year of the ESPP). The
committee  will  establish  a book  entry  account  for  each  participant.  The
committee  will  credit  shares  of  NBT  common  stock  to  each  participant's
respective   account  in  whole   shares  and   fractions  of  a  share  to  one
one-thousandth of a share (three decimal places).  NBT common stock issued under
the ESPP may not be sold by a participant and is not transferable, other than to
the  participant's  estate  or  by  bequest  or  inheritance,  incident  to  the
participant's divorce, or due to the participant's immediate and heavy financial
need,  for  one  year  after  the  date  of  purchase.   Shares  credited  to  a
participant's  book  entry  account  will be held in  uncertificated  form for a
period of one year from the date of  purchase,  except as provided  above and in
the case of a participant's termination of employment. Thereafter,  participants
may obtain stock  certificates for those shares that have been held for one year
in their respective book entry accounts upon submitting a written request to the
committee.

     Termination of Employment.  Termination of a  participant's  employment for
any  reason,  excluding  death,  immediately  cancels  his  or  her  option  and
participation in the ESPP. In that event, the payroll deductions credited to the
participant's  account will be returned to him or her with interest. In the case
of death, the  participant's  beneficiary,  executor or administrator  may elect
either to withdraw  the amount  credited to the  employee's  account  during the
calendar  year  from  payroll  deductions  with  interest  or to  exercise  that
employee's  option on the December 31st next following the employee's  death for
the number of shares of NBT common stock which the employee's payroll deductions
prior to death will purchase at the applicable option price.

     Adjustments Upon Changes in  Capitalization,  Merger or Sale of Assets.  In
the event  that NBT common  stock is  changed  by reason of any  reorganization,
recapitalization,   reclassification,  merger,  consolidation,  spin-off,  stock
dividend,  stock  split or other  similar  changes in NBT's  capital  structure,
appropriate  proportional  adjustments  may be made in the  number  of shares of
stock  subject  to the ESPP,  the  number  of  shares  of stock to be  purchased
pursuant  to an option  and the price per share of common  stock  covered  by an
option.   The  NBT  Board  will  make  any  such   adjustment  and  the  Board's
determination will be conclusive and binding.

     Amendment and Termination of the Plan. The NBT Board may terminate or amend
the ESPP at any  time,  except  that it may not  increase  the  number of shares
subject  to the ESPP,  amend the  requirements  as to  employee  eligibility  to
participate in the ESPP, or permit the members of the committee or  non-employee
directors to purchase NBT common  stock under the ESPP.  The ESPP will  continue
until the earlier of the date on which plan  participants  shall have  purchased
the total number of shares available for purchase under the ESPP or such earlier
date that the NBT Board terminates the ESPP.

     Withdrawal. Generally, a participant may withdraw from the ESPP at any time
during the calendar year prior to December 31 (or the date of option exercise if
before December 31).

                                       53

<PAGE>


     New  Plan  Benefits.  Because  benefits  under  the  ESPP  will  depend  on
employees'  elections  to  participate  and the fair market  value of NBT common
stock at various future dates, it is not possible to determine the benefits that
will be  received  by  executive  officers  and other NBT  employees  if the NBT
stockholders approve the ESPP.

FEDERAL INCOME TAX CONSEQUENCES

     The plan is intended to qualify under the  provisions of Section 423 of the
Code. No income will be realized for federal  income tax purposes by an employee
upon the purchase of shares under the plan.

     The  manner in which an  employee  will be taxed  upon the  disposition  of
shares depends on whether the disposition  occurs before or after the end of the
required  holding period.  The required  holding period ends on the later of the
following  dates:  (i) two years  after the date on which the right to  purchase
shares was granted, or (ii) one year after the date the shares were purchased.

     If disposition  occurs after the end of the required  holding  period,  the
gain on sale of the  shares  (or their  increase  in value in the event of death
prior to sale)  will,  under the  present  provisions  of the Code,  be taxed as
ordinary  income  to the  extent of the  lesser  of (i) an  amount  equal to the
difference  between the fair market value of the shares on the date of grant and
85% of such value on such date or (ii) an amount equal to the difference between
the fair market  value of the shares at the time of  disposition  and the amount
paid for such  shares  under the plan.  Any  additional  gain will be treated as
long-term  capital gain assuming the shares are capital assets in the employee's
hands.  If the required  holding  period is met, NBT will not be entitled to any
deduction for federal income tax purposes with respect to that stock.

     If disposition  occurs before the end of the required  holding period,  the
gain on the sale of the shares will,  under the present  provisions of the Code,
be taxed as ordinary income to the extent of the difference between the purchase
price of the  shares  and the fair  market  value of the  shares on the date the
shares were purchased, and such difference will be deductible by NBT for federal
income  tax  purposes  and any  remaining  gain or loss  would be  treated  as a
short-term capital gain or loss.

     We do not intend the previous  paragraphs to be a complete statement of the
federal income tax consequences of the plan. Moreover, no consideration has been
given to state, local or other tax consequences.

     The  foregoing  is only a  summary  of the  ESPP  and is  qualified  in its
entirety by  reference to its full text, a copy of which we attach to this joint
proxy statement/prospectus as Appendix E.


                                   PROPOSAL 4
       (ALL STOCKHOLDERS OF NBT AND ALL STOCKHOLDERS OF PIONEER AMERICAN)

     THE ISSUANCE OF NBT COMMON STOCK IN THE MERGER AND RATIFICATION OF THE
                                MERGER AGREEMENT

     The following  summary  describes the material  terms and provisions of the
merger agreement and the merger. We have attached a copy of the merger agreement
to this joint proxy statement/prospectus as Appendix A, and we have incorporated
it into this document by reference.  We urge all stockholders to read the merger
agreement carefully in its entirety.  We qualify this summary in its entirety by
reference to the merger agreement.

                                       54

<PAGE>


GENERAL

     We expect to complete the merger in the second quarter of 2000. NBT will be
the surviving  corporation in the merger.  Each share of NBT common stock issued
and  outstanding  immediately  prior to the  effective  time of the merger  will
remain issued and outstanding as one share of common stock of NBT. Each share of
Pioneer  American  common stock issued and  outstanding at the effective time of
the merger will  convert  into the right to receive  1.805  shares of NBT common
stock upon completion of the merger.

     Upon  completion  of the  merger,  NBT  will  issue to the  former  Pioneer
American stockholders 1.805 shares of NBT common stock for each share of Pioneer
American  common stock  outstanding as of the effective  time of the merger.  If
there are no  stockholders  of Pioneer  American who shall have exercised  their
dissenters'  rights  with  respect to the merger and to whom NBT shall have paid
cash in exchange for their  dissenting  shares of Pioneer American common stock,
NBT will issue an aggregate of approximately 5.2 million of its shares of common
stock to the former Pioneer  American  stockholders at the effective time of the
merger.  Under the regulations of the Nasdaq Stock Market,  NBT must receive the
approval of its  stockholders  prior to its  issuance of its common stock to the
former Pioneer American  stockholders in the merger.  Nasdaq regulations require
the affirmative vote of a majority of the shares of NBT common stock present, in
person or by proxy, and voting and entitled to vote at the NBT annual meeting to
approve the share issuance proposal.

     Under the merger agreement,  Levon Acquisition  Company,  a newly organized
Delaware  corporation  formed  solely for the purpose of the merger,  will merge
with and into Pioneer American,  the separate corporate  existence of Levon will
cease,  and Pioneer  American will survive and continue its corporate  existence
under the laws of the Commonwealth of Pennsylvania. The merger of Levon with and
into Pioneer  American will become  effective upon the filing of the Certificate
of Merger with the Secretary of State of the  Commonwealth of Pennsylvania or at
such later time specified in the  Certificate of Merger.  Immediately  following
the  completion of that merger,  Pioneer  American will merge with and into NBT,
the separate  corporate  existence of Pioneer  American will cease, and NBT will
survive and  continue  its  corporate  existence  under the laws of the State of
Delaware.  We refer  below to these  two  mergers  collectively  as the  merger.
Subject  to the  satisfaction  or waiver of  conditions  set forth in the merger
agreement  and  described in "The Issuance of NBT Common Stock in the Merger and
Ratification of the Merger  Agreement -- Conditions to Complete the Merger," the
merger of Pioneer  American  with and into NBT will  become  effective  upon the
filing of the  Certificate of Merger with the Secretary of State of the State of
Delaware or at such later time specified in the Certificate of Merger.  We refer
below to the time of  effectiveness  of the merger between Pioneer  American and
NBT as the effective time of the merger.

     The  NBT   Certificate  of   Incorporation   will  be  the  Certificate  of
Incorporation  of the combined  company upon  completion of the merger.  The NBT
bylaws will be the bylaws of the combined company.

BACKGROUND OF THE MERGER

     The senior  managements of NBT and Pioneer  American have from time to time
considered the possibility of acquisitions  of and strategic  combinations  with
other financial institutions, including other bank holding companies. As part of
their long term  planning,  the NBT Board and the  Pioneer  American  Board have
periodically  reviewed and evaluated  various strategic options and alternatives
available to maximize the economic return to their stockholders.  In considering
and engaging in these  transactions,  NBT and Pioneer  American  have taken into
account various  factors,  including  their  potential  strategic fit with these
institutions  based upon their businesses (both banking and non-banking),  their
management and employee  cultures,  and the  geographic  location and breadth of
their businesses.  In addition, in view of recent trends toward consolidation in
the  financial   services  industry   regionally  and  nationally,   the  senior
managements  of NBT and  Pioneer  American  have from time to time had  informal
discussions  with  senior  managements  of  other   comparably-sized   financial
institutions regarding potential business combination transactions. Prior to the
time when NBT and Pioneer  American  began their  initial  discussions,  NBT and
Pioneer American had never conducted discussions between themselves.

                                       55

<PAGE>


     Prior to its discussions with Lake Ariel, a bank holding company located in
Lake Ariel,  Pennsylvania,  which NBT acquired in February,  2000,  all of NBT's
previous  discussions to explore growth  opportunities  through  acquisitions of
branches and/or banks related to New York financial  institutions and during the
1997-1999  period had not  culminated  in an  acquisition  opportunity  that NBT
deemed of merit.  The Pioneer American Board had recognized the need for Pioneer
American  to be larger  in order to  respond  to the  demands  of the  financial
industry  market and to better compete  within the industry.  From time to time,
the Pioneer  American  Board has considered  acquisitions,  both as a seller and
buyer, but these  considerations had not materialized to the point where serious
potential transactions could be negotiated.

         In April 1999, the Pioneer American Board retained Danielson Associates
Inc.  ("Danielson  Associates") as a financial  advisor  relative to a potential
equal  merger  opportunity  with a local bank.  At about the same time,  Pioneer
American  received an  unsolicited  offer from another local bank, and Danielson
Associates was also asked to review this  unsolicited  offer and report on other
possible affiliations.  As a result of Danielson Associates' report, there was a
meeting with a third bank, a Philadelphia area bank, that had expressed interest
in buying Pioneer American.  After considerable discussion with Pioneer American
and  Danielson  Associates,  the  Philadelphia  area bank decided not to proceed
further.

         In May 1999,  Arnold G. Danielson of Danielson  Associates met with the
Board of Pioneer American to review the relative merits of the  above-referenced
unsolicited offer with a local bank, the equal merger opportunity from the other
local bank and continuing on as an independent  bank. While the Pioneer American
Board was of the opinion that  continuing on as an  independent  bank may not be
possible over the long-run, it also felt that the two affiliation considerations
at hand were not in the best interest of its  shareholders and the other parties
were informed of this decision.

     During  the  September  1,  1999,  meeting  of the NBT  Board,  there was a
discussion of the potential  opportunity to merge Pioneer American into NBT. The
concept would be to acquire Pioneer American and merge it with LA Bank to form a
large, locally managed,  community bank in northeastern  Pennsylvania.  The "new
bank" would be operated as a wholly owned  subsidiary of NBT. After  discussion,
the Board authorized Daryl R. Forsythe, President and Chief Executive Officer of
NBT, to pursue the opportunity.  In mid-September  1999, Mr. Forsythe  contacted
Arnold Danielson of Danielson Associates to express NBT's interest in increasing
its market share in northeastern  Pennsylvania  beyond the potential  created by
the pending Lake Ariel merger.

     In September 1999,  Pioneer American was approached by NBT as to a possible
affiliation,  which would increase NBT's coverage of  northeastern  Pennsylvania
beyond  what would be created  by its  pending  acquisition  of Lake  Ariel.  In
response to this inquiry,  the Pioneer American Board asked Danielson Associates
to  review  the pros and cons of a  possible  merger  with  NBT,  including  its
relative merits vis-a-vis other potential  affiliations,  and, as result of this
review, the Pioneer American Board authorized its president, John W. Reuther, to
pursue  discussions  with NBT and to further  evaluate  the  interests  of other
potential affiliation candidates.  As part of further evaluating the interest of
others,  the Pioneer  American Board directed that the local bank that had shown
an interest in affiliating with Pioneer American in the spring be given a chance
to improve its earlier offer.

     The local bank, upon  notification of a possible sale of Pioneer  American,
reaffirmed  its  earlier  interest.  This  resulted in a meeting  between  Board
members of the two banks and a presentation to Pioneer  American's  Board by the
investment banker for the local bank. A representative  of Danielson  Associates
also attended this meeting.

     Prior to this meeting,  the Pioneer American Board visited NBT headquarters
in  Norwich,  NY on October 6, 1999.  The purpose of the meeting was to meet Mr.
Forsythe and certain  members of the NBT  executive  management  team (Martin A.
Dietrich,  President  and Chief  Operating  Officer of NBT Bank;  Joe C.  Minor,
President  and Chief  Operating  Officer of NBT Financial  Services;  Michael J.
Chewens,  Executive  Vice  President  and Chief  Financial  Officer;  Jane Neal,
Executive  Vice  President and Director of Human  Resources and John D. Roberts,
Executive  Vice  President and Chief Trust  Officer) and to become more familiar
with NBT and its  markets.

     Between  September  28, 1999 and  mid-October  1999 the  parties  exchanged
financial information under a customary  confidentiality  agreement.  On October
19, 1999, Mr. Forsythe  visited Mr. Reuther in Carbondale to present a letter of
intent,  which outlined the general terms of a potential  affiliation  with NBT.
This  letter of intent was taken  under  consideration  by Mr.  Reuther  and the
Pioneer American Board.


     On  November 2, 1999,  Mr.  Forsythe  met with Mr.  Reuther and the Pioneer
American Board in Carbondale to clarify the terms of the letter of intent and to
offer to extend the letter of intent to  November  19,  1999,  to give the Board
more time to consider the NBT proposal. Several items were discussed,  including
the proposed  structure,  Board seats, deal parameters and growth  opportunities
that could result if the merger of LA Bank and Pioneer American with NBT were to
occur.

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     On November 4, 1999, Mr.  Forsythe sent Mr. Reuther a letter which extended
the  October  19,  1999 letter of intent to  November  19,  1999,  expanded  the
potential NBT Board seats to be offered to Pioneer  American  directors to three
and  adjusted  the  exchange  ratio to reflect the  recently  announced 5% stock
dividend.  The  letter  also  further  discussed  the  merits of the  merger and
presented Pioneer American with NBT's due diligence information request.

     On November 17, 1999, the Pioneer  American Board met to consider the offer
of NBT and  other  possibilities.  Mr.  Danielson  reviewed  the NBT  offer  and
discussed other possibilities, in general, including staying independent. It was
Pioneer  American's  investment  banker's opinion that, the NBT offer was a good
offer; there was no other bank likely to make an offer that was as favorable for
Pioneer   American   shareholders  as  the  offer  from  NBT;  Pioneer  American
shareholders  would be best served by an affiliation with a larger bank; NBT had
a better  historic  financial  performance;  greater stock  liquidity;  superior
technology and a more  diversified  product line than other sale  opportunities.
After  extensive  discussion,  the  Pioneer  American  Board  voted to pursue an
affiliation with NBT with the goal of arriving at a definitive agreement as soon
as possible.

     On  November  23,  1999 and  November  24,  1999,  Pioneer  American's  due
diligence team visited the corporate  office of NBT to perform the necessary due
diligence as suggested  by counsel and mandated by the Pioneer  American  Board.
Items reviewed were

     o    corporate documents;

     o    financial reports;

     o    regulatory and legal compliance reports;

     o    tax returns and related matters;

     o    board of directors and management information;

     o    transactions   between  directors,   officers,   employees  and  their
          affiliates;

     o    compensation    committee   interlocks   and   insider   participation
          information, personnel policies, procedures and benefits;

     o    schedule of office locations, facilities and related matters;

     o    lending activities;

     o    major non-performing asset and reserve policy information;

     o    lawsuits, assessments and claims;

     o    savings activities;

     o    insurance coverage;

     o    investment and liquidity policy; and

     o    various other matters.

     On November 22, 1999, the NBT due diligence team visited  Pioneer  American
in Scranton to perform its review,  which they  completed  on November 24, 1999.
The NBT team reviewed similar types of information as had Pioneer American.

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<PAGE>


     On November  26,  1999,  counsel for NBT,  Duane,  Morris & Heckscher  LLP,
distributed to the parties a first draft of the definitive  agreement for review
by both  parties.  The  parties  at this  time and  during  the  following  days
discussed  with their  respective  financial and legal advisors the terms of the
draft of the merger  agreement.  Each company  authorized  its legal  counsel to
discuss  revisions to the  agreement  with the intent of  expediting  the review
process.  Legal  counsel for NBT  circulated  a second  draft of the  definitive
agreement incorporating the negotiated revisions on December 4, 1999.

     The Pioneer  American Board held a special  meeting on December 7, 1999. At
the meeting,  Pioneer American's advisors reviewed the terms of the draft merger
agreement  and related  agreements,  including the stock option  agreement,  the
potential financial and strategic benefits of the transaction, and the financial
and valuation analysis of the proposed transaction.  The Board received a report
on the results of the due  diligence  review.  Counsel  described  the  exchange
ratio;  how it was  negotiated and the mechanisms for a termination in the event
of an extraordinary decline in the price of NBT stock. Danielson Associates Inc.
gave an analysis of the  transaction and delivered its opinion that the exchange
ratio  was  fair  from  a  financial   point  of  view  to  Pioneer   American's
stockholders.  The Pioneer American Board authorized the execution of the merger
agreement on the terms reviewed and discussed by the Pioneer American Board.

     The NBT Board convened a special meeting on December 7, 1999, to review the
Definitive Agreement negotiated with Pioneer American. David A. Budd and Michael
Rasmussen from McConnell,  Budd and Downes,  Inc., NBT's investment banker, were
present to go over the merger  highlights.  Brian  Alprin,  NBT's  counsel  from
Duane,  Morris & Heckscher  LLP, was present by telephone  and answered  several
legal questions  regarding the documents.  After discussion,  the Board approved
the agreement.

     Each company made a public announcement on December 8, 1999.

RECOMMENDATION OF THE NBT BOARD AND NBT'S REASONS FOR THE STOCK ISSUANCE AND THE
MERGER

     The NBT Board  believes that the issuance of its common stock to the former
Pioneer American stockholders upon completion of the merger and the terms of the
merger  agreement  are fair to,  and in the best  interests  of, NBT and the NBT
stockholders.  Accordingly,  the NBT Board has  unanimously  approved  the stock
issuance and the merger agreement and determined that the stock issuance and the
merger and the other matters contemplated in the merger agreement are advisable.
The NBT Board recommends  unanimously that NBT's  stockholders vote FOR approval
of the stock issuance and the ratification of the merger agreement.

     In reaching its determination and  recommendation,  the NBT Board consulted
with NBT's  management,  as well as its  financial  advisors,  legal counsel and
accountants,   and  considered  a  variety  of  factors.  The  material  factors
considered  by the  NBT  Board  in  reaching  the  foregoing  determination  and
recommendation,  all of which the NBT Board deemed  favorable,  are described as
follows:

     o    NBT's strategic expansion plans and acquisition objectives:

          o    its  growth  into new  markets,  in New York  and  other  states;
               further    extension   of   its   franchise   into   northeastern
               Pennsylvania's  largest metroplex  (Wilkes-Barre/Scranton),  thus
               building on the Lake Ariel acquisition, the effect of which would
               be  a  diversification  of  NBT's  banking  operations,  and  the
               anticipated   improved   stability  of  the  combined   company's
               businesses and earnings in varying  economic and market  climates
               relative  to NBT on a  stand-alone  basis  made  possible  by the
               merger as a result of substantially  greater geographic and asset
               diversification;

          o    expansion of its  opportunities for the delivery of its financial
               services,  especially its trust services, and the belief that the
               larger size of the  combined  company  would  place the  combined
               company in a stronger  position to satisfy the financial needs of
               its expanded customer base, with increased  product  capabilities
               and  services,  respond  to changes  affecting  the  banking  and


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<PAGE>

               financial services industries,  and compete more effectively with
               financial  institutions within its expanded  geographical service
               area;

          o    the  anticipated  financial  impact of the merger and  subsequent
               combination  with LA Bank to create the largest  locally  managed
               community  bank  in  northeastern  Pennsylvania  on the  combined
               company's future financial performance, including the expectation
               of the  NBT  Board  that  the  merger  will be  accretive  to the
               earnings of the  combined  company  within the first full year of
               operation;

          o    the  anticipated  effectiveness  of the merger in allowing NBT to
               enhance  stockholder  returns by achieving  efficiencies and cost
               savings  through  combining the two  Pennsylvania  banks into one
               large  community  bank,   thus   leveraging   NBT's   technology,
               management,  infrastructure,  products,  marketing,  and lines of
               business over a larger  customer  base,  and ongoing  operational
               cost savings,  including general and administrative  cost savings
               in   areas   such  as   information   and   accounting   systems,
               telecommunications   and   professional   fees,  and  operational
               efficiencies due to combining non-customer  operations and due to
               critical mass in areas such as bulk purchasing and insurance;

     o    the familiarity of the NBT Board with and review of Pioneer American's
          business, operations,  financial condition, earnings and prospects, as
          well as those of NBT; in making its determination,  the NBT Board took
          into  account  the  results of NBT's due  diligence  review of Pioneer
          American's business;

     o    the  knowledge  of the NBT  Board of the  current  financial  services
          industry environment,  characterized by rapid consolidation, increased
          opportunities  for  cross-industry   expansion,   evolving  trends  in
          technology,  and the need to  anticipate  and to best  position NBT in
          light of industry trends;

     o    the  complementary  nature of the  businesses  of NBT,  Lake Ariel and
          Pioneer  American,  and  the  compatibility  between  the  operational
          functions of the two  companies'  banking  subsidiaries,  NBT Bank, LA
          Bank and Pioneer American Bank, especially in commercial and community
          banking, asset management services,  automobile lending,  leasing, and
          mortgage  banking,  and the belief that the merger  should  enable the
          combined  company to achieve many of its long-range  goals more easily
          and with less risk than NBT could achieve without the merger;

     o    the financial terms of the merger and the belief of the NBT Board that
          the cost of the merger in  financial  terms  represents  a  reasonable
          investment by NBT in its determination to expand its banking franchise
          and the anticipated  value to be received by NBT and its  stockholders
          as a result of its investment in acquiring Pioneer American;

     o    the  likelihood  of the  merger  being  approved  by  the  appropriate
          regulatory authorities;

     o    the belief of the NBT Board that, while no assurances can be given, it
          was likely that the merger  would be  completed  and that the business
          and financial benefits  contemplated in connection with the merger are
          likely to be achieved within a reasonable time frame;

     o    the structure of the merger and the terms of the merger  agreement and
          the  option  agreement,  including  the fact that the  exchange  ratio
          provides  reasonable  certainty  as to the  number  of shares of NBT's
          common  stock NBT will issue in the merger  and that NBT  intends  the
          merger to  qualify  as a  transaction  of the type  that is  generally
          tax-free for federal income tax purposes and as a pooling of interests
          for accounting purposes;

     o    the opinion of McConnell,  Budd & Downes to the NBT Board that,  based
          on and subject to the  considerations  set forth in the  opinion,  the
          exchange  ratio  was fair  from a  financial  point of view to the NBT
          stockholders;

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<PAGE>


     o    consideration   of  the  effect  of  the  merger   upon  NBT's   other
          constituencies,  including the customers and communities served by NBT
          and its employees,  including management of NBT, and the fact that the
          merger  would allow the combined  company to continue its  significant
          presence in the regions currently served by NBT, including maintaining
          its headquarters in Norwich.

     NBT  does  not  intend  this  discussion  of the  information  and  factors
considered  by the NBT Board to be  exhaustive,  although this  discussion  does
include  all  material  factors  the  NBT  Board  considered.  In  reaching  its
determination  to  approve  and  recommend  the  merger  agreement  to  the  NBT
stockholders  for their  approval,  the NBT Board did not assign any relative or
specific weights to the various factors considered,  and individual directors of
NBT might have weighed factors differently.

RECOMMENDATION OF NBT'S BOARD OF DIRECTORS

     The NBT Board is unanimous in its recommendation that NBT stockholders vote
FOR approval of the issuance of its common stock to the former Pioneer  American
stockholders at the effective time of the merger and  ratification of the merger
agreement and the merger.

RECOMMENDATION  OF THE PIONEER  AMERICAN BOARD AND PIONEER  AMERICAN REASONS FOR
THE MERGER

     The Pioneer  American Board believes that the terms of the merger agreement
are fair and in the best interests of Pioneer American and its stockholders.  In
the course of reaching its  determination,  the Pioneer American Board consulted
with legal  counsel with respect to its legal duties and the terms of the merger
agreement.  The Pioneer American Board consulted with its financial advisor with
respect to the financial aspects of the transaction and fairness of the exchange
ratio from a  financial  point of view,  and with senior  management  regarding,
among other things, operations matters.

     The following  discussion of the information and factors  considered by the
Pioneer  American Board is not intended to be  exhaustive,  but does include all
material  factors  considered by the board.  In reaching its decision to approve
the merger agreement, the Pioneer American Board considered the following:

     o    NBT's  broader  range  of  products  and  services  that  will  become
          accessible to Pioneer American customers through the merger;

     o    Consideration  offered to Pioneer American shareholders in relation to
          the  market  value,  book  value,  earnings  per share  and  projected
          earnings per share of Pioneer American;

     o    The quality of NBT and its operating  history,  including its products
          and services;

     o    Historical  results of  operations,  current  financial  condition and
          future prospects of Pioneer American and NBT;

     o    The  presentation  by Danielson  Associates Inc. as to the fairness of
          the  exchange  ratio  provided  for in  the  merger  agreement  from a
          financial point of view to Pioneer American's stockholders;

     o    Current operating environment,  including the continued  consolidation
          and  increasing  competition  in the  banking and  financial  services
          industries and the prospect for further changes in these industries;

     o    The compatibility of the operating culture of NBT and Pioneer American
          in community banking;

     o    The results of the due diligence  investigations  of NBT undertaken by
          Pioneer American officers and  representatives  of Pioneer  American's
          financial advisor, including NBT's investment portfolio, loan

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<PAGE>


          portfolio  and  adequacy  of  loan  loss  reserves,  funds  management
          policies,  employee  benefit plans,  Year 2000 compliance  matters and
          audit procedures;

     o    Detailed financial  analysis,  pro forma, and other information,  with
          respect  to  Pioneer  American  and  NBT  discussed  by the  financial
          advisors;

     o    That NBT intends that John W. Reuther,  President and Chief  Executive
          Officer of Pioneer American and its subsidiary, Pioneer American Bank,
          would continue to function as President and Chief Executive Officer of
          the  subsidiary  bank until such time as NBT merges  Pioneer  American
          Bank  into  the  successor  entity  which  will  include  all  of  the
          northeastern  Pennsylvania operations,  at which time Mr. Reuther will
          become  President  and  Chief  Operating  Officer  of  that  successor
          wholly-owned  subsidiary of NBT,  thereby  promoting  continuity  with
          respect to the continuing operations of Pioneer American and providing
          valuable input into the market area served by Pioneer American;

     o    That three  representatives  of Pioneer  American's Board would become
          members of NBT's Board,  thereby promoting  continuity with respect to
          the continuing  operations of Pioneer American and providing  valuable
          input into the market area served by Pioneer American;

     o    Anticipated  cost savings and  efficiencies  available to the combined
          company as a result of the merger;

     o    Prospects for continued local identity; and

     o    Other terms of the merger  agreement and exhibits,  including that the
          transaction will be tax-free to Pioneer American and its shareholders.

     In  reaching  its   determination  to  approve  and  recommend  the  merger
agreement,  the Pioneer  American  Board did not assign any relative or specific
weights to the  foregoing  factors,  and  individual  directors may have weighed
factors differently.

RECOMMENDATION OF PIONEER AMERICAN'S BOARD OF DIRECTORS

     The  Pioneer  American  Board  believes  that  the  merger  is in the  best
interests of Pioneer  American and its  stockholders.  ACCORDINGLY,  THE PIONEER
AMERICAN BOARD IS UNANIMOUS IN ITS  RECOMMENDATION  THAT  STOCKHOLDERS  VOTE FOR
APPROVAL AND ADOPTION OF THE MERGER AGREEMENT.

MERGER CONSIDERATION

     In the merger, holders of Pioneer American common stock will receive shares
of NBT common stock as described in detail below.

     At the effective time of the merger each share of Pioneer  American  common
stock  issued  and  outstanding  immediately  prior to the  effective  time will
automatically  convert into and become the right to receive  1.805 shares of NBT
common stock.

     The merger agreement provides for adjustment of the exchange ratio:

     o    either upwards or downwards to adjust for any NBT or Pioneer  American
          stock dividends, split-ups, mergers, recapitalizations,  combinations,
          conversions, exchanges of shares or the like;

     o    upwards but not downwards if all of the following occur:

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<PAGE>


          (1)  the average price per NBT share during the 20-day  trading period
               ending on the eighth day prior to the day chosen as the effective
               date of the merger is less than  $15.00  and the NBT stock  price
               decline,  expressed as a  percentage,  is more than 15 percentage
               points  greater than the weighted  average stock price decline of
               the index group, and

          (2)  Pioneer  American  exercises  its right to cancel the merger as a
               result of such price  decline,  subject to NBT's right to require
               Pioneer American to complete the merger if NBT agrees to increase
               the exchange ratio so that a Pioneer  American  stockholder  will
               receive  at least  $27.08  worth of NBT  stock  for each  Pioneer
               American share, and

          (3)  NBT so elects to increase the exchange ratio.

     We have provided some examples of how these  termination  provisions  would
work using the stock  prices of NBT,  Pioneer  American,  and the index group on
December  7,  1999.  See "The  Issuance  of NBT  Common  Stock in the Merger and
Ratification of the Merger  Agreement -- Termination Upon a Decline in the Value
of NBT Common Stock."

     At the effective  time of the merger,  holders of Pioneer  American  common
stock will cease to be stockholders of Pioneer  American and will no longer have
any rights as Pioneer American stockholders, other than the right to receive any
dividend or other  distribution  with respect to Pioneer  American  common stock
with a record  date  occurring  prior to the  effective  time and to receive the
applicable  consideration in the merger. After the effective time, there will be
no transfers on Pioneer American's stock transfer books of any shares of Pioneer
American common stock.

OPINION OF NBT'S FINANCIAL ADVISOR

     On December 7, 1999, McConnell,  Budd & Downes, Inc. ("MB&D") delivered its
opinion to the NBT Board,  that as of that date,  the  exchange  ratio was fair,
from a  financial  point  of view to NBT  stockholders.  The  basis  for  MB&D's
opinion,  which is  unchanged,  has been  updated for the purposes of this joint
proxy  statement/prospectus  and appears in Appendix B. The  exchange  ratio was
negotiated based on consideration of numerous factors including the following:

     o    An analysis of the possible  future earnings per share results for the
          parties on both a combined and a stand-alone basis.

     o    Anticipated   dilutive  or  accretive   effects  of  the   prospective
          transaction to the earnings per share of NBT.

     o    Probable  impact  on  dividends  payout  ratio  as  a  result  of  the
          contemplated transaction.

     o    Loan  portfolios  and  relative  asset  quality  as  disclosed  by the
          parties.

     o    Adequacy of reserves for loan and lease losses of the parties.

          o    Composition of the deposit bases of each of the parties.

          o    Analysis of the  historical  trading range,  trading  pattern and
               relative liquidity of the common shares of each of the parties.

          o    Accounting   equity    capitalization,    the   tangible   equity
               capitalization  and  the  market  capitalization  of  each of the
               parties.

          o    Contemplation  of other  factors,  including  certain  intangible
               factors.

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<PAGE>


     MB&D has acted as  financial  advisor to NBT on a  contractual  basis since
October 20, 1994 in connection with NBT's development and  implementation of its
strategic plan and has assisted NBT in the  evaluation of numerous  hypothetical
affiliation  opportunities with banks, thrifts and other financial  institutions
since that date.  With  respect to the  pending  transaction  involving  Pioneer
American, MB&D advised NBT during the evaluation and negotiation process leading
up to the  execution of the merger  agreement  and provided NBT with a number of
analyses  as  to  a  range  of  financially   feasible   exchange  ratios.   The
determination of the applicable  exchange ratio was arrived at in an arms-length
negotiation  between NBT and Pioneer American in a process in which MB&D advised
NBT and participated directly in the negotiations.

     MB&D  was  retained  based  on its  qualifications  and  experience  in the
financial analysis of banking and thrift institutions  generally,  its knowledge
of the New York and Pennsylvania  banking markets in particular,  as well as its
experience  with  merger  and   acquisition   transactions   involving   banking
institutions.  As a part of its investment  banking  business,  which is focused
exclusively on financial  services  industry  participants,  MB&D is continually
engaged in the  valuation  of financial  institutions  and their  securities  in
connection  with  its  equity  brokerage  business  generally  and  mergers  and
acquisitions in particular.  Members of the Corporate  Finance Advisory Group of
MB&D have  extensive  experience in advising  financial  institution  clients on
mergers and  acquisitions.  In the  ordinary  course of its  business as an NASD
broker-dealer,  MB&D may, from time to time,  purchase  securities  from or sell
securities to NBT or Pioneer American and as a market maker in securities.  MB&D
may from time to time have a long or short  position in, and buy or sell debt or
equity  securities  of NBT or Pioneer  American  for its own  account or for the
accounts of its customers.  In addition, in the ordinary course of business, the
employees of MB&D may have direct or indirect  investments in the debt or equity
securities of either or both NBT or Pioneer American.

     The full text of the opinion,  which sets forth assumptions  made,  matters
considered and limits on the review  undertaken,  is attached hereto as Appendix
B. MB&D urges that all NBT shareholders read the opinion in its entirety and the
joint  proxy  statement/prospectus  in its  entirety.  The  opinion  of  MB&D is
directed only to the exchange ratio at which shares of Pioneer  American  common
stock may be exchanged for shares of NBT common stock.  The opinion of MB&D does
not constitute a recommendation to any holder of NBT common stock as to how such
holder should vote at the NBT annual meeting. The summary of the opinion and the
matters  considered  in  the  MB&D  analysis  set  forth  in  this  joint  proxy
statement/prospectus  is  qualified  in its entirety by reference to the text of
the opinion itself.  The opinion is necessarily  based upon conditions as of the
date of the opinion and upon information made available to MB&D through the date
thereof.  No limitations were imposed by the NBT Board upon MB&D with respect to
the investigations made, matters considered or procedures followed in the course
of rendering its opinions.

Materials Reviewed by MB&D:

     In connection with the rendering and updating of its opinion, MB&D reviewed
the following documents and considered the following subjects:

     o    The merger agreement detailing the pending transaction;

     o    The joint proxy  statement/prospectus  in substantially the form to be
          mailed to NBT shareholders;

     o    Pioneer  American  Annual Reports to  stockholders  for 1996, 1997 and
          1998;

     o    Pioneer American Annual Reports on Form 10-K for 1996, 1997 and 1998;

     o    Related  financial  information  for the three  calendar  years  ended
          December 31, 1996, 1997, and 1998 for Pioneer American;

                                       63

<PAGE>


     o    Pioneer American  Quarterly Report on Form 10-Q and related  unaudited
          financial information for the first three quarters of 1999;

     o    Pioneer American's press release concerning  unaudited results for the
          calendar years 1998 and 1999;

     o    NBT Annual Reports to Stockholders for 1996, 1997 and 1998;

     o    NBT Annual Reports on Form 10-K and related financial  information for
          the calendar years ended 1996, 1997 and 1998;

     o    NBT  Quarterly  Reports on Form 10-Q and related  unaudited  financial
          information for the first three quarters of 1999;

     o    NBT's press  release  concerning  unaudited  results for the  calendar
          years 1998 and 1999;

     o    Internal financial  information and financial  forecasts,  relating to
          the  business,  earnings,  cash  flows,  assets and  prospects  of the
          respective  companies  furnished  to MB&D by Pioneer  American and NBT
          respectively;

     o    Discussions with members of the senior  management of Pioneer American
          concerning  the past and  current  results  of  operations  of Pioneer
          American,  its current financial condition and management's opinion of
          its future prospects;

     o    Discussions  with members of the senior  management of NBT  concerning
          the past  and  current  results  of  operations  of NBT,  its  current
          financial condition and management's opinion of its future prospects;

     o    The historical record of reported prices,  trading volume and dividend
          payments for both Pioneer American and NBT common stock;

     o    Based  primarily on anecdotal  information,  the current  state of and
          future  prospects  for  the  economy  of  New  York  and  northeastern
          Pennsylvania  generally  and the  relevant  market  areas for  Pioneer
          American and NBT in particular;

     o    Specific  merger  analysis  models   developed  by  MB&D  to  evaluate
          potential business  combinations of financial  institutions using both
          historical  reported  information  and projected  information for both
          Pioneer  American  and NBT and the  results  of  application  of these
          models;

     o    The reported financial terms of selected recent business  combinations
          of financial  institutions  for purposes of  comparison to the pending
          transaction;

     o    Such other studies and analyses as MB&D considered  appropriate  under
          the circumstances associated with this particular transaction.

     The opinion of MB&D takes into account its assessment of general  economic,
market  and  financial  conditions  and its  experience  in  other  transactions
involving  participants  in the  financial  services  industry,  as  well as its
experience  in securities  valuation  and its knowledge of the banking  industry
generally.  For purposes of reaching  its  opinion,  MB&D has assumed and relied
upon the accuracy and  completeness  of the  information  provided to it or made
available by Pioneer American and NBT and does not assume any responsibility for
the  independent  verification  of such  information.  With respect to financial
forecasts  made  available to MB&D it is assumed by MB&D that they were prepared
on a reasonable  basis and reflect the best  currently  available  estimates and
good

                                       64

<PAGE>


faith judgments of the management of Pioneer American and NBT  respectively,  as
to the future performance of Pioneer American and NBT. MB&D has also relied upon
assurances  of the  management  of Pioneer  American  and NBT that they were not
aware  of any  facts  or of the  omission  of any  facts  that  would  make  the
information or financial forecasts provided to MB&D incomplete or misleading. In
the course of rendering  its opinion,  MB&D has not  completed  any  independent
valuation  or appraisal of any of the assets or  liabilities  of either  Pioneer
American or NBT and has not been  provided  with such  valuations  or appraisals
from any other source.

     The  following  is a summary of the material  analyses  employed by MB&D in
connection with rendering its written  opinion.  Given that it is a summary,  it
does not  purport  to be a complete  and  comprehensive  description  of all the
analyses  performed,  or an  enumeration  of every matter  considered by MB&D in
arriving at its opinion.  The preparation of a fairness opinion is a complicated
process,  involving a  determination  as to the most  appropriate  and  relevant
methods  of  financial  analysis  and the  application  of those  methods to the
particular circumstances.  Therefore, such an opinion is not readily susceptible
to a summary  description.  In arriving at its  fairness  opinion,  MB&D did not
attribute  any  particular  weight  to  any  one  specific  analysis  or  factor
considered by it and made  qualitative as well as  quantitative  judgments as to
the significance of each analysis and factor.  Therefore, MB&D believes that its
analyses must be considered as a whole and feels that  attributing  undue weight
to any  single  analysis  or factor  considered  could  create a  misleading  or
incomplete view of the process  leading to the formation of its opinion.  In its
analyses,  MB&D has made certain  assumptions  with respect to banking  industry
performance, general business and economic conditions and other factors, many of
which are beyond the control of  management of either  Pioneer  American or NBT.
Estimates,  which are referred to in the analyses are not necessarily indicative
of actual  values or  predictive  of future  results or  values,  which may vary
significantly from those set forth. In addition, analyses relating to the values
of  businesses do not purport to be appraisals or to reflect the prices at which
businesses might actually be sold. Accordingly,  such analyses and estimates are
inherently  subject to uncertainty and MB&D does not assume  responsibility  for
the accuracy of such analyses or estimates.

LAKE ARIEL TRANSACTION.

     On August 16, 1999, NBT agreed to acquire Lake Ariel Bancorp, Inc. MB&D has
reviewed the  agreement  with Lake Ariel and issued a fairness  opinion to NBT's
Board of Directors  concerning this  transaction.  MB&D acted as NBT's financial
advisor  throughout the  negotiations  with Lake Ariel.  The agreement with Lake
Ariel and the expected pro forma  financials  were  included in MB&D's  analysis
concerning the Pioneer American transaction.

Analysis of the Anticipated Merger and the Fixed Exchange Ratio:

     The  consideration of 1.805 shares of NBT common stock,  valued at the last
sale  price  of NBT on the day  prior  to the  announcement  of the  transaction
($16.25) represents the following values and multiples:

          Total Transaction Value:                                 $85,337,277
          Deal Premium to Pioneer American's last trade:           5.70%
          Deal Price / EPS for the last 12 months                  20.95x
          Deal Price / Tangible Book as of 9/30/99                 2.68x

Contribution Analysis:

     The following  table reflects the acquisition of Lake Ariel on February 17,
2000 and is based on reported  financial data for Pioneer American and NBT as of
September 30, 1999 and the per share price of NBT as of December 6, 1999.  Under
those circumstances,  the relative contributions of the parties to the pro forma
NBT on a pooling basis would have been as follows:

                                       65

<PAGE>


                          Pro Forma Contribution Table

                                  As of 9-30-99
<TABLE>
<CAPTION>
- -----------------------------------  -------------------------- ---------------------------
              Item                              NBT                  Pioneer American
- -----------------------------------  -------------------------- ---------------------------
<S>                                            <C>                         <C>
Proposed Ownership                             77.3%                       22.7%
- -----------------------------------  -------------------------- ---------------------------
Assets                                         82.1%                       17.9%
- -----------------------------------  -------------------------- ---------------------------
Loans                                          83.1%                       16.9%
- -----------------------------------  -------------------------- ---------------------------
Deposits                                       82.5%                       17.5%
- -----------------------------------  -------------------------- ---------------------------
Equity                                         83.6%                       16.4%
- -----------------------------------  -------------------------- ---------------------------
Tangible Equity                                83.1%                       16.9%
- -----------------------------------  -------------------------- ---------------------------
Estimated Net Income of Combined               80.7%                       19.3%
Company for fiscal year 2000.
- -----------------------------------  -------------------------- ---------------------------
Estimated Net Income of Combined               76.7%                       23.3%
Company for fiscal year 2001.
- -----------------------------------  -------------------------- ---------------------------
</TABLE>

Specific Acquisition Analysis:

     MB&D  employs  a  proprietary  analytical  model  to  examine  transactions
involving banking  companies.  The model uses forecast  earnings data,  selected
current  period  balance sheet and income  statement  data,  current  market and
trading  information  and a number  of  assumptions  as to  interest  rates  for
borrowed funds, the opportunity cost of funds, discount rates, dividend streams,
effective  tax rates and  transaction  structures.  The model  inquires into the
likely  economic  feasibility  of a given  transaction at a given price level or
specified exchange rate while employing a specified transaction  structure.  The
model also  permits  evaluation  of  various  levels of  potential  non-interest
expense   savings  which  might  be  achieved   along  with  various   potential
implementation  time  tables for such  savings,  as well as the  possibility  of
revenue enhancement opportunities which may arise in a given transaction.

     Utilizing  this model,  MB&D  prepared pro forma  analyses of the financial
impact of the merger to the NBT stockholders.  MB&D compared  estimated earnings
per share of NBT on a stand alone  basis for fiscal year 2000,  2001 and 2002 to
the estimated  earnings per share of the common stock of the combined company on
a pro forma basis for the same fiscal years.  MB&D's analysis  illustrates  that
the merger  will be  dilutive to  stockholders  of NBT on an earnings  per share
basis in fiscal year 2000, and becomes  accretive to NBT  stockholders in fiscal
year 2001. The  transaction  remains  accretive to stockholders of NBT in fiscal
year 2002.

Analysis of Other Comparable Transactions:

     MB&D  is  reluctant  to  place  emphasis  on  the  analysis  of  comparable
transactions as a valuation  methodology due to what it considers to be inherent
limitations of the application of the results to specific  cases.  MB&D believes
that such analysis fails to adequately take into consideration such factors as:

     o    Material   differences  in  the  underlying   capitalization   of  the
          comparable institutions which are being acquired;
     o    Differences in the historic  earnings (or loss)  patterns  recorded by
          the compared institutions which can depict a very different trend than
          might be implied by examining only recent financial results;
     o    Failure  to exclude  non-recurring  profit or loss items from the last
          twelve months'  earnings streams of target companies which can distort
          apparent earnings multiples;
     o    Material  differences  in the form or forms of  consideration  used to
          complete the transaction;
     o    Differences between the planned method of accounting for the completed
          transaction;
     o    Factors  such as:  the  relative  population,  business  and  economic
          demographics  of  the  acquired   entity's   markets  as  compared  or
          contrasted  to  such  factors  for the  markets  in  which  comparable
          companies are doing business.

                                       66

<PAGE>


     With  these  reservations  in  mind,  we  nonetheless  examined  statistics
associated with 46 transactions  (excluding the subject  transaction)  involving
commercial banks. The following criteria was utilized to create the sample:

     o    Acquired institutions are all commercial banks.
     o    Announced between June 1, 1998 and December 7, 1999.
     o    Announced  deal  value  greater  than $50  million  and less than $100
          million.

     The table which follows  permits a comparison of the mean and median values
for two selected  statistics arising from the list of 46 transactions  evaluated
with  the  "comparable"  statistics  calculated  for the  transaction  which  is
described in this joint proxy statement/prospectus.

              "Comparable" statistics as of the announcement date:

<TABLE>
<CAPTION>
- --------------------------------------- --------------------------------------- ---------------------------------------
          Compared statistics                    Announced transaction               Announced transaction price/
                                               price/tangible book value              trailing 12 months earnings
- --------------------------------------- --------------------------------------- ---------------------------------------
<S>                                                      <C>                                     <C>
NBT/Pioneer American                                     2.68x                                   20.95x
- --------------------------------------- --------------------------------------- ---------------------------------------
Sample (46 transactions)
                 Mean                                    3.07x                                   24.5x
                Median                                   3.08x                                   21.7x
- --------------------------------------- --------------------------------------- ---------------------------------------
1999 (29 transactions)
                 Mean                                    2.96x                                   23.7x
                Median                                   2.85x                                   21.5x
- --------------------------------------- --------------------------------------- ---------------------------------------
1998 (17 transactions)
                 Mean                                    3.23x                                   26.0x
                Median                                   3.19x                                   23.7x
- --------------------------------------- --------------------------------------- ---------------------------------------
PA, NJ & NY (8 transactions)
                 Mean                                    3.02x                                   26.6x
                Median                                   2.93x                                   25.0x
- --------------------------------------- --------------------------------------- ---------------------------------------
</TABLE>


COMPENSATION OF MB&D

     Pursuant to a letter  agreement with NBT dated December 7, 1999,  MB&D will
receive a fixed fee of $375,000. This fee will be divided into several payments,
which  correspond with the successful  completion of specific  events.  MB&D was
paid $75,000  after the  execution of the merger  agreement  and will be paid an
additional  $150,000  upon  issuance of its opinion which will be included as an
exhibit to this joint proxy statement/prospectus.  Payment of the balance of the
fee will be conditioned on closing of the transaction.

     The fee payable to MB&D represents  compensation  for services  rendered in
connection  with  the  analysis  of  the   transaction,   participation  in  the
negotiations,  participation  in the  drafting  of  documentation,  and  for the
rendering of its Opinion. In addition,  NBT has agreed to reimburse MB&D for its
reasonable  out-of-pocket  expenses incurred in connection with the transaction.
NBT also has agreed to indemnify MB&D and its directors,  officers and employees
against certain losses,  claims,  damages and liabilities relating to or arising
out of its engagement, including liabilities under the federal securities laws.

     MB&D has filed a written  consent with the SEC relating to the inclusion of
its  fairness  opinion  and the  reference  to such  opinion  and to MB&D in the
registration  statement  in  which  this  joint  proxy  statement/prospectus  is
included.  In giving such  consent,  MB&D did not admit that it comes within the
category of persons whose consent is required  under Section 7 of the Securities
Act of 1933 or the rules and  regulations  of the SEC  thereunder,  nor did MB&D
thereby admit that it is an expert with respect to any part of such Registration
Statement within the

                                       67

<PAGE>


meaning of the term "expert" as used in the  Securities  Act of 1933 as amended,
or the rules and regulations of the SEC thereunder.

OPINION OF PIONEER AMERICAN'S FINANCIAL ADVISOR

     Pioneer   American   retained   Danielson   Associates   Inc.   ("Danielson
Associates") to advise the Pioneer  American board of directors as to its "fair"
sale value and the fairness to its  shareholders  of the financial  terms of the
offer to be acquired by NBT.  Danielson  Associates is regularly  engaged in the
valuation of banks, bank holding  companies,  and thrifts in the connection with
mergers,  acquisitions, and other securities transactions; and has knowledge of,
and  experience  with,  Pennsylvania  and New York  banking  markets and banking
organizations  operating in those markets.  Danielson Associates was selected by
Pioneer  American because of its knowledge of, expertise with, and reputation in
the financial services industry.

     In such capacity,  Danielson  Associates reviewed the merger agreement with
respect to the  pricing and other terms and  conditions  of the merger,  but the
decision as to accepting the offer was ultimately made by the board of directors
of Pioneer  American.  Danielson  Associates  rendered  its oral  opinion to the
Pioneer American board of directors, which it subsequently confirmed in writing,
that as of the date of the opinion,  the  financial  terms of the NBT offer were
"fair" to Pioneer American and its shareholders.  No limitations were imposed by
the Pioneer  American Board of Directors upon Danielson  Associates with respect
to the  investigation  made or  procedures  followed  by it in  arriving  at its
opinion.

     In arriving at its opinion, Danielson Associates

     o    reviewed  certain  business  and  financial  information  relating  to
          Pioneer  American and NBT including annual reports for the fiscal year
          ended  December 31, 1998;  call report data from 1990 to 1999; and the
          Annual Reports on Form 10-K and the Quarterly Reports on Form 10-Q for
          1998 and 1999;

     o    discussed  the past and current  operations,  financial  condition and
          prospects of NBT with its senior executives;

     o    analyzed  the pro forma  impact of the  merger on NBT's  earnings  per
          share, capitalization, and financial ratios;

     o    reviewed the reported  prices and trading  activity for the NBT common
          stock and compared it to similar bank holding companies;

     o    reviewed and  compared the  financial  terms,  to the extent  publicly
          available, with comparable transactions;

     o    reviewed the merger agreement and certain related documents; and

     o    considered such other factors as were deemed appropriate.

     Danielson Associates did not obtain any independent  appraisal of assets or
liabilities  of  Pioneer  American  or NBT  or  their  respective  subsidiaries.
Further,  Danielson  Associates  did not  independently  verify the  information
provided by Pioneer American or NBT and assumed the accuracy and completeness of
all such information.

     In arriving at its  opinion,  Danielson  Associates  performed a variety of
financial  analyses.  Danielson  Associates  believes  that its analyses must be
considered as a whole and that  consideration of portions of such analyses could
create an incomplete view of Danielson Associates' opinion. The preparation of a
fairness opinion is

                                       68

<PAGE>


a  complex  process  involving  subjective  judgments  and  is  not  necessarily
susceptible to partial analysis or summary description.

     In its analyses, Danielson Associates made certain assumptions with respect
to industry  performance,  business and economic conditions,  and other matters,
many of which were beyond  Pioneer  American's or NBT's  control.  Any estimates
contained in Danielson Associates analyses are not necessarily indicative of the
future results of value,  which may be significantly more or less favorable than
such  estimates.  Estimates  of the  value of  companies  do not  purport  to be
appraisals  or  necessarily  reflect  the  prices  at which  companies  or their
securities may actually be sold.

     The  following is a summary of selected  analyses  considered  by Danielson
Associates in connection with its opinion letter.

Pro Forma Merger Analyses

     Danielson  Associates  analyzed  the changes in the amount of earnings  and
book value  represented  by the  receipt of about  $87.5  million for all of the
outstanding  shares of Pioneer  American  common  stock and  options to purchase
common stock,  which will be paid in NBT common stock or options to purchase NBT
common stock. The analysis evaluated,  among other things,  possible dilution in
earnings and capital per share for NBT common stock.

Comparable Companies

     To determine  the "fair" value of the NBT common stock to be exchanged  for
the common stock of Pioneer American, NBT was compared to eleven publicly-traded
bank holding companies  ("comparable banks" or the "comparative  group").  These
comparable  banks  had  assets  in  the  $1  billion  to $3  billion  range,  no
extraordinary  characteristics  and were  located  in New  Jersey,  New York and
Pennsylvania.

                   Summary and Description of Comparable Banks
                   -------------------------------------------

                                    Assets*              Headquarters
                                    -------              ------------
                                   (in mill.)
Comparable Banks**
- ----------------
  Community Bank System              $1,774              DeWitt, N.Y.
  Harleysville National               1,615              Harleysville, Pa.
  Main Street                         1,403              Reading, Pa.
  National Penn                       2,252              Boyertown, Pa.
  Omega                               1,058              State College, Pa.
  Premier National                    1,591              Lagrangeville, N.Y.
  Sterling Financial                  1,040              Lancaster, Pa.
  TrustCo                             2,385              Schenectady, N.Y.
  U.S.B.                              1,629              Orangeburg, N.Y.
  United National                     2,053              Bridgewater, N.J.
  Yardville                           1,056              Mercerville, N.J.

*    September 30, 1999.
**   Publicly-traded  with  assets  between  $1  billion  and $3  billion in New
     Jersey, New York and Pennsylvania.

Source: SNL Securities LC, Charlottesville, Virginia.

                                       69

<PAGE>


     Danielson Associates compared NBT's

     o    stock price as of December  6, 1999 equal to 11.8 times  earnings  and
          171% of book;

     o    dividend  yield based on trailing  four  quarters as of September  30,
          1999 and stock price as of December 6, 1999 of 4.06%;

     o    equity as of September 30, 1999 of 9.28% of assets;

     o    nonperforming  assets including loans 90 days past due as of September
          30, 1999 equal to .27% of total assets;

     o    return on average  assets  during the  trailing  four  quarters  ended
          September 30, 1999 of 1.44% and

     o    return on average  equity  during the same period of 14.62%,  with the
          medians for the comparable banks.

     The comparable medians were

     o    stock price equal to 14.0 times earnings and 196% of book;

     o    dividend yield of 3.29%;

     o    equity of 6.40% of assets;

     o    .35% of assets nonperforming;

     o    return on average assets of 1.22% and

     o    return on average equity of 14.98%.

     Danielson Associates also compared other income,  expense and balance sheet
information of such companies with similar information about NBT.

                         NBT - Comparable Banks Summary
                         ------------------------------
<TABLE>
<CAPTION>
                                                               Comparable Banks
                                              NBT                  Medians
                                              ---              ----------------
<S>                                        <C>                    <C>
Income
- ------
  Net income/Avg. Assets                       1.444%                  1.22 %
  Net oper. income*/Avg. Assets                2.45                    2.047
  Return on average equity                    14.62                   14.98

Balance Sheet
- -------------
  Equity/Assets                                9.28 %                  6.40 %
  NPAs**/Assets                                 .27                     .35

Stock Price
- -----------
  Price/Earnings                              11.8  X                 14.0  X
  Price/Book                                 171    %                196    %
  Dividend yield                               4.06 %                  3.29 %
  Payout ratio                                45    %                 46    %
  Shares traded***                         9,786                  11,440
</TABLE>

*    Net interest income plus noninterest income less operating expense.
**   Nonperforming assets including loans 90 days past due and still accruing.
***  Average daily volume in 1999 through December 6, 1999.

