NBT BANCORP INC
S-4, 2000-02-23
NATIONAL COMMERCIAL BANKS
Previous: MGM GRAND INC, 8-K/A, 2000-02-23
Next: ROYAL LONDON MUTUAL INSURANCE SOCIETY LTD, 13F-HR, 2000-02-23




     As filed with the Securities and Exchange Commission on February 23, 2000

                         Registration Statement No. 333-

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

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                    FORM S-4
                             REGISTRATION STATEMENT
                        UNDER THE SECURITIES ACT OF 1933

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

                                NBT BANCORP INC.
             (Exact Name of Registrant as specified in its Charter)

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

DELAWARE                            6712                        16-1268674

(State or Other          (Primary Standard Industrial        (I.R.S. Employer
Jurisdiction of          Classification Code Number)         Identification No.)
Incorporation
or Organization)


                              52 South Broad Street
                             Norwich, New York 13815
                                 (607) 337-2265
          (Address, Including Zip Code, and Telephone Number, Including
             Area Code of Registrant's Principal Executive Offices)

                                DARYL R. FORSYTHE
                      President and Chief Executive Officer
                                NBT Bancorp Inc.
                              52 South Broad Street
                             Norwich, New York 13815
                                 (607) 337-2265
                (Name, Address, Including Zip Code, and Telephone
               Number, Including Area Code, of Agent for Service)

<PAGE>

                                 Copies to:

Brian D. Alprin, Esq.                          Lawrence R. Wiseman, Esq.
Laurence S. Lese, Esq.                         Blank Rome Comisky & McCauley LLP
Duane, Morris & Heckscher LLP                  One Logan Square
1667 K Street, NW, Suite 700                   Philadelphia, PA 19103-6998
Washington, DC 20006                           (215) 569-5500
(202) 776-7800


         Approximate  date of  commencement  of proposed sale to the public:  As
soon as practicable after the registration  statement is declared  effective and
all of the conditions to the proposed merger of Pioneer American Holding Company
Corp.  with and into NBT Bancorp  Inc.,  as is described  in the enclosed  joint
proxy statement/prospectus.

         If the  securities  being  registered on this Form are being offered in
connection  with the formation of a holding company and there is compliance with
General Instruction G, check the following box. [_]

         If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the  Securities  Act,  check the following box and
list the Securities Act registration  statement number of the earlier  effective
registration statement for the same offering. [_]

         If this  form is a  post-effective  amendment  filed  pursuant  to Rule
462(d) under the Securities Act, check the following box and list the Securities
Act  registration   statement  number  of  the  earlier  effective  registration
statement for the same offering. [_]

<TABLE>
<CAPTION>

                                          CALCULATION OF REGISTRATION FEE


Title of Each Class of                          Proposed Maximum
Securities to be         Amount to be           Offering Price Per     Maximum Aggregate      Amount of
Registered               Registered (1)         Unit                   Offering Price (4)     Registration Fee


<S>                      <C>                    <C>                    <C>                    <C>
Common Stock,            5,200,000 (2)          (3)                    $63,372,792            $16,731
$.01 par value per
share
</TABLE>

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

(1)      This  registration  statement also relates to such additional number of
         shares of the Registrant's  common stock as may be issuable as a result
         of a stock dividend,  stock split, split-up,  recapitalization or other
         similar event.

(2)      Represents the estimated maximum number of shares of NBT common stock,
         $.01 par value per share to be issued to stockholders of Pioneer
         American in connection with the merger.

(3)      Not applicable.

(4)      Estimated solely for the purpose of calculating the registration fee in
         accordance with Rule 457(f)(1) and based on the average of the bid and
         asked price per share of Pioneer  American common stock,  par value
         $1.00 per share, on February 18, 2000 on the Nasdaq Bulletin Board,
<PAGE>

         multiplied by an aggregate of 2,864,307 shares of Pioneer American
         common stock to be acquired by NBT.



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


         The Registrant hereby amends this  registration  statement on such date
or dates as may be necessary to delay its  effective  date until the  Registrant
shall file a further amendment which specifically  states that this registration
statement shall  thereafter  become effective in accordance with Section 8(a) of
the Securities  Act of 1933, as amended,  or until this  registration  statement
shall become  effective on such date as the Securities and Exchange  Commission,
acting pursuant to said Section 8(a), may determine.

<PAGE>

[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:

April 25, 2000 at 10:00 a.m. local time  April 25, 2000 at 10:00 a.m. local time
The Binghamton Regency Hotel             Heart Lake Lodge
and Conference Center                    1299 Heart Lake Road
225 Water Street, One Sarbro Square      Jermyn, Pennsylvania
Binghamton, New York

         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.


/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              , 2000, and first
mailed to stockholders on or about             , 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 Binghamton Regency Hotel and Conference Center, 225 Water
Street, One Sarbro Square,  Binghamton, New York on April 25, 2000 at 10:00 a.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 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,  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:

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

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

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

         4.   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 , 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,  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  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.


                                           Daryl R. Forsythe
                                           President and Chief Executive Officer

Norwich, New York
                , 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 April 25, 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, 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 , 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


                                           John W. Reuther
                                           President and Chief Executive Officer

Carbondale, Pennsylvania
                , 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>
<CAPTION>

                                TABLE OF CONTENTS

                                                                                                              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
              Voting Your Shares.................................................................................28
              How Proxies Are Counted............................................................................28
              Changing Your Vote.................................................................................29
              Independent Auditors to Be Present at the Annual Meeting...........................................29
              Solicitation of Proxies and Costs..................................................................29


                                       5
<PAGE>
              Recommendations of NBT Board.......................................................................29
              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................................................................30
              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.......................................................................................................32
         ELECTION OF DIRECTORS...................................................................................32
         Board Meetings and Committees of the Board..............................................................36
              Nominating, Organization and Board Affairs Committee:..............................................36
              Compensation and Benefits Committee................................................................37
              Audit, Compliance and Loan Review Committee........................................................37
         Section 16(a) Beneficial Ownership Reporting Compliance.................................................37
         Compensation of Directors and OfficersBoard of Directors Fees...........................................37
              Executive Compensation.............................................................................38
              Option Grants Information..........................................................................39
              Aggregate Option Exercises in Last Fiscal Year and Fiscal Year-End Option Values...................39
              Retirement Plan....................................................................................40
              Employment Contracts and Termination of Employment ................................................41
              Change In Control Contracts........................................................................41
              Supplemental Retirements Benefits..................................................................42
              Daryl R. Forsythe Employment.......................................................................42
              Compensation Committee Interlocks and Insider Participation........................................42
              Compensation Committee Report On Executive Compensation............................................43
              Members of the Compensation and Benefits Committee.................................................45
              401(k) and Employee Stock Ownership Plan...........................................................45
              Stock Option Plan..................................................................................46
              Federal Income Tax Consequences....................................................................47
              Executive Incentive Compensation Plan..............................................................48
              Personal Benefits..................................................................................48
              Related Party Transactions ........................................................................49
              Performance Graph..................................................................................49

PROPOSAL 2.......................................................................................................50
         PROPOSAL TO RATIFY THE BOARD OF DIRECTORS ACTION IN SELECTION OF KPMG LLP AS NBT'S INDEPENDENT AUDITOR..50

PROPOSAL 3.......................................................................................................51
         THE ISSUANCE OF NBT COMMON STOCK IN THE MERGER AND RATIFICATION OF THEMERGER AGREEMENT .................51
              General............................................................................................51
              Background of the Merger...........................................................................51
              Recommendation of the NBT Board and NBT's Reasons for the Stock Issuance and the Merger............54
              Recommendation of NBT's Board of Directors.........................................................56
              Recommendation of the Pioneer American Board and Pioneer American Reasons for the Merger...........56
              Recommendation of Pioneer American's Board of Directors............................................57
              Merger Consideration...............................................................................57
              Opinion of NBT's Financial Advisor.................................................................58


                                       6
<PAGE>
              Lake Ariel Transaction.............................................................................61
              Compensation of MB&D...............................................................................63
              Opinion of Pioneer American's Financial Advisor....................................................64
              Other Interests of Officers and Directors in the Merger............................................68
              Stock Option Agreement.............................................................................71
              Accounting Treatment...............................................................................74
              Dissenters' or Appraisal Rights....................................................................75
              Inclusion of NBT's Common Stock on Nasdaq National Market..........................................75
              Dividends..........................................................................................75
              Exchange of Pioneer American Certificates..........................................................75
              Pioneer American Stock Options.....................................................................76
              Representations and Warranties.....................................................................76
              Conduct of Business Pending Completion of the Merger...............................................77
              Conditions to Complete the Merger..................................................................80
              Termination and Termination Fees ..................................................................81
              Amendment and Waiver...............................................................................83
              Survival of Certain Provisions.....................................................................83
              Restrictions on Resales by Affiliates..............................................................84
              Fees for Financial Advisory Services...............................................................84
              Allocation of Costs and Expenses...................................................................85

THE COMPANIES....................................................................................................85
              NBT Bancorp Inc....................................................................................85
              Pioneer American Holding Company Corp..............................................................86
              NBT Following the Merger...........................................................................86

REGULATION AND SUPERVISION.......................................................................................86
              Support of Subsidiary Banks........................................................................87
              Liability of Commonly Controlled Banks.............................................................88
              Depositor Preference Statute.......................................................................88
              Capital Requirements...............................................................................88
              Brokered Deposits..................................................................................90
              Dividend Restrictions..............................................................................90
              Deposit Insurance Assessments......................................................................90
              Interstate Banking and Branching...................................................................91
              Control Acquisitions...............................................................................91
              Financial Modernization............................................................................92
              Future Legislation.................................................................................92

MATERIAL FEDERAL INCOME TAX CONSEQUENCES.........................................................................92

PRICE RANGE OF COMMON STOCK AND DIVIDENDS........................................................................93

DESCRIPTION OF NBT CAPITAL STOCK ................................................................................94
              Authorized Capital Stock...........................................................................94
              Common Stock.......................................................................................95
              Preferred Stock....................................................................................95
              Stockholder Rights Plan............................................................................95
              Registrar and Transfer Agent.......................................................................96

COMPARISON OF STOCKHOLDERS' RIGHTS...............................................................................96
              Special Meetings of Stockholders...................................................................99
              Inspection of Voting List of Stockholders..........................................................99
              Cumulative Voting.................................................................................100
              Preemptive Rights.................................................................................100
              Classification of the Board of Directors..........................................................100


                                       7
<PAGE>
              Election of the Board of Directors................................................................100
              Removal of Directors..............................................................................100
              Additional Directors and Vacancies on the Board of Directors......................................100
              Liability of Directors............................................................................101
              Indemnification of Directors, Officers, Employees and Agents......................................101
              Restrictions upon Certain Business Combinations...................................................102
              Mergers, Share Exchanges or Asset Sales...........................................................104
              Amendments to Certificate and Articles of Incorporation...........................................104
              Amendments to Bylaws..............................................................................105
              Appraisal/Dissenters' Rights......................................................................105

RIGHTS OF DISSENTING STOCKHOLDERS...............................................................................106
              Step One - Notice of Intention to Dissent.........................................................106
              Step Two - Notice to Demand Payment...............................................................106
              Step Three - Failure to Comply with the Notice to Demand Payment..................................106
              Step Four - Payment of Fair Value of Pioneer American Shares......................................106
              Step Five - Estimate by Dissenter of Fair Value of Shares.........................................107
              Step Six - Valuation Proceedings..................................................................107

OTHER MATTERS...................................................................................................108
              Stockholder Proposals for Annual Meetings.........................................................108
              Other Matters.....................................................................................108

LEGAL MATTERS...................................................................................................108

EXPERTS.........................................................................................................108

WHERE YOU CAN FIND MORE INFORMATION.............................................................................109
              NBT Bancorp Inc. SEC Filings......................................................................109
              Pioneer American Holding Company Corp. SEC Filings................................................109

UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS ..............................................................110

NOTES TO UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS......................................................124

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS.......................................................127
</TABLE>

Appendix A -- Agreement and Plan of Merger

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


                                       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 109.


                                   THE MERGER

WHAT PIONEER AMERICAN STOCKHOLDERS WILL RECEIVE AS A RESULT OF THE MERGER
(SEE PAGE 57)

         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:

         |X|      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

         |X|      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 75).

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 75)

         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 75)

         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 96)

         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.

<TABLE>
<CAPTION>


                    NBT BANCORP INC.                                 PIONEER AMERICAN HOLDING COMPANY CORP.

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

Under NBT's bylaws, NBT stockholders have the right         Under Pioneer American's bylaws, special meetings of
to call a special stockholders' meeting at the written      the shareholders may be called at any time by the
request of at least 50% of all shares entitled to           Board of Directors or by any three or more
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 Delaware law limit   The Pioneer American Articles of Incorporation require
the ability of a Delaware corporation to enter into a       a 70% vote of the stockholders to approve any merger
business combination with an interested stockholder and     or consolidation, liquidation or dissolution, or any
require an 80% vote of the outstanding NBT shares to        sale or other disposition of all or substantially all
accomplish such transactions.                               of the assets of the corporation.  Moreover,
                                                            Pennsylvania law restricts business combinations with
                                                            interested stockholders.

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

                                       10
<PAGE>

TRANSACTION GENERALLY TAX-FREE TO PIONEER AMERICAN STOCKHOLDERS (SEE PAGE 92)

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 75 AND
105)

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 86)

         In connection with the merger and subject to the fiduciary duties of
its directors to NBT, NBT will increase the size of its board of directors  from
twelve directors to fifteen directors.  The present NBT Board will appoint three
individuals who are presently  directors of Pioneer American to 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 93)

         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 , 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:

                                        DECEMBER 7, 1999                  , 2000
                                        ----------------       -----------------

NBT.................................        $16.25                  $
Pioneer American ...................        $27.75                  $
Equivalent Market Value Per
    Share of Pioneer American ......        $29.33                  $


                                       11
<PAGE>

         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 58 AND 64)

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 74)

         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 51)

         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:

         |X|      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

         |X|      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

         |X|      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

         |X|      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


                                       12
<PAGE>

         To review the NBT Board's reasons for the merger in greater detail, see
page 54.

Pioneer American.  We recommend the merger because:

         |X|      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

         |X|      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

         |X|      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 56.

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 54 AND 56)

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 68)

         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:

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

         |X|      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");

         |X|      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;

         |X|      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


                                       13
<PAGE>

         |X|      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 80)

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

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

         |X|      approval of the proposed merger by Pioneer American
                  stockholders;

         |X|      approval by government regulators;

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

         |X|      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

         |X|      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 83)

         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 80)

         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:

         |X|      the merger is not completed by July 31, 2000;

         |X|      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

         |X|      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 71)

                                       14
<PAGE>

         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 [NOT YET] 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. As of the date
of this document,  we have not yet received the required approvals.  While we do
not  know  of any  reason  why we  would  not be able to  obtain  the  necessary
approvals in a timely manner,  we cannot be certain when or if we will get them.
[THE  FEDERAL  RESERVE  BOARD  APPROVED THE MERGER ON , 2000.  THE  PENNSYLVANIA
DEPARTMENT OF BANKING APPROVED THE MERGER ON , 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.  In fiscal year 1999,
NBT's net income was $18.4 million  while in fiscal year 1998,  NBT's net income
was  $19.1  million.   As  of  December  31,  1999,   NBT's  total  assets  were
approximately  $1.4 billion,  total deposits were approximately $1.1 billion and
stockholders' equity was approximately $126.5 million. 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.  In fiscal year 1999, Lake
Ariel's net income was $3.8  million and in fiscal year 1998,  Lake  Ariel's net
income was $3.8 million. As of December 31, 1999, Lake Ariel's total assets were
approximately  $567.8 million,  total deposits were approximately $369.5 million
and stockholders'  equity was approximately  $33.3 million. We enclose with this
joint proxy  statement/prospectus a copy of NBT's annual report on SEC Form 10-K
for the year ended December 31, 1999.

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 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.


                                       15
<PAGE>

                           THE STOCKHOLDERS' MEETINGS

NBT. NBT will hold its annual meeting of stockholders at the Binghamton  Regency
Hotel and Conference Center,  225 Water Street,  One Sarbro Square,  Binghamton,
New York on April 25, 2000 at 10:00 a.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;
                  and

         3.       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:

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

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

                  |X|      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;

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

                  |X|      Following  the merger,  the NBT Board will expand the
                           NBT  Board  from  twelve  to  fifteen  members,  and,
                           subject to the  fiduciary  duties of its directors to
                           NBT, will elect or appoint three  directors  from the
                           current Pioneer American Board to the NBT Board.

                  Only  holders  of record of NBT  common  stock at the close of
business on , 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  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  5.96% 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.  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


                                       16
<PAGE>

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 April 25,
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 , 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:

         |X|      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;

         |X|      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

         |X|      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.