Source: SNL Securities LC, Charlottesville, Virginia.


                                       70

<PAGE>


Comparable Transaction Analysis
- -------------------------------

     Danielson Associates compared the consideration to be paid in the merger to
the latest twelve months  earnings and equity  capital of Pioneer  American with
earnings and capital multiples paid in acquisitions of banks through December 6,
1999 in Connecticut,  New Jersey, New York and Pennsylvania.  Of these, the most
applicable  recent  transactions  included Hudson United  Bancorp's  purchase of
JeffBanks,  Inc.,  NBT Bancorp Inc.'s  acquisition of Lake Ariel Bancorp,  Inc.,
Staten Island Bancorp,  Inc.'s purchase of First State Bancorp, Summit Bancorp's
acquisition  of NMBT Corp.,  Tompkins  Trustco,  Inc.'s  purchase of  Letchworth
Independent  Bankshares Corporation and Webster Financial Corp.'s acquisition of
New England Community  Bancorp,  Inc. At the time Danielson  Associates made its
analysis,  the  consideration  to be  paid in the  merger  was  274% of  Pioneer
American's  September 30, 1999 book value and 21.3 times  reported  earnings for
the trailing four quarters as of September 30, 1999. This compares to the median
multiples  of 251% of book  value  and  23.0  times  earnings  for the six  most
applicable recent transactions.

Discounted Future Earnings and Discounted Dividends Analysis
- ------------------------------------------------------------

     Danielson   Associates   applied  present  value  calculations  to  Pioneer
American's  estimated future earnings and dividend stream under several specific
growth and earnings  scenarios.  This analysis  considered,  among other things,
scenarios  for Pioneer  American as an  independent  institution  and as part of
another  banking  organization.  The  projected  dividend  streams and  terminal
values, which were based on a range of earnings multiples,  were then discounted
to present value using discount  rates based on assumptions  regarding the rates
of return required by holders or prospective  buyers of Pioneer  American common
stock.

Other Analysis
- --------------

     In  addition  to  performing  the  analyses  summarized  above,   Danielson
Associates also  considered the general market for bank mergers,  the historical
financial  performance of Pioneer American and NBT, the market positions of both
banks and the general economic conditions and prospects of those banks.

     No company or transaction  used in this composite  analysis is identical to
Pioneer  American  or  NBT.  Accordingly,  an  analysis  of the  results  of the
foregoing is not  mathematical;  rather it involves  complex  consideration  and
judgments concerning  differences in financial and operating  characteristics of
the companies and other factors that could affect the public  trading  values of
the company or companies to which they are being compared.

     The summary  set forth above does not purport to be a complete  description
of the analyses and procedures  performed by Danielson  Associates in the course
of  arriving at its  opinions.  In payment  for its  services  as the  financial
advisor to Pioneer American, Danielson Associates is to be paid an estimated fee
of about $437,500, based upon a fee equal to 0.5% of the total transaction price
at the time of closing, reduced by any hourly fees already received.

     The full text of the opinion of Danielson  Associates dated as of March 10,
2000,  which sets forth  assumptions  made and matters  considered,  is attached
hereto as Appendix C of this joint proxy statement/prospectus.  Pioneer American
shareholders  are  urged  to  read  this  opinion  in  its  entirety.  Danielson
Associates' opinion is

                                       71

<PAGE>


directed  only  to  the   consideration  to  be  received  by  Pioneer  American
shareholders  in the  merger and does not  constitute  a  recommendation  to any
Pioneer  American  shareholder  as to how such  shareholder  should  vote at the
Shareholders Meeting.

OTHER INTERESTS OF OFFICERS AND DIRECTORS IN THE MERGER

     In considering  the  independent  recommendations  of the NBT Board and the
Pioneer American Board with respect to the merger, Pioneer American stockholders
should be aware that officers and directors of Pioneer  American have  interests
in the merger that are  different  from, or in addition to, the interests of the
stockholders  of  Pioneer  American  generally.  The NBT Board  and the  Pioneer
American  Board were aware of such interests and  considered  them,  among other
matters,  in approving the merger agreement and the matters  contemplated by the
merger agreement, including the merger.

     As of December 31, 1999,  the directors  and executive  officers of Pioneer
American owned an aggregate of approximately  482,385 shares of Pioneer American
common stock and held options to purchase an aggregate of  approximately  45,125
shares of Pioneer  American common stock at a weighted average exercise price of
approximately  $11.35.  Under  the  terms  of  the  merger  agreement,   Pioneer
American's  directors and executive officers will receive the same consideration
for their shares of Pioneer  American common stock as the other Pioneer American
stockholders. Upon completion of the merger, all outstanding options to purchase
Pioneer  American  common stock will convert into options to purchase  shares of
NBT  common  stock.  See "The  Issuance  of NBT  Common  Stock in the Merger and
Ratification of the Merger Agreement -- Pioneer American Stock Options."

     Reuther  Employment  Agreement.  NBT, as the surviving  corporation  in the
merger, will enter into an employment agreement with John W. Reuther,  President
and Chief Executive Officer and a director of Pioneer American,  under which NBT
will cause Pioneer American Bank, which will be a wholly-owned subsidiary of NBT
following the merger, to employ Mr. Reuther as its President and Chief Operating
Officer or as the  President  and Chief  Operating  Officer of the  northeastern
Pennsylvania operations of its successor entity. In carrying out his duties, Mr.
Reuther  will  report  to  the  Chairman  and  Chief  Executive  Officer  of the
northeastern  Pennsylvania  operations  of NBT and will  oversee  and direct the
operations of Pioneer American Bank or the northeastern  Pennsylvania operations
of any successor  entity to Pioneer  American  Bank.  The  employment  agreement
becomes effective when the merger is completed and terminates three years later.

     Mr. Reuther's  employment  agreement provides that he will receive a salary
of not less than  $230,000 per year,  subject to increases  in  accordance  with
NBT's  compensation  policies.  During the employment  term, Mr. Reuther will be
entitled  to  participate  in all of the  compensation  and  benefit  plans made
available  generally  to  senior  executives  of  NBT.  During  the  term of Mr.
Reuther's employment,

     o    he will be  entitled  to the use of an  automobile  owned  by  Pioneer
          American  Bank or  successor,  the  make,  model  and  year  of  which
          automobile is appropriate to an officer of Mr. Reuther's rank employed
          by NBT or its affiliates;

     o    NBT or an affiliate  of NBT will  reimburse  Mr.  Reuther for dues and
          assessments  incurred  by him in  relation  to his  membership  at his
          country club; and

     o    NBT or an affiliate of NBT will  maintain the life  insurance  paid by
          Pioneer  American  Bank or  successor  on Mr.  Reuther's  life for the
          benefit of his designated  beneficiary(ies)  at no less than the level
          of insurance maintained as of September 30, 1999.

In addition,  NBT will assume and continue in effect with respect to Mr. Reuther
the Pioneer American Bank Executive Retirement Plan, dated October 25, 1988, and
the Split Dollar  Agreement/Key  Executive  Equity  Program,  dated February 15,
1994,  as restated  April 16, 1999.  In return,  Mr.  Reuther has  renounced any
entitlement  to benefits under any  supplemental  executive  retirement  plan to
which he would otherwise be entitled as an executive or

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affiliate of NBT.  Additionally,  Mr.  Reuther will be eligible to be considered
for  performance  bonuses of up to 75% of salary,  primarily on the basis of the
performance  of  Pioneer  American  Bank  or of  the  northeastern  Pennsylvania
operations of any successor  entity to Pioneer American Bank, and secondarily on
the basis of the  performance  of NBT. The benefits  described in this paragraph
will continue throughout the employment term unless NBT terminates Mr. Reuther's
employment for cause, Mr. Reuther  terminates the agreement without good reason,
or Mr.  Reuther dies or becomes  disabled.  Mr. Reuther will agree that from the
commencement  date of his employment  agreement until the second  anniversary of
the  termination  date of the  agreement he will not compete  with NBT,  Pioneer
American Bank, or their  affiliates  within a composite area defined by radii of
25 miles from the head office of Pioneer American Bank, the authorized  branches
of Pioneer American Bank as they may exist from time to time, and each branch of
a depository  institution  affiliated  with Pioneer  American Bank for which Mr.
Reuther has or has had significant executive or managerial responsibilities.

     Releases. At the effective time of the merger, Messrs. Reuther and James E.
Jackson,  Executive Vice President of Pioneer American Bank, and Ms. Patricia A.
Cobb,   Executive  Vice  President  of  Pioneer   American  Bank,  will  execute
unconditional  releases in favor of NBT,  Pioneer  American and Pioneer American
Bank from any claims,  actions,  or liabilities they,  respectively,  might have
against NBT,  Pioneer  American or Pioneer  American  Bank.  In exchange for the
releases, NBT will tender to each a change-in-control agreement, and in the case
of Mr.  Reuther,  in addition an  employment  agreement,  described in preceding
paragraphs.

     Change-in-Control   Agreements.  NBT  has  entered  into  change-in-control
agreements with Messrs. Reuther and Jackson and Ms. Cobb. Each of the agreements
has a term  of  three  years,  which  extends  for an  additional  year  on each
successive anniversary of the agreement.  The agreements provide that if, within
24 months from the date of an event constituting a change in control of NBT, the
employment  of the  named  employee  is  terminated  (1) by NBT  because  of the
employee's  disability,  (2) by NBT without  cause,  or (3) by the employee with
good reason (as defined  below),  the terminated  employee will be entitled to a
severance payment and other benefits.  If terminated because of disability,  the
employee will be entitled to receive benefits in accordance with NBT's long-term
disability  income  insurance  plan.  If  terminated  without cause or with good
reason,  NBT  will  pay the  terminated  employee  his  full  base  salary  plus
year-to-date accrued vacation through the date of termination plus severance pay
in an amount equal to the product of his base salary  multiplied by 2.99, in the
case of Mr.  Reuther,  or 2.0, in the cases of Mr.  Jackson and Ms.  Cobb.  Base
salary means the  employee's  average  annual  compensation  includible in gross
income for federal income tax purposes for the five years  preceding the year in
which the change in control occurs.

     The  agreement  further  provides  that,  in the event that any payments or
benefits  the named  executive  becomes  entitled to under the  agreement or any
other payments or benefits  received or to be received by the named executive in
connection with a change in control of NBT or the named executive's  termination
of  employment  will be  subject  to an  excise  tax under  section  4999 of the
Internal  Revenue Code of 1986,  NBT will pay the named  executive an additional
amount so that the net amount retained by the named  executive,  after deduction
of the  excise  tax on the  severance  benefits  and  after  deduction  for  the
aggregate  of any federal,  state,  or local income tax and excise tax upon such
additional  payment  amount,   will  equal  the  severance  payments  under  the
change-in-control agreement.

     A change in control of NBT means:

     o    a change in control  that would be required to be reported in response
          to Item 6(e) of  Schedule  14A of  Regulation  14A as in effect on the
          date of the agreement under the Securities  Exchange Act of 1934, upon
          a person's  becoming  the  beneficial  owner (as defined in Rule 13d-3
          under the Exchange Act), directly or indirectly, of 30 percent or more
          of the combined voting power of NBT's voting securities;

     o    during any period of two  consecutive  years,  individuals  who at the
          beginning of such period constitute the NBT Board cease for any reason
          to constitute at least a majority of the Board unless the election, or
          the  nomination  for  election  by the NBT  stockholders,  of each new
          director was

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<PAGE>


          approved by a vote of at least  two-thirds of the directors then still
          in office who were directors at the beginning of the period;

     o    there shall be consummated any consolidation or merger of NBT in which
          NBT is not the continuing or surviving corporation or any sale, lease,
          exchange, or other transfer of all, or substantially all of the assets
          of NBT; or

     o    approval by the  stockholders  of NBT of any plan or proposal  for the
          liquidation or dissolution of NBT.

     The  change  in  control   agreements  define   termination  for  cause  as
termination  because,  and only because,  the named employee committed an act of
fraud,  embezzlement,  or theft  constituting  a felony or an act  intentionally
against the interests of NBT which causes NBT material injury.

     Termination of the named employee for good reason means:

     o    a change in the employee's  status or  position(s)  with NBT, which in
          the  employee's  reasonable  judgment,  does not represent a promotion
          from the employee's status or position as in effect  immediately prior
          to the  change in  control,  or a change in the  employee's  duties or
          responsibilities  which,  in the employee's  reasonable  judgment,  is
          inconsistent  with such  status or  position,  or any  removal  of the
          employee from, or any failure to reappoint or reelect the employee to,
          such position;

     o    a  reduction  by  NBT in  the  employee's  base  salary  as in  effect
          immediately prior to the change in control;

     o    the failure by NBT to continue in effect any employee  benefit plan in
          which the  employee  was  participating  at the time of the  change in
          control of NBT other than as a result of the normal  expiration of the
          plan in  accordance  with its  terms as in  effect  at the time of the
          change in control, or the taking of any action, or the failure to act,
          by  NBT  which  would  adversely   affect  the  employee's   continued
          participation  in the  plan on at least  as  favorable  a basis to the
          employee  as is the case on the date of the change in control or which
          would  materially  reduce the employee's  benefits in the future under
          any of the plans or  deprive  the  employee  of any  material  benefit
          enjoyed by the employee at the time of the change in control;

     o    the failure by NBT to provide and credit the employee  with the number
          of paid  vacation  days to which the  employee  was then  entitled  in
          accordance with NBT's normal vacation policy as in effect  immediately
          prior to the change in control;

     o    NBT's requiring the employee to be based anywhere other than where his
          office is located  immediately prior to the change in control,  except
          for required business travel;

     o    NBT's  failure to obtain  from any  successor  its  express  assent to
          assume and agree to perform  the  change in control  agreement  in the
          same manner and to the same extent as NBT would be required to perform
          if no succession had taken place;

     o    any purported termination by NBT of the employee's employment which is
          not effected in accordance  with the express notice  provisions of the
          change in control agreement; or

     o    any  refusal by NBT to  continue  to allow the  employee  to attend to
          matters or engage in activities  not directly  related to the business
          of NBT  which,  prior to the  change  in  control,  the  employee  was
          permitted by the board to attend or engage in.

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     Stock Options.  Options to purchase  Pioneer  American common stock,  which
their holders have not exercised  prior the effective  time of the merger,  will
automatically  convert  into  options to purchase  shares of common stock of NBT
following the merger,  and NBT will assume each such option subject to the terms
and conditions set forth in Pioneer American's stock option plans.

     Each such converted stock option will convert into a replacement  option to
acquire a number of shares of NBT common  stock  equal to  (rounded  down to the
nearest  whole  number of shares)  (a) the number of shares of Pioneer  American
common  stock  subject  to  such  converted  option  as of  the  effective  time
multiplied  by (b) the exchange  ratio for the merger.  The  exercise  price per
share  (rounded  down to the nearest  whole  cent) will equal (x) the  aggregate
exercise  price  under  such  converted  option for all of the shares of Pioneer
American  common stock subject to such  converted  option at the effective  time
divided  by (y) the  number  of  shares  of NBT  common  stock  subject  to such
replacement option.

     Each Pioneer American option will, in accordance with its terms, be subject
to further adjustment as appropriate to reflect any stock split, stock dividend,
recapitalization,  or other  similar  transaction  with  respect to NBT's common
stock on or subsequent to the completion of the merger.

     We describe the  treatment of options more fully under "The Issuance of NBT
Common Stock in the Merger and  Ratification of the Merger  Agreement -- Pioneer
American Stock Options."

     Composition of NBT's Board  Following the Merger.  Following the merger and
assuming the  election of the nominees  proposed to be elected at the NBT annual
meeting, NBT will have a Board of Directors composed of fifteen individuals. The
Board will include the twelve current members of the NBT Board,  including three
former Lake Ariel Board members,  Messrs.  John G. Martines,  Bruce D. Howe, and
William C. Gumble who joined the NBT Board upon completion of the merger between
NBT and Lake  Ariel that  closed on  February  17,  2000 and  Messrs.  Joseph G.
Nasser, Gene E. Goldenziel and Richard  Chojnowski,  each of whom is currently a
director of Pioneer  American.  The merger  agreement  provides that these three
individuals will become directors of NBT.

     Directors  and Officers  Indemnification.  As described in "The Issuance of
NBT Common  Stock in the  Merger and  Ratification  of the Merger  Agreement  --
Conduct of Business Pending  Completion of the Merger --  Indemnification,"  the
merger  agreement  provides that following the merger NBT will take no action to
abrogate  or  diminish  any  right to  indemnification  accorded  under  Pioneer
American's  Articles of Incorporation or bylaws existing in favor of the current
or former directors or officers of Pioneer  American.  The merger agreement also
provides  that  following  the  effective  time of the  merger and to the extent
permitted by law, all rights to such  indemnification will survive completion of
the merger,  and NBT will honor such  obligations in accordance with their terms
with respect to events, acts, or omissions occurring prior the effective time of
the merger.

STOCK OPTION AGREEMENT

     The  following is a description  of the material  terms of the stock option
agreement.  We urge all  stockholders  of NBT and  Pioneer  American to read the
stock option  agreement in its entirety for a complete  description of the terms
of the agreement.  We have previously filed a copy of the stock option agreement
with the SEC.

     As a condition  to NBT's  willingness  to enter into the merger  agreement,
Pioneer American entered into the Stock Option  Agreement,  dated as of December
7, 1999, with NBT. Under the stock option  agreement,  Pioneer  American granted
NBT an option to purchase up to 569,997 shares of Pioneer American common stock,
which was approximately 19.9% of the number of shares of Pioneer American common
stock outstanding as of December 7, 1999. The exercise price of the stock option
is $24.00 per share, subject to adjustment under specified circumstances.

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<PAGE>


     Parties to merger  agreements  often  enter into  arrangements  such as the
stock option agreement in connection with corporate  mergers and acquisitions in
an effort to increase  the  likelihood  of  completion  of the  transactions  in
accordance  with their terms,  and to compensate the recipient of the option for
its efforts and expenses,  losses and  opportunity  costs in connection with the
transactions  if the merger  does not occur due to  circumstances  involving  an
acquisition or potential  acquisition of the option issuer by a third party. The
stock  option  agreement  may have the  effect of  discouraging  offers by third
parties to acquire Pioneer American prior to the merger even if such persons are
prepared to pay more than the current market price of the shares of NBT's common
stock to be received by the  stockholders  of Pioneer  American  pursuant to the
merger agreement.

     The stock  option  will  become  exercisable  in whole or in part only if a
triggering event occurs with respect to Pioneer American before the stock option
terminates.  For purposes of the stock option  agreement,  the term  "triggering
event"  means  any of the  following  events  or  transactions  occurring  after
December 7, 1999:

     o    Pioneer  American or Pioneer  American Bank,  without having  received
          NBT's prior written  consent,  shall have entered into an agreement to
          engage in an  acquisition  transaction  (as  defined  below)  with any
          person other than NBT or any of its subsidiaries;

     o    any person other than NBT or NBT Bank shall have  acquired  beneficial
          ownership or the right to acquire  beneficial  ownership of 10 percent
          or more of the outstanding shares of Pioneer American's common stock;

     o    the stockholders of Pioneer American shall have voted on and failed to
          approve  the  merger  agreement  at a  special  meeting  held for that
          purpose or any adjournment or postponement of the meeting, if prior to
          the meeting  there was a public  announcement  that any person  (other
          than NBT or NBT Bank)  shall have made a bona fide  proposal to engage
          in an acquisition transaction;

     o    Pioneer American's Board shall have withdrawn or modified (or publicly
          announced its  intention to withdraw or modify) in any manner  adverse
          to NBT its  recommendation  that the  stockholders of Pioneer American
          approve the  transactions  contemplated  by the merger  agreement,  or
          Pioneer  American  or Pioneer  American  Bank  shall have  authorized,
          recommended  or proposed  (or  publicly  announced  its  intention  to
          authorize,  recommend  or  propose)  an  agreement  to  engage  in  an
          acquisition transaction with any person other than NBT or NBT Bank;

     o    any  person  other  than NBT or NBT Bank  shall  have made a bona fide
          proposal  to  Pioneer  American  or its  stockholders  to engage in an
          acquisition  transaction  and there was a public  announcement of such
          proposal;

     o    any  person  other  than NBT or NBT Bank  shall  have  filed  with the
          Securities and Exchange Commission a registration  statement or tender
          offer  materials with respect to a potential  exchange or tender offer
          that would constitute an acquisition transaction;

     o    Pioneer  American  shall have  breached  any  covenant  or  obligation
          contained in the merger  agreement in  anticipation  of engaging in an
          acquisition  transaction  with any person  other than NBT or NBT Bank,
          and  following  such breach,  NBT would be entitled to  terminate  the
          merger  agreement  as  provided  by  section  11.2(b)  of  the  merger
          agreement; or

     o    any person other than NBT or NBT Bank shall have filed an  application
          or notice with the  Federal  Reserve  Board or other  federal or state
          bank regulatory or antitrust  authority,  which  application or notice
          such authority has accepted for processing,  for approval to engage in
          an acquisition transaction.

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<PAGE>


     The stock option agreement defines the term acquisition  transaction as any
transaction  under which a person  proposes to or will acquire a majority of the
stock of, merge or consolidate  with, or acquire all or substantially all of the
assets of Pioneer  American or Pioneer American Bank, or otherwise engage in any
substantially  similar  transaction  with Pioneer  American or Pioneer  American
Bank.

     The stock option will terminate upon the earliest to occur of:

     o    completion of the merger;

     o    termination  of the merger  agreement  in  accordance  with its terms,
          except a termination  by NBT due to a breach by Pioneer  American of a
          representation,  warranty  or  covenant  or  a  termination  due  to a
          determination  in good faith by the  Pioneer  American  Board,  on the
          advice of counsel,  that the  termination  is required for the Pioneer
          American Board to comply with its fiduciary duties to its stockholders
          imposed by law by reason of a proposal  by a person  other than NBT or
          NBT Bank to  acquire  more than one  percent of the  Pioneer  American
          common stock; or

     o    passage of eighteen months after  termination of the merger  agreement
          following the two excepted events cited in the item above.

     Upon  the  occurrence  of a  triggering  event  that  occurs  prior  to the
termination  of the stock option,  NBT will have  registration  rights under the
Securities  Act with  respect  to the shares of Pioneer  American  common  stock
issued or issuable under the stock option.

     The  stock  option  agreement  also  provides  that at any time  after  the
occurrence  of a repurchase  event (as defined  below),  upon  request,  Pioneer
American will  repurchase  the stock option from the holder of the stock option.
The  purchase  price of the  repurchase  will  equal  the  amount  by which  the
market/offer  price  exceeds the stock option price  multiplied by the number of
shares then subject to the stock option.  To the extent NBT previously  acquired
shares of Pioneer  American  common stock upon the exercise of part of the stock
option,  Pioneer American will repurchase such shares at the market/offer price.
The term market/offer price means the highest of the following:

     o    the  highest  price  per  share  paid  by  any  person  that  acquires
          beneficial  ownership  of 50% or more of the Pioneer  American  common
          stock;

     o    the price per share of Pioneer  American  common  stock that any third
          party is to pay under an agreement with Pioneer American in connection
          with the repurchase event;

     o    the highest  closing price per share of Pioneer  American common stock
          within the six-month period immediately preceding the date that notice
          to repurchase is given; or

     o    in the  event of a sale of all or a  substantial  portion  of  Pioneer
          American's or Pioneer American Bank's net assets or deposits,  the sum
          of the net price  paid for such  assets or  deposits  and the  current
          market  value  of  the  remaining  net  assets  (as  determined  by  a
          nationally  recognized investment banking firm), divided by the number
          of shares of Pioneer American common stock  outstanding at the time of
          such sale.

     The stock option agreement defines repurchase event as

     o    the  acquisition by any third party of beneficial  ownership of 50% or
          more of the then outstanding shares of Pioneer American's common stock
          or

     o    the  consummation of an acquisition  transaction (as defined above) by
          any person other than NBT or NBT Bank.

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<PAGE>


     Under the terms of the stock option agreement, if, prior to the termination
of the stock option,  Pioneer  American or Pioneer  American Bank enters into an
extraordinary transaction,  such as a merger, consolidation or agreement to sell
all or substantially all of its assets or deposits, in which Pioneer American or
Pioneer American Bank is effectively not the surviving  corporation,  the holder
of the stock  option may  convert or  exchange  the stock  option into or for an
option  with  terms  similar to those of the stock  option  being  converted  or
exchanged  to purchase  stock of the entity that is the  effective  successor to
Pioneer American or Pioneer American Bank.

     The stock option agreement  generally provides that neither NBT nor Pioneer
American may assign any of its respective  rights or obligations under the stock
option  agreement  without  the  express  written  consent  of the other  party.
However,  if a triggering  event occurs before  termination of the stock option,
NBT may,  subject to limitations,  assign its rights and  obligations  under the
stock option in whole or in part. However,  until fifteen days after the Federal
Reserve Board has approved an application by NBT under the Bank Holding  Company
Act of 1956 to acquire the option  shares,  NBT may not assign its rights  under
the NBT option except in one of the following ways:

     o    a widely dispersed public distribution;

     o    a  private  placement  in which no one  party  acquires  the  right to
          purchase in excess of 2% of the voting shares of Pioneer American;

     o    an assignment to a single party (e.g., a broker or investment  banker)
          for  the  sole  purpose  of  conducting  a  widely   dispersed  public
          distribution on NBT's behalf; or

     o    any other manner approved by the Federal Reserve Board.

     To the best knowledge of Pioneer  American and NBT, no event giving rise to
any rights to  exercise  the stock  option has  occurred  as of the date of this
joint proxy statement/prospectus.

ACCOUNTING TREATMENT

     We expect  the merger to be  accounted  for as a pooling  of  interests  in
accordance with generally accepted accounting  principles  ("GAAP").  Under this
method of accounting, NBT stockholders and Pioneer American stockholders will be
deemed to have combined their existing  voting stock  interests by virtue of the
exchange  of shares of Pioneer  American  common  stock for shares of NBT common
stock. Accordingly,  the book value of the assets, liabilities and stockholders'
equity of each of NBT and Pioneer  American,  as  reported  on their  respective
consolidated  balance sheets,  will be carried over to the consolidated  balance
sheet of the combined  company,  and no goodwill  will be created.  The combined
company will be able to include in its  consolidated net income the combined net
income of both  companies for the entire fiscal year in which the merger occurs.
However, the combined company must treat certain expenses incurred to effect the
merger as current charges against income.

     It is a condition to  consummation  of the merger that NBT receive a letter
from its independent  auditor that the merger qualifies for pooling of interests
accounting  treatment.  See "The  Issuance of NBT Common Stock in the Merger and
Ratification of the Merger Agreement -- Conditions to Complete the Merger."

     As  described  in "Rights of  Dissenting  Stockholders,"  Pioneer  American
stockholders  have a right to dissent  to the merger and to receive  cash in the
exercise of their  dissenters'  rights.  If such cash paid  combined  with other
pooling of interests  violations exceed 10% of the outstanding shares of Pioneer
American  common  stock,  the merger will not  qualify for pooling of  interests
accounting treatment.

     The parties have  prepared the unaudited  pro forma  financial  information
contained  in  this  joint  proxy  statement/prospectus  using  the  pooling  of
interests accounting method to account for the merger. See "Summary --

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<PAGE>


Selected  Historical  and Pro Forma  Combined  Financial  Data" and  "Summary --
Unaudited Comparative Per Share Data."

DISSENTERS' OR APPRAISAL RIGHTS

     Holders of NBT common stock are not entitled to  dissenters'  and appraisal
rights under Delaware law in connection with the merger. Under Pennsylvania law,
Pioneer American  stockholders are entitled to dissenters'  rights in connection
with the merger.  See "Rights of Dissenting  Stockholders"  and  "Comparison  of
Stockholders' Rights -- Appraisal/Dissenters' Rights."

INCLUSION OF NBT'S COMMON STOCK ON NASDAQ NATIONAL MARKET

     A condition to the merger  requires  that the Nasdaq shall have  authorized
the shares of NBT common  stock to be issued in the merger for  inclusion on the
Nasdaq  National  Market.  NBT's common  stock is listed on the Nasdaq  National
Market  under  the  symbol  "NBTB."  Upon  completion  of the  merger,  we  will
deregister the Pioneer American common stock under the Securities  Exchange Act.
See "Price Range of Common Stock and Dividends."

DIVIDENDS

     NBT, as the  surviving  corporation,  expects that after  completion of the
merger,  subject to approval and  declaration by its Board, it will continue its
current dividend policy and declare regularly scheduled quarterly cash dividends
and annual stock  dividends on the shares of its common  stock  consistent  with
past practices.  The current  annualized rate of cash dividends on the shares of
NBT common stock is $0.68 per share.

     Pioneer  American  expects  to  continue  to  declare  regularly  scheduled
dividends  on the  Pioneer  American  common  stock  until  the  merger  closes,
including  regular  quarterly cash dividends of $0.20 per share,  subject to the
terms of the merger  agreement.  The right of holders of Pioneer American common
stock to receive dividends from Pioneer American will end upon the completion of
the merger when the separate corporate existence of Pioneer American will cease.
See "Price Range of Common Stock and Dividends."

     The merger  agreement  provides that after the date of the merger agreement
NBT and Pioneer  American will coordinate with each other the declaration of any
dividends with respect to NBT common stock and Pioneer  American common stock as
well as the record dates and payment dates of any dividends.

EXCHANGE OF PIONEER AMERICAN CERTIFICATES

     Promptly  after the  effective  time,  NBT will  deposit  with the exchange
agent,   American  Stock  Transfer  and  Trust  Company,  New  York,  New  York,
certificates  representing  the shares of NBT common  stock that are issuable in
connection with the merger for shares of Pioneer American common stock. NBT will
also deposit with the exchange agent an estimated amount of cash payable instead
of fractional  shares.  Promptly  after the effective  time,  NBT will cause the
exchange  agent to send to each  holder of record of shares of Pioneer  American
common stock at the effective time of the merger  transmittal  materials for use
in the  exchange  of the  merger  consideration  for  certificates  representing
Pioneer  American common stock.  NBT will deliver to holders of Pioneer American
common stock who surrender their  certificates  to the exchange agent,  together
with  properly   executed   transmittal   materials   and  any  other   required
documentation,  certificates  representing  the  number of shares of NBT  common
stock to which such  holders  are  entitled.  NBT will not issue any  fractional
shares.  Instead,  NBT will pay each holder of Pioneer American common stock who
would otherwise be entitled to a fractional  share of NBT common stock an amount
in cash,  without  interest,  calculated  by  multiplying  such  fraction by the
average of the closing  bid price and the closing  asked price per share for NBT
common  stock as  reported  on the  Nasdaq  Stock  Market for each of the twenty
consecutive  trading days ending on and including the eighth  trading day before
the effective time of the merger.

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     Until  properly  surrendering  their  certificates,  holders of unexchanged
shares of Pioneer  American  common  stock will not be  entitled  to receive any
dividends or distributions  with respect to NBT common stock. After surrender of
the certificates  representing  Pioneer American common stock, the record holder
of such  shares  will be  entitled  to  receive  any  such  dividends  or  other
distributions,  without  interest,  which had  previously  become  payable  with
respect to shares of NBT common stock represented by such certificate.

     HOLDERS OF PIONEER  AMERICAN  COMMON STOCK SHOULD NOT SEND IN  CERTIFICATES
REPRESENTING  PIONEER  AMERICAN  COMMON  STOCK  UNTIL THEY  RECEIVE  TRANSMITTAL
MATERIALS FROM THE EXCHANGE AGENT.

PIONEER AMERICAN STOCK OPTIONS

     At the effective  time, NBT will assume the former  Pioneer  American stock
option  plans.  At  the  effective  time  of the  merger,  all  outstanding  and
unexercised  Pioneer  American stock options will no longer represent a right to
acquire shares of Pioneer  American common stock but will convert  automatically
into  options to  purchase  shares of NBT common  stock.  NBT will  assume  such
Pioneer  American  stock options  subject to the terms and conditions of Pioneer
American  stock  option or similar  plans and related  option  agreements  as in
effect  immediately  prior to the effective  time under which  Pioneer  American
issued the assumed stock options.

     After the effective time of the merger,  the number of shares of NBT common
stock  purchasable  upon exercise of any such Pioneer American option will equal
the  number of shares of Pioneer  American  common  stock that were  purchasable
under such Pioneer  American  option  immediately  prior to the  effective  time
multiplied by the exchange ratio  established  for the merger,  rounding down to
the nearest whole share.  The per share  exercise  price under each such Pioneer
American stock option,  rounding down to the nearest whole cent,  will equal the
aggregate exercise price under the stock options divided by the number of shares
of NBT common stock  issuable  under the assumed  Pioneer  American stock option
plans.  The  duration  and  other  terms of each new NBT  stock  option  will be
substantially the same as the prior Pioneer American stock option.  The terms of
each  Pioneer  American  option  will  be  subject  to  further   adjustment  as
appropriate  to reflect any stock split,  stock  dividend,  recapitalization  or
other  similar  transaction  with  respect to NBT  common  stock on or after the
effective time of the merger.

REPRESENTATIONS AND WARRANTIES

     The merger agreement  contains  representations  and warranties made by NBT
and/or Pioneer American relating to the following matters:

     o    due organization,  corporate power, good standing and due registration
          as a bank holding company
     o    capitalization
     o    subsidiaries
     o    corporate  power and authority to conduct  business,  own property and
          enter  into the  merger  agreement,  the stock  option  agreement  and
          related transactions
     o    non-contravention of certain organizational  documents,  agreements or
          governmental  orders o reports and other  documents filed with the SEC
          and certain bank holding company and bank regulatory authorities,  and
          the accuracy of the information contained in the documents
     o    financial statements
     o    examinations by bank regulatory agencies
     o    undisclosed liabilities
     o    litigation and regulatory action
     o    compliance with laws
     o    contractual defaults
     o    brokers and financial advisers
     o    tax and accounting matters
     o    insurance
     o    labor matters

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     o    environmental matters
     o    absence of certain material changes and events
     o    required regulatory approvals
     o    loans and non-performing and classified assets
     o    allowances for loan losses
     o    administration of fiduciary accounts
     o    Year 2000 readiness
     o    deposit insurance

CONDUCT OF BUSINESS PENDING COMPLETION OF THE MERGER

     The merger agreement  contains various covenants and agreements that govern
Pioneer  American's  and NBT's actions  prior to the  effective  time of merger,
including the following:

     Conduct  of  Business.  Pioneer  American  has agreed  that it and  Pioneer
American  Bank  will  conduct  their   respective   businesses   diligently  and
substantially  in  the  same  manner  as  previously  and  to  use  commercially
reasonable  efforts to preserve  intact  their  business  organizations,  and to
maintain  their  existing  relations  with  customers,  employees  and  business
associates.

     Capital Stock.  Pioneer  American has agreed to restrictions on its ability
to authorize,  issue or make any  distribution of its capital stock or any other
securities, or grant any options to acquire additional securities, or declare or
distribute any stock dividend or authorize a stock split.  Pioneer  American has
agreed  not to make  any  direct  or  indirect  redemption,  purchase  or  other
acquisition  of its capital  stock.  Pioneer  American has further agreed not to
take any action  which would  prevent or impede the merger from  qualifying  for
pooling of interests accounting.

     Dividends.  Pioneer  American has agreed not to declare or pay any dividend
other than (i) customary  periodic cash  dividends  paid by Pioneer  American to
holders of its common stock in amounts not exceeding $0.20 per calendar  quarter
and at intervals  that are not shorter than past  practice,  and (ii)  customary
cash  dividends  paid by Pioneer  American  Bank whose amounts have not exceeded
past  practice and at  intervals  that are not shorter  than past  practice.  In
addition,  Pioneer  American  has agreed  that it will  coordinate  with NBT the
declaration of any dividends with respect to Pioneer  American  common stock and
the record dates and payment dates of such dividends.

     Compensation;  Employment  Agreements;  Benefit Plans. Pioneer American has
agreed not to:

     o    increase  the rate of  compensation  of any employee or enter into any
          agreement to increase the rate of compensation of any employee, except
          for increases in the ordinary  course of business in  accordance  with
          past  practices,  which  together  with all  other  compensation  rate
          increases do not exceed 4.5 percent per annum of the aggregate payroll
          as of September 30, 1999, and except as explicitly contemplated by the
          merger agreement; nor

     o    create or modify any pension or profit sharing plan,  bonus,  deferred
          compensation,  death  benefit,  or  retirement  plan,  or the level of
          benefits  under any such plan,  nor increase or decrease any severance
          or  termination  pay benefit or any other  fringe  benefit,  except as
          required by law; nor

     o    enter into any  employment  or  personal  services  contract  with any
          person  or  firm,  except  directly  to  facilitate  the  transactions
          contemplated by the merger agreement.

     Dispositions,  Acquisitions and Capital Expenditures.  Pioneer American has
agreed not to:

     o    either (i) merge into,  consolidate with, or sell or otherwise dispose
          of its assets to any other  corporation  or person,  or enter into any
          other  transaction or agree to effect any other transaction not in the
          ordinary  course of its  business  or (ii)  engage in any  discussions
          concerning such a

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          possible transaction unless the Pioneer American Board, based upon the
          advice of its  counsel,  determines  in good faith that such action is
          required for the Pioneer  American  Board to comply with its fiduciary
          duties to stockholders imposed by law; nor

     o    incur  any   liability  or   obligation,   make  any   commitment   or
          disbursement,  acquire or dispose of any  property or asset,  make any
          contract  or  agreement,  pay or become  obligated  to pay any  legal,
          accounting,   or  miscellaneous   other  expense,  or  engage  in  any
          transaction,  except  in the  ordinary  course of its  business  or to
          accomplish the transactions contemplated by the merger agreement; nor

     o    subject any of its  properties or assets to any lien,  claim,  charge,
          option, or encumbrance, other than in the ordinary course of business;
          nor

     o    enter into or assume any commitment to make capital expenditures,  any
          of which individually exceeds $20,000 or which in the aggregate exceed
          $50,000.

     Amendments. The merger agreement provides that neither Pioneer American nor
Pioneer American Bank will amend its respective  charter or bylaws,  nor convert
the charter or form of entity of Pioneer American Bank.

     Preservation of Business.  Pioneer  American has agreed that it and Pioneer
American Bank will:

     o    carry on  their  business  and  manage  their  assets  and  properties
          diligently  and  substantially  in  the  same  manner  as  before  the
          execution of the merger agreement;

     o    maintain the ratio of their loans to their  deposits at  approximately
          the same level as existed at September  30, 1999, as adjusted to allow
          for seasonal  fluctuations  of loans and deposits of a kind and amount
          experienced traditionally by them;

     o    manage their investment portfolio in substantially the same manner and
          under  substantially the same investment policies as in 1997 and 1998,
          and take no action to change to any  material  extent  the  percentage
          which their  investment  portfolio bears to their total assets,  or to
          lengthen  to  any  material  extent  the  average  maturity  of  their
          investment  portfolio,   or  of  any  significant  category  of  their
          portfolio;

     o    use  commercially  reasonable  efforts  to  continue  in effect  their
          present insurance coverage on all properties,  assets,  business,  and
          personnel;

     o    use  commercially   reasonable  efforts  to  preserve  their  business
          organization intact, to keep available their present employees, and to
          preserve their present  relationships with customers and others having
          business dealings with them;

     o    not do anything and not fail to do anything  which will cause a breach
          of or default in any contract, agreement, commitment, or obligation to
          which they are a party or by which they may be bound; and

     o    conduct their affairs so that at the effective time of the merger none
          of their  representations  and warranties will be inaccurate,  none of
          their covenants and agreements  will be breached,  and no condition in
          the  merger  agreement  will  remain  unfulfilled  by  reason of their
          actions or omissions.

     Acquisition  Proposals.  Pioneer  American and Pioneer  American  Bank have
agreed that they will not

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     o    solicit any inquiries or proposals to acquire more than one percent of
          Pioneer American common stock or any capital stock of Pioneer American
          Bank or any significant portion of the assets of either of them;

     o    afford any third party  which may be  considering  such a  transaction
          access to its  properties,  books or  records  except as  required  by
          mandatory provisions of law;

     o    enter into any  discussions  or  negotiations  for,  or enter into any
          agreement or understanding which provides for such a transaction; or

     o    authorize  or permit  any of its  directors,  officers,  employees  or
          agents  to do or  permit  any of the  activities  referred  to in this
          paragraph.

     Pioneer American,  however,  may participate in discussions or negotiations
with,  or furnish  information  to, any person if, after  consultation  with and
consideration  of the  advice of outside  counsel,  its board of  directors  has
determined in good faith that such action is required for the board of directors
to comply  with its  fiduciary  duty to  stockholders  imposed  by law.  Pioneer
American  has  agreed  to keep  NBT  informed  of the  status  and all  material
information regarding any such discussions or negotiations.

     Employee  Benefit  Matters.  Employees  of  Pioneer  American  and  Pioneer
American Bank who become  participants in any employee benefit plans of NBT will
receive credit for prior service with Pioneer  American or Pioneer American Bank
for  purposes of  eligibility  and vesting as long as such  crediting of service
does not result in  duplication  of benefits.  If  necessary,  NBT has generally
agreed,  subject to certain exceptions,  to cause the waiver of any pre-existing
condition  limitations and eligibility  waiting periods under group health plans
with respect to such participants and their eligible dependents.

     Termination  Benefits and  Severance  Obligations.  NBT has agreed that any
employee of Pioneer American or Pioneer American Bank who becomes an employee of
NBT or any of its subsidiaries  immediately  following the effective time of the
merger whose  employment is terminated  subsequent to the effective time will be
entitled to  severance  pay, if any, in  accordance  with the general  severance
policy of NBT.

     Regulatory  Applications and Filings.  NBT and Pioneer American have agreed
that they will  cooperate  and use their best  efforts to effect all filings and
obtain  all  necessary   government   approvals  to  complete  the  transactions
contemplated by the merger agreement.

     Indemnification.  The merger  agreement  provides that, after the effective
time of the merger,  NBT will take no action to  abrogate or diminish  any right
accorded under the Articles of  Incorporation  or bylaws of Pioneer  American as
they existed  immediately  prior to the effective  time to any person who, on or
prior to the effective  time,  was a director or officer of Pioneer  American to
indemnification  from or against losses,  expenses,  claims,  demands,  damages,
liabilities,  judgments,  fines, penalties, costs, expenses, and amounts paid in
settlement pertaining to or incurred in connection with any threatened or actual
action,  suit, claim, or proceeding  (whether civil,  criminal,  administrative,
arbitration,  or  investigative)  arising  from  events,  matters,  actions,  or
omissions  occurring  on or prior to the  effective  time of the merger.  To the
extent permitted by law, all rights to such  indemnification  accorded under the
Articles of  Incorporation  and bylaws of Pioneer American to any person who, on
or prior to the effective  time,  was a director or officer of Pioneer  American
will  survive  the  effective  time and,  following  the  merger,  to the extent
permitted by law, NBT will honor such obligations in accordance with their terms
with respect to events,  acts,  or omissions  occurring  prior to the  effective
time.

     Post-Closing  Governance.  NBT has agreed that three members of the Pioneer
American Board will become  members of the NBT Board,  with Mr. Joseph Nasser to
serve in the class whose term expires in 2003,  Mr. Gene E.  Goldenziel to serve
in the class whose term expires in 2001, and Mr. Richard  Chojnowski to serve in
the class whose term expires in 2002.  See "The  Companies -- NBT  Following the
Merger."

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     Certain Other Covenants.  The merger agreement  contains other covenants of
the parties relating to:

     o    the    preparation    and    distribution    of   this   joint   proxy
          statement/prospectus;

     o    the respective NBT and Pioneer American stockholders' meetings and the
          recommendations of the respective boards of directors;

     o    cooperation in issuing public announcements;

     o    access to information;

     o    confidentiality;

     o    inclusion of the NBT common stock issuable to the holders of shares of
          Pioneer  American  common  stock for  trading on the  Nasdaq  National
          Market; and

     o    the delivery of financial statements of Pioneer American to NBT.

CONDITIONS TO COMPLETE THE MERGER

     The obligations of each of NBT and Pioneer  American to complete the merger
are subject to the satisfaction or waiver, subject to compliance with applicable
law, of conditions, including:

     o    obtaining  the  requisite   votes  of  approval  from  the  respective
          stockholders of Pioneer American and NBT;

     o    obtaining all governmental approvals required to complete the merger;

     o    obtaining all other  necessary  third party  consents and approvals to
          complete the merger;

     o    the  absence  of  injunctions,  decrees,  orders,  laws,  statutes  or
          regulations enjoining,  preventing or making illegal the completion of
          the merger;

     o    the declaration of effectiveness of the registration statement on Form
          S-4 by the  SEC and the  absence  of any  stop  order  or  proceedings
          seeking a stop order;

     o    the  delivery of an opinion to NBT and Pioneer  American to the effect
          that the merger will be treated for federal  income tax  purposes as a
          reorganization  within the meaning of Section  368(a) of the  Internal
          Revenue Code;

     o    the approval for  inclusion on the Nasdaq  National  Market of the NBT
          common  stock  issuable  to  Pioneer  American's  stockholders  in the
          merger; and

     o    the receipt by NBT of an opinion from its independent  auditor stating
          that the  merger  qualifies  for  "pooling  of  interests"  accounting
          treatment.

     The obligations of each of NBT and Pioneer  American to complete the merger
are further subject to satisfaction or waiver of the following conditions:

     o    the  representations  and  warranties of the other party in the merger
          agreement  are to be  materially  true and correct as of the effective
          time of the merger,  except for representations and warranties made as
          of a  specified  date  which  will  be  true  and  correct  as of such
          specified date;

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<PAGE>


     o    all of the agreements and covenants of the other party to be performed
          and complied with on or prior to the effective  time of the merger are
          to have been performed and complied with in all material respects; and

     o    each of NBT and  Pioneer  American is to have  received a  certificate
          dated the effective time of the merger signed by designated  executive
          officers  of the  other  party  to  the  effect  that  the  above  two
          conditions have been satisfied.

TERMINATION AND TERMINATION FEES

     General  Termination Rights. The parties may terminate the merger agreement
at any time prior to the effective time, whether before or after approval by the
Pioneer American stockholders or NBT stockholders:

     o    by mutual written consent of the parties;

     o    by either NBT or Pioneer American if any of the following occurs:

          (1)  the merger has not been completed by July 31, 2000, except to the
               extent that the failure to complete  the merger  results from the
               failure of the party  seeking  termination  to perform or observe
               the  agreements  and  covenants  of  such  party  in  the  merger
               agreement;

          (2)  the  Pioneer  American  stockholders  fail to approve  the merger
               agreement at the Pioneer American special meeting;

          (3)  the NBT stockholders  fail to approve the merger agreement at the
               NBT annual meeting;

          (4)  the NBT stockholders  shall have voted on and failed to approve a
               proposed   amendment  to  NBT's   Certificate  of   Incorporation
               increasing  the number of  authorized  shares of NBT common stock
               from fifteen million to thirty million; or

          (5)  any governmental entity has issued a final,  non-appealable order
               denying an approval or consent  that is required to complete  the
               merger.

     o    by Pioneer American if any of the following occur:

          (1)  the   material   incorrectness   when   made  of  any  of   NBT's
               representations and warranties;

          (2)  a material  breach or a material  failure by NBT of its covenants
               under the merger  agreement,  and NBT has not cured the breach or
               failure; or

          (3)  if the  Pioneer  American  Board,  based  upon the  advice of its
               counsel, determines in good faith that termination is required in
               order  for the  Board to  comply  with its  fiduciary  duties  to
               stockholders  imposed by law by reason of having  received from a
               third  party a proposal  to acquire  more than one percent of the
               Pioneer  American  common  stock or any capital  stock of Pioneer
               American Bank or any significant portion of the assets of Pioneer
               American or Pioneer American Bank.

     o    by NBT if either of the following occurs:

          (1)  the material incorrectness when made of any of Pioneer American's
               representations and warranties; or

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<PAGE>


          (2)  a material  breach or a material  failure by Pioneer  American of
               its covenants under the merger  agreement,  and Pioneer  American
               has not cured the breach or failure.

     Termination  Upon a  Decline  in the  Value of NBT  Common  Stock.  Pioneer
American has the right to cancel the merger if:

     o    the price of a share of NBT common stock declines below $15.00 and

     o    the NBT stock price decline,  expressed as a percentage,  is more than
          15  percentage  points  greater than the weighted  average stock price
          decline of the index group.

The price per NBT share of $15.00  represents a 10.45%  decline in the price per
NBT share of $16.75 which is the share price used by NBT and Pioneer American in
their negotiation of the merger agreement.  Even if both of these two conditions
are present and Pioneer American  decides to cancel the merger,  NBT can require
Pioneer  American to complete the merger by  increasing  the number of shares of
NBT common  stock to be issued to  Pioneer  American's  stockholders,  so that a
Pioneer American stockholder will receive at least $27.08 worth of NBT stock for
each share of Pioneer American common stock.

     In order to determine the price and percentage  decline in the value of the
NBT common stock and of the weighted  average stock price of the index group, we
will take the  average  of the  closing  bid and asked  prices per share for NBT
common  stock  and for the  companies  in the  index  group  for  each of the 20
consecutive  trading days ending on the eighth trading day before the day chosen
to be the effective date of the merger.

     The following two examples illustrate how this termination provision in the
merger agreement would work:

     Example One:  Assume that the average price per NBT share during the 20-day
trading period is $14.00, which is a decline of $2.75 from $16.75, or, expressed
as a percentage,  of 16.42%; and assume that the decline in the weighted average
price per share of the index group during the 20-day trading  period,  expressed
as a percentage,  is 4.25%.  We subtract  4.25% from 16.42% to arrive at 12.17%.
Under this example only the first of the two  conditions  is present and Pioneer
American would not have the right to cancel the merger agreement.

     Example Two:  Assume that the average price per NBT share during the 20-day
trading period is again $14.00; however, assume that the decline in the weighted
average price per share of the index group, expressed as a percentage, is 1.00%.
We  subtract  1.00%  from  16.42%  and  arrive at  15.42%.  The first and second
conditions of the termination provision are present and Pioneer American has the
right to cancel  the merger  agreement.  NBT can  require  Pioneer  American  to
complete the merger by increasing  the number of shares it will issue to Pioneer
American  stockholders.  Under  Example  Two,  NBT would  have to  increase  the
exchange  ratio  from  1.805 to 1.934 in order to require  Pioneer  American  to
complete the merger.  We compute the new  exchange  ratio of 1.934 by taking the
exchange  ratio of 1.805 and  adjusting  it to offset the decline from $15.00 in
the average price per NBT share during the 20-day trading period (1.805 x $15.00
/ $14.00 = 1.934).

     In the event Pioneer American  terminates the merger  agreement,  under the
provisions  referenced  above  relating  to a decline in the price of NBT common
stock,  stockholder action would not be required.  Neither the NBT Board nor the
Pioneer  American  Board has made a decision as to whether it would exercise its
rights  under the merger  agreement  under such  circumstances.  The  respective
boards of NBT and  Pioneer  American  would make such a decision in light of the
circumstances existing at the time that the respective board has the opportunity
to make such an election,  if any. Prior to making any determination to exercise
their  respective  rights under the merger  agreement,  the Boards would consult
their  respective  financial and other advisors and would consider all financial
and other information deemed relevant to their respective  decisions.  There can
be no assurance that the Boards would exercise their respective rights under the
merger  agreement  if the  conditions  set forth above were  applicable.  If the
Pioneer  American  Board does not elect to exercise its right to  terminate  the
merger agreement under the circumstances discussed in this section, the exchange
ratio would be 1.805 and the dollar value of the consideration

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<PAGE>


which the  stockholders  of Pioneer  American  would  receive  for each share of
Pioneer  American  common  stock would be the value  1.805  shares of NBT common
stock at the effective time of the merger.

     Termination and Damages for Breach of the Merger Agreement.  If termination
of  the  merger  agreement  is  the  result  of  material  incorrectness  of any
representation  or warranty  or the  material  breach or  material  failure of a
covenant,   the  party  whose  representations  or  warranties  were  materially
incorrect or which materially  breached the covenant will be liable to the other
party in the amount of $500,000.  If termination of the merger  agreement is the
result of a determination  by the Pioneer American Board that its fiduciary duty
to Pioneer American's  stockholders requires termination of the merger agreement
because of a proposal to acquire stock or assets of Pioneer  American or Pioneer
American  Bank,  or if  termination  of the  merger  agreement  is the result of
material  incorrectness of any representation or warranty of Pioneer American or
the material  breach or material  failure of a Pioneer  American  covenant,  and
Pioneer  American or Pioneer  American  Bank signs a definitive  agreement  with
respect to a proposal to acquire stock or assets of Pioneer  American or Pioneer
American Bank within one year after  termination of the merger  agreement,  then
Pioneer  American  will be liable to NBT for  liquidated  damages in the further
amount of $3 million.

AMENDMENT AND WAIVER

     Subject  to  compliance  with  applicable  law,  the  party  to the  merger
agreement  benefited by a particular  provision may, prior to the effective time
of the merger, waive that provision of the merger agreement.  The parties to the
merger  agreement  may amend or modify any provision at any time by an agreement
in writing between the parties.

SURVIVAL OF CERTAIN PROVISIONS

     If the Merger Agreement Becomes Effective.  After the effective time of the
merger,  various  provisions  of the merger  agreement  regarding  the following
matters will survive and remain effective:

     o    procedures  for the issuance of NBT common stock and NBT stock options
          in exchange for Pioneer American common stock and outstanding  Pioneer
          American stock options;

     o    indemnification of Pioneer American directors and officers;

     o    employment of Mr. Reuther; and

     o    appointment  or  election  of  three  Pioneer  American  directors  as
          directors of NBT.

     If the Merger Agreement Terminates before the Effective Time. If the merger
agreement terminates before the effective time, various provisions of the merger
agreement regarding the following matters will survive and remain effective:

     o    confidentiality of information  obtained in connection with the merger
          agreement;

     o    provisions  regarding  information  provided for  applications and the
          registration statement;

     o    liability  of  the  companies  to  each  other  as  a  result  of  the
          termination of the merger agreement; and

     o    expenses incurred in connection with the proposed merger.

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RESTRICTIONS ON RESALES BY AFFILIATES

     NBT has  registered  the shares of common  stock  issuable  to the  Pioneer
American  stockholders in the merger under the Securities Act.  Holders of these
securities  who are not  deemed  to be  "affiliates,"  as  defined  in the rules
promulgated under the Securities Act, of NBT or Pioneer American may trade their
shares freely without restriction.

     Any  subsequent  transfer  of shares by any person who is an  affiliate  of
Pioneer  American  at the time of  submission  of the  merger  agreement  to the
Pioneer  American  stockholders for their vote will, under existing law, require
either:

     o    the further registration under the Securities Act of the shares of NBT
          common stock to be transferred;

     o    compliance with Rule 145  promulgated  under the Securities Act, which
          permits limited sales under certain circumstances; or

     o    the availability of another exemption from registration of the shares.

     An affiliate of Pioneer  American is a person who  directly,  or indirectly
through one or more  intermediaries,  controls,  is  controlled  by, or is under
common control with Pioneer American.  We expect these  restrictions to apply to
the directors and executive  officers of Pioneer American and the holders of 10%
or more of the Pioneer  American common stock.  The same  restrictions  apply to
certain  relatives  or the  spouse of those  persons  and any  trusts,  estates,
corporations  or other  entities  in which those  persons  have a 10% or greater
beneficial or equity interest.  NBT will give stop transfer  instructions to the
transfer  agent with respect to those shares of NBT common stock held by persons
subject to these  restrictions,  and NBT will place a legend on the certificates
for their shares accordingly.

     SEC guidelines  regarding  qualifying for the "pooling of interests" method
of accounting limit sales of shares of NBT and Pioneer American by affiliates of
either company in a business combination.  SEC guidelines also indicate that the
pooling of interests  method of accounting  generally  will not be challenged on
the basis of sales by affiliates of NBT and Pioneer  American if such affiliates
do not dispose of any of the shares of the corporation  they own, or shares of a
corporation  they  receive  in  connection  with a  merger,  during  the  period
beginning  thirty days before  completion  of the merger and ending when NBT has
published  financial  results  covering  at  least  thirty  days of  post-merger
operations of NBT.

     Pioneer  American has agreed in the merger  agreement  to use  commercially
reasonable  efforts to cause each person who is an affiliate of Pioneer American
for purposes of Rule 145 under the Securities Act and for purposes of qualifying
the merger for pooling of  interests  accounting  treatment  to deliver to NBT a
written  agreement  intended to ensure compliance with the Securities Act and to
preserve NBT's ability to treat the merger as a pooling of interests.

FEES FOR FINANCIAL ADVISORY SERVICES

     NBT and Pioneer  American  have each  retained  the  services of  financial
advisors in connection  with  evaluation of the merger and the terms  associated
with the merger  consideration.  See "The  Issuance  of NBT Common  Stock in the
Merger and  Ratification  of the Merger  Agreement -- Opinion of NBT's Financial
Advisor" and "-- Opinion of Pioneer American's Financial Advisor."

ALLOCATION OF COSTS AND EXPENSES

     The merger agreement  provides that each party to the merger agreement will
be  responsible  for paying its own costs and  expenses,  including the fees and
expenses of its own counsel,  financial advisors,  accountants and tax advisors,
incurred in connection with the merger agreement.  However, the merger agreement
expressly allocates certain specified expenses as follows:

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     o    each party will pay its  proportionate  share of the cost of  printing
          the joint proxy  statement/prospectus  based upon the number of copies
          each shall request for printing;

     o    NBT   will   pay   the   cost   of   delivering    the   joint   proxy
          statement/prospectus and other material to the NBT stockholders;

     o    Pioneer  American  will pay the cost of  delivering  the  joint  proxy
          statement/prospectus  and  other  material  to  the  Pioneer  American
          stockholders;

     o    NBT will pay the cost of  registering  under  the  federal  and  state
          securities  laws the shares of NBT common stock that NBT will issue to
          the Pioneer American stockholders upon completion of the merger; and

     o    Pioneer  American  will pay the cost of  procuring  the  required  tax
          opinion.


                                  THE COMPANIES

NBT BANCORP INC.

     NBT Bancorp Inc. is a  registered  bank holding  company  headquartered  in
Norwich,  New York. NBT is the parent holding  company of NBT Bank,  N.A. and LA
Bank, National Association,  each a national bank. The principal asset of NBT is
all of the  outstanding  shares of common stock of NBT Bank and LA Bank, and its
principal source of revenue is dividends it receives from NBT Bank and LA Bank.

     NBT Bank is a full  service  commercial  bank  providing  a broad  range of
financial  products and services.  NBT Bank has thirty-six  locations  serving a
nine county area in central and northern New York. As of December 31, 1999,  NBT
Bank had 445  full-time and 76 part-time  employees.  NBT Bank is not a party to
any collective bargaining  agreements,  and employee relations are considered to
be good.

     On  February  17,  2000,  NBT  completed  its  acquisition  of Lake  Ariel.
Following  that merger,  LA Bank,  formerly a  wholly-owned  subsidiary  of Lake
Ariel,  became a  wholly-owned  subsidiary  of NBT. At the present  time LA Bank
continues to operate  under the LA Bank name. LA Bank was founded in 1910 and is
a national banking association and member of the Federal Reserve System. LA Bank
is a  full-service  commercial  bank providing a range of services and products,
including time and demand deposit  accounts,  consumer,  commercial and mortgage
loans,  and credit cards to individuals and small to medium-sized  businesses in
its northeastern  Pennsylvania  market area. LA Bank has 22 locations located in
Lackawanna, Luzerne, Monroe, Pike and Wayne Counties,  Pennsylvania. LA Bank has
two subsidiaries,  LA Lease,  Inc., a business unit that engages in consumer and
commercial  leasing;  and Ariel Financial  Services,  Inc., a business unit that
offers stocks,  bonds,  annuities and other  insurance-related  products.  As of
December 31, 1999, LA Bank had 146 full-time and 36 part-time employees. LA Bank
is not a party to any collective bargaining  agreements,  and employee relations
are considered to be good.

     On March 28,  2000,  NBT and M.  Griffith,  Inc.  announced  that they have
signed a definitive  agreement  which  provides that NBT will acquire all of the
stock of M. Griffith.  M. Griffith is a Utica,  New York,  based securities firm
offering  investment,   financial  advisory,   and  asset-management   services,
primarily in the Mohawk Valley region. The firm is a full-service  broker-dealer
and a registered investment advisor.  Founded in 1947, M. Griffith will become a
wholly-owned  subsidiary of NBT Financial  Services,  Inc., a subsidiary of NBT.
Consummation of the acquisition is scheduled for the second quarter of 2000.

     The banking  business is  extremely  competitive,  and NBT Bank  encounters
intense competition from other financial  institutions located within its market
area.  The banking  business in LA Bank's  5-county  market is  considered to be
extremely  competitive.  In addition, NBT Bank and LA Bank compete not only with
other  commercial  banks  but also with  other  financial  institutions  such as
thrifts,  credit  unions,  money market and mutual funds,  insurance  companies,
brokerage firms, and a variety of other companies offering  financial  services.
Some of these financial  services providers are located outside their respective
market areas.

     NBT's  principal  executive  offices are located at 52 South Broad  Street,
Norwich, New York 13815, and its telephone number is (607) 337-2265.

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PIONEER AMERICAN HOLDING COMPANY CORP.

     Pioneer  American is a  registered  bank holding  company and  Pennsylvania
business corporation and is headquartered in Carbondale,  Pennsylvania.  Pioneer
American has one wholly-owned subsidiary which is Pioneer American Bank.

     Pioneer  American  Bank  was  founded  in 1864  and is a  national  banking
association and member of the Federal Reserve System. Pioneer American Bank is a
full-service  commercial  bank  providing  a range  of  services  and  products,
including time and demand deposit  accounts,  consumer,  commercial and mortgage
loans to individuals  and small to medium-sized  businesses in its  northeastern
Pennsylvania  market area.  Pioneer  American  Bank has 18 locations  located in
Lackawanna, Luzerne, Monroe, Wayne and Wyoming Counties, Pennsylvania.

     As of December 31, 1999,  Pioneer  American  Bank had 159  full-time and 38
part-time  employees.  Pioneer  American  Bank is not a party to any  collective
bargaining agreements, and employee relations are considered to be good.

     The  banking  business in Pioneer  American  Bank's  five-county  market is
considered  to be extremely  competitive.  Pioneer  American  Bank competes with
respect to its lending  activities,  as well as in attracting  demand  deposits,
with local  commercial  banks,  other  commercial banks with branches in Pioneer
American  Bank's  market area,  savings  banks,  savings and loan  associations,
insurance companies,  finance companies, leasing companies, mutual funds, credit
unions and others. Pioneer American Bank is generally competitive with financial
institutions in its service area with respect to interest rates paid on time and
savings  deposits,  service  charges on deposit  accounts,  and  interest  rates
charged on loans.

     Pioneer American's principal executive offices are located at 41 North Main
Street, Carbondale, Pennsylvania. Its telephone number is (570) 282-2662.

Legal Proceedings

     Pioneer  American  received  a letter  dated  March 9, 1999,  from  counsel
retained by a former executive officer of Pioneer American, stating an intention
to take legal action against Pioneer American in connection with the purchase of
his shares by Pioneer  American  in August of 1999.  In the  letter,  the former
executive officer demands that payment be made to him in the approximate  amount
of $592,285.  Pioneer  American  believes  that this claim is without  merit and
intends to aggressively  defend any action if formal proceedings are instituted.
Because no formal  action has been  instituted,  Pioneer  American  is unable to
ascertain whether an unfavorable outcome is either probable or remote, or in the
event of an unfavorable outcome, the amount of the loss, if any.

NBT FOLLOWING THE MERGER

     Following  the  merger,  NBT will  have a Board of  Directors  composed  of
fifteen  individuals.  NBT's bylaws provide for a classified board of directors.
The board is divided  into three equal  classes.  Each class holds  office for a
staggered  term of three years,  but only one class comes up for  election  each
year.  The merger  agreement  provides  that  Messrs.  Nasser,  Goldenziel,  and
Chojnowski,  currently  directors of Pioneer American,  will become directors of
NBT  following  the merger,  with Mr. Nasser to serve as a director of the class
whose term expires in 2003,  Mr.  Goldenziel to serve as a director of the class
whose term  expires in 2001,  and Mr.  Chojnowski  to serve as a director of the
class whose term expires in 2002.  After  completion of the merger,  NBT expects
that its board of directors  will consist of the three former  Pioneer  American
directors and the twelve  current  members of the NBT Board,  three of whom will
have been former directors of Lake Ariel.


                           REGULATION AND SUPERVISION

     The following discussion sets forth the material elements of the regulatory
framework  applicable to bank holding  companies and national banks and provides
certain  specific  information  relevant  to  NBT  and  Pioneer  American.  This
regulatory  framework primarily is intended for the protection of depositors and
the  deposit  insurance  funds  that  insure  bank  deposits,  and  not  for the
protection of security  holders.  To the extent that the  following  information
describes statutory and regulatory  provisions,  it is qualified in its entirety
by reference to those  provisions.  A change in the  statutes,  regulations,  or
regulatory  policies  applicable to NBT and Pioneer  American or to NBT Bank, LA
Bank and Pioneer American Bank may have a material effect on the business of NBT
or Pioneer American.

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<PAGE>


     Various  governmental  requirements,  including Sections 23A and 23B of the
Federal  Reserve Act,  limit  borrowings  by NBT from NBT Bank or LA Bank and by
Pioneer  American  from  Pioneer  American  Bank and also  limit  various  other
transactions  between NBT and NBT Bank or LA Bank and between  Pioneer  American
and Pioneer  American Bank. For example,  Section 23A of the Federal Reserve Act
limits to no more than 10 percent of its total capital the aggregate outstanding
amount of any insured  bank's loans and other  "covered  transactions"  with any
particular non-bank affiliate and limits to no more than 20 percent of its total
capital  the  aggregate   outstanding  amount  of  any  insured  bank's  covered
transactions  with  all  of its  non-bank  affiliates.  At  December  31,  1999,
approximately  $17,332,000  were  available  for  loans to NBT from NBT Bank and
approximately  $2,001,000  was  available  for loans to  Pioneer  American  from
Pioneer  American  Bank.  Section 23A of the Federal  Reserve Act also generally
requires that an insured bank's loans to its non-bank affiliates be secured, and
Section 23B of the Federal Reserve Act generally requires that an insured bank's
transactions with its non-bank  affiliates be on arm's-length  terms.  Also, NBT
and Pioneer  American and their  subsidiaries  are  prohibited  from engaging in
certain  "tie-in"  arrangements  in  connection  with  extensions  of  credit or
provision of property or services.

     As national banks,  NBT Bank, LA Bank and Pioneer American Bank are subject
to primary  supervision,  regulation,  and  examination by the OCC and secondary
regulation  by the FDIC and the Federal  Reserve  Board.  NBT Bank,  LA Bank and
Pioneer American Bank are subject to extensive  federal statutes and regulations
that significantly  affect their business and activities.  NBT Bank, LA Bank and
Pioneer American Bank must file reports with their  regulators  concerning their
activities and financial  condition and obtain regulatory approval to enter into
certain  transactions.  NBT Bank,  LA Bank and  Pioneer  American  Bank are also
subject to periodic examinations by the OCC to ascertain compliance with various
regulatory  requirements.  Other applicable  statutes and regulations  relate to
insurance of deposits,  allowable  investments,  loans,  acceptance of deposits,
trust  activities,  mergers,  consolidations,   payment  of  dividends,  capital
requirements,  reserves against deposits,  establishment of branches and certain
other  facilities,  limitations on loans to one borrower and loans to affiliated
persons,  and other aspects of the business of banks. Recent federal legislation
has  instructed  federal  agencies to adopt  standards or  guidelines  governing
banks'  internal  controls,  information  systems,  loan  documentation,  credit
underwriting,  interest rate exposure, asset growth,  compensation and benefits,
asset quality,  earnings and stock  valuation,  and other  matters.  Legislation
adopted  in 1994 gives the  federal  banking  agencies  greater  flexibility  in
implementing  standards  on  asset  quality,   earnings,  and  stock  valuation.
Regulatory  authorities have broad flexibility to initiate  proceedings designed
to prohibit banks from engaging in unsafe and unsound banking practices.

     NBT, Pioneer American, and their respective  subsidiaries are also affected
by various other  governmental  requirements and  regulations,  general economic
conditions,  and the fiscal and monetary policies of the federal  government and
the Federal  Reserve Board.  The monetary  policies of the Federal Reserve Board
influence  to a  significant  extent the overall  growth of loans,  investments,
deposits,  interest rates charged on loans,  and interest rates paid on deposit.
The nature  and impact of future  changes  in  monetary  policies  are often not
predictable.

SUPPORT OF SUBSIDIARY BANKS

     Under  current  Federal  Reserve Board  policy,  a bank holding  company is
expected to act as a source of financial and managerial  strength to each of its
subsidiary  banks  by  standing  ready to use  available  resources  to  provide
adequate  capital  funds to its  subsidiary  banks  during  periods of financial
adversity and by  maintaining  the  financial  flexibility  and  capital-raising
capacity to obtain additional  resources for assisting its subsidiary banks. The
support  expected by the Federal Reserve Board may be required at times when the
bank holding company may not have the resources or inclination to provide it.

     Section 55 of the  National  Bank Act permits the OCC to order the pro-rata
assessment of stockholders of a national bank whose capital has become impaired.
NBT and Pioneer  American  are the sole  stockholders  of NBT Bank,  LA Bank and
Pioneer American Bank. If a stockholder fails,  within three months, to pay that
assessment,  the OCC can order the sale of the stockholder's  stock to cover the
deficiency. In the event of a bank holding company's bankruptcy,  any commitment
by the bank holding company to a federal bank regulatory  agency to maintain the
capital of a  subsidiary  bank would be assumed by the  bankruptcy  trustee  and
entitled to priority of payment.

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     If a default occurred with respect to a bank, any capital loans to the bank
from its parent  holding  company  would be  subordinate  in right of payment to
payment of the bank's depositors and certain of its other obligations.

LIABILITY OF COMMONLY CONTROLLED BANKS

     Any depository  institution  insured by the FDIC can be held liable for any
loss incurred,  or reasonably expected to be incurred, by the FDIC in connection
with:

     o    the  default  of  a  commonly   controlled   FDIC-insured   depository
          institution or

     o    any  assistance   provided  by  the  FDIC  to  a  commonly  controlled
          FDIC-insured depository institution in danger of default.

     "Default"  generally  is defined as the  appointment  of a  conservator  or
receiver,  and "in danger of default"  generally is defined as the  existence of
certain  conditions  indicating that a default is likely to occur in the absence
of regulatory assistance.

DEPOSITOR PREFERENCE STATUTE

     In the "liquidation or other resolution" of an institution by any receiver,
federal legislation provides that deposits and certain claims for administrative
expenses  and  employee  compensation  against  an insured  bank are  afforded a
priority  over other  general  unsecured  claims  against  that bank,  including
federal funds and letters of credit.

CAPITAL REQUIREMENTS

     NBT and Pioneer American are subject to risk-based capital requirements and
guidelines imposed by the Federal Reserve Board, which are substantially similar
to the capital requirements and guidelines imposed by the OCC on national banks.
For  this  purpose,  a bank's  or bank  holding  company's  assets  and  certain
specified  off-balance  sheet  commitments are assigned to four risk categories,
each weighted  differently based on the level of credit risk that is ascribed to
those assets or commitments. In addition,  risk-weighted assets are adjusted for
low-level  recourse and market-risk  equivalent assets. A bank's or bank holding
company's capital, in turn, includes the following tiers:

     o    core ("Tier 1") capital, which includes common equity,  non-cumulative
          perpetual  preferred  stock, a limited amount of cumulative  perpetual
          preferred  stock,  and  minority   interests  in  equity  accounts  of
          consolidated   subsidiaries,   less  goodwill,   certain  identifiable
          intangible assets, and certain other assets; and

     o    supplementary ("Tier 2") capital,  which includes,  among other items,
          perpetual preferred stock not meeting the Tier 1 definition, mandatory
          convertible securities,  subordinated debt and allowances for loan and
          lease losses,  subject to certain  limitations,  less certain required
          deductions.

     NBT and Pioneer American,  like other bank holding companies,  are required
to maintain  Tier 1 and "Total  Capital"  (the sum of Tier 1 and Tier 2 capital,
less  certain  deductions)  equal to at least 4 percent  and 8 percent  of their
total risk-weighted assets (including certain  off-balance-sheet  items, such as
unused lending  commitments  and standby  letters of credit),  respectively.  At
December 31, 1999,  NBT and Pioneer  American each met both  requirements,  with
Tier 1 and total  capital  equal to 13.63 percent and 14.78 percent (in the case
of NBT) and 14.56 percent and 15.81 percent (in the case of Pioneer American) of
total risk-weighted  assets. On an NBT-and-Pioneer  American basis, these ratios
at December 31, 1999 would have been 13.78  percent for Tier 1 capital and 14.95
percent for total capital.

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     The Federal  Reserve  Board and the OCC have adopted  rules to  incorporate
market  and  interest  rate  risk  components  into  their  risk-based   capital
standards.  Amendments to the  risk-based  capital  requirements,  incorporating
market  risk,  became  effective  January  1,  1998.  Under the new  market-risk
requirements,  capital  will be  allocated  to support the amount of market risk
related to a financial institution's ongoing trading activities.

     The Federal Reserve Board also requires bank holding  companies to maintain
a minimum  "Leverage  Ratio"  (Tier 1 capital  to  adjusted  total  assets) of 3
percent if the bank holding company has the highest  regulatory rating and meets
certain other  requirements,  or of 3 percent plus an  additional  cushion of at
least 1 to 2 percentage  points if the bank holding  company does not meet these
requirements.  At December 31, 1999,  NBT's  leverage ratio was 8.74 percent and
Pioneer  American's  leverage  ratio  was 8.11  percent.  On an  NBT-and-Pioneer
American  basis,  the  leverage  ratio at December 31, 1999 would have been 8.63
percent.

     The  Federal  Reserve  Board may set capital  requirements  higher than the
minimums noted above for holding companies whose  circumstances  warrant it. For
example, bank holding companies experiencing or anticipating  significant growth
may be expected to maintain  strong capital  positions  substantially  above the
minimum  supervisory levels without  significant  reliance on intangible assets.
Furthermore,  the Federal  Reserve Board has  indicated  that it will consider a
"Tangible Tier 1 Leverage Ratio"  (deducting all  intangibles) and other indicia
of capital  strength in evaluating  proposals for expansion or new activities or
when a bank holding company faces unusual or abnormal risks. The Federal Reserve
Board has not advised NBT or Pioneer  American of any specific  minimum leverage
ratio applicable to it.

     NBT  Bank,  LA Bank and  Pioneer  American  Bank  are  subject  to  similar
risk-based  capital and leverage  requirements  adopted by the OCC. NBT Bank, LA
Bank and Pioneer  American Bank were in compliance  with the applicable  minimum
capital  requirements as of December 31, 1999. The OCC has not advised NBT Bank,
LA  Bank or  Pioneer  American  Bank  of any  specific  minimum  leverage  ratio
applicable to it.

     Failure to meet capital  requirements  could subject a bank to a variety of
enforcement  remedies,  including the  termination  of deposit  insurance by the
FDIC, and to certain restrictions on its business. The Federal Deposit Insurance
Corporation Improvements Act of 1991 ("FDICIA"),  among other things, identifies
five  capital  categories  for  insured  banks -- well  capitalized,  adequately
capitalized,  undercapitalized,  significantly undercapitalized,  and critically
undercapitalized  -- and requires federal bank regulatory  agencies to implement
systems  for  "prompt  corrective  action"  for  insured  banks that do not meet
minimum  capital  requirements  based on these  categories.  The FDICIA  imposes
progressively  more  restrictive  constraints  on  operations,  management,  and
capital  distributions,  depending  on the category in which an  institution  is
classified.  Unless a bank is well capitalized, it is subject to restrictions on
its ability to offer brokered deposits, on "pass-through" insurance coverage for
certain of its accounts, and on certain other aspects of its operations.  FDICIA
generally  prohibits  a bank from  paying any  dividend  or making  any  capital
distribution  or paying any  management  fee to its holding  company if the bank
would thereafter be  undercapitalized.  An  undercapitalized  bank is subject to
regulatory  monitoring  and may be  required  to divest  itself of or  liquidate
subsidiaries.  Holding  companies of such institutions may be required to divest
themselves  of such  institutions  or divest  themselves  of or liquidate  other
affiliates.  An  undercapitalized  bank must develop a capital restoration plan,
and its parent bank holding  company must guarantee the bank's  compliance  with
the plan up to the  lesser  of 5  percent  of the  bank's  assets at the time it
became undercapitalized or the amount needed to comply with the plan. Critically
undercapitalized  institutions  are prohibited from making payments of principal
and interest on  subordinated  debt and are  generally  subject to the mandatory
appointment of a conservator or receiver.

     Rules  adopted by the OCC under  FDICIA  provide  that a  national  bank is
deemed to be well capitalized if the bank has a total  risk-based  capital ratio
of 10 percent or  greater,  a Tier 1  risk-based  capital  ratio of 6 percent or
greater, and a leverage ratio of 5 percent or greater and the institution is not
subject to a written agreement,  order, capital directive,  or prompt corrective
action  directive to meet and maintain a specific level of any capital  measure.
As of  December  31,  1999,  NBT Bank,  LA Bank and Pioneer  American  Bank were
well-capitalized,  based on the prompt  corrective  action ratios and guidelines
described  above.  It should be noted,  however,  that a national bank's capital
category  is  determined  solely for the purpose of  applying  the OCC's  prompt
corrective action regulations, and

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<PAGE>


that the capital category may not constitute an accurate  representation  of the
bank's overall financial condition or prospects.

BROKERED DEPOSITS

     Under FDIC  regulations,  no FDIC-insured bank can accept brokered deposits
unless it

     o    is well capitalized, or

     o    is adequately capitalized and receives a waiver from the FDIC.

In addition,  these  regulations  prohibit any bank that is not well capitalized
from paying an interest rate on brokered deposits in excess of three-quarters of
one percentage point over certain prevailing market rates.

DIVIDEND RESTRICTIONS

     NBT is a legal  entity  separate  and  distinct  from NBT Bank.  Similarly,
Pioneer  American is a legal entity separate and distinct from Pioneer  American
Bank. In general, under the law of their state of incorporation, NBT and Pioneer
American cannot pay a cash dividend if such payment would render them insolvent.
The revenues of NBT and Pioneer American consist  primarily of dividends paid by
NBT Bank and  Pioneer  American  Bank  respectively.  Various  federal and state
statutory provisions limit the amount of dividends NBT Bank and Pioneer American
Bank can pay to NBT and Pioneer American without regulatory  approval.  Dividend
payments by national banks are limited to the lesser of:

     o    the level of undivided profits, and

     o    absent regulatory approval,  an amount not in excess of net income for
          the current year  combined  with retained net income for the preceding
          two years.

     At December 31, 1999,  approximately  $27.2 million and $4.2 million of the
total stockholders'  equity of NBT Bank and Pioneer American Bank were available
for payment of  dividends  to NBT and Pioneer  American,  respectively,  without
approval by the OCC.

     In addition, federal bank regulatory authorities have authority to prohibit
NBT Bank and  Pioneer  American  Bank from  engaging  in an  unsafe  or  unsound
practice in conducting their business. Depending upon the financial condition of
the bank in question,  the payment of dividends could be deemed to constitute an
unsafe or unsound practice. The ability of NBT Bank and Pioneer American Bank to
pay  dividends  in the  future is  currently  influenced,  and could be  further
influenced, by bank regulatory policies and capital guidelines.

DEPOSIT INSURANCE ASSESSMENTS

     The deposits of NBT Bank, LA Bank and Pioneer  American Bank are insured up
to  regulatory  limits by the FDIC and,  accordingly,  are  subject  to  deposit
insurance   assessments   to  maintain  the  Bank  Insurance  Fund  (the  "BIF")
administered  by the  FDIC.  The FDIC has  adopted  regulations  establishing  a
permanent  risk-related  deposit insurance assessment system. Under this system,
the FDIC places each  insured bank in one of nine risk  categories  based on the
bank's  capitalization and supervisory  evaluations  provided to the FDIC by the
institution's   primary  federal   regulator.   Each  insured  bank's  insurance
assessment  rate  is  then  determined  by the  risk  category  in  which  it is
classified by the FDIC.

     In the light of the recent  favorable  financial  situation  of the federal
deposit  insurance  funds and the recent low  number of  depository  institution
failures,  effective  January  1, 1997 the  annual  insurance  premiums  on bank
deposits  insured by the BIF vary  between  $0.00 per $100 of deposits for banks
classified in the highest capital and

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supervisory  evaluation  categories  to $0.27  per $100 of  deposits  for  banks
classified in the lowest  capital and  supervisory  evaluation  categories.  BIF
assessment  rates are  subject to  semi-annual  adjustment  by the FDIC within a
range of up to five basis points without public comment. The FDIC also possesses
authority to impose special assessments from time to time.

     The Deposit  Insurance  Funds Act provides for assessments to be imposed on
insured depository  institutions with respect to deposits insured by the BIF (in
addition  to  assessments  currently  imposed on  depository  institutions  with
respect to  BIF-insured  deposits) to pay for the cost of Financing  Corporation
("FICO")  funding.  The FDIC established the FICO assessment rates effective for
the  fourth  quarter  1999  at  approximately   $0.012  per  $100  annually  for
BIF-assessable  deposits. The FICO assessments are adjusted quarterly to reflect
changes  in the  assessment  bases of the FDIC  insurance  funds and do not vary
depending  upon  a  depository   institution's   capitalization  or  supervisory
evaluations.  In 1999, NBT Bank and Pioneer  American Bank paid FICO assessments
of $165,897 and $35,328, respectively.

INTERSTATE BANKING AND BRANCHING

     Under the  Riegle-Neal  Interstate  Banking and  Branching  Efficiency  Act
("Riegle-Neal"), subject to certain concentration limits and other requirements:

     o    bank holding  companies such as NBT and Pioneer American are permitted
          to acquire banks and bank holding companies located in any state;

     o    any bank that is a subsidiary  of a bank holding  company is permitted
          to receive deposits,  renew time deposits, close loans, service loans,
          and  receive  loan  payments  as an  agent  for any  other  depository
          institution subsidiary of that bank holding company; and

     o    banks are  permitted  to acquire  branch  offices  outside  their home
          states by merging with out-of-  state  banks,  purchasing  branches in
          other states, and establishing de novo branch offices in other states.

The ability of banks to acquire  branch offices  through  purchase or opening of
other  branches  is  contingent,  however,  on the  host  state  having  adopted
legislation  "opting in" to those  provisions of Riegle-Neal.  In addition,  the
ability of a bank to merge with a bank located in another state is contingent on
the host state not having adopted  legislation "opting out" of that provision of
Riegle-Neal.

CONTROL ACQUISITIONS

     The Change in Bank Control Act  prohibits a person or group of persons from
acquiring "control" of a bank holding company,  unless the Federal Reserve Board
has been  notified and has not objected to the  transaction.  Under a rebuttable
presumption  established  by the Federal  Reserve Board,  the  acquisition of 10
percent  or more of a class of voting  stock of a bank  holding  company  with a
class of securities registered under Section 12 of the Exchange Act, such as NBT
or  Pioneer  American,   would,   under  the  circumstances  set  forth  in  the
presumption, constitute acquisition of control of the bank holding company.

     In  addition,  a company is required to obtain the  approval of the Federal
Reserve  Board under the BHC Act before  acquiring  25 percent (5 percent in the
case of an  acquiror  that is a bank  holding  company)  or more of any class of
outstanding  common  stock of a bank  holding  company,  such as NBT or  Pioneer
American, or otherwise obtaining control or a "controlling  influence" over that
bank holding company.

                                       95

<PAGE>


FINANCIAL MODERNIZATION

     On November 12, 1999, the President signed into law the  Gramm-Leach-Bliley
Act (the "Act") which will,  effective  March 11, 2000,  permit  qualifying bank
holding  companies to become financial  holding  companies and thereby affiliate
with  securities  firms and insurance  companies and engage in other  activities
that are  financial in nature or  complementary  thereto,  as  determined by the
Federal  Reserve Board.  A bank holding  company may elect to become a financial
holding company if each of its subsidiary  banks (a) is well  capitalized  under
the prompt corrective action provisions of FDICIA, (b) is well managed,  and (c)
has at least a satisfactory rating under the Community Reinvestment Act. The Act
identifies several activities as "financial in nature," including, among others,
insurance   underwriting  and  agency,   investment   advisory   services,   and
underwriting,  dealing  in or  making a market  in  securities.  Under  the Act,
subject to limitations on investment,  a national bank may,  through a financial
subsidiary of the bank,  engage in activities  that are financial in nature,  or
incidental thereto,  excluding, among others, insurance underwriting,  insurance
company portfolio investment, real estate development and real estate investment
if the bank is well  capitalized,  well managed and has at least a  satisfactory
CRA rating.  Subsidiary  banks of a financial  holding company or national banks
with  financial  subsidiaries  must  continue  to be well  capitalized  and well
managed in order to  continue  to engage in  activities  that are  financial  in
nature  without  regulatory   actions  or  restrictions,   which  could  include
divestiture of a non-banking subsidiary or subsidiaries.  A bank holding company
which does not elect to become a  financial  holding  company  may  continue  to
engage in activities  approved for bank holding companies by the Federal Reserve
Board prior to enactment of the Act.

     The Act does not  significantly  alter the  regulatory  regimes under which
NBT,  Pioneer  American,  NBT Bank, LA Bank or Pioneer  American Bank  currently
operate, as we describe above. While certain business combinations not currently
permissible  will be possible  after March 11, 2000,  we cannot  predict at this
time resulting changes in the competitive environment or the financial condition
of NBT, Pioneer American,  NBT Bank, LA Bank or Pioneer American Bank. Using the
financial holding company  structure,  insurance  companies and securities firms
may  acquire  bank  holding  companies,  such as NBT,  Pioneer  American  or the
combined  company,  and may compete  more  directly  with banks or bank  holding
companies.  Neither  NBT nor  Pioneer  American  have,  at this  time,  made any
decisions  with respect to whether  they or the  combined  company will elect to
become a financial holding company under the Act.

FUTURE LEGISLATION

     Various  legislation,  including  proposals  to  substantially  change  the
financial institution  regulatory system and to expand or contract the powers of
banking institutions and bank holding companies, is from time to time introduced
in the Congress.  This legislation may change banking statutes and the operating
environment of the combined  company and its  subsidiaries  in  substantial  and
unpredictable ways. If enacted,  such legislation could increase or decrease the
cost of doing  business,  limit or expand  permissible  activities or affect the
competitive balance among banks, savings associations,  credit unions, and other
financial institutions.  Neither NBT nor Pioneer American can accurately predict
whether any of this potential  legislation  will ultimately be enacted,  and, if
enacted,  the ultimate effect that it, or implementing  regulations,  would have
upon the financial condition or results of operations of the combined company or
any of its subsidiaries.


                    MATERIAL FEDERAL INCOME TAX CONSEQUENCES

     We requested  Duane,  Morris & Heckscher LLP, counsel to NBT, to deliver an
opinion as to the anticipated  material  federal income tax  consequences of the
merger. In rendering its opinion,  Duane, Morris & Heckscher LLP assumed,  among
other  things,  that the  merger  and  related  transactions  will take place as
described in the merger  agreement.  Consummation  of the merger is  conditioned
upon the receipt of an opinion that the merger will qualify as a  reorganization
under ss. 368(a)(1) of the Internal Revenue Code of 1986, as amended.

     The discussion  below and the opinion of Duane,  Morris & Heckscher LLP are
based upon the  Internal  Revenue  Code,  Treasury  Regulations  thereunder  and
administrative  rulings  and  court  decisions  as of the  date  of  this  proxy
statement-prospectus.  The opinion of Duane,  Morris & Heckscher LLP is based on
the facts, representations

                                       96

<PAGE>


and   assumptions   set  forth  or  referred  to  in  the   opinion,   including
representations  contained  in  certificates  executed  by  officers  of NBT and
Pioneer American. The opinion is attached as Exhibit 8. No rulings have been, or
will be,  requested from the Internal  Revenue  Service as to the federal income
tax  consequences  of the  merger.  In  addition,  the opinion of counsel is not
binding on the Internal Revenue Service,  and there can be no assurance that the
Internal  Revenue  Service  will not  take a  position  contrary  to one or more
positions  reflected  in the  opinions or that the  positions  reflected  in the
opinion  will be upheld by the  courts if  challenged  by the  Internal  Revenue
Service.   Future   legislative,   judicial   or   administrative   changes   or
interpretations  could alter or modify the statements and  conclusions set forth
below,  and any such changes or  interpretations  could be retroactive and could
affect the tax consequences to stockholders of Pioneer American.

     The following would be the material  federal income tax consequences of the
merger:

     (1)  the merger will qualify as a "reorganization"  under Section 368(a)(1)
          of the Internal Revenue Code of 1986, as amended;

     (2)  no gain or loss will be recognized  by Pioneer  American or NBT in the
          merger;

     (3)  no gain or loss will be  recognized  by the  stockholders  of  Pioneer
          American  upon their receipt of NBT common stock in exchange for their
          Pioneer American common stock,  except that the cash proceeds received
          for fractional interests in NBT common stock will be treated as having
          been  received as a  distribution  in full payment in exchange for the
          fractional share interests redeemed. A stockholder of Pioneer American
          who receives  cash  instead of a fractional  share of NBT common stock
          will recognize  gain or loss equal to the difference  between the cash
          received and the  stockholder's  basis in that fractional  share,  and
          that gain or loss will be capital gain or loss if the fractional share
          would have been a capital asset in the hands of the stockholder;

     (4)  the tax basis of the shares of NBT common stock (including  fractional
          interests)  received by the Pioneer American  stockholders will be the
          same as the tax basis of their Pioneer American common stock exchanged
          for the NBT stock; and

     (5)  the  holding  period  of the NBT  common  stock in the hands of former
          Pioneer American stockholders will include the holding period of their
          Pioneer  American common stock  exchanged for the NBT stock,  provided
          the Pioneer  American  common stock is held as a capital  asset at the
          effective date of the merger.

     The  discussion  and the opinion of Duane,  Morris &  Heckscher  LLP do not
purport to deal with all tax aspects of federal income  taxation that may affect
particular  stockholders  of  Pioneer  American  in light  of  their  individual
circumstances,  and are not  intended for holders  subject to special  treatment
under the tax law  (including  dealers in  securities,  financial  institutions,
insurance  companies,  tax-exempt  organizations,   non-United  States  persons,
holders who hold their stock as part of a hedging  transaction,  an  appreciated
financial position, straddle or conversion transaction,  holders who do not hold
their stock as capital  assets and holders who acquired  their stock pursuant to
the  exercise  of  options or  otherwise  as  compensation).  In  addition,  the
discussion and the opinion do not consider the effect of any  applicable  state,
local or foreign tax laws.

     EACH  STOCKHOLDER  OF PIONEER  AMERICAN  IS URGED TO CONSULT HIS OR HER TAX
ADVISOR AS TO THE PARTICULAR TAX  CONSEQUENCES TO THE STOCKHOLDER OF THE MERGER,
INCLUDING THE APPLICABILITY AND EFFECT OF ANY STATE,  LOCAL OR FOREIGN TAX LAWS,
AND OF CHANGES IN APPLICABLE TAX LAWS.

                                       97

<PAGE>


                    PRICE RANGE OF COMMON STOCK AND DIVIDENDS

     NBT common  stock  trades on the Nasdaq  National  Market  under the symbol
"NBTB."  Following  the merger,  the shares of NBT common stock will continue to
trade on the Nasdaq National Market under that symbol.  Pioneer  American common
stock  trades  on  the  over-the-counter  market  under  the  symbol  "PAHC.OB."
Following the merger,  NBT will  deregister  the Pioneer  American  common stock
under the  Exchange  Act, and the common  stock of Pioneer  American  will cease
trading in the over-the-counter market.

     The  following  table has been  restated  to reflect  the payment by NBT on
December  15,  1999 of a 5%  stock  dividend  and  sets  forth  for the  periods
indicated (1) the range of high and low sales prices of the NBT common stock and
the Pioneer American common stock, and (2) the amount of cash dividends declared
per share by each company:

<TABLE>
<CAPTION>
                                                                NBT                               PIONEER AMERICAN
                                                                ---                               ----------------
                                                    SALES PRICES                              SALE PRICE
                                                    ------------                              ----------
                                                 HIGH          LOW        DIVIDENDS        HIGH          LOW       DIVIDENDS
                                                 ----          ---        ---------        ----          ---       ---------
<S>                                             <C>          <C>            <C>           <C>          <C>            <C>
1998
           First Quarter                        $19.05       $15.99         $ 0.117       $23.50       $21.38         $0.190
           Second Quarter                        23.48        18.37           0.154        25.25        22.50          0.190
           Third Quarter                         23.81        17.58           0.154        24.50        22.00          0.190
           Fourth Quarter                        24.29        19.72           0.162        23.50        22.00          0.200

1999
           First Quarter                        $23.33       $19.89         $ 0.162       $22.50       $19.00        $ 0.200
           Second Quarter                        21.19        19.05           0.162        28.00        19.13          0.200
           Third Quarter                         20.90        16.43           0.162        26.00        20.75          0.200
           Fourth Quarter                        17.98        14.63           0.170        30.00        23.50          0.200

2000
           First Quarter (through
           March 27, 2000)                      $16.50       $11.38         $ 0.170       $27.25       $19.75        $ 0.200
</TABLE>

     The timing and amount of future  dividends will depend upon earnings,  cash
requirements, the financial condition of NBT and its subsidiaries (and, prior to
completion  of the merger,  of Pioneer  American and its  subsidiary  insofar as
Pioneer American dividends are concerned),  applicable  government  regulations,
and other factors deemed relevant by the NBT Board (and by the Pioneer  American
Board prior to completion of the merger).  As described  under  "Regulation  and
Supervision -- Dividend  Restrictions," various federal and state laws limit the
ability of affiliated  banks to pay dividends to NBT and Pioneer  American.  The
merger agreement restricts the cash dividends payable on Pioneer American common
stock pending completion of the merger. See "The Issuance of NBT Common Stock in
the  Merger and  Ratification  of the Merger  Agreement  -- Conduct of  Business
Pending Completion the Merger."

     On  December  7,  1999,  the last  full  trading  day  prior to the  public
announcement of the proposed merger, the highest sales price of NBT common stock
was $16.75 per share,  the lowest sales price of NBT common stock was $16.25 per
share and the last  reported  sales  price of NBT  common  stock was  $16.25 per
share. On March 27, 2000, the most recent practicable date prior to the printing
of this joint proxy  statement/prospectus,  the last reported sales price of NBT
common stock was $14.25 per share. The preceding stock quotations  reflect NBT's
payment on December 15, 1999 of a 5% stock  dividend.  We urge  stockholders  to
obtain current market  quotations  prior to making any decisions with respect to
the merger.

     On  December  7,  1999,  the last  full  trading  day  prior to the  public
announcement of the proposed merger, the highest sales price of Pioneer American
common stock was $27.75 per share,  the lowest  sales price of Pioneer  American
common stock was $27.75 per share and the last  reported  sales price of Pioneer
American  common stock was $27.75 per share.  On March 27, 2000, the most recent
practicable date prior to the printing of this joint proxy

                                       98

<PAGE>


statement/prospectus,  the last reported sales price of Pioneer  American common
stock was  $22.25 per  share.  We urge  stockholders  to obtain  current  market
quotations prior to making any decisions with respect to the merger.

     As of February 29, 2000,  there were 5,195  holders of record of NBT common
stock and 1,445 holders of record of Pioneer American common stock.


                        DESCRIPTION OF NBT CAPITAL STOCK

AUTHORIZED CAPITAL STOCK

     NBT's 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, none of which are outstanding.  The NBT 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
February 29, 2000, 18,100,868 shares of NBT common stock were outstanding.

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 NBT common  stock are
entitled  to  receive  dividends  on  shares  of  common  stock  if, as and when
authorized  and  declared by the NBT Board out of funds  legally  available  for
dividends  and to share  ratably  in the  assets of NBT  legally  available  for
distribution to its stockholders in the event of its liquidation, dissolution or
winding-up  after  payment of, or adequate  provision  for,  all known debts and
liabilities of NBT.

     Each outstanding  share of NBT 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,  the NBT  certificate  of
incorporation  or the NBT  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 NBT common
stock possess the exclusive voting power.  There is no cumulative  voting in the
election of directors.  The NBT Board is classified  into three  categories with
each category  equal in number.  This means,  in general,  that one-third of the
members of the NBT Board are subject to  reelection  at each  annual  meeting of
stockholders.

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

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

     For a description of the provisions of the NBT Certificate of Incorporation
that may have the  effect  of  delaying,  deferring  or  preventing  a change in
control of NBT, see "Comparison of  Stockholders'  Rights --  Restrictions  upon
Certain Business Combinations."

PREFERRED STOCK

     The NBT Board is authorized,  without any further vote or action by the NBT
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,
powers,  preferences  and  rights of each such  series  and the  qualifications,
limitations or restrictions of the series, in

                                       99

<PAGE>


each case, if any, as are  permitted by Delaware law.  Because the NBT 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 NBT common  stock.  The issuance of shares of
preferred  stock could have the effect of delaying,  deferring  or  preventing a
change in control of NBT.

STOCKHOLDER RIGHTS PLAN

     In November 1994, NBT adopted a stockholder  rights plan designed to ensure
that any potential  acquiror of NBT would  negotiate with the NBT Board and that
all NBT  stockholders  would be  treated  equitably  in the event of a  takeover
attempt. At that time, NBT paid a dividend of one Preferred Share Purchase Right
for each outstanding  share of NBT common stock.  Similar rights are attached to
each share of NBT common  stock issued after  November 15, 1994,  including  the
shares of common stock issuable in the merger. The rights will continue to trade
with  the  shares  of NBT  common  stock  following  adoption  of the par  value
amendment.  Under the rights plan,  the rights will not be  exercisable  until a
person or group acquires  beneficial  ownership of 20 percent or more of the NBT
outstanding  common stock,  begins a tender or exchange  offer for 25 percent or
more of the NBT common  stock,  or an adverse  person,  as  declared  by the NBT
Board, acquires 10 percent or more of the NBT common stock. Additionally,  until
the  occurrence  of such an event,  the  rights are not  severable  from the NBT
common stock and therefore, the rights will transfer upon the transfer of shares
of the NBT common stock. Upon the occurrence of such events, each right entitles
the holder to purchase  one  one-hundredth  of a share of NBT 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 NBT 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 NBT's  option  prior  to the time  they  become
exercisable,   for  a  price  of  $0.01  per  right.  The  rights  have  certain
anti-takeover  effects. The rights may cause substantial dilution to a person or
group that  attempts to acquire NBT on terms not approved by the NBT Board.  The
rights  should  not  interfere  with any  merger or other  business  combination
approved by the NBT Board.

REGISTRAR AND TRANSFER AGENT

     NBT's  registrar and transfer  agent is American  Stock  Transfer and Trust
Company, New York, New York.


                       COMPARISON OF STOCKHOLDERS' RIGHTS

     Upon completion of the merger,  the  stockholders of Pioneer  American will
become  stockholders  of NBT. The rights of Pioneer  American  stockholders  are
presently  governed  by  Pennsylvania  law,  the  Pioneer  American  Articles of
Incorporation  and the Pioneer American bylaws. As stockholders of NBT following
the merger, the rights of former Pioneer American  stockholders will be governed
by Delaware law, the NBT Certificate of  Incorporation  and the NBT bylaws.  The
following  chart  summarizes  the  material  differences  between  the rights of
holders of Pioneer  American  common stock prior to and after  completion of the
merger. You can obtain copies of the governing corporate  instruments of NBT and
Pioneer  American,  without charge,  by following the instructions  listed under
"Where You Can Find More Information."

                                       100

<PAGE>


<TABLE>
<CAPTION>
                                  PIONEER AMERICAN STOCKHOLDERS'         PIONEER AMERICAN STOCKHOLDERS'
                                        RIGHTS PRE-MERGER                       RIGHTS POST-MERGER
                                  ------------------------------         ------------------------------
<S>                         <C>                                          <C>
Special Meeting of          Under Pioneer American's Bylaws,             Stockholders may call a special meeting of
Stockholders                special meetings of the stockholders         stockholders at the written request of the
                            may be called at any time by the board       holders of at least 50% of all shares
                            of directors or by any three or more         entitled to vote at the meeting.
                            stockholders  entitled to cast at least
                            twenty-five (25%) of the vote which all
                            stockholders are entitled to cast at a
                            particular meeting.

Inspection of Voting        Stockholders may inspect a list of           Stockholders may inspect a list of
List of Stockholders        stockholders entitled to vote at a           stockholders at least ten days before the
                            meeting of stockholders at the time and      meeting for which the list was prepared
                            place of the meeting and during the          and at the time and place of the meeting
                            whole time of the meeting.                   and during the whole time of the meeting.

Classification  of the      The  Pioneer  American  Board is divided     The NBT Board is divided into three
Board of Directors          into four classes, with directors in each    classes, with directors in each class being
                            class being elected for staggered four-      elected for staggered three-year terms.
                            year terms.

Election of the Board       Directors are elected by a plurality of      Directors are elected by a plurality of the
of Directors                the votes cast.                              votes cast.

Removal of Directors        Stockholders may remove a director           Stockholders may remove a director only
                            only for cause by the affirmative vote of    for cause by the affirmative vote of a
                            at least 75% of shareholders entitled to     majority in voting power of the
                            cast votes.                                  stockholders entitled to vote and to be
                                                                         present at the meeting called for such
                                                                         purpose.

Vacancies on the Board      Stockholders may fill vacancies, created     Stockholders may fill vacancies at a
of Directors                by stockholders' removal of a director,      stockholders' meeting.  Directors may fill
                            at a stockholders' meeting. Directors        vacancies by a majority vote of the
                            may fill vacancies, including vacancies      directors then in office. The director
                            resulting from an increase in the number     chosen by the current directors to fill the
                            of directors, by a majority vote of the      vacancy holds the office until the time of
                            directors  then in office.  The director     the next election of  directors,  at which
                            chosen by the current directors to fill the  point the stockholders shall fill the
                            vacancy holds the office for the             vacancy for the remainder of the
                            unexpired term of the class to which         unexpired term of office. Directors may
                            they are elected.                            also fill newly-created directorships other
                                                                         than an increase by more than three in the
                                                                         number of directors.
</TABLE>

                                       101

<PAGE>


<TABLE>
<CAPTION>
                                  PIONEER AMERICAN STOCKHOLDERS'         PIONEER AMERICAN STOCKHOLDERS'
                                        RIGHTS PRE-MERGER                       RIGHTS POST-MERGER
                                  ------------------------------         ------------------------------
<S>                         <C>                                          <C>
Liability of Directors      Directors are not personally liable to       Directors are not personally liable to NBT
                            Pioneer American or its stockholders for     or its stockholders for monetary damages
                            monetary damages for any action taken        for breaches of fiduciary duty, except (1)
                            or for any failure to take any action,       for breach of the director's duty of loyalty,
                            unless the director has breached or          (2) for acts and omissions not in good faith
                            failed to perform his or her fiduciary       or which involve intentional misconduct or
                            duties of loyalty, good faith and due care   a knowing violation of law, (3) for
                            and the breach or failure to perform         unlawful payments of dividends or
                            constitutes self-dealing, willful            unlawful stock purchases or redemptions
                            misconduct or recklessness.  The             or (4) for any transaction where the
                            foregoing does not apply to the              director received an improper personal
                            responsibility or liability of a director    benefit.
                            pursuant to a criminal statute or the
                            liability of a director for the payment of
                            taxes pursuant to local, state or federal
                            law.

Indemnification of          A Pioneer American director, officer,        An NBT director or officer is entitled to
Directors, Officers,        employee or agent is entitled to             indemnification if he or she acted in good
Employees or Agents         indemnification if he or she acted in        faith and in a manner he or she reasonably
                            good faith and in a manner he or she         believed to be in, or not opposed to, the
                            reasonably believed to be in, or not         best interest of NBT and, with respect to
                            opposed to, the best interest of Pioneer     any criminal action or proceeding, had no
                            American and, with respect to any            reasonable cause to believe his or her
                            criminal action or proceeding, had no        conduct was unlawful.
                            reasonable cause to believe his or her
                            conduct was unlawful.

Restrictions upon           No merger, consolidation, liquidation or     Any business combination involving NBT
Certain Business            dissolution of Pioneer American nor any      or a subsidiary and a major stockholder or
Combinations                action that would result in the sale or      affiliate requires the affirmative vote of
                            other disposition of all or substantially    the holders of not  less  than  80% of the
                            all of the assets of Pioneer American        outstanding shares of NBT common stock,
                            shall be valid unless first approved by      excluding the shares owned by the major
                            the affirmative vote of the holders of       stockholder and its affiliates. The
                            70% of the outstanding shares of             certificate defines "major stockholder" as
                            Pioneer American common stock.               any person who beneficially owns 5% or
                                                                         more of NBT's voting stock. This
                                                                         provision will not apply to a business
                                                                         combination involving a major
                                                                         stockholder or its affiliate if the business
                                                                         combination is approved by two-thirds of
                                                                         directors who were directors prior to the
                                                                         time when the major stockholder became a
                                                                         major stockholder.
</TABLE>

                                       102

<PAGE>


<TABLE>
<CAPTION>
                                  PIONEER AMERICAN STOCKHOLDERS'         PIONEER AMERICAN STOCKHOLDERS'
                                        RIGHTS PRE-MERGER                       RIGHTS POST-MERGER
                                  ------------------------------         ------------------------------
<S>                         <C>                                          <C>
Mergers, Share              No merger, consolidation, liquidation or     Any business combination that does not
Exchanges or Asset          dissolution of Pioneer American nor any      involve a major stockholder or an affiliate
Sales                       action that would result in the sale or      requires such vote, if any, as may be
                            other  disposition of all or substantially   required by Delaware law.
                            all of  the  assets  of  Pioneer American
                            shall be valid unless first approved by
                            the affirmative vote of the holders of
                            70% of the outstanding shares of
                            Pioneer American common stock.

Amendments to               Amendments which are proposed by             Amendments generally require approval of
Certificate or Articles     stockholders, and which have not been        a majority of the outstanding stock entitled
of Incorporation            previously approved by the Board of          to vote upon the amendment.  Any
                            Directors, shall require the affirmative     amendment to Article ELEVENTH
                            vote of at least 75% of the votes which      relating to business combinations requires
                            stockholders are entitled to cast.  Any      the affirmative vote of at least 80% of the
                            amendment to Article 12, relating to         outstanding shares of voting stock, and if
                            business combinations, requires the          there is a major stockholder, such 80%
                            affirmative vote of the holders of 70% of    vote must include the affirmative vote of at
                            the outstanding shares of Pioneer            least 80% of the outstanding shares of
                            American common stock.                       voting stock held by stockholders other
                                                                         than the major stockholder and its
                                                                         affiliates.

Amendments to Bylaws        A majority of the directors may make,        A majority of the directors, or
                            amend or repeal the bylaws.                  stockholders holding a majority of the
                                                                         outstanding shares entitled to vote, may
                                                                         make, amend or repeal the bylaws. The
                                                                         NBT bylaws permit the stockholders to
                                                                         adopt, approve or designate bylaws that
                                                                         may not be amended, altered or repealed
                                                                         except by a specified percentage in
                                                                         interest of all the stockholders or of a
                                                                         particular class of stockholders.

Appraisal/ Dissenters'      Pioneer American stockholders have           Stockholders generally do not have
Rights                      dissenters' rights to be paid in cash        the appraisal rights.
                            fair value of their Pioneer American
                            shares as a result of a business
                            combination.
</TABLE>

     The  following  discussion   summarizes  in  further  detail  the  material
differences  between the rights of holders of Pioneer  American common stock and
holders of NBT common stock. This summary does not purport to be complete and we
qualify  the  summary in its  entirety  by  reference  to the  Pioneer  American
Articles of Incorporation,  the Pioneer American bylaws,  the NBT Certificate of
Incorporation and the NBT bylaws and the relevant provisions of Pennsylvania and
Delaware law.

                                       103

<PAGE>


SPECIAL MEETINGS OF STOCKHOLDERS

     The Pioneer  American  bylaws provide that the board of directors or by any
three or more stockholders  entitled to cast at least 25% of the shares entitled
to vote at a  particular  meeting  may  call  special  meetings  of the  Pioneer
American stockholders.

     The NBT bylaws  provide  that the board of  directors,  the chairman of the
board  of  directors,  or the  holders  of not less  than 50% of all the  shares
entitled to vote at the meeting may call special meetings of the stockholders.

 INSPECTION OF VOTING LIST OF STOCKHOLDERS

     Pennsylvania  law  requires  Pioneer  American's  transfer  agent to make a
complete  list of the  stockholders  entitled  to vote at any meeting of Pioneer
American  stockholders,  arranged in alphabetical order, with the address of and
number of shares held by each stockholder.  This list shall be produced and kept
open at the time and place of the meeting and shall be subject to the inspection
of any stockholder during the whole time of the meeting.

     The NBT bylaws  provide that the  secretary  will make  available a list of
stockholders  entitled to notice of a stockholders meeting for inspection by any
stockholder,  at least ten days before the meeting  and  continuing  through the
meeting. In addition, any stockholder of record that is entitled to vote at that
meeting is entitled to inspect the list at any time during the meeting or at any
adjournment.  Delaware law provides  that any  stockholder  shall,  upon written
demand under oath stating the purpose of the demand, have the right during usual
business hours to inspect for any proper purpose the corporation's stock ledger,
a list of stockholders,  and its other books and records,  and to make copies or
extracts from this material.

CUMULATIVE VOTING

     Neither  the  Pioneer  American  Articles  of  Incorporation  nor  the  NBT
Certificate of  Incorporation  permits  stockholders to cumulate their votes for
the election of directors.

PREEMPTIVE RIGHTS

     Neither  Pioneer  American   stockholders  nor  NBT  stockholders   have  a
preemptive right to acquire or subscribe to any or all additional  issues of the
corporation's stock.

CLASSIFICATION OF THE BOARD OF DIRECTORS

     Both the Pioneer American Articles of Incorporation and the NBT Certificate
of  Incorporation  provide that their  respective  boards of directors are to be
classified  and divided  into four  classes in the case of Pioneer  American and
three  classes in the case of NBT, as nearly equal in number as  possible,  with
the  directors in each class being  elected for  staggered  four-year  terms and
three-year terms, respectively.

ELECTION OF THE BOARD OF DIRECTORS

     Under  Pennsylvania  law,  candidates  for Pioneer  American  director  who
receive the highest number of votes shall be elected. If at a meeting of Pioneer
American stockholders,  directors of more than one class are to be elected, each
class of directors shall be elected in a separate election.

     The NBT  bylaws  provide  that a  nominee  for  director  is  elected  by a
plurality of the votes present in person or by proxy and entitled to vote in the
election at a stockholders meeting at which a quorum is present.

                                       104

<PAGE>


REMOVAL OF DIRECTORS

     The Pioneer American bylaws provide that the stockholders may remove,  only
for  cause,  the  entire  board of  directors,  any  class of  directors  or any
individual  director by the affirmative vote of at least 75% of the stockholders
entitled to vote at a meeting called for this purpose.

     The NBT bylaws,  together with  applicable  Delaware law,  provide that the
stockholders  may  remove  any  director  at any time,  only for  cause,  by the
affirmative vote of a majority in voting power of the  stockholders  entitled to
vote and to be  present  in  person  or by proxy at a  special  meeting  of such
stockholders for such purposes and at which a quorum is present.