                                       17
<PAGE>

                             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  selected  unaudited  pro  forma  combined
financial data for the combined  company  include  financial data for Lake Ariel
Bancorp,  Inc.  We have  derived the  selected  historical  financial  data from
consolidated financial statements of NBT and Pioneer American,  which statements
we have  incorporated  by reference into this document.  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 110 through  126. 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  information  does not  reflect  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>

<TABLE>
<CAPTION>

NBT BANCORP INC.
SELECTED FINANCIAL DATA
(in thousands, except per share data)                         SEPT. 30, 1999  SEPT. 30, 1998         1998          1997         1996
                                                              --------------  --------------         ----          ----         ----

<S>                                                           <C>             <C>              <C>          <C>           <C>
FOR PERIOD ENDED
Interest and fee income                                       $      75,369   $    75,980      $  101,080   $    96,181   $   84,387
Interest expense                                                     30,324        33,274          43,677        42,522       36,365
Net interest income                                                  45,045        42,706          57,403        53,659       48,022
Provision for loan losses                                             2,925         3,550           4,599         3,505        3,175
Noninterest income excluding securities gains (losses)                7,699         7,015           9,355         8,403        7,683
Securities gains (losses)                                             1,507           613             624         (337)        1,179
Noninterest expense                                                  27,940        28,648          39,128        35,170       34,422
Income before income taxes                                           23,386        18,136          23,655        23,050       19,287
Net income                                                           14,356        14,513          19,102        14,749       12,179

PER COMMON SHARE*
Basic earnings                                                $        1.10   $      1.10      $     1.45   $      1.12   $     0.93
Diluted earnings                                              $        1.09   $      1.07      $     1.42   $      1.11   $     0.93
Cash dividends paid                                           $       0.486   $     0.425      $    0.587   $     0.421   $    0.338
Stock dividends distributed                                             --%           --%              5%            5%           5%
Book value at period-end                                      $        9.80   $     10.08      $    10.02   $      9.30   $     8.24
Tangible book value at period-end                             $        9.28   $      9.49      $     9.44   $      8.66   $     7.47
Average common shares outstanding                                    13,022        13,241          13,198        13,176       13,058
Average diluted common shares outstanding                            13,165        13,509          13,474        13,335       13,140

PERIOD ENDED
Assets available for sale                                     $     358,648   $   395,836      $  358,645   $   443,918   $  373,337
Securities held to maturity                                          41,216        36,203          35,095        36,139       42,239
Loans                                                               898,668       797,604         821,505       735,482      654,593
Allowance for loan losses                                            13,555        12,611          12,962        11,582       10,473
Assets                                                            1,378,259     1,302,943       1,290,009     1,280,585    1,138,986
Deposits                                                          1,094,473     1,033,107       1,044,205     1,014,183      916,319
Short-term borrowings                                               113,163       120,215          96,589       134,527       88,244
Long-term debt                                                       35,161        10,174          10,171           183       20,195
Stockholders' equity                                                127,879       132,506         130,632       123,343      106,264

AVERAGE BALANCES
Assets                                                        $   1,317,448   $ 1,285,576      $1,288,334   $ 1,228,643   $1,110,968
Earning assets                                                    1,255,445     1,221,737       1,223,635     1,167,460    1,043,425
Loans                                                               858,937       762,338         774,640       695,552      617,810
Deposits                                                          1,043,439     1,031,842       1,029,817       973,641      916,683
Stockholders' equity                                                129,045       126,805         127,937       113,691      103,240

KEY RATIOS
Return on average assets                                              1.46%         1.51%           1.48%         1.20%        1.10%
Return on average equity                                             14.87%        15.30%          14.93%        12.97%       11.80%
Average equity to average assets                                      9.80%         9.86%           9.93%         9.25%        9.29%
Net interest margin                                                   4.88%         4.74%           4.76%         4.67%        4.69%
Efficiency                                                           53.22%        56.92%          57.92%        56.09%       60.74%
Cash dividend per share payout                                       44.74%        39.72%          41.34%        37.91%       36.50%
Tier 1 leverage                                                       9.37%         9.36%           9.33%         8.91%        8.70%
Tier 1 risk-based capital                                            14.39%        14.95%          14.69%        14.88%       14.06%
Total risk-based capital                                             15.64%        16.21%          15.94%        16.13%       15.31%

</TABLE>

                                       20
<PAGE>

<TABLE>
<CAPTION>

NBT BANCORP INC.
SELECTED FINANCIAL DATA
(in thousands, except per share data)                                  1995         1994
                                                                       ----         ----
<S>                                                              <C>          <C>
FOR PERIOD ENDED
Interest and fee income                                          $   77,400   $   70,438
Interest expense                                                     34,840       25,742
Net interest income                                                  42,560       44,696
Provision for loan losses                                             1,553        3,071
Noninterest income excluding securities gains (losses)                6,957        6,484
Securities gains (losses)                                               145          555
Noninterest expense                                                  33,024       38,674
Income before income taxes                                           15,085        9,990
Net income                                                            9,329        6,508

PER COMMON SHARE*
Basic earnings                                                   $     0.69   $     0.48
Diluted earnings                                                 $     0.69   $     0.47
Cash dividends paid                                              $    0.292   $    0.264
Stock dividends distributed                                              5%           5%
Book value at period-end                                         $     8.07   $     7.20
Tangible book value at period-end                                $     7.20   $     6.49
Average common shares outstanding                                    13,520       13,642
Average diluted common shares outstanding                            13,582       13,797

PERIOD ENDED
Assets available for sale                                        $  399,625   $  119,398
Securities held to maturity                                          40,311      272,466
Loans                                                               588,385      574,718
Allowance for loan losses                                             9,120        9,026
Assets                                                            1,106,266    1,044,557
Deposits                                                            873,032      791,443
Short-term borrowings                                               115,945      140,587
Long-term debt                                                        3,012        8,734
Stockholders' equity                                                108,044       98,307

AVERAGE BALANCES
Assets                                                           $1,042,198   $1,009,572
Earning assets                                                      977,738      942,989
Loans                                                               575,736      565,841
Deposits                                                            848,289      817,401
Stockholders' equity                                                101,630       99,710

KEY RATIOS
Return on average assets                                              0.90%        0.64%
Return on average equity                                              9.18%        6.53%
Average equity to average assets                                      9.75%        9.88%
Net interest margin                                                   4.43%        4.81%
Efficiency                                                           65.92%       70.22%
Cash dividend per share payout                                       42.61%       56.13%
Tier 1 leverage                                                       8.80%        9.05%
Tier 1 risk-based capital                                            15.21%       16.09%
Total risk-based capital                                             16.46%       17.35%
<FN>
*All share and per share data has been  restated to give  retroactive  effect to
stock dividends and splits.
</FN>
</TABLE>

                                       21
<PAGE>

<TABLE>
<CAPTION>

PIONEER AMERICAN HOLDING COMPANY CORP.
SELECTED FINANCIAL DATA
(in thousands, except per share data)                          SEPT. 30, 1999  SEPT. 30, 1998          1998         1997        1996
                                                               --------------  --------------          ----         ----        ----

<S>                                                            <C>             <C>              <C>           <C>          <C>
FOR PERIOD ENDED
Interest and fee income                                        $    21,950     $     21,182     $    28,302   $   26,507   $  24,358
Interest expense                                                    11,164           10,615          14,319       12,845      10,874
Net interest income                                                 10,786           10,567          13,983       13,662      13,484
Provision for loan losses                                              280              450             420          535         500
Noninterest income excluding securities gains (losses)               2,028            1,792           2,450        2,304       2,012
Securities gains (losses)                                               88              298             511          157          -
Noninterest expense                                                  8,456            8,130          10,967       10,080       9,749
Income before income taxes                                           4,166            4,077           5,557        5,508       5,247
Net income                                                           3,056            2,968           4,022        4,008       3,704

PER COMMON SHARE*
Basic earnings                                                 $      1.05     $       1.03     $      1.39   $     1.41   $    1.32
Diluted earnings                                               $      1.04     $       1.01     $      1.36   $     1.36   $    1.26
Cash dividends paid                                            $     0.600     $      0.570     $     0.770   $    0.720   $   0.660
Stock dividends distributed                                            --                --              --           --          --
Book value at period-end                                       $     10.87     $      12.15     $     12.21   $    11.67   $   10.70
Tangible book value at period-end                              $     10.68     $      11.95     $     12.01   $    11.45   $   10.46
Average common shares outstanding                                    2,914            2,890           2,894        2,850       2,812
Average diluted common shares outstanding                            2,942            2,953           2,953        2,939       2,932

PERIOD ENDED
Assets available for sale                                      $   115,547     $     86,087     $   101,079   $   96,696   $  76,019
Securities held to maturity                                         37,444           50,429          46,178       37,379      20,860
Loans                                                              240,566          225,583         225,735      212,342     204,048
Allowance for loan losses                                            3,000            3,037           2,909        2,759       2,750
Assets                                                             421,854          403,074         405,157      370,126     330,213
Deposits                                                           304,632          303,300         307,360      293,643     295,946
Short-term borrowings                                                   --               --              --        2,350          --
Long-term debt                                                      80,409           59,308          58,357       37,073         275
Stockholders' equity                                                31,906           35,301          35,466       33,398      30,263

AVERAGE BALANCES
Assets                                                         $   423,585     $    390,083     $   394,312   $  358,608   $ 326,494
Earning assets                                                     396,055          363,728         367,205      332,618     301,788
Loans                                                              234,100          217,631         221,484      205,731     207,030
Deposits                                                           307,050          292,290         296,285      298,844     291,883
Stockholders' equity                                                34,977           33,689          33,877       31,379      29,017

KEY RATIOS
Return on average assets                                             0.96%            1.02%           1.02%        1.12%       1.13%
Return on average equity                                            11.68%           11.78%          11.87%       12.77%      12.76%
Average equity to average assets                                     8.26%            8.64%           8.59%        8.75%       8.89%
Net interest margin                                                  3.80%            4.04%           3.96%        4.27%       4.59%
Efficiency                                                          63.66%           63.65%          64.54%       61.04%      61.40%
Cash dividend per share payout                                      57.69%           56.44%          56.62%       52.94%      52.38%
Tier 1 leverage                                                      7.97%            8.53%           8.41%        8.57%       8.96%
Tier 1 risk-based capital                                           14.40%           15.24%          15.35%       15.80%      15.28%
Total risk-based capital                                            15.65%           16.49%          16.60%       17.05%      16.53%
</TABLE>

                                       22
<PAGE>

<TABLE>
<CAPTION>

PIONEER AMERICAN HOLDING COMPANY CORP.
SELECTED FINANCIAL DATA
(in thousands, except per share data)                                 1995             1994
                                                                      ----             ----

<S>                                                              <C>              <C>
Interest and fee income                                          $  23,662        $  20,626
Interest expense                                                    11,227            8,157
Net interest income                                                 12,435           12,469
Provision for loan losses                                              420              310
Noninterest income excluding securities gains (losses)               1,448            1,290
Securities gains (losses)                                              465               29
Noninterest expense                                                  9,075            8,697
Income before income taxes                                           4,853            4,781
Net income                                                           3,483            3,448

PER COMMON SHARE*
Basic earnings                                                   $    1.25        $    1.24
Diluted earnings                                                 $    1.20        $    1.19
Cash dividends paid                                              $   0.600        $   0.580
Stock dividends distributed                                             --               --
Book value at period-end                                         $   10.23        $    9.00
Tangible book value at period-end                                $    9.97        $    8.73
Average common shares outstanding                                    2,783            2,771
Average diluted common shares outstanding                            2,906            2,892

PERIOD ENDED
Assets available for sale                                        $  68,328        $  50,467
Securities held to maturity                                         26,033           52,915
Loans                                                              197,297          179,872
Allowance for loan losses                                            2,742            2,699
Assets                                                             320,647          302,408
Deposits                                                           288,252          270,718
Short-term borrowings                                                   --            3,150
Long-term debt                                                         275              275
Stockholders' equity                                                28,492           24,978

AVERAGE BALANCES
Assets                                                           $ 315,387        $ 283,208
Earning assets                                                     293,109          263,805
Loans                                                              188,816          168,157
Deposits                                                           282,154          254,557
Stockholders' equity                                                27,024           25,188

KEY RATIOS
Return on average assets                                             1.10%            1.22%
Return on average equity                                            12.89%           13.69%
Average equity to average assets                                     8.57%            8.89%
Net interest margin                                                  4.39%            4.89%
Efficiency                                                          63.40%           61.25%
Cash dividend per share payout                                      50.00%           48.74%
Tier 1 leverage                                                      8.75%            8.26%
Tier 1 risk-based capital                                           15.57%           15.63%
Total risk-based capital                                            16.82%           16.88%

<FN>
*All share and per share data has been  restated to give  retroactive  effect to
stock dividends and splits.
</FN>
</TABLE>

                                       23
<PAGE>

<TABLE>
<CAPTION>

PRO FORMA COMBINED
SELECTED FINANCIAL DATA
(in thousands, except per share data)                          SEPT. 30, 1999    SEPT. 30, 1998          1998          1997
                                                               --------------    --------------          ----          ----

<S>                                                            <C>              <C>               <C>           <C>
FOR PERIOD ENDED
Interest and fee income                                        $    121,428     $    118,854      $   158,602   $   147,338
Interest expense                                                     55,193           56,248           74,736        68,892
Net interest income                                                  66,235           62,606           83,866        78,446
Provision for loan losses                                             3,860            4,490            6,149         4,820
Noninterest income excluding securities gains (losses)               13,104           11,960           16,307        13,894
Securities gains (losses)                                             1,803              991            1,567            34
Noninterest expense                                                  45,750           44,816           61,547        54,460
Income before income taxes                                           31,532           26,251           34,044        33,094
Net income                                                           20,437           20,589           26,895        22,188

PER COMMON SHARE*
Basic earnings                                                 $       0.88     $       0.89      $      1.16   $      1.00
Diluted earnings                                               $       0.87     $       0.87      $      1.14   $      0.98
Cash dividends paid                                            $      0.486     $      0.425      $     0.587   $     0.421
Stock dividends distributed                                              0%               0%               5%            5%
Book value at period-end                                       $       8.39     $       8.89      $      8.84   $      8.31
Tangible book value at period-end                              $       7.96     $       8.41      $      8.36   $      7.87
Average common shares outstanding                                    23,104           23,230           23,199        22,239
Average diluted common shares outstanding                            23,427           23,730           23,691        22,698

PERIOD ENDED
Assets available for sale                                      $    648,073     $    551,822      $   543,025   $   597,780
Securities held to maturity                                         125,957          191,103          193,099       131,763
Loans                                                             1,420,102        1,238,621        1,271,644     1,157,548
Allowance for loan losses                                            19,101           17,619           18,231        16,450
Assets                                                            2,353,030        2,150,723        2,169,855     2,018,784
Deposits                                                          1,741,139        1,639,258        1,664,307     1,588,276
Short-term borrowings                                               145,777          122,342           99,872       137,077
Long-term debt                                                      253,774          165,670          183,987        84,912
Stockholders' equity                                                194,593          206,100          204,038       192,556

AVERAGE BALANCES
Assets                                                         $  2,236,970     $  2,093,419      $ 2,111,855   $ 1,931,317
Earning assets                                                    2,100,865        1,965,226        1,979,883     1,813,157
Loans                                                             1,338,368        1,195,431        1,214,753     1,095,347
Deposits                                                          1,672,610        1,605,827        1,614,766     1,540,597
Stockholders' equity                                                200,537          197,002          198,538       167,585

KEY RATIOS
Return on average assets                                              1.22%            1.31%            1.27%         1.15%
Return on average equity                                             13.63%           13.97%           13.55%        13.24%

Average equity to average assets                                      8.96%            9.41%            9.40%         8.68%
Net interest margin                                                   4.35%            4.37%            4.35%         4.45%
Efficiency                                                           56.83%           59.04%           60.45%        57.73%
Cash dividend per share payout                                       55.86%           48.85%           51.49%        42.96%
Tier 1 leverage                                                       8.64%            9.03%            8.81%         9.08%
Tier 1 risk-based capital                                            13.95%           14.93%           14.68%        15.44%
Total risk-based capital                                             15.11%           16.10%           15.87%        16.64%
</TABLE>

                                       24
<PAGE>

<TABLE>
<CAPTION>

PRO FORMA COMBINED
SELECTED FINANCIAL DATA
(in thousands, except per share data)                                     1996         1995            1994
                                                                          ----         ----            ----

<S>                                                                <C>           <C>          <C>
FOR PERIOD ENDED
Interest and fee income                                            $   129,020   $  119,610     $   105,221
Interest expense                                                        57,422       55,581          39,866
Net interest income                                                     71,598       64,029          65,355
Provision for loan losses                                                4,325        2,783           3,756
Noninterest income excluding securities gains (losses)                  12,358       10,555           9,341
Securities gains (losses)                                                1,222          941             696
Noninterest expense                                                     52,168       49,862          54,202
Income before income taxes                                              28,685       22,880          17,434
Net income                                                              18,914       15,119          12,084

PER COMMON SHARE*
Basic earnings                                                     $      0.86   $     0.68     $      0.54
Diluted earnings                                                   $      0.85   $     0.67     $      0.53
Cash dividends paid                                                $     0.338   $    0.292     $     0.264
Stock dividends distributed                                                 5%           5%              5%
Book value at period-end                                           $      7.21   $     7.07     $      6.25
Tangible book value at period-end                                  $      6.69   $     6.50     $      5.76
Average common shares outstanding                                       21,979       22,353          22,404
Average diluted common shares outstanding                               22,287       22,636          22,778

PERIOD ENDED
Assets available for sale                                          $   510,070   $  521,938     $   204,126
Securities held to maturity                                             89,700       88,933         367,916
Loans                                                                1,036,146      936,240         890,985
Allowance for loan losses                                               15,053       13,519          13,221
Assets                                                               1,767,105    1,678,772       1,583,090
Deposits                                                             1,465,461    1,370,043       1,254,348
Short-term borrowings                                                   88,544      121,345         154,487
Long-term debt                                                          40,493       18,443          24,228
Stockholders' equity                                                   157,699      156,045         139,084

AVERAGE BALANCES
Assets                                                             $ 1,714,416   $1,608,687     $ 1,496,457
Earning assets                                                       1,599,126    1,500,520       1,392,711
Loans                                                                  990,188      910,335         856,580
Deposits                                                             1,442,041    1,337,734       1,241,684
Stockholders' equity                                                   152,499      146,166         141,177

KEY RATIOS
Return on average assets                                                 1.10%        0.94%           0.81%
Return on average equity                                                12.40%       10.34%           8.56%

Average equity to average assets                                         8.90%        9.09%           9.43%
Net interest margin                                                      4.60%        4.38%           4.81%
Efficiency                                                              60.75%       65.31%          67.99%
Cash dividend per share payout                                          39.76%       43.58%          49.81%
Tier 1 leverage                                                          8.55%        8.61%           8.82%
Tier 1 risk-based capital                                               13.90%       14.89%          15.44%
Total risk-based capital                                                15.11%       16.11%          16.66%

<FN>
*All share and per share data has been  restated to give  retroactive  effect to
stock dividends and splits.
</FN>
</TABLE>

                                       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 pro forma combined company information  includes financial
data for Lake Ariel Bancorp,  Inc. The pro forma information gives effect to the
merger  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 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
   For the nine months ended September 30, 1999          $  1.10          $  1.05          $  0.88       $  1.59
Year - Ended:
  December 31, 1998                                         1.45             1.39             1.16          2.09
  December 31, 1997                                         1.12             1.41             1.00          1.81
  December 31, 1996                                         0.93             1.32             0.86          1.55
DILUTED EARNINGS
  For the nine months ended September 30, 1999           $  1.09          $  1.04          $  0.87       $  1.57
Year - Ended:
  December 31, 1998                                         1.42             1.36             1.14          2.06
  December 31, 1997                                         1.11             1.36             0.98          1.77
  December 31, 1996                                         0.93             1.26             0.85          1.53
CASH DIVIDEND PAID
  For the nine months ended September 30, 1999           $ 0.486          $ 0.600          $ 0.486       $ 0.877
Year - Ended:
  December 31, 1998                                        0.587            0.770            0.587         1.060
  December 31, 1997                                        0.421            0.720            0.421         0.760
  December 31, 1996                                        0.338            0.660            0.338         0.610
BOOK VALUE
As of:
  September 30, 1999                                     $  9.80          $ 10.87          $  8.39       $ 15.14
  December 31, 1998                                        10.02            12.21             8.84         15.96
TANGIBLE BOOK VALUE
As of:
  September 30, 1999                                     $  9.28          $ 10.68          $  7.96       $ 14.37
  December 31, 1998                                         9.44            12.01             8.36         15.09

</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  Binghamton
Regency  Hotel and  Conference  Center,  225 Water  Street,  One Sarbro  Square,
Binghamton, New York on April 25, 2000, at 10:00 a.m. local time.

WHAT WILL BE VOTED ON AT THE NBT ANNUAL MEETING

         |X|      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.

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

         |X|      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.

         |X|      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
April 25, 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 ,  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 ,
2000,  will be  entitled  to  receive  notice  of and to vote at the NBT  annual
meeting.  As of December 31, 1999, there were 13,097,996  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.

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:

         |X|      ratify the NBT Board's selection of NBT's independent auditor;

                                       27
<PAGE>

         |X|      issue NBT common stock in the merger;

         |X|      ratify the merger agreement and related matters; and

         |X|      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:

         |X|      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

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

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

         |X|      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.

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

                                       28
<PAGE>

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

         |X|      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:

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

         |X|      granting a later-dated proxy; or

         |X|      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

         NBT has selected  KPMG LLP as its  independent  auditor for the current
fiscal  year.  Representatives  of KPMG LLP 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.

         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

                                       29
<PAGE>

         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"  and "Proposal 2 -- Proposal to Ratify the Board of Directors  Action
in Selection of KPMG LLP as NBT's Independent Auditor."

         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 3 -- 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 April 25, 2000 at
10:00 a.m. local time.

WHAT WILL BE VOTED ON AT THE PIONEER AMERICAN SPECIAL MEETING

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

         |X|      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  April 25, 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 , 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
,  2000,  will be  entitled  to  receive  notice  of and to vote at the  Pioneer
American 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

                                       30
<PAGE>

         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

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

         |X|      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:

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

         |X|      granting a later-dated proxy;

         |X|      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.

                                       31
<PAGE>

         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."