ADDITIONAL DIRECTORS AND VACANCIES ON THE BOARD OF DIRECTORS

     The Pioneer American Articles of Incorporation grant the board of directors
the power to fix and  determine the number of directors to be elected to each of
the four classes of directors.  If a vacancy on the board  occurs,  the majority
vote of the then  directors  can fill a vacancy.  Any director so elected by the
board of directors  shall hold office until the  unexpired  term of the class to
which he or she was elected.

     The NBT bylaws provide that the stockholders  entitled to vote at an annual
meeting shall determine the number of directors.  Between annual  meetings,  the
board of directors shall have the power to increase, by not more than three, the
number of directors. The bylaws provide that a majority of the directors then in
office may fill  vacancies  and  newly-created  directorships  (but no more than
three in any one year) and if at the time of the next  election of  directors by
the stockholders the term of office of any vacancy or newly-created directorship
filled by the remaining  directors has not expired,  then the stockholders shall
fill such vacancy for the remainder of the  unexpired  term.  Stockholders  also
have the general power to fill vacancies and  newly-created  directorships  at a
meeting called for that purpose.

LIABILITY OF DIRECTORS

     The Pioneer  American  bylaws  provide that no director shall be personally
liable for monetary  damages for any action taken or for any failure to take any
action, unless:

     o    the director has breached or failed to perform his fiduciary duties of
          loyalty, good faith and due care, and

     o    the breach or failure to  perform  constitutes  self-dealing,  willful
          misconduct or recklessness.

     The above bylaw provisions do not apply to the  responsibility or liability
of a director  pursuant to a criminal statute or the liability of a director for
the payment of taxes pursuant to local, state or federal law.

     The NBT  Certificate  of  Incorporation  provides that no director shall be
personally  liable to the corporation or its  stockholders  for monetary damages
for  breaches of  fiduciary  duty except  where such  exculpation  is  expressly
prohibited.  The NBT Certificate of Incorporation  provides that this limitation
does not apply to liability of a director in the following instances:

     o    breach of the  director's  duty of loyalty to the  corporation  or its
          stockholders;

     o    acts and  omissions  not in good  faith or which  involve  intentional
          misconduct or a knowing violation of law;

     o    unlawful  payments  of  dividends  and  unlawful  stock  purchases  or
          redemptions; or

                                       105

<PAGE>


     o    any transaction from which the director  derived an improper  personal
          benefit.

INDEMNIFICATION OF DIRECTORS, OFFICERS, EMPLOYEES AND AGENTS

     The Pioneer American  Articles of  Incorporation  provide that every person
who is or was a director,  officer,  employee or agent of Pioneer American or of
any other  corporation  which he served at the request of Pioneer American shall
be indemnified to the fullest extent  permitted by Pennsylvania  law against all
expenses and liabilities incurred by or imposed upon him or her.

     The NBT bylaws  provide  that NBT shall  indemnify  directors  and officers
against liability incurred by reason of the fact of service as such with NBT, or
by reason of the fact that they  served at the  request of NBT as a director  or
officer of another corporation or business entity, if the person acted

     o    in good faith and

     o    with the reasonable belief that

          o    his or her conduct when acting in the official  capacity was in
               the best interests of the corporation and

          o    in all other cases, the person's conduct was at least not opposed
               to the best interests of the corporation, and

     o    in any proceeding brought by a governmental  entity, the person had no
          reasonable cause to believe his or her conduct was unlawful.

     NBT may not,  however,  indemnify a director or officer against  judgments,
fines or amounts paid in settlement in connection with a proceeding by or in the
right of the corporation, and may not pay expenses in any such case in which the
person was adjudged  liable for  negligence or misconduct in the  performance of
his or her duty to the  corporation,  unless the court shall determine that such
person is fairly and reasonably entitled to indemnity.

     The NBT bylaws  also  provide  for the  mandatory  advancement  of expenses
incurred by an officer or director in defending a civil or criminal action, suit
or proceeding  in advance of the final  resolution of the matter upon receipt of
an  undertaking  by or on behalf of such officer or director to repay the amount
advanced if a court shall ultimately  determine that such person is not entitled
to indemnification as authorized in the bylaws.

     The NBT bylaws also provide  specific  deadlines  for the payment by NBT of
indemnification and advancement  obligations,  and specifically  contemplate the
filing of actions against NBT to enforce these obligations.

RESTRICTIONS UPON CERTAIN BUSINESS COMBINATIONS

     The Pioneer American Articles of Incorporation require the affirmative vote
of the holders of 70% of the outstanding shares of Pioneer American common stock
to approve any of the following:

     o    any merger or consolidation of the corporation

     o    the liquidation or dissolution of the corporation

     o    any  sale or  other  disposition  of all or  substantially  all of the
          assets of the corporation

     Pioneer American is also subject to several  provisions of the Pennsylvania
Business  Corporation Law, which governs business  combinations  with interested
stockholders. Subject to exceptions:

                                       106

<PAGE>


     o    following any  acquisition by any person or group of 20% of the shares
          of Pioneer American common stock, the remaining  stockholders have the
          right to receive  payment for their shares,  in cash, from such person
          or group in an amount equal to the fair value of the shares, including
          an  increment  representing  a  proportion  of any value  payable  for
          control of Pioneer American

     o    prohibit  for five  years,  a business  combination  which  includes a
          merger or consolidation or a sale, lease, or exchange of assets,  with
          a  stockholder  or group of  stockholders  who hold 20% or more of the
          shares of Pioneer American common stock

One of the exceptions to the 5-year prohibition of a business combination is the
approval by the Pioneer American Board of the business combination,  such as was
done by the Board's  approval of the merger  agreement  described  in this joint
proxy statement/prospectus.

     The NBT Certificate of  Incorporation  requires the affirmative vote of not
less than 80% of the voting power of all outstanding  shares of capital stock of
NBT entitled to vote and held by  disinterested  stockholders to authorize or to
approve any of the following business combinations:

     o    any  merger,   consolidation  or  other  business   reorganization  or
          combination  of  NBT  or  any  of  its  subsidiaries  with  any  other
          corporation that is a major stockholder of NBT;

     o    any sale, lease or exchange by NBT of all or a substantial part of its
          assets to or with a major stockholder;

     o    any  issue  of  any  stock  or  other  security  of  NBT or any of its
          subsidiaries  for cash,  assets or securities of a major  stockholder;
          and

     o    any reverse stock split of, or exchange of  securities,  cash or other
          properties  or assets or any  outstanding  securities of NBT or any of
          its  subsidiaries  or  liquidation or dissolution of NBT or any of its
          subsidiaries  in any such case in which a major  stockholder  receives
          any  securities,  cash or other assets  whether or not different  from
          those  received or retained  by any holder of  securities  of the same
          class as held by such major stockholder.

     For these  purposes,  the term "major  stockholder"  means and includes any
person, corporation, partnership, or other person or entity which, together with
its affiliates and associates (as defined at Rule 12b-2 under the Exchange Act),
beneficially  owns in the  aggregate  5% or more of the  outstanding  shares  of
voting stock, and any affiliates or associates of any such person,  corporation,
partnership, or other person or entity.

     The term "substantial part" means more than 25% of the fair market value of
the total  consolidated  assets of the  corporation  in  question,  or more than
twenty-five  percent of the aggregate par value of authorized  and issued voting
stock of the  corporation  in question,  as of the end of its most recent fiscal
quarter ending prior to the time the determination is being made.

     The term "disinterested  stockholder" means any holder of voting securities
of the company other than

     o    a major  stockholder if it or any of them has a financial  interest in
          the  transaction  being  voted on  (except  for a  financial  interest
          attributable  solely to such person's interest as a stockholder of the
          company which is identical to the interests of all stockholders of the
          same class) and

     o    any major  stockholder  (whether  or not having a  financial  interest
          described  in clause  (i) of this  sentence)  if it or any of them has
          directly or indirectly proposed the transaction,  solicited proxies to
          vote in favor of the  transaction,  financed any such  solicitation of
          proxies or entered into any

                                       107

<PAGE>


          contract, arrangement, or understanding with any person for the voting
          of securities of the company in favor of the transaction.

     The certificate of incorporation  further provides that the provision shall
not apply to a business  combination  which is approved by  two-thirds  of those
members  of the NBT  Board who were  directors  prior to the time when the major
stockholder became a major stockholder.

     NBT is also subject to Section 203 of the Delaware General Corporation Law,
which governs business  combinations  with interested  stockholders.  Subject to
certain exceptions set forth in the law, Section 203 provides that a corporation
shall not engage in any business combination with any interested stockholder for
a  three-year  period  following  the time  that  such  stockholder  becomes  an
"interested stockholder" unless:

     o    prior to such time, the board of directors of the corporation approved
          either the business  combination or the  transaction  that resulted in
          the stockholder becoming an interested stockholder;

     o    the  interested  stockholder  acquires in the  transaction in which it
          became an interested  stockholder  at least 85% of the voting stock of
          the  corporation  outstanding  at the time the  transaction  commenced
          (excluding certain shares); or

     o    at or subsequent to such time, the business combination is approved by
          the board of directors of the corporation and by the affirmative  vote
          of at least  two-thirds of the  outstanding  voting stock which is not
          owned by the interested stockholder.

     Except  as  specified  in  the  law,  Section  203  defines  an  interested
stockholder to mean any person that

     o    (A) is the owner of 15% or more of the outstanding voting stock of the
          corporation or

     o    (B) is an affiliate or associate of the  corporation and was the owner
          of 15% or more of the  outstanding  voting stock of the corporation at
          any time within three years immediately prior to the relevant date, or
          any affiliate or associate of such person referred to in (A) or (B) of
          this sentence.

     Under  certain  circumstances,  Section 203 makes it more  difficult for an
interested   stockholder  to  effect  various  business   combinations   with  a
corporation for a three-year period,  although the stockholders may, by adopting
an amendment to the corporation's charter or bylaws, elect not to be governed by
this section, effective one year after adoption. NBT has not made this election.

MERGERS, SHARE EXCHANGES OR ASSET SALES

     Other than as  discussed  in the  previous  section,  the Pioneer  American
Articles of Incorporation are silent regarding a plan of merger,  consolidation,
liquidation,   dissolution  or  sale  of   substantially   all  of  the  assets.
Pennsylvania law requires the approval of the board of directors and the holders
of a majority of the outstanding  shares of Pioneer American common stock, for a
particular  transaction  to be effective,  unless the Articles of  Incorporation
require a higher stockholder vote.

     Other than as discussed in the previous  section,  the NBT  Certificate  of
Incorporation  is  silent  regarding  a plan  of  merger,  consolidation,  share
exchange,  sale of all or substantially  all of NBT's assets,  and the like. The
provisions of the Delaware  General  Corporation Law govern these  transactions.
Delaware  law  generally   requires  the  approval  of  the  directors  and  the
affirmative vote of the holders of a majority of the outstanding  stock entitled
to vote on the proposal for the particular  transaction to be effective,  unless
the  certificate  of  incorporation  requires  a  higher  stockholder  vote.  In
addition, Delaware law provides that action by the stockholders of the surviving
corporation in a merger is not necessary if each of the following  conditions is
satisfied:

                                       108

<PAGE>


     o    the agreement of merger does not amend in any respect the  certificate
          of incorporation of such constituent corporation;

     o    each  share  of  stock  of such  constituent  corporation  outstanding
          immediately  prior to the  effective  date of the  merger  is to be an
          identical  outstanding or treasury share of the surviving  corporation
          after the effective date of the merger; and

     o    either (x) no shares of common stock of the surviving  corporation and
          no shares,  securities or obligations  convertible into such stock are
          to be  issued  or  delivered  under  the  plan of  merger,  or (y) the
          authorized  unissued  shares or the treasury shares of common stock of
          the surviving  corporation to be issued or delivered under the plan of
          merger plus those  initially  issuable  upon  conversion  of any other
          shares, securities or obligations to be issued or delivered under such
          plan  do  not  exceed  20% of the  shares  of  common  stock  of  such
          constituent corporation outstanding immediately prior to the effective
          date of the merger.

     Under  Delaware  law,  the board of  directors  may also  effect  without a
stockholder  vote a merger into NBT of a corporation of which 90% or more of the
outstanding stock entitled to vote on the merger is owned by NBT.

AMENDMENTS TO CERTIFICATE AND ARTICLES OF INCORPORATION

     The Pioneer  American  Articles of  Incorporation  provide that  amendments
which are proposed by stockholders,  and which have not been previously approved
by the Pioneer  American Board,  shall require the affirmative  vote of at least
75% of the votes which  stockholders  are  entitled to cast.  Any  amendment  to
Article 12, relating to business combinations,  requires the affirmative vote of
the holders of at least 70% of the outstanding shares of Pioneer American common
stock.

     The NBT Certificate of Incorporation provides that, except as stated in the
next succeeding  sentence,  the laws of Delaware shall govern amendment of NBT's
Certificate of Incorporation. The Delaware General Corporation Law provides that
amendments to the certificate of incorporation require the approval of the board
of directors and the  affirmative  vote of a majority of the  outstanding  stock
entitled to vote on the  amendment,  together with the vote of a majority of the
outstanding shares of a particular class in certain  circumstances  specified in
the statute.  NBT's Certificate of Incorporation states that amendment or repeal
of Article ELEVENTH (regarding  business  combinations with a major stockholder)
requires the affirmative vote of not less than 80% of the outstanding  shares of
NBT's voting stock;  provided that if there is a major stockholder as defined by
Article  ELEVENTH,  such 80% vote must include the affirmative  vote of at least
80% of the outstanding  shares of voting stock held by  stockholders  other than
the major stockholder.

AMENDMENTS TO BYLAWS

     The Pioneer  American  bylaws  provide that a majority of the directors may
amend or repeal the bylaws.  Under Pennsylvania law, the stockholders can change
any amendment to the bylaws made by the board of directors.

     The NBT bylaws provide that a majority of the directors may amend or repeal
the NBT bylaws. The stockholders of NBT may amend or repeal the bylaws by a vote
of a majority of the total number of issued and  outstanding  shares entitled to
vote. The NBT bylaws state that the stockholders may provide that certain bylaws
adopted,  approved or designated by them may not be amended, altered or repealed
except by a certain specified  percentage in interest of all the stockholders or
of a particular  class of  stockholders.  The  enforceability  of that provision
under Delaware law is unclear.

                                       109

<PAGE>


APPRAISAL/DISSENTERS' RIGHTS

     The holders of record of Pioneer  American common stock as of the effective
time of the merger will have dissenters'  rights with respect to the merger. See
"Rights of Dissenting Stockholders."

     Under the Delaware General  Corporation Law, appraisal rights are available
in  connection  with a  statutory  merger or  consolidation  except  in  certain
specified   situations.   Unless  otherwise   provided  in  the  certificate  of
incorporation,  no  appraisal  rights are  available to holders of shares of any
class of stock which is either:

     o    listed on a national  securities  exchange or designated as a national
          market system security on an inter-dealer quotation system by the NASD
          or

     o    held  of  record  by  more  than  2,000   stockholders,   unless  such
          stockholders  are  required  by the  terms  of the  merger  to  accept
          anything other than:

          o    shares of stock of the surviving corporation;

          o    shares of stock of  another  corporation  which are or will be so
               listed on a  national  securities  exchange  or  designated  as a
               national  market  system  security on an  inter-dealer  quotation
               system  by the  NASD  or  held  of  record  by  more  than  2,000
               stockholders;

          o    cash in lieu of fractional shares of such stock; or

          o    any combination of the foregoing.

     NBT's Certificate of Incorporation makes no provision for appraisal rights;
thus,  the  provisions of Delaware law set forth above are applicable to NBT and
its stockholders.


                        RIGHTS OF DISSENTING STOCKHOLDERS

     NBT  stockholders  will not be entitled to appraisal  rights under Delaware
law.

     Pioneer American  stockholders will have dissenters' rights to dissent from
the merger  agreement and obtain the fair value of their Pioneer American shares
in cash in accordance with the procedures established by Pennsylvania law.

     Any Pioneer  American  stockholder who  contemplates  exercising a holder's
right to dissent is urged to read  carefully  the  provisions of Subchapter D of
Chapter 15 of the Pennsylvania  Business  Corporation Law attached to this joint
proxy  statement/prospectus  as  Appendix D. The  following  is a summary of the
steps to be taken if the right to dissent is to be exercised, and should be read
in  connection  with the full text of the law found at Appendix D. A  dissenting
stockholder must take each step in the indicated order and in strict  compliance
with the  provisions  of the law in order to  perfect  dissenters'  rights.  The
failure of a Pioneer American  stockholder to comply with these procedural steps
will result in the  stockholder  receiving  NBT shares in  exchange  for Pioneer
American  shares  based on the  exchange  ratio in the event  that the merger is
completed.  See "The Issuance of NBT Common Stock in the Merger and Ratification
of the Merger Agreement - Merger Consideration."

     Any  written  notice of demand  which is required  in  connection  with the
exercise of  dissenters'  rights,  whether before or after the effective date of
the merger,  must be sent to Pioneer  American  Holding  Company Corp., 41 North
Main Street, Carbondale, Pennsylvania 18407, Attention: Chief Executive Officer.

                                       110

<PAGE>


STEP ONE - NOTICE OF INTENTION TO DISSENT

     A Pioneer American  stockholder must file with Pioneer  American,  prior to
the vote on the merger  agreement at the Pioneer  American  special  meeting,  a
written  notice of intention to demand payment in cash of the fair value of such
holder's Pioneer  American stock if the merger is consummated.  Such stockholder
cannot change in any manner the ownership of the Pioneer American stock from the
date of this notice through to the effective date of the merger and must refrain
from voting his,  her or its Pioneer  American  stock for approval of the merger
agreement.  Neither a proxy  nor a vote  against  approval  of the  merger  will
constitute the necessary written notice of intention to dissent.

STEP TWO - NOTICE TO DEMAND PAYMENT

     If the merger agreement is approved by the Pioneer  American  stockholders,
Pioneer American will mail a notice to all dissenters who gave notice under Step
One above and who  refrained  from voting for approval of the merger  agreement.
This notice will state where and when:  (1) a dissenter must send written demand
for payment;  and (2) the dissenters'  stock  certificates  are to be deposited.
This  notice  will  include  a form  for this  demand  and  another  copy of the
Pennsylvania law that is found at Appendix D.

STEP THREE - FAILURE TO COMPLY WITH THE NOTICE TO DEMAND PAYMENT

     A dissenter who fails to send back to Pioneer American the notice to demand
payment and deposit his or her stock  certificates by the deadline stated on the
form of notice to demand payment will forfeit his or her dissenters'  rights for
a cash payment and receive NBT shares.

STEP FOUR - PAYMENT OF FAIR VALUE OF PIONEER AMERICAN SHARES

     After the effective time of the merger,  NBT will give to dissenters notice
of the estimated fair value of their Pioneer American shares and pay such amount
or indicate that no remittance accompanies the notice. In addition,  this notice
will include:

     o    a closing  balance sheet and  statement of income of Pioneer  American
          for the most recent fiscal year and calendar quarterly period;

     o    a statement  expressing  the estimate of the fair value of the Pioneer
          American shares; and

     o    a notice of the right of a dissenter to demand a supplemental  payment
          under  Pennsylvania law and another copy of the Pennsylvania law which
          we attach as Appendix D.

STEP FIVE - ESTIMATE BY DISSENTER OF FAIR VALUE OF SHARES

     If a dissenter  feels that the  estimated  value or the amount sent is less
than the fair value,  a dissenter may send to NBT his or her own estimate of the
fair value of the Pioneer  American  shares,  which is deemed to be a demand for
payment of the amount of the deficiency.  If NBT remits payment of its estimated
value and the  dissenter  does not file his or her own  estimate  within 30 days
after the mailing of such payment to the  dissenter,  then the dissenter will be
entitled to no more than the amount mailed to him or her.

STEP SIX - VALUATION PROCEEDINGS

     If any demands for payment remain unsettled within 60 days after the latest
to occur of:

     o    the effective date of the merger;

     o    receipt of Pioneer American or NBT of any demands for payment; or

                                       111

<PAGE>


     o    receipt by Pioneer  American or NBT of any  estimates by dissenters of
          the fair value;

then NBT may file an  application  in the  Court of Common  Pleas of  Lackawanna
County,  Pennsylvania,  requesting  that the fair value of the Pioneer  American
stock be  determined  by the  court.  In such  case,  all  dissenters,  wherever
residing,  whose  demands  have not been  settled,  shall be made parties to the
proceeding.  A copy of this court  application  will be served on each dissenter
who has not settled.

     If NBT fails to file the application,  then any dissenter, on behalf of all
dissenters  who have made a demand and who have not settled  their  claims,  may
file the  application  in the name of Pioneer  American  within a 30-day  period
after the  expiration  of the above 60-day  period and request the fair value be
determined by the court.  The fair value  determined by the court need not equal
the  dissenters'  estimate  of  fair  value.  If  no  dissenter  files  such  an
application,  then  each  dissenter  entitled  to do so  shall  be paid  Pioneer
American's  estimate  of the fair  value  and may only  start a legal  action to
recover  any amount not  previously  remitted  plus  interest at a rate that the
court finds fair.

     NBT, after the effective  date of the merger,  intends to negotiate in good
faith with any dissenting stockholders. If, after negotiation, a claim cannot be
settled, then NBT intends to file an application  requesting that the fair value
be determined by the court.

     The costs and expenses of any valuation proceeding in the court,  including
the  reasonable  compensation  and  expenses of any  appraiser  appointed by the
court,  will be  determined  by the court  and  assessed  against  NBT after the
merger,  except that any part of the costs and expenses may be  apportioned  and
assessed  against all or any of the dissenters who are parties to the proceeding
and whose actions the court funds to be dilatory, obdurate, arbitrary, vexatious
or in bad faith.

     PIONEER AMERICAN  STOCKHOLDERS  CONSIDERING SEEKING APPRAISAL BY EXERCISING
THEIR  DISSENTERS'  RIGHTS  SHOULD BE AWARE THAT THE FAIR VALUE OF THEIR PIONEER
AMERICAN COMMON STOCK DETERMINED UNDER  PENNSYLVANIA LAW COULD BE MORE THAN, THE
SAME AS, OR LESS THAN THEIR PRO RATA SHARE OF THE MERGER CONSIDERATION THAT THEY
ARE ENTITLED TO RECEIVE UNDER THE MERGER AGREEMENT IF THEY DO NOT SEEK APPRAISAL
OF THEIR PIONEER AMERICAN COMMON STOCK.

     The foregoing  discussion is not a complete  statement of the procedures to
be  followed by Pioneer  American  stockholders  desiring to exercise  appraisal
rights and,  because  exercise of such rights requires  strict  adherence to the
relevant  provisions  of  the  Pennsylvania   Business   Corporation  Law,  each
stockholder  desiring to exercise  appraisal  rights is advised  individually to
consult  the law (as  provided  in  Appendix  D to this joint  proxy  statement/
prospectus) and comply with the relevant provisions of the law.

     Pioneer American  stockholders wishing to exercise their dissenters' rights
should  consult their own counsel to ensure that they fully and properly  comply
with the requirements of Pennsylvania law.


                                  OTHER MATTERS

STOCKHOLDER PROPOSALS FOR ANNUAL MEETINGS

     Stockholder  proposals submitted pursuant to Rule 14a-8 of the Exchange Act
for  inclusion  in  NBT's  proxy  statement  for  the  2001  Annual  Meeting  of
Stockholders  must be received by NBT by November 15, 2000.  Each  proposal must
comply with the requirements as to form and substance established by the SEC for
such a proposal  to be included in the proxy  statement  and form of proxy.  SEC
rules set forth standards as to what  stockholder  proposals  corporations  must
include in a proxy statement for an annual meeting.

                                       112

<PAGE>


OTHER MATTERS

     As of the date of this  joint  proxy  statement/prospectus,  the NBT  Board
knows of no matters that will be presented for  consideration at the NBT meeting
other than as described in this joint proxy  statement/prospectus.  If any other
matters  shall  properly  come before the NBT  meeting  and be voted  upon,  the
enclosed  proxies  will be  deemed  to  confer  discretionary  authority  on the
individuals  named as proxies  therein to vote the  shares  represented  by such
proxies as to any such matters.  The persons named as proxies  intend to vote or
not to vote in accordance with the recommendation of the management of NBT.

     As of the  date of  this  joint  proxy  statement/prospectus,  the  Pioneer
American Board knows of no matters that will be presented for  consideration  at
the  Pioneer  American  meeting  other than as  described  in this  joint  proxy
statement/prospectus.  If any other  matters  shall  properly  come  before  the
Pioneer  American meeting and be voted upon, the enclosed proxies will be deemed
to confer discretionary authority on the individuals named as proxies therein to
vote the shares represented by such proxies as to any such matters.  The persons
named  as  proxies  intend  to  vote  or not to  vote  in  accordance  with  the
recommendation of the management of Pioneer American.


                                  LEGAL MATTERS

     The validity of the common stock to be issued in connection with the merger
and certain federal income tax consequences of the merger will be passed upon by
Duane,  Morris & Heckscher  LLP,  Washington,  D.C.


                                     EXPERTS

     The  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 joint proxy statement/prospectus and
registration  statement  in  reliance  upon the report of KPMG LLP,  independent
auditor, 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   incorporated   by   reference   in  this   joint   proxy
statement/prospectus  and registration  statement have been audited by KPMG LLP,
independent  auditors,  as indicated in their reports with respect thereto,  and
are included  herein in reliance  upon the  authority of said firm as experts in
accounting and auditing.


                       WHERE YOU CAN FIND MORE INFORMATION

     NBT and Pioneer American 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,  NW,  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 NBT's SEC filings at the Nasdaq National Market,
1735 K Street, N.W.,  Washington,  D.C.  20006-1500,  and Pioneer American's SEC
filings  at  Nasdaq,  1735 K Street,  N.W.,  Washington,  D.C.  20006-1500.  Our
Internet addresses are (www.nbtbank.com) with respect to NBT and
(www.pioneeramerican.com) with respect to Pioneer American.

     NBT has filed a registration statement on Form S-4 to register with the SEC
the NBT common  stock to be issued to the  holders of  Pioneer  American  common
stock in the  merger.  This joint proxy  statement/prospectus  is a part of that
registration  statement and constitutes a prospectus of NBT in addition to being
a proxy statement of NBT and Pioneer American for the NBT annual meeting and the
Pioneer American special meeting. As allowed by SEC

                                       113

<PAGE>


rules,  this  joint  proxy   statement/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 joint
proxy   statement/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
joint  proxy  statement/prospectus,  except for any  information  superseded  by
information  in  this  joint  proxy   statement/prospectus.   This  joint  proxy
statement/prospectus  incorporates  by reference  the  documents set forth below
that we have previously  filed with the SEC. These documents  contain  important
information about the companies, their finances and NBT common stock.

NBT BANCORP INC. SEC FILINGS

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

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

PIONEER AMERICAN HOLDING COMPANY CORP. SEC FILINGS

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

     o    Current Report on Form 8-K, filed with the SEC on January 4, 2000.

     We incorporate by reference  additional documents that we file with the SEC
pursuant to Sections  13(a),  13(c), 14 or 15(d) of the Exchange Act between the
date of this joint  proxy  statement/prospectus  and the  effective  time of the
merger.

     NBT has supplied all information  contained or incorporated by reference in
this joint proxy statement/prospectus  relating to NBT, and Pioneer American has
supplied all such information relating to Pioneer American.

     If you are a  stockholder,  we may  have  sent  you  some of the  documents
incorporated by reference, but you can obtain any of them through us or the SEC.
You can obtain  documents  incorporated  by  reference  from us without  charge,
excluding all exhibits unless we have specifically  incorporated by reference an
exhibit  in this  joint  proxy  statement/prospectus.  Stockholders  may  obtain
documents incorporated by reference in this joint proxy  statement/prospectus by
requesting  them in writing or by telephone  from the  appropriate  party at the
following address:

NBT Bancorp Inc.                          Pioneer American Holding Company Corp.
52 South Broad Street                     41 North Main Street
Norwich, New York 13815                   Carbondale, PA 18407
Attention: Michael J. Chewens, CPA        Attention: Patricia A. Cobb, Esq.
Tel: (607) 337-6520                       Tel: (570) 282-8045

     If you would like to request documents from us, please do so by May 9, 2000
to receive  them prior to the NBT annual  meeting and Pioneer  American  special
meeting.

                                       114

<PAGE>


     YOU  SHOULD  RELY ONLY ON THE  INFORMATION  CONTAINED  OR  INCORPORATED  BY
REFERENCE IN THIS JOINT PROXY  STATEMENT/PROSPECTUS  TO VOTE ON THE NBT PROPOSAL
AND THE PIONEER AMERICAN PROPOSAL.  WE HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU
WITH  INFORMATION  THAT IS DIFFERENT  FROM WHAT IS CONTAINED IN THIS JOINT PROXY
STATEMENT/PROSPECTUS.  THIS JOINT PROXY  STATEMENT/PROSPECTUS  IS DATED APRIL 3,
2000. YOU SHOULD NOT ASSUME THAT THE  INFORMATION  CONTAINED IN THIS JOINT PROXY
STATEMENT/PROSPECTUS  IS  ACCURATE  AS OF ANY DATE  OTHER  THAN SUCH  DATE,  AND
NEITHER THE MAILING OF THIS JOINT PROXY STATEMENT/PROSPECTUS TO STOCKHOLDERS NOR
THE  ISSUANCE  OF SHARES OF NBT  COMMON  STOCK IN THE  MERGER  SHALL  CREATE ANY
IMPLICATION TO THE CONTRARY.




                                       115

<PAGE>


                UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS

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

     The unaudited pro forma combined financial  statements were prepared giving
effect to the merger on the pooling of interests  accounting method.  Under this
method of accounting,  the recorded assets,  liabilities,  stockholders' equity,
income and expense of NBT 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 combined  statements of income do not reflect potential  operating expense
reductions or revenue  enhancements that are expected to result from the merger,
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  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 and Pioneer
American  and the  supplemental  consolidated  financial  statements  of NBT and
accompanying  notes, which have been restated to include the effects of the Lake
Ariel merger,  which we incorporate by reference herein. The unaudited pro forma
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 consummated on December 31, 1999 or at the beginning of the periods or that
may be attained in the future.


                                       116

<PAGE>


                   UNAUDITED PRO FORMA COMBINED BALANCE SHEET

<TABLE>
<CAPTION>
                                                                                         DECEMBER 31, 1999
                                                                -------------------------------------------------------------------
                                                                                     PIONEER                             NBT
                                                                                     AMERICAN                          PIONEER
                                                                       NBT           HOLDING        PRO FORMA          COMBINED
                                                                  BANCORP INC.    COMPANY CORP.    ADJUSTMENTS        PRO FORMA
                                                                --------------- ---------------- --------------- ------------------
                                             (in thousands)
<S>                                                               <C>              <C>              <C>             <C>
ASSETS
Cash and cash equivalents                                         $    64,431      $    15,198      $        --     $    79,629
Securities available for sale, at fair value                          520,440          112,134               --         632,574
Securities held to maturity (fair value-NBT Bancorp Inc
   $75,155, and Pioneer American Holding Company Corp.
   $35,499)                                                            78,213           36,612               --         114,825
Loans                                                               1,222,654          244,213               --       1,466,867
Less allowance for loan losses                                         16,654            3,057               --          19,711
                                                                  -----------      -----------      -----------     -----------
   Net loans                                                        1,206,000          241,156               --       1,447,156
Premises and equipment, net                                            40,830            6,267               --          47,097
Other assets                                                           51,518            7,408            3,300 4        62,226
                                                                  -----------      -----------      -----------     -----------
TOTAL ASSETS                                                      $ 1,961,432      $   418,775      $     3,300     $ 2,383,507
                                                                  ===========      ===========      ===========     ===========

LIABILITIES AND STOCKHOLDERS' EQUITY
Deposits:
   Demand (noninterest bearing)                                   $   223,143      $    44,752      $        --     $   267,895
   Savings, NOW, and money market                                     487,746          117,588               --         605,334
   Time                                                               766,729          137,133               --         903,862
                                                                  -----------      -----------      -----------     -----------
      Total deposits                                                1,477,618          299,473               --       1,777,091
   Short-term borrowings                                              137,567            4,700               --         142,267
   Long-term debt                                                     172,575           79,395               --         251,970
   Other liabilities                                                   13,798            3,609           12,300 4        29,707
                                                                  -----------      -----------      -----------     -----------
      Total liabilities                                             1,801,558          387,177           12,300       2,201,035
                                                                  -----------      -----------      -----------     -----------

  Commitments and contingencies

Stockholders' equity:
   Preferred stock                                                         --               --               --              --
   Common stock                                                        18,489            2,935            2,235 4        23,659
   Capital surplus                                                    148,242           11,962           (3,965)4       156,239
   Retained earnings                                                   23,060           21,889           (9,000)4        35,949
   Accumulated other comprehensive income (loss)                      (18,252)          (3,458)              --         (21,710)
   Common stock in treasury at cost                                   (11,665)          (1,730)           1,730         (11,665)
                                                                  -----------      -----------      -----------     -----------
      Total stockholders' equity                                      159,874           31,598           (9,000)        182,472
                                                                  -----------      -----------      -----------     -----------
      TOTAL LIABILITIES AND STOCKHOLDERS'
         EQUITY                                                   $ 1,961,432      $   418,775      $     3,300     $ 2,383,507
                                                                  ===========      ===========      ===========     ===========
</TABLE>

See accompanying notes to the unaudited pro forma combined financial statements.

                                       117

<PAGE>



                UNAUDITED PRO FORMA COMBINED STATEMENT OF INCOME

<TABLE>
<CAPTION>
                                                                  FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1999
                                                           ----------------------------------------------------------
                                                                            PIONEER
                                                                            AMERICAN                         NBT
                                                                NBT         HOLDING                        PIONEER
                                                              BANCORP       COMPANY       PRO FORMA        COMBINED
                                                                INC.         CORP.       ADJUSTMENTS      PRO FORMA
                                                           -------------  -----------  ---------------   ------------
Consolidated Statements of Income:
(in thousands, except per share data)
<S>                                                           <C>            <C>            <C>            <C>
Interest and fee income:
  Loans and loans held for sale                               $ 96,235       $ 19,661       $     --       $115,896
  Securities - taxable                                          34,956          8,223             --         43,179
  Securities - tax-exempt                                        3,210          1,268             --          4,478
  Other                                                            988            237             --          1,225
                                                              --------       --------       --------       --------
      Total interest and fee income                            135,389         29,389             --        164,778
                                                              --------       --------       --------       --------

Interest expense:
  Deposits                                                      46,067         10,519             --         56,586
  Short-term borrowings                                          5,999             12             --          6,011
  Long-term debt                                                 8,516          4,367             --         12,883
                                                              --------       --------       --------       --------
     Total interest expense                                     60,582         14,898             --         75,480
                                                              --------       --------       --------       --------
     Net interest income                                        74,807         14,491             --         89,298
     Provision for loan losses                                   5,070            370             --          5,440
                                                              --------       --------       --------       --------
     Net interest income after provision for loan losses        69,737         14,121             --         83,858
                                                              --------       --------       --------       --------

Noninterest income:
   Trust                                                         3,305             --             --          3,305
   Service charges on deposit accounts                           6,303          1,635             --          7,938
   Net securities gains                                          1,716             88             --          1,804
   Other                                                         5,097          1,108             --          6,205
                                                              --------       --------       --------       --------
      Total noninterest income                                  16,421          2,831             --         19,252
                                                              --------       --------       --------       --------

Noninterest expense:
   Salaries and employee benefits                               25,213          5,291             --         30,504
   Office supplies and postage                                   2,436            534             --          2,970
   Occupancy                                                     4,317          1,062             --          5,379
   Equipment                                                     4,230            990             --          5,220
   Professional fees and outside services                        3,325          1,005             --          4,330
   Data processing and communications                            4,091            437             --          4,528
   Amortization of intangible assets                             1,278             39             --          1,317
   Other operating                                               6,610          2,024             --          8,634
                                                              --------       --------       --------       --------
      Total noninterest expense                                 51,500         11,382             --         62,882
                                                              --------       --------       --------       --------
      Income before income taxes                                34,658          5,570             --         40,228
      Income taxes                                              12,483          1,488             --         13,971
                                                              --------       --------       --------       --------

         Net income                                           $ 22,175       $  4,082       $     --       $ 26,257
                                                              ========       ========       ========       ========

Weighted Average Shares Outstanding:
    Basic                                                       17,851          2,902             --         23,089
    Diluted                                                     18,095          2,929             --         23,382

Earnings per share:
    Basic                                                     $   1.24       $   1.41       $     --       $   1.14
    Diluted                                                   $   1.23       $   1.39       $     --       $   1.12
</TABLE>

See accompanying notes to the unaudited pro forma combined financial statements.

                                       118

<PAGE>


                UNAUDITED PRO FORMA COMBINED STATEMENT OF INCOME

<TABLE>
<CAPTION>
                                                                  FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1998
                                                           ----------------------------------------------------------
                                                                            PIONEER
                                                                            AMERICAN                         NBT
                                                                NBT         HOLDING                        PIONEER
                                                              BANCORP       COMPANY       PRO FORMA        COMBINED
                                                                INC.         CORP.       ADJUSTMENTS       PROFORMA
                                                           -------------  -----------  ---------------   ------------
Consolidated Statements of Income:
(in thousands, except per share data)
<S>                                                          <C>            <C>            <C>             <C>
Interest and fee income:
   Loans and loans held for sale                             $ 89,399       $ 19,093       $      --       $108,492
   Securities - taxable                                        37,590          7,615              --         45,205
   Securities - tax-exempt                                      2,780          1,114              --          3,894
   Other                                                          531            480              --          1,011
                                                             --------       --------       ---------       --------
      Total interest and fee income                           130,300         28,302              --        158,602
                                                             --------       --------       ---------       --------

Interest expense:
   Deposits                                                    48,058         10,840              --         58,898
   Short-term borrowings                                        6,153             23              --          6,176
   Long-term debt                                               6,206          3,456              --          9,662
                                                             --------       --------       ---------       --------
      Total interest expense                                   60,417         14,319              --         74,736
                                                             --------       --------       ---------       --------
      Net interest income                                      69,883         13,983              --         83,866
      Provision for loan losses                                 5,729            420              --          6,149
                                                             --------       --------       ---------       --------
      Net interest income after provision for
         loan losses                                           64,154         13,563              --         77,717
                                                             --------       --------       ---------       --------

Noninterest income:
   Trust                                                        3,115             --              --          3,115
   Service charges on deposit accounts                          5,325          1,404              --          6,729
   Net securities gains                                         1,056            511              --          1,567
   Other                                                        5,417          1,046              --          6,463
                                                             --------       --------       ---------       --------
      Total noninterest income                                 14,913          2,961              --         17,874
                                                             --------       --------       ---------       --------

Noninterest expense:
   Salaries and employee benefits                              24,215          5,071              --         29,286
   Office supplies and postage                                  2,523            506              --          3,029
   Occupancy                                                    4,132          1,027              --          5,159
   Equipment                                                    3,599            773              --          4,372
   Professional fees and outside services                       3,375          1,027              --          4,402
   Data processing and communications                           3,796            483              --          4,279
   Amortization of intangible assets                            1,275             39              --          1,314
   Other operating                                              7,665          2,041              --          9,706
                                                             --------       --------       ---------       --------
      Total noninterest expense                                50,580         10,967              --         61,547
                                                             --------       --------       ---------       --------
      Income before income taxes                               28,487          5,557              --         34,044
      Income taxes                                              5,614          1,535              --          7,149
                                                             --------       --------       ---------       --------

         Net income                                          $ 22,873       $  4,022       $      --       $ 26,895
                                                             ========       ========       =========       ========


Weighted Average Shares Outstanding:
   Basic                                                       17,976          2,894              --         23,199
   Diluted                                                     18,361          2,953              --         23,691

Earnings per share:
   Basic                                                     $   1.27       $   1.39       $      --       $   1.16
   Diluted                                                   $   1.25       $   1.36       $      --       $   1.14
</TABLE>

See accompanying notes to the unaudited pro forma combined financial statements.

                                       119

<PAGE>


                UNAUDITED PRO FORMA COMBINED STATEMENT OF INCOME

<TABLE>
<CAPTION>
                                                                          FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1997
                                                                   ----------------------------------------------------------
                                                                                    PIONEER
                                                                                    AMERICAN                         NBT
                                                                        NBT         HOLDING                        PIONEER
                                                                      BANCORP       COMPANY       PRO FORMA        COMBINED
                                                                        INC.         CORP.       ADJUSTMENTS       PROFORMA
                                                                   -------------  -----------  ---------------   ------------
Consolidated Statements of Income
(in thousands, except per share data)
<S>                                                                 <C>            <C>           <C>              <C>
Interest and fee income:
   Loans and loans held for sale                                    $  81,688      $  18,101     $       --       $  99,789
   Securities - taxable                                                35,779          7,063             --          42,842
   Securities - tax-exempt                                              2,757          1,023             --           3,780
   Other                                                                  607            320             --             927
                                                                    ---------      ---------     ----------       ---------
      Total interest and fee income                                   120,831         26,507             --         147,338
                                                                    ---------      ---------     ----------       ---------

Interest expense:
   Deposits                                                            45,629         11,337             --          56,966
   Short-term borrowings                                                6,693             10             --           6,703
   Long-term debt                                                       3,725          1,498             --           5,223
                                                                    ---------      ---------     ----------       ---------
      Total interest expense                                           56,047         12,845             --          68,892
                                                                    ---------      ---------     ----------       ---------
      Net interest income                                              64,784         13,662             --          78,446
      Provision for loan losses                                         4,285            535             --           4,820
                                                                    ---------      ---------     ----------       ---------
      Net interest income after provision for loan losses              60,499         13,127             --          73,626
                                                                    ---------      ---------     ----------       ---------

Noninterest income:
  Trust                                                                 2,675             --             --           2,675
   Service charges on deposit accounts                                  4,942          1,397             --           6,339
   Net securities gains (losses)                                         (123)           157             --              34
   Other                                                                3,973            907             --           4,880
                                                                    ---------      ---------     ----------       ---------
      Total noninterest income                                         11,467          2,461             --          13,928
                                                                    ---------      ---------     ----------       ---------

Noninterest expense:
   Salaries and employee benefits                                      22,111          5,040             --          27,151
   Office supplies and postage                                          2,250            507             --           2,757
   Occupancy                                                            3,754          1,026             --           4,780
   Equipment                                                            2,632            685             --           3,317
   Professional fees and outside services                               2,485            900             --           3,385
   Data processing and communications                                   2,966            456             --           3,422
   Amortization of intangible assets                                    1,505             39             --           1,544
   Other operating                                                      6,677          1,427             --           8,104
                                                                    ---------      ---------     ----------       ---------

      Total noninterest expense                                        44,380         10,080             --          54,460
                                                                    ---------      ---------     ----------       ---------
      Income before income taxes                                       27,586          5,508             --          33,094
      Income taxes                                                      9,406          1,500             --          10,906
                                                                    ---------      ---------     ----------       ---------
      Net income                                                    $  18,180      $   4,008     $       --       $  22,188
                                                                    =========      =========     ==========       =========


Weighted Average Shares Outstanding:
   Basic                                                               17,095          2,850             --          22,239
   Diluted                                                             17,393          2,939             --          22,698

Earnings per share:
   Basic                                                            $    1.06      $    1.41     $       --       $    1.00
   Diluted                                                          $    1.05      $    1.36     $       --       $    0.98
</TABLE>

See accompanying notes to the unaudited pro forma combined financial statements.

                                       120


<PAGE>



           NOTES TO UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS

     (1) Pro forma earnings per common share (EPS) have been calculated based on
the  weighted  average  number of shares  of NBT plus  additional  shares of NBT
assumed  to be  issued  in the  merger  in  exchange  for the  weighted  average
outstanding shares of Pioneer American for each  applicable  period based on the
exchange ratio of 1.805.

     (2) Pro forma entry to issue 1.805 shares of NBT Bancorp Inc.  Common Stock
in  exchange  for each share of Pioneer  American  Holding  Company  Corp Common
Stock.  The  stated  value of NBT  Bancorp  Inc.  Common  Stock to be  issued is
determined as follows:

<TABLE>
<S>                                                                                  <C>               <C>
NBT Bancorp Inc. common shares issued at December 31, 1999                                               18,488,347
Pioneer American Holding Company Corp common shares issued, after
         retirement of treasury stock
         (2,864,307 common shares times conversion
         ratio of 1.805)                                                                                  5,170,074
                                                                                                        -----------
Combined pro forma total common share issued                                                             23,658,421
Stated value per common share                                                                          $       1.00
                                                                                                       ------------
Combined pro forma total stated value                                                                  $ 23,658,421

Actual stated value of common stock at December 31, 1999:

NBT Bancorp Inc.                                                                     $ 18,488,347
Pioneer American Holding Company Corp
         (after retirement of treasury shares)                                          2,864,307      $ 21,352,654
                                                                                     ------------      ------------
Required increase in stated value                                                                      $  2,305,767
                                                                                                       ============

Entry to conform to stated value of common stock:
Surplus                                                                              $  2,305,767
Common stock                                                                                           $  2,305,767

Pro forma entry to retire treasury stock held by Pioneer
    (approximately 71,060 shares having a par value of $1.00 per share)
Common Stock                                                                         $     71,060
Surplus                                                                              $  1,658,739
Treasury Stock                                                                                         $  1,729,799

Summary of pro forma entries above

Surplus                                                                              $  3,964,506
Common stock                                                                                           $  2,234,707
Treasury Stock                                                                                         $  1,729,799
</TABLE>

                                       121

<PAGE>


     (3) Authorized,  issued and outstanding  share information is as follows at
December 31, 1999:

<TABLE>
<CAPTION>
                                                 NBT                   PIONEER            NBT/PIONEER PRO FORMA
                                                 ---                   -------            ---------------------
<S>                                          <C>                     <C>                     <C>
Preferred
   Authorized                                 2,500,000                      --               2,500,000
   Issued and Outstanding                            --                      --                      --

Common
   Stated Value                                   $1.00                   $1.00                   $1.00
   Authorized                                15,000,000(A)           25,000,000              15,000,000(A)
   Issued                                    18,488,347               2,935,367              23,658,421
   Outstanding                               17,949,411               2,864,307              23,119,485
</TABLE>

     (A) On February 17,  2000,  stockholders  of NBT Bancorp  Inc.  approved an
amendment  to  its  Certificate  of  Incorporation   increasing  the  number  of
authorized common shares from 15 million to 30 million.

     (4) The  unaudited pro forma  combined  balance sheet at December 31, 1999,
reflects  anticipated  merger and integration  costs for both the Lake Ariel and
Pioneer American  mergers.  Costs related to the Lake Ariel merger are estimated
to be in the range of $6.7 million to $7.7 million ($4.7 million to $5.7 million
after taxes) and 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).  These estimates  include  primarily  investment  banking,  legal,
accounting,  printing,  employee and  contract  termination  costs.  Anticipated
merger and  integration  cost  estimates  are not included in the  unaudited pro
forma 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
merger.

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

<TABLE>
<S>                                                                <C>              <C>
Lake Ariel
- ----------
Current Tax Receivable                                             $2,000,000
Retained Earnings                                                  $5,200,000
    Other Liabilities                                                                $7,200,000

Pioneer American
- ----------------
Current Tax Receivable                                             $1,300,000
Retained Earnings                                                  $3,800,000
    Other Liabilities                                                                $5,100,000

Summary of pro forma entries above
- ----------------------------------
Current Tax Receivable                                             $3,300,000
Retained Earnings                                                  $9,000,000
    Other Liabilities                                                               $12,300,000
</TABLE>



                                       122

<PAGE>



            CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

     NBT  and  Pioneer   American  have  used  and   incorporated  by  reference
"forward-looking  statements"  in this Joint Proxy  Statement/Prospectus.  Words
such as "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.  NBT and Pioneer  American have used these  statements to
describe our  expectations and estimates in various sections of this Joint Proxy
Statement/Prospectus, including:

     o    Summary -- Our Reasons for the Merger;

     o    Summary -- Selected Historical and Pro Forma Combined Financial Data;

     o    The Merger -- Background of the Merger;

     o    The Merger --  Recommendation  of the NBT Board and NBT's  Reasons for
          the Merger;

     o    The Merger -- Recommendation of the Pioneer American Board and Pioneer
          American's Reasons for the Merger;

     o    The Merger -- Opinion of NBT's Financial Advisor;

     o    The Merger -- Opinion of Pioneer American's Financial Advisor; and

     o    Unaudited Pro Forma Combined Financial Statements.

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

                                       123


<PAGE>


                                NBT BANCORP INC.

               PROXY SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

     The undersigned  hereby appoints James I. Dunne and Adelbert L. Button, and
either of them,  with full  power of  substitution,  proxies  to  represent  the
undersigned at the Annual Meeting of Stockholders of NBT Bancorp Inc. ("NBT") to
be held at the Holiday Inn Arena, 2-8 Hawley Street, Binghamton, New York on May
16, 2000 at 2:00 p.m. local time, or at any adjournment or postponement  thereof
(the  "Meeting"),  with  all  power  which  the  undersigned  would  possess  if
personally  present,  and to vote all  shares of NBT's  common  stock  which the
undersigned may be entitled to vote at said meeting upon the following proposals
described in the accompanying  joint proxy  statement/prospectus,  in accordance
with the following instructions and, at their discretion, upon any other matters
that may properly come before the Meeting.  THIS PROXY, WHEN PROPERLY  EXECUTED,
WILL BE VOTED AS DIRECTED BY THE UNDERSIGNED. IF NO DIRECTION IS INDICATED, THIS
PROXY WILL BE VOTED TO FIX THE NUMBER OF DIRECTORS AT TWELVE FOR THE ELECTION OF
THE NOMINEES FOR DIRECTOR  LISTED BELOW,  FOR  RATIFICATION  OF THE  INDEPENDENT
AUDITOR,  FOR  APPROVAL OF THE NBT EMPLOYEE  STOCK  PURCHASE  PLAN,  AND FOR THE
ISSUANCE  OF NBT  COMMON  STOCK IN THE  MERGER  AND  RATIFICATION  OF THE MERGER
AGREEMENT.

1.   Election of  Directors.  To fix the number of directors at twelve and elect
     the nominees listed below:

          [ ] FOR ALL NOMINEES                   [ ] WITHHOLD FROM ALL NOMINEES

William C. Gumble,  Bruce D. Howe,  Andrew S.  Kowalczyk,  Jr., Dan B. Marshman,
John G. Martines, John C. Mitchell

IF YOU DO NOT WISH YOUR  SHARES  VOTED  FOR A  PARTICULAR  NOMINEE,  DRAW A LINE
THROUGH THAT PERSON'S NAME ABOVE.

2.   To ratify the Board's  selection of KPMG LLP as NBT's  independent  auditor
     for 2000.

          [ ] FOR                [ ] AGAINST                   [ ] ABSTAIN

3.   To approve the NBT Employee Stock Purchase Plan.

          [ ] FOR                [ ] AGAINST                   [ ] ABSTAIN

4.   To  approve  the  issuance  by NBT  of  its  common  stock  to  the  former
     stockholders  of Pioneer  American  Holding Company Corp. in the merger and
     ratify the Agreement and Plan of Merger,  dated as of December 7, 1999, and
     amended as of March 7,  2000,  by and  between  NBT and  Pioneer  American,
     which,  if  completed,  would result in (a) the merger of Pioneer  American
     with a subsidiary  of NBT, (b) the  subsequent  merger of Pioneer  American
     into NBT,  and (c) the  issuance  of 1.805  shares of NBT  common  stock in
     exchange for each share of Pioneer  American  common stock,  and all of the
     matters contemplated by the merger agreement.

          [ ] FOR                [ ] AGAINST                   [ ] ABSTAIN

5.   The  proxies are  authorized  to vote in their  discretion  upon such other
     business that may properly come before the Meeting.

X  Please mark your
  votes as in this
  example.

(Continued and to be signed on reverse side) SEE REVERSE SIDE


<PAGE>



(Continued from other side)

     [ ]      Check here for address change and note change below

     [ ]      Check here if you plan to attend the Meeting

New address:
            ------------------------------------------------------------

  Date:                                    Signature(s)
       --------------------------

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

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

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

                                               Please   sign  here   exactly  as
                                               name(s)  appear(s)  on the  left.
                                               When    signing   as    attorney,
                                               executor, administrator, trustee,
                                               guardian,   or   in   any   other
                                               fiduciary  capacity,   give  full
                                               title.  If more  than one  person
                                               acts as trustee, all should sign.
                                               All joint owners must sign.


<PAGE>



                     PIONEER AMERICAN HOLDING COMPANY CORP.

                 PROXY SOLICITED ON BEHALF OF BOARD OF DIRECTORS

     The undersigned hereby appoints Daniel Corazzi,  John Kuna and Basil Telep,
or any one or more of them, with full power of  substitution,  proxies,  to vote
all  of  the  stock  of  Pioneer  American  Holding  Company  Corp.,  which  the
undersigned  is  entitled  to vote at the  Special  Meeting of  Stockholders  of
Pioneer American to be held at Heart Lake Lodge,  1299 Heart Lake Road,  Jermyn,
Pennsylvania  on May 16, 2000 at 10:00 a.m. local time and at any adjournment or
postponement  thereof.  THIS PROXY,  WHEN PROPERLY  EXECUTED,  WILL BE VOTED, AS
DIRECTED BY THE  UNDERSIGNED.  IF NO DIRECTION IS MADE, IT WILL BE VOTED FOR THE
FOLLOWING PROPOSAL.

1.   To approve the Agreement and Plan of Merger,  dated as of December 7, 1999,
     and amended as of March 7, 2000,  by and between  Pioneer  American and NBT
     Bancorp Inc. ("NBT"),  which would result in the merger of Pioneer American
     into NBT and the  issuance of 1.805  shares of NBT common stock in exchange
     for each share of Pioneer  American  common  stock,  and all of the matters
     contemplated by the merger agreement.

          [ ] FOR                [ ] AGAINST                   [ ] ABSTAIN

2.   The  proxies are  authorized  to vote in their  discretion  upon such other
     business  that may  properly  come  before  the  Pioneer  American  special
     meeting.

X  Please mark your
  votes as in this
  example.

(Continued and to be signed on reverse side) SEE REVERSE SIDE


<PAGE>


(Continued from other side)



  Date:                                    Signature(s)
       --------------------------

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

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

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


                                               Please   sign  here   exactly  as
                                               name(s)  appear(s)  on the  left.
                                               When    signing   as    attorney,
                                               executor, administrator, trustee,
                                               guardian,   or   in   any   other
                                               fiduciary  capacity,   give  full
                                               title.  If more  than one  person
                                               acts as trustee, all should sign.
                                               All joint owners must sign.

I plan to attend the Special Meeting:

Please mark (on reverse side),  sign and date, and mail in the enclosed  postage
paid envelope.


<PAGE>



                                   APPENDIX A






                          AGREEMENT AND PLAN OF MERGER

                                      AMONG

                                NBT BANCORP INC.

                            LEVON ACQUISITION COMPANY

                                       AND

                     PIONEER AMERICAN HOLDING COMPANY CORP.










                   December 7, 1999, as amended March 7, 2000


<PAGE>


                                Table of Contents

                                                                            Page
                                                                            ----
1.   Combination...............................................................1

     1.1      First Merger.....................................................1
     1.2      Effect of First Merger...........................................1
     1.3      Second Merger....................................................3
     1.4      Effect of Second Merger..........................................3
     1.5      Consideration for First Merger...................................4
     1.6      No Fractional Shares.............................................4
     1.7      Dividends; Interest..............................................4
     1.8      Designation of Exchange Agent....................................4
     1.9      Notice of Exchange...............................................5
     1.10     Acts to Carry Out This Merger Plan...............................5
     1.11     Treatment of Stock Options.......................................6
     1.12     Stock Option Agreement...........................................6
     1.13     Executive Officers and Directors of PAHC.........................6
     1.14     Employee Benefits................................................7
     1.15     Voting Agreements................................................7
     1.16     Optional Bank Merger Transaction.................................7

2.   Effective Time............................................................8

     2.1      PAHC Shareholder Approval........................................8
     2.2      NBT Shareholder Approval.........................................8
     2.3      Federal Reserve Approval.........................................8
     2.4      OCC Approval.....................................................8
     2.5      Pennsylvania Department of Banking Approval......................8
     2.6      Other Regulatory Approvals.......................................8
     2.7      Expiration of Stays..............................................9
     2.8      Mutual Agreement.................................................9

3.   Conditions Precedent to Performance of Obligations of the Parties.........9

     3.1      Regulatory Approvals.............................................9
     3.2      Registration Statement ..........................................9
     3.3      Approval by Shareholders of PAHC.................................9
     3.4      Approval by Shareholders of NBTB.................................9
     3.5      Federal Income Taxation..........................................9
     3.6      Adverse Legislation.............................................10
     3.7      Absence of Litigation...........................................10

4.   Conditions Precedent to Performance of the Obligations
              of NBTB.........................................................10

     4.1      Representations and Warranties; Performance of Obligations......10
     4.2      Opinion of PAHC Counsel.........................................10
     4.3      Opinion of PAHC Litigation Counsel..............................10
     4.4      No Adverse Developments.........................................10
     4.5      Consolidated Net Worth..........................................11
     4.6      Loan Loss Reserve...............................................11
     4.7      CRA Rating......................................................11


<PAGE>


                                                                            Page
                                                                            ----
     4.8      Employment Agreement............................................11
     4.9      Releases........................................................11
     4.10     Accounting Treatment............................................11
     4.11     Affiliates' Agreement...........................................11
     4.12     Fairness Opinion................................................12

5.   Conditions Precedent to Performance of Obligations of PAHC...............12

     5.1      Representations and Warranties; Performance of Obligations......12
     5.2      Opinion of NBTB Counsel.........................................12
     5.3      No Adverse Developments.........................................12
     5.4      Status of NBTB Common Stock.....................................12
     5.5      Change-in-Control Agreements....................................12
     5.6      Board of Directors..............................................12
     5.7      Fairness Opinion................................................12
     5.8      Accounting Treatment............................................13

6.   Representations and Warranties of PAHC...................................13

     6.1      Organization, Powers, and Qualification.........................13
     6.2      Execution and Performance of Agreement......................... 13
     6.3      Absence of Violations...........................................13
     6.4      Compliance with Agreements......................................14
     6.5      Binding Obligations.............................................14
     6.6      Absence of Default; Due Authorization...........................14
     6.7      Compliance with BHC Act; Certain Banking Regulatory Matters.....15
     6.8      Subsidiaries....................................................15
     6.9      Capital Structure...............................................16
     6.10     Articles of Incorporation, Bylaws, and Minute Books.............17
     6.11     Books and Records...............................................17
     6.12     Regulatory Approvals and Filings, Contracts, Commitments, etc...17
     6.13     Financial Statements............................................18
     6.14     Call Reports; Bank Holding Company Reports......................18
     6.15     Absence of Undisclosed Liabilities..............................18
     6.16     Absence of Certain Developments.................................19
     6.17     Reserve for Credit Losses.......................................19
     6.18     Tax Matters.....................................................19
     6.19     Consolidated Net Worth..........................................20
     6.20     Examinations....................................................21
     6.21     Reports.........................................................21
     6.22     FIRA Compliance and Other Transactions with Affiliates..........21
     6.23     SEC Registered Securities.......................................21
     6.24     Legal Proceedings...............................................21
     6.25     Absence of Governmental Proceedings.............................21

                                   - cxxxvii -

<PAGE>


                                                                            Page
                                                                            ----
     6.26     Federal Deposit Insurance.......................................22
     6.27     Other Insurance.................................................22
     6.28     Labor Matters...................................................22
     6.29     Employee Benefit Plans..........................................22
     6.30     Compensation....................................................23
     6.31     Fiduciary Activities............................................23
     6.32     Environmental Liability.........................................24
     6.33     Intangible Property.............................................24
     6.34     Real and Personal Property......................................25
     6.35     Loans, Leases, and Discounts....................................25
     6.36     Material Contracts..............................................25
     6.37     Employment and Severance Arrangements...........................25
     6.38     Material Contract Defaults......................................26
     6.39     Capital Expenditures............................................26
     6.40     Repurchase Agreements...........................................26
     6.41     Internal Controls: Year 2000 Problems...........................26
     6.42     Dividends.......................................................26
     6.43     Brokers and Advisers............................................26
     6.44     Interest Rate Risk Management Instruments.......................26
     6.45     Accounting Treatment............................................27
     6.46     COBRA Matters...................................................27
     6.47     Disclosure......................................................27
     6.48     Regulatory and Other Approvals..................................27

7.   Covenants of PAHC........................................................27

     7.1      Rights of Access................................................27
     7.2      Monthly and Quarterly Financial Statements;
                      Minutes of Meetings and Other Materials................ 28
     7.3      Extraordinary Transactions......................................28
     7.4      Preservation of Business........................................29
     7.5      Comfort Letter..................................................29
     7.6      Affiliates' Agreements..........................................29
     7.7      Pooling Treatment...............................................30
     7.8      Shareholders' Meeting...........................................30
     7.9      Dividend Coordination...........................................30
     7.10     Inconsistent Activities.........................................30
     7.11     COBRA Obligations...............................................31
     7.12     Updated Schedules...............................................31
     7.13     Subsequent Events...............................................31

8.   Representations and Warranties of NBTB...................................31

     8.1      Organization, Powers, and Qualification.........................31

                                  - cxxxviii -

<PAGE>


                                                                            Page
                                                                            ----
     8.2      Execution and Performance of Agreement..........................32
     8.3      Binding Obligations; Due Authorization..........................32
     8.4      Absence of Default..............................................32
     8.5      Capital Structure...............................................32
     8.6      Books and Records...............................................33
     8.7      Financial Statements............................................33
     8.8      Nasdaq Reporting................................................33
     8.9      Absence of Certain Developments.................................33
     8.10     Brokers and Advisers............................................33
     8.11     Disclosure......................................................33
     8.12     Regulatory and Other Approvals..................................34

9.   Covenants of NBTB........................................................34

     9.1      Rights of Access................................................34
     9.2      Securities Reports..............................................34
     9.3      Shareholders' Meeting...........................................34
     9.4      Nasdaq Approval.................................................34
     9.5      Options.........................................................34
     9.6      Indemnification of Directors and Officers.......................35
     9.7      Subsequent Events...............................................35

10.  Closing..................................................................35

     10.1     Place and Time of Closing.......................................35
     10.2     Events to Take Place at Closing.................................35

11.  Termination, Damages for Breach, Waiver, and Amendment...................36

     11.1     Termination by Reason of Lapse of Time..........................36
     11.2     Grounds for Termination.........................................36
     11.3     Effect of Termination...........................................38
     11.4     Waiver of Terms or Conditions...................................38
     11.5     Amendment.......................................................39

12.  General Provisions.......................................................39

     12.1     Allocation of Costs and Expenses................................39
     12.2     Mutual Cooperation..............................................39
     12.3     Form of Public Disclosures......................................40
     12.4     Confidentiality.................................................40
     12.5     Claims of Brokers...............................................40

                                   - cxxxix -

<PAGE>


                                                                            Page
                                                                            ----
     12.6     Information for Applications and Registration Statement.........40
     12.7     Standard of Materiality and of Material Adverse Effect..........41
     12.8     Adjustments for Certain Events..................................41
     12.9     Counterparts....................................................42
     12.10    Entire Agreement................................................42
     12.11    Survival of Representations, Warranties, and Covenants..........42
     12.12    Section Headings................................................42
     12.13    Notices.........................................................42
     12.14    Choice of Law and Venue.........................................43
     12.15    Knowledge of a Party............................................43
     12.16    Binding Agreement...............................................43

EXHIBIT I             -    STOCK OPTION AGREEMENT

EXHIBIT II            -    VOTING AGREEMENT

EXHIBIT III           -    BANK MERGER AGREEMENT

EXHIBIT IV(a)         -    OPINION OF BLANK ROME COMISKY & MCCAULEY LLP

EXHIBIT IV(b)         -    OPINION OF PATRICIA A. COBB, ESQ.

EXHIBIT V             -    OPINION OF PAHC LITIGATION COUNSEL

EXHIBIT VI            -    EMPLOYMENT AGREEMENT

EXHIBIT VII           -    AFFILIATES' AGREEMENTS

EXHIBIT VIII          -    OPINION OF DUANE, MORRIS & HECKSCHER LLP

EXHIBIT IX            -    CHANGE-IN-CONTROL-AGREEMENT

                                     - cx1 -

<PAGE>


                          AGREEMENT AND PLAN OF MERGER
                                   AS AMENDED

     THIS  AGREEMENT  AND PLAN OF MERGER made as of the seventh day of December,
1999,  as amended as of the seventh day of March,  2000,  among NBT BANCORP INC.
("NBTB"),  a Delaware  corporation  having its principal office in Norwich,  New
York, LEVON ACQUISITION  COMPANY  ("Newco"),  a Delaware  corporation having its
principal  office in Norwich,  New York, and PIONEER  AMERICAN  HOLDING  COMPANY
CORP.  ("PAHC"),  a  Pennsylvania  corporation  having its  principal  office in
Carbondale, Pennsylvania


                          W I T N E S S E T H  T H A T :

     WHEREAS, NBTB and PAHC are bank holding companies which desire to affiliate
with each other through the merger of Newco with and into PAHC,  with PAHC to be
the surviving corporation (the "First Merger"),  and the immediately  subsequent
merger of PAHC into NBTB, with NBTB to be the surviving corporation (the "Second
Merger")  (the First  Merger  and the Second  Merger  being  referred  to herein
collectively as the "Merger");

     WHEREAS,  the Board of Directors of PAHC has determined that it would be in
the best  interests of PAHC,  its  shareholders,  its  customers,  and the areas
served by PAHC to become affiliated with NBTB through the Merger;

     WHEREAS,  subject to the terms and conditions hereof, the respective Boards
of  Directors  of NBTB and PAHC have agreed to cause the Merger  pursuant to the
provisions of section 251 et seq. of the Delaware  General  Corporation Law (the
"GCL") and section 1921 et seq. of the  Pennsylvania  Business  Corporation  Law
(the "BCL");

     WHEREAS, the parties intend that the Merger qualify as one or more tax-free
reorganizations  under section  368(a) of the Internal  Revenue Code of 1986, as
amended (the "Code"), and that the business  combination  contemplated hereby be
accounted for under the "pooling-of-interests" accounting method; and

     WHEREAS,  the parties desire to make certain  representations,  warranties,
and  agreements  in  connection  with the Merger and also to  prescribe  certain
conditions to the Merger;

     NOW,  THEREFORE,   in  consideration  of  these  premises  and  the  mutual
agreements  hereinafter  set forth,  intending to be legally bound,  the parties
agree as follows:

1.   COMBINATION.

     1.1. First Merger. Subject to the provisions of this Agreement, on the date
and at the time to be specified in the  Certificate of Merger to be filed on the
date of the  Closing  with  the  Secretary  of State  of the  State of  Delaware
pursuant to the GCL and in the Articles of Merger to be filed on the date of the
Closing with the Secretary of State of the Commonwealth of Pennsylvania pursuant
to the BCL (the "Effective Time"), Newco will be merged with and into PAHC.

     1.2. Effect of First Merger. At the Effective Time:

          (a) Newco and PAHC (the "First Merger Constituent Corporations") shall
be  merged  into a single  corporation,  which  shall be  PAHC.  PAHC is  hereby
designated as the surviving  corporation  in the First Merger and is hereinafter
sometimes called the "First Merger Surviving Corporation."

          (b) The separate existence of Newco shall cease.


<PAGE>


          (c) The First Merger Surviving  Corporation shall have all the rights,
privileges,  immunities,  and powers and shall  assume and be subject to all the
duties and liabilities of a corporation organized under the BCL.

          (d)  The  First  Merger  Surviving  Corporation  shall  thereupon  and
thereafter possess all of the rights, privileges, immunities, and franchises, of
a public as well as of a private nature, of each of the First Merger Constituent
Corporations;  and all property,  real, personal and mixed, and all debts due on
whatever  account,  including  subscriptions  for shares and all other choses in
action,  and all and every other  interest of and belonging to or due to each of
the  First  Merger  Constituent  Corporations  shall be taken  and  deemed to be
transferred  to and vested in the First  Merger  Surviving  Corporation  without
further action,  act or deed; and the title to any real estate,  or any interest
therein, vested in either of the First Merger Constituent Corporations shall not
revert or be in any way impaired by reason of the First Merger.

          (e) The  First  Merger  Surviving  Corporation  shall  thenceforth  be
responsible  and liable for all the  liabilities  and obligations of each of the
First  Merger  Constituent  Corporations;  and any claim  existing  or action or
proceeding  pending  by or  against  either  of  the  First  Merger  Constituent
Corporations  may be prosecuted to judgment as if the First Merger had not taken
place, or the First Merger  Surviving  Corporation  may be proceeded  against or
substituted  in its place.  The First  Merger  Surviving  Corporation  expressly
assumes  and  agrees to  perform  all of Newco's  liabilities  and  obligations.
Neither the rights of creditors nor any liens upon the property of either of the
First Merger Constituent Corporations shall be impaired by the First Merger.

          (f)  Any  taxes,  penalties,  and  public  accounts  of the  State  of
Delaware,  claimed against either of the First Merger  Constituent  Corporations
but not  settled,  assessed,  or  determined  prior to the First Merger shall be
settled,  assessed, or determined against the First Merger Surviving Corporation
and, together with interest thereon,  shall be a lien against the franchises and
property, both real and personal, of the First Merger Surviving Corporation.

          (g) The Certificate of Incorporation of PAHC as it exists  immediately
prior to the Effective  Time shall be the  Certificate of  Incorporation  of the
First Merger Surviving  Corporation until later amended pursuant to Pennsylvania
law.

          (h)  The  By-Laws  of  PAHC as they  exist  immediately  prior  to the
Effective  Time shall be the By-Laws of the First Merger  Surviving  Corporation
until later amended pursuant to Pennsylvania law.

          (i) The authorized shares of capital stock of PAHC as of the Effective
Time  shall be  25,000,000  shares of Common  Stock,  $1.00 par value (the "PAHC
Common Stock").

          (j)  Subject  to the  terms,  conditions,  and  limitations  set forth
herein,  at the Effective Time and until  surrendered  for exchange and payment,
each  outstanding  stock  certificate   which,  prior  to  the  Effective  Time,
represented  shares of the common  stock,  $1.00 par  value,  of PAHC (the "PAHC
Common  Stock"),  other than any shares of PAHC Common Stock held by NBTB (other
than in a  fiduciary,  representative,  or custodial  capacity),  which shall be
canceled without any payment therefor,  except for any dividends  declared prior
to the Effective Time but not yet paid as of the Effective  Time, and other than
shares of PAHC Common  Stock held by PAHC,  which shall be canceled  without any
payment  therefor,  shall, by virtue of this Agreement and without any action on
the part of the  holder or holders  thereof,  cease to  represent  an issued and
existing  share and shall be converted  into a right to receive  from NBTB,  and
shall for all purposes  represent  the right to receive,  upon  surrender of the
certificate  formerly  representing such shares, a certificate  representing the
number  of  shares  of  NBTB  Common  Stock  specified  in  section  1.5 of this
Agreement;  provided  that,  with  respect  to any  matters  relating  to  stock
certificates representing PAHC Common Stock, NBTB may rely conclusively upon the
record of stockholders maintained by PAHC contain ing the names and addresses of
the holders of record of PAHC's Common Stock at the Effective Time.

                                      - 2 -

<PAGE>


          (k) All shares of capital stock of Newco  outstanding at the Effective
Time shall be converted into and exchanged for 100 shares of common stock of the
First Merger  Surviving  Corporation,  and any shares of capital  stock of Newco
held in the treasury of Newco shall be canceled.

     1.3.  Second Merger.  Subject to the provisions of this  Agreement,  on the
date of the Effective Time, and at such time subsequent to the Effective Time on
such date as shall be designated by NBTB, which date and time shall be specified
in the  Certificate  of Merger to be filed on the date of the  Closing  with the
Secretary  of State  of the  State of  Delaware  pursuant  to the GCL and in the
Articles of Merger to be filed on the date of the Closing with the  Secretary of
State of the  Commonwealth  of  Pennsylvania  pursuant  to the BCL (the  "Second
Merger Effective Time"), PAHC will be merged with and into NBTB.

     1.4. Effect of Second Merger. At the Second Merger Effective Time:

          (a) PAHC and NBTB (the "Second Merger Constituent Corporations") shall
be  merged  into a single  corporation,  which  shall be  NBTB.  NBTB is  hereby
designated as the surviving  corporation in the Second Merger and is hereinafter
sometimes called the "Second Merger Surviving Corporation."

          (b) The separate existence of PAHC shall cease.

          (c) The Second Merger Surviving Corporation shall have all the rights,
privileges,  immuni ties,  and powers and shall assume and be subject to all the
duties and liabilities of a corporation organized under the GCL.

          (d) The  Second  Merger  Surviving  Corporation  shall  thereupon  and
thereafter possess all of the rights, privileges, immunities, and franchises, of
a  public  as  well  as of a  private  nature,  of  each  of the  Second  Merger
Constituent  Corporations;  and all property,  real, personal and mixed, and all
debts due on whatever account,  including subscriptions for shares and all other
choses in action, and all and every other interest of and belonging to or due to
each of the Second Merger Constituent  Corporations shall be taken and deemed to
be transferred to and vested in the Second Merger Surviving  Corporation without
further action,  act or deed; and the title to any real estate,  or any interest
therein,  vested in either of the Second Merger  Constituent  Corporations shall
not revert or be in any way impaired by reason of the Second Merger.

          (e) The Second  Merger  Surviving  Corporation  shall  thenceforth  be
responsible  and liable for all the  liabilities  and obligations of each of the
Second  Merger  Constituent  Corporations;  and any claim  existing or action or
proceeding  pending  by or  against  either  of the  Second  Merger  Constituent
Corporations may be prosecuted to judgment as if the Second Merger had not taken
place, or the Second Merger  Surviving  Corporation may be proceeded  against or
substituted  in its place.  The Second Merger  Surviving  Corporation  expressly
assumes and agrees to perform all of PAHC's liabilities and obligations. Neither
the rights of creditors  nor any liens upon the property of either of the Second
Merger Constituent Corporations shall be impaired by the Second Merger.

          (f) Any taxes,  penalties,  and public accounts of the Commonwealth of
Pennsylvania,   claimed   against  either  of  the  Second  Merger   Constituent
Corporations but not settled, assessed, or determined prior to the Second Merger
shall be settled,  assessed,  or determined  against the Second Merger Surviving
Corporation  and,  together with interest  thereon,  shall be a lien against the
franchises and property,  both real and personal, of the Second Merger Surviving
Corporation.

          (g) The Certificate of Incorporation of NBTB as it exists  immediately
prior  to  the  Second  Merger  Effective  Time  shall  be  the  Certificate  of
Incorporation  of the Second Merger  Surviving  Corporation  until later amended
pursuant to Delaware law.

                                      - 3 -

<PAGE>


          (h) The By-Laws of NBTB as they exist  immediately prior to the Second
Merger  Effective  Time  shall be the  By-Laws of the  Second  Merger  Surviving
Corporation until later amended pursuant to Delaware law.

          (i) The  authorized  shares of capital  stock of NBTB as of the Second
Merger Effective Time shall be that number of shares of preferred stock as exist
immediately  prior to the Second Merger  Effective  Date, with a par value or no
par value and, if applicable,  a stated value as exist  immediately prior to the
Second Merger Effective Date, and that number of shares of common stock as exist
immediately  prior to the Second Merger  Effective  Date, with a par value or no
par value and, if applicable,  a stated value as exist  immediately prior to the
Second Merger Effective Date (the "NBTB Common Stock").

          (j) At the Second Merger  Effective Time, all the shares of PAHC shall
be canceled and only the shares of the Second Merger Surviving Corporation shall
remain as validly  issued  shares of the Second  Merger  Surviving  Corporation,
fully paid and nonassessable.

     1.5. Consideration for First Merger. Subject to the terms, conditions,  and
limitations  set forth herein  (including  the  procedures  specified in section
11.2(d)(ii) of this Agreement),  as a result of the First Merger,  each share of
PAHC Common  Stock  other than  shares of PAHC Common  Stock held by NBTB (other
than in a fiduciary,  representative, or custodial capacity) or by PAHC shall be
converted  into the right to receive,  in exchange for each share of PAHC Common
Stock held of record as of the Effective Time, 1.805 shares of NBTB Common Stock
(the "Exchange Ratio").

     1.6. No Fractional  Shares.  NBTB will not issue  fractional  shares of its
stock.  In  lieu of  fractional  shares  of  NBTB  Common  Stock,  if any,  each
shareholder  of PAHC who is entitled to a fractional  share of NBTB Common Stock
shall receive an amount of cash equal to the product of such fraction  times the
average of the closing bid price and the closing  asked price per share for NBTB
Common  Stock as  reported  on the Nasdaq  National  Market  (or, in the absence
thereof,  as reported by or  determined  by  reference to such other source upon
which NBTB and PAHC shall agree) for each of the twenty consecutive trading days
ending on and  including the eighth  trading day before the Effective  Time (the
"Average Closing  Price").  Such fractional share interest shall not include the
right to vote or to receive dividends or any interest thereon.

     1.7.  Dividends;  Interest.  No  shareholder  of PAHC will be  entitled  to
receive  dividends  on his,  her or its NBTB  Common  Stock  until he, she or it
exchanges his, her or its certificates  representing  PAHC Common Stock for NBTB
Common Stock.  Any dividends  declared on NBTB Common Stock to holders of record
on or after the  Effective  Time shall,  with  respect to stock to be  delivered
pursuant to this Agreement to  shareholders of PAHC who have not exchanged their
certificates  representing  PAHC Common Stock for NBTB Common Stock,  be paid to
the Exchange  Agent (as designated in section 1.8 of this  Agreement)  and, upon
receipt from a former shareholder of PAHC of certificates representing shares of
PAHC Common Stock,  the Exchange Agent shall forward to such former  shareholder
of PAHC (i)  certificates  representing  his,  her or its shares of NBTB  Common
Stock, (ii) dividends declared thereon subsequent to the Effective Time (without
interest)  and (iii)  the cash  value of any  fractional  shares  determined  in
accordance with section 1.6 hereof.

     1.8. Designation of Exchange Agent.

          (a) The parties to this  Agreement  hereby  designate  American  Stock
Transfer and Trust  Company,  New York,  New York  ("AST") as Exchange  Agent to
effect the exchanges contemplated hereby.

          (b) NBTB will, promptly after the Effective Time, issue and deliver to
AST the share  certifi  cates  representing  shares of NBTB Common Stock (each a
"New  Certificate")  and the cash to be paid to holders of PAHC Common  Stock in
accordance with this Agreement.

                                      - 4 -

<PAGE>


          (c) If any New  Certificate  is to be issued in a name other than that
in which  the  certificate  formerly  representing  PAHC  Common  Stock (an "Old
Certificate")  and surrendered  for exchange was issued,  the Old Certificate so
surrendered shall be properly endorsed and otherwise in proper form for transfer
and the person  requesting  such exchange shall pay to AST any transfer or other
taxes  required  by reason of the  issuance of the New  Certificate  in any name
other than that of the registered holder of the Old Certificate surrendered,  or
establish  to the  satisfaction  of AST that  such  tax has been  paid or is not
payable.

          (d) In the event that any Old  Certificates  have not been surrendered
for  exchange  in  accordance  with  this  Agreement  on or  before  the  second
anniversary  of the Effective  Time,  NBTB may at any time  thereafter,  with or
without notice to the holders of record of such Old  Certificates,  sell for the
accounts  of any or all of such  holders any or all of the shares of NBTB Common
Stock which such holders are entitled to receive  under  Section 1.5 hereof (the
"Unclaimed Shares"). Any such sale may be made by public or private sale or sale
at any broker's board or on any  securities  exchange in such manner and at such
times as NBTB shall  determine.  If, in the opinion of counsel  for NBTB,  it is
necessary or desirable,  any Unclaimed  Shares may be registered  for sale under
the  Securities  Act of 1933, as amended (the  "Securities  Act") and applicable
state laws. NBTB shall not be obligated to make any sale of Unclaimed  Shares if
it shall determine not to do so, even if notice of sale of the Unclaimed  Shares
has been given.  The net proceeds of any such sale of Unclaimed  Shares shall be
held for holders of the  unsurrendered  Old Certificates  whose Unclaimed Shares
have been sold, to be paid to them upon surrender of the Old Certificates.  From
and after any such sale, the sole right of the holders of the  unsurrendered Old
Certificates whose Unclaimed Shares have been sold shall be the right to collect
the net sale  proceeds  held by NBTB for  their  respective  accounts,  and such
holders  shall not be entitled to receive any interest on such net sale proceeds
held by NBTB.

          (e) If any Old Certificates  are not surrendered  prior to the date on
which such  certificates or the proceeds of the sale of the Unclaimed Shares, as
the case may be,  would  otherwise  escheat  to or become  the  property  of any
governmental unit or agency,  the unclaimed items shall, to the extent permitted
by abandoned  property and any other applicable law, become the property of NBTB
(and to the extent  not in its  possession  shall be paid over to it),  free and
clear of all  claims or  interest  of any  person  previously  entitled  to such
claims.  Notwithstanding the foregoing, neither NBTB nor its agents or any other
person  shall be  liable  to any  former  holder  of PAHC  Common  Stock for any
property  delivered  to a  public  official  pursuant  to  applicable  abandoned
property, escheat or similar laws.

     1.9. Notice of Exchange.  Promptly after the Effective Time, AST shall mail
to each holder of one or more  certificates  formerly  representing  PAHC Common
Stock a notice  specifying  the  Effective  Time and  notifying  such  holder to
surrender his, her or its certificate or certificates to AST for exchange.  Such
notice  shall be mailed to  holders by regular  mail at their  addresses  on the
records of PAHC.

     1.10. Acts to Carry Out This Merger Plan.

          (a) PAHC and its proper  officers and directors shall do all such acts
and things as may be  necessary or proper to vest,  perfect,  or confirm in NBTB
title to such property or rights as are specified in sections  1.4(c) and 1.4(d)
of this Agreement and otherwise to carry out the purposes of this Agreement.

          (b) If, at any time after the Effective  Time,  NBTB shall consider or
be advised that any further  assignments  or assurances in law or any other acts
are  necessary  or  desirable  to (i) vest,  perfect,  or confirm,  of record or
otherwise,  in NBTB its right, title, or interest in or under any of the rights,
properties, or assets of PAHC acquired or to be acquired by NBTB as a result of,
or in connection  with, the Merger,  or (ii) otherwise carry out the purposes of
this  Agreement,  PAHC and its proper  officers and directors shall be deemed to
have granted to NBTB an irrevocable power of attorney to execute and deliver all
such  proper  deeds,  assignments,  and  assurances  in law  and to do all  acts
necessary or proper to vest, perfect, or confirm title to and possession of such
rights, properties, or

                                      - 5 -

<PAGE>


assets in NBTB and  otherwise to carry out the purposes of this  Agreement;  and
the proper  officers and  directors of NBTB are fully  authorized in the name of
PAHC or otherwise to take any and all such action.

     1.11.  Treatment of Stock Options. At the Effective Time, each stock option
to purchase PAHC Common Stock not exercised prior to the Effective Time (each, a
"Converted  Option"),   whether  vested  or  unvested,  shall  automatically  be
converted into an option (a "Replacement  Option") to acquire, on the same terms
and conditions as were applicable  under the terms of such Converted  Option and
any option plan under which such Converted Option was issued (or as near thereto
as is  practicable),  a number of shares of NBTB Common  Stock equal to (rounded
down to the  nearest  whole  number of shares)  (a) the number of shares of PAHC
Common  Stock  subject  to  such  Converted  Option  as of  the  Effective  Time
multiplied by (b) the Exchange  Ratio,  at an exercise  price per share (rounded
down to the nearest whole cent) equal to (x) the aggregate  exercise price under
such Converted Option for all of the shares of PAHC Common Stock subject to such
Converted  Option at the  Effective  Time divided by (y) the number of shares of
NBTB  Common  Stock  subject to such  Replacement  Option.  Notwithstanding  the
foregoing, in the case of each Converted Option to which section 421 of the Code
applies by reason of its qualification  under section 422 of the Code, the terms
of the  Replacement  Option  into  which  such  Converted  Option is  converted,
including  the  option  price,  the  number  of  shares  of  NBTB  Common  Stock
purchasable pursuant to such option, and the terms and conditions of exercise of
such option shall be determined so as to comply with section 424(a) of the Code.
At or prior to the Effective Time, PAHC shall take all action, if any, necessary
with  respect to any  Converted  Options or stock plans  under  which  Converted
Options have been issued to permit the replacement of the Converted Options with
Replacement Options as contemplated by this section 1.11. At the Effective Time,
NBTB shall assume such stock plans; provided, that such assumption shall only be
in respect of the  Replacement  Options  and that NBTB shall have no  obligation
with respect to any awards under such plans other than the  Replacement  Options
and shall have no obligation to make any additional  grants or awards under such
assumed plans.

     1.12. Stock Option Agreement.  Simultaneously herewith, NBTB and PAHC shall
execute and deliver the Stock Option  Agreement in the form  attached  hereto as
Exhibit I. The option that is the  subject of the Stock  Option  Agreement  will
terminate as of, and will not be exercisable following, the Effective Time.

     1.13. Executive Officers and Directors of PAHC.

          (a) At the Effective Time, in  consideration  for and against delivery
of a full and unconditional  release granted in favor of NBTB, PAHC, and Pioneer
American Bank,  National  Association ("PA Bank") by John W. Reuther ("Reuther")
from any and all claims,  actions,  or  liabilities  which Reuther may have, may
have had, or could have against  NBTB,  PAHC,  or PA Bank  (except  entitlements
granted to Reuther by this  Agreement or the employment  agreement  described in
section 4.8 hereof (the "Reuther Employment Agreement") or granted to Reuther by
the  Executive  Retirement  Plan of PA Bank  adopted on October  25, 1988 or the
Split Dollar Agreement/Key  Executive Equity Program dated February 15, 1994, as
restated  April 16,  1999),  and  subject in every case to section  18(k) of the
Federal  Deposit  Insurance  Act (12 U.S.C.  ss.  1828(k)),  NBTB will tender to
Reuther the Reuther  Employment  Agreement and the  change-in-control  agreement
described in section 5.5 hereof.

          (b) At the Effective Time, in  consideration  for and against delivery
of a full and unconditional  release granted in favor of NBTB, PAHC, and PA Bank
by Patricia A. Cobb ("Cobb") from any and all claims,  actions,  or  liabilities
which Cobb may have, may have had, or could have against NBTB,  PAHC, or PA Bank
(except  entitlements  granted to Cobb by this Agreement),  and subject in every
case to section  18(k) of the  Federal  Deposit  Insurance  Act (12  U.S.C.  ss.
1828(k)), NBTB will tender to Cobb the change-in-control  agreement described in
section 5.5 hereof.

          (c) At the Effective Time, in  consideration  for and against delivery
of a full and unconditional  release granted in favor of NBTB, PAHC, and PA Bank
by James E. Jackson ("Jackson") from any and all claims, actions, or liabilities
which Jackson may have, may have had, or could have against NBTB, PAHC, or

                                      - 6 -

<PAGE>


PA Bank (except entitlements granted to Jackson by this Agreement),  and subject
in every case to section 18(k) of the Federal  Deposit  Insurance Act (12 U.S.C.
ss.  1828(k)),  NBTB will  tender to  Jackson  the  change-in-control  agreement
described in section 5.5 hereof.

          (d) From and after the Effective  Time, the Board of Directors of NBTB
shall consist of the directors of NBTB  immediately  prior to the Effective Time
(each as a director of the class of which he was a member  immediately  prior to
the Effective Time) and the following three  individuals each of whom shall hold
office until the next election of the class to which he is hereby designated and
until his  successor  shall be elected  and  qualified:  Joseph G.  Nasser (as a
director  of the class whose term  expires in 2003),  Richard  Chojnowski  (as a
director of the class whose term expires in 2002),  and Gene E. Goldenziel (as a
director of the class whose term expires in 2001).

     1.14. Employee Benefits.

          (a) If any employee of PAHC or of PA Bank becomes a participant in any
employment  benefit  plan,  practice,  or policy  of NBTB or NBT Bank,  National
Association  ("NBT Bank"),  such employee shall be given credit under such plan,
practice,  or policy for all service prior to the Effective Time with PAHC or PA
Bank for  purposes of  eligibility  and  vesting,  but not for  benefit  accrual
purposes,  for which such service is taken into account or  recognized,  and, if
necessary,  NBTB shall cause any and all pre-existing  condition limitations and
eligibility  waiting  periods under group health plans to be waived with respect
to such  participants and their eligible  dependents  (except to the extent such
pre-existing condition limitations are no more onerous than similar limitations,
or such waiting  periods do not extend any waiting  period,  applicable  to such
employee  under  the  plans  of PAHC or PA  Bank),  provided  that  there  be no
duplication of such benefits as are provided  under any employee  benefit plans,
practices,  or policies of PAHC or PA Bank that continue in effect following the
Effective Time.

          (b)  Each  employee  of PAHC or PA Bank  (except  Reuther,  Cobb,  and
Jackson)  who  becomes an employee  of NBTB or any of its  subsidiaries  or who,
following the Effective  Time,  remains an employee of PA Bank and is terminated
by  NBTB  or any of its  subsidiaries  (including  PA  Bank)  subsequent  to the
Effective  Time shall be entitled to severance  pay, if any, in accordance  with
the general  severance  policy of NBTB. Such employee's  service with PAHC or PA
Bank shall be  treated as service  with NBTB for  purposes  of  determining  the
amount of severance pay, if any, under the severance policy of NBTB.

     1.15. Voting Agreements.  Simultaneously herewith, each shareholder of PAHC
who is  listed on  Schedule  1.15  attached  hereto  shall  each  enter  into an
agreement  with NBTB,  substantially  in form and substance as that set forth as
Exhibit II attached hereto, in which he or she agrees to vote all shares of PAHC
Common Stock which may be voted,  or whose vote may be directed,  by him or her,
in favor of the  transactions  contemplated  by this Agreement at the meeting of
shareholders at which such transactions shall be considered.

     1.16.  Optional  Bank  Merger  Transaction.  NBTB in its sole and  absolute
discretion  may  elect  to  cause  a  merger  of PA Bank  to be  consummated  in
accordance with the following terms and conditions:

          (a) At any time  following the date of this  Agreement,  and until and
including  February 5, 2000,  NBTB shall be entitled to give notice to PAHC that
NBTB wishes on the date of the Effective  Time,  and at such time  subsequent to
the  Effective  Time on such date as shall be  designated by NBTB, to consummate
the merger of PA Bank with and into LA Bank,  National  Association ("LA Bank"),
or the  merger of LA Bank  into PA Bank,  as the case may be  specified  in such
notice (in either case, the "Bank Merger"). The day on which NBTB gives any such
notice is referred to herein as the "Bank Merger Notice Date."

                                      - 7 -

<PAGE>


          (b) Following the Bank Merger Notice Date, NBTB shall use commercially
reasonable efforts to cause LA Bank to promptly enter into, and PAHC shall cause
PA Bank to promptly enter into, an agreement of merger substantially in form and
substance as that set forth as Exhibit III attached hereto.

          (c)  Following the Bank Merger Notice Date and at the request of NBTB,
PAHC shall cause PA Bank to  promptly  become a party to this  Agreement  and to
join in such representations,  warranties,  covenants, and agreements to or with
NBTB as  PAHC  has,  with  respect  to PA  Bank,  made  to or with  NBTB in this
Agreement.

          (d) Following the Bank Merger Notice Date, NBTB shall use commercially
reasonable  efforts to cause LA Bank to promptly  seek to obtain the approval of
the  Office of the  Comptroller  of the  Currency  (the  "OCC")  and such  other
approvals,  if any,  as LA Bank may  require  for the  consummation  of the Bank
Merger,  and PAHC shall cause PA Bank to promptly seek to obtain such approvals,
if any, as PA Bank may require for the consummation of the Bank Merger.

          (e) Anything in this  Agreement to the contrary  notwithstanding,  the
Bank Merger shall not occur unless, at the time of the Bank Merger, LA Bank is a
direct or indirect subsidiary of NBTB.

     2. EFFECTIVE TIME.

     The Effective  Time shall be the date and time specified in the articles of
merger  to be  filed  with  the  Secretary  of  State  of  the  Commonwealth  of
Pennsylvania pursuant to section 1927 of the BCL to effectuate the First Merger,
the date of which shall be the latest of:

     2.1. PAHC Shareholder Approval. The day upon which the shareholders of PAHC
approve,  ratify,  and confirm the Merger by the affirmative vote of the holders
of at least 70 percent of the votes which all  shareholders of PAHC are entitled
to cast thereon;

     2.2. NBTB Shareholder Approval. The day upon which the shareholders of NBTB
approve the issuance of NBTB Common Stock  pursuant to this Agreement and ratify
this Agreement;

     2.3.  Federal Reserve  Approval.  The first to occur of (a) the date thirty
days  following  the date of the order of the Board of  Governors of the Federal
Reserve  System or the  Federal  Reserve  Bank of New York  acting  pursuant  to
authority  delegated  to it by the Board of  Governors  of the  Federal  Reserve
System (collectively, the "Board of Governors") approving the Merger, or (b) if,
pursuant to section 321(a) of the Riegle  Community  Development  and Regulatory
Improvement  Act of 1994 (the "Riegle Act"),  the Board of Governors  shall have
prescribed a shorter period of time with the concurrence of the Attorney General
of the  United  States,  the date on which  such  shorter  period of time  shall
elapse,  or (c) the date  ten days  following  the  date on which  the  Board of
Governors indicates its waiver of jurisdiction over the Merger; or

     2.4.  OCC  Approval.  If the Bank  Merger  Notice  Date shall  have  timely
occurred,  the first to occur of (a) the date thirty days  following the date of
the order of the OCC approving the Bank Merger,  or (b) if,  pursuant to section
321(b) of the Riegle Act, the OCC shall have prescribed a shorter period of time
with the concurrence of the Attorney  General of the United States,  the date on
which such shorter period of time shall elapse; or

     2.5.  Pennsylvania  Department  of  Banking  Approval.  The  date  ten days
following the date of the order of the Department of Banking of the Commonwealth
of Pennsylvania (the  "Department")  approving the transactions  contemplated by
this Agreement;

     2.6.  Other  Regulatory  Approvals.  The date upon which any other material
order,  approval,  or  consent  of a federal  or state  regulator  of  financial
institutions or financial institution holding companies authorizing

                                      - 8 -

<PAGE>


consummation of the  transactions  contemplated by this Agreement is obtained or
any waiting period mandated by such order, approval, or consent has run;

     2.7.  Expiration of Stays.  Ten days after any stay of the approvals of any
of the Board of Governors or the Department of the transactions  contemplated by
this Agreement or any injunction against closing of said transactions is lifted,
discharged, or dismissed; or

     2.8.  Mutual  Agreement.  Such other date as shall be mutually agreed to by
NBTB and PAHC.


3.   CONDITIONS PRECEDENT TO PERFORMANCE OF OBLIGATIONS OF THE PARTIES.

     The  obligations of NBTB and PAHC to consummate the Merger shall be subject
to the conditions that on or before the Effective Time:

     3.1.  Regulatory  Approvals.  Orders,  consents,  and approvals required to
consummate  the Merger  and,  if the Bank  Merger  Notice Date shall have timely
occurred,  the Bank Merger shall have been entered by the requisite governmental
authorities,  and all statutory  waiting  periods in respect  thereof shall have
expired.

     3.2. Registration Statement.

          (a) Effectiveness. The registration statement to be filed by NBTB with
the Securities and Exchange  Commission  (the "SEC")  pursuant to the Securities
Act in connection with the registration of the shares of NBTB Common Stock to be
used  as  consideration  in  connection  with  the  Merger  (the   "Registration
Statement") shall have become effective under the Securities Act, and NBTB shall
have received all required state securities laws or "blue sky" permits and other
required  authorizations or confirmations of the availability of exemptions from
registration requirements necessary to issue NBTB Common Stock in the Merger.

          (b) Absence of Stop-Order.  Neither the Registration Statement nor any
such  required  permit,  authorization,  or  confirmation  shall be subject to a
stop-order  or  threatened  stop-order  by  the  SEC  or  any  state  securities
authority.

     3.3.  Approval by Shareholders of PAHC. The shareholders of PAHC shall have
authorized,  ratified,  and confirmed the Merger by the affirmative  vote of the
holders of at least 70 percent of the votes which all  shareholders  of PAHC are
entitled to cast thereon.

     3.4. Approval by Shareholders of NBTB.

          (a) The  shareholders of NBTB shall have approved the issuance of NBTB
Common Stock pursuant to this Agreement and ratified this Agreement.

          (b) The shareholders of NBTB shall have approved a proposed  amendment
to NBTB's  Certificate  of  Incorporation  to increase the number of  authorized
shares of NBTB common stock from fifteen  million to thirty  million (the "Share
Increase Amendment").

     3.5. Federal Income  Taxation.  NBTB and PAHC shall have received a written
opinion of Blank Rome  Comisky & McCauley  LLP, or of Duane,  Morris & Heckscher
LLP, or of another firm mutually  agreeable to NBTB and PAHC,  applying existing
law, that the Merger shall qualify as one or more reorganizations  under section
368(a)(1) of the Code and the regulations and rulings promulgated thereunder. In
rendering such opinion, the firm

                                      - 9 -

<PAGE>


rendering  the opinion may require and rely upon  representations  contained  in
certificates of officers of NBTB, PAHC, and others.

     3.6.  Adverse  Legislation.  Subsequent to the date of this  Agreement,  no
legislation  shall have been  enacted and no  regulation  or other  governmental
requirement  shall  have been  adopted or imposed  that  renders or will  render
consummation of the Merger impossible or illegal.

     3.7. Absence of Litigation.  No action, suit, or proceeding shall have been
instituted or shall have been threatened before any court or other  governmental
body or by any public authority to restrain,  enjoin, or prohibit the Merger, or
which would  reasonably be expected to restrict  materially the operation of the
business of NBTB, that of PAHC, or that of PA Bank or the exercise of any rights
with respect  thereto or to subject either of the parties hereto or any of their
subsidiaries,  directors,  or  officers  to  any  liability,  fine,  forfeiture,
divestiture, or penalty on the ground that the transactions contemplated hereby,
the parties hereto, or their subsidiaries,  directors, or officers have breached
or  will  breach  any  applicable  law or  regulation  or have  otherwise  acted
improperly  in connection  with the  transactions  contemplated  hereby and with
respect to which the parties  hereto have been advised by counsel  that,  in the
opinion of such counsel,  such action,  suit, or proceeding  raises  substantial
questions of law or fact which could reasonably be decided materially  adversely
to either party hereto or its subsidiaries, directors, or officers.

4.   CONDITIONS PRECEDENT TO PERFORMANCE OF THE OBLIGATIONS OF NBTB.

     The  obligations of NBTB hereunder are subject to the  satisfaction,  on or
prior to the Effective  Time, of all the following  conditions,  compliance with
which or the  occurrence  of which  may be waived in whole or in part by NBTB in
writing unless not so permitted by law:

     4.1.  Representations  and  Warranties;  Performance  of  Obligations.  All
representations and warranties of PAHC contained in this Agreement shall be true
and  correct in all  material  respects as of the  Effective  Time with the same
effect as if such  representations  and warranties had been made or given at and
as of such date, except that representations and warranties of PAHC contained in
this Agreement  which  specifically  relate to an earlier date shall be true and
correct in all material  respects as of such earlier  date.  All  covenants  and
obligations  to be  performed or met by PAHC on or prior to the  Effective  Time
shall have been so  performed  or met. On the date of the  Effective  Time,  the
president and chief executive  officer and the chief  financial  officer of PAHC
shall  deliver  to NBTB a  certificate  to that  effect.  The  delivery  of such
certificates   shall  in  no  way  diminish  the  warranties,   representations,
covenants, and obligations of PAHC made in this Agreement.

     4.2.  Opinion of PAHC  Counsel.  NBTB shall have  received  (a) a favorable
opinion from Blank Rome Comisky & McCauley LLP,  dated the date of the Effective
Time,  substantially  in form and  substance as that set forth as Exhibit  IV(a)
attached hereto, and (b) a favorable opinion from Patricia A. Cobb, Esq., Senior
Executive  Vice  President/In-House  Counsel  of  PAHC,  dated  the  date of the
Effective Time, substantially in form and substance as that set forth in Exhibit
IV(b) attached hereto.

     4.3.  Opinion  of PAHC  Litigation  Counsel.  NBTB  shall  have  received a
favorable opinion from legal counsel handling litigation matters for PAHC and PA
Bank, dated the date of the Effective Time,  substantially in form and substance
as that set forth as Exhibit V attached hereto.

     4.4. No Adverse Developments.

          (a) During the period from  September 30, 1999 to the Effective  Time,
(i) there shall not have been any material  adverse effect as defined in section
12.7(d) (a "Material Adverse Effect") with respect to PAHC; and (ii) none of the
events  described in clauses (a) through (f) of section  6.16 of this  Agreement
shall have occurred,

                                     - 10 -

<PAGE>


and each of the practices and conditions described in clauses (x) through (z) of
that section shall have been maintained.

          (b) As of the Effective  Time,  the capital  structure of PAHC and the
capital structure of PA Bank shall be as stated in section 6.9.

          (c) As of the Effective Time, other than  liabilities  incurred in the
ordinary course of business  subsequent to September 30, 1999, there shall be no
liabilities  of PAHC or PA Bank  which are  material  to PAHC on a  consolidated
basis which were not  reflected  on the  consolidated  statement of condition of
PAHC as of  September  30,  1999 or in the  related  notes  to the  consolidated
statement of condition of PAHC as of September 30, 1999.

          (d) No adverse action shall have been instituted or threatened against
PAHC or any of its subsidiaries by any governmental  authority, or referred by a
governmental authority to another governmental authority, for the enforcement or
assessment of penalties for the violation of any laws of regulations relating to
equal credit opportunity, fair housing, or fair lending.

          (e) NBTB  shall  have  received  a  certificate  dated the date of the
Effective Time, signed by the president and the chief financial officer of PAHC,
certifying to the matters set forth in paragraphs (a), (b), (c), and (d) of this
section 4.4. The delivery of such officers' certificate shall in no way diminish
the warranties and representations of PAHC made in this Agreement.

     4.5.  Consolidated  Net  Worth.  On  and  as of  the  Effective  Time,  the
consolidated  net  worth of PAHC as  determined  in  accordance  with  generally
accepted  accounting  principles  but without regard to the change in unrealized
gains and  losses on  securities  (net of  reclassification  adjustment  and tax
effects)  between  September 30, 1999 and the Effective Time,  shall not be less
than  the sum of (a)  $31,906,000,  (b)  the  proceeds  to  PAHC of the  sale of
treasury  stock since  September  30, 1999,  and (c) the proceeds to PAHC of the
exercise  of stock  options  to  purchase  shares  of PAHC  Common  Stock  since
September 30, 1999.

     4.6. Loan Loss  Reserve.  On and as of the  Effective  Time,  the aggregate
reserve for loan losses of PA Bank as determined in  accordance  with  generally
accepted accounting principles shall not be less than $3,000,000.

     4.7.  CRA  Rating.  The  CRA  rating  of PA Bank  shall  be no  lower  than
"satisfactory."

     4.8.  Employment  Agreement.  Reuther shall have entered into an employment
agreement  with NBTB  substantially  in form and  substance as that set forth as
Exhibit VI attached hereto.

     4.9.  Releases.  The releases  described in sections 1.13(a),  (b), and (c)
shall have been delivered to NBTB.

     4.10. Accounting Treatment.  NBTB shall have received letters (the "Pooling
Letters") from KPMG LLP ("KPMG"),  in its capacity as the  independent  auditing
firm of NBTB,  dated the date of or shortly prior to each of the mailing date of
the proxy  materials to the  shareholders of PAHC, and the date of the Effective
Time,   stating  the  opinion  of  KPMG  that  the  Merger  shall   qualify  for
pooling-of-interest accounting treatment.

     4.11. Affiliates' Agreements.  NBTB shall have received a written agreement
substantially  in form and  substance  as that set forth as Exhibit VII attached
hereto (an "Affiliates Agreement"):

          (a) on or before the date of this Agreement,  from each person who, on
the date of this  Agreement,  is an "affiliate" of PAHC (as that term is used in
section 7.6 of this Agreement), and

                                     - 11 -

<PAGE>


          (b) not  later  than  ten days  after  any  other  person  becomes  an
"affiliate"  of PAHC (as that term is used in  section  7.6 of this  Agreement),
from such person.

     4.12.  Fairness Opinion.  NBTB shall have received a letter from McConnell,
Budd & Downes, Inc. ("MB&D"),  dated the date of or shortly prior to the mailing
date of the proxy materials to the shareholders of NBTB,  stating the opinion of
MB&D that the Exchange  Ratio is fair,  from a financial  point of view,  to the
shareholders of NBTB.

5.   CONDITIONS PRECEDENT TO PERFORMANCE OF OBLIGATIONS OF PAHC.

     The  obligations of PAHC hereunder are subject to the  satisfaction,  on or
prior to the Effective  Time, of all the following  conditions,  compliance with
which or the  occurrence  of which  may be waived in whole or in part by PAHC in
writing unless not so permitted by law:

     5.1.  Representations  and  Warranties;  Performance  of  Obligations.  All
representations and warranties of NBTB contained in this Agreement shall be true
and  correct in all  material  respects as of the  Effective  Time with the same
effect as if such  representations  and warranties had been made or given at and
as of such date, except that representations and warranties of NBTB contained in
this Agreement  which  specifically  relate to an earlier date shall be true and
correct in all material  respects as of such earlier  date.  All  covenants  and
obligations  to be  performed or met by NBTB on or prior to the  Effective  Time
shall have been so performed or met. On the date of the Effective  Time,  either
the  president or an executive  vice  president of NBTB shall  deliver to PAHC a
certificate to that effect. The delivery of such officer's  certificate shall in
no way diminish the warranties,  representations,  covenants, and obligations of
NBTB made in this Agreement.

     5.2. Opinion of NBTB Counsel.  PAHC shall have received a favorable opinion
of  Duane,  Morris  &  Heckscher  LLP,  dated  the date of the  Effective  Time,
substantially  in form and  substance as that set forth as Exhibit VIII attached
hereto.

     5.3. No Adverse Developments.  During the period from September 30, 1999 to
the Effective Time,  there shall not have been any Material  Adverse Effect with
respect to NBTB,  and PAHC shall have received a  certificate  dated the date of
the Effective Time signed by either the President or an Executive Vice President
of NBTB to the  foregoing  effect.  The delivery of such  officer's  certificate
shall in no way diminish the  warranties  and  representa  tions of NBTB made in
this Agreement.

     5.4.  Status of NBTB Common  Stock.  The shares of NBTB Common  Stock to be
issued to the  shareholders  of PAHC upon  consummation of the Merger shall have
been authorized for inclusion on the Nasdaq National Market (or another national
securities exchange) subject to official notice of issuance.

     5.5.  Change-in-Control  Agreements.  NBTB shall have  tendered  to each of
Reuther, Cobb, and Jackson a change-in-control  agreement  substantially in form
and substance as that set forth as Exhibit IX attached hereto.

     5.6. Board of Directors.  Subject to the fiduciary  duties of its directors
to NBTB,  NBTB  shall  have  taken  all  necessary  action  to  comply  with its
obligations under section 1.13(d) of this Agreement.

     5.7.  Fairness  Opinion.  PAHC shall have received a letter from  Danielson
Associates Inc. ("Danielson"), dated the date of or shortly prior to the mailing
date of the proxy materials to the shareholders of PAHC,  stating the opinion of
Danielson  that the Exchange Ratio is fair,  from a financial  point of view, to
the shareholders of PAHC.

                                     - 12 -

<PAGE>


     5.8.  Accounting  Treatment.  NBTB shall have received the Pooling Letters,
provided, however, that if NBTB shall not have received the Pooling Letters as a
result  of the  action  of PAHC or one or  more  of its  affiliates,  directors,
officers,  or  shareholders,  then PAHC shall be deemed to have duly  waived the
condition set forth in this section 5.8.

6.   REPRESENTATIONS AND WARRANTIES OF PAHC.

     PAHC represents and warrants to NBTB as follows:

     6.1. Organization, Powers, and Qualification. Each of PAHC and PA Bank is a
corporation  which is duly  organized,  validly  existing,  and in good standing
under  the  laws of its  jurisdiction  of  incorporation  and has all  requisite
corporate  power and authority to own and operate its properties and assets,  to
lease  properties  used in its  business,  and to carry on its  business  as now
conducted.  Each of PAHC and PA Bank owns or possesses  in the  operation of its
business all  franchises,  licenses,  permits,  branch  certificates,  consents,
approvals,  waivers, and other authorizations,  governmental or otherwise, which
are necessary for it to conduct its business as now conducted,  except for those
where the  failure of such  ownership  or  possession  would not have a Material
Adverse  Effect on PAHC or PA Bank.  Each of PAHC and PA Bank is duly  qualified
and licensed to do business and is in good standing in every  jurisdiction  with
respect to which the failure to be so  qualified  or licensed  could result in a
Material Adverse Effect on PAHC or PA Bank.

     6.2.  Execution and  Performance  of Agreement.  Subject to the approval of
this Agreement by the affirmative  vote of the holders of at least 70 percent of
the votes which all shareholders of PAHC are entitled to cast thereon,  PAHC has
all  requisite  corporate  power and  authority  to  execute  and  deliver  this
Agreement and to perform its respective terms.

     6.3. Absence of Violations.

          (a) Neither  PAHC nor PA Bank is (i) in  violation  of its  respective
charter documents or bylaws, (ii) in violation of any applicable federal, state,
or local law or  ordinance or any order,  rule,  or  regulation  of any federal,
state,  local, or other governmental agency or body, or (iii) in violation of or
in default with respect to any order, writ, injunction,  or decree of any court,
or any order, license, regulation, or demand of any governmental agency, except,
in the case of (ii) or  (iii),  for such  violations  or  defaults  which in the
aggregate could not reasonably be expected to have a Material  Adverse Effect on
PAHC or PA Bank;  and neither  PAHC nor PA Bank has received any claim or notice
of violation with respect thereto;

          (b)  neither  PAHC nor PA Bank nor any  member  of the  management  of
either of them is a party to any assistance  agreement,  supervisory  agreement,
memorandum of understanding,  consent order, cease and desist order or condition
of any regulatory order or decree with or by the Board of Governors, the Federal
Reserve Bank of Philadelphia, the OCC, the Federal Deposit Insurance Corporation
(the "FDIC"), the SEC, the Department, any other banking or securities authority
of the  United  States  or  the  Commonwealth  of  Pennsylvania,  or  any  other
regulatory agency that relates to the conduct of the business of PAHC or PA Bank
or any of their subsidiaries or their assets; and except as previously disclosed
to NBTB in writing, no such agreement,  memorandum,  order, condition, or decree
is pending or threatened;

          (c) PA  Bank  has  established  policies  and  procedures  to  provide
reasonable  assurance of  compliance in a safe and sound manner with the federal
banking,  credit,  housing,  consumer protection,  and civil rights laws and the
regulations  adopted under each of those laws, so that  transactions be executed
and assets be main tained in accordance with such laws and regulations;  and the
policies and practices of PA Bank with respect to all

                                     - 13 -

<PAGE>


such laws and regulations  reasonably limit  noncompliance and detect and report
noncompliance to its management; and

          (d) PA Bank has  established a CRA policy which provides for goals and
objectives  consistent  with  CRA and for  procedures  whereby  all  significant
CRA-related activity is documented;  and PA Bank has officially designated a CRA
officer who reports  directly to the board of directors and is  responsible  for
the CRA program of PA Bank.

     6.4.  Compliance with Agreements.  Neither PAHC nor PA Bank is in violation
of any  term  of any  security  agreement,  mortgage,  indenture,  or any  other
contract,  agreement,   instrument,  lease,  or  certificate,  except  for  such
violations  which in the  aggregate  could not  reasonably be expected to have a
Material Adverse Effect on PAHC or PA Bank.