                                   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

                                       32
<PAGE>

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, following the effective time of the merger, the NBT Board,
in accordance with the merger  agreement,  will expand the size of the NBT Board
from twelve to fifteen and,  subject to the fiduciary duties of its directors to
NBT,  will fill the  vacancies so created by electing or  appointing  to the NBT
Board  three  individuals  who are  currently  serving as  directors  of Pioneer
American,  Messrs.  Gene E. Goldenziel to serve as a director of the class whose
term  expires in 2001,  Richard  Chojnowski  to serve as a director of the class
whose term  expires in 2002,  and Joseph G. Nasser to serve as 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:

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

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

         |X|      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.

         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:

                                       33
<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>
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 (i)       11/09/46         President of LA Bank and CEO        2000
                                              Lake Ariel for more than 5 years

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 (i)          11/22/31         President of Lake Ariel and         2000
                                              Chairman of subsidiaries for
                                              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 (i)      12/08/37         Retired attorney-at-law; County     2000
                                              Solicitor and District Attorney
                                              of Pike County, PA


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        22,692(1)                  0.22%
                                            Mutual Ins. Co. (c)                                724(2)(b)               *
                                            Directorships:
                                               Preferred Mutual Ins. Co. (c);
                                               Leatherstocking Cooperative
                                                  Ins. Co;
                                               NBT Bank since 1977


                                       34
<PAGE>

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;                            1,436(1)(b)               *
                                              Chairman and CEO of NBT Bank                   7,347(2)                  *
                                              since September 1999;                          1,511(2)(b)               *
                                              President and CEO of                         148,818(3)                  1.20%
                                              NBT Bank from
                                              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                     1986        94,840(1)                  0.76%
                                              since January 1995;                            5,016(2)                  *
                                              Chairman of NBT Bank from                      3,047(2)(b)               *
                                              January 1995 to 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>

<TABLE>
<CAPTION>

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

                                                                                            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>
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 of NBT Bank since September  6,936(1)                  *
                                                       1999; Executive Vice President of     5,545(1)(b)               *
                                                       Retail Banking 1998 - 1999;           3,288(2)                  *
                                                       Senior Vice President of Retail       848(2)(b)                 *
                                                       Banking 1996 - 1998;                  44,457(3)                 0.36%
                                                       Senior Vice President and Chief       7,000(g)                  *
                                                       Credit Officer 1995 - 1996;
                                                       Regional Manager 1993 - 1995;
                                                       Director of Marketing 1991 - 1993


                                       35
<PAGE>

Joe C. Minor               10/7/42          3/1/93    President of NBT Financial Services    4,760(1)                  *
                                                       Corp. since September 1999; Chief     2,374(1)(b)               *
                                                       Financial Officer and Treasurer      43,579(3)                  0.35%
                                                       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 to 1995
</TABLE>

         All  directors  and executive  officers as a group  beneficially  owned
741,711 shares as of December 31, 1999, which  represented 5.96% 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.

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%


         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.


                                       36
<PAGE>

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.

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

                                       37
<PAGE>

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.

<TABLE>
<CAPTION>

                           SUMMARY COMPENSATION TABLE

                                                                                          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>            <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                 1997     125,000     55,400                            -0-        12,789            14,400
  of 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.


                                       38
<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.

<TABLE>
<CAPTION>
                        OPTION GRANTS IN LAST FISCAL YEAR
                                                                                                         Potential Realizable Value
                                                                                                         at Assumed Annual Rates
                                                                                                         of Stock Price Appreciation
                                 Individual Grants                                                       for Opion 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.

<TABLE>
<CAPTION>

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

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

                                       39
<PAGE>

                           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.
<TABLE>
<CAPTION>

                                                                       YEARS OF PARTICIPATION
                                                     -------------------------------------------------------------
         Final Average
         EARNINGS                                    10 YEARS          20 YEARS         30 YEARS          40 YEARS
         --------                                    --------          --------         --------          --------

<S>      <C>                        <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

                                       40
<PAGE>

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.

         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 CONTRACTS AND TERMINATION OF EMPLOYMENT

         There are no employment contracts between NBT or NBT Bank and the named
executive officers.


CHANGE IN CONTROL CONTRACTS

         The Company has entered into a change in control  contract with each of
Messrs. Forsythe,  Minor, Chewens,  Dietrich, and Roberts. The contract 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', Dietrich's, or Roberts'
respective  employment  with NBT or NBT Bank is terminated  without cause or his
salary is reduced or his duties or  responsibilities  are  changed  (except in a
promotion)  Messrs.  Forsythe,  Minor,  Chewens,  Dietrich,  or Roberts  will be
entitled to receive 2.99 times a base  amount.  An  executive's  base amount for
these  purposes  is 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

                                       41
<PAGE>

income  recognized  with respect to stock  options.  The  agreement is effective
until December 31, 2000, and is  automatically  renewed for one additional  year
commencing at December 31, 2000 and each December 31 thereafter.

SUPPLEMENTAL RETIREMENTS BENEFITS

         NBT agreed in January 1995 to provide Mr.  Forsythe  with  supplemental
retirement  benefits  ("SERP").  The SERP will provide that annual  supplemental
benefits at normal  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 annual amounts  payable to the individual  under
(a) NBT's pension plan, (b) NBT's ESOP, (c) social security, and (d) the pension
plan of former  employers,  as the case may be. 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 Mr. Forsythe's
attainment of age 65. The SERP provides that it shall at all times be unfunded.

         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 at anytime after February 6, 1995.
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

         Mr.  Forsythe was hired  effective  December 31, 1994, as President and
Chief  Executive  Officer of NBT and NBT Bank.  In September  1999, as part of a
corporate  restructure,  Mr.  Forsythe was promoted to Chairman of the Board and
Chief  Executive  Officer of NBT Bank,  replacing  Everett  Gilmour  who remains
Chairman of the Board of NBT.  During  1999,  Mr.  Forsythe was employed at will
without an employment  contract at an annual  salary of $300,000.  Commencing on
January 1, 2000,  Mr.  Forsythe and other senior  executives of NBT entered into
employment agreements with NBT. Mr. Forsythe's contract will extend through 2002
(three years) with a provision to extend the term one additional  year by mutual
agreement. Salary for 2000 will remain at $300,000 and will increase to $350,000
in 2001  and to  $400,000  in 2002  (if  the  contract  is  extended  by  mutual
agreement, the salary for the additional year will remain at $400,000).  Maximum
bonus  opportunity,  provided under the Executive  Incentive  Compensation Plan,
will be 80% of base pay throughout the life of the contract.  The agreement also
grants Mr.  Forsythe  additional  time off  during  2001 and 2002 (with the 2002
provision continued if the contract term is extended) and other benefits such as
company car,  country club  privileges,  participation in NBT's various employee
benefits plans such as the Stock Option Plan, the retirement plan, the 401k/ESOP
Plan, and various health,  disability,  and life insurance  plans.  The contract
also  provides  for an  orderly  transition  of the  chairmanship  of NBT to Mr.
Forsythe in April 2001 when Mr. Gilmour's term of directorship ends.


         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, 75% of the cost of which, being attributable to Mr. Forsythe,  is
reflected in the Summary Compensation Table above.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

                                       42
<PAGE>

         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 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:

         |X|      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.

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

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

                                       43
<PAGE>

         |X|      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  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

                                       44
<PAGE>

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 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

                                       45
<PAGE>

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.

         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.


                                       46
<PAGE>

         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 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


                                       47
<PAGE>

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 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.


                                       48
<PAGE>

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.

         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



                                       49
<PAGE>

                                   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  NO.  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.


                                       50
<PAGE>

                                   PROPOSAL 3
       (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.

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


                                       51
<PAGE>

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.

         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 has 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 mergers could be negotiated.

         In early 1999, the Pioneer American Board retained Danielson Associates
Inc.  as  its  investment  banker  to  evaluate  Pioneer  American's   strategic
alternatives.  In  mid-September  1999,  Daryl R. Forsythe,  President and Chief
Executive Officer of NBT contacted Arnold Danielson of Danielson Associates Inc.
to  express  NBT's  interest  in  increasing  its market  share in  northeastern
Pennsylvania beyond the potential created by the pending Lake Ariel merger.

         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 Mr. Forsythe to pursue the opportunity.

         On September 28, 1999, Mr. Danielson  discussed with Pioneer American's
Board the discussions with Mr. Forsythe and the details of the potential merger.
The Board authorized John W. Reuther,  President and Chief Executive  Officer of
Pioneer American,  to pursue  discussions with NBT and to evaluate  interests of
any other potential merger candidates.

         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.  The meeting
helped both parties understand the potential benefits of merging.

         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 merger agreement.  Both
parties  felt the meeting  confirmed  the merits of merging  the two  companies,
especially in light of the recently announced agreement with Lake Ariel.

         During the  ensuing  weeks,  conversations  continued  between  Messrs.
Forsythe and Reuther.  Throughout the discussions,  Pioneer  American  consulted


                                       52
<PAGE>

with its financial advisor and counsel.  Pioneer American's  advisor reviewed,
in  general,  the merger and  acquisition  market,  NBT's  financial  condition,
operating performance and common stock trading history and the proposed exchange
ratio.

         On November 2, 1999,  Mr.  Forsythe  again 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  proposal.  Several  items were  discussed,
including the proposed  structure,  Board seats,  deal  parameters and potential
growth  opportunities  that could  result if the  merger of LA Bank and  Pioneer
American with NBT were to occur.

         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 a 5% stock  dividend  that was
recently  announced.  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,  Pioneer  American's  Board voted to pursue the
merger with NBT in earnest with the goal of arriving at a  definitive  agreement
of merger.  On this date the law firm of Blank Rome Comisky & McCauley,  L.L.P.,
of Philadelphia,  Pennsylvania was retained to represent Pioneer American in the
merger process.  Danielson  Associates Inc. and Pioneer American entered into an
agreement for Danielson  Associates Inc. to act as financial  advisor to Pioneer
American  in  connection  with  issuance  of a fairness  opinion  related to the
proposed acquisition of Pioneer American by NBT.

         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

         |X|      corporate documents;

         |X|      financial reports;

         |X|      regulatory and legal compliance reports;

         |X|      tax returns and related matters;

         |X|      board of directors and management information;

         |X|      transactions between directors, officers, employees and their
                  affiliates;

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

         |X|      schedule of office locations, facilities and related matters;

         |X|      lending activities;

         |X|      major non-performing asset and reserve policy information;

         |X|      lawsuits, assessments and claims;

         |X|      savings activities;

         |X|      insurance coverage;


                                       53
<PAGE>

         |X|      investment and liquidity policy; and

         |X|      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.

         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:

         |X|      NBT's strategic expansion plans and acquisition objectives:

                  |X|      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


                                       54
<PAGE>
                           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;

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

                  |X|      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;

                  |X|      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;

         |X|      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;

         |X|      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;

         |X|      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;

         |X|      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;

         |X|      the likelihood of the merger being approved by the appropriate
                  regulatory authorities;


                                       55
<PAGE>

         |X|      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;

         |X|      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;

         |X|      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;

         |X|      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:

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

         |X|      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;

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


                                       56
<PAGE>

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

         |X|      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;

         |X|      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;

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

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

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

         |X|      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;

         |X|      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;

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

         |X|      Prospects for continued local identity; and

         |X|      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.


                                       57
<PAGE>

         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:

         |X|      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;

         |X|      upwards but not downwards if all of the following occur:

                  (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:

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

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

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

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


                                       58
<PAGE>

         |X|      Adequacy of reserves for loan and lease losses of the parties.

         |X|      Composition of the deposit bases of each of the parties.

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

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

         |X|      Contemplation of other factors, including  certain  intangible
                  factors.

         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:

         |X|      The merger agreement detailing the pending transaction;


                                       59
<PAGE>

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

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

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

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

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

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

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

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

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

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

         |X|      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;

         |X|      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;

         |X|      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;

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

         |X|      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;

         |X|      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;

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

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


                                       60
<PAGE>

         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  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:


                                       61
<PAGE>

         The following table reflects the acquisition of Lake Ariel on February
17, 2000, and is based on reported financial data for Pioneer American,  NBT and
Lake  Ariel  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:
<TABLE>
<CAPTION>

                                            PRO FORMA CONTRIBUTION TABLE

                                                    As of 9-30-99

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

                    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  Company            80.7%                     19.3%
for fiscal year 2000.
- --------------------------------------------- -------------------------- -------------------------
Estimated  Net  Income of  Combined  Company            76.7%                     23.3%
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:

         |X|  Material  differences  in  the  underlying  capitalization  of the
              comparable  institutions  which are being acquired;
         |X|  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;
         |X|  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;
         |X|  Material differences in the form or forms of consideration used to
              complete the transaction;


                                       62
<PAGE>

         |X|  Differences between the planned method of accounting  for the
              completed  transaction;
         |X|  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.

         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:

         |X| Acquired  institutions  are all  commercial  banks.
         |X| Announced between June 1, 1998 and  December 7, 1999.
         |X| 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.
<TABLE>
<CAPTION>

                     "Comparable" statistics as of the announcement date:
- ---------------------------------------- -------------------------------------- -------------------------------------

          Compared statistics            Announced transaction price/tangible       Announced transaction price/
                                                      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


                                       63
<PAGE>

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 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

         |X|      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;

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

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

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

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

         |X|      reviewed the merger agreement and certain related documents;
                  and

         |X|      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


                                       64
<PAGE>

create an incomplete view of Danielson Associates' opinion. The preparation of a
fairness opinion is 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.
<TABLE>
<CAPTION>

                                     SUMMARY AND DESCRIPTION OF COMPARABLE BANKS

                                                       ASSETS*                HEADQUARTERS

                                                       (in mill.)
              COMPARABLE BANKS**

              <S>                                      <C>                    <C>
                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.
</TABLE>

  *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.

         Danielson Associates compared NBT's


                                       65
<PAGE>

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

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

         |X|      equity as of September 30, 1999 of 9.28% of assets;

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

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

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

         The comparable medians were

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

         |X|      dividend yield of 3.29%;

         |X|      equity of 6.40% of assets;

         |X|      .35% of assets nonperforming;

         |X|      return on average assets of 1.22% and

         |X|      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.
<TABLE>
<CAPTION>

                                           NBT - COMPARABLE BANKS SUMMARY
                                                                                              Comparable Banks
                                                                     NBT                          Medians
                INCOME

                <S>                                                  <C>                            <C>
                  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>

                                       66
<PAGE>

   *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.

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
December 7, 1999, 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  directed  only to the  consideration  to be received by
Pioneer  American   shareholders  in  the  merger  and  does  not  constitute  a


                                       67
<PAGE>

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,

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

         |X|      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

         |X|      NBT or an  affiliate of NBT will  maintain the life  insurance
                  paid by Pioneer  American Bank 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  affiliate  of NBT.
Additionally,  Mr.  Reuther will be eligible to be  considered  for  performance


                                       68
<PAGE>

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:

         |X|      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;

         |X|      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 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;


                                       69
<PAGE>

         |X|      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

         |X|      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:

         |X|      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;

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

         |X|      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;

         |X|      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;

         |X|      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;

         |X|      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;

         |X|      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

         |X|      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.

         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


                                       70
<PAGE>

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 and subject to the fiduciary  duties of its directors to NBT, 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.  In the merger agreement NBT has agreed that,  subject to the
fiduciary  duty of its directors to NBT, NBT will cause these three  individuals
to be elected or appointed 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.

         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


                                       71
<PAGE>

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:

         |X|      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;

         |X|      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;

         |X|      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;

         |X|      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;

         |X|      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;

         |X|      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;

         |X|      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

         |X|      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.

         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.

                                       72
<PAGE>

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

         |X|      completion of the merger;

         |X|      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

         |X|      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:

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

         |X|      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;

         |X|      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

         |X|      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

         |X|      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

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

         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


                                       73
<PAGE>

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:

         |X|      a widely dispersed public distribution;

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

         |X|      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

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


                                       74
<PAGE>

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.

         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


                                       75
<PAGE>

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:

         |X|      due   organization,   corporate  power,   good  standing  and
                  due registration  as  a  bank  holding  company
         |X|      capitalization
         |X|      subsidiaries
         |X|      corporate power and authority to conduct business, own
                  property and enter into the merger agreement, the stock
                  option agreement and related transactions
         |X|      non-contravention of certain organizational documents, agree-
                  ments or governmental orders


                                       76
<PAGE>

         |X|      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
         |X|      financial statements
         |X|      examinations by bank regulatory agencies
         |X|      undisclosed liabilities
         |X|      litigation and regulatory action
         |X|      compliance with laws
         |X|      contractual defaults
         |X|      brokers and financial advisers
         |X|      tax and accounting matters
         |X|      insurance
         |X|      labor matters
         |X|      environmental matters
         |X|      absence of certain material changes and events
         |X|      required regulatory approvals
         |X|      loans and non-performing and classified assets
         |X|      allowances for loan losses
         |X|      administration of fiduciary accounts
         |X|      Year 2000 readiness
         |X|      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:

         |X|      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


                                       77
<PAGE>

         |X|      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

         |X|      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:

         |X|      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  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

         |X|      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

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

         |X|      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:

         |X|      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;

         |X|      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;

         |X|      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;

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

         |X|      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;


                                       78
<PAGE>

         |X|      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

         |X|      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

         |X|      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;

         |X|      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;

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

         |X|      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


                                       79
<PAGE>

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,  omissions  occurring  prior to the
effective time.

         Post-Closing  Governance.  NBT has  agreed,  subject  to the  fiduciary
duties of its directors to NBT, to cause three  members of the Pioneer  American
Board to be appointed to 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."

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

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

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

         |X|      cooperation in issuing public announcements;

         |X|      access to information;

         |X|      confidentiality;

         |X|      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

         |X|      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:

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

         |X|      obtaining all governmental approvals required to complete the
                  merger;

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

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

         |X|      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;

         |X|      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;

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


                                       80
<PAGE>

         |X|      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:

         |X|      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;

         |X|      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

         |X|      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:

         |X|      by mutual written consent of the parties;

         |X|      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.

         |X|      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


                                       81
<PAGE>
                           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.

         |X|      by NBT if either of the following occurs:

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

                  (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:

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

         |X|  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


                                       82
<PAGE>

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  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:

         |X|      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;

         |X|      indemnification of Pioneer American directors and officers;

         |X|      employment of Mr. Reuther; and

         |X|      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:

         |X|      confidentiality of information obtained in connection with the
                  merger agreement;

         |X|      provisions regarding information provided for applications and
                  the registration statement;


                                       83
<PAGE>

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

         |X|      expenses incurred in connection with the proposed merger.

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:

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

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

         |X|      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."


                                       84
<PAGE>

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:

         |X|      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;

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

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

         |X|      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

         |X|      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.

         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.


                                       85
<PAGE>

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

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.

NBT FOLLOWING THE MERGER

         NBT has agreed in the merger  agreement and the merger that NBT, as the
surviving corporation, will, subject to the fiduciary duties of its directors to
NBT,  elect or appoint  three members of the Pioneer  American  Board to the NBT
Board.  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 NBT  will,  subject  to the  fiduciary  duties  of its
directors to NBT, cause Messrs. Nasser,  Goldenziel,  and Chojnowski,  currently
directors  of Pioneer  American,  to be elected or appointed as 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  Pioneer  American  directors
appointed to newly-created  directorships  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


                                       86
<PAGE>

Bank and Pioneer American Bank may have a material effect on the business of NBT
or Pioneer American.

         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  $13,243,000  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


                                       87
<PAGE>

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.

         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:

         |X|      the default of a commonly controlled FDIC-insured depository
                  institution or

         |X|      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:

         |X|      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

         |X|      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 14.30 percent and 15.55 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


                                       88
<PAGE>

at December 31, 1999 would have been 14.35  percent for Tier 1 capital and 15.61
percent for total capital.