     6.5. Binding Obligations. Subject to the approval of its shareholders, this
Agreement constitutes valid, legal, and binding obligations of PAHC, enforceable
against it in accordance with its terms, except as enforcement may be limited by
applicable  bankruptcy,  insolvency,  moratorium  or similar  law, or by general
principles of equity. The execution, delivery, and performance of this Agreement
and the transactions  contemplated thereby have been duly and validly authorized
by the board of directors of PAHC.

     6.6. Absence of Default; Due Authorization.

          (a) None of the  execution  or the  delivery  of this  Agreement,  the
consummation of the transactions contemplated thereby, or the compliance with or
fulfillment  of the terms thereof will  conflict  with, or result in a breach of
any of the terms,  conditions,  or provisions  of, or constitute a default under
the  organizational  documents or bylaws of PAHC or PA Bank or any subsidiary of
either of them.  Such  execution,  consummation,  and  fulfillment  will not (i)
conflict with, or result in a breach of the terms, conditions, or provisions of,
or constitute a violation,  conflict,  or default under, or, except as set forth
on Schedule 6.6 hereof, give rise to any right of termina tion, cancellation, or
acceleration with respect to, or result in the creation of any lien,  charge, or
encumbrance upon, any property or assets of PAHC or PA Bank or any subsidiary of
either of them pursuant to any  agreement or  instrument  under which PAHC or PA
Bank or any such  subsidiary  is obligated or by which any of its  properties or
assets may be bound, including without limitation any lease, contract, mortgage,
promissory note, deed of trust, loan, credit arrangement, or other commitment or
arrangement of PAHC or PA Bank or any subsidiary of either of them in respect of
which  it is an  obligor,  except  for  such  conflicts,  breaches,  violations,
defaults, rights of termination, cancellation, or acceleration, or results which
in the aggregate  could not  reasonably  be expected to have a Material  Adverse
Effect  on PAHC or PA Bank;  (ii) if the  Merger  is  approved  by the  Board of
Governors  under the Bank  Holding  Company  Act of 1956,  as amended  (the "BHC
Act"),  or if the Board of Governors  waives its  jurisdiction  over the Holding
Company  Merger,  and if the Bank  Merger  is  approved  by the OCC,  and if the
transactions  contemplated  by this  Agreement  are approved by the  Department,
violate any law,  statute,  rule, or  regulation of any  government or agency to
which PAHC or PA Bank or any  subsidiary  of either of them is subject and which
is material to its  operations;  or (iii)  violate any  judgment,  order,  writ,
injunction,  decree,  or ruling to which  PAHC or PA Bank or any  subsidiary  of
either of them or any of the  properties  or assets of either of them is subject
or bound. None of the execution or delivery of this Agreement,  the consummation
of the transactions  contemplated  hereby, or the compliance with or fulfillment
of the terms  hereof  will  require any  authorization,  consent,  approval,  or
exemption  by any person  which has not been  obtained,  or any notice or filing
which  has not been  given or done,  other  than  approval  of the  transactions
contemplated  by this  Agreement by, notices to, or filings with by the Board of
Governors,  the OCC, the Securities and Exchange  Commission (the "SEC"),  state
securities commissions,  the Department,  the Secretary of State of the State of
Delaware, and the Secretary of State of the Commonwealth of Pennsylvania.

                                     - 14 -

<PAGE>


          (b) Except for approval of this Agreement by the  affirmative  vote of
the holders of at least 70 percent of the votes which all  shareholders  of PAHC
are entitled to cast thereon,  and except for approval of the Bank Merger by the
board of directors and  shareholders of PA Bank, no other corporate  proceedings
on the part of PAHC are necessary to approve or authorize  this  Agreement,  the
Merger,  the  Stock  Option  Agreement,   the  issuance  of  the  stock  options
contemplated by the Stock Option Agreement, the subsequent exercise of the stock
options thereby issued, the Bank Merger, or the other transactions  contemplated
by this  Agreement  and the Stock  Option  Agreement  or the carrying out of the
transactions contemplated hereby or thereby.

          (c) The Board of  Directors  of PAHC has taken  all  necessary  action
under the  articles  of  incorporation  of PAHC to approve  unconditionally  and
irrevocably  the right of NBTB and any  transferee  of NBTB and the right of any
"person" that includes  either NBTB or any such transferee (i) to cast more than
10 percent of the total  votes  entitled to be cast by all holders of the voting
securities of PAHC at any meeting,  and (ii) to have  "holdings"  (as defined in
the  articles  of  incorporation  of PAHC) that  exceed 10 percent of the voting
securities  of PAHC,  whether such votes or holdings are acquired by NBTB in the
First  Merger,  by the issuance of the stock options  contemplated  by the Stock
Option  Agreement,  by the  subsequent  exercise  of the  stock  options  issued
thereby, or otherwise.

          (d) The Board of Directors of PAHC has taken all  necessary  action so
that the  provisions  of sections  2561 et seq.  of the BCL (and any  applicable
provisions  of the  takeover  laws  of  any  other  state)  and  any  comparable
provisions of PAHC's articles of incorporation do not and will not apply to this
Agreement,  the First Merger, the Second Merger, the Stock Option Agreement,  or
the transactions contemplated hereby.

          (e) PAHC has not adopted any shareholder rights plan, "poison pill" or
similar plan, or any other plan which could result in the grant of any rights to
any  person,  or which  could  enable or  require  any  rights to be  exercised,
distributed  or  triggered,  in  the  event  of  the  execution,   delivery,  or
announcement of this Agreement or the Stock Option Agreement, or in the event of
the  consummation  of the Merger or the Bank  Merger or any of the  transactions
contemplated by this Agreement or the Stock Option Agreement.

     6.7. Compliance with BHC Act; Certain Banking Regulatory Matters.

          (a) PAHC is duly  registered  as a bank holding  company under the BHC
Act. All of the activities and  investments of PAHC conform to the  requirements
applicable  generally  to  bank  holding  companies  under  the  BHC Act and the
regulations of the Board of Governors adopted thereunder.

          (b) No corporation or other entity,  other than PAHC, is registered or
is required to be  registered  as a bank  holding  company  under the BHC Act by
virtue  of its  control  over PA  Bank or over  any  company  that  directly  or
indirectly has control over PA Bank.

          (c)  Each of the  activities  engaged  in by PAHC and its  direct  and
indirect  subsidiaries  has  been  determined  by  regulation  of the  Board  of
Governors to be so closely  related to banking or managing or controlling  banks
as to be a proper incident thereto.

          (d) The capital  ratios of each of PAHC and PA Bank comply  fully with
all terms of all currently outstanding  supervisory and regulatory  requirements
and with the conditions of all regulatory orders and decrees.

     6.8. Subsidiaries.

          (a) Other than PA Bank, which is a direct,  wholly-owned subsidiary of
PAHC,  PAHC  does not have any  direct  or  indirect  subsidiaries  and does not
directly or indirectly own, control, or hold with the power to

                                     - 15 -

<PAGE>


vote any shares of the capital  stock of any company  (except  shares held by PA
Bank for the  account of others in a  fiduciary  or  custodial  capacity  in the
ordinary  course of its  business  and  shares of the  Federal  Reserve  Bank of
Philadelphia  and the  Federal  Home  Loan  Bank of  Pittsburgh).  There  are no
outstanding  subscriptions,  options, warrants,  convertible securities,  calls,
commitments,  or agreements  calling for or requiring  the  issuance,  transfer,
sale,  or other  disposition  of any shares of the capital  stock of PA Bank, or
calling for or requiring the issuance of any  securities  or rights  convertible
into or exchangeable  for shares of capital stock of PA Bank. There are no other
direct or indirect subsidiaries of PAHC which are required to be consolidated or
accounted for on the equity method in the consolidated  financial  statements of
PAHC  or the  financial  statements  of PA  Bank  prepared  in  accordance  with
generally accepted accounting principles.

          (b) Except as specified in the previous  subsection,  neither PAHC nor
PA Bank has a direct or indirect equity or ownership interest which represents 5
percent or more of the  aggregate  equity or  ownership  interest  of any entity
(including, without limitation, corporations, partnerships, and joint ventures).

     6.9. Capital Structure.

          (a) The authorized  capital stock of PAHC consists of 1,000,000 shares
of PAHC Preferred Stock,  $10.00 par value, none of which have been issued as of
the date of this  Agreement,  and  25,000,000  shares of PAHC Common  Stock,  of
which, as of the date of this Agreement,  2,864,307 shares have been duly issued
and  are  validly  outstanding,  fully  paid,  and  nonassessable,  and  held by
approximately  1,460 shareholders of record, and an additional 71,600 shares are
held in the treasury of PAHC. The aforementioned shares of PAHC Common Stock are
the only voting securities of PAHC authorized, issued, or outstanding as of such
date;  and except as set forth on Schedule 6.9 hereof,  there are no outstanding
subscriptions, options, warrants, convertible securities, calls, commitments, or
agreements  calling for or requiring  the  issuance,  transfer,  sale,  or other
disposition  of any  shares of the  capital  stock of PAHC,  or  calling  for or
requiring  the  issuance  of  any  securities  or  rights  convertible  into  or
exchangeable  for shares of capital stock of PAHC. None of the PAHC Common Stock
is subject to any restrictions  upon the transfer thereof under the terms of the
articles of incorporation or bylaws of PAHC.

          (b) Schedule 6.9 hereof lists all options to purchase PAHC  securities
currently  outstanding and, for each such option, the date of issuance,  date of
exercisability, exercise price, type of security for which exercisable, and date
of expiration. Schedule 6.9 hereof further lists all shares of PAHC Common Stock
reserved  for  issuance   pursuant  to  stock  option  plans,   agreements,   or
arrangements but not yet issued and all options upon shares of PAHC Common Stock
designated or made available for grant but not yet granted.

          (c) The authorized capital stock of PA Bank consists of 325,000 shares
of common stock,  $10.00 par value (the "PA Bank Common Stock"), of which, as of
the date of this Agreement, 267,748 shares have been duly issued and are validly
outstanding, fully paid, and nonassessable,  and all of which are held of record
and  beneficially by PAHC directly,  free and clear of any adverse  claims.  The
aforementioned  shares of PA Bank Common Stock are the only voting securities of
PA Bank authorized,  issued, or outstanding as of such date. None of the PA Bank
Common Stock is subject to any restrictions  upon the transfer thereof under the
terms of the  corporate  charter  or bylaws of PA Bank or under the terms of any
agreement to which PA Bank is a party or under which it is bound.

          (d) None of the shares of PAHC Common  Stock or PA Bank  Common  Stock
has been issued in violation of the preemptive rights of any shareholder.

          (e) As of the date hereof,  to the best of the knowledge of PAHC,  and
except  for  this  Agreement,  there  are no  shareholder  agreements,  or other
agreements,  understandings,  or commitments relating to the right of any holder
or beneficial owner of more than 1 percent of the issued and outstanding  shares
of any class of

                                     - 16 -

<PAGE>


the capital stock of either PAHC or PA Bank to vote or to dispose of his, her or
its shares of capital stock of that entity.

     6.10.  Articles of Incorporation,  Bylaws,  and Minute Books. The copies of
the articles of incorporation  or association and all amendments  thereto and of
the bylaws, as amended,  of PAHC and PA Bank that have been provided to NBTB are
true, correct, and complete copies thereof. The minute books of PAHC and PA Bank
that have been made available to NBTB contain  accurate  minutes of all meetings
and  accurate  consents in lieu of meetings of the board of  directors  (and any
committee  thereof)  and of the  shareholders  of PAHC and PA Bank  since  their
respective  inceptions.  These minute books accurately  reflect all transactions
referred to in such  minutes and  consents in lieu of meetings  and disclose all
material  corporate  actions of the shareholders and boards of directors of PAHC
and PA Bank and all  committees  thereof.  Except as  reflected  in such  minute
books,  there are no minutes of  meetings or consents in lieu of meetings of the
board of directors (or any committee  thereof) or of  shareholders of PAHC or PA
Bank.

     6.11. Books and Records.  The books and records of each of PAHC and PA Bank
fairly  reflect  the  transactions  to  which  it is a  party  or by  which  its
properties are subject or bound.  Such books and records have been properly kept
and  maintained  and  are  in  compliance  in all  material  respects  with  all
applicable  accounting and legal requirements.  Each of PAHC and PA Bank follows
generally  accepted  accounting  principles applied on a consistent basis in the
preparation and maintenance of its books of account and financial statements.

     6.12. Regulatory Approvals and Filings, Contracts,  Commitments,  etc. PAHC
has made available to NBTB:

          (a) All regulatory  approvals  received since January 1, 1992, of PAHC
and PA Bank relating to all bank and nonbank  acquisitions or the  establishment
of de novo operations;

          (b) All employment contracts, election contracts, retention contracts,
deferred  compensation,  non-competition,  bonus, stock option,  profit-sharing,
pension,  retirement,   consultation  after  retirement,   incentive,  insurance
arrangements  or  plans  (including  medical,  disability,  group  life or other
insurance  plans),  and any other  remuneration  or fringe benefit  arrangements
applicable to employees,  officers, or directors of PAHC or PA Bank, accompanied
by any agreements,  including trust agreements, embodying such contracts, plans,
or arrangements,  and all employee manuals and memoranda  relating to employment
and benefit  policies  and  practices of any nature  whatsoever  (whether or not
distributed to employees or any of them),  and any actuarial  reports and audits
relating to such plans;

          (c)  All  material  contracts,   agreements,  leases,  mortgages,  and
commitments  to which PAHC or PA Bank is a party or may be bound;  or, if any of
the same be oral, true,  accurate,  and complete  written  summaries of all such
oral contracts, agreements, leases, mortgages, and commitments;

          (d) All contracts,  agreements,  leases,  mortgages,  and commitments,
whether or not material, to which PAHC or PA Bank is a party or may be bound and
which  require the consent or approval  of third  parties to the  execution  and
delivery of this Agreement or to the  consummation  or performance of any of the
transactions  contemplated  thereby  or,  if any  of the  same  be  oral,  true,
accurate, and complete written summaries of all such oral contracts, agreements,
leases, mortgages, and commitments;

          (e)  All  deeds,  leases,   contracts,   agreements,   mortgages,  and
commitments, whether or not material, to which PAHC or PA Bank is a party or may
be bound and which relate to land,  buildings,  fixtures, or other real property
upon or within which PAHC or PA Bank operates its businesses or is authorized to
operate  its  businesses,  or with  respect  to  which  PAHC or PA Bank  has any
application pending for authorization to operate its businesses;

                                     - 17 -

<PAGE>


          (f) Any pending  application,  including  any  documents  or materials
related  thereto,  which has been  filed by PAHC or PA Bank with any  federal or
state regulatory agency with respect to the establishment of a new office or the
acquisition or establishment of any additional banking or nonbanking subsidiary;
and

          (g) All federal,  state, and local tax returns,  including any amended
returns, filed by PAHC or PA Bank for the years 1995 through 1998, a copy of the
calculation of the 1999 tax provision made by PAHC for the year 1999 as recorded
on its books and records, and a copy of all substantive  correspondence or other
documents with respect to any examination that has not yet been resolved, a copy
of the most recent  examination  from each state or local tax agency if any, for
each of PAHC and PA Bank, and a copy of all substantive  correspondence or other
documents with respect to any  examination  that has not yet been resolved,  and
all tax rulings, closing agreements, settlement agreements, or similar documents
with respect to PAHC or PA Bank  received from or entered into with the Internal
Revenue Service (the "IRS") or any other taxing  authority since January 1, 1989
or that would have continuing effect after the Effective Time.

     6.13.  Financial  Statements.  PAHC has furnished to NBTB its  consolidated
audited  statement of  condition  as of each of December 31, 1996,  December 31,
1997, and December 31, 1998, and its related audited  consolidated  statement of
income,  consolidated  statement of cash flows,  and  consolidated  statement of
changes in  stockholders'  equity for each of the periods  then  ended,  and the
notes  thereto,  and its  consolidated  unaudited  statement  of condition as of
September 30, 1999 and its related unaudited  consolidated  statement of income,
consolidated  statement of cash flows, and consolidated  statement of changes in
stockholders'  equity for the period then ended, and the notes thereto,  each as
filed with the SEC (collectively,  the "PAHC Financial Statements").  All of the
PAHC Financial Statements,  including the related notes, (a) except as indicated
in the notes  thereto,  were  prepared in  accordance  with  generally  accepted
accounting principles consistently applied in all material respects (subject, in
the case of unaudited  statements,  to  recurring  audit  adjustments  normal in
nature and amount), (b) are in accordance with the books and records of PAHC and
PA Bank, (c) fairly reflect the  consolidated  financial  position of PAHC as of
such dates, and the  consolidated  results of operations of PAHC for the periods
ended on such dates,  and do not fail to disclose any material  extraordinary or
out-of-period  items,  and (d) reflect,  in accordance  with generally  accepted
accounting  principles  consistently applied in all material respects,  adequate
provision for, or reserves  against,  the consolidated loan losses of PAHC as of
such dates.

     6.14. Call Reports; Bank Holding Company Reports.

          (a) PA Bank has made available to NBTB its FFIEC Consolidated  Reports
of Condition  and Income ("Call  Reports") for the calendar  quarter dated March
31,  1996  and each  calendar  quarter  thereafter.  All of such  Call  Reports,
including  the  related   schedules  and  memorandum  items,  were  prepared  in
accordance with generally accepted accounting principles consistently applied in
all  material  respects  or, to the extent  different  from  generally  accepted
accounting   principles,   accounting  principles  mandated  by  the  applicable
instructions to such Call Reports.

          (b) No  adjustments  are  required  to be made to the  equity  capital
account  of PA  Bank as  reported  on any of the  Call  Reports  referred  to in
Subsection  6.14(a)  hereof,  in any material  amount,  in order to conform such
equity  capital  account to equity  capital as would be determined in accordance
with generally accepted accounting principles as of such date.

          (c) PAHC has  furnished  to NBTB its  annual  report on Form FR Y-6 as
filed with the Board of Governors as of December 31, 1998 and all amendments and
periodic and current reports filed with the Board of Governors under the BHC Act
subsequent to December 31, 1998.

     6.15.  Absence of Undisclosed  Liabilities.  At September 30, 1999, neither
PAHC  nor PA  Bank  had any  obligation  or  liability  of any  nature  (whether
absolute, accrued, contingent, or otherwise, and whether due or to

                                     - 18 -

<PAGE>


become  due)  which  was  material,  or which  when  combined  with all  similar
obligations or  liabilities  would have been  material,  to PAHC,  except (a) as
disclosed in the PAHC Financial Statements, or (b) as set forth on Schedule 6.15
hereof,  or (c) for  unfunded  loan  commitments  made by PAHC or PA Bank in the
ordinary course of their business consistent with past practice. The amounts set
up as  current  liabilities  for  taxes in the  PAHC  Financial  Statements  are
sufficient  for the payment of all  federal,  state,  local and foreign  income,
payroll, withholding,  excise, sales, use, personal property, use and occupancy,
business and  occupation,  mercantile,  real estate,  gross  receipts,  license,
employment,  severance,  stamp, premium,  windfall profits,  social security (or
similar  unemployment),   disability,   transfer,   registration,  value  added,
alternative,  or add-on minimum,  estimated,  or capital stock and franchise tax
and  other  tax of any kind  whatsoever,  including  any  interest,  penalty  or
addition  thereto,  whether  disputed  or not  ("Tax"  or  "Taxes")  accrued  in
accordance with generally accepted accounting principles and unpaid at September
30, 1999.  Since  September  30, 1999,  neither PAHC nor PA Bank has incurred or
paid any  obligation  or  liability  that would be material  (on a  consolidated
basis) to PAHC,  except (x) for obligations  incurred or paid in connection with
transac tions by it in the ordinary course of its business  consistent with past
practices,  or (y) as set forth on Schedule  6.15  hereof,  or (z) as  expressly
contemplated herein.

     6.16. Absence of Certain Developments.  Since September 30, 1999, except as
set forth on Schedule 6.16 hereof, there has been (a) no Material Adverse Effect
with respect to PAHC and PA Bank, (b) no material  deteriora tion in the quality
of the  consolidated  loan  portfolio of PAHC,  and no material  increase in the
consolidated  level of nonperforming  assets or non-accrual  loans at PAHC or in
the level of its  consolidated  provision for credit losses or its  consolidated
reserve for credit losses; (c) no declaration, setting aside, or payment by PAHC
or PA Bank of any regular dividend, special dividend, or other distribution with
respect to any class of capital stock of PAHC or PA Bank, other than, subject to
the dividend-coordination provisions of section 7.9 of this Agreement, customary
cash  dividends paid by PAHC whose amounts have not exceeded $0.20 per share per
calendar  quarter and the intervals  between which  dividends have not been more
frequent than past practice,  and other than customary cash dividends paid by PA
Bank whose amounts have not exceeded  past  practice and the  intervals  between
which  dividends  have  not  been  more  frequent  than  past  practice;  (d) no
repurchase  by  PAHC  of  any of  its  capital  stock;  (e)  no  material  loss,
destruction,  or damage to any material property of PAHC or PA Bank, which loss,
destruction,  or  damage  is not  covered  by  insurance;  and  (f) no  material
acquisition or disposition of any asset,  nor any material  contract outside the
ordinary course of business  entered into by PAHC or PA Bank nor any substantial
amendment or termination of any material contract outside the ordinary course of
business to which PAHC or PA Bank is a party, nor any other  transaction by PAHC
or PA Bank involving an amount in excess of $50,000 other than for fair value in
the ordinary  course of its business.  Since  September 30, 1999,  except as set
forth on Schedule  6.16 hereof,  (x) each of PAHC and PA Bank has  conducted its
business only in the ordinary  course of such business and consistent  with past
practice;  (y) PAHC, on a consolidated  basis, has maintained the quality of its
loan  portfolio and that of each of its major  components at  approximately  the
same level as existed at September  30, 1999;  and (z) PAHC,  on a consoli dated
basis,  has administered  its investment  portfolio  pursuant to essentially the
same policies and  procedures as existed during 1997 and 1998 and the first nine
months of 1999, and has taken no action to lengthen the average  maturity of the
investment  portfolio,  or of any significant  category thereof, to any material
extent.

     6.17.  Reserve for Credit  Losses.  The most  recent of the PAHC  Financial
Statements reflect a consolidated  reserve for credit losses that is adequate in
accordance with generally  accepted  accounting  principles to absorb reasonably
anticipated  losses in the  consolidated  loan and lease  portfolios of PAHC, in
view of the size and character of such portfolios,  current economic conditions,
and other pertinent factors. Management reevaluates the adequacy of such reserve
quarterly based on portfolio performance, current economic conditions, and other
factors.

     6.18. Tax Matters.

          (a) Except as set forth on Schedule  6.18 hereof,  all Tax returns and
reports required to be filed by or on behalf of PAHC or PA Bank have been timely
filed with the appropriate  governmental  agencies in all jurisdictions in which
such  returns and reports are required to be filed,  or requests for  extensions
have been timely

                                     - 19 -

<PAGE>


filed,  granted,  and have not expired for periods ending on or before  December
31, 1998,  and all returns filed are complete and accurate and properly  reflect
its Taxes for the  periods  covered  thereby.  All Taxes shown or required to be
shown on filed  returns have been paid,  except for any not yet due and payable.
As of the date hereof,  there is no audit,  examination,  deficiency,  or refund
litigation or tax claim or any notice of  assessment  or proposed  assessment by
the IRS or any other taxing  authority,  or any other matter in controversy with
respect to any Taxes that might result in a determination  adverse to PAHC or PA
Bank,  except as reserved  against in the PAHC Financial State ments.  All Taxes
due with respect to completed and settled  examinations or concluded  litigation
have been properly accrued or paid.

          (b) Except as set forth on Schedule  6.18 hereof,  neither PAHC nor PA
Bank has executed an extension  or waiver of any statute of  limitations  on the
assessment or collection of any Tax due that is currently in effect.

          (c) To the extent  any Taxes are due from,  but have not yet been paid
by,  PAHC or PA Bank for the  period or  periods  beginning  January  1, 1999 or
thereafter  through and including the Effective Time,  adequate  provision on an
estimated basis has been made for the payment of such taxes by  establishment of
appropriate tax liability accounts on the monthly financial statements of PAHC.

          (d)  Deferred  Taxes of PAHC and PA Bank  have  been  provided  for in
accordance  with generally  accepted  accounting  principles as in effect on the
date of this Agreement.

          (e) The  deductions  of PA Bank for bad debts taken and the reserve of
PA Bank for loan losses for federal  income tax  purposes at December  31, 1998,
were not greater  than the maximum  amount  permitted  under the  provisions  of
section 585 of the Code.

          (f) Other than liens  arising  under the laws of the United  States or
the Commonwealth of Pennsylvania  with respect to Taxes assessed and not yet due
and payable,  there are no tax liens on any of the proper ties or assets of PAHC
or PA Bank.

          (g) PAHC and PA Bank (i) have timely filed all information  returns or
reports required to be filed with respect to Taxes, including but not limited to
those required by sections 6041,  6041A,  6042, 6045, 6049,  6050H, and 6050J of
the Code,  (ii) have  properly and timely  provided to all  persons,  other than
taxing  authorities,  all  information  reports or other documents (for example,
Form 1099s,  Form W-2s,  and so forth)  required to be provided to such  persons
under  applicable  law,  and (iii) have  exercised  due  diligence  in obtaining
certified taxpayer identifica tion numbers as required under applicable law.

          (h) The taxable  year end of PAHC for federal  income tax purposes is,
and since the inception of PAHC has continuously been, December 31.

          (i) PAHC  and PA Bank  have in all  material  respects  satisfied  all
federal,  state, local, and foreign  withholding tax requirements  including but
not limited to income, social security, and employment tax withholding.

          (j) Neither  PAHC nor PA Bank (i) is, or has been, a member of a group
filing a consolidated,  combined,  or unitary tax return, other than a group the
common  parent of which is or was PAHC,  or (ii) has any liability for the Taxes
of any person  (other than PAHC and PA Bank) under Treas.  Reg.ss.  1.1502-6 (or
any similar  provision of state,  local,  or foreign  law),  as a transferee  or
successor, by contract, or otherwise.

     6.19.  Consolidated  Net Worth.  The  consolidated net worth of PAHC on the
date of this  Agreement,  as determined in accordance  with  generally  accepted
accounting principles but without regard to the change in

                                     - 20 -

<PAGE>


unrealized  gains and losses on securities (net of  reclassification  adjustment
and tax effects) between  September 30, 1999 and the date of this Agreement,  is
not less than the sum of (a)  $31,906,000,  (b) the proceeds to PAHC of the sale
of treasury stock since  September 30, 1999, and (c) the proceeds to PAHC of the
exercise  of stock  options  to  purchase  shares  of PAHC  Common  Stock  since
September 30, 1999.

     6.20. Examinations.  To the extent consistent with law, PAHC has heretofore
disclosed   to  NBTB   relevant   information   contained  in  the  most  recent
safety-and-soundness,  compliance, Community Reinvestment Act, and other Reports
of  Examination  with respect to PAHC issued by the Board of  Governors  and the
most recent safety- and-soundness,  compliance,  Community Reinvestment Act, and
other  Reports of  Examination  with respect to PA Bank issued by the OCC.  Such
information so disclosed  consists of all material  information  with respect to
the financial,  operational, and legal condition of the entity under examination
which is included in such reports.

     6.21. Reports. Since January 1, 1996, each of PAHC and PA Bank has effected
all  registrations  and filed all  reports  and  statements,  together  with any
amendments  required to be made with respect  thereto,  which it was required to
effect or file with (a) the Board of Governors,  (b) the OCC, (c) the FDIC,  (d)
the United  States  Department  of the  Treasury,  (e) the  Department,  (e) the
Securities and Exchange Commission, and (f) any other governmental or regulatory
authority  or  agency  having  jurisdiction  over its  operations.  Each of such
registrations,  reports,  and  documents,  including the  financial  statements,
exhibits,  and schedules  thereto,  does not contain any statement which, at the
time and in the light of the circumstances  under which it was made, is false or
misleading  with  respect  to any  material  fact or which  omits  to state  any
material fact  necessary in order to make the statements  contained  therein not
false or misleading.

     6.22. FIRA Compliance and Other Transactions with Affiliates. Except as set
forth  on  Schedule  6.22  hereof,  (a)  none  of the  officers,  directors,  or
beneficial  holders of 5 percent or more of the common  stock of PAHC or PA Bank
and  no  person   "controlled"  (as  that  term  is  defined  in  the  Financial
Institutions  Regulatory  and  Interest  Rate Control Act of 1978) by PAHC or PA
Bank (collectively,  "Insiders") has any ongoing material  transaction with PAHC
or PA Bank on the  date of this  Agreement;  (b) no  Insider  has any  ownership
interest in any business, corporate or otherwise, which is a party to, or in any
property which is the subject of, business  arrangements or relationships of any
kind with PAHC or PA Bank not in the ordinary  course of  business;  and (c) all
other  extensions  of credit by PAHC or PA Bank to any Insider  have  heretofore
been disclosed in writing by PAHC to NBTB.

     6.23.  SEC  Registered  Securities.  Other than the PAHC Common  Stock,  no
equity or debt  securities  of PAHC or PA Bank are  registered or required to be
registered  under the Securities Act or the Securities  Exchange Act of 1934, as
amended (the "Exchange Act").

     6.24.  Legal  Proceedings.  Except  as  disclosed  in  the  PAHC  Financial
Statements or as set forth on Schedule 6.24 hereof,  there is no claim,  action,
suit, arbitration, investigation, or other proceeding pending against PAHC or PA
Bank before any court, governmental agency, authority or commission, arbitrator,
or  "impartial  mediator"  or, to the best of the knowledge of PAHC and PA Bank,
threatened  or  contemplated  against or affecting it or its  property,  assets,
interests,  or rights,  or any basis  therefor  of which  notice has been given,
which, if adversely determined,  would have a Material Adverse Effect on PAHC or
which otherwise could prevent, hinder, or delay consummation of the transactions
contemplated by this Agreement.

     6.25. Absence of Governmental Proceedings.  Except as set forth on Schedule
6.25 hereof,  neither PAHC nor PA Bank is a party defendant or respondent to any
pending legal,  equitable,  or other  proceeding  commenced by any  governmental
agency and, to the best of the knowledge of PAHC and PA Bank, no such proceeding
is threatened.

                                     - 21 -

<PAGE>


     6.26. Federal Deposit Insurance.

          (a) The deposits held by PA Bank are insured within  statutory  limits
by the Bank Insurance Fund of the FDIC (the "BIF") pursuant to the provisions of
the Federal Deposit  Insurance Act, as amended (12 U.S.C. ss. 1811 et seq.) (the
"FDI Act"),  and PA Bank has paid all regular  premiums and special  assessments
and filed all related reports and statements required under the FDI Act.

          (b) PA Bank is a member of and pays insurance  assessments to the BIF.
None of the deposits of PA Bank are insured by the Savings Association Insurance
Fund of the FDIC (the "SAIF"), and PA Bank pays no insurance  assessments to the
SAIF.

     6.27.  Other  Insurance.  Each of PAHC and PA Bank carries  insurance  with
reputable  insurers,  including  blanket bond  coverage,  in such amounts as are
reasonable to cover such risks as are customary in relation to the character and
location of its properties and the nature of its  businesses.  All such policies
of insurance  are in full force and effect,  and no notice of  cancellation  has
been received.  All premiums to date have been paid in full. Neither PAHC nor PA
Bank is in default with respect to any such policy which is material to it.

     6.28. Labor Matters.

          (a) Neither PAHC nor PA Bank is a party to or bound by any  collective
bargaining  contracts  with respect to any  employees of PAHC or PA Bank.  Since
their respective inceptions there has not been, nor to the best of the knowledge
of PAHC and PA Bank was  there or is there  threatened,  any  strike,  slowdown,
picketing,  or work  stoppage by any union or other group of  employees  against
PAHC or PA Bank or any of its  premises,  or any other  labor  trouble  or other
occurrence,  event, or condition of a similar character.  As of the date hereof,
neither  PAHC nor PA Bank is aware of any  attempts  to  organize  a  collective
bargaining unit to represent any of its employee groups.

          (b) As of the date hereof, each of PAHC and PA Bank is, to the best of
its knowledge, in compliance in all material respects with all federal and state
laws,  regulations,  and orders respecting  employment and employment  practices
(including  Title VII of the Civil Rights Act of 1964),  terms and conditions of
employment,  and wages and hours; and neither PAHC nor PA Bank is engaged in any
unfair labor  practice.  As of the date hereof,  except as set forth on Schedule
6.28 hereof,  no dispute  exists between PAHC or PA Bank and any of its employee
groups  regarding  any employee  organization,  wages,  hours,  or conditions of
employment which would  materially  interfere with the business or operations of
PAHC or PA Bank.

     6.29. Employee Benefit Plans.

          (a)  Schedule  6.29 hereto  contains a complete  list of all  pension,
retirement,   stock  purchase,  stock  bonus,  stock  ownership,  stock  option,
performance  share,  stock  appreciation  right,  phantom  stock,  savings,  and
profit-sharing plans, all employment, deferred compensation,  consulting, bonus,
and collective  bargaining agree ments, and group insurance  contracts and other
incentive,   welfare,  life  insurance,  death  or  survivor's  benefit,  health
insurance, sickness, disability,  medical, surgical, hospital, severance, layoff
and vacation plans,  contracts,  and arrangements and employee benefit plans and
agreements, whether or not subject to ERISA, whether formal or informal, whether
written or oral,  whether  legally  binding or not,  under  which any current or
former  employee of PAHC or PA Bank has any present right to future  benefits or
payments  or under  which PAHC or PA Bank has any  present  or future  liability
(together, the "PAHC Plans").

          (b) As to each of the PAHC  Plans,  PAHC has  made  available  to NBTB
true,  complete,  current,  and accurate copies of (i) the executed  document or
documents governing the plan,  including the related trust agreement,  insurance
policy,  and summary plan  description  (or other  description in the case of an
unwritten

                                     - 22 -

<PAGE>


plan);  (ii) the most recent and prior two years' actuarial and financial report
prepared  with respect to the plan if it  constitutes  a "qualified  plan" under
section 401(a) of the Code; (iii) the Forms 5500 with all schedules for the last
three years; (iv) all IRS rulings,  determination letters, and any open requests
for such  rulings and letters  that  pertain to the plan;  and (v) to the extent
they  pertain  to the plan,  attorneys'  responses  to  auditors'  requests  for
information for the last three years.

          (c) Except for  funding  obligations  and  liabilities  to the Pension
Benefit Guaranty  Corporation  ("PBGC") pursuant to section 4007 of the Employee
Retirement Income Security Act of 1974, as amended ("ERISA"),  all of which have
been fully paid,  neither  PAHC nor PA Bank has any tax,  penalty,  or liability
with respect to any PAHC Plan under  ERISA,  the Code,  or any other  applicable
law,  regulation,  or ruling.  As to each PAHC Plan with respect to which a Form
5500 has been filed, no material change has occurred with respect to the matters
covered by the most recent Form 5500 since the date thereof,  other than regular
accruals and contributions.

          (d) Each PAHC Plan  intended to be a  "qualified  plan" under the Code
complies with ERISA and applicable  provisions of the Code.  Neither PAHC nor PA
Bank has any material  liability  under any PAHC Plan which is not  reflected on
the PAHC Financial  Statements (other than such normally unrecorded  liabilities
under the Plans for sick leave, holiday, education,  bonus, vacation,  incentive
compensation,  and anniversary awards, provided that such liabilities are not in
any event  material).  There have not been any  "prohibited  transactions"  with
respect to any PAHC Plan within the  meaning of section  406 of ERISA or,  where
applicable,  section  4975 of the  Code,  nor have  there  been any  "reportable
events"  within  section 4043 of ERISA nor any  accumulated  funding  deficiency
within section 302 of ERISA or section 402 of the Code. Neither PAHC nor PA Bank
nor any entity under common  control  under section  414(b),  (c), or (m) of the
Code has or had any  obligation to contribute to any  multiemployer  plan. As to
each PAHC Plan that is subject to Title IV of ERISA, the value of assets of such
PAHC Plan is at least  equal to the  present  value of the vested  and  unvested
accrued  benefits in such PAHC Plan on a termination  and ongoing  basis,  based
upon applicable PBGC regulations and the actuarial  methods and assumptions used
in the most  recent  actuarial  report.  Except  as set forth on  Schedule  6.29
hereof,  neither PAHC nor PA Bank has any obligation to provide  retiree welfare
benefits.

          (e) No  action,  claim,  or  demand  of any kind has been  brought  or
threatened by any potential  claimant or representative of such a claimant under
any plan, contract, or arrangement referred to in subsection (a) of this section
6.29, other than routine claims for benefits in the ordinary course,  where PAHC
or PA Bank may be either (i) liable  directly on such action,  claim, or demand;
or (ii)  obligated to  indemnify  any person,  group of persons,  or entity with
respect to such action, claim, or demand which is not fully covered by insurance
maintained with reputable,  responsible  financial insurers or by a self-insured
plan.

     6.30.  Compensation.  Schedule  6.30  hereto  contains  a true and  correct
statement of the names,  relationships  with PAHC and PA Bank,  present rates of
compensation  (whether  in the form of salary,  bonuses,  commissions,  or other
supplemental  compensation now or hereafter payable), and aggregate compensation
for the fiscal year ended December 31, 1998 of each director,  officer, or other
employee of PAHC and PA Bank whose  aggregate  compen sation for the fiscal year
ended  December 31, 1998 exceeded  $60,000 or whose  aggregate  compensation  at
present  exceeds the rate of $60,000 per annum.  Except as set forth on Schedule
6.30  hereto,  since  December 31, 1998 neither PAHC nor PA Bank has changed the
rate of  compensation  of any of its  directors,  officers,  employees,  agents,
dealers,  or  distributors,  nor has any PAHC Plan or program been instituted or
amended to increase  benefits  thereunder.  Except as set forth on Schedule 6.30
hereto, there is no contract,  agreement,  plan,  arrangement,  or understanding
covering any person that,  individually or collectively,  could give rise to the
payment of any amount that would not be  deductible by PAHC or PA Bank by reason
of section 280G of the Code.

     6.31. Fiduciary Activities. PA Bank engages and, since January 1, 1998, has
engaged  in (a) no  fiduciary  or  custodial  activity  that would  require  its
qualification  or  registration  under the laws of any  jurisdiction  and (b) no
advisory  activity  that  would  require  it to  register  under the  Investment
Advisers Act of 1940.

                                     - 23 -

<PAGE>


     6.32. Environmental Liability.

          (a) Except as set forth on Schedule  6.32 hereof,  neither PAHC nor PA
Bank is in violation of any  judgment,  decree,  order,  law,  license,  rule or
regulation  pertaining to environmental  matters,  including those arising under
the Resource  Conservation  and Recovery  Act, the  Comprehensive  Environmental
Response,  Compensation  and  Liability  Act of 1980  ("CERCLA"),  the Superfund
Amendments and  Reauthorization Act of 1986, the Federal Water Pollution Control
Act, the Federal Clean Air Act, the Toxic Substances Control Act or any state or
local statute, regulation, ordinance, order or decree relating to health, safety
or the environment ("Environmental Laws").

          (b) Except as set forth on Schedule  6.32  hereof,  neither  PAHC,  PA
Bank,  nor, to the best of the knowledge of either of them, any borrower of PAHC
or of PA Bank has  received  notice  that it has been  identified  by the United
States Environmental  Protection Agency as a potentially responsible party under
CERCLA with respect to a site listed on the National  Priorities List, 40 C.F.R.
Part 300 Appendix B, nor has PAHC or PA Bank or, to the best of the knowledge of
either of them,  any borrower of PAHC or of PA Bank  received  any  notification
that any hazardous  waste, as defined by 42 U.S.C.  ss.  6903(5),  any hazardous
substances,   as  defined  by  42  U.S.C.  ss.   9601(14),   any  "pollutant  or
contaminant,"  as defined by 42 U.S.C.  ss.  9601(33),  or any toxic  substance,
hazardous  materials,  oil, or other  chemicals or  substances  regulated by any
Environmental  Laws  ("Hazardous  Substances")  that it has disposed of has been
found at any site at which a federal or state  agency is  conducting  a remedial
investigation or other action pursuant to any Environmental Law.

          (c) No  portion  of any real  property  at any time owned or leased by
PAHC or PA Bank (collectively,  the "PAHC Real Estate") has been used by PAHC or
PA  Bank  for  the  handling,  processing,  storage  or  disposal  of  Hazardous
Substances in a manner which violates any Environmental Laws and, to the best of
the  knowledge of PAHC and PA Bank,  no  underground  tank or other  underground
storage  receptacle for Hazardous  Substances is located on any of the PAHC Real
Estate. In the course of its activities,  neither PAHC nor PA Bank has generated
or is generating any hazardous  waste on any of the PAHC Real Estate in a manner
which  violates  any  Environmental  Laws.  There  has  been no past or  present
releasing, spilling, leaking, pumping, pouring, emitting, emptying, discharging,
injecting,  escaping, leaching, disposing or dumping (collectively, a "Release")
of Hazardous  Substances  by PAHC or PA Bank on,  upon,  or into any of the PAHC
Real  Estate.  In  addition,  to the best of the  knowledge of PAHC and PA Bank,
except as set forth on Schedule  6.32 hereof,  there have been no such  Releases
on,  upon,  or into any real  property  in the  vicinity of any of the PAHC Real
Estate that, through soil or groundwater contamination, may be located on any of
such PAHC Real Estate.

          (d) With respect to any real  property at any time held as  collateral
for any outstanding loan by PAHC or PA Bank (collectively,  the "Collateral Real
Estate"),  except as set forth on Schedule 6.32 hereof, neither PAHC nor PA Bank
has since  January 1, 1988  received  notice from any borrower  thereof or third
party,  and has no knowledge,  that such borrower has generated or is generating
any  hazardous  waste on any of the  Collateral  Real  Estate in a manner  which
violates any Environmental  Laws or that there has been any Release of Hazardous
Substances by such borrower on, upon, or into any of the Collateral Real Estate,
or that there has been any Release on,  upon,  or into any real  property in the
vicinity of any of the Collateral Real Estate that,  through soil or groundwater
contamination, may be located on any of such Collateral Real Estate.

          (e) As used in this  section  6.32,  each of the terms  "PAHC" and "PA
Bank"  includes the  applicable  entity and any  partnership or joint venture in
which it or any of its subsidiaries has an interest.

     6.33.  Intangible  Property.  To the best of the  knowledge  of PAHC and PA
Bank, each of them owns or possesses the right,  free of the claims of any third
party, to use all material trademarks,  service marks, trade names,  copyrights,
patents,  and licenses  currently used by it in the conduct of its business.  To
the best of the  knowledge of PAHC and PA Bank,  no material  product or service
offered and no material trademark, service mark, or similar right

                                     - 24 -

<PAGE>


used by either of them infringes any rights of any other person,  and, as of the
date hereof, neither PAHC nor PA Bank has received any written or oral notice of
any claim of such infringement.

     6.34.  Real and  Personal  Property.  Except as set forth on Schedule  6.34
hereof, and except for property and assets disposed of in the ordinary course of
business,  each of PAHC and PA Bank possesses  good and marketable  title to and
owns, free and clear of any mortgage, pledge, lien, charge, or other encumbrance
or other third party interest of any nature  whatsoever  which would  materially
interfere  with the business or operations  of either PAHC or PA Bank,  its real
and personal  property and other  assets,  including  without  limitation  those
properties and assets reflected in the PAHC Financial Statements as of September
30, 1999, or acquired by PAHC or PA Bank  subsequent  to the date  thereof.  The
leases  pursuant  to which PAHC and PA Bank lease real or  personal  property as
lessee are valid and effective in accordance with their  respective  terms;  and
there is not, under any such lease,  any material  existing default or any event
which, with the giving of notice or lapse of time or otherwise, would constitute
a material  default.  The real and personal property leased by either PAHC or PA
Bank as lessee is free from any adverse claim which would  materially  interfere
with its business or operation  taken as a whole.  The material  proper ties and
equipment owned or leased as lessee by PAHC and PA Bank are in normal  operating
condition,  free from any known  defects,  except  such minor  defects as do not
materially interfere with the continued use thereof in the conduct of its normal
operations.

     6.35. Loans, Leases, and Discounts.

          (a) To the  best of the  knowledge  of PAHC and PA  Bank,  each  loan,
lease,  and  discount  reflected  as an  asset  of  PAHC in the  PAHC  Financial
Statements as of September 30, 1999, or acquired  since that date, is the legal,
valid,  and binding  obligation of the obligor  named  therein,  enforceable  in
accordance  with its terms;  and no loan,  lease,  or discount  having an unpaid
balance  (principal  and  accrued  interest)  in  excess  of  $50,000,   and  no
outstanding  letter of credit or  commitment  to extend credit having a notional
amount in excess of $50,000,  is subject to any  asserted  defense,  offset,  or
counterclaim known to PAHC or PA Bank.

          (b) Except as set forth on Schedule  6.35 hereof,  neither PAHC nor PA
Bank  holds  any  loans  or  loan-participation  interests  purchased  from,  or
participates in any loans originated by, any person other than PAHC or PA Bank.

     6.36. Material  Contracts.  Neither PAHC nor PA Bank nor any of the assets,
businesses, or operations of either of them is as of the date hereof a party to,
or is bound or affected by, or receives  benefits under any material  agreement,
arrangement,  or commitment not cancelable by it without penalty, other than (a)
the  agreements  set forth on  Schedule  6.36 hereof or set forth in one or more
other  schedules  of this  Agreement,  and (b)  agreements,  arrange  ments,  or
commitments  entered into in the ordinary course of its business consistent with
past practice,  or, if there has been no past practice,  consistent with prudent
banking practices.

     6.37.  Employment  and  Severance  Arrangements.  Schedule 6.37 hereof sets
forth

          (a) all employment  contracts granted by PAHC or PA Bank to any of its
officers,  directors,  shareholders,  consultants, or other management officials
and any officer,  director,  shareholder,  consultant, or management official of
any affiliate  providing for increased or accelerated  compensation in the event
of a change  of  control  with  respect  to PAHC or PA Bank or any  other  event
affecting the ownership, control, or management of PAHC or PA Bank; and

          (b)  all  employment   and  severance   contracts,   agreements,   and
arrangements between PAHC or PA Bank and any officer,  director,  consultant, or
other management official of any of them.

                                     - 25 -

<PAGE>


     6.38.  Material  Contract  Defaults.  All  contracts,  agreements,  leases,
mortgages, or commitments referred to in section 6.12(c) hereof are valid and in
full force and effect on the date hereof.  As of the date of this  Agreement and
as of the Effective  Time,  neither PAHC nor PA Bank is or will be in default in
any  material  respect  under  any  material  contract,  agreement,  commitment,
arrangement, lease, insurance policy, or other instrument to which it is a party
or by which its  assets,  business,  or  operations  may be bound or affected or
under which it or its assets,  business,  or operations  receive  benefits;  and
there has not  occurred  any event  that with the lapse of time or the giving of
notice or both would constitute such a default.

     6.39.  Capital  Expenditures.  Except as set forth on Schedule 6.39 hereof,
neither  PAHC  nor PA  Bank  has any  outstanding  commitments  to make  capital
expenditures which in the aggregate exceed $50,000.

     6.40.  Repurchase  Agreements.  With respect to all agreements  pursuant to
which  PAHC or PA Bank has  purchased  securities  subject  to an  agreement  to
resell,  it has a  valid,  perfected  first  lien or  security  interest  in the
securities securing the agreement, and the value of the collateral securing each
such  agreement  equals  or  exceeds  the  amount  of the debt  secured  by such
collateral under such agreement.

     6.41. Internal Controls; Year 2000 Problems.

          (a) Each of PAHC and PA Bank  maintains  internal  controls to provide
reasonable  assurance to its board of directors and officers that its assets are
safeguarded,  its  records  and reports  are  prepared  in  compliance  with all
applicable legal and accounting  requirements and with its internal policies and
practices,  and applicable  federal,  state,  and local laws and regulations are
complied  with.  These  controls  extend  to the  preparation  of its  financial
statements to provide  reasonable  assurance  that the  statements are presented
fairly in conformity with generally  accepted  accounting  principles or, in the
case of PA Bank and to the extent different from generally  accepted  accounting
principles,  accounting  principles  mandated by the OCC. The  controls  contain
self-monitoring  mechanisms,  and  appropriate  actions are taken on significant
deficiencies as they are identified.

          (b)  Each of PAHC  and PA Bank  has  reviewed  the  areas  within  its
business and operations which could be adversely  affected by, and has developed
or is  developing  a program to address on a timely  basis the risk that certain
computer  applications used by it or by any of its major suppliers may be unable
to recognize and perform properly date-sensitive functions involving dates prior
to and after  December  31, 1999 and prior to and after  February  28, 2000 (the
"Year  2000  Problem").  The  Year  2000  Problem  will not  result,  and is not
reasonably  expected to result,  in any  Material  Adverse  Effect on PAHC or PA
Bank.

     6.42.  Dividends.  Neither  PAHC nor PA Bank has paid any  dividend  to its
shareholders which caused its regulatory capital to be less than the amount then
required  by  applicable  law, or which  exceeded  any other  limitation  on the
payment of dividends imposed by law, agreement, or regulatory policy.

     6.43.  Brokers and  Advisers.  Except as set forth on Schedule 6.43 hereof,
(a) there are no claims for  brokerage  commissions,  finder's  fees, or similar
compensation  arising out of or due to any act of PAHC or PA Bank in  connection
with the transactions contemplated by this Agreement or based upon any agreement
or arrangement made by or on behalf of PAHC or PA Bank, and (b) neither PAHC nor
PA Bank has entered into any agreement or understanding  with any party relating
to financial  advisory  services  provided or to be provided with respect to the
transactions contemplated by this Agreement.

     6.44. Interest Rate Risk Management Instruments.

          (a) Schedule 6.44 contains a true,  correct,  and complete list of all
interest-rate   swaps,   caps,   floors,   and  options   agreements  and  other
interest-rate  risk management  arrangements to which PAHC or PA Bank is a party
or by which any of its properties or assets may be bound.

                                     - 26 -

<PAGE>


          (b) All interest rate swaps,  caps,  floors, and option agreements and
other interest rate risk  management  arrangements to which PAHC or PA Bank is a
party or by which any of its properties or assets may be bound were entered into
in the ordinary  course of its business  and, to the best of its  knowledge,  in
accordance with prudent banking practice and applicable rules, regulations,  and
regulatory  policies  and  with   counterparties   believed  to  be  financially
responsible  at  the  time  and  are  legal,   valid,  and  binding  obligations
enforceable  in  accordance  with  their  terms  (except  as may be  limited  by
bankruptcy,  insolvency,  moratorium,  reorganization, or similar laws affecting
the rights of creditors  generally and the availability of equitable  remedies),
and are in full force and effect.  PAHC and PA Bank have duly  performed  in all
material  respects  of all of their  respective  obligations  thereunder  to the
extent that such  obligations  to perform have  accrued;  and to the best of the
knowledge of PAHC and PA Bank, there are no breaches,  violations or defaults or
allegations or assertions of such by any party thereunder.

     6.45. Accounting Treatment.  PAHC is aware of no reason why the Merger will
fail to qualify for "pooling of interests" accounting treatment.

     6.46. COBRA Matters. Schedule 6.46 sets forth the name, address,  telephone
number,  social  security  number,  and date of Qualifying  Event (as defined in
section 603 of ERISA) of each individuals covered under a group health plan that
is subject to section  601 of ERISA and  sponsored  by PAHC or PA Bank or any of
their  subsidiaries  who have experienced a Qualifying Event since June 7, 1998,
together  with  documentation  of compliance by PAHC or PA Bank, as the case may
be, with applicable notice requirements.

     6.47.   Disclosure.   No  representation  or  warranty   hereunder  and  no
certificate, statement, or other document delivered by PAHC or PA Bank hereunder
or in connection  with this  Agreement or any of the  transactions  contemplated
thereunder  contains any untrue statement of a material fact or omits to state a
material fact necessary in order to make the  statements  contained  herein,  in
light of the circumstances under which they were made, not misleading.  There is
no fact known to PAHC which  reasonably  might have a Material Adverse Effect on
PAHC or PA Bank which has not been disclosed in the PAHC Financial Statements or
a  certificate  or other  document  delivered  to NBTB by PAHC.  All  copies  of
documents delivered to NBTB by PAHC under this Agreement are true, correct,  and
complete   copies  thereof  and  include  all   amendments,   supplements,   and
modifications thereto and all waivers thereunder.

     6.48.  Regulatory and Other Approvals.  As of the date hereof,  PAHC is not
aware of any  reason  why all  material  consents  and  approvals  shall  not be
procured from all regulatory  agencies having jurisdiction over the transactions
contemplated  by this Agreement,  as shall be necessary for (a)  consummation of
the transactions  contemplated by this Agreement, and (b) the continuation after
the  Effective  Time of the  business  of PAHC and PA Bank as such  business  is
carried on immediately  prior to the Effective  Time,  free of any conditions or
requirements  which,  in the reasonable  opinion of PAHC,  could have a Material
Adverse  Effect on PAHC. As of the date hereof,  PAHC is not aware of any reason
why all material  consents and  approvals  shall not be procured  from all other
persons and  entities  whose  consent or  approval  shall be  necessary  for (y)
consummation of the  transactions  contemplated  by this  Agreement,  or (z) the
continuation  after the  Effective  Time of the  business of PAHC and PA Bank as
such business is carried on immediately prior to the Effective Time.

7.   COVENANTS OF PAHC.

     PAHC covenants and agrees as follows:

     7.1.  Rights of Access.  In  addition  and not in  limitation  of any other
rights of access  provided to NBTB herein,  until the Effective Time PAHC and PA
Bank  will  give to NBTB and to its  representatives,  including  its  certified
public accountants, KPMG, full access during normal business hours to all of the
property, documents,

                                     - 27 -

<PAGE>


contracts,  books,  and records of PAHC and PA Bank, and such  information  with
respect to their  business  affairs and properties as NBTB from time to time may
reasonably request.

     7.2. Monthly and Quarterly  Financial  Statements;  Minutes of Meetings and
Other Materials.

          (a) PAHC and PA Bank will  continue  to prepare all of the monthly and
quarterly financial  statements and financial reports to regulatory  authorities
for the months and  quarterly  periods  ending  between  October 1, 1999 and the
Effective Time which it customarily  prepared  during the period between January
1, 1996 and  September 30, 1999 and shall  promptly  provide NBTB with copies of
all such financial  statements and reports. All of such financial statements and
reports, including the related notes, schedules, and memorandum items, will have
been  prepared in  accordance  with  generally  accepted  accounting  principles
consistently  applied in all material  respects (except that Call Reports may be
prepared in accordance with the official instructions  applicable thereto at the
time of filing).

          (b) PAHC and PA Bank shall  promptly  provide  NBTB with (i) copies of
all of its periodic  reports to directors  and to  shareholders,  whether or not
such reports were prepared or  distributed  in connection  with a meeting of the
board of directors  or a meeting of the  shareholders,  prepared or  distributed
between the date of this  Agreement  and the Effective  Time,  and (ii) complete
copies of all  minutes of meetings of its board of  directors  and  shareholders
which  meetings take place between the date of this  Agreement and the Effective
Time,  certified  by the  secretary  or cashier  or an  assistant  secretary  or
assistant cashier of PAHC or PA Bank, as the case may be.

          (c) From the date of this Agreement to the Effective Time, PAHC shall,
contemporaneously with its filing with the SEC of any periodic or current report
pursuant  to section 13 of the  Exchange  Act,  deliver a copy of such report to
NBTB.

     7.3. Extraordinary Transactions. Without the prior written consent of NBTB,
neither  PAHC nor PA Bank  will,  on or after  the date of this  Agreement:  (a)
subject to section 7.9, declare or pay any cash dividends or property  dividends
with  respect  to any class of its  capital  stock,  with the  exception  of (i)
subject  to  the  dividend-coordination   provisions  of  section  7.9  of  this
Agreement,  customary  periodic  cash  dividends  paid by PAHC to holders of its
common stock in amounts not exceeding  $0.20 per share per calendar  quarter and
at intervals  that are not shorter than past  practice,  and (ii) customary cash
dividends  paid by PA Bank whose  amounts have not exceeded past practice and at
intervals that are not shorter than past practice; (b) declare or distribute any
stock  dividend,  authorize  a stock  split,  or  authorize,  issue  or make any
distribution of its capital stock or any other securities  (except for issuances
of PAHC Common Stock upon exercise of stock options  outstanding  on the date of
this Agreement), or grant any options to acquire such additional securities; (c)
either (i) merge into,  consolidate  with,  or sell or otherwise  dispose of its
assets to any other  corporation or person,  or enter into any other transaction
or agree to  effect  any other  transaction  not in the  ordinary  course of its
business  except  as  explicitly  contemplated  herein,  or (ii)  engage  in any
discussions   concerning  such  a  possible  transaction  except  as  explicitly
contemplated herein unless the board of directors of PAHC, based upon the advice
of Blank Rome Comisky & McCauley LLP,  determines in good faith that such action
is required for the board of directors  to comply with its  fiduciary  duties to
stockholders  imposed by law;  (d)  convert  the charter or form of entity of PA
Bank from that in existence on the date of this  Agreement to any other  charter
or form of entity;  (e) make any direct or  indirect  redemption,  purchase,  or
other acquisition of any of its capital stock; (f) except in the ordinary course
of  its  business  or  to  accomplish  the  transactions  contemplated  by  this
Agreement,   incur  any  liability  or   obligation,   make  any  commitment  or
disbursement,  acquire or dispose of any property or asset, make any contract or
agreement,   pay  or  become  obligated  to  pay  any  legal,   accounting,   or
miscellaneous other expense, or engage in any transaction; (g) other than in the
ordinary  course of  business,  subject any of its  properties  or assets to any
lien, claim, charge, option, or encumbrance; (h) enter into or assume any one or
more commitments to make capital expenditures, any of which individually exceeds
$20,000 or which in the aggregate  exceed  $50,000;  (i) except for increases in
the  ordinary  course of  business  in  accordance  with past  practices,  which
together with all other  compensation  rate  increases do not exceed 4.5 percent
per annum of the

                                     - 28 -

<PAGE>


aggregate   payroll  as  of  September  30,  1999,   and  except  as  explicitly
contemplated  by  this  Agreement,  increase  the  rate of  compensation  of any
employee or enter into any agreement to increase the rate of compensation of any
employee;  (j) except as otherwise required by law, create or modify any pension
or  profit  sharing  plan,  bonus,  deferred  compensation,  death  benefit,  or
retirement  plan, or the level of benefits  under any such plan, nor increase or
decrease any severance or termination  pay benefit or any other fringe  benefit;
(k) enter into any employment or personal  services  contract with any person or
firm,  including  without  limitation  any contract,  agreement,  or arrangement
described  in  section  6.37(a)  hereof,   except  directly  to  facilitate  the
transactions  contemplated  by this  Agreement;  nor (l)  purchase  any loans or
loan-participation  interests  from, or participate in any loans  originated by,
any person other than PAHC or PA Bank.

     7.4.  Preservation of Business.  Each of PAHC and PA Bank will (a) carry on
its business and manage its assets and properties  diligently and  substantially
in the same manner as  heretofore;  (b)  maintain  the ratio of its loans to its
deposits at  approximately  the same level as existed at September  30, 1999, as
adjusted to allow for seasonal  fluctuations of loans and deposits of a kind and
amount experienced  traditionally by it; (c) manage its investment  portfolio in
substantially  the same manner and pursuant to substantially the same investment
policies as in 1997 and 1998,  and will take no action to change to any material
extent the percentage which its investment  portfolio bears to its total assets,
or to lengthen to any  material  extent the average  maturity of its  investment
portfolio,  or  of  any  significant  category  thereof;  (d)  use  commercially
reasonable  efforts to continue in effect its present insurance  coverage on all
properties,  assets,  business, and personnel;  (e) use commercially  reasonable
efforts to preserve its business  organization  intact,  to keep  available  its
present employees,  and to preserve its present relationships with customers and
others having business  dealings with it; (f) not do anything and not fail to do
anything  which will cause a breach of or  default in any  contract,  agreement,
commitment,  or  obligation  to which it is a party or by which it may be bound;
(g)  conduct  its   affairs  so  that  at  the   Effective   Time  none  of  its
representations  and warranties  will be  inaccurate,  none of its covenants and
agreements  will be breached,  and no condition  in this  Agreement  will remain
unfulfilled  by  reason  of its  actions  or  omissions;  and (h) not  amend its
articles of incorporation or bylaws.

     7.5. Comfort Letter.  At the time of the  effectiveness of the Registration
Statement,  but prior to the  mailing of the Joint Proxy  Statement,  and on the
date of the Effective Time, PAHC shall furnish NBTB with a letter from KPMG LLP,
in its  capacity  as the  independent  auditors of PAHC,  in form and  substance
acceptable  to NBTB,  stating  that (a) they are  independent  accountants  with
respect to PAHC within the meaning of the Securities Act and the published rules
and  regulations  thereunder,  (b) in their opinion the  consolidated  financial
statements of PAHC included in the  Registration  Statement comply as to form in
all  material  respects  with  the  applicable  accounting  requirements  of the
Securities Act and the published  rules and  regulations  thereunder,  and (c) a
reading of the latest available unaudited  consolidated  financial statements of
PAHC and  unaudited  financial  statements  of PA Bank and  inquiries of certain
officials of PAHC and PA Bank  responsible for financial and accounting  matters
as to  transactions  and events  since the date of the most recent  consolidated
statement of  condition  included in their most recent audit report with respect
to PAHC did not cause them to believe that (i) such latest  available  unaudited
consolidated  financial  statements of PAHC are not stated on a basis consistent
with that followed in PAHC's audited consolidated financial statements;  or (ii)
except  as  disclosed  in the  letter,  at a  specified  date not more than five
business  days prior to the date of such letter,  there was any change in PAHC's
capital stock or any change in  consolidated  long-term  debt or any decrease in
the consolidated  net assets of PAHC or the consolidated  allowance for loan and
lease losses of PAHC as compared with the  respective  amounts shown in the most
recent PAHC audited  consolidated  financial  statements.  The letter shall also
cover such other matters  pertaining to PAHC's and PA Bank's  financial data and
statistical information included in the Registration Statement as may reasonably
be requested by NBTB.

     7.6. Affiliates' Agreements.

          (a) PAHC will furnish to NBTB (i) a list of all persons  known to PAHC
who at the date of this  Agreement and (ii) if different  from the list required
by section 7.6(a)(i), a list of all persons known to PAHC

                                     - 29 -

<PAGE>


who at the date of  PAHC's  special  meeting  of  shareholders  to vote upon the
transactions  contemplated by this Agreement may be deemed to be "affiliates" of
PAHC within the meaning of Rule 145 under the Securities Act and for purposes of
qualifying the Merger for "pooling of interests" accounting treatment.

          (b) PAHC will use commercially  reasonable  efforts to cause each such
"affiliate"  of PAHC to deliver to NBTB on or before the date of this  Agreement
(or, in the case of any person who becomes an "affiliate" of PAHC after the date
of this  Agreement,  not  later  than ten days  after  such  person  becomes  an
"affiliate" of PAHC) an Affiliates Agreement.

     7.7. Pooling Treatment.

          (a) PAHC will take no action  that would  prevent or impede the Merger
from  qualifying  for "pooling of interests"  accounting  treatment or KPMG from
delivering the Pooling Letters.

          (b) PAHC shall deliver to KPMG such certificates or representations as
KPMG may reasonably request to enable it to deliver the Pooling Letters.

     7.8.  Shareholders'  Meeting. PAHC shall hold a meeting of its shareholders
in accordance  with the BCL as promptly as possible after the  effectiveness  of
the  Registration  Statement,  after at least twenty days' prior written  notice
thereof to the  shareholders  of PAHC, to consider and vote upon the adoption of
this  Agreement.  Subject to its fiduciary  duty to  shareholders,  the board of
directors of PAHC shall approve this Agreement and recommend to its shareholders
that it be adopted.

     7.9. Dividend Coordination.  After the date of this Agreement, each of NBTB
and PAHC shall  coordinate  with the other the  declaration  of any dividends in
respect of NBTB  Common  Stock and PAHC  Common  Stock and the record  dates and
payment dates  relating  thereto,  it being the intention of the parties  hereto
that  holders of PAHC Common Stock shall not receive two  dividends,  or fail to
receive one  dividend,  for any  quarter  with  respect to their  shares of PAHC
Common  Stock and any shares of NBTB Common  Stock any such  holder  receives in
exchange therefor in the Merger.

     7.10. Inconsistent Activities.

          (a) Subject to subsection  (b) of this section 7.10,  unless and until
the  Merger  has been  consummated  or this  Agreement  has been  terminated  in
accordance  with its  terms,  neither  PAHC  nor PA Bank  will  (a)  solicit  or
encourage,   directly  or  indirectly,  any  inquiries  or  proposals  (each  an
"Alternative  Proposal") to acquire more than 1 percent of the PAHC Common Stock
or any  capital  stock of PA Bank or any  significant  portion  of the assets of
either of them (whether by tender offer,  merger,  purchase of assets,  or other
transactions  of any type) (each an "Alternative  Transaction");  (b) afford any
third party which may be  considering  an  Alternative  Proposal or  Alternative
Transaction  access to its  properties,  books or records  except as required by
mandatory provisions of law; (c) enter into any discussions or negotiations for,
or enter into any agreement or understanding which provides for, any Alternative
Transaction,  or  (d)  authorize  or  permit  any of  its  directors,  officers,
employees  or agents to do or permit  any of the  foregoing.  If PAHC or PA Bank
becomes  aware of any  Alternative  Proposal or of any other  matter which could
adversely  affect  this  Agreement  or  the  Merger,  PAHC  and  PA  Bank  shall
immediately give notice thereof to NBTB.

          (b) Nothing  contained  in  subsection  (a) of this section 7.10 shall
prohibit  the board of  directors  of PAHC  from  furnishing  information  to or
entering  into  discussions  or  negotiations  with  any  person  that  makes an
unsolicited bona fide Alternative  Proposal if, and only to the extent that, (i)
the board of  directors  of the  Company,  based  upon the  advice of Blank Rome
Comisky & McCauley  LLP,  determines  in good faith that such action is required
for the board of directors to comply with its fiduciary  duties to  stockholders
imposed by law, (ii)

                                     - 30 -

<PAGE>


prior to  furnishing  such  information  to, or  entering  into  discussions  or
negotiations  with,  such person,  PAHC provides  written  notice to NBTB to the
effect that it is furnishing  information  to, or entering into  discussions  or
negotiations with, such person, and (iii) PAHC keeps NBTB informed of the status
and  all  material   information   with  respect  to  any  such  discussions  or
negotiations.

          (c) Nothing in  subsection  (b) of this section 7.10 or in  subsection
(c) of section 7.3 of this  Agreement  shall (i) permit PAHC to  terminate  this
Agreement  (except as  specifically  provided  in  section  11.1 or 11.2 of this
Agreement), (ii) permit PAHC or PA Bank to enter into any agreement with respect
to an Alternative  Transaction  for as long as this Agreement  remains in effect
(it being agreed that for as long as this Agreement remains in effect,  PAHC and
PA Bank shall not enter into any agreement with any person that provides for, or
in any way facilitates, an Alternative Transaction (other than a confidentiality
agreement in customary  form)),  or (iii) affect any other obligation of PAHC or
PA Bank under this Agreement.

     7.11. COBRA Obligations.  For all individuals  covered under a group health
plan that is subject to section 601 of ERISA and sponsored by PAHC or PA Bank or
any of their subsidiaries,  and who experience a Qualifying Event (as defined in
section 603 of ERISA) within thirty days of the date of this Agreement,  PAHC or
PA Bank, as the case may be, shall remain  responsible for providing all notices
and election  forms  necessary to comply with ERISA and the Code,  and will take
all steps necessary to implement elections pursuant to such notices.

     7.12. Updated  Schedules.  Not less than fifteen business days prior to the
Effective  Time and as of the  Effective  Time,  PAHC will  deliver  to NBTB any
updates  to the  schedules  to its  representations  which  may be  required  to
disclose events or circumstances  arising after the date hereof.  Such schedules
shall  be  updated  only for the  purpose  of  making  the  representations  and
warranties  contained  in this  Agreement  to which such part of such  schedules
relate true and correct in all material respects as of the date such schedule is
updated,  and the  updated  schedule  shall not have the  effect  of making  any
representation  or warranty  contained in this Agreement true and correct in all
material respects as of a date prior to the date of such updated  schedule.  For
purposes of determining whether the condition set forth in section 4.1 to NBTB's
obligations have been met, any such updated schedules delivered to NBTB shall be
disregarded  unless NBTB shall have agreed to accept any  changes  reflected  in
such updated schedules.

     7.13.  Subsequent  Events.  Until the Effective Time, PAHC will immediately
advise  NBTB in a  detailed  written  notice  of any fact or  occurrence  or any
pending or  threatened  occurrence  of which it obtains  knowledge and which (if
existing and known at the date of the  execution of this  Agreement)  would have
been  required to be set forth or  disclosed  in or  pursuant to this  Agreement
which (if  existing  and known at any time  prior to or at the  Effective  Time)
would make the  performance  by PAHC of a covenant  contained in this  Agreement
impossible  or make  such  performance  materially  more  difficult  than in the
absence of such fact or occurrence,  or which (if existing and known at the time
of the Effective Time) would cause a condition to NBTB's  obligations under this
Agreement not to be fully satisfied.

8.   REPRESENTATIONS AND WARRANTIES OF NBTB.

     NBTB represents and warrants to PAHC as follows:

     8.1. Organization,  Powers, and Qualification.  NBTB is a corporation which
is duly organized,  validly existing, and in good standing under the laws of its
jurisdiction  of  incorporation  and  has  all  requisite  corporate  power  and
authority to own and operate its properties and assets, to lease properties used
in its  business,  and to carry on its business as now  conducted.  NBTB owns or
possesses in the operation of its business all  franchises,  licenses,  permits,
branch certificates,  consents,  approvals,  waivers, and other  authorizations,
governmental or otherwise, which are necessary for it to conduct its business as
now conducted, except for those where the failure of such

                                     - 31 -

<PAGE>


ownership or possession  would not have a Material  Adverse Effect on NBTB. NBTB
is duly  qualified  and licensed to do business and is in good standing in every
jurisdiction  with  respect to which the failure to be so  qualified or licensed
could result in a Material Adverse Effect on NBTB.

     8.2.  Execution and  Performance  of Agreement.  Provided that prior to the
Effective Time the shareholders of NBTB approve the Share Increase Amendment and
an appropriate  Certificate of Amendment is filed with the Delaware Secretary of
State  reflecting  such  approval,  NBTB has all requisite  corporate  power and
authority to execute and deliver this  Agreement  and to perform its  respective
terms.

     8.3. Binding Obligations; Due Authorization. This Agreement constitutes the
valid,  legal,  and  binding  obligations  of  NBTB  enforceable  against  it in
accordance  with its terms,  except as enforcement  may be limited by applicable
bankruptcy,  insolvency,  moratorium or similar law, or by general principles of
equity.  The  execution,  delivery,  and  performance  of this Agreement and the
transactions  contemplated  thereby have been duly and validly authorized by the
board of  directors  of NBTB.  No other  corporate  proceedings  on its part are
necessary to authorize  this  Agreement or the carrying out of the  transactions
contemplated hereby.

     8.4.  Absence of Default.  Provided  that prior to the  Effective  Time the
shareholders  of NBTB approve the Share  Increase  Amendment and an  appropriate
Certificate  of  Amendment  is  filed  with  the  Delaware  Secretary  of  State
reflecting  such  approval,  none  of the  execution  or the  delivery  of  this
Agreement,  the consummation of the  transactions  contemplated  hereby,  or the
compliance with or fulfillment of the terms hereof will conflict with, or result
in a breach of any of the terms,  conditions,  or provisions of, or constitute a
default  under the  organizational  documents  or  bylaws of NBTB.  None of such
execution,  consummation,  or fulfillment will (a) conflict with, or result in a
material  breach of the terms,  conditions,  or  provisions  of, or constitute a
material  violation,  conflict,  or default under,  or give rise to any right of
termination,  cancellation,  or  acceleration  with respect to, or result in the
creation of any lien, charge, or encumbrance upon, any of the property or assets
of NBTB  pursuant to any  material  agreement  or  instrument  under which it is
obligated or by which any of its  properties  or assets may be bound,  including
without limitation any material lease, contract, mortgage, promissory note, deed
of trust,  loan, credit  arrangement or other commitment or arrangement of it in
respect of which it is an obligor, or (b) if the Merger is approved by the Board
of  Governors  under  the BHC Act,  or if the  Board  of  Governors  waives  its
jurisdiction over the Holding Company Merger, and if the Bank Merger is approved
by the OCC, and if the transactions  contemplated by this Agreement are approved
by the  Department,  violate  any  law,  statute,  rule,  or  regulation  of any
government  or agency to which  NBTB is  subject  and which is  material  to its
operations,  or (c) violate any judgment,  order, writ,  injunction,  decree, or
ruling to which it or any of its properties or assets is subject or bound.  None
of the  execution  or  delivery  of  this  Agreement,  the  consummation  of the
transactions  contemplated  hereby, or the compliance with or fulfillment of the
terms hereof will require any authorization,  consent, approval, or exemption by
any person  which has not been  obtained,  or any notice or filing which has not
been given or done,  other than  approval of the transac tions  contemplated  by
this  Agreement by,  notices to, or filings with by the Board of Governors,  the
OCC, the SEC, state  securities  commissions,  the Department,  the Secretary of
State of the State of Delaware,  and the Secretary of State of the  Commonwealth
of Pennsylvania.

     8.5. Capital Structure.

          (a) The  authorized  capital  stock  of  NBTB  as of the  date of this
Agreement  consists of (i) 2,500,000  shares of preferred  stock,  no par value,
stated value $1.00 per share ("NBTB Preferred Stock"),  of which, as of the date
of this  Agreement,  no shares are issued or  outstanding,  and (ii)  15,000,000
shares  of NBTB  Common  Stock,  of  which,  as of the  date of this  Agreement,
12,440,384  shares have been duly issued and are validly  outstanding  and fully
paid,  and 575,  405  additional  shares are issued and held in the  treasury of
NBTB. The  aforementioned  shares of NBTB Preferred  Stock and NBTB Common Stock
are the only voting securities of NBTB authorized,  issued, or outstanding as of
such date.

                                     - 32 -

<PAGE>


          (b)  None of the  shares  of NBTB  Common  Stock  has been  issued  in
violation of the preemptive rights of any shareholder.

          (c) As of the date hereof,  to the best of the knowledge of NBTB,  and
except  for  this  Agreement,  there  are no  shareholder  agreements,  or other
agreements,  understandings,  or commitments relating to the right of any holder
or beneficial owner of more than 1 percent of the issued and outstanding  shares
of any class of the capital  stock of NBTB to vote or to dispose of his,  her or
its shares of capital stock of NBTB.

     8.6. Books and Records.  The books and records of each of NBTB and NBT Bank
fairly  reflect  the  transactions  to  which  it is a  party  or by  which  its
properties are subject or bound.  Such books and records have been properly kept
and  maintained  and  are  in  compliance  in all  material  respects  with  all
applicable accounting and legal requirements.  Each of NBTB and NBT Bank follows
generally  accepted  accounting  principles applied on a consistent basis in the
preparation  and  maintenance of its books of account and financial  statements,
including but not limited to the application of the accrual method of accounting
for interest  income on loans,  leases,  discounts,  and  investments,  interest
expense on deposits and all other liabilities, and all other items of income and
expense.  Each of NBTB  and NBT Bank has made  all  accruals  in  amounts  which
accurately  report income and expense in the proper  periods in accordance  with
generally accepted  accounting  principles.  Each of NBTB and NBT Bank has filed
all material  reports and returns  required by any law or regulation to be filed
by it.

     8.7.  Financial  Statements.  NBTB has  furnished to PAHC its  consolidated
audited  statement of  condition  as of each of December 31, 1996,  December 31,
1997, and December 31, 1998, and its related audited  consolidated  statement of
income,  consolidated  statement of cash flows,  and  consolidated  statement of
changes in  stockholders'  equity for each of the periods  then  ended,  and the
notes  thereto,  and its  consolidated  unaudited  statement  of condition as of
September 30, 1999, and its related unaudited  consolidated statement of income,
consolidated state ment of cash flows, and consolidated  statement of changes in
stockholders'  equity for the period then ended, and the notes thereto,  each as
filed with the SEC (collectively,  the "NBTB Financial Statements").  All of the
NBTB Financial Statements,  including the related notes, (a) except as indicated
in the notes  thereto,  were  prepared in  accordance  with  generally  accepted
accounting principles consistently applied in all material respects (subject, in
the case of unaudited  statements,  to  recurring  audit  adjustments  normal in
nature and  amount),  and (b) are in  accordance  with the books and  records of
NBTB, (c) fairly reflect the consolidated  financial position of NBTB as of such
dates, and the consolidated  results of operations of NBTB for the periods ended
on such  dates,  and do not  fail to  disclose  any  material  extraordinary  or
out-of-period  items,  and (d) reflect,  in accordance  with generally  accepted
accounting  principles  consistently applied in all material respects,  adequate
provision for, or reserves  against,  the consolidated loan losses of NBTB as of
such dates.

     8.8.  Nasdaq  Reporting.  Trading of NBTB  Common  Stock is reported on the
Nasdaq National Market.

     8.9. Absence of Certain  Developments.  Since September 30, 1999, there has
been (a) no Material  Adverse  Effect with respect to NBTB,  and (b) no material
deterioration  in the  quality  of the loan  portfolio  of NBTB or of any  major
component thereof, and no material increase in the level of nonperforming assets
or  nonaccrual  loans at NBTB or in the level of its provision for credit losses
or its reserve for credit losses.

     8.10. Brokers and Advisers.  Other than with respect to MB&D, (a) there are
no claims for brokerage  commissions,  finder's  fees,  or similar  compensation
arising  out of or due to any act of NBTB in  connection  with the  transactions
contemplated  by this Agreement or based upon any agreement or arrangement  made
by or on behalf of NBTB,  and (b) NBTB has not  entered  into any  agreement  or
understanding with any party relating to financial advisory services provided or
to be provided with respect to the transactions contemplated by this Agreement.

     8.11.   Disclosure.   No  representation  or  warranty   hereunder  and  no
certificate,  statement,  or other  document  delivered by NBTB  hereunder or in
connection with this Agreement or any of the transactions contemplated

                                     - 33 -

<PAGE>


thereunder  contains any untrue statement of a material fact or omits to state a
material fact necessary in order to make the  statements  contained  herein,  in
light of the circumstances under which they were made, not misleading.  There is
no fact known to NBTB which  might  materially  adversely  affect its  business,
assets,  liabilities,  financial condition,  results of operations, or prospects
which has not been disclosed in the NBTB  Financial  Statements or a certificate
or other document  delivered by NBTB to PAHC. Copies of all documents  delivered
to PAHC by NBTB under this  Agreement  are true,  correct,  and complete  copies
thereof and include all amendments,  supplements,  and modifications thereto and
all waivers thereunder.

     8.12.  Regulatory and Other Approvals.  As of the date hereof,  NBTB is not
aware of any  reason  why all  material  consents  and  approvals  shall  not be
procured from all regulatory  agencies having jurisdiction over the transactions
contemplated  by this Agreement,  as shall be necessary for (a)  consummation of
the transactions  contemplated by this Agreement, and (b) the continuation after
the  Effective  Time of the  business  of NBTB as such  business  is  carried on
immediately  prior to the Effective Time, free of any conditions or requirements
which, in the reasonable  opinion of NBTB,  could have a Material Adverse Effect
on NBTB. As of the date hereof, NBTB is not aware of any reason why all material
consents and approvals shall not be procured from all other persons and entities
whose  consent  or  approval  shall be  necessary  for (y)  consummation  of the
transactions  contemplated by this Agreement,  or (z) the continuation after the
Effective  Time  of the  business  of  NBTB  as  such  business  is  carried  on
immediately prior to the Effective Time.

9.   COVENANTS OF NBTB.

     NBTB covenants and agrees as follows:

     9.1.  Rights of Access.  From the date hereof to the Effective  Time,  NBTB
shall give to PAHC and to its  representatives,  including its certified  public
accountants,  KPMG LLP, full access during normal  business  hours to all of the
property, documents, contracts, books, and records of NBTB, and such information
with respect to their business  affairs and properties as PAHC from time to time
may reasonably request.

     9.2. Securities  Reports.  From the date hereof to the Effective Time, NBTB
shall, contemporaneously with the filing with the SEC of any periodic or current
report pursuant to section 13 of the Exchange Act, deliver a copy of such report
to PAHC.

     9.3.  Shareholders'  Meeting. NBTB shall hold a meeting of its shareholders
in accordance  with the GCL as promptly as possible after the  effectiveness  of
the  Registration  Statement,  after at least twenty days' prior written  notice
thereof to the  shareholders  of NBTB, to consider and vote upon this Agreement,
it being agreed,  however,  that nothing in this Agreement shall require NBTB to
hold a special meeting of its shareholders within the thirty-day period prior to
its 2000 annual meeting of shareholders  if NBTB proposes for the  consideration
of its  shareholders  at such annual meeting that the issuance of shares of NBTB
Common Stock  pursuant to this  Agreement be approved and that this Agreement be
ratified. Subject to its fiduciary duty to shareholders,  the board of directors
of NBTB shall recommend to its shareholders  that the issuance of shares of NBTB
Common Stock  pursuant to this  Agreement be approved and that this Agreement be
ratified.

     9.4. Nasdaq Approval. NBTB shall use its commercially reasonable efforts to
cause the shares of NBTB Common  Stock to be issued in the Merger to be approved
for  inclusion  on the Nasdaq  National  Market,  subject to official  notice of
issuance, prior to the Effective Time.

     9.5.  Options.  At or prior to the  Effective  Time,  NBTB  shall  take all
corporate action necessary to reserve for issuance a sufficient number of shares
of NBTB Common  Stock for  delivery  upon  exercise of options to purchase  PAHC
Common Stock  assumed by it in accordance  with section 1.11 hereof.  NBTB shall
use commercially

                                     - 34 -

<PAGE>


reasonable  efforts to maintain the effectiveness of the registration  statement
that  pertains to the shares  subject to such options (and  maintain the current
status of the prospectus or prospectuses  contained therein) for so long as such
options  remain  outstanding.  NBTB shall at and after the  Effective  Time have
reserved  sufficient  shares of NBTB Common Stock for  issuance  with respect to
such  options.  NBTB shall also take any action  required  to be taken under any
applicable  state blue sky or securities laws in connection with the issuance of
such shares.

     9.6.  Indemnification  of Directors and  Officers.  Following the Effective
Time NBTB will take no action to abrogate or diminish any right  accorded  under
the articles of  incorporation  or by-laws of PAHC as they  existed  immediately
prior to the  Effective  Time to any person  who,  on or prior to the  Effective
Time,  was a  director  or officer  of PAHC to  indemnification  from or against
losses,  expenses,  claims, demands,  damages,  liabilities,  judg ments, fines,
penalties,  costs,  expenses (including without limitation  reasonable attorneys
fees) and amounts paid in  settlement  pertaining  to or incurred in  connection
with any threatened or actual action, suit, claim, or proceeding (whether civil,
criminal, administrative,  arbitration, or investigative) arising out of events,
matters,  actions,  or omissions occurring on or prior to the Effective Time. To
the extent not provided by the  foregoing,  following the Effective  Time and to
the extent permitted by law, all rights to such  indemnification  accorded under
the articles of incorporation and by-laws of PAHC to any person who, on or prior
to the  Effective  Time,  was a director  or officer of PAHC shall  survive  the
Effective Time and,  following the Merger,  to the extent permitted by law, NBTB
will honor such  obligations  in  accordance  with their  terms with  respect to
events, acts, or omissions occurring prior to the Effective Time.

     9.7.  Subsequent  Events.  Until the Effective Time, NBTB will  immediately
advise  PAHC in a  detailed  written  notice  of any fact or  occurrence  or any
pending or  threatened  occurrence  of which it obtains  knowledge and which (if
existing and known at the date of the  execution of this  Agreement)  would have
been  required to be set forth or  disclosed  in or  pursuant to this  Agreement
which (if  existing  and known at any time  prior to or at the  Effective  Time)
would make the  performance  by NBTB of a covenant  contained in this  Agreement
impossible  or make  such  performance  materially  more  difficult  than in the
absence of such fact or occurrence,  or which (if existing and known at the time
of the Effective Time) would cause a condition to PAHC's  obligations under this
Agreement not to be fully satisfied.

10.  CLOSING.

     10.1. Place and Time of Closing.  Closing shall take place at the principal
executive  offices  of  NBTB or at  such  other  place  as the  parties  choose,
commencing at 9:00 a.m., local time, on the date of the Effective Time, provided
that all conditions  precedent to the obligations of the parties hereto to close
have then been met or waived.

     10.2.  Events To Take  Place at  Closing.  At the  Closing,  the  following
actions will be taken:

          (a) Such  certificates  and other  documents  as are  required by this
Agreement to be executed and  delivered  at or prior to the  Effective  Time and
have  not been so  executed  and  delivered,  and such  other  certificates  and
documents as are mutually  deemed by the parties to be otherwise  desirable  for
the effectuation of the Closing, will be so executed and delivered; and then

          (b) the First Merger and the issuance of shares incident thereto shall
be effected;  provided, however, that the administrative and ministerial aspects
of the  issuance  of shares  incident  to the  Merger  will be  settled  as soon
thereafter as shall be reasonable under the circumstances; and then

          (c) the Second Merger and the Bank Merger shall be effected.


                                     - 35 -

<PAGE>


11.  TERMINATION, DAMAGES FOR BREACH, WAIVER, AND AMENDMENT.

     11.1.  Termination  by  Reason  of  Lapse of Time.  This  Agreement  may be
terminated by any party on or after July 31, 2000, by instrument duly authorized
and executed and delivered to the other  parties,  unless (a) the Effective Time
shall have  occurred on or before such date or (b) the failure of the  Effective
Time to have  occurred on or before such date has been due to the failure of the
party  seeking to terminate  this  Agreement to perform or observe its covenants
and agreements as set forth herein.

     11.2. Grounds for Termination.  This Agreement may be terminated by written
notice of termination  at any time before the Effective Time (whether  before or
after action by shareholders of PAHC or NBTB):

          (a) by mutual consent of the parties hereto;

          (b) by NBTB,  upon written notice to PAHC given at any time (i) if any
of the  representations and warranties of PAHC contained in section 6 hereof was
materially  incorrect  when made,  or (ii) in the event of a material  breach or
material  failure by PAHC of any covenant or agreement of PAHC contained in this
Agreement  which has not been,  or cannot be,  cured  within  thirty  days after
written notice of such breach or failure is given to PAHC, and which inaccuracy,
breach,  or failure,  if continued to the  Effective  Time,  would result in any
condition set forth in section 4 hereof not being satisfied;

          (c) by PAHC,  upon written notice to NBTB given at any time (i) if any
of the  representations and warranties of NBTB contained in section 8 hereof was
materially  incorrect  when made,  or (ii) in the event of a material  breach or
material  failure by NBTB of any covenant or agreement of NBTB contained in this
Agreement  which has not been,  or cannot be,  cured  within  thirty  days after
written notice of such breach or failure is given to NBTB, and which inaccuracy,
breach,  or failure,  if continued to the  Effective  Time,  would result in any
condition  set forth in  section 4 hereof  not being  satisfied  or (iii) if the
board of  directors  of PAHC,  based  upon the  advice of Blank  Rome  Comisky &
McCauley LLP, determines in good faith that such termination is required for the
board of directors to comply with its fiduciary  duties to stockholders  imposed
by law by reason of an Alternative Proposal being made; provided that PAHC shall
notify NBTB promptly of its intention to terminate  this Agreement or enter into
a definitive agreement with respect to any Alternative Proposal, but in no event
shall such notice be given less than 48 hours  prior to the public  announcement
of PAHC's termination of this Agreement;

          (d) by PAHC, in accordance with the following provisions:

               (i) at any time during the three-business-day period beginning on
the  Determination  Date, if both of the  following  conditions  are  satisfied,
subject, however, to subsection 11.2(d)(ii):

                    (A) The Average Closing Price is less than $15.00; and

                    (B) The  number,  expressed  as a  percentage,  obtained  by
dividing the Average  Closing Price by $16.75 is more than 15 percentage  points
less than the Index Differential.

               (ii) If PAHC  chooses  to  exercise  its right  pursuant  to this
section 11.2(d),  it shall give immediate written notice thereof to NBTB. During
the three-business-day period commencing with receipt of such notice, NBTB shall
have the option to agree that the  Exchange  Ratio shall be 1.805  times  $15.00
divided  by  the  Average   Closing  Price.   If  NBTB  so  elects  within  such
three-business-day  period,  it shall give  immediate  written notice thereof to
PAHC,  whereupon no  termination  shall have  occurred  pursuant to this section
11.2(d) and this Agreement  shall remain in effect in accordance  with its terms
(except  that the  Exchange  Ratio  shall be 1.805 times  $15.00  divided by the
Average Closing Price).

                                     - 36 -

<PAGE>


               (iii)  Definitions.  The  following  terms  used in this  section
11.2(d) shall have the meanings set forth in this Subparagraph (iii).

                    (A)  Determination  Date. The seventh business day preceding
the Effective Time.

                    (B) Index  Price.  For any  member of the Index  Group,  the
Average Closing Price calculated using, instead of NBTB Common Stock, the common
stock of that member of the Index Group.

                    (C) Index  Differential.  The sum of the respective  numbers
(expressed as percentages), for each of the members of the Index Group, obtained
by multiplying the weighting (as set forth in section  11.2(d)(iii)(D))  of that
member of the Index Group times the  quotient of the Index Price for that member
of the  Index  Group  divided  by the  Base  Price  (as  set  forth  in  section
11.2(d)(iii)(D)) for that member of the Index Group.

                    (D) Index Group.  The twenty  companies  listed  below,  the
common  stock of all of which  shall be  publicly  traded and as to which  there
shall not have been a publicly  announced  proposal  between  the day before the
date of the execution of this Agreement and the Determination  Date for any such
company to be  Acquired.  In the event that the common stock of any such company
ceases to be publicly  traded or a proposal to Acquire that company is announced
between  the day  before the date of the  execution  of this  Agreement  and the
Determination  Date, such company will be removed from the Index Group,  and the
weights attributed to the remaining  companies will be adjusted  proportionately
for  purposes of  determining  the Index  Price.  The twenty  companies  and the
weights attributed to them are as follows:

<TABLE>
<CAPTION>
         Company                                              Weighting            Base Price
<S>                                                             <C>                  <C>
Arrow Financial Corporation, Glens Falls, NY                    4.051%               $20.2500
BSB Bancorp, Inc., Binghamton, NY                               5.622%               $20.9375
BT Financial Corporation, Johnstown, PA                         9.340%               $22.3750
CCBT Bancorp, Inc., Hyannis, MA                                 3.532%               $15.1250
Century Bancorp, Inc., Medford, MA                              1.589%               $16.8750
Community Bank System, Inc., Dewitt, NY                         4.796%               $25.5625
Community Banks, Inc., Millersburg, PA                          4.020%               $22.4375
F&M Bancorp, Frederick, MD                                      5.810%               $23.6250
Granite State Bankshares, Inc., Keene, NH                       3.325%               $21.8750
Harleysville National Corporation, Harleysville, PA             6.706%               $32.2500
Independent Bank Corp., Rockland, MA                            4.922%               $13.3750
National Penn Bancshares, Inc., Boyertown, PA                  12.082%               $25.8750
Sandy Spring Bancorp, Inc., Olney, MD                           6.765%               $26.7500
State Bancorp, Inc., New Hyde Park, NY                          2.805%               $13.3125
Sterling Bancorp, New York, NY                                  3.810%               $18.1250
Suffolk Bancorp, Riverhead, NY                                  4.350%               $27.3125
Sun Bancorp, Inc., Vineland, NJ                                 3.010%               $11.3750
U.S.B. Holding Co., Inc., Orangeburg, NY                        6.282%               $15.0625
Washington Trust Bancorp, Inc., Westerly, RI                    5.095%               $17.8125
Yardville National Bancorp, Mercerville, NJ                     2.088%               $12.0000
                                                              -------
                                                              100.000 %
                                                              =======
</TABLE>

                                     - 37 -

<PAGE>


                    (E) Acquire.  A company  within the Index Group is deemed to
have been "Acquired" in any combination in which,  immediately  thereafter,  its
equity  holders do not control  more than 50 percent of the equity of the entity
resulting from the combination;

          (e) by either NBTB or PAHC upon  written  notice given to the other if
the board of directors of either NBTB or PAHC shall have  determined in its sole
judgment  made in good faith,  after due  consideration  and  consultation  with
counsel,  that the Merger has become  inadvisable or  impracticable by reason of
the institution of litigation by the federal government or the government of the
State of New York or the  Commonwealth of Pennsylvania to restrain or invalidate
the transactions contemplated by this Agreement;

          (f) by either NBTB or PAHC upon  written  notice given to the other if
any of the  approvals  referred  to in section 3.1 (other  than  approvals  that
relate  solely to the Bank  Merger) are denied and such denial has become  final
and nonappealable;

          (g) by either NBTB or PAHC upon  written  notice given to the other if
(i) the  shareholders  of either  NBTB or PAHC shall have voted on and failed to
adopt  this  Agreement,  at the  meeting  of such  shareholders  called for such
purpose,  or (ii) the  shareholders  of NBTB  shall  have voted on and failed to
approve the Share Increase Amendment; or

          (h) by either NBTB or PAHC upon  written  notice given to the other if
NBTB  shall  have been  advised  by KPMG that  KPMG is  unable  to  deliver  its
favorable  opinion under  section 4.10 of this  Agreement due to the action of a
party or one or more of the affiliates,  directors, officers, or shareholders of
that party.

     11.3.  Effect  of  Termination.   In  the  event  of  the  termination  and
abandonment  hereof  pursuant to the provisions of section 11.1 or section 11.2,
this  Agreement  shall  become  void and have no force or  effect,  without  any
liability on the part of NBTB, PAHC, PA Bank, or their  respective  directors or
officers or  shareholders,  in respect of this  Agreement.  Notwithstanding  the
foregoing,   (a)  as  provided   in  section   12.4  of  this   Agreement,   the
confidentiality   agreement   contained  in  that  section  shall  survive  such
termination;  (b) the provisions of sections 11.3(b),  11.3(c),  12.1, and 12.11
shall survive; (c) if such termination is a result of any of the representations
and  warranties of a party being  materially  incorrect when made or a result of
the  material  breach or material  failure by a party of a covenant or agreement
hereunder,  such party whose  representations  and  warranties  were  materially
incorrect  or who  materially  breached  or failed to perform  its  covenant  or
agreement  shall be  liable  in the  amount of  $500,000  to the other  party or
parties hereto that are not affiliated with it; and (d) if

               (i) such termination is pursuant to section  11.2(c)(iii) of this
Agreement, or if

               (ii) this  Agreement is  terminated  for any reason  specified in
section 11.2(b)(ii) of this Agreement and a definitive agreement with respect to
an  Alternative  Proposal  is  executed by PAHC or PA Bank within one year after
such termination,

then in either  case,  and in  addition  to any  amount  payable  or paid  under
subsection (c) of this section 11.3, PAHC shall be liable to NBTB for liquidated
damages in the further  amount of  $3,000,000,  which  amount will be payable to
NBTB in immediately  available  funds within two business days after such amount
becomes due. PAHC acknowl edges that the agreements  contained in subsection (d)
of this section 11.3 are an integral part of the  transactions  contemplated  in
this  Agreement and that,  without these  agreements,  NBTB would not enter into
this Agreement.

     11.4. Waiver of Terms or Conditions. Any of the terms or conditions of this
Agreement,  to the extent legally permitted,  may be waived at any time prior to
the Effective Time by the party which is, or whose shareholders are, entitled to
the benefit thereof,  by action taken by that party (if an individual) or by the
board of directors of such

                                     - 38 -


<PAGE>




party (if a corporation), or by its chairman, or by its president; provided that
such waiver  shall be in writing and shall be taken only if, in the  judgment of
the party, board of directors,  or officer taking such action,  such waiver will
not have a materially adverse effect on the benefits intended hereunder to it or
to the shareholders of its or his corporation;  and the other parties hereto may
rely on the delivery of such a waiver as  conclusive  evidence of such  judgment
and the validity of the waiver.

     11.5.   Amendment.   Anything   herein  or   elsewhere   to  the   contrary
notwithstanding, to the extent permitted by law, this Agreement and the exhibits
hereto may be amended,  supplemented,  or  interpreted  at any time prior to the
Effective Time by written instrument duly authorized and executed by each of the
parties hereto; provided,  however, that (except as specifically provided herein
or as may be approved by such  shareholders)  this  Agreement may not be amended
after:

          (a) the  action by  shareholders  of PAHC in any  respect  that  would
change (i) the amount or kind of shares, obligations,  cash, property, or rights
to be received in exchange for or on conversion  of the PAHC Common Stock;  (ii)
any term of the  certificate  of  incorporation  of NBTB to be  effected  by the
Merger; or (iii) any of the terms and conditions of this Agreement if the change
would adversely affect the shareholders of PAHC, or

          (b) the  action by  shareholders  of NBTB in any  respect  that  would
change (i) the amount or kind of shares, obligations,  cash, property, or rights
to be received in exchange  for the NBTB  Common  Stock to be  delivered  in the
Merger; (ii) any term of the certificate of incorporation of NBTB to be effected
by the Merger; or (iii) any of the terms and conditions of this Agreement if the
change would adversely affect the shareholders of NBTB.

12.  GENERAL PROVISIONS.

     12.1. Allocation of Costs and Expenses. Except as provided in this section,
each  party  hereto  shall  pay its own fees  and  expenses,  including  without
limitation the fees and expenses of its own counsel and its own  accountants and
tax advisers,  incurred in connection  with this Agreement and the  transactions
contemplated thereby. For purposes of this section, (i) the cost of printing the
Joint Proxy Statement shall be apportioned  between NBTB and PAHC based upon the
number of copies each shall  request to be printed,  (ii) the cost of delivering
the Joint Proxy  Statement and other material to be transmitted to  shareholders
of NBTB  shall be deemed  to be  incurred  on behalf of NBTB,  (iii) the cost of
delivering  the Joint Proxy  Statement and other  material to be  transmitted to
shareholders  of PAHC shall be deemed to be incurred on behalf of PAHC, (iv) the
cost of  registering  under federal and state securi ties laws the stock of NBTB
to be  received  by the  shareholders  of PAHC shall be deemed to be incurred on
behalf of NBTB,  and (v) the cost of  procuring  the tax opinion  referred to in
section 3.4 of this Agreement shall be deemed to be incurred on behalf of PAHC.

     12.2. Mutual Cooperation.

          (a) Subject to the terms and conditions  herein  provided,  each party
shall use its best efforts,  and shall  cooperate fully with the other party, in
expeditiously carrying out the provisions of this Agreement and in expeditiously
making all filings and obtaining all necessary  governmental  approvals,  and as
soon as  practicable  shall  execute and  deliver,  or cause to be executed  and
delivered,   such  governmental   notifications  and  additional  documents  and
instruments and do or cause to be done all additional things necessary,  proper,
or  advisable  under  applicable  law to  consummate  and make  effective on the
earliest practicable date the transactions contemplated hereby.

          (b) NBTB and PAHC  shall  promptly  prepare  and file with the SEC the
Joint Proxy Statement, and NBTB shall promptly prepare and file with the SEC the
Registration Statement in which the Joint

                                     - 39 -

<PAGE>


Proxy  Statement  will be included as a prospectus.  NBTB and PAHC shall use all
reasonable  efforts to have the Registration  Statement declared effective under
the Securities Act as promptly as practicable after such filing. Each party will
supply in a timely fashion such  information  concerning  such party as shall be
necessary  or  appropriate  for  inclusion  in the  Joint  Proxy  Statement  and
Registration Statement.

     12.3.  Form of Public  Disclosures.  NBTB and PAHC shall  mutually agree in
advance upon the form and substance of all public  disclosures  concerning  this
Agreement and the transactions contemplated hereby.

     12.4. Confidentiality.  NBTB, PAHC, and their respective subsidiaries shall
use all information  that each obtains from the other pursuant to this Agreement
solely for the effectuation of the  transactions  contemplated by this Agreement
or for other  purposes  consistent  with the intent of this  Agreement.  Neither
NBTB, PAHC, nor their respective  subsidiaries shall use any of such information
for any other purpose, including,  without limitation, the competitive detriment
of any other party.  NBTB and PAHC shall maintain as strictly  confidential  all
information  each of them  learns  from the other and  shall,  at any time after
termination  of this Agreement in accordance  with the terms  thereof,  upon the
request of the other, return promptly to it all documentation  provided by it or
made  available  to  third  parties.  Each  of the  parties  may  disclose  such
information to its respective affiliates,  counsel,  accountants,  tax advisers,
and  consultants,  provided  that such  parties are advised of the  confidential
nature of such  information  and agree to be bound by the terms of this  section
12.4. The confidentiality  agreement contained in this section 12.4 shall remain
operative  and in full force and effect,  and shall survive the  termination  of
this Agreement.

     12.5. Claims of Brokers.

          (a) PAHC shall  indemnify,  defend,  and hold NBTB harmless for, from,
and against any claim, suit,  liability,  fees, or expenses (including,  without
limitation,  attorneys'  fees and costs of court)  arising  out of any claim for
brokerage commissions,  finder's fees, or similar compensation arising out of or
due to any of its acts in connection with the transactions  contemplated by this
Agreement or based upon any agreement or arrangement made by it or on its behalf
with respect to NBTB.

          (b) NBTB shall  indemnify,  defend,  and hold PAHC harmless for, from,
and against any claim, suit,  liability,  fees, or expenses (including,  without
limitation,  attorneys'  fees and costs of court)  arising  out of any claim for
brokerage commissions,  finder's fees, or similar compensation arising out of or
due to any of its acts in connection with any of the  transactions  contemplated
by this  Agreement or based upon any agreement or  arrangement  made by it or on
its behalf with respect to PAHC.

     12.6. Information for Applications and Registration Statement.

          (a) Each party represents and warrants that all information concerning
it  which  is  included  in  any  statement  and   application   (including  the
Registration  Statement) made to any governmental  agency in connection with the
transactions  contemplated  by this  Agreement  shall not,  with respect to such
party,  contain an untrue statement of a material fact or omit any material fact
required to be stated therein or necessary to make the statements made, in light
of the  circumstances  under which they were made, not misleading.  The party so
representing and warranting will indemnify, defend, and hold harmless the other,
each of its directors and officers,  each  underwriter and each person,  if any,
who controls the other within the meaning of the  Securities  Act, for, from and
against any and all losses, claims, suits, damages,  expenses, or liabilities to
which any of them may become subject under applicable laws  (including,  but not
limited to, the Securities  Act and the Exchange Act) and rules and  regulations
thereunder and will  reimburse  them for any legal or other expenses  reasonably
incurred by them in  connection  with  investigating  or  defending  any actions
whether or not resulting in liability,  insofar as such losses, claims, damages,
expenses,  liabilities,  or  actions  arise out of or are based  upon any untrue
statement or alleged  untrue  statement of a material fact contained in any such
application  or  statement  or arise out of or are based  upon the  omission  or
alleged omission to state therein a material fact required to be stated therein,
or necessary in order to make the statements

                                     - 40 -

<PAGE>


therein not  misleading,  but only insofar as any such statement or omission was
made in reliance upon and in conformity with information furnished in writing by
the  representing  and warranting  party  expressly for use therein.  Each party
agrees  at any time upon the  request  of the  other to  furnish  to the other a
written letter or statement confirming the accuracy of the information contained
in any proxy statement,  registration statement, report, or other application or
statement,  and confirming that the  information  contained in such document was
furnished expressly for use therein or, if such is not the case,  indicating the
inaccuracies  contained in such document or draft or indicating the  information
not furnished  expressly for use therein.  The indemnity  agreement contained in
this  section  12.6(a)  shall  remain  operative  and in full force and  effect,
regardless  of any  investigation  made  by or on  behalf  of  any of the  other
parties, and shall survive the termination of this Agreement or the consummation
of the transactions contemplated thereby.

          (b) In  order  to  provide  for just  and  equitable  contribution  in
circumstances in which the indemnity  agreement  contained in section 12.6(a) of
this Agreement is for any reason held by a court of competent jurisdiction to be
unenforceable as to any or every party,  then the parties in such  circumstances
shall  contribute  to the  aggregate  losses,  claims,  damages and  liabilities
(including any  investigation,  legal and other expenses  incurred in connection
with, and any amounts paid in settlement  of, any action,  suit or proceeding or
any claims asserted) to which any party may be subject in such proportion as the
court of law determines based on the relative fault of the parties.

     12.7. Standard of Materiality and of Material Adverse Effect.

          (a) For purposes of sections 4, 6, and 7 of this Agreement,  the terms
"material"  and  "materially,"  when  used  with  reference  to  items  normally
expressed in dollars,  shall be deemed to refer to amounts  individually  and in
the aggregate in excess of 3 percent of the  shareholders'  equity of PAHC as of
September  30,  1999,  as  determined  in  accordance  with  generally  accepted
accounting principles.

          (b) For purposes of sections 5, 8, and 9 of this Agreement,  the terms
"material"  and  "materially,"  when  used  with  reference  to  items  normally
expressed in dollars,  shall be deemed to refer to amounts  individually  and in
the aggregate in excess of 3 percent of the  shareholders'  equity of NBTB as of
September  30,  1999,  as  determined  in  accordance  with  generally  accepted
accounting principles.

          (c) For other purposes and, notwithstanding subsections (a) and (b) of
this section 11.7, when used anywhere in this Agreement with explicit  reference
to any  of  the  federal  securities  laws  or to  the  Proxy  Statement  or the
Registration Statement, the terms "material" and "materially" shall be construed
and  understood  in  accordance  with  standards of  materiality  as  judicially
determined under the federal securities laws.

          (d) The term "Material Adverse Effect" wherever used in this Agreement
shall mean, with respect to a person, a material adverse effect on the business,
results of operations,  financial  condition or prospects of such person and its
subsidiaries  taken as a whole or a  material  adverse  effect on such  person's
ability to consummate the  transactions  contemplated  hereby on a timely basis;
provided,  that, in determining  whether a Material Adverse Effect has occurred,
there shall be excluded any effect on the  referenced  person the cause of which
is (i) any change in banking laws, rules or regulations of general applicability
or  interpretations  thereof  by courts or  governmental  authorities,  (ii) any
change in generally  accepted  accounting  principles or  regulatory  accounting
requirements applicable to banks or their holding companies generally, (iii) any
action  or  omission  of PAHC or any of its  subsidiaries  taken  with the prior
written  consent of NBTB, or of NBTB or any of its  subsidiaries  taken with the
prior  written  consent  of  PAHC,  or (iv)  any  changes  in  general  economic
conditions affecting banks or their holding companies.

     12.8.  Adjustments  for Certain  Events.  Anything in this agreement to the
contrary  notwithstanding,  all  prices  per  share,  share  amounts,  per-share
amounts, and exchange ratios referred to in this Agreement (including

                                     - 41 -

<PAGE>


without  limitation  section 11.2(d) of this Agreement)  shall be  appropriately
adjusted to account for stock dividends, split-ups, mergers,  recapitalizations,
combinations,  conversions,  exchanges of shares or the like, but not for normal
and recurring cash dividends  declared or paid in a manner  consistent  with the
established practice of the payer.

     12.9.  Counterparts.  This  Agreement  may  be  executed  in  two  or  more
counterparts  each of which shall be deemed to constitute an original,  but such
counterparts  together shall be deemed to be one and the same  instrument and to
become effective when one or more  counterparts  have been signed by each of the
parties  hereto.  It shall not be necessary in making proof of this Agreement or
any counterpart hereof to produce or account for the other counterpart.

     12.10. Entire Agreement. This Agreement sets forth the entire understanding
of the parties hereto with respect to their  commitments to each other and their
undertakings  vis-a-vis each other on the subject  matter  hereof.  Any previous
agreements or  understandings  among the parties  regarding  the subject  matter
hereof  are  merged  into and  superseded  by this  Agreement.  Nothing  in this
Agreement express or implied is intended or shall be construed to confer upon or
to give  any  person,  other  than  NBTB,  Newco,  PAHC,  and  their  respective
shareholders, any rights or remedies under or by reason of this Agreement.

     12.11. Survival of Representations,  Warranties, and Covenants. None of the
representations,  warranties,  covenants, and agreements in this Agreement or in
any instrument delivered pursuant to this Agreement (other than the Stock Option
Agreement,  the employment  agreement  described in section 4.8 hereof,  and the
change-in-control  agreements  described  in section 5.5  hereof,  each of which
shall terminate in accordance with its terms), shall survive the Effective Time,
except for sections 9.6, 12.4,  12.6,  and those other  covenants and agreements
contained  herein and  therein  which by their  terms  apply in whole or in part
after the Effective Time.

     12.12.  Section Headings.  The section and subsection  headings herein have
been inserted for  convenience  of reference  only and shall in no way modify or
restrict  any of the terms or  provisions  hereof.  Any  reference to a "person"
herein shall  include an  individual,  firm,  corporation,  partnership,  trust,
government  or  political  subdivision  or  agency or  instrumentality  thereof,
association, unincorporated organization, or any other entity.

     12.13.  Notices.  All notices,  consents,  waivers, or other communications
which are required or permitted hereunder shall be in writing and deemed to have
been duly given if delivered personally or by messenger, transmitted by telex or
telegram,  by express courier,  or sent by registered or certified mail,  return
receipt requested, postage prepaid. All communications shall be addressed to the
appropriate address of each party as follows:

If to NBTB:

           NBT Bancorp Inc.
           52 South Broad Street
           Norwich, New York  13815

           Attention:           Mr. Daryl R. Forsythe
                                President and Chief Executive Officer

With a required copy to:

           Brian D. Alprin, Esq.
           Duane, Morris & Heckscher LLP
           1667 K Street, N.W., Suite 700
           Washington, D.C.  20006

                                     - 42 -

<PAGE>




If to PAHC or PA Bank:

           Pioneer American Holding Company Corp.
           41 North Main Street
           Carbondale, Pennsylvania 18407

           Attention:           Mr. John W. Reuther
                                President and Chief Executive Officer

With a required copy to:

           Lawrence R. Wiseman, Esq.
           Blank Rome Comisky & McCauley LLP
           One Logan Square
           Philadelphia, Pennsylvania 19103-6998


     All such notices shall be deemed to have been given on the date  delivered,
transmitted, or mailed in the manner provided above.

     12.14.  Choice of Law and  Venue.  This  Agreement  shall be  governed  by,
construed,  and enforced in  accordance  with the laws of the State of Delaware,
without giving effect to the principles of conflict of law thereof,  except that
the BCL (in the case of  PAHC)  shall  govern  with  respect  to the  terms  and
conditions  of the Merger,  the  approval  and  effectiveness  thereof,  and the
authorization,  cancellation,  or  issuance of the stock or options of PAHC with
respect  thereto.  The parties hereby designate the Chancery Court in New Castle
County,  Delaware to be the proper jurisdiction and venue for any suit or action
arising  out of  this  Agreement.  Each  of the  parties  consents  to  personal
jurisdiction  in such  venue for such a  proceeding  and  agrees  that it may be
served  with  process  in any  action  with  respect  to this  Agreement  or the
transactions  contemplated  thereby by  certified  or  registered  mail,  return
receipt  requested,  or to its  registered  agent for  service of process in the
State of Delaware.  Each of the parties irrevocably and  unconditionally  waives
and agrees,  to the fullest extent  permitted by law, not to plead any objection
that it may now or hereafter  have to the laying of venue or the  convenience of
the  forum  of any  action  or  claim  with  respect  to this  Agreement  or the
transactions contemplated thereby brought in the courts aforesaid.

     12.15. Knowledge of a Party.  References in this Agreement to the knowledge
of a party shall mean the actual  knowledge  possessed by the present  executive
officers of such party.

     12.16. Binding Agreement.  This Agreement shall be binding upon the parties
and their respective successors and assigns.

     IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first above written.

                                        NBT BANCORP INC.

                                        By:          DARYL R. FORSYTHE
                                           -------------------------------------
                                                     Daryl R. Forsythe
                                           President and Chief Executive Officer

                                     - 43 -

<PAGE>





                                        By:          JOHN D. ROBERTS
                                           -------------------------------------
                                                     John D. Roberts
                                            Senior Vice President and Secretary

                                        LEVON ACQUISITION COMPANY

                                        By:          DARYL R. FORSYTHE
                                           -------------------------------------
                                                     Daryl R. Forsythe
                                           President and Chief Executive Officer

                                        By:          JOHN D. ROBERTS
                                           -------------------------------------
                                                     John D. Roberts
                                                       Secretary

                                        PIONEER AMERICAN HOLDING COMPANY
                                        CORP.

                                        By:          JOHN W. REUTHER
                                           -------------------------------------
                                                     John W. Reuther
                                           President and Chief Executive Officer

                                        By:          ANTOINETTE STICKER
                                           -------------------------------------
                                                     Antoinette Sticker
                                                           Secretary

                                     - 44 -

<PAGE>


- -----------------------------------
                                       )
State of New York                      )
                                       )       ss.
County of Chenango                     )
                                   )
- -----------------------------------

     On this seventh day of December,  1999, before me personally appeared Daryl
R. Forsythe,  to me known to be the President and Chief Executive Officer of NBT
Bancorp Inc.,  and John D. Roberts,  to me known to be the Senior Vice President
and Secretary of NBT Bancorp Inc., and each  acknowledged  said instrument to be
the  free  and  voluntary  act and  deed of said  corporation,  for the uses and
purposes  therein  mentioned,  and on oath each stated that he was authorized to
execute said  instrument and that the seal affixed is the corporate seal of said
corporation.

     In Witness Whereof I have hereunto set my hand and affixed my official seal
the day and year first above written.

                   DAVID R. THELEMAN
          -----------------------------------
                    Notary Public

                   DAVID R. THELEMAN
           Notary Public, State of New York
               Broome County, # 4940266
            Commission Expires Aug. 8, 2000


                                     - 45 -

<PAGE>



- -----------------------------------
                                       )
State of New York                      )
                                       )       ss.
County of Chenango                     )
                                   )
- -----------------------------------

     On this seventh day of December,  1999, before me personally appeared Daryl
R.  Forsythe,  to me known to be the  President and Chief  Executive  Officer of
Levon Acquisition  Company, and John D. Roberts, to me known to be the Secretary
of Levon  Acquisition  Company,  and each acknowledged said instrument to be the
free and voluntary act and deed of said  corporation,  for the uses and purposes
therein  mentioned,  and on oath each stated that he was  authorized  to execute
said  instrument  and  that  the  seal  affixed  is the  corporate  seal of said
corporation.

     In Witness Whereof I have hereunto set my hand and affixed my official seal
the day and year first above written.

                   DAVID R. THELEMAN
          -----------------------------------
                    Notary Public

                   DAVID R. THELEMAN
           Notary Public, State of New York
               Broome County, # 4940266
            Commission Expires Aug. 8, 2000



                                     - 46 -

<PAGE>


- -----------------------------------
                                           )
Commonwealth of Pennsylvania           )
                                           )   ss.
County of Lackawanna                   )
                                   )
- -----------------------------------

     On this seventh day of December,  1999, before me personally  appeared John
W.  Reuther,  to me known to be the  President  and Chief  Executive  Officer of
Pioneer American Holding Company Corp., and Antoinette  Sticker,  to me known to
be  the  Secretary  of  Pioneer   American   Holding  Company  Corp.,  and  each
acknowledged  said  instrument to be the free and voluntary act and deed of said
corporation,  for the uses and  purposes  therein  mentioned,  and on oath  each
stated  that he was  authorized  to execute  said  instrument  and that the seal
affixed is the corporate seal of said corporation.

     In Witness Whereof I have hereunto set my hand and affixed my official seal
the day and year first above written.

                 LISA ANN BUCHINSKI
          -----------------------------------
                    Notary Public

                    Notarial Seal
          Lisa Ann Buchinski, Notary Public
            Carbondale, Lackawanna County
         My Commission Expires Oct. 16, 2000



                                     - 47 -

<PAGE>


     The  undersigned  members of the Board of  Directors  of  Pioneer  American
Holding Company Corp. ("PAHC"), acknowledging that NBT Bancorp Inc. ("NBTB") has
relied upon the action  heretofore  taken by the board of  directors in entering
into the  Agreement,  and has  required  the same as a  prerequisite  to  NBTB's
execution of the Agreement,  do  individually  and as a group agree,  subject to
their  fiduciary  duties  to  shareholders,  to  support  the  Agreement  and to
recommend its adoption by the other shareholders of PAHC.

     The undersigned do hereby, individually and as a group, until the Effective
Time or termination of the Agreement,  further agree to refrain from  soliciting
or, subject to their fiduciary duties to shareholders,  negotiating or accepting
any offer of merger,  consolidation,  or acquisition of any of the shares or all
or substantially all of the assets of PAHC or PA Bank, National Association.

         JOSEPH G. NASSER                                 MICHAEL M. MURPHY
- ------------------------------------               -----------------------------

         R. CHOJNOWSKI                                    JOHN W. WALSKI
- ------------------------------------               -----------------------------


         ELDORE SEBASTIANELLI                             GENE E. GOLDENZIEL
- ------------------------------------               -----------------------------

         JOHN W. REUTHER                              MARGARET O'CONNOR-FLETCHER
- ------------------------------------               -----------------------------



                                     - 48 -

<PAGE>




                                  SCHEDULE 1.10
                                  -------------


                               Richard Chojnowski
                               Gene E. Goldenziel
                                Michael M. Murphy
                                Joseph G. Nasser
                             William K. Nasser, Sr.
                             William K. Nasser, Jr.
                          Margaret L. O'Connor-Fletcher
                                 John W. Reuther
                              Eldore Sebastianelli
                                 John W. Walski




                                     - 49 -


<PAGE>


                                   APPENDIX B

               FAIRNESS OPINION OF MCCONNELL, BUDD & DOWNES, INC.

                                                                  March 31, 2000

The Board of Directors
NBT Bancorp Inc.
52 South Broad Street
Norwich, New York 13815


The Board of Directors:

     You have requested our opinion as to the fairness,  from a financial  point
of view, to the  stockholders of' NBT Bancorp Inc. ("NBT") of the Exchange Ratio
governing the exchange of shares of the common stock of Pioneer American Holding
Company Corp. (Pioneer American) for shares of common stock of NBT in connection
with  the  proposed  acquisition  of  Pioneer  American  by NBT  pursuant  to an
Agreement and Plan of Merger (the "Merger  Agreement') dated December 7, 1999 by
and between Pioneer American and NBT. Pursuant to the Merger Agreement,  Pioneer
American will merge with and into NBT, with NBT being the surviving corporation.

     As  is  more  specifically  set  forth  in  the  Merger   Agreement,   upon
consummation of the merger,  each  outstanding  share of Pioneer American common
stock, except for shares held by NBT and its subsidiaries or by Pioneer American
and its  subsidiaries  (in both  cases,  other than  shares  held in a fiduciary
capacity or as a result of debts previously contracted),  will be exchanged into
1.805 shares of NBT Common Stock.  The Merger  Agreement may be terminated under
certain  conditions  prior to the  effective  time of the merger by the Board of
Directors of either party based on defined criteria.

     McConnell, Budd & Downes, Inc., as part of its investment banking business,
is  regularly  engaged in the  valuation of bank  holding  companies  and banks,
thrift  holding  companies and thrifts and their  securities in connection  with
mergers  and  acquisitions,   negotiated   underwritings,   private  placements,
competitive bidding processes,  market making as a NASD market maker,  secondary
distributions  of listed  securities and  valuations  for corporate,  estate and
other purposes.  Our experience and familiarity  with NBT includes having worked
as a financial  advisor to NBT since October 20, 1994 on a contractual basis and
specifically  includes our participation in the process and negotiations leading
up to the proposed  merger with Pioneer  American.  In the course of our role as
financial  advisor to NBT in connection  with the merger,  we have received fees
for our services and will receive  additional  fees contingent on the occurrence
of certain defined events.  While the payment of all or a significant portion of
fees  related  to  financial  advisory  services  provided  in  connection  with
arm's-length   mergers  and  other  business   combination   transactions   upon
consummation of such transactions,  as is the case with this transaction,  might
be viewed  as  giving  such  financial  advisors  a  financial  interest  in the
successful completion of such transactions,  such compensation  arrangements are
standard  and  customary  for   transactions  of  the  size  and  type  of  this
transaction.

     In arriving at our opinion, we have reviewed the Merger Agreement.  We have
also reviewed publicly available business, financial and shareholder information
relating to NBT and its subsidiaries and certain  publicly  available  financial
and shareholder information relating to Pioneer American.

     In connection with the foregoing,  we have (i) reviewed Pioneer  American's
Annual  Reports  to  Stockholders,  Annual  Reports  on Form  10-K  and  related
financial information for the four calendar years ended


                                      - 1 -

<PAGE>


December  31,  1998 and  Pioneer  American's  Quarterly  Report on Form 10-Q and
related  unaudited  financial  information  for 1999; (ii) reviewed NBT's Annual
Reports  to  Stockholders,  Annual  Reports on Form 10-K and  related  financial
information  for the four  calendar  years  ended  December  31,  1998 and NBT's
Quarterly Report on Form 10-Q and related  unaudited  financial  information for
1999;  (iii)  reviewed  certain  internal  financial  information  and financial
forecasts,  relating to the business, earnings, cash flows, assets and prospects
of the  respective  companies  furnished to  McConnell,  Budd & Downes,  Inc. by
Pioneer  American and NBT,  respectively;  (iv) held discussions with members of
the senior  management and board of NBT concerning the past and current  results
of operations of NBT, its current financial  condition and management's  opinion
of its future prospects;  (v) held discussions with members of senior management
of Pioneer  American  concerning  the past and current  results of operations of
Pioneer American,  its current financial  condition and management's  opinion of
its future  prospects;  (vi) reviewed the historical  record of reported prices,
trading volume and dividend  payments for both NBT and Pioneer  American  common
stock;  (vii)  considered  the  current  state of and future  prospects  for the
economy of New York and Pennsylvania generally and the relevant market areas for
NBT and Pioneer American in particular; (viii) reviewed specific merger analysis
models employed by McConnell, Budd & Downes, Inc. to evaluate potential business
combinations  of financial  institutions;  (ix) reviewed the reported  financial
terms of selected recent business combinations in the banking industry;  and (x)
performed  such other  studies and analyses as  McConnell,  Budd & Downes,  Inc.
considered  appropriate under the circumstances  associated with this particular
transaction.

     In the course of our review and analysis we considered, among other things,
such topics as the historical and projected  future  contributions  of recurring
earnings by the parties,  the anticipated  future earnings per share results for
the parties on both a combined and stand-alone  basis,  the potential to realize
significant  recurring  operating  expense  reductions and the impact thereof on
projected  future earnings per share,  the relative  capitalization  and capital
adequacy of each of the parties, the availability of non-interest income to each
of the parties,  the relative asset quality and apparent adequacy of the reserve
for loan losses for each of the parties.  We also  considered the composition of
deposits and the  composition of the loan portfolio of each of Pioneer  American
and NBT. In addition,  we  considered  the  historical  trading  range,  trading
pattern  and  relative  market  liquidity  of the  common  shares of each of the
parties.  In the  conduct of our review and  analysis  we have  relied  upon and
assumed, without independent verification,  the accuracy and completeness of the
financial  information  provided  to us by  Pioneer  American  and  NBT  and  or
otherwise publicly  obtainable.  In reaching our opinion we have not assumed any
responsibility  for the  independent  verification  of such  information  or any
independent  valuation or appraisal of any of the assets or the  liabilities  of
either Pioneer American or NBT, nor have we obtained from any other source,  any
current  appraisals of the assets or liabilities  of either Pioneer  American or
NBT. We have also relied on the management of Pioneer American and NBT as to the
reasonableness  of  various  financial  and  operating   forecasts  and  of  the
assumptions  on which they are based,  which were  provided to us for use in our
analyses.

     In the course of rendering  this opinion,  which is being rendered prior to
the  receipt  of  certain  required   regulatory   approvals   necessary  before
consummation of the merger,  we assume that no conditions will be imposed by any
regulatory agency in connection with its approval of the merger that will have a
material adverse effect on the results of operations, the financial condition or
the prospects of NBT following consummation of the merger.

     Based upon and subject to the foregoing,  it is our opinion, that as of the
date of this letter,  the exchange ratio is fair to the stockholders of NBT from
a financial point of view.

                                                  Very truly yours,

                                              /s/ McConnell, Budd & Downes, Inc.
                                              ----------------------------------
                                                  McConnell, Budd & Downes, Inc.


                                      - 2 -

<PAGE>


                                   APPENDIX C
                  FAIRNESS OPINION OF DANIELSON ASSOCIATES INC.

                            DANIELSON ASSOCIATES INC.
                            6110 EXECUTIVE BOULEVARD
                                    SUITE 504
                         ROCKVILLE, MARYLAND 20852-3903      PITTSBURGH OFFICE
                               TEL: (301) 468-4884           -------------------
                               FAX: (301) 468-0013           TEL: (412) 262-3207


                                                    March 10, 2000

Board of Directors
Pioneer American Holding Company Corp.
41 North Main Street
Carbondale, Pennsylvania 18407

Dear Members of the Board:

     Set forth  herein is the  updated  opinion  of  Danielson  Associates  Inc.
("Danielson  Associates") as to the "fairness" of the offer by NBT Bancorp, Inc.
("NBT")  of  Norwich,  New York to acquire  all of the  common  stock of Pioneer
American Holding Company  Corporation  ("Pioneer") of Carbondale,  Pennsylvania.
The  "fair"  sale  value is  defined  as the price at which all of the shares of
Pioneer's common stock would change hands between a willing seller and a willing
buyer, each having reasonable  knowledge of the relevant facts. In opining as to
the  "fairness"  of the offer,  it also had to be  determined  if the NBT common
stock that is to be exchanged for Pioneer stock is "fairly" valued.

     In preparing the original  opinion,  Pioneer's  market was analyzed and its
business and prospects  were reviewed.  We also  conducted such other  financial
analyses  as  we  deemed   appropriate  such  as  comparable  company  analyses,
comparable  transactions and pro forma dilution. Any unique characteristics also
were considered.

     This opinion was based partly on data  supplied to Danielson  Associates by
Pioneer,  but it relied on some public  information all of which was believed to
be reliable, but neither the completeness nor accuracy of such information could
be guaranteed.  In particular,  the opinion assumed, based on NBT's management's
representation,  that there were no significant  asset quality  problems  beyond
what was stated in recent  reports to  regulatory  agencies  and in the  monthly
report to the directors.


                                      C-1

<PAGE>

Board of Directors
March 10, 2000
Page Two


     In determining the "fair" sale value of Pioneer,  the primary  emphasis was
on prices paid relative to earnings for  Pennsylvania  and Northeast  banks that
had similar financial, structural and market characteristics.  These prices were
then related to assets and equity capital, also referred to as "book."

     The "fair"  market value of NBT's common stock to be exchanged  for Pioneer
stock was determined by a comparison  with other similar bank holding  companies
and included no in-person due diligence of NBT. This comparison showed NBT stock
to be valued consistent with the comparable banks.

     In the original  opinion,  based on Pioneer's  recent  performance  and its
future   potential,   comparisons   with   similar   transactions   and   unique
characteristics,  it was  determined  that its "fair" sale value was between $80
and $89  million,  or $27.67 to $30.76 per  share.  Thus,  NBT's  offer of $87.5
million,  or $29.22 per share, was a "fair" offer from a financial point of view
for Pioneer and its shareholders.

     There has been no  subsequent  change in NBT's  performance,  but its stock
price has declined by about 15%,  which is consistent  with most other  regional
banks  since the time of the  offer.  Thus,  the  value of NBT's  offer is still
"fair" from a financial point of view to Pioneer  American and its  shareholders
based on the changed market conditions.

                                        Respectfully submitted,

                                        /s/ Arnold G. Danielson

                                        Arnold G. Danielson
                                        Chairman
                                        Danielson Associates Inc.

AGD:msf
Enclosure


                                       C-2

<PAGE>


                                   APPENDIX D


Sections  1571  through  1580  of the  Pennsylvania  Business  Corporation  Law,
regarding dissenters' rights


                      PENNSYLVANIA Business Corporation Law
                         Subchapter D. Dissenters Rights

     1571 APPLICATION AND EFFECT OF SUBCHAPTER.  -- (a) General rule.  Except as
otherwise provided in subsection (b), any shareholder of a business  corporation
shall have the right to dissent from, and to obtain payment of the fair value of
his shares in the event of, any corporate  action,  or to otherwise  obtain fair
value for his shares,  where this part  expressly  provides  that a  shareholder
shall have the rights and remedies provided in this subchapter. See:

     Section 1906(c) (relating to dissenters rights upon special treatment).
     Section 1930 (relating to dissenters rights).
     Section 1931(d) (relating to dissenters rights in share exchanges).
     Section 1932(c) (relating to dissenters rights in asset transfers).
     Section 1952(d) (relating to dissenters rights in division).
     Section 1962(c) (relating to dissenters rights in conversion).
     Section 2104(b) (relating to procedure).
     Section  2324  (relating  to  corporation  option  where a  restriction  on
     transfer of a security is held invalid).
     Section 2325(b) (relating to minimum vote requirement).
     Section 2704(c) (relating to dissenters rights upon election).
     Section 2705(d) (relating to dissenters rights upon renewal of election).
     Section 2907(a)  (relating to proceedings to terminate breach of qualifying
     conditions).
     Section 7104(b)(3) (relating to procedure).

     (b) Exceptions.  -- (I) Except as otherwise  provided in paragraph (2), the
holders of the shares of any class or series of shares that,  at the record date
fixed to  determine  the  shareholders  entitled to notice of and to vote at the
meeting at which a plan  specified in any of section 1930,  1931(d),  1932(c) or
1952(d) is to be voted on, are either:

     (i) listed on a national securities exchange; or

     (ii) held of record by more than 2,000 shareholders;

shall not have the right to obtain  payment of the fair value of any such shares
under this subchapter.

     (2)  Paragraph  (1)  shall  not  apply to and  dissenters  rights  shall be
available without regard to the exception provided in that paragraph in the case
of:

     (i) Shares  converted by a plan if the shares are not converted solely into
shares of the acquiring, surviving, new or other corporation or solely into such
shares and money in lieu of fractional shares.

     (ii) Shares of any preferred or special class unless the articles, the plan
or the terms of the  transaction  entitle all  shareholders of the class to vote
thereon  and require for the  adoption  of the plan or the  effectuation  of the
transaction  the  affirmative  vote  of a  majority  of the  votes  cast  by all
shareholders of the class.

     (iii) Shares entitled to dissenters  rights under section 1906(c) (relating
to dissenters rights upon special treatment).


                                       D-1

<PAGE>


     (3) The  shareholders  of a corporation  that acquires by purchase,  lease,
exchange or other disposition all or substantially  all of the shares,  property
or assets of another  corporation  by the  issuance  of shares,  obligations  or
otherwise, with or without assuming the liabilities of the other corporation and
with or without the intervention of another  corporation or other person,  shall
not be entitled to the rights and remedies of dissenting  shareholders  provided
in  this  subchapter  regardless  of the  fact,  if it be  the  case,  that  the
acquisition was accomplished by the issuance of voting shares of the corporation
to be  outstanding  immediately  after  the  acquisition  sufficient  to elect a
majority or more of the directors of the corporation.

     (c) Grant of optional  dissenters  rights. -- The bylaws or a resolution of
the board of directors may direct that all or a part of the  shareholders  shall
have  dissenters  rights  in  connection  with  any  corporate  action  or other
transaction  that would  otherwise  not entitle such  shareholder  to dissenters
rights.

     (d) Notice of dissenters  rights. -- Unless otherwise  provided by statute,
if a proposed  corporate action that would give rise to dissenters  rights under
this subpart is submitted to a vote at a meeting of shareholders, there shall be
included in or enclosed with the notice of meeting:

     (1)  A  statement  of  the  proposed   action  and  a  statement  that  the
shareholders  have a right to dissent  and  obtain  payment of the fair value of
their shares by complying with the terms of this subchapter, and

     (2) A copy of this subchapter.

     (e) Other  statutes.  -- The  procedures of this  subchapter  shall also be
applicable to any transaction described in any statute other than this part that
makes  reference  to this  subchapter  for the  purpose of  granting  dissenters
rights.

     (f) Certain provisions of articles ineffective.  -- This subchapter may not
be relaxed by any provision of the articles.

     (g) Cross  references.  -- See sections 1105  (relating to  restriction  on
equitable relief),  1904 (relating to de facto transaction  doctrine  abolished)
and 2512 (relating to dissenters rights procedure).

     1572  DEFINITIONS.  -- The  following  words and phrases  when used in this
subchapter  shall have the  meanings  given to them in this  section  unless the
context clearly indicates otherwise:

     "Corporation."  The  issuer of the  shares  held or owned by the  dissenter
before the corporate action or the successor by merger, consolidation, division,
conversion or otherwise of that issuer.  A plan of division may designate  which
of the resulting  corporations is the successor  corporation for the purposes of
this  subchapter.  The  successor  corporation  in a  division  shall  have sole
responsibility  for  payments to  dissenters  and other  liabilities  under this
subchapter except as otherwise provided in the plan of division.

     "Dissenter." A shareholder or beneficial  owner who is entitled to and does
assert  dissenters  rights under this subchapter and who has performed every act
required up to the time involved for the assertion of those rights.

     "Fair value." The fair value of shares  immediately before the effectuation
of the corporate action to which the dissenter objects,  taking into account all
relevant factors, but excluding any appreciation or depreciation in anticipation
of the corporate action.

     "Interest."  Interest from the effective date of the corporate action until
the  date of  payment  at  such  rate as is fair  and  equitable  under  all the
circumstances,  taking into account all relevant factors,  including the average
rate currently paid by the corporation on its principal bank loans.


                                       D-2

<PAGE>


     1573 RECORD AND  BENEFICIAL  HOLDERS AND OWNERS.  -- (a) Record  holders of
shares.  -- A record  holder of  shares of a  business  corporation  may  assert
dissenters rights as to fewer than all of the shares registered in his name only
if he  dissents  with  respect  to all the  shares  of the same  class or series
beneficially  owned by any one person and  discloses the name and address of the
person or persons on whose behalf he dissents.  In that event,  his rights shall
be determined as if the shares as to which he has dissented and his other shares
were registered in the names of different shareholders.

     (b)  Beneficial  owners of  shares.  -- A  beneficial  owner of shares of a
business  corporation who is not the record holder may assert  dissenters rights
with  respect to shares held on his behalf and shall be treated as a  dissenting
shareholder  under the terms of this subchapter if he submits to the corporation
not later than the time of the assertion of dissenters  rights a written consent
of the record  holder.  A beneficial  owner may not dissent with respect to some
but less than all shares of the same class or series owned by the owner, whether
or not the shares so owned by him are registered in his name.

     1574  NOTICE  OF ON TO  DISSENT.  -- If the  proposed  corporate  action is
submitted to a vote at a meeting of shareholders of a business corporation,  any
person who wishes to dissent and obtain  payment of the fair value of his shares
must file with the corporation, prior to the vote, a written notice of intention
to demand that he be paid the fair value for his shares if the  proposed  action
is effectuated,  must effect no change in the beneficial ownership of his shares
from the date of such  filing  continuously  through the  effective  date of the
proposed  action and must  refrain  from  voting his shares in  approval of such
action.  A  dissenter  who fails in any  respect  shall not acquire any right to
payment of the fair value of his shares under this  subchapter.  Neither a proxy
nor a vote against the proposed  corporate  action shall  constitute the written
notice required by this section.

     1575 NOTICE TO DEMAND  PAYMENT.  -- (a) General  rule.  -- If the  proposed
corporate  action is approved by the required vote at a meeting of  shareholders
of a business  corporation,  the corporation  shall mail a further notice to all
dissenters  who gave due notice of intention to demand payment of the fair value
of their shares and who re frained from voting in favor of the proposed  action.
If the proposed  corporate action is to be taken without a vote of shareholders,
the corporation  shall send to all  shareholders who are entitled to dissent and
demand payment of the fair value of their shares a notice of the adoption of the
plan or other corporate action. In either case, the notice shall:

     (1) State where and when a demand for payment must be sent and certificates
for certificated shares must be deposited in order to obtain payment.

     (2) Inform  holders of  uncertificated  shares to what  extent  transfer of
shares will be restricted from the time that demand for payment is received.

     (3)  Supply a form for  demanding  payment  that  includes  a  request  for
certification  of the date on which  the  shareholder,  or the  person  on whose
behalf the shareholder dissents, acquired beneficial ownership of the shares.

     (4) Be accompanied by a copy of this subchapter.

     (b) Time for receipt of demand for payment.  -- The time set for receipt of
the demand and  deposit of  certificated  shares  shall be not less than 30 days
from the mailing of the notice.

     1576 FAILURE TO COMPLY WITH NOTICE TO DEMAND PAYMENT, ETC. -- (a) Effect of
failure of  shareholder  to act.  -- A  shareholder  who fails to timely  demand
payment,  or fails  (in the  case of  certificated  shares)  to  timely  deposit
certificates,  as required by a notice  pursuant to section  1575  (relating  to
notice to demand  payment)  shall not have any right  under this  subchapter  to
receive payment of the fair value of his shares.


                                       D-3

<PAGE>


     (b)  Restriction  on  uncertificated  shares.  -- If  the  shares  are  not
represented  by  certificates,  the  business  corporation  may  restrict  their
transfer  from the time of receipt of demand for payment until  effectuation  of
the proposed  corporate action or the release of restrictions under the terms of
section 1577(a) (relating to failure to effectuate corporate action).

     (c) Rights retained by shareholder. -- The dissenter shall retain all other
rights of a shareholder  until those rights are modified by  effectuation of the
proposed corporate action.

     1577  RELEASE OF  RESTRICTIONS  OR PAYMENT  FOR  SHARES.  -- (a) Failure to
effectuate  corporate  reaction.  --  Within  60 days  after  the  date  set for
demanding payment and depositing  certificates,  if the business corporation has
not effectuated the proposed  corporate action, it shall return any certificates
that have been  deposited  and release  uncertificated  shares from any transfer
restrictions imposed by reason of the demand for payment.

     (b) Renewal of notice to demand payment. -- When uncertificated shares have
been released from transfer  restrictions and deposited  certificates  have been
returned,  the corporation may at any later time send a new notice conforming to
the  requirements of section 1575 (relating to notice to demand  payment),  with
like effect.

     (c) Payment of fair value of shares. -- Promptly after  effectuation of the
proposed  corporate  action, or upon timely receipt of demand for payment if the
corporate  action has already been  effectuated,  the  corporation  shall either
remit to dissenters who have made demand and (if their shares are  certificated)
have deposited their  certificates the amount that the corporation  estimates to
be the fair value of the shares, or give written notice that no remittance under
this section will be made. The remittance or notice shall be accompanied by:

     (1) The closing  balance sheet and statement of income of the issuer of the
shares held or owned by the  dissenter for a fiscal year ending not more than 16
months  before  the date of  remittance  or  notice  together  with  the  latest
available interim financial statements.

     (2) A  statement  of the  corporation's  estimate  of the fair value of the
shares.

     (3)  A  notice  of  the  right  of  the  dissenter  to  demand  payment  or
supplemental  payment,  as  the  case  may be  accompanied  by a  copy  of  this
subchapter.

     (d)  Failure  to make  payment.  -- If the  corporation  does not remit the
amount of its estimate of the fair value of the shares as provided by subsection
(c),  it shall  return any  certificates  that have been  deposited  and release
uncertificated  shares from any transfer  restrictions  imposed by reason of the
demand for payment.  The corporation may make a notation on any such certificate
or on the records of the corporation relating to any such uncertificated  shares
that such demand has been made.  If shares with  respect to which  notation  has
been so made shall be transferred,  each new certificate  issued therefor or the
records relating to any transferred  uncertificated  shares shall bear a similar
notation,  together with the name of the original  dissenting holder or owner of
such shares.  A transferee of such shares shall not acquire by such transfer any
rights in the corporation other than those that the original dissenter had after
making demand for payment of their fair value.

     1578 ESTIMATE BY DISSENTER OF FAIR VALUE OF SHARES. -- (a) General rule. --
If the  business  corporation  gives notice of its estimate of the fair value of
the shares,  without remitting such amount, or remits payment of its estimate of
the fair value of a dissenter's shares as permitted by section 1577(c) (relating
to payment of fair value of shares) and the  dissenter  believes that the amount
stated or remitted is less than the fair value of his shares, he may send to the
corporation  his own  estimate of the fair value of the  shares,  which shall be
deemed a demand for payment of the amount or the deficiency.


                                       D-4

<PAGE>


     (b) Effect of failure to file  estimate.  -- Where the  dissenter  does not
file his own estimate  under  subsection (a) within 30 days after the mailing by
the corporation of its remittance or notice,  the dissenter shall be entitled to
no  more  than  the  amount  stated  in the  notice  or  remitted  to him by the
corporation.

     1579 VALUATION PROCEEDINGS GENERALLY. -- (a) General rule. --Within 60 days
after the latest of:

     (1) Effectuation of the proposed corporate action;

     (2) Timely  receipt of any demands for payment under section 1575 (relating
to notice to demand payment); or

     (3) Timely  receipt of any estimates  pursuant to section 1578 (relating to
estimate by dissenter of fair value of shares);

If any demands for payment remain unsettled,  the business  corporation may file
in court an application for relief  requesting that the fair value of the shares
be determined by the court.

     (b) Mandatory joinder of dissenters. -- All dissenters,  wherever residing,
whose demands have not been settled  shall be made parties to the  proceeding as
in an action against their shares. A copy of the application  shall be served on
each such dissenter. If a dissenter is a nonresident,  the copy may be served on
him in the manner  provided or  prescribed  by or pursuant to 42 Pa.C.S.  Ch. 53
(relating to bases of jurisdiction and interstate and international procedure).

     (c)  Jurisdiction of the court.  -- The  jurisdiction of the court shall be
plenary and  exclusive.  The court may appoint an appraiser to receive  evidence
and recommend a decision on the issue of fair value.  The  appraiser  shall have
such power and authority as may be specified in the order of  appointment  or in
any amendment thereof.

     (d) Measure of  recovery.  -- Each  dissenter  who is made a party shall be
entitled to recover the amount by which the fair value of his shares is found to
exceed the amount, if any, previously remitted, plus interest.

     (e)  Effect  of  corporation's  failure  to  file  application.  -- If  the
corporation  fails to file an  application  as provided in  subsection  (a), any
dissenter  who made a demand and who has not already  settled his claim  against
the corporation may do so in the name of the corporation any time within 30 days
after the  expiration  of the 60-day  period.  If a  dissenter  does not file an
application  within  the  30-day  period,  each  dissenter  entitled  to file an
application  shall be paid the  corporation's  estimate of the fair value of the
shares and no more, and may bring an action to recover any amount not previously
remitted.

     1580 COSTS AND EXPENSES OF VALUATION  PROCEEDINGS.  -- (a) General rule. --
The costs and  expenses  of any  proceeding  under  section  1579  (relating  to
valuation  proceedings  generally),  including the reasonable  compensation  and
expenses of the  appraiser  appointed by the court,  shall be  determined by the
court and assessed against the business  corporation except that any part of the
costs  and  expenses  may  be  apportioned  and  assessed  as  the  court  deems
appropriate  against  all or some of the  dissenters  who are  parties and whose
action in  demanding  supplemental  payment  under  section  1578  (relating  to
estimate by  dissenter  of fair value of shares) the court finds to be dilatory,
obdurate, arbitrary, vexatious or in bad faith.

     (b)  Assessment  of counsel  fees and expert  fees where lack of good faith
appears.  -- Fees and  expenses  of counsel  and of experts  for the  respective
parties may be assessed as the court deems  appropriate  against the corporation
and in  favor of any or all  dissenters  if the  corporation  failed  to  comply
substantially with the requirements of this subchapter and may be against either
the corporation or a dissenter, in favor of any other party,


                                       D-5

<PAGE>


if the  court  finds  that the  party  against  whom the fees and  expenses  are
assessed acted in bad faith or in a dilatory,  obdurate,  arbitrary or vexatious
manner in respect to the rights provided by this subchapter.

     (c) Award of fees for benefits to other  dissenters.  -- If the court finds
that the services of counsel for any dissenter  were of  substantial  benefit to
other dissenters  similarly  situated and should not be against the corporation,
it may  award to those  counsel  reasonable  fees to be paid out of the  amounts
awarded to the dissenters who were benefited.






                                       D-6

<PAGE>


                                   APPENDIX E

                                NBT BANCORP INC.
                          EMPLOYEE STOCK PURCHASE PLAN


                               ARTICLE I--PURPOSE

     The NBT Bancorp Inc.  Employee Stock Purchase Plan (the "Plan") is intended
to  provide  to  employees  of NBT  Bancorp  Inc.  (the  "Corporation")  and its
subsidiaries the opportunity to acquire  ownership  interests in the Corporation
through a regular investment program. The Corporation believes that ownership of
its Common Stock will motivate  employees to improve their job performance,  and
enhance  the  financial  results of the  Corporation.  The Plan is  intended  to
qualify as an "employee  stock  purchase plan" under section 423 of the Internal
Revenue Code of 1986, as amended (the  "Code"),  and shall be construed so as to
extend and limit  participation  in a manner  consistent  with the  requirements
thereof.


                             ARTICLE II--DEFINITIONS

2.01. BASE PAY

     "Base Pay" shall mean an Employee's basic hourly wage or salary,  excluding
any  bonuses,  overtime,  or other extra or incentive  pay.  With respect to any
Employee  compensated  on a commission  basis,  the Committee  shall make a good
faith  estimate of the  Employee's  expected  "Base Pay" by taking into  account
prior-year  compensation,  excluding  any bonuses,  overtime,  or other extra or
incentive pay, and any changes in circumstances for the current year.

2.02. BOARD

     "Board" shall mean the Board of Directors of the Corporation.

2.03. CODE

     "Code" shall mean the Internal  Revenue Code of 1986,  as amended from time
to time.

2.04. COMMENCEMENT DATE

     "Commencement Date" shall mean March 31, 2000 and each January 1 thereafter
during which the Plan is in effect.

2.05. COMMITTEE

     "Committee" shall mean the individuals described in Article IX.

2.06. COMMON STOCK

     "Common  Stock" shall mean the Common Stock,  par value $.01 per share,  of
the Corporation.

2.07. CORPORATION

     "Corporation" shall mean NBT Bancorp Inc., a Delaware corporation.

2.08. EMPLOYEE

     "Employee"  shall  mean  any  person  employed  by  the  Corporation  or  a
Subsidiary Corporation (as defined in ss. 2.10).


                                       E-1

<PAGE>


2.09. OFFERING

     "Offering"  shall mean an annual  offering of Common Stock  pursuant to ss.
4.01.

2.10. SUBSIDIARY CORPORATION

     "Subsidiary Corporation" shall mean any present or future corporation which
would be a "subsidiary  corporation"  of the Corporation as that term is defined
in section 424 of the Code.

2.11. TERMINATION DATE

     "Termination  Date" shall mean the December 31  immediately  following  the
Commencement Date of an Offering.


                   ARTICLE III--ELIGIBILITY AND PARTICIPATION

3.01. INITIAL ELIGIBILITY

     Except as otherwise  provided in ss.ss.  3.02 and 9.01, each Employee shall
be eligible to participate in Offerings that commence on or after the date he or
she becomes an Employee.

3.02. RESTRICTIONS ON PARTICIPATION

     No Employee shall participate in an Offering:

     (a) if,  immediately  after the Commencement  Date, such Employee would own
stock, and/or hold outstanding options to purchase stock,  possessing 5% or more
of the  total  combined  voting  power or value of all  classes  of stock of the
Corporation (for purposes of this paragraph,  the rules of section 424(d) of the
Code shall apply in determining stock ownership of any Employee); or

     (b) to the  extent  that his or her  rights  to  purchase  stock  under all
employee stock purchase plans of the Corporation  accrue at a rate which exceeds
$25,000 in fair market value of the stock  (determined  at the time such options
are granted) for each calendar year in which such options are outstanding.

3.03. COMMENCEMENT OF PARTICIPATION

     An Employee may participate in Offerings by completing an authorization for
regular payroll deductions on the form provided by the Corporation and filing it
with the Corporation on or before the date set therefor by the Committee,  which
date shall be prior to the Commencement Date for an Offering. Payroll deductions
for an  Employee  shall  commence  on the  applicable  Commencement  Date.  Once
en-rolled,  an Employee  shall  continue to  partici-pate  in this Plan for each
succeed-ing  Offering until the Employee  termi-nates his or her partici-pa-tion
as provided in Article VII or ceases to be an Employee.  An Employee who desires
to  change  his or her  rate  of  contribu-tion  may do so  effective  as of the
beginning  of the  next  Commencement  Date for an  Offering  by  completing  an
authorization  and  filing it with the  Corporation  prior to that  Commencement
Date.


                         ARTICLE IV--GRANTING OF OPTIONS

4.01. ANNUAL OFFERINGS

     The Plan shall be implemented by annual offerings of Common Stock beginning
on March 31, 2000 and on the 1st day of January in each  subsequent  year,  each
Offering  terminating on the December 31 immediately  following the Commencement
Date (the Termination Date).

4.02. NUMBER OF OPTION SHARES

     On the Commencement Date of each Offering,  a participating  Employee shall
be deemed  to have been  granted  an  option to  purchase  a number of shares of
Common Stock equal to (i) the aggregate amount of payroll  deductions during the
Offering  elected by the Employee,  divided by (ii) the option price  determined
under ss. 4.03(i).


                                       E-2

<PAGE>


4.03. OPTION PRICE

     The option  price of Common  Stock  purchased  in an Offering  shall be the
lower of:

     (i) 85% of the fair market value of Common Stock on the Commencement  Date,
or

     (ii) 85% of the fair market value of Common Stock on the Termination  Date.
Fair market value as of any date shall mean:

     (a) if the Common  Stock is listed on a  national  securities  exchange  or
traded in the  over-the-counter  market and sales prices are regularly  reported
for the Common  Stock,  the  average of the closing or last prices of the Common
Stock on the  Composite  Tape or other  comparable  reporting  system for the 10
consecutive trading days immediately preceding such date;

     (b) if the Common Stock is traded on the over-the-counter market, but sales
prices are not regularly  reported for the Common Stock for the 10 days referred
to in (a) above,  and if bid and asked prices for the Common Stock are regularly
reported,  the  average of the mean  between the bid and the asked price for the
Common Stock at the close of trading in the over-the-counter  market for such 10
days; and

     (c) if the Common Stock is neither listed on a national securities exchange
nor traded on the over-the-counter  market, such value as the Committee, in good
faith, shall determine.

4.04. MAXIMUM SHARES

     The maximum number of shares which shall be issued under the Plan,  subject
to adjustment upon changes in  capitalization  of the Corporation as provided in
ss.  11.02,  shall be 500,000  shares.  If the total  number of shares for which
options are  exercised  on any  Offering  Termination  Date,  together  with the
aggregate  number of shares as to which  options were  exercised on all previous
Offering  Termination Dates, exceeds the foregoing maximum number of shares, the
Corporation  shall  make a pro  rata  allocation  of the  shares  available  for
purchase in as nearly a uniform manner as shall be  practicable  and as it shall
determine  to be  equitable,  and the  balance  credited  to the account of each
Employee  under ss. 5.02 not used to purchase  Common Stock shall be returned to
him or her as promptly as possible. Common Stock issued pursuant to the Plan may
be either  authorized but unissued  shares or shares held in the treasury of the
Corporation.

4.05. EMPLOYEE'S INTEREST IN OPTION STOCK

     The Employee  shall have no interest in Common Stock  covered by his or her
option until such option has been exercised in accordance with the provisions of
Article VI.


                          ARTICLE V--PAYROLL DEDUCTIONS

5.01. AMOUNT OF DEDUCTION

     An Employee's authorization for payroll deduction shall elect deductions of
at least 1% of Base Pay,  but not more  than 10% of Base  Pay,  in effect on the
Commencement  Date  of  each  Offering.  No  change  in the  amount  of  payroll
deductions  shall  be made  during  a year if the  Employee's  rate of Base  Pay
changes during the year.

5.02. EMPLOYEE'S ACCOUNT

     All payroll deductions made for an Employee shall be credited to his or her
account  under the Plan. An Employee may not make any separate cash payment into
such account  except when on leave of absence,  and then only as provided in ss.
5.04.

5.03. CHANGES IN PAYROLL DEDUCTIONS

     An Employee may discontinue his or her payroll deductions under the Plan as
provided in Article VII, but may make no other  change  during an Offering  and,
specifically, may not alter the amount of his or her payroll deductions for that
Offering.

                                       E-3

<PAGE>


5.04. LEAVE OF ABSENCE

     An Employee  on a leave of absence  without pay shall have the right to (i)
discontinue  contributions  to the  Plan,  or (ii)  make a cash  payment  to the
Corporation  at the end of each payroll  period in the amount of the  Employee's
authorized Plan deductions.


                         ARTICLE VI--EXERCISE OF OPTIONS

6.01. AUTOMATIC EXERCISE

     Unless an Employee gives written  notice to the  Corporation as hereinafter
provided,  his or her option with  respect to any  Offering  shall be  exercised
automatically  on the  Termination  Date  applicable to such  Offering,  for the
number  of full and  fractional  shares of Common  Stock  subject  to his or her
option,  as determined under ss. 4.02. Any amount in his or her account not used
to purchase  Common Stock shall be returned to the Employee within a reason-able
time after the Termination Date of the Offering.

6.02. BOOK ENTRY ACCOUNTS; DELIVERY OF STOCK

     The  Corporation  shall maintain a book entry account,  in the name of each
Employee who  purchased  shares of Common  Stock under ss. 6.01,  to record book
entries of the number of full and  fractional  shares (to 1/1,000 of a share) of
Common  Stock  purchased  by an  Employee.  Statements  of  shares  held in each
Employee's  book entry account  shall be  deliv-ered  to each Employee  within a
reason-able time after the Termination Date of each Offering. Shares credited to
an  Employee's  book entry  account  will be held in  uncertificated  form for a
period of one year from the date of purchase,  except as provided in ss.ss. 6.04
and 7.03.  Thereafter,  Employees may obtain stock certificates for those shares
that have been held for one year in their  respective  book entry  accounts upon
submitting a written request to the Committee.

6.03. REGISTRATION OF STOCK

     Common  Stock to be  delivered  to an  Employee  under  the  Plan  shall be
registered  in the name of the  Employee,  or, if the  Employee  so  directs  by
written  notice  to the  Corporation  prior  to the  Offering  Termination  Date
applicable  thereto,  in the names of the  Employee and one such other person as
may be designated by the Employee,  as joint tenants with rights of survivorship
or as tenants by the entirety, to the extent permitted by applicable law.

6.04. TRANSFERABILITY OF STOCK

     Common Stock issued pursuant to the Plan shall not be  transferable,  other
than to the  Employee's  estate or by bequest or  inheritance,  incident  to the
Employee's divorce, or due to the Employee's immediate and heavy financial need,
for one year after the date of purchase.

     Stock  certificates  representing  those  shares  that have been held in an
Employee's  book entry  account for less than one year from the date of purchase
will be issued to an Employee due to an immediate  and heavy  financial  need of
the  Employee if the  Employee  has  incurred  (or is about to incur) any of the
following financial obligations:

     (i)  Expenses  incurred or  necessary  for medical  care  described in Code
     section  213(d) for the  Employee,  his or her  spouse,  children  or other
     dependents;

     (ii) Costs directly related to the purchase of the principal  residence for
     the Employee(excluding mortgage payments);

     (iii)  Payment of tuition,  related  educational  fees,  and room and board
     expenses,  for the next twelve (12) months of post-secondary  education for
     the Employee, his or her spouse, children or other dependents; or

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<PAGE>


     (iv) Payments necessary to prevent the eviction of the Employee from his or
     her  principal  residence  or  foreclosure  on the  mortgage  of his or her
     principal residence.

     A financial  hardship request for stock  certificates  must be submitted to
the Committee in writing.  The Employee  making the  application  shall have the
burden of presenting  to the Committee  evidence that he or she has an immediate
and  heavy  financial  need and  that the  issuance  of stock  certificates  and
subsequent  sale of those  shares of Common  Stock is  necessary to satisfy that
financial need. Action upon any such application shall be taken by the Committee
in its absolute discretion.

6.05. WITHHOLDING

     The  Corporation  shall  have the  right  to  withhold  from an  Employee's
compensation  amounts  sufficient  to satisfy all  federal,  state and local tax
withholding  requirements,  and shall have the right to require the  Employee to
remit to the Corporation such additional  amounts as may be necessary to satisfy
such requirements.


                             ARTICLE VII--WITHDRAWAL

7.01. IN GENERAL

     An Employee  may  withdraw  the full amount  credited to his or her account
under the Plan at any time by giving  written  notice  to the  Corporation.  The
balance credited to the Employee's  account shall be paid to him or her promptly
after receipt of the notice of withdrawal,  and no further  deductions  shall be
made from his or her pay during such Offering.

7.02. EFFECT ON SUBSEQUENT PARTICIPATION

     An Employee's  withdrawal  from any Offering shall not have any effect upon
his or her eligibility to participate in any succeeding  Offering by filing with
the Corporation a new authorization for payroll deduction.

7.03. TERMINATION OF EMPLOYMENT

     Upon  termination  of an Employee's  employment  for any reason,  including
retirement  (but excluding  death while in the employ of the  Corporation),  the
amount credited to his or her account shall be returned to him or her or, in the
case of death  subsequent to the  termination of his or her  employment,  to the
person or persons entitled thereto under ss. 11.08.  Certificates for the number
of full shares of Common Stock  allocated to a terminated  Employee's book entry
account  shall be issued to him or her as promptly as  practicable  after his or
her termination date, with any fractional shares paid in cash.

7.04. TERMINATION OF EMPLOYMENT DUE TO DEATH

     Upon termination of an Employee's  employment  because of his or her death,
his or her  beneficiary (as defined in ss. 11.08) shall have the right to elect,
by written  notice given to the  Corporation  prior to the Offering  Termination
Date, either:

     (i) to withdraw the amount  credited to the  Employee's  account  under the
Plan, or

     (ii) to exercise his or her option on the  Termination  Date next following
the date of the Employee's death for the number of full and fractional shares of
Common  Stock  which  the  Employee's  payroll  deductions  prior to death  will
purchase at the applicable  option price, but not more than the number of shares
subject to the Employee's  option  determined under ss. 4.02, with any amount in
such account not used to purchase Common Stock returned to the beneficiary.

     In the  event  that no such  timely  written  notice of  election  shall be
received by the Corporation,  the beneficiary  shall  automatically be deemed to
have elected, pursuant to paragraph (ii), to exercise the Employee's option.

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<PAGE>


                             ARTICLE VIII--INTEREST

8.01. PAYMENT OF INTEREST

     No  interest  shall be paid or  allowed  on any money paid into the Plan or
credited to the account of any Employee;  provided, however, that interest shall
be paid on any and all money which is  distributed  to an Employee or his or her
beneficiary  pursuant to the  provisions  of ss.ss.  7.01,  7.03 and 7.04.  Such
distributions  shall bear  simple  interest  during the period  from the date of
withholding to the date of return at the regular  passbook  savings account rate
per annum in  effect at NBT Bank,  N.A.,  Norwich,  New York.  Where the  amount
returned represents an excess amount in an Employee's account after such account
has been applied to the purchase of Common Stock under ss. 6.01,  the Employee's
withholding  account shall be deemed to have been applied first toward  purchase
of  Common  Stock  under the Plan,  so that  interest  shall be paid on the last
withholdings during the period which results in the excess amount.


                           ARTICLE IX--ADMINISTRATION

9.01. APPOINTMENT OF COMMITTEE

     The  Board  shall  appoint  the  Compensation  and  Benefits  Committee  to
administer  the Plan,  which  shall  consist of no fewer than two members of the
Board.  No members of the Committee  shall be eligible to purchase  Common Stock
under the Plan.  If at any time no  Committee is in  existence,  the Board shall
have the authority and  responsibility  to carry out the duties of the Committee
under the Plan.

9.02. AUTHORITY OF COMMITTEE

     Subject to the express  provisions of the Plan,  the  Committee  shall have
plenary  authority  in its  discretion  to  interpret  and  construe any and all
provisions of the Plan, to adopt rules and  regulations  for  administering  the
Plan,  to make all  other  determinations  deemed  necessary  or  advisable  for
administering  the Plan. The Committee's  determination on the foregoing matters
shall be conclusive.

9.03. RULES GOVERNING THE COMMITTEE

     The  Board  may from  time to time  appoint  members  of the  Committee  in
substitution  for or in addition to members  previously  appointed  and may fill
vacancies, however caused, in the Committee. The Committee may select one of its
members as its  Chairman and shall hold its meetings at such times and places as
it shall deem  advisable,  and may hold telephonic  meetings.  A majority of its
members shall constitute a quorum.  All determinations of the Committee shall be
made by a majority  of its  members.  The  Committee  may  correct any defect or
omission or reconcile  any  inconsistency  in the Plan, in the manner and to the
extent it shall deem desirable. Any decision or determination reduced to writing
and  signed by a majority  of the  members  of the  Committee  shall be as fully
effective as if it had been made by a majority vote at a meeting duly called and
held.  The  Committee  may  appoint a  secretary  and shall  make such rules and
regulations for the conduct of its business as it shall deem advisable.


                     ARTICLE X--INDEMNIFICATION OF COMMITTEE

10.01. INDEMNIFICATION OF COMMITTEE

     In addition  to such other  rights of  indemnification  as they may have as
directors or as members of the Committee,  the members of the Committee shall be
indemnified  by the  Corporation  against  the  reasonable  expenses,  including
attorneys' fees actually and necessarily incurred in connection with the defense
of any action, suit or proceeding,  or in connection with any appeal therein, to
which  they or any of them  may be a party  by  reason  of any  action  taken or
failure  to act  under or in  connection  with the  Plan or any  option  granted
thereunder, and against all amounts paid by them in settlement thereof (provided
such  settlement  is  approved  by  independent  legal  counsel  selected by the
Corporation)  or paid by them in  satisfaction of a judgment in any such action,
suit or  proceeding,  except  in  relation  to  matters  as to which it shall be
adjudged in such action, suit or proceeding that


                                       E-6

<PAGE>


such Committee  member is liable for negligence or misconduct in the performance
of his or her duties;  provided that within sixty (60) days after institution of
any such action,  suit or proceeding,  a Committee member shall in writing offer
the Corporation the  opportunity,  at its own expense,  to handle and defend the
same.


                            ARTICLE XI--MISCELLANEOUS

11.01. TRANSFERABILITY

     Neither payroll deductions credited to an Employee's account nor any rights
with regard to the exercise of an option or to receive  Common Stock or a return
of payroll deductions under the Plan may be assigned,  transferred,  pledged, or
otherwise  disposed  of in any  way  other  than  by the  laws  of  descent  and
distribution, nor shall be subject to execution,  attachment or similar process.
Any such attempted voluntary or involuntary disposition shall be without effect,
except that the  Corporation may treat such act as an election to withdraw funds
in accordance with ss. 7.01. During an Employee's  lifetime,  options granted to
the Employee shall be exercisable only by the Employee.

11.02. ADJUSTMENT UPON CHANGES IN CAPITALIZATION

     If,  while any  options  under the Plan are  outstanding,  the  outstanding
shares  of  Common  Stock  have  increased,  decreased,  changed  into,  or been
exchanged  for a  different  number  or  kind of  shares  or  securities  of the
Corporation,    or   of    another    corporation,    through    reorganization,
recapitalization,   reclassification,  merger,  consolidation,  spin-off,  stock
dividend (either in shares of the Corporation's Common Stock or of another class
of the Corporation's  stock), stock split, or similar  transaction,  appropriate
and proportionate  adjustments may be made by the Committee in the number and/or
kind of shares which are subject to purchase  under  outstanding  options and in
the exercise price applicable to such outstanding  options. In addition,  in any
such  event,  the  number  and/or  kind of shares  which may be  offered  in the
Offerings shall also be proportionately adjusted.

11.03. AMENDMENT AND TERMINATION

     The Board shall have complete power and authority to terminate or amend the
Plan; provided,  however,  that the Board shall not, without the approval of the
stockholders of the Corporation, (i) increase the maximum number of shares which
may be issued under the Plan (except  pursuant to ss. 11.02);  or (ii) amend the
requirements  as to the class of  Employees  eligible to purchase  Common  Stock
under the Plan or permit the members of the Committee or non-employee  directors
to  purchase  Common  Stock under the Plan.  No  termination,  modification,  or
amendment  of the Plan may,  without the  consent of an Employee  then having an
option under the Plan to purchase Common Stock,  adversely  affect the rights of
such Employee under the option as to payroll deductions  previously  credited to
the  Employee's  account.  The Plan shall not be amended  more than once every 6
months, other than to comport with changes in the Code or the rules thereunder.

11.04. USE OF FUNDS

     All payroll deductions  received or held by the Corporation under this Plan
may be used by the  Corporation  for any corporate  purpose and the  Corporation
shall not be obligated to segregate such payroll deductions.

11.05. EFFECTIVE DATE

     The Plan shall become  effective as of March 31, 2000,  subject to approval
by the holders of a majority of the Common Stock  present and  represented  at a
special or annual  meeting of the  shareholders  held within 12 months after the
Plan is adopted by the Board. If the Plan is not so approved, the Plan shall not
become  effective,  and all account balances under the Plan shall be distributed
promptly to the contributing Employees.

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<PAGE>


11.06. NO EMPLOYMENT RIGHTS

     The Plan does not, directly or indirectly,  create in any Employee or class
of  Employees  any right  with  respect to  continuation  of  employment  by the
Corporation,  and it  shall  not be  deemed  to  interfere  in any way  with the
Corporation's right to terminate,  or otherwise modify, an Employee's employment
at any time.

11.07. GOVERNING LAW

     The laws of the State of  Delaware,  without  regard to  conflicts  of laws
principles,  shall govern all matters relating to this Plan except to the extent
they are superseded by federal law.

11.08. DESIGNATION OF BENEFICIARY

     An  Employee  may file a written  designation  of a  beneficiary  who is to
receive any Common Stock and/or cash credited to the Employee under this Plan in
the event of such  Employee's  death prior to the delivery to him or her of such
Common Stock and/or cash. Such  designation of beneficiary may be changed by the
Employee at any time by written notice to the Treasurer of the Corporation. Upon
the  death  of an  Employee  and upon  receipt  of the  Corporation  of proof of
identity  and  existence  at  the  Employee's  death  of a  beneficiary  validly
designated  by him or her under the Plan,  the  Corporation  shall  deliver such
Common  Stock and/or cash to such  beneficiary.  In the event of the death of an
Employee and in the absence of a beneficiary  validly  designated under the Plan
who is  living  at the time of such  Employee's  death,  the  Corporation  shall
deliver such Common Stock  and/or cash to the executor or  administrator  of the
estate  of the  Employee,  or if no such  executor  or  administrator  has  been
appointed (to the knowledge of the  Corporation),  the Corporation,  in its sole
discretion,  may deliver  such Common  Stock and/or cash to the spouse or to any
one or more dependents or relatives of the Employee, or if no spouse, dependent,
or  relative  is known to the  Corporation,  then to such  other  person  as the
Corporation may designate.  No designated  beneficiary shall, prior to the death
of the Employee by whom he or she has been  designated,  acquire any interest in
the Common Stock or cash credited to the Employee under this Plan.

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