         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 9.50 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 9.17
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


                                       89
<PAGE>

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 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

         |X|  is well capitalized, or

         |X|  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:

         |X|      the level of undivided profits, and

         |X|      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  $21.9 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


                                       90
<PAGE>

deposits  insured by the BIF vary  between  $0.00 per $100 of deposits for banks
classified in the highest capital and 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 $134,166 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:

         |X|      bank holding companies such as NBT and Pioneer American are
                  permitted to acquire banks and bank holding companies
                  located in any state;

         |X|      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

         |X|      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.


                                       91
<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  Blank Rome  Comisky & McCauley  LLP,  counsel to Pioneer
American,  to deliver an opinion as to the anticipated  material  federal income
tax consequences of the merger.  In rendering its opinion,  Blank Rome Comisky &
McCauley  LLP  assumed,   among  other  things,  that  the  merger  and  related
transactions will take place as described in the merger agreement.  Consumation
of the merger is conditioned upon the receipt of an opinion that the merger will
qualify as a reorganization under Section 368(a)(1)(A) of the Internal Revenue
Code of 1986 as amended.

         In that case, in the opinion of Blank Rome Comisky & McCauley LLP, the
following would be the material federal income tax consequences of the merger:

         |X|      the merger will be treated for federal income tax purposes as
                  a reorganization within the meaning of Section
                  368(a)(1)(A) of the Internal Revenue Code;


                                       92
<PAGE>

         |X|      no gain or loss will be recognized by Pioneer American or NBT
                  in the merger;

         |X|      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, as provided in Section 302(a) of the
                  Internal Revenue Code;

         |X|      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

         |X|      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.

         We include the above  discussion  for  general  information  only.  The
discussion  does not  address  the state,  local or foreign  tax  aspects of the
merger. The discussion is based on currently existing provisions of the Internal
Revenue  Code,   existing  and  proposed   treasury   regulations   and  current
administrative rulings and court decisions.  All of the foregoing are subject to
change  and any  such  change  could  affect  the  continuing  validity  of this
discussion.  Each Pioneer American stockholder should consult his or her own tax
advisor with respect to the  specific tax  consequences  of the merger to him or
her, including the application and effect of state, local and foreign tax laws.


                    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
1998
<S>                                               <C>        <C>           <C>          <C>        <C>           <C>
           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
           __________, 2000)
</TABLE>


                                       93
<PAGE>

         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 , 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 $ 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 $XX.xx per share,  the lowest  sales price of Pioneer  American
common stock was $XX.xx per share and the last  reported  sales price of Pioneer
American  common  stock  was  $27.75  per  share.  On , 2000,  the  most  recent
practicable date prior to the printing of this joint proxy statement/prospectus,
the last reported sales price of Pioneer  American common stock was $ per share.
We urge  stockholders  to obtain current market  quotations  prior to making any
decisions with respect to the merger.

         As of , 2000,  there were  holders  of record of NBT  common  stock and
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 ,
2000, XX,xxx,XXX shares of NBT common stock were outstanding.


                                       94
<PAGE>

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 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


                                       95
<PAGE>

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."

<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, special   Stockholders may call a special meeting of
Stockholders                 meetings of the stockholders may be        stockholders at the written request of the
                             called  at any time by the board of        holders of at least 50% of all shares
                             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 List    Stockholders may inspect a list of         Stockholders may inspect a list of
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       classes, with directors in each class being
                             each class being elected for staggered     elected for staggered three-year terms.
                             four-year terms.
- ---------------------------- ------------------------------------------ --------------------------------------------
Election of the Board of     Directors are elected by a plurality of    Directors are elected by a plurality of
Directors                    the votes cast.                            the votes cast.
- ---------------------------- ------------------------------------------ --------------------------------------------

                                       96
<PAGE>

                               PIONEER AMERICAN STOCKHOLDERS'              PIONEER AMERICAN STOCKHOLDERS'
                                       RIGHTS PRE-MERGER                            RIGHTS POST-MERGER
- ---------------------------- ------------------------------------------ --------------------------------------------
Removal of  Directors        Stockholders  may  remove a director       Stockholders may remove a director only
                             only for cause by the affirmative vote     for cause by the affirmative vote of a
                             of at least 75% of shareholders entitled   majority in voting power of the
                             to cast votes.                             stockholders entitled to vote and to be
                                                                        present at the meeting called for such
                                                                        purpose.
- -------------------------- ------------------------------------------ --------------------------------------------
Vacancies on the Board of    Stockholders may fill vacancies, created   Stockholders may fill vacancies at a
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
                             of directors, by a majority vote of the    the vacancy holds the office until the
                             directors then in office.  The director    time of the next election of directors, at
                             chosen by the current directors to fill    which point the stockholders shall fill
                             the vacancy holds the office for the       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.
- ---------------------------- ------------------------------------------ --------------------------------------------
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
                             unless the director has breached or        loyalty, (2) for acts and omissions not in
                             failed to perform his or her fiduciary     good faith or which involve intentional
                             duties of loyalty, good faith and due      misconduct or a knowing violation of law,
                             care and the breach or failure to          (3) for unlawful payments of dividends or
                             perform constitutes self-dealing,          unlawful stock purchases or redemptions or
                             willful misconduct or recklessness.        (4) for any transaction where the director
                             The foregoing does not apply to the        received an improper personal benefit.
                             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.
- ---------------------------- ------------------------------------------ --------------------------------------------
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,           conduct was unlawful.
                             had no reasonable  cause to believe his
                             or her conduct was unlawful.
- ---------------------------- ------------------------------------------ --------------------------------------------

                                       97
<PAGE>

                               PIONEER AMERICAN STOCKHOLDERS'              PIONEER AMERICAN STOCKHOLDERS'
                                       RIGHTS PRE-MERGER                            RIGHTS POST-MERGER
- ---------------------------- ------------------------------------------ --------------------------------------------
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    exluding 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"
                             Pioneer American common stock.             as 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.
- ---------------------------- ------------------------------------------ --------------------------------------------
Mergers, Share Exchanges     No merger, consolidation, liquidation or   Any business combination that does not
or Asset Sales               dissolution of Pioneer American nor        involve a major stockholder or an
                             any action that would result in the sale   affiliate requires such vote, if any, as
                             or other disposition of all or             may be required by Delaware law.
                             substantially 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 Certificate    Amendments which are proposed by           Amendments generally require approval of a
or Articles of               stockholders, and which have not been      majority of the outstanding stock entitled
Incorporation                previously approved by the Board of        to vote upon the amendment.  Any amendment
                             Directors, shall require the affirmative   to Article ELEVENTH relating to business
                             vote of at least 75% of the votes which    combinations requires the affirmative vote
                             stockholders are entitled to cast.  Any    of at least 80% of the outstanding shares
                             amendment to Article 12, relating to       of voting stock, and if there is a major
                             business combinations, requires the        stockholder, such 80% vote must include
                             affirmative vote of the holders of 70%     the affirmative vote of at least 80% of
                             of the outstanding shares of Pioneer       the outstanding shares of voting stock
                             American common stock.                     held by stockholders other than the major
                                                                        stockholder and its affiliates.
- ---------------------------- ------------------------------------------ --------------------------------------------

                                       98
<PAGE>

                                PIONEER AMERICAN STOCKHOLDERS'              PIONEER AMERICAN STOCKHOLDERS'
                                       RIGHTS PRE-MERGER                            RIGHTS POST-MERGER
- ---------------------------- ------------------------------------------ --------------------------------------------
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           appraisal rights.
                             cash the 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.

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.


                                      99
<PAGE>

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.

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.


                                      100
<PAGE>

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:

         |X|      the director has breached or failed to perform his fiduciary
                  duties of loyalty, good faith and due care, and

         |X|      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:

         |X|      breach of the director's duty of loyalty to the corporation or
                  its stockholders;

         |X|      acts and omissions not in good faith or which involve
                  intentional misconduct or a knowing violation of law;

         |X|      unlawful payments of dividends and unlawful stock purchases or
                  redemptions; or

         |X|      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

         |X|      in good faith and

         |X|      with the reasonable belief that

                  |X|      his or her conduct when acting in the official
                           capacity was in the best interests of the
                           corporation and

                  |X|      in all other cases, the person's conduct was at
                           least not opposed to the best interests of the
                           corporation, and

         |X|      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


                                      101
<PAGE>

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:

         |X|      any merger or consolidation of the corporation

         |X|      the liquidation or dissolution of the corporation

         |X|      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:

         |X|      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

         |X|      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:

         |X|      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;

         |X|      any sale, lease or exchange by NBT of all or a substantial
                  part of its assets to or with a major stockholder;

         |X|      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

         |X|      any reverse stock split of, or exchange of securities, cash or
                  other  properties or assets or any  outstanding  securities of


                                      102
<PAGE>

                  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

         |X|      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

         |X|      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 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:

         |X|      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;

         |X|      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

         |X|      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

         |X|      (A) is the owner of 15% or more of the outstanding voting
                  stock of the corporation or

         |X|      (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.


                                      103
<PAGE>

         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:

         |X|      the agreement of merger does not amend in any respect the
                  certificate of incorporation of such constituent
                  corporation;

         |X|      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

         |X|      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


                                      104
<PAGE>

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.

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:

         |X|      listed on a national securities exchange or designated as a
                  national market system security on an inter-dealer
                  quotation system by the NASD or

         |X|      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:

                  |X|      shares of stock of the surviving corporation;

                  |X|      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;

                  |X|      cash in lieu of fractional shares of such stock; or

                  |X|      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.


                                      105
<PAGE>

                        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.

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:


                                      106
<PAGE>

         |X|      a closing balance sheet and statement of income of Pioneer
                  American for the most recent fiscal year and calendar
                  quarterly period;

         |X|      a statement expressing the estimate of the fair value of the
                  Pioneer American shares; and

         |X|      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:

         |X|      the effective date of the merger;

         |X|      receipt of Pioneer American or NBT of any demands for payment;
                  or

         |X|      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.


                                      107
<PAGE>

         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.

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 will be passed upon by Duane,  Morris & Heckscher LLP,  Washington,  D.C.
Blank Rome  Comisky & McCauley  LLP,  Philadelphia,  Pennsylvania,  counsel  for
Pioneer  American,  will pass on certain federal income tax  consequences of the
merger.

                                     EXPERTS

         The  consolidated  financial  statements of NBT as of December 31, 1998
and 1997 and for each of the three years in the period  ended  December 31, 1998
have been incorporated by reference in this joint proxy statement/prospectus and
registration  statement  in  reliance  upon the report of KPMG LLP,  independent
auditors,  incorporated  herein by reference and upon the authority of said firm
as experts in accounting and auditing.


                                      108
<PAGE>

         The  consolidated  financial  statements  of  Pioneer  American  as  of
December  31, 1998 and 1997 and for each of the three years in the period  ended
December   31,   1998   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 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

         |X|      Annual Report on Form 10-K for the year ended December 31,
                  1998;

         |X|      Quarterly  Reports on Form 10-Q for the  quarters  ended
                  March 31, 1999, June 30, 1999, and September 30, 1999; and

         |X|      Current Reports on Form 8-K, filed with the SEC on August 19,
                  1999, September 13, 1999, and December 16, 1999.

PIONEER AMERICAN HOLDING COMPANY CORP. SEC FILINGS

         |X|      Annual Report on Form 10-K for the year ended December 31,
                  1998;

         |X|      Quarterly  Reports on Form 10-Q for the  quarters  ended March
                  31, 1999, June 30, 1999, and September 30, 1999; and

         |X| Current Report on Form 8-K, filed with the SEC on January 4, 2000.


                                      109
<PAGE>

         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
, 2000 to receive them prior to the NBT annual meeting and Pioneer American
special meeting.

         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 , 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.


                UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS

         The following unaudited pro forma combined balance sheet presents
the financial  position of NBT, Lake Ariel and Pioneer  American as of September
30, 1999, assuming that each merger had occurred as of September 30, 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
nine months  ended  September  30, 1999 and 1998,  and years ended  December 31,
1998,  1997, and 1996 present the combined  historical  results of operations of
NBT, Lake Ariel and Pioneer  American as if each merger had been  consummated as
of the first day of the period  presented.  Pro forma  earnings per common share
are based on the exchange  ratio of 0.9961 with respect to the Lake Ariel merger
and 1.805 with respect to the Pioneer American merger.  The fiscal years of NBT,
Lake  Ariel 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 each merger on the  pooling of  interests  accounting  method.
Under this method of accounting, the recorded assets, liabilities, stockholders'
equity,  income and expense of NBT, Lake Ariel and Pioneer American are combined
and reflected at their historical  amounts,  except as noted in the accompanying
notes.

                                      110
<PAGE>

         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,  which we
incorporate by reference herein,  and of Pioneer  American,  which we include in
this  Joint  Proxy  Statement/Prospectus.   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 September 30, 1999 or at the beginning of the periods or that may
be attained in the future.


                                      111
<PAGE>

<TABLE>
<CAPTION>                                   UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET

                                                                                     AT SEPTEMBER 30, 1999
                                                             ------------------------------------------------------------------

                                                                                                                    NBT
                                                                  NBT           LAKE ARIEL       PRO FORMA       LAKE ARIEL
                                                              BANCORP INC.    BANCORP, INC.     ADJUSTMENTS       COMBINED
                                                                                                                 PRO FORMA
(in thousands)
<S>                                                          <C>             <C>                    <C>        <C>
ASSETS
Cash and cash equivalents                                    $     44,801    $     12,940           $    --    $     57,741
Loans held for sale                                                 3,511             440                --           3,951
Securities available for sale, at fair value                      355,137         173,438                --         528,575
Securities held to maturity (fair value-NBT Bancorp Inc
$41,215, Lake Ariel Bancorp, Inc. $44,944 and Pioneer
American Holding Company Corp. $36,750)                            41,216          47,297                --          88,513

Loans:
   Commercial and agricultural                                    432,950         110,165                --         543,115
   Real estate mortgage                                           174,204         107,200                --         281,404
   Consumer                                                       291,514          63,503                --         355,017
                                                             ------------------------------------------------------------------
    Total loans                                                   898,668         280,868                --       1,179,536
Less allowance for loan losses                                     13,555           2,546                --          16,101
                                                             ------------------------------------------------------------------
   Net loans                                                      885,113         278,322                --       1,163,435
Premises and equipment, net                                        20,853          19,408                --          40,261
Intangible assets, net                                              6,828           2,731                --           9,559
Other assets                                                       20,800          18,341             2,000          41,141
                                                             ------------------------------------------------------------------
TOTAL ASSETS                                                 $  1,378,259    $    552,917           $ 2,000    $  1,933,176
                                                             ==================================================================
LIABILITIES AND STOCKHOLDERS' EQUITY
Deposits:
   Demand (noninterest bearing)                              $    157,618    $     58,111           $    --    $    215,729
   Savings, NOW, and money market                                 386,245         100,114                --         486,359
   Time                                                           550,610         183,809                --         734,419
                                                             ------------------------------------------------------------------
        Total deposits                                          1,094,473         342,034                --       1,436,507
   Short-term borrowings                                          113,163          32,614                --         145,777
   Long-term debt                                                  35,161         138,204                --         173,365
   Other liabilities                                                7,583           5,257             7,200          20,040
                                                             ------------------------------------------------------------------
        Total liabilities                                       1,250,380         518,109             7,200       1,775,689
                                                             ------------------------------------------------------------------

Commitments and contingencies

Stockholders' equity:
   Preferred stock                                                     --              --                --              --
   Common stock                                                    13,016           1,021             4,441          18,478
   Capital surplus                                                111,221          30,012             7,174         148,407
   Retained earnings                                               23,540           9,193           (16,815)         15,918
   Accumulated other comprehensive income (loss)                   (7,117)         (5,418)               --         (12,535)
   Common stock in treasury at cost                               (12,781)             --                --         (12,781)
                                                             ------------------------------------------------------------------
        Total stockholders' equity                                127,879          34,808            (5,200)        157,487
                                                             ------------------------------------------------------------------
TOTAL LIABILITIES AND
   STOCKHOLDERS' EQUITY                                      $  1,378,259    $    552,917           $ 2,000    $  1,933,176
                                                             ==================================================================
</TABLE>

                                      112
<PAGE>

<TABLE>
<CAPTION>
                                                                                      AT SEPTEMBER 30, 1999
                                                             ---------------------------------------------------
                                                                                                          NBT
                                                                     PIONEER                          LAKE ARIEL
                                                                     AMERICAN         PRO FORMA        PIONEER
                                                                 HOLDING COMPANY     ADJUSTMENTS    COMBINED PRO
                                                                      CORP.                             FORMA
(in thousands)
<S>                                                                    <C>                <C>           <C>
ASSETS
Cash and cash equivalents                                              $ 15,844           $   --        $ 73,585
Loans held for sale                                                          --               --           3,951
Securities available for sale, at fair value                            115,547               --         644,122
Securities held to maturity (fair value-NBT Bancorp Inc
$41,215, Lake Ariel Bancorp, Inc. $44,944 and Pioneer
American Holding Company Corp. $36,750)                                  37,444               --         125,957

Loans:
   Commercial and agricultural                                          101,464               --         644,579
   Real estate mortgage                                                  79,376               --         360,780
   Consumer                                                              59,726               --         414,743
                                                             ---------------------------------------------------
    Total loans                                                         240,566               --       1,420,102
Less allowance for loan losses                                            3,000               --          19,101
                                                             ---------------------------------------------------
   Net loans                                                            237,566               --       1,401,001
Premises and equipment, net                                               6,483               --          46,744
Intangible assets, net                                                      562               --          10,121
Other assets                                                              8,408            1,300          50,849
                                                             ---------------------------------------------------
TOTAL ASSETS                                                           $421,854           $1,300      $2,356,330
                                                             ===================================================
LIABILITIES AND STOCKHOLDERS' EQUITY
Deposits:
   Demand (noninterest bearing)                                        $ 48,808           $   --        $264,537
   Savings, NOW, and money market                                       114,205               --         600,564
   Time                                                                 141,619               --         876,038
                                                             ---------------------------------------------------
        Total deposits                                                  304,632               --       1,741,139
   Short-term borrowings                                                     --               --         145,777
   Long-term debt                                                        80,409               --         253,774
   Other liabilities                                                      4,907            5,100          30,047
                                                             ---------------------------------------------------
        Total liabilities                                               389,948            5,100       2,170,737
                                                             ---------------------------------------------------

Commitments and contingencies

Stockholders' equity:
   Preferred stock                                                           --               --              --
   Common stock                                                           2,935            2,235          23,648
   Capital surplus                                                       11,913           (3,965)        156,355
   Retained earnings                                                     21,435           (3,800)         33,553
   Accumulated other comprehensive income (loss)                         (2,647)              --         (15,182)
   Common stock in treasury at cost                                      (1,730)           1,730         (12,781)
                                                             ---------------------------------------------------
        Total stockholders' equity                                       31,906           (3,800)        185,593
                                                             ---------------------------------------------------
TOTAL LIABILITIES AND
   STOCKHOLDERS' EQUITY                                                $421,854           $1,300      $2,356,330
                                                             ===================================================
</TABLE>

See accompanying notes to the unaudited pro forma combined financial statements.


                                      113
<PAGE>

<TABLE>
<CAPTION>
                                      UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

                                                                      FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1999
                                                          -------------------------------------------------------------------

                                                                                                                  NBT
                                                                NBT          LAKE ARIEL        PRO FORMA       LAKE ARIEL
                                                           BANCORP INC.     BANCORP, INC.     ADJUSTMENTS       COMBINED
                                                                                                               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                        $      56,076    $     14,664     $         --     $     70,740
     Securities - taxable                                        18,301           7,785               --           26,086
     Securities - tax-exempt                                        760           1,535               --            2,295
     Other                                                          232             125               --              357
                                                          -------------------------------------------------------------------
         Total interest and fee income                           75,369          24,109               --           99,478
                                                          -------------------------------------------------------------------
Interest expense:
     Deposits                                                    25,344           8,219               --           33,563
     Short-term borrowings                                        3,882             425               --            4,307
     Long-term debt                                               1,098           5,061               --            6,159
                                                          -------------------------------------------------------------------
         Total interest expense                                  30,324          13,705               --           44,029
                                                          -------------------------------------------------------------------
      Net interest income                                        45,045          10,404               --           55,449
     Provision for loan losses                                    2,925             655               --            3,580
                                                          -------------------------------------------------------------------
       Net interest income after provision for loan losses       42,120           9,749               --           51,869
                                                          -------------------------------------------------------------------
Noninterest income:
     Trust                                                        2,505              --               --            2,505
     Service charges on deposit accounts                          3,108           1,492               --            4,600
     Net securities gains                                         1,507             208               --            1,715
     Other                                                        2,086           1,885               --            3,971
                                                          -------------------------------------------------------------------
            Total noninterest income                              9,206           3,585               --           12,791
                                                          -------------------------------------------------------------------

Noninterest expense:
     Salaries and employee benefits                              14,166           4,223               --           18,389
     Office supplies and postage                                  1,330             431               --            1,761
     Occupancy                                                    2,109           1,068               --            3,177
     Equipment                                                    1,974           1,082               --            3,056
     Professional fees and outside services                       2,010             408               --            2,418
     Data processing and communications                           2,843             199               --            3,042
     Amortization of intangible assets                              745             229               --              974
     Other operating                                              2,763           1,714               --            4,477
                                                          -------------------------------------------------------------------
             Total noninterest expense                           27,940           9,354               --           37,294
                                                          -------------------------------------------------------------------
     Income before income taxes                                  23,386           3,980               --           27,366
     Income taxes                                                 9,030             955               --            9,985
                                                          -------------------------------------------------------------------
             Net income                                   $      14,356    $      3,025     $         --     $     17,381
                                                          ===================================================================

Weighted Average Shares Outstanding:
     Basic                                                       13,022           4,840               --           17,843

     Diluted                                                     13,165           4,971               --           18,117

Earnings per share:
     Basic                                                $        1.10    $       0.63     $         --     $       0.97

     Diluted                                              $        1.09    $       0.61     $         --     $       0.96
</TABLE>


                                      114
<PAGE>

<TABLE>
<CAPTION>
                        UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

                                                            FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1999
                                                          -----------------------------------------------
                                                                                                NBT
                                                            PIONEER                         LAKE ARIEL
                                                            AMERICAN         PRO FORMA        PIONEER
                                                            HOLDING         ADJUSTMENTS    COMBINED PRO
                                                          COMPANY CORP.                        FORMA
Consolidated Statements of Income:
(in thousands, except per share data)
<S>                                                            <C>             <C>             <C>
Interest and fee income:
     Loans and loans held for sale                             $ 14,642        $     --        $ 85,382
     Securities - taxable                                         6,167              --          32,253
     Securities - tax-exempt                                        943              --           3,238
     Other                                                          198              --             555
                                                          ---------------------------------------------
         Total interest and fee income                           21,950              --         121,428
                                                          ---------------------------------------------
Interest expense:
     Deposits                                                     7,918              --          41,481
     Short-term borrowings                                           --              --           4,307
     Long-term debt                                               3,246              --           9,405
                                                          ---------------------------------------------
         Total interest expense                                  11,164              --          55,193
                                                          ---------------------------------------------
      Net interest income                                        10,786              --          66,235
     Provision for loan losses                                      280              --           3,860
                                                          ---------------------------------------------
       Net interest income after provision for loan losses       10,506              --          62,375
                                                          ---------------------------------------------
Noninterest income:
     Trust                                                           --              --           2,505
     Service charges on deposit accounts                          1,199              --           5,799
     Net securities gains                                            88              --           1,803
     Other                                                          829              --           4,800
                                                          ---------------------------------------------
            Total noninterest income                              2,116              --          14,907
                                                          ---------------------------------------------

Noninterest expense:
     Salaries and employee benefits                               4,038              --          22,427
     Office supplies and postage                                    409              --           2,170
     Occupancy                                                      806              --           3,983
     Equipment                                                      731              --           3,787
     Professional fees and outside services                         738              --           3,156
     Data processing and communications                             335              --           3,377
     Amortization of intangible assets                               29              --           1,003
     Other operating                                              1,370              --           5,847
                                                          ---------------------------------------------
             Total noninterest expense                            8,456              --          45,750
                                                          ---------------------------------------------
     Income before income taxes                                   4,166              --          31,532
     Income taxes                                                 1,110              --          11,095
                                                          ---------------------------------------------
             Net income                                        $  3,056        $     --        $ 20,437
                                                          =============================================

Weighted Average Shares Outstanding:
     Basic                                                        2,914              --          23,104

     Diluted                                                      2,942              --          23,427

Earnings per share:
     Basic                                                      $  1.05        $     --         $  0.88

     Diluted                                                    $  1.04        $     --         $  0.87

See  accompanying  notes to the  unaudited  pro forma combined financial statements.
</TABLE>

                                      115
<PAGE>

<TABLE>
<CAPTION>
                                      UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

                                                                      FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1998
                                                          ------------------------------------------------------------------

                                                                                                                  NBT
                                                                NBT          LAKE ARIEL        PRO FORMA       LAKE ARIEL
                                                           BANCORP INC.     BANCORP, INC.     ADJUSTMENTS       COMBINED
                                                                                                               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                        $     52,701     $     13,765     $          --      $   66,466
     Securities - taxable                                       22,233            6,521                --          28,754
     Securities - tax-exempt                                       836            1,282                --           2,118
     Other                                                         210              124                --             334
                                                          ------------------------------------------------------------------
         Total interest and fee income                          75,980           21,692                --          97,672
                                                          ------------------------------------------------------------------

Interest expense:
     Deposits                                                   28,423            8,077                --          36,500
     Short-term borrowings                                       4,525              102                --           4,627
     Long-term debt                                                326            4,180                --           4,506
                                                          ------------------------------------------------------------------
         Total interest expense                                 33,274           12,359                --          45,633
                                                          ------------------------------------------------------------------
     Net interest income                                        42,706            9,333                --          52,039
     Provision for loan losses                                   3,550              490                --           4,040
                                                          ------------------------------------------------------------------
     Net interest income after provision for loan losses        39,156            8,843                --          47,999
                                                          ------------------------------------------------------------------

Noninterest income:
      Trust                                                      2,407               --                --           2,407
      Service charges on deposit accounts                        2,725            1,114                --           3,839
      Net securities gains                                         613               80                --             693
      Other                                                      1,883            2,039                --           3,922
                                                          ------------------------------------------------------------------
          Total noninterest income                               7,628            3,233                --          10,861
                                                          ------------------------------------------------------------------

Noninterest expense:
      Salaries and employee benefits                            14,214            3,663                --          17,877
      Office supplies and postage                                1,406              443                --           1,849
      Occupancy                                                  2,037              958                --           2,995
      Equipment                                                  1,728              880                --           2,608
      Professional fees and outside services                     1,987              332                --           2,319
      Data processing and communications                         2,635              160                --           2,795
      Amortization of intangible assets                            817              123                --             940
      Other operating                                            3,824            1,479                --           5,303
                                                          ------------------------------------------------------------------
          Total noninterest expense                             28,648            8,038                --          36,686
                                                          ------------------------------------------------------------------
      Income before income taxes                                18,136            4,038                --          22,174
      Income taxes                                               3,623              930                --           4,553
                                                          ------------------------------------------------------------------
          Net income                                      $     14,513     $      3,108     $          --      $   17,621
                                                          ==================================================================

Weighted Average Shares Outstanding:
      Basic                                                     13,241            4,791                --          18,014
      Diluted                                                   13,509            4,911                --          18,401

Earnings per share:
      Basic                                               $       1.10     $       0.65     $          --      $     0.98
      Diluted                                             $       1.07     $       0.64     $          --      $     0.96

</TABLE>

                                      116
<PAGE>

<TABLE>
<CAPTION>

                                      UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

                                                             FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1998
                                                          -------------------------------------------------
                                                                                                NBT
                                                              PIONEER                        LAKE ARIEL
                                                             AMERICAN       PRO FORMA        PIONEER
                                                              HOLDING       ADJUSTMENTS    COMBINED PRO
                                                           COMPANY CORP.                       FORMA
Consolidated Statements of Income:
(in thousands, except per share data)
<S>                                                             <C>           <C>              <C>
Interest and fee income:
     Loans and loans held for sale                              $14,277       $      --        $ 80,743
     Securities - taxable                                         5,824              --          34,578
     Securities - tax-exempt                                        828              --           2,946
     Other                                                          253              --             587
                                                          ---------------------------------------------
         Total interest and fee income                           21,182              --        $118,854
                                                         ---------------------------------------------

Interest expense:
     Deposits                                                     8,002              --          44,502
     Short-term borrowings                                           23              --           4,650
     Long-term debt                                               2,590              --           7,096
                                                          ---------------------------------------------
         Total interest expense                                  10,615              --          56,248
                                                          ---------------------------------------------
     Net interest income                                         10,567              --          62,606
     Provision for loan losses                                      450              --           4,490
                                                          ---------------------------------------------
     Net interest income after provision for loan losses         10,117              --          58,116
                                                          ---------------------------------------------

Noninterest income:
      Trust                                                          --              --           2,407
      Service charges on deposit accounts                         1,035              --           4,874
      Net securities gains                                          298              --             991
      Other                                                         757              --           4,679
                                                          ---------------------------------------------
          Total noninterest income                                2,090              --          12,951
                                                          ---------------------------------------------

Noninterest expense:
      Salaries and employee benefits                              3,989              --          21,866
      Office supplies and postage                                   382              --           2,231
      Occupancy                                                     769              --           3,764
      Equipment                                                     563              --           3,171
      Professional fees and outside services                        797              --           3,116
      Data processing and communications                            355              --           3,150
      Amortization of intangible assets                              29              --             969
      Other operating                                             1,246              --           6,549
                                                          ---------------------------------------------
          Total noninterest expense                               8,130              --          44,816
                                                          ---------------------------------------------
      Income before income taxes                                  4,077              --          26,251
      Income taxes                                                1,109              --           5,662
                                                          ---------------------------------------------
          Net income                                            $ 2,968       $      --        $ 20,589
                                                          =============================================

Weighted Average Shares Outstanding:
      Basic                                                       2,890              --          23,230
      Diluted                                                     2,953              --          23,730

Earnings per share:
      Basic                                                     $  1.03       $      --        $   0.89
      Diluted                                                   $  1.01       $      --        $   0.87

</TABLE>
See accompanying notes to the unaudited pro forma combined financial statements.


                                      117
<PAGE>

<TABLE>
<CAPTION>
                                      UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

                                                                       FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1998
                                                            -----------------------------------------------------------------

                                                                                                                   NBT
                                                                 NBT           LAKE ARIEL       PRO FORMA      LAKE ARIEL
                                                             BANCORP INC.    BANCORP, INC.     ADJUSTMENTS      COMBINED
                                                                                                                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                        $      70,947     $      18,452      $        --     $   89,399
     Securities - taxable                                        28,742             8,848               --         37,590
     Securities - tax-exempt                                      1,086             1,694               --          2,780
     Other                                                          305               226               --            531
                                                          -------------------------------------------------------------------
         Total interest and fee income                          101,080            29,220               --        130,300
                                                          -------------------------------------------------------------------
Interest expense:
     Deposits                                                    37,201            10,857               --         48,058
     Short-term borrowings                                        6,014               139               --          6,153
     Long-term debt                                                 462             5,744               --          6,206
                                                          -------------------------------------------------------------------
         Total interest expense                                  43,677            16,740               --         60,417
                                                          -------------------------------------------------------------------
     Net interest income                                         57,403            12,480               --         69,883
     Provision for loan losses                                    4,599             1,130               --          5,729
                                                          -------------------------------------------------------------------

     Net interest income after provision for loan losses         52,804            11,350               --         64,154
                                                          -------------------------------------------------------------------

Noninterest income:
     Trust                                                        3,115                --               --          3,115
     Service charges on deposit accounts                          3,749             1,576               --          5,325
     Net securities gains                                           624               432               --          1,056
     Other                                                        2,491             2,926               --          5,417
                                                          -------------------------------------------------------------------
           Total noninterest income                               9,979             4,934               --         14,913
                                                          -------------------------------------------------------------------
 Noninterest expense:
     Salaries and employee benefits                              19,202             5,013               --         24,215
     Office supplies and postage                                  1,912               609               --          2,521
     Occupancy                                                    2,843             1,288               --          4,131
     Equipment                                                    2,375             1,219               --          3,594
     Professional fees and outside services                       2,836               539               --          3,375
     Data processing and communications                           3,577               217               --          3,794
     Amortization of intangible assets                            1,070               210               --          1,280
     Other operating                                              5,313             2,357               --          7,670
                                                          -------------------------------------------------------------------
          Total noninterest expense                              39,128            11,452               --         50,580
                                                          -------------------------------------------------------------------
     Income before income taxes                                  23,655             4,832               --         28,487
     Income taxes                                                 4,553             1,061               --          5,614
                                                          -------------------------------------------------------------------
          Net income                                      $      19,102     $       3,771      $        --     $   22,873
                                                          ===================================================================

Weighted Average Shares Outstanding:
     Basic                                                       13,198             4,796               --         17,976
     Diluted                                                     13,474             4,906               --         18,361

Earnings per share:
     Basic                                                $        1.45     $        0.79     $         --     $     1.27
     Diluted                                              $        1.42     $        0.77     $         --     $     1.25

</TABLE>

                                      118
<PAGE>

<TABLE>
<CAPTION>
                                      UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

                                                           FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1998
                                                          -----------------------------------------------
                                                                                               NBT
                                                             PIONEER                        LAKE ARIEL
                                                             AMERICAN        PRO FORMA        PIONEER
                                                             HOLDING        ADJUSTMENTS    COMBINED PRO
                                                          COMPANY CORP.                       FORMA
Consolidated Statements of Income:
(in thousands, except per share data)
<S>                                                             <C>             <C>            <C>
Interest and fee income:
     Loans and loans held for sale                              $19,093         $    --        $108,492
     Securities - taxable                                         7,615              --          45,205
     Securities - tax-exempt                                      1,114              --           3,894
     Other                                                          480              --           1,011
                                                          ---------------------------------------------
         Total interest and fee income                           28,302              --         158,602
                                                          ---------------------------------------------
Interest expense:
     Deposits                                                    10,840              --          58,898
     Short-term borrowings                                           23              --           6,176
     Long-term debt                                               3,456              --           9,662
                                                          ---------------------------------------------
         Total interest expense                                  14,319              --          74,736
                                                          ---------------------------------------------
     Net interest income                                         13,983              --          83,866
     Provision for loan losses                                      420              --           6,149
                                                          ---------------------------------------------

     Net interest income after provision for loan losses         13,563              --          77,717
                                                          ---------------------------------------------

Noninterest income:
     Trust                                                           --              --           3,115
     Service charges on deposit accounts                          1,404              --           6,729
     Net securities gains                                           511              --           1,567
     Other                                                        1,046              --           6,463
                                                          ---------------------------------------------
           Total noninterest income                               2,961              --          17,874
                                                          ---------------------------------------------
 Noninterest expense:
     Salaries and employee benefits                               5,071              --          29,286
     Office supplies and postage                                    506              --           3,027
     Occupancy                                                    1,027              --           5,158
     Equipment                                                      773              --           4,367
     Professional fees and outside services                       1,027              --           4,402
     Data processing and communications                             483              --           4,277
     Amortization of intangible assets                               39              --           1,319
     Other operating                                              2,041              --           9,711
                                                          ---------------------------------------------
          Total noninterest expense                              10,967              --          61,547
                                                          ---------------------------------------------
     Income before income taxes                                   5,557              --          34,044
     Income taxes                                                 1,535              --           7,149
                                                          ---------------------------------------------
          Net income                                            $ 4,022         $    --        $ 26,895
                                                          =============================================

Weighted Average Shares Outstanding:
     Basic                                                        2,894              --          23,199
     Diluted                                                      2,953              --          23,691

Earnings per share:
     Basic                                                      $  1.39         $    --        $   1.16
     Diluted                                                    $  1.36         $    --        $   1.14

</TABLE>
See accompanying notes to the unaudited pro forma combined financial statements.


                                      119
<PAGE>

<TABLE>
<CAPTION>
                                      UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

                                                                      FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1997
                                                          -------------------------------------------------------------------

                                                                                                                   NBT
                                                                NBT            LAKE ARIEL       PRO FORMA      LAKE ARIEL
                                                            BANCORP INC.     BANCORP, INC.     ADJUSTMENTS      COMBINED
                                                                                                                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                        $      64,781     $      16,907     $          --    $    81,688
     Securities - taxable                                        29,887             5,892                --         35,779
     Securities - tax-exempt                                      1,179             1,578                --          2,757
     Other                                                          334               273                --            607
                                                          -------------------------------------------------------------------
          Total interest and fee income                          96,181            24,650                --        120,831
                                                          -------------------------------------------------------------------

Interest expense:
     Deposits                                                    35,234            10,395                --         45,629
     Short-term borrowings                                        6,581               112                --          6,693
     Long-term debt                                                 707             3,018                --          3,725
                                                          -------------------------------------------------------------------
           Total interest expense                                42,522            13,525                --         56,047
                                                          -------------------------------------------------------------------
       Net interest income                                       53,659            11,125                --         64,784
     Provision for loan losses                                    3,505               780                --          4,285
                                                          -------------------------------------------------------------------
        Net interest income after provision for loan losses      50,154            10,345                --         60,499
                                                          -------------------------------------------------------------------
   Noninterest income:
     Trust                                                        2,675                --                --          2,675
     Service charges on deposit accounts                          3,695             1,247                --          4,942
     Net securities gains (losses)                                (337)               214                --           (123)
     Other                                                        2,033             1,940                --          3,973
                                                          -------------------------------------------------------------------
            Total noninterest income                              8,066             3,401                --         11,467
                                                          -------------------------------------------------------------------
   Noninterest expense:
     Salaries and employee benefits                              17,905             4,206                --         22,111
     Office supplies and postage                                  1,801               449                --          2,250
     Occupancy                                                    2,598             1,156                --          3,754
     Equipment                                                    1,700               932                --          2,632
     Professional fees and outside services                       2,201               284                --          2,485
     Data processing and communications                           2,789               177                --          2,966
     Amortization of intangible assets                            1,351               154                --          1,505
     Other operating                                              4,825             1,852                --          6,677
                                                          -------------------------------------------------------------------
          Total noninterest expense                              35,170             9,210                --         44,380
                                                          -------------------------------------------------------------------
      Income before income taxes                                 23,050             4,536                --         27,586
     Income taxes                                                 8,301             1,105                --          9,406
                                                          -------------------------------------------------------------------
           Net income                                     $      14,749     $       3,431     $          --    $    18,180
                                                          ===================================================================

Weighted Average Shares Outstanding:
     Basic                                                       13,176             3,935                --         17,095
     Diluted                                                     13,335             4,073                --         17,393

Earnings per share:
     Basic                                                $        1.12     $        0.88     $          --   $       1.06
     Diluted                                              $        1.11     $        0.84     $          --   $       1.05

</TABLE>

                                      120
<PAGE>

<TABLE>
<CAPTION>
                           UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

                                                           FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1997
                                                          ----------------------------------------------
                                                                                                 NBT
                                                             PIONEER                          LAKE ARIEL
                                                             AMERICAN         PRO FORMA        PIONEER
                                                             HOLDING         ADJUSTMENTS    COMBINED PRO
                                                          COMPANY CORP.                         FORMA
Consolidated Statements of Income:
(in thousands, except per share data)
<S>                                                              <C>            <C>             <C>
Interest and fee income:
     Loans and loans held for sale                               $18,101        $     --        $ 99,789
     Securities - taxable                                          7,063              --          42,842
     Securities - tax-exempt                                       1,023              --           3,780
     Other                                                           320              --             927
                                                          ----------------------------------------------
          Total interest and fee income                           26,507              --         147,338
                                                          ----------------------------------------------

Interest expense:
     Deposits                                                     11,337              --          56,966
     Short-term borrowings                                            10              --           6,703
     Long-term debt                                                1,498              --           5,223
                                                          ----------------------------------------------
           Total interest expense                                 12,845              --          68,892
                                                          ----------------------------------------------
       Net interest income                                        13,662              --          78,446
     Provision for loan losses                                       535              --           4,820
                                                          ----------------------------------------------
        Net interest income after provision for loan losses       13,127              --          73,626
                                                          ----------------------------------------------
   Noninterest income:
     Trust                                                            --              --           2,675
     Service charges on deposit accounts                           1,397              --           6,339
     Net securities gains (losses)                                   157              --              34
     Other                                                           907              --           4,880
                                                          ----------------------------------------------
            Total noninterest income                               2,461              --          13,928
                                                          ----------------------------------------------
   Noninterest expense:
     Salaries and employee benefits                                5,040              --          27,151
     Office supplies and postage                                     507              --           2,757
     Occupancy                                                     1,026              --           4,780
     Equipment                                                       685              --           3,317
     Professional fees and outside services                          900              --           3,385
     Data processing and communications                              456              --           3,422
     Amortization of intangible assets                                39              --           1,544
     Other operating                                               1,427              --           8,104
                                                          ----------------------------------------------
          Total noninterest expense                               10,080              --          54,460
                                                          ----------------------------------------------
      Income before income taxes                                   5,508              --          33,094
     Income taxes                                                  1,500              --          10,906
                                                          ----------------------------------------------
           Net income                                            $ 4,008        $     --        $ 22,188
                                                          ==============================================

Weighted Average Shares Outstanding:
     Basic                                                         2,850              --          22,239
     Diluted                                                       2,939              --          22,698

Earnings per share:
     Basic                                                       $  1.41        $     --        $   1.00
     Diluted                                                     $  1.36        $     --        $   0.98

</TABLE>

See accompanying notes to the unaudited pro forma combined financial statements.


                                      121
<PAGE>

<TABLE>
<CAPTION>
                                      UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

                                                                     FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1996
                                                          -------------------------------------------------------------------

                                                                                                                  NBT
                                                                NBT          LAKE ARIEL        PRO FORMA       LAKE ARIEL
                                                           BANCORP INC.     BANCORP, INC.     ADJUSTMENTS       COMBINED
                                                                                                               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                        $      57,660      $    14,592      $       --       $   72,252
     Securities - taxable                                        25,109            4,409              --           29,518
     Securities - tax-exempt                                      1,527            1,104              --            2,631
     Other                                                           91              170              --              261
                                                          -------------------------------------------------------------------
         Total interest and fee income                           84,387           20,275              --          104,662
                                                          -------------------------------------------------------------------
Interest expense:
     Deposits                                                    31,942            8,957              --           40,899
     Short-term borrowings                                        3,745               83              --            3,828
     Long-term debt                                                 678            1,143              --            1,821
                                                          -------------------------------------------------------------------
         Total interest expense                                  36,365           10,183              --           46,548
                                                          -------------------------------------------------------------------
      Net interest income                                        48,022           10,092              --           58,114
     Provision for loan losses                                    3,175              650              --            3,825
                                                          -------------------------------------------------------------------
     Net interest income after provision for loan losses         44,847            9,442              --           54,289
                                                          -------------------------------------------------------------------
 Noninterest income:
     Trust                                                        2,642               --              --            2,642
     Service charges on deposit accounts                          3,372            1,217              --            4,589
     Net securities gains                                         1,179               43              --            1,222
     Other                                                        1,669            1,446              --            3,115
                                                          -------------------------------------------------------------------
           Total noninterest income                               8,862            2,706              --           11,568
                                                          -------------------------------------------------------------------

Noninterest expense:
     Salaries and employee benefits                              17,817            3,684              --           21,501
     Office supplies and postage                                  1,796              483              --            2,279
     Occupancy                                                    2,391              909              --            3,300
     Equipment                                                    1,765              824              --            2,589
     Professional fees and outside services                       2,382              337              --            2,719
     Data processing and communications                           2,280              144              --            2,424
     Amortization of intangible assets                            1,580              108              --            1,688
     Other operating                                              4,411            1,508              --            5,919
                                                          -------------------------------------------------------------------
         Total noninterest expense                               34,422            7,997              --           42,419
                                                          -------------------------------------------------------------------
     Income before income taxes                                  19,287            4,151              --           23,438
     Income taxes                                                 7,108            1,120              --            8,228
                                                          -------------------------------------------------------------------
         Net income                                       $      12,179      $     3,031      $       --       $   15,210
                                                          ===================================================================

Weighted Average Shares Outstanding:
     Basic                                                       13,058            3,860              --           16,903
     Diluted                                                     13,140            3,870              --           16,995

Earnings per share:
     Basic                                                $        0.93      $      0.78      $       --       $     0.90
     Diluted                                              $        0.93      $      0.78      $       --       $     0.89

</TABLE>

                                      122
<PAGE>

<TABLE>
<CAPTION>
                                      UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

                                                           FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1996
                                                          ----------------------------------------------
                                                                                                 NBT
                                                               PIONEER                        LAKE ARIEL
                                                               AMERICAN       PRO FORMA        PIONEER
                                                               HOLDING       ADJUSTMENTS    COMBINED PRO
                                                            COMPANY CORP.                       FORMA

Consolidated Statements of Income:
(in thousands, except per share data)
<S>                                                             <C>              <C>           <C>
Interest and fee income:
     Loans and loans held for sale                              $ 18,345         $    --       $  90,597
     Securities - taxable                                          5,144              --          34,662
     Securities - tax-exempt                                         595              --           3,226
     Other                                                           274              --             535
                                                          ----------------------------------------------
         Total interest and fee income                            24,358              --         129,020
                                                          ----------------------------------------------
Interest expense:
     Deposits                                                     10,799              --          51,698
     Short-term borrowings                                            57              --           3,885
     Long-term debt                                                   18              --           1,839
                                                          ----------------------------------------------
         Total interest expense                                   10,874              --          57,422
                                                          ----------------------------------------------
      Net interest income                                         13,484              --          71,598
     Provision for loan losses                                       500              --           4,325
                                                          ----------------------------------------------
     Net interest income after provision for loan losses          12,984              --          67,273
                                                          ----------------------------------------------
 Noninterest income:
     Trust                                                            --              --           2,642
     Service charges on deposit accounts                           1,227              --           5,816
     Net securities gains                                             --              --           1,222
     Other                                                           785              --           3,900
                                                          ----------------------------------------------
           Total noninterest income                                2,012              --          13,580
                                                          ----------------------------------------------

Noninterest expense:
     Salaries and employee benefits                                5,061              --          26,562
     Office supplies and postage                                     536              --           2,815
     Occupancy                                                       857              --           4,157
     Equipment                                                       622              --           3,211
     Professional fees and outside services                          738              --           3,457
     Data processing and communications                              408              --           2,832
     Amortization of intangible assets                                39              --           1,727
     Other operating                                               1,488              --           7,407
                                                          ----------------------------------------------
         Total noninterest expense                                 9,749              --          52,168
                                                          ----------------------------------------------
     Income before income taxes                                    5,247              --          28,685
     Income taxes                                                  1,543              --           9,771
                                                          ----------------------------------------------
         Net income                                             $  3,704         $    --        $ 18,914
                                                          ==============================================

Weighted Average Shares Outstanding:
     Basic                                                         2,812              --          21,979
     Diluted                                                       2,932              --          22,287

Earnings per share:
     Basic                                                      $   1.32         $    --       $    0.86
     Diluted                                                    $   1.26         $    --       $    0.85

</TABLE>
See accompanying notes to the unaudited pro forma combined financial statements.


                                      123
<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 Lake  Ariel  for  each  applicable  period  based on the
exchange ratio of .9961.

         (2) The pro forma entries to record the issuance of .9961 shares of NBT
Common Stock in exchange for each share of Lake Ariel Common Stock and to record
the adjustment of the stated value of Lake Ariel Common Stock from $.21 to $1.00
as of September 30, 1999 were determined as follows:

<TABLE>
<S>                                                                             <C>              <C>
NBT Common Shares issued                                                                              13,015,789
Lake Ariel Common Shares issued
(4,859,771 common shares times exchange ratio of .9961)                                                4,840,818
                                                                                                 ---------------

Combined pro forma total common shares issued                                                         17,856,607
Stated value per common share                                                                    $          1.00
                                                                                                 ---------------

Combined pro forma total stated value                                                            $    17,856,607

Actual par value of common stock at September 30, 1999:
         NBT                                                                    $  13,015,789
         Lake Ariel                                                                 1,020,552    $    14,036,341
                                                                                ---------------  ---------------

Entry to record increase in stated value:
         Capital Surplus                                                        $   3,820,266
                  Common Stock                                                                   $     3,820,266

Entry to record 5% stock dividend to NBT Bancorp Inc.  shareholders of record at
December  1, 1999 that NBT paid on  December  15,  1999.  To record  issuance of
621,143 shares at a value of $18.70 per share.

Retained Earnings                                                               $  11,615,374
         Common Stock                                                                            $       621,143
                  Surplus                                                                        $    10,994,231

Summary of pro forma entries above

Retained Earnings                                                               $  11,615,374
         Common Stock                                                                            $     4,441,409
                  Surplus                                                                        $     7,173,965
</TABLE>

For purposes of the above calculations, it is assumed that no dissenters' shares
existed.


                                      124
<PAGE>

         (3) Authorized, issued and outstanding share information is as follows
             at September 30, 1999:
<TABLE>
<CAPTION>

- --------------------------------------- ---------------------- --------------------- -------------------------------
                                                 NBT                LAKE ARIEL          NBT/LAKE ARIEL PRO FORMA
- --------------------------------------- ---------------------- --------------------- -------------------------------
<S>                                            <C>                   <C>                         <C>
Preferred
- --------------------------------------- ---------------------- --------------------- -------------------------------
   Authorized                                  2,500,000             1,000,000                   2,500,000
- --------------------------------------- ---------------------- --------------------- -------------------------------
   Issued and Outstanding                         -----                 -----                      -----
- --------------------------------------- ---------------------- --------------------- -------------------------------
Common
- --------------------------------------- ---------------------- --------------------- -------------------------------
   Stated Value                                    $1.00                  $.21                       $1.00
- --------------------------------------- ---------------------- --------------------- -------------------------------
   Authorized                                 15,000,000            10,000,000                  15,000,000 (A)
- --------------------------------------- ---------------------- --------------------- -------------------------------
   Issued                                     13,636,932             4,859,771                  18,477,750
- --------------------------------------- ---------------------- --------------------- -------------------------------
   Outstanding                                13,046,443             4,859,771                  17,887,261
- --------------------------------------- ---------------------- --------------------- -------------------------------
</TABLE>

            (A) In conjunction  with the merger,  NBT will amend its Certificate
of  Incorporation  to provide for the  authorization of an additional 15 million
shares of common stock by increasing the authorized shares from 15 million to 30
million.

         (4) 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.\Lake  Ariel Combined common shares issued                                           18,477,750
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                                                          23,647,824
Stated value per common share                                                                 $             1.00
                                                                                              ------------------
Combined pro forma total stated value                                                         $       23,647,824

Actual stated value of common stock at September 30, 1999:

NBT Bancorp Inc.\Lake Ariel Combined                                        $     18,477,750
Pioneer American Holding Company Corp
             (after retirement of treasury shares)                                 2,864,307  $       21,342,057
                                                                            ----------------  ------------------
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>

                                      125
<PAGE>

     (5) The unaudited pro forma  combined  balance sheet at September 30, 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:

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


                                      126
<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:

   |X|   Summary -- Our Reasons for the Merger;

   |X|   Summary -- Selected Historical and Pro Forma Combined Financial Data;

   |X|   The Merger -- Background of the Merger;

   |X|   The Merger -- Recommendation of the NBT Board and NBT's Reasons for the
         Merger;

   |X|   The Merger -- Recommendation of the Pioneer American Board and Pioneer
         American's Reasons for the Merger;

   |X|   The Merger -- Opinion of NBT's Financial Advisor;

   |X|   The Merger -- Opinion of Pioneer American's Financial Advisor; and

   |X|   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.


                                      127
<PAGE>
                                NBT BANCORP INC.

               PROXY SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

   The  undersigned  hereby  appoints [ ] and [ ], 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 Binghamton
Regency  Hotel and  Conference  Center,  225 Water  Street,  One Sarbro  Square,
Binghamton,  New York on April 25,  2000 at 10:00  a.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, 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 issuance by NBT of its common stock to the former stock-
     holders of Pioneer  American  Holding  Company  Corp.  in the merger and
     ratify the Agreement and Plan of Merger,  dated as of December 7, 1999, 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

4    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 April 25, 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,
     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>


                          AGREEMENT AND PLAN OF MERGER

                                     AMONG

                                NBT BANCORP INC.

                           LEVON ACQUISITION COMPANY

                                      AND

                     PIONEER AMERICAN HOLDING COMPANY CORP.









                                December 7, 1999

<TABLE>
<CAPTION>

                                TABLE OF CONTENTS

                                                                                                               PAGE
<S>      <C>                                                                                                     <C>
1.       Combination..............................................................................................1

         1.1      First Merger....................................................................................1
         1.2      Effect of First Merger..........................................................................2
         1.3      Second Merger...................................................................................3
         1.4      Effect of Second Merger.........................................................................3
         1.5      Consideration for First Merger..................................................................5
         1.6      No Fractional Shares............................................................................5
         1.7      Dividends; Interest.............................................................................5
         1.8      Designation of Exchange Agent...................................................................6
         1.9      Notice of Exchange..............................................................................7
         1.10     Acts to Carry Out This Merger Plan..............................................................7
         1.11     Treatment of Stock Options......................................................................7
         1.12     Stock Option Agreement..........................................................................8
         1.13     Executive Officers and Directors of PAHC........................................................8
         1.14     Employee Benefits...............................................................................9
         1.15     Voting Agreements..............................................................................10
         1.16     Optional Bank Merger Transaction...............................................................10

2.       Effective Time..........................................................................................11

         2.1      PAHC Shareholder Approval......................................................................11
         2.2      NBT Shareholder Approval.......................................................................11
         2.3      Federal Reserve Approval.......................................................................11
         2.4      OCC Approval...................................................................................11
         2.5      Pennsylvania Department of Banking Approval....................................................11
         2.6      Other Regulatory Approvals.....................................................................11
         2.7      Expiration of Stays............................................................................12
         2.8      Mutual Agreement...............................................................................12

3.       Conditions Precedent to Performance of Obligations of the Parties.......................................12

         3.1      Regulatory Approvals...........................................................................12
         3.2      Registration Statement ........................................................................12
         3.3      Approval by Shareholders of PAHC...............................................................12
         3.4      Approval by Shareholders of NBTB...............................................................13
         3.5      Federal Income Taxation........................................................................13
         3.6      Adverse Legislation............................................................................13
         3.7      Absence of Litigation..........................................................................13

<PAGE>

4.       Conditions Precedent to Performance of the Obligations
                  of NBTB........................................................................................13

         4.1      Representations and Warranties; Performance of Obligations.....................................14
         4.2      Opinion of PAHC Counsel........................................................................14
         4.3      Opinion of PAHC Litigation Counsel.............................................................14
         4.4      No Adverse Development.........................................................................14
         4.5      Consolidated Net Worth.........................................................................15
         4.6      Loan Loss Reserve..............................................................................15
         4.7      CRA Rating.....................................................................................15
         4.8      Employment Agreement...........................................................................15
         4.9      Releases.......................................................................................15
         4.10     Accounting Treatment...........................................................................15
         4.11     Affiliates' Agreement..........................................................................15
         4.12     Fairness Opinion...............................................................................16

5.       Conditions Precedent to Performance of Obligations of PAHC..............................................16

         5.1      Representations and Warranties; Performance of Obligations.....................................16
         5.2      Opinion of NBTB Counsel........................................................................16
         5.3      No Adverse Developments........................................................................16
         5.4      Status of NBTB Common Stock....................................................................17
         5.5      Change-in-Control Agreements...................................................................17
         5.6      Board of Directors.............................................................................17
         5.7      Fairness Opinion...............................................................................17
         5.8      Accounting Treatment...........................................................................17

6.       Representations and Warranties of PAHC..................................................................17

         6.1      Organization, Powers, and Qualification........................................................17
         6.2      Execution and Performance of Agreement........................................................ 18
         6.3      Absence of Violations..........................................................................18
         6.4      Compliance with Agreements.....................................................................18
         6.5      Binding Obligations............................................................................19
         6.6      Absence of Default; Due Authorization..........................................................19
         6.7      Compliance with BHC Act; Certain Banking Regulatory Matters....................................20
         6.8      Subsidiaries...................................................................................21


                                      -ii-
<PAGE>

         6.9      Capital Structure..............................................................................21
         6.10     Articles of Incorporation, Bylaws, and Minute Books............................................22
         6.11     Books and Records..............................................................................23
         6.12     Regulatory Approvals and Filings, Contracts, Commitments, etc..................................23
         6.13     Financial Statements...........................................................................24
         6.14     Call Reports; Bank Holding Company Reports.....................................................25
         6.15     Absence of Undisclosed Liabilities.............................................................25
         6.16     Absence of Certain Developments................................................................25
         6.17     Reserve for Possible Credit Losses.............................................................26
         6.18     Tax Matters....................................................................................26
         6.19     Consolidated Net Worth.........................................................................28
         6.20     Examinations...................................................................................28
         6.21     Reports........................................................................................28
         6.22     FIRA Compliance and Other Transactions with Affiliates.........................................28
         6.23     SEC Registered Securities......................................................................29
         6.24     Legal Proceedings..............................................................................29
         6.25     Absence of Governmental Proceedings............................................................29
         6.26     Federal Deposit Insurance......................................................................29
         6.27     Other Insurance................................................................................29
         6.28     Labor Matters..................................................................................30
         6.29     Employee Benefit Plans.........................................................................30
         6.30     Compensation...................................................................................31
         6.31     Fiduciary Activities...........................................................................32
         6.32     Environmental Liability........................................................................32
         6.33     Intangible Property............................................................................33
         6.34     Real and Personal Property.....................................................................33
         6.35     Loans, Leases, and Discounts...................................................................34
         6.36     Material Contracts.............................................................................34
         6.37     Employment and Severance Arrangements..........................................................34
         6.38     Material Contract Defaults.....................................................................35
         6.39     Capital Expenditures...........................................................................35
         6.40     Repurchase Agreements..........................................................................35
         6.41     Internal Controls: Year 2000 Problems..........................................................35
         6.42     Dividends......................................................................................36
         6.43     Brokers and Advisers...........................................................................36
         6.44     Interest Rate Risk Management Instruments......................................................36
         6.45     Accounting Treatment...........................................................................36


                                      -iii-
<PAGE>

         6.46     COBRA Matters..................................................................................37
         6.47     Disclosure.....................................................................................37
         6.48     Regulatory and Other Approvals.................................................................37

7.       Covenants of PAHC.......................................................................................37

         7.1      Rights of Access...............................................................................37
         7.2      Monthly and Quarterly Financial Statements;
                           Minutes of Meetings and Other Materials.............................................. 38
         7.3      Extraordinary Transactions.....................................................................38
         7.4      Preservation of Business.......................................................................39
         7.5      Comfort Letter.................................................................................40
         7.6      Affiliates' Agreement..........................................................................40
         7.7      Pooling Treatment..............................................................................41
         7.8      Shareholders' Meeting..........................................................................41
         7.9      Dividend Coordination..........................................................................41
         7.10     Inconsistent Activities........................................................................41
         7.11     COBRA Obligations..............................................................................42
         7.12     Updated Schedules..............................................................................42
         7.13     Subsequent Events..............................................................................43

8.       Representations and Warranties of NBTB..................................................................43

         8.1      Organization, Powers, and Qualification........................................................43
         8.2      Execution and Performance of Agreement.........................................................43
         8.3      Binding Obligations; Due Authorization.........................................................43
         8.4      Absence of Default.............................................................................44
         8.5      Capital Structure..............................................................................44
         8.6      Books and Records..............................................................................45
         8.7      Financial Statements...........................................................................45
         8.8      Nasdaq Reporting...............................................................................45
         8.9      Absence of Certain Developments................................................................46
         8.10     Brokers and Advisers...........................................................................46
         8.11     Disclosure.....................................................................................46
         8.12     Regulatory and Other Approvals.................................................................46



                                      -iv-
<PAGE>

9.       Covenants of NBTB.......................................................................................46

         9.1      Rights of Access...............................................................................47
         9.2      Securities Reports.............................................................................47
         9.3      Shareholders' Meeting..........................................................................47
         9.4      Nasdaq Approval................................................................................47
         9.5      Options........................................................................................47
         9.6      Indemnification of Directors and Officers......................................................47
         9.7      Subsequent Events..............................................................................48

10.      Closing.................................................................................................48

         10.1     Place and Time of Closing......................................................................48
         10.2     Events to Take Place at Closing................................................................48

11.      Termination, Damages for Breach, Waiver, and Amendment..................................................49

         11.1     Termination by Reason of Lapse of Time.........................................................49
         11.2     Grounds for Termination........................................................................49
         11.3     Effect of Termination..........................................................................52
         11.4     Waiver of Terms or Conditions..................................................................53
         11.5     Amendment......................................................................................53

12.      General Provisions......................................................................................53

         12.1     Allocation of Costs and Expenses...............................................................53
         12.2     Mutual Cooperation.............................................................................54
         12.3     Form of Public Disclosures.....................................................................54
         12.4     Confidentiality................................................................................54
         12.5     Claims of Brokers..............................................................................55
         12.6     Information for Applications and Registration Statement........................................55
         12.7     Standard of Materiality and of Material Adverse Effect.........................................56
         12.8     Adjustments for Certain Events.................................................................57
         12.9     Counterparts...................................................................................57
         12.10    Entire Agreement...............................................................................57
         12.11    Survival of Representations, Warranties, and Covenants.........................................57
         12.12    Section Headings...............................................................................57


                                      -v-
<PAGE>


         12.13    Notices........................................................................................58
         12.14    Choice of Law and Venue........................................................................59
         12.15    Knowledge of a Party...........................................................................59
         12.16    Binding Agreement..............................................................................59
</TABLE>


                                      -vi-
<PAGE>

                                  APPENDIX A


                          AGREEMENT AND PLAN OF MERGER



     THIS  AGREEMENT  AND PLAN OF MERGER made as of the seventh day of December,
1999,  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

<PAGE>

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.

         (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.


                                      -2-
<PAGE>

         (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  containing  the names and addresses of the holders of record
of PAHC's Common Stock at the Effective Time.

         (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:


                                      -3-
<PAGE>

         (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,  immunities,  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.


                                      -4-
<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


                                      -5-
<PAGE>

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 certificates 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.

         (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.


                                      -6-
<PAGE>

         (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 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


                                      -7-
<PAGE>

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.


                                      -8-
<PAGE>

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 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) Subject to the fiduciary duties of its directors to NBTB, NBTB will
cause  Joseph G.  Nasser  ("Nasser"),  Gene E.  Goldenziel  ("Goldenziel"),  and
Richard  Chojnowski  ("Chojnowski")  to be elected or  appointed as directors of
NBTB with terms  commencing  at the  Effective  Time,  with Nasser to serve as a
director  of the class  whose  term  expires in 2000,  Goldenziel  to serve as a
director of the class whose term expires in 2001,  and  Chojnowski to serve as a
director of the class whose term expires in 2002.

         (e) If the  Merger  has  occurred  prior to the date of  mailing of the
proxy materials to NBTB  stockholders in connection with the 2000 annual meeting
of the  stockholders  of NBTB,  NBTB will propose to its  stockholders  in those
proxy  materials that Nasser be reelected to the board of directors of NBTB as a
member of the class whose term shall expire in 2003.

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,


                                      -9-
<PAGE>

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."

         (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.


                                      -10-
<PAGE>

         (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 consummation


                                      -11-
<PAGE>

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.


                                      -12-
<PAGE>

     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 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:


                                      -13-
<PAGE>

     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,  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.


                                      -14-
<PAGE>

         (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"):


                                      -15-
<PAGE>

         (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

         (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 representations of NBTB made in this
Agreement.


                                      -16-
<PAGE>

     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.

     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.


                                      -17-
<PAGE>

     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 maintained in accordance with such laws and  regulations;  and the
policies and practices of PA Bank with respect to all 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


                                      -18-
<PAGE>

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 termination,  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


                                      -19-
<PAGE>

securities commissions,  the Department,  the Secretary of State of the State of
Delaware, and the Secretary of State of the Commonwealth of Pennsylvania.

         (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.


                                      -20-
<PAGE>

         (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 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


                                      -21-
<PAGE>

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 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


                                      -22-
<PAGE>

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


                                      -23-
<PAGE>

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;

         (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.


                                      -24-
<PAGE>

     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 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  transactions 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


                                      -25-
<PAGE>

with respect to PAHC and PA Bank, (b) no material  deterioration  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  consolidated
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 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


                                      -26-
<PAGE>

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
Statements.  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 properties 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 identification 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.


                                      -27-
<PAGE>

         (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 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


                                      -28-
<PAGE>

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.

     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


                                      -29-
<PAGE>

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  agreements,  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
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


                                      -30-
<PAGE>

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


                                      -31-
<PAGE>

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  compensation  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.

     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.


                                      -32-
<PAGE>

         (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 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


                                      -33-
<PAGE>

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  properties  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,  arrangements,  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


                                      -34-
<PAGE>

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.

     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 PROBLEM.

         (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


                                      -35-
<PAGE>

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.

         (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.


                                      -36-
<PAGE>

     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, 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.


                                      -37-
<PAGE>

     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


                                      -38-
<PAGE>

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  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


                                      -39-
<PAGE>

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 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.


                                      -40-
<PAGE>

     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.


                                      -41-
<PAGE>

         (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) 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.


                                      -42-
<PAGE>

     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  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.


                                      -43-
<PAGE>

     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 transactions 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.

         (b)  None of the  shares  of NBTB  Common  Stock  has  been  issued  in
violation of the preemptive rights of any shareholder.


                                      -44-
<PAGE>

         (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  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 "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.


                                      -45-
<PAGE>

     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
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:


                                      -46-
<PAGE>

     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  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,  judgments,  fines,


                                      -47-
<PAGE>

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


                                      -48-
<PAGE>

         (c)  the Second Merger and the Bank Merger shall be effected.


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:


                                      -49-
<PAGE>

              (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).

              (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


                                      -50-
<PAGE>

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:


     COMPANY                                        WEIGHTING     BASE PRICE

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%
                                                      ========

                  (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;


                                      -51-
<PAGE>

         (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 acknowledges  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.


                                      -52-
<PAGE>

     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 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 securities laws the stock of NBTB to
be received by the shareholders of PAHC shall be deemed to be incurred on behalf


                                      -53-
<PAGE>

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 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.


                                      -54-
<PAGE>

     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  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


                                      -55-
<PAGE>

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


                                      -56-
<PAGE>

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  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.


                                      -57-
<PAGE>

     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

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.


                                      -58-
<PAGE>

           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:     /S/ DARYL R. FORSYTHE
                                        -----------------------------------
                                        Daryl R. Forsythe
                                        President and Chief Executive Officer



                                By:     /S/ JOHN D. ROBERTS
                                        ----------------------------------
                                        John D. Roberts
                                        Senior Vice President and Secretary



                                      -59-
<PAGE>

                                LEVON ACQUISITION COMPANY



                                By:     /S/ DARYL R. FORSYTHE
                                        -----------------------------------
                                        Daryl R. Forsythe
                                        President and Chief Executive Officer



                                By:     /S/ JOHN D. ROBERTS
                                        ----------------------------------
                                        John D. Roberts
                                        Secretary




                                PIONEER AMERICAN HOLDING COMPANY CORP.



                                By:     /S/ JOHN W. REUTHER
                                        -----------------------------------
                                        John W. Reuther
                                        President and Chief Executive Officer



                                By:     /S/ ANTOINETTE STICKER
                                        -----------------------------------
                                        Antoinette Sticker
                                        Secretary




                                      -60-
<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.





                              /S/ DAVID R. THELEMAN
                              ---------------------
                                  Notary Public

                                DAVID R. THELEMAN
                        Notary Public, State of New York
                            Broome County, # 4940266
                         Commission Expires Aug. 8, 2000





                                      -61-
<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.





                              /S/ DAVID R. THELEMAN
                              ---------------------
                                  Notary Public

                                DAVID R. THELEMAN
                        Notary Public, State of New York
                            Broome County, # 4940266
                         Commission Expires Aug. 8, 2000






                                      -62-
<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.





                             /S/ LISA ANN BUCHINSKI
                             ----------------------
                                 Notary Public

                                  Notarial Seal
                        Lisa Ann Buchinski, Notary Public
                          Carbondale, Lackawanna County
                       My Commission Expires Oct. 16, 2000






                                      -63-
<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.



/S/ JOSEPH G. NASSER                              /S/ MICHAEL M. MURPHY
- ------------------------                          ---------------------------


/S/ R. CHOJNOWSKI                                 /S/ JOHN W. WALSKI
- ------------------------                          ---------------------------


/S/ ELDORE SEBASTIANELLI                          /S/ GENE E. GOLDENZIEL
- ------------------------                          ---------------------------


/S/ JOHN W. REUTHER                               /S/ MARGARET O'CONNOR-FLETCHER
- ------------------------                          ------------------------------





                                      -64-
<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


<PAGE>


                                   APPENDIX B
               FAIRNESS OPINION OF MCCONNELL, BUDD & DOWNES, INC.


                         [TO BE FILED BY AMENDMENT]

<PAGE>



                                   APPENDIX C
                  FAIRNESS OPINION OF DANIELSON ASSOCIATES INC.



                        [TO BE FILED BY AMENDMENT]

<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.

<PAGE>

      (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).

    (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).



                                      E-2
<PAGE>

    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.

    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


                                      E-3
<PAGE>

dissenters  who gave due notice of intention to demand payment of the fair value
of their shares and who refrained  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.

    (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.


                                      E-4
<PAGE>

    (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.

    (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


                                      E-5
<PAGE>

    (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, 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


                                      E-6
<PAGE>

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.


                                      E-7
<PAGE>

                 PART II: INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         ARTICLE VI.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

         Section 1. Each person who was or is made a party or is  threatened  to
be made a party to or is otherwise  involved in any action,  suit or proceeding,
whether  civil,  criminal,   administrative  or  investigative   (hereinafter  a
"proceeding"),  by reason of the fact that he or she is or was a director  or an
officer  of  the  Corporation  or is or  was  serving  at  the  request  of  the
Corporation  as a director of another  corporation  or of a  partnership,  joint
venture,  trust or other  enterprise,  or as a plan fiduciary with respect to an
employee benefit plan (hereinafter an  "indemnitee"),  whether the basis of such
proceeding is alleged action in an official capacity as a Director,  officer, or
plan fiduciary or in any other capacity while serving as a Director,  officer or
plan fiduciary, shall be indemnified and held harmless by the Corporation to the
fullest extent  authorized by the Delaware General  Corporation Law, as the same
exists or may  hereafter  be amended,  against all expense,  liability  and loss
(including  attorneys' fees,  judgments,  fines, ERISA excise taxes or penalties
and  amounts  paid  in  settlement)  reasonably  incurred  or  suffered  by such
indemnitee in connection therewith;  provided, however, that, except as provided
in Section 3 of this Article VI with respect to proceedings to enforce rights to
indemnification,   the  Corporation  shall  indemnify  any  such  indemnitee  in
connection with a proceeding (or part thereof) initiated by such indemnitee only
if such proceeding (or part thereof) was authorized by the Board of Directors of
the Corporation.

         Section 2. The right to indemnification  conferred in Section 1 of this
Article VI shall  include the right to be paid by the  Corporation  the expenses
(including attorney's fees) incurred in defending any such proceeding in advance
of its final disposition  (hereinafter an "advancement of expenses");  provided,
however,  that, if the Delaware General Corporation Law requires, an advancement
of expenses  incurred by an  indemnitee  in his or her capacity as a director or
officer  (and not in any other  capacity in which  service was or is rendered by
such indemnitee,  including, without limitation,  service to an employee benefit
plan) shall be made only upon  delivery  to the  Corporation  of an  undertaking
(hereinafter an "undertaking"), by or on behalf of such indemnitee, to repay all
amounts so advanced  if it shall  ultimately  be  determined  by final  judicial
decision  from which there is no further right to appeal  (hereinafter  a "final
adjudication")  that such  indemnitee is not entitled to be indemnified for such
expenses under this Section 2 or otherwise. The rights to indemnification and to
the  advancement  of expenses  conferred  in Sections 1 and 2 of this Article VI
shall be contract  rights and such rights shall continue as to an indemnitee who
has ceased to be a Director  or officer  and shall  inure to the  benefit of the
indemnitee's heirs, executors and administrators.

         Section 3. If a claim under  Sections 1 or 2 of this  Article VI is not
paid in full by the Corporation within sixty (60) days after a written claim has
been  received  by  the  Corporation,  except  in the  case  of a  claim  for an
advancement  of expenses,  in which case the  applicable  period shall be twenty
(20) days,  the  indemnitee  may at any time  thereafter  bring suit against the
Corporation to recover the unpaid amount of the claim. If successful in whole or
in part in any such suit, or in a suit brought by the  Corporation to recover an
advancement of expenses pursuant to the terms of an undertaking,  the indemnitee
shall be entitled to be paid also the expense of  prosecuting  or defending such
suit.  In (i)  any  suit  brought  by the  indemnitee  to  enforce  a  right  to
indemnification  hereunder  (but  not in a suit  brought  by the  indemnitee  to
enforce a right to an  advancement  of expenses) it shall be a defense that, and
(ii) in any suit  brought  by the  Corporation  to  recover  an  advancement  of
expenses  pursuant  to the terms of an  undertaking,  the  Corporation  shall be
entitled to recover such expenses upon a final adjudication that, the indemnitee
has not  met any  applicable  standard  for  indemnification  set  forth  in the
Delaware  General  Corporation  Law.  Neither  the  failure  of the  Corporation
(including  its  Board  of  Directors,   independent   legal  counsel,   or  its
stockholders)  to have made a  determination  prior to the  commencement of such
suit that  indemnification  of the  indemnitee  is  proper in the  circumstances
because the indemnitee  has met the applicable  standard of conduct set forth in
the  Delaware  General  Corporation  Law,  nor an  actual  determination  by the
Corporation (including its Board of Directors, independent legal counsel, or its


                                      II-1
<PAGE>

stockholders)  that the  indemnitee  has not met  such  applicable  standard  of
conduct,  shall  create  a  presumption  that  the  indemnitee  has  not met the
applicable  standard  of conduct  or, in the case of such a suit  brought by the
indemnitee,  be a defense to such suit. In any suit brought by the indemnitee to
enforce a right to indemnification  or to an advancement of expenses  hereunder,
or brought by the Corporation to recover an advancement of expenses  pursuant to
the terms of an  undertaking,  the burden of proving that the  indemnitee is not
entitled to be  indemnified,  or to such  advancement  of  expenses,  under this
Section 15 or otherwise shall be on the Corporation.

         Section  4. The rights to  indemnification  and to the  advancement  of
expenses  conferred in this Article VI shall not be exclusive of any other right
which  any  person  may  have  or  hereafter  acquire  under  any  statute,  the
Corporation's  Certificate  of  Incorporation,   By-Laws,   agreement,  vote  of
stockholders or disinterested Directors or otherwise.

         Section 5. The Corporation may maintain  insurance,  at its expense, to
protect itself and any Director,  officer,  employee or agent of the Corporation
or of another corporation, partnership, joint venture, trust or other enterprise
against any expense,  liability or loss,  whether or not the  Corporation  would
have the power to indemnify such person against such expense,  liability or loss
under the Delaware General Corporation Law.

         Section 6. The Corporation  may, to the extent  authorized from time to
time by the  Board of  Directors,  grant  rights to  indemnification  and to the
advancement  of expenses to any  employee  or agent of the  Corporation,  or any
person  serving at the request of the  Corporation  as an  officer,  employee or
agent of another entity, to the fullest extent of the provisions of this Section
with respect to the indemnification and advancement of expenses of Directors and
officers of the Corporation.


ITEM 21. EXHIBITS AND FINANCIAL STATEMENTS.

(a)The following  exhibits are filed as part of this  Registration  Statement or
incorporated herein by reference:

EXHIBIT NO.           DESCRIPTION

2.1                   Agreement  and Plan of Merger by and  between  NBT Bancorp
                      Inc. and Pioneer American Holding Company Corp.,  dated as
                      of December 7, 1999,  (included as Appendix A in the Joint
                      Proxy  Statement/Prospectus  included in this Registration
                      Statement;  Exhibits  I, II,  VI, and IX  incorporated  by
                      reference  to  Exhibits  2.3,  2.4,  2.5 and 2.6 of  NBT's
                      Schedule 13D filed on December 16, 1999).

5                     Opinion of Duane, Morris & Heckscher LLP as to the
                      legality of the securities.*

8                     Opinion of Blank Rome Comisky & McCauley LLP as to certain
                      tax matters. [To be filed by amendment]

10.1                  Stock Option Agreement, dated as of December 7, 1999, by
                      and between NBT and Pioneer American (incorporated by
                      reference to Exhibit 2.3 of NBT's Schedule 13D filed
                      December 16, 1999)


                                      II-2
<PAGE>

10.2                  Form of Employment Agreement between NBT Bancorp Inc. and
                      John W. Reuther (incorporated by reference to Exhibit
                      2.4 of NBT's Schedule 13D filed December 16, 1999)

10.3                  Form of Change-in-Control Agreement between NBT Bancorp
                      Inc. and John W. Reuther, Patricia A. Cobb and James E.
                      Jackson (incorporated by reference to Exhibit 2.5 of NBT's
                      Schedule 13D filed December 16, 1999)

10.4                  Shareholder Voting Agreement between NBT Bancorp Inc. and
                      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, and John W. Walski
                      (incorporated by reference to Exhibit 2.6 of NBT's
                      Schedule 13D filed December 16, 1999)

13.1                  Pioneer American Holding Company Corp. Annual Report on
                      SEC Form 10-K for the year ended December 31, 1999
                      (incorporated by reference to Pioneer American Holding
                      Company Corp.'s Form 10-K for the year ended December
                      31, 1999, SEC File No. 0-14506)

23.1                  Consent of KPMG LLP, independent auditors for NBT Bancorp
                      Inc.*

23.2                  Consent of KPMG LLP, independent auditors for Pioneer
                      American Holding Company Corp.*

23.3                  Consent of Danielson Associates Inc. [To be filed by
                      amendment]

23.4                  Consent of McConnell, Budd & Downes, Inc. [To be filed by
                      amendment]

23.5                  Consent of Duane, Morris & Heckscher LLP (included in
                      Exhibit 5).

23.6                  Consent of Blank Rome Comisky & McCauley LLP (included in
                      Exhibit 8).

23.7                  Consent of Joseph G. Nasser *

23.8                  Consent of Gene E. Goldenziel *

23.9                  Consent of Richard Chojnowski *

24.1                  Power of Attorney (contained on signature pages to this
                      Registration Statement).

99.1                  Opinion of McConnell, Budd & Downes, Inc. as to the
                      fairness of the transaction to NBT (attached as Appendix B
                      to the Joint Proxy Statement/ Prospectus included in this
                      Registration Statement -- [To be filed by amendment]).


                                      II-3
<PAGE>

99.2                  Opinion of Danielson Associates Inc. as to the fairness of
                      the transaction to stockholders of Pioneer American
                      (attached as Appendix C to the Joint Proxy Statement/
                      Prospectus included in this Registration Statement -- [To
                      be filed by amendment]).


- ---------------
*  Filed herewith.

    (b)  No financial statement schedules  are  required to be filed  herewith
         pursuant to Item 21(b) of this Form.

    (c)  The fairness opinion of McConnell, Budd & Downes, Inc. is attached
         as Appendix B to the Joint Proxy Statement/Prospectus included in this
         Registration Statement.  The fairness opinion of Danielson Associates
         Inc. is attached as Appendix C to the Joint Proxy Statement/Prospectus
         included in this Registration Statement.



ITEM 22. UNDERTAKINGS.

       The undersigned registrant hereby undertakes as follows:

       (1) that, for purposes of determining  any liability under the Securities
Act of 1933, each filing of the  registrant's  annual report pursuant to Section
13(a)  or  Section  15(d)  of the  Securities  Exchange  Act  of  1934  that  is
incorporated by reference in the registration  statement shall be deemed to be a
new registration  statement relating to the securities offered therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

       (2) to  deliver or cause to be  delivered  with the  prospectus,  to each
person to whom the  prospectus  is sent or given,  the latest  annual  report to
security  holders  that is  incorporated  by  reference  in the  prospectus  and
furnished  pursuant to and meeting the  requirements of Rule 14a-3 or Rule 14c-3
under  the  Securities  Exchange  Act of  1934;  and,  where  interim  financial
information  required to be presented by Article 3 of Regulation  S-X is not set
forth in the prospectus,  to deliver, or cause to be delivered to each person to
whom the  prospectus  is sent or given,  the  latest  quarterly  report  that is
specifically incorporated by reference in the prospectus to provide such interim
financial information.

       (3) that  prior to any public  reoffering  of the  securities  registered
hereunder  through the use of a prospectus which is a part of this  registration
statement,  by any person or party who is deemed to be an underwriter within the
meaning of Rule 145(c), such reoffering  prospectus will contain the information
called for by the  applicable  registration  form with respect to reofferings by
persons who may be deemed  underwriters,  in addition to the information  called
for by the other items of the applicable form.

       (4) that every  prospectus  (i) that is filed  pursuant to paragraph  (3)
immediately preceding, or (ii) that purports to meet the requirements of Section
10(a)(3) of the  Securities  Act of 1933, as amended,  and is used in connection
with an offering of  securities  subject to Rule 415, will be filed as a part of
an  amendment  to the  registration  statement  and will not be used  until such
amendment is  effective,  and that,  for purposes of  determining  any liability


                                      II-4
<PAGE>

under the Securities Act of 1933,  each such  post-effective  amendment shall be
deemed to be a new  registration  statement  relating to the securities  offered
therein,  and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

       (5) that insofar as  indemnification  for  liabilities  arising under the
Securities Act of 1933 may be permitted to directors,  officers and  controlling
persons of the  registrant  pursuant to the provisions  described  under Item 20
above, or otherwise,  the registrant has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy
as expressed in the Act and is,  therefore,  unenforceable.  In the event that a
claim for  indemnification  against such liabilities  (other than the payment by
the  registrant  of  expenses  incurred  or  paid  by  a  director,  officer  or
controlling  person of the registrant in the  successful  defense of any action,
suit or proceeding) is asserted by such director,  officer or controlling person
in connection with the securities being registered,  the registrant will, unless
in the  opinion  of its  counsel  the matter  has been  settled  by  controlling
precedent,  submit to a court of appropriate  jurisdiction  the question whether
such  indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.

       (6) to  respond to  requests  for  information  that is  incorporated  by
reference into the Joint Proxy Statement/Prospectus  pursuant to Items 4, 10(b),
11 or 13 of Form S-4, within one business day of receipt of such request, and to
send the  incorporated  documents  by first class mail or other  equally  prompt
means. This includes information  contained in documents filed subsequent to the
Effective Date of the registration  statement  through the date of responding to
the request.

       (7) to  supply by means of a  post-effective  amendment  all  information
concerning a transaction,  and the company being acquired involved therein, that
was not the subject of and included in the registration statement when it became
effective.

       (8) to file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:

              (i)  to include any prospectus required by Section 10(a)(3) of the
Securities Act of 1933;

              (ii) to  reflect  in the  prospectus  any facts or events  arising
after the  effective  date of the  registration  statement  (or the most  recent
post-effective  amendment  thereof)  which,  individually  or in the  aggregate,
represent a fundamental  change in the information set forth in the registration
statement.

              (iii) to include any material information with respect to the plan
of distribution not previously  disclosed in the  registration  statement or any
material change to such information in the registration statement.

       (9) to remove from  registration by means of a  post-effective  amendment
any of the securities being registered which remain unsold at the termination of
the offering.


                                      II-5
<PAGE>

                                   SIGNATURES

         Pursuant  to the  requirements  of the  Securities  Act  of  1933,  the
registrant  has duly  caused  this  registration  statement  to be signed on its
behalf by the undersigned,  thereunto duly authorized,  in Norwich,  New York on
this 23rd day of February, 2000.

                                                     NBT Bancorp Inc.

                                                     /S/ DARYL R. FORSYTHE
                                                     ---------------------
                                                     By: Daryl R. Forsythe
                                                     President and Chief
                                                     Executive Officer


         KNOW  ALL MEN BY THESE  PRESENTS,  that  each  person  whose  signature
appears below hereby  constitutes  and appoints Daryl R. Forsythe and Michael J.
Chewens, and each of them, such person's true and lawful  attorneys-in-fact  and
agents with full power of substitution and  resubstitution,  for such person and
in such person's name,  place and stead, in any and all capacities,  to sign any
and all amendments  (including  post-effective  amendments) to this registration
statement, and to file the same, with all exhibits thereto, and all documents in
connection therewith, with the Securities and Exchange Commission, granting unto
each said  attorneys-in-fact  and  agents,  full power and  authority  to do and
perform each and every act and thing  requisite  and  necessary  to be done,  as
fully to all  intents and  purposes as such person  might or could do in person,
hereby ratifying and confirming all that any said  attorneys-in-fact and agents,
or either of them,  or any  substitute  of them,  may lawfully do or cause to be
done by virtue hereof.

         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
registration  statement  has  been  signed  by  the  following  persons  in  the
capacities and on the dates indicated.

<TABLE>
<CAPTION>

SIGNATURE                           CAPACITY                                    DATE
- ---------                           --------                                    ----

<S>                                 <C>                                         <C>
/S/ DARYL R. FORSYTHE               President, Chief Executive Officer          February 23, 2000
- ----------------------              and Director (Principal Executive
Daryl R. Forsythe                   Officer)

/S/ MICHAEL J. CHEWENS              Executive Vice President,                   February 23, 2000
- ----------------------
Michael J. Chewens                  Chief Financial Officer, and Treasurer
                                    of NBT and NBT Bank (Principal
                                    Financial and Accounting Officer)


                                      II-6
<PAGE>

/S/ EVERETTE A. GILMOUR             Chairman of the Board of Directors          February 23, 2000
- -----------------------
Everett A. Gilmour


/S/ J. PETER CHAPLIN                Director                                    February 23, 2000
- -----------------------
J. Peter Chaplin

/S/ PETER B. GREGORY                Director                                    February 23, 2000
- -----------------------
Peter B. Gregory

                                    Director
- -----------------------------
Andrew S. Kowalczyk, Jr.

/S/ DAN B. MARSHMAN                 Director                                    February 23, 2000
- --------------------
Dan B. Marshman

/S/ JOHN C. MITCHELL                Director                                    February 23, 2000
- ------------------------
John C. Mitchell

                                    Director
- ---------------------
William L. Owens

/S/ PAUL O. STILLMAN                Director                                    February 23, 2000
- ------------------------
Paul O. Stillman

</TABLE>

                                      II-7
<PAGE>

                                  EXHIBIT INDEX

EXHIBIT NO.           DESCRIPTION

2.1                   Agreement  and Plan of Merger by and  between  NBT Bancorp
                      Inc. and Pioneer  American  Holding Company Corp. dated as
                      of December 7, 1999,  (included as Appendix A in the Joint
                      Proxy  Statement/Prospectus  included in this Registration
                      Statement;  Exhibits  I, II,  VI, and IX  incorporated  by
                      reference  to  Exhibits  2.3,  2.4,  2.5 and 2.6 of  NBT's
                      Schedule 13D filed on December 16, 1999).

5                     Opinion of Duane, Morris & Heckscher LLP as to the
                      legality of the securities.*

8                     Opinion of Blank Rome Comisky & McCauley LLP as to certain
                      tax matters. [To be filed by amendment]

10.1                  Stock Option Agreement, dated as of December 7, 1999, by
                      and between NBT and Pioneer American (incorporated by
                      reference to Exhibit 2.3 of NBT's Schedule 13D filed
                      December 16, 1999).

10.2                  Form of Employment Agreement between NBT Bancorp Inc. and
                      John W. Reuther (incorporated by reference to Exhibit
                      2.4 of NBT's Schedule 13D filed December 16, 1999)

10.3                  Form of Change-in-Control Agreement between NBT Bancorp
                      Inc. and John W. Reuther, Patricia A. Cobb and James E.
                      Jackson (incorporated by reference to Exhibit 2.5 of NBT's
                      Schedule 13D filed December 16, 1999)

10.4                  Shareholder Voting Agreement between NBT Bancorp Inc. and
                      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, and John W. Walski
                      (incorporated by reference to Exhibit 2.6 of NBT's
                      Schedule 13D filed December 16, 1999)

13.1                  Pioneer American Holding Company Corp. Annual Report on
                      SEC Form 10-K for the year ended December 31, 1999
                      (incorporated by reference to Pioneer American Holding
                      Company Corp.'s Form 10-K for the year ended December
                      31, 1999, SEC File No. 0-22092)

23.1                  Consent of KPMG LLP, independent auditors for NBT Bancorp
                      Inc.*

23.2                  Consent of  KPMG LLP, independent auditors for Pioneer
                      American Holding Company Corp.*

23.3                  Consent of Danielson Associates Inc. [To be filed by
                      amendment]


                                      II-8
<PAGE>

23.4                  Consent of McConnell, Budd & Downes, Inc. [To be filed by
                      amendment]

23.5                  Consent of Duane, Morris & Heckscher LLP (included in
                      Exhibit 5).

23.6                  Consent of Blank Rome Comisky & McCauley LLP (included in
                      Exhibit 8).

23.7                  Consent of Joseph G. Nasser *

23.8                  Consent of Gene E. Goldenziel *

23.9                  Consent of Richard Chojnowski *

24.1                  Power of Attorney (contained on signature pages to this
                      Registration Statement).

99.1                  Opinion of McConnell, Budd & Downes, Inc. as to the
                      fairness of the transaction to NBT (attached as Appendix B
                      to the Joint Proxy Statement/Prospectus included in this
                      Registration Statement -- [To be filed by amendment]).

99.2                  Opinion of Danielson Associates Inc. as to the fairness of
                      the transaction to stockholders of Pioneer American
                      (attached as Appendix C to the Joint Proxy Statement/
                      Prospectus included in this Registration Statement -- [To
                      be filed by amendment]).

- ---------------------
*  Filed herewith.


                                      II-9
<PAGE>



                                    EXHIBIT 5

                          Duane, Morris & Heckscher LLP
                         1667 K Street, N.W., Suite 700
                           Washington, D.C. 20006-1608
                                 (202) 776-7800

                                 February 23, 2000


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

Gentlemen:

             We  have  acted  as  counsel  to  NBT  Bancorp   Inc.,  a  Delaware
corporation ("NBT") in connection with the Agreement and Plan of Merger dated as
of December 7, 1999,  (the "Plan of  Merger")  between NBT and Pioneer  American
Holding Company Corp., a Pennsylvania corporation ("Pioneer American"),  whereby
Pioneer  American  will be  merged  into  NBT,  with  NBT  being  the  surviving
corporation (the "Merger"). At the Effective Time of the Merger, the outstanding
shares of Pioneer  American  common stock,  par value $1.00 per share  ("Pioneer
American  Common Stock"),  will be canceled and  immediately  converted into the
right of holders of Pioneer  American  Common Stock to receive,  in exchange for
each share of Pioneer  American Common Stock,  1.805 shares of NBT common stock,
$.01 par value per share, ( referred to herein as "NBT Common Stock"),  up to an
aggregate of  approximately  5,200,000 shares (the "Shares") of NBT Common Stock
for all of the outstanding shares of Pioneer American Common Stock.

             We are  also  acting  as  counsel  to NBT in  connection  with  the
Registration Statement on Form S-4 (the "Registration Statement") to be filed by
NBT with the Securities  and Exchange  Commission for the purpose of registering
under the Securities Act of 1933, as amended,  the Shares into which outstanding
shares of Pioneer American Common Stock will be converted upon  effectiveness of
the Merger. This opinion is being furnished for the purpose of being filed as an
exhibit to the Registration Statement.

             In connection  with this  opinion,  we have  examined,  among other
things:

                  (1) an executed copy of the Plan of Merger;
                  (2) a copy certified to our satisfaction of the Certificate
                      of Incorporation  of NBT as in  effect  on the date
                      hereof;
                  (3) copies certified to our satisfaction of resolutions
                      adopted by the Board of Directors of NBT on
                      December 7, 1999, including  resolutions  approving the
                      Plan of Merger and the issuance of the Shares;  and
                  (4) such other documents, corporate proceedings, and statutes
                      as we considered necessary to enable us to furnish
                      this opinion.
<PAGE>

             We have assumed for the purpose of this opinion that:

                  (1) the Plan of Merger has been duly and  validly  authorized,
                      executed,  and  delivered  by Pioneer  American,  and such
                      authorization  remains  fully  effective  and has not been
                      revised,  superseded  or  rescinded as of the date of this
                      opinion; and

                  (2) the Merger will be consummated in accordance with the
                      terms of the Plan of Merger.

         We have assumed the  authenticity  of all documents  submitted to us as
originals,  the  genuineness  of all  signatures,  the legal capacity of natural
persons, and the conformity to the originals of all documents submitted to us as
copies.  We have  assumed  that the  certifications  and  representations  dated
earlier than the date hereof on which we have expressed reliance herein continue
to remain accurate,  insofar as material to our opinions, from such earlier date
through the date hereof.

             Based upon the  foregoing and limited in all respects to matters of
Delaware  law,  we are of the  opinion  that the  Shares  to be issued by NBT as
described  in the  Registration  Statement,  when and to the  extent  issued  in
accordance  with the Plan of  Merger,  will be  validly  issued,  fully paid and
nonassessable.

             We hereby  consent to the  filing of this  opinion as an exhibit to
the  Registration  Statement and to the reference to us under the caption "Legal
Matters"  in  the  Joint  Proxy  Statement/Prospectus  forming  a  part  of  the
Registration Statement.

                                            Very truly yours,

                                            /s/ DUANE, MORRIS & HECKSCHER LLP

<PAGE>


                                    EXHIBIT 8

                  OPINION OF BLANK ROME COMISKY & MCCAULEY LLP




                           [To be filed by amendment]


<PAGE>


                                  EXHIBIT 23.1

                         CONSENT OF INDEPENDENT AUDITORS


The Board of Directors
NBT Bancorp Inc.:

       We consent to incorporation by reference in the registration statement on
Form S-4  related  to the  registration  of shares for the  merger  between  NBT
Bancorp Inc. and Pioneer  American  Holding Company Corp.,  filed by NBT Bancorp
Inc.  under the  Securities  Act of 1933 of our audit report  dated  January 22,
1999,  with respect to the  consolidated  balance sheets of NBT Bancorp Inc. and
subsidiary  as of  December  31,  1998 and 1997,  and the  related  consolidated
statements of income,  stockholders' equity, cash flows and comprehensive income
for each of the years in the  three-year  period  ended  December 31, 1998 which
report  appears  in the  December  31,  1998  annual  report on Form 10-K of NBT
Bancorp Inc., incorporated by reference herein, and to the reference to our firm
under the heading "Experts" in the Prospectus.


/s/ KPMG LLP
KPMG LLP

Syracuse, New York
February 22, 2000




                                  EXHIBIT 23.2

                         CONSENT OF INDEPENDENT AUDITORS


The Board of Directors
Pioneer American Holding Company Corp.

         We consent to incorporation by reference in the registration  statement
on Form  S-4 of our  audit  report  dated  January  25,  1999,  relating  to the
consolidated  balance  sheets of Pioneer  American  Holding  Company  Corp.  and
subsidiary  as of  December  31,  1998 and 1997,  and the  related  consolidated
statements of operations,  changes in stockholders'  equity,  and cash flows for
each of the years in the three-year  period ended December 31, 1998 which report
has been  incorporated  by reference  in the December 31, 1998 annual  report on
Form 10-K of Pioneer American  Holding Company Corp.,  incorporated by reference
herein,  and to the  reference  to our firm under the heading  "Experts"  in the
Prospectus.


/s/ KPMG LLP
KPMG LLP
Philadelphia, Pennsylvania
February 21, 2000



                                  EXHIBIT 23.3





                           [To be filed by amendment]




                                  EXHIBIT 23.4

                          CONSENT OF FINANCIAL ADVISOR




                           [To be filed by amendment]



                                  EXHIBIT 23.7

                           CONSENT OF JOSEPH G. NASSER


         The undersigned hereby consents, pursuant to Rule 438 of the Securities
Act of 1933, as amended, to the reference to him in the Joint Proxy Statement/
Prospectus of NBT Bancorp Inc. and Pioneer American Holding Company Corp., which
is part of the Registration Statement on Form S-4 of NBT Bancorp Inc. under the
circumstances described therein.



                                               /s/ Joseph G. Nasser

February 22, 2000





                                  EXHIBIT 23.8

                          CONSENT OF GENE E. GOLDENZIEL


         The undersigned hereby consents, pursuant to Rule 438 of the Securities
Act  of  1933,  as  amended,  to  the  reference  to  him  in  the  Joint  Proxy
Statement/Prospectus  of NBT Bancorp Inc. and Pioneer  American  Holding Company
Corp.,  which is part of the  Registration  Statement on Form S-4 of NBT Bancorp
Inc. under the circumstances described therein.


                                                /s/ Gene E. Goldenziel

February 22, 2000




                                  EXHIBIT 23.9

                          CONSENT OF RICHARD CHOJNOWSKI





       The undersigned hereby consents, pursuant to Rule 438 of the Securities
Act  of  1933,  as  amended,  to  the  reference  to  him  in  the  Joint  Proxy
Statement/Prospectus  of NBT Bancorp Inc. and Pioneer  American  Holding Company
Corp.,  which is part of the  Registration  Statement on Form S-4 of NBT Bancorp
Inc. under the circumstances described therein.


                                                /s/ Richard Chojnowski

February 22, 2000




© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission