SEACOAST BANKING CORP OF FLORIDA
S-4, 1997-03-28
STATE COMMERCIAL BANKS
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<PAGE>   1
 
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 28, 1997
    
 
                                                     REGISTRATION NO. 333-
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ---------------------
 
                                    FORM S-4
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933
                             ---------------------
 
                    SEACOAST BANKING CORPORATION OF FLORIDA
             (Exact Name of Registrant as Specified in its Charter)
 
<TABLE>
<S>                             <C>                             <C>
            FLORIDA                          6711                         59-2260678
(State or Other Jurisdiction of  (Primary Standard Industrial          (I.R.S. Employer
Incorporation or Organization)    Classification Code Number)         Identification No.)
</TABLE>
 
                              815 COLORADO AVENUE
                             STUART, FLORIDA 34994
                                 (561) 287-4000
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)
 
                             DENNIS S. HUDSON, III
              EXECUTIVE VICE PRESIDENT AND CHIEF OPERATING OFFICER
                    SEACOAST BANKING CORPORATION OF FLORIDA
                              815 COLORADO AVENUE
                             STUART, FLORIDA 34994
                                 (561) 287-4000
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                             ---------------------
                                WITH COPIES TO:
 
   
<TABLE>
<C>                                            <C>
           RALPH F. MACDONALD, III                          MICHAEL V. MITRIONE
              ALSTON & BIRD LLP                GUNSTER, YOAKLEY, VALDES-FAULI & STEWART, P.A.
             ONE ATLANTIC CENTER                          777 SOUTH FLAGLER DRIVE
          1201 WEST PEACHTREE STREET                           SUITE 500 EAST
         ATLANTA, GEORGIA 30309-3424                WEST PALM BEACH, FLORIDA 33401-6194
                (404) 881-7000                                 (561) 655-1980
</TABLE>
    
 
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE OF SECURITIES TO THE
PUBLIC:  As soon as practicable after the merger (the "Merger") described in
this Registration Statement becomes effective.
 
     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.  [ ]
 
                        CALCULATION OF REGISTRATION FEE
 
   
<TABLE>
<CAPTION>
===================================================================================================================
                                                           PROPOSED             PROPOSED
                                       AMOUNT              MAXIMUM              MAXIMUM             AMOUNT OF
     TITLE OF EACH CLASS               TO BE            OFFERING PRICE         AGGREGATE           REGISTRATION
OF SECURITIES TO BE REGISTERED       REGISTERED          PER SHARE(2)      OFFERING PRICE(2)          FEE(2)
- ------------------------------------------------------------------------------------------------------------------
<S>                             <C>                  <C>                  <C>                  <C>
Class A Common Stock $.10 par
  value.......................     900,000 shares           $11.36            $10,226,700           $3,099.00
==================================================================================================================
</TABLE>
    
 
(1) This Registration Statement covers (i) the maximum number of shares of the
    common stock of the Registrant which is expected to be issued in connection
    with the Merger, and (ii) the maximum number of shares of common stock
    reserved for issuance under various option and other plans of Port St. Lucie
    National Bank Holding Corp. ("PSHC"), the obligations under which will be
    assumed by the Registrant upon consummation of the Merger but which may be
    issued prior to consummation of the Merger.
(2) Pursuant to Rule 457(f)(2), the Registration fee was computed on the basis
    of the aggregate book value of the PSHC Common Stock and PSHC Warrants to be
    exchanged in the Merger.
 
                             --------------------------
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE TIME 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 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SECTION 8(A), SHALL
DETERMINE.
================================================================================
<PAGE>   2
 
                    SEACOAST BANKING CORPORATION OF FLORIDA
 
                             CROSS-REFERENCE SHEET
 
<TABLE>
<CAPTION>
FORM S-4 ITEM                                      CAPTION OR LOCATION IN JOINT PROXY STATEMENT
- -------------                                      --------------------------------------------
<C>   <S>                                          <C>
 1.   Forepart of registration statement and
        outside front cover page of prospectus...  Outside Front Cover of Joint Proxy
                                                   Statement; Facing Page of Registration
                                                     Statement; Cross-Reference Sheet
 2.   Inside front and outside back cover of
        prospectus...............................  Available Information; Documents
                                                   Incorporated by Reference; Table of Contents
 3.   Risk factors, ratio of earnings to fixed
        charges and other information............  Not applicable

 4.   Terms of the transaction...................  Summary; Description of the Merger; Effect
                                                   of the Merger on Rights of Shareholders;
                                                     Description of Seacoast Common Stock
 5.   Pro forma financial information............  Summary; Pro Forma Financial Information

 6.   Material contracts with the company being
        acquired.................................  Summary; Description of the Merger

 7.   Additional information required for
        re-offering by persons and parties deemed
        to be underwriters.......................  Not applicable
 8.   Interest of named experts and counsel......  Opinions

 9.   Disclosure of Commission position on
        indemnification for Securities Act
        liabilities..............................  Not applicable (See Part II, Item 20)

10.   Information with respect to S-3
        registrants..............................  Available Information; Documents
                                                   Incorporated by Summary; Business of
                                                     Seacoast
11.   Incorporation of certain information by
        reference................................  Documents Incorporated by Reference

12.   Information with respect to S-2 or S-3
        registrants..............................  Available Information; Documents
                                                   Incorporated by Reference; Summary; Business
                                                     of PSHC
13.   Incorporation of certain information by
        reference................................  Not Applicable

14.   Information with respect to registrants
        other than S-2 or S-3 registrants........  Not Applicable

15.   Information with respect to S-3
        companies................................  Not Applicable

16.   Information with respect to S-2 or S-3
        companies................................  Available Information; Documents
                                                   Incorporated by Reference; Summary; Business
                                                     of Seacoast
17.   Information with respect to companies other
        than S-2 or S-3 companies................  Not Applicable

18.   Information if proxies, consents, or
        authorizations are to be solicited.......  Documents Incorporated by Reference;
                                                     Summary; Meetings of Shareholders;
                                                     Description of the Merger; Description of
                                                     Seacoast Common Stock
19.   Information if proxies, consents, or
        authorizations are not to be solicited or
        in an exchange offer.....................  Not Applicable
</TABLE>
<PAGE>   3
 
                              [LETTERHEAD OF PSHC]
 
                                                                          , 1997
 
To the Shareholders of
Port St. Lucie National Bank Holding Corp.:
 
     You are cordially invited to attend a Special Meeting of Shareholders (the
"Special Meeting") of Port St. Lucie National Bank Holding Corp. ("PSHC") to be
held at           ,           , Port St. Lucie, Florida, on May   , 1997, at
       .M., local time, notice of which is enclosed. There will also be a
reception beginning at        .M. at           .
 
     At the Special Meeting, you will be asked to consider and vote on a
proposal to approve an Agreement and Plan of Merger (the "Merger Agreement") by
and between PSHC and Seacoast Banking Corporation of Florida ("Seacoast")
pursuant to which PSHC will merge (the "Merger") with and into Seacoast. Upon
consummation of the Merger, each share of PSHC common stock issued and
outstanding (except for certain shares held by PSHC or Seacoast and shares held
by PSHC shareholders who perfect their dissenters' rights) and each issued and
outstanding PSHC stock warrant will be exchanged for a number of shares of
Seacoast Class A common stock determined by formulae that are based upon the
market price of Seacoast Class A common stock during a specified pricing period
prior to closing, all as more fully described in the accompanying Joint Proxy
Statement/Prospectus. Assuming that the $          closing price of Seacoast
Class A common stock on             , 1997 is the closing price used in the
exchange ratio determination, then each share of PSHC common stock outstanding
at the Effective Time of the Merger will be exchanged for .          shares of
Seacoast Class A common stock and each PSHC warrant outstanding at the Effective
Time of the Merger will be exchanged for .          shares of Seacoast Class A
common stock, with cash being paid in lieu of issuing fractional shares. In
addition, Seacoast will assume all outstanding options to purchase shares of
PSHC common stock. The consideration to be received by holders of PSHC common
stock and PSHC warrants is subject to possible adjustment in certain
circumstances relating to certain categories of PSHC loans as described in the
accompanying Joint Proxy Statement/Prospectus.
 
     The accompanying Joint Proxy Statement/Prospectus includes a description of
the proposed Merger and provides other specific information concerning the
Special Meeting. Also enclosed is the PSHC Annual Report on Form 10-KSB for the
year ended December 31, 1996. Please read these materials carefully and consider
thoughtfully the information set forth in them.
 
     The Merger has been approved unanimously by your Board of Directors which
recommends approval by you. Your Board believes that, among other benefits, the
Merger will result in a locally managed and controlled company with greater
financial strength and increased opportunity and flexibility for profitable
expansion and diversification, as well as expanded services and convenience to
our customers. Consummation of the Merger is subject to various conditions,
including approval of the Merger Agreement and the transactions contemplated
therein by PSHC and Seacoast shareholders, and approval of the Merger by the
applicable regulatory agencies.
 
     Approval of the Merger Agreement will require the affirmative vote of a
majority of the issued and outstanding shares of PSHC common stock. ACCORDINGLY,
WHETHER OR NOT YOU PLAN TO ATTEND THE SPECIAL MEETING, YOU ARE URGED TO
COMPLETE, SIGN, AND RETURN PROMPTLY THE ENCLOSED PROXY CARD. IF YOU ATTEND THE
SPECIAL MEETING, YOU MAY VOTE IN PERSON IF YOU WISH, EVEN IF YOU PREVIOUSLY HAVE
RETURNED YOUR PROXY CARD. The proposed Merger with Seacoast is a significant
step for PSHC and your vote on this matter is of great importance.
<PAGE>   4
 
     ON BEHALF OF THE BOARD OF DIRECTORS, I URGE YOU TO VOTE FOR APPROVAL OF THE
MERGER AGREEMENT AND THE TRANSACTIONS CONTEMPLATED THEREIN BY MARKING THE
ENCLOSED PROXY CARD "FOR" ITEM ONE.
 
     We look forward to seeing you at the Special Meeting.
 
                                          Sincerely,
 
                                                /s/ J. HAL ROBERTS, JR.
                                          --------------------------------------
                                                   J. Hal Roberts, Jr.
                                          President and Chief Executive Officer
 
                                        2
<PAGE>   5
 
                            [LETTERHEAD OF SEACOAST]
 
                                                                          , 1997
 
To the Shareholders of
Seacoast Banking Corporation of Florida:
 
     You are cordially invited to attend the Annual Meeting of the Shareholders
(the "Annual Meeting") of Seacoast Banking Corporation of Florida ("Seacoast")
to be held at the Indian River Plantation Beach Resort, Hutchinson Island, 555
N.E. Ocean Boulevard, Stuart, Florida, on             ,             , 1997, at
3:00 P.M., Local Time, notice of which is enclosed.
 
     At the Annual Meeting, you will be asked to consider and vote on proposals
to approve the Agreement and Plan of Merger (the "Merger Agreement") by and
between Seacoast and Port St. Lucie National Bank Holding Corp. ("PSHC") and the
transactions contemplated therein, including the merger (the "Merger") of PSHC
with and into Seacoast and the issuance of shares of Seacoast Class A common
stock to holders of PSHC common stock and stock warrants. Upon consummation of
the Merger, each share of PSHC common stock issued and outstanding (except for
certain shares held by Seacoast or PSHC and shares held by PSHC shareholders who
perfect their dissenters' rights) and each issued and outstanding PSHC stock
warrant will be exchanged for a number of shares of Seacoast Class A common
stock determined by formulae that are based upon the market price of Seacoast
Class A common stock during a specified pricing period prior to closing, all as
more fully described in the accompanying Joint Proxy Statement/Prospectus.
Assuming that the $          closing price of Seacoast Class A common stock on
            , 1997 is the closing price used in the exchange ratio
determination, then each share of PSHC common stock outstanding at the Effective
Time of the Merger will be exchanged for .     shares of Seacoast Class A common
stock and each PSHC warrant outstanding at the Effective Time of the Merger will
be exchanged for .     shares of Seacoast Class A common stock, with cash being
paid in lieu of issuing fractional shares. In addition, Seacoast will assume all
outstanding options to purchase shares of PSHC common stock. The consideration
to be received by holders of PSHC common stock and PSHC warrants is subject to
possible adjustment in certain circumstances relating to certain categories of
PSHC loans as described in the accompanying Joint Proxy Statement/Prospectus.
 
     In addition, you will be asked at the Annual Meeting to consider and vote
upon (i) the reelection of eight directors to serve until the Annual Meeting of
Shareholders in 1998 and until their successors have been elected and qualified,
(ii) certain amendments to Seacoast's Articles of Incorporation, (iii) the
ratification of the appointment of Arthur Andersen LLP as independent auditors
for Seacoast for the fiscal year ending December 31, 1997 and (iv) such other
business as may properly come before the Annual Meeting.
 
     Enclosed are the Notice of Meeting, Joint Proxy Statement/Prospectus and
Proxy, 1996 Annual Report to Shareholders. The Joint Proxy Statement/Prospectus
includes a description of the proposed Merger and election of directors and
provides other specific information concerning the Annual Meeting. Please read
these materials carefully and consider thoughtfully the information set forth in
them.
 
     The Merger has been approved unanimously by your Board of Directors, which
recommends its approval by you. Your Board believes that, among other benefits,
the Merger will result in a company with greater financial strength and
increased opportunity and flexibility for profitable expansion and
diversification. Consummation of the Merger is subject to various conditions,
including approval of the Merger Agreement and the transactions contemplated
therein by Seacoast and PSHC shareholders, and approval of the Merger by the
applicable regulatory agencies.
<PAGE>   6
 
     The combination with PSHC is a natural extension of Seacoast's banking
operations into the attractive Port St. Lucie market. Like Seacoast, PSHC has
built its franchise on community banking, local relationships, and sound lending
principles. Seacoast's management believes that the addition of PSHC's three
branches to the Seacoast banking system can only enhance Seacoast's strategy and
service in its market area.
 
     Approval of the Merger Agreement and the Amendment to the Articles of
Incorporation will require the affirmative vote of (i) the holders of at least
two-thirds of all of the shares of Class A common stock outstanding and entitled
to vote on the Merger proposal at the Annual Meeting voting as a separate class
and (ii) the holders of shares with at least two-thirds of all votes entitled to
be cast by all shares of Seacoast common stock (Class A and Class B) outstanding
and entitled to vote on the Merger proposal at the Annual Meeting, voting
together as a single class. ACCORDINGLY, WHETHER OR NOT YOU PLAN TO ATTEND THE
ANNUAL MEETING, YOU ARE URGED TO COMPLETE, SIGN, AND RETURN PROMPTLY THE
ENCLOSED PROXY CARD. If you attend the Annual Meeting, you may vote in person if
you wish, even if you previously have returned your proxy card. The proposed
Merger with PSHC is a significant step for Seacoast and your vote on this matter
is of great importance.
 
     ON BEHALF OF THE BOARD OF DIRECTORS, I URGE YOU TO VOTE FOR APPROVAL OF THE
MERGER AGREEMENT AND THE TRANSACTIONS CONTEMPLATED THEREIN, INCLUDING THE
ISSUANCE OF SHARES, BY MARKING THE ENCLOSED PROXY CARD "FOR" ITEM ONE, FOR
REELECTION OF ALL EIGHT NOMINEES FOR DIRECTOR NAMED ON THE ENCLOSED FORM OF
PROXY, FOR THE AMENDMENTS TO OUR ARTICLES OF INCORPORATION, AND FOR THE
RATIFICATION OF ARTHUR ANDERSEN LLP AS OUR INDEPENDENT AUDITORS.
 
     We want to thank you for your support this past year. We are proud of our
progress as reflected in the results for 1996, and we encourage you to review
carefully our Annual Report. The acquisition of PSHC is an important transaction
for Seacoast that will help Seacoast continue to be successful in 1997 and
future years. If you have any questions about the Merger or the enclosed
materials please write or call us. We look forward to seeing you at the Annual
Meeting.
 
                                          Sincerely,
 
                                               /s/ DENNIS S. HUDSON, III
                                          --------------------------------------
                                                  Dennis S. Hudson, III
                                                        Secretary
 
                                        2
<PAGE>   7
 
                   PORT ST. LUCIE NATIONAL BANK HOLDING CORP.
                       1100 S.W. ST. LUCIE WEST BOULEVARD
                         PORT ST. LUCIE, FLORIDA 34986
                             ---------------------
 
                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
 
                        TO BE HELD                , 1997
                             ---------------------
 
     NOTICE IS HEREBY GIVEN that a Special Meeting of Shareholders (the "Special
Meeting") of Port St. Lucie National Bank Holding Corp. ("PSHC") will be held at
            ,             , Port St. Lucie, Florida, on                    ,
1997, at          .M., local time, for the following purposes:
 
          1. Merger.  To consider and vote upon a proposal to approve an
     Agreement and Plan of Merger, dated as of February 19, 1997 (the "Merger
     Agreement"), by and between PSHC and Seacoast Banking Corporation of
     Florida, a Florida corporation ("Seacoast"), pursuant to which, among other
     matters, PSHC will merge (the "Merger") with and into Seacoast. Each share
     of PSHC common stock and each PSHC warrant issued and outstanding at the
     effective time of the Merger will be converted into the right to receive
     shares of Seacoast Class A common stock, subject to possible adjustment in
     certain circumstances, all as more fully described in the accompanying
     Joint Proxy Statement/Prospectus. A copy of the Merger Agreement is
     reproduced as Appendix I to the accompanying Joint Proxy Statement/
     Prospectus.
 
          2. Other Business.  To transact such other business as may come
     properly before the Annual Meeting.
 
     Only shareholders of record at the close of business on             , 1997,
will be entitled to receive notice of and to vote at the Special Meeting or any
adjournment or postponement thereof. Approval of the Merger Agreement and the
transactions contemplated therein requires the affirmative vote of a majority of
the issued and outstanding shares of PSHC common stock.
 
     THE BOARD OF DIRECTORS OF PSHC UNANIMOUSLY RECOMMENDS THAT SHAREHOLDERS
VOTE FOR APPROVAL OF THE MERGER AGREEMENT.
 
                                          By Order of the Board Of Directors
 
                                          J. Hal Roberts, Jr.
                                          President and Chief Executive Officer
 
Port St. Lucie, Florida
               , 1997
 
 WHETHER OR NOT YOU PLAN TO ATTEND THE SPECIAL MEETING, PLEASE COMPLETE, DATE,
   AND SIGN THE ENCLOSED FORM OF PROXY AND RETURN IT PROMPTLY IN THE ENCLOSED
    POSTAGE PAID RETURN ENVELOPE IN ORDER TO ENSURE THAT YOUR SHARES WILL BE
                      REPRESENTED AT THE SPECIAL MEETING.
                             ---------------------
 
               PROXIES ARE SOLICITED BY PSHC'S BOARD OF DIRECTORS
                      AND MAY BE REVOKED PRIOR TO EXERCISE
                             ---------------------
 
     EACH SHAREHOLDER HAS THE RIGHT TO DISSENT FROM THE MERGER AGREEMENT AND
DEMAND PAYMENT OF THE FAIR VALUE OF HIS SHARES IF THE MERGER IS CONSUMMATED. THE
RIGHT OF ANY SHAREHOLDER TO RECEIVE SUCH PAYMENT IS CONTINGENT UPON STRICT
COMPLIANCE WITH THE REQUIREMENTS OF SECTION 607.1320 OF THE FLORIDA BUSINESS
CORPORATION ACT. THE FULL TEXT OF SECTION 607.1320 AND SECTIONS 607.1301 AND
607.1302 SETTING FORTH THE RIGHT TO DISSENT IS SET FORTH IN APPENDIX IV TO THE
JOINT PROXY STATEMENT/PROSPECTUS. A SUMMARY OF THE REQUIREMENTS OF SECTION
607.1320 APPEARS IN "DESCRIPTION OF THE MERGER -- DISSENTERS' RIGHTS" IN THE
ACCOMPANYING JOINT PROXY STATEMENT/PROSPECTUS, WHICH IS QUALIFIED IN ITS
ENTIRETY BY THE STATUTORY PROVISIONS INCLUDED IN APPENDIX IV.
<PAGE>   8
 
                    SEACOAST BANKING CORPORATION OF FLORIDA
                              815 COLORADO AVENUE
                             STUART, FLORIDA 34994
 
                             ---------------------
 
                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS
 
                         TO BE HELD             , 1997
 
                             ---------------------
 
     NOTICE IS HEREBY GIVEN that the Annual Meeting of Shareholders (the "Annual
Meeting") of Seacoast Banking Corporation of Florida ("Seacoast") will be held
at the Indian River Plantation Beach Resort, Hutchinson Island, 555 N.E. Ocean
Boulevard, Stuart, Florida, on        ,             , 1997, at 3:00 P.M., Local
Time, for the following purposes:
 
          1. Merger.  To consider and vote upon a proposal to approve an
     Agreement and Plan of Merger, dated as of February 19, 1997 (the "Merger
     Agreement"), by and between Port St. Lucie National Bank Holding Company
     ("PSHC") and Seacoast, pursuant to which, among other matters, PSHC will
     merge (the "Merger") with and into Seacoast and Seacoast shall issue up to
     900,000 shares of Seacoast Class A common stock. Each share of PSHC common
     stock and each PSHC warrant issued and outstanding at the effective time of
     the Merger will be converted into the right to receive shares of Seacoast
     Class A common stock, subject to possible adjustment in certain
     circumstances, all as more fully described in the accompanying Joint Proxy
     Statement/Prospectus. A copy of the Merger Agreement is reproduced as
     Appendix I to the accompanying Joint Proxy Statement/Prospectus.
 
          2. Elect Directors.  To consider and vote upon the reelection of eight
     directors to serve until the Annual Meeting of Shareholders in 1998 and
     until their successors have been elected and qualified.
 
          3. Amendment of Articles of Incorporation.  To consider and vote upon
     a proposal to approve a proposed amendment to Seacoast's Articles of
     Incorporation to clarify the voting requirements in connection with certain
     business combinations.
 
          4. Ratify Auditors.  To ratify the appointment of Arthur Andersen LLP
     as independent auditors for Seacoast for the fiscal year ending December
     31, 1997.
 
          5. Other Business.  To transact such other business as may come
     properly before the Annual Meeting.
 
     Only shareholders of record at the close of business on             , 1997,
will be entitled to receive notice of and to vote at the Annual Meeting or any
adjournment or postponement thereof. Approval of the Merger Agreement and the
transaction contemplated therein and the amendment to the Articles of
Incorporation will require the affirmative vote of (i) the holders of at least
two-thirds of all of the shares of Seacoast Class A common stock outstanding and
entitled to vote at the Annual Meeting, voting as a separate class, and (ii) the
holders of shares with at least two-thirds of all votes entitled to be cast by
all shares of Seacoast common stock (both Class A and Class B) outstanding and
entitled to vote at the Annual Meeting, voting together as a single class. The
vote required for the reelection of the eight directors is a plurality of the
votes cast by the shares entitled to vote in the election, provided that a
quorum is present. The proposal to ratify Arthur Andersen LLP as independent
auditors will be approved if the votes cast by the holders of the shares of
Seacoast common stock present, or represented, at the Annual Meeting and
entitled to vote on the matter favoring this proposal exceed the votes cast in
opposition to the proposal.
<PAGE>   9
 
     THE BOARD OF DIRECTORS OF SEACOAST UNANIMOUSLY RECOMMENDS THAT SHAREHOLDERS
VOTE FOR APPROVAL OF THE MERGER AGREEMENT AND THE TRANSACTIONS CONTEMPLATED
THEREIN, INCLUDING THE ISSUANCE OF SHARES OF SEACOAST CLASS A COMMON STOCK TO
PSHC SHAREHOLDERS AND HOLDERS OF PSHC WARRANTS, FOR THE REELECTION OF ALL EIGHT
NOMINEES FOR DIRECTOR NAMED ON THE ENCLOSED FORM OF PROXY, FOR THE APPROVAL OF
THE AMENDMENTS TO SEACOAST'S ARTICLES OF INCORPORATION AND FOR THE RATIFICATION
OF THE APPOINTMENT OF ARTHUR ANDERSEN LLP AS INDEPENDENT AUDITORS.
 
                                          By Order of the Board of Directors
 
                                               /s/ DENNIS S. HUDSON, III
                                          --------------------------------------
                                                  Dennis S. Hudson, III
                                                   Corporate Secretary
 
Stuart, Florida
                 , 1997
 
WHETHER OR NOT YOU PLAN TO ATTEND THE ANNUAL MEETING, PLEASE COMPLETE, DATE, AND
 SIGN THE ENCLOSED FORM OF PROXY AND RETURN IT PROMPTLY IN THE ENCLOSED POSTAGE
PAID RETURN ENVELOPE IN ORDER TO ENSURE THAT YOUR SHARES WILL BE REPRESENTED AT
                              THE ANNUAL MEETING.
 
                  PROXIES ARE BEING SOLICITED BY THE BOARD OF
                DIRECTORS AND MAY BE REVOKED PRIOR TO EXERCISE.
 
                                        2
<PAGE>   10
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
 
                SUBJECT TO COMPLETION, DATED             , 1997
 
PROSPECTUS
 
                    SEACOAST BANKING CORPORATION OF FLORIDA
 
                     CLASS A COMMON STOCK, $0.10 PAR VALUE
                             ---------------------
                             JOINT PROXY STATEMENT
 
<TABLE>
<C>                                             <C>
        SEACOAST BANKING CORPORATION                    PORT ST. LUCIE NATIONAL BANK
                 OF FLORIDA                                    HOLDING CORP.
            815 COLORADO AVENUE                      1100 S.W. ST. LUCIE WEST BOULEVARD
           STUART, FLORIDA 34994                       PORT ST. LUCIE, FLORIDA 34986
</TABLE>
 
     This Prospectus of Seacoast Banking Corporation of Florida, a bank holding
company organized and existing under the laws of the State of Florida
("Seacoast"), relates to up to 900,000 shares of Class A common stock, par value
$0.10 per share ("Seacoast Class A Stock"), including shares subject to assumed
employee stock options, which are issuable to the shareholders of Port St. Lucie
National Bank Holding Corp., a bank holding company organized and existing under
the laws of the state of Florida ("PSHC"), upon consummation of the proposed
merger (the "Merger") wherein PSHC will merge with and into Seacoast, pursuant
to the terms of the Agreement and Plan of Merger, dated as of February 19, 1997
(the "Merger Agreement"), by and between Seacoast and PSHC.
 
     At the effective time of the Merger (the "Effective Time"), except as
described herein, each issued and outstanding share of common stock, par value
$.01 per share, of PSHC ("PSHC Common Stock") and each issued and outstanding
warrant to purchase shares of PSHC Common Stock ("PSHC Warrants") will be
converted into and exchanged for that number of shares of Seacoast Class A Stock
determined in accordance with the formulae described herein which are dependent
on the market price of Seacoast Class A Stock during a pricing period prior to
the Effective Time. Holders of PSHC Common Stock who intend to dissent will lose
their dissenters' rights of appraisal if they vote for the Merger.
 
     This Prospectus also serves as a Joint Proxy Statement of PSHC and
Seacoast, and is being furnished to the shareholders of PSHC and Seacoast in
connection with the solicitation of proxies by the Board of Directors of PSHC
for use at its special meeting of shareholders (including any adjournment or
postponement thereof, the "PSHC Special Meeting"), and by the Board of Directors
of Seacoast for use at its annual meeting of shareholders (including any
adjournment or postponement thereof, the "Seacoast Annual Meeting"), each to be
held on             , 1997, to consider and vote upon the Merger Agreement and
the transactions contemplated therein (collectively, the "Meetings"), and in the
case of Seacoast, on the reelection of eight directors, certain amendments to
Seacoast's Articles of Incorporation and the ratification of the appointment of
independent auditors. This Joint Proxy Statement/Prospectus ("Joint Proxy
Statement") is being mailed to shareholders of PSHC and Seacoast on or about
            , 1997.
 
   THE SECURITIES OFFERED HEREBY ARE NOT DEPOSITS, SAVINGS ACCOUNTS, OR OTHER
   OBLIGATIONS OF A DEPOSITORY INSTITUTION AND ARE NOT INSURED BY THE FEDERAL
       DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENTAL AGENCY OR
                                INSTRUMENTALITY.
                             ---------------------
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
  ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
JOINT PROXY STATEMENT. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
         The date of this Joint Proxy Statement is             , 1997.
<PAGE>   11
 
                             AVAILABLE INFORMATION
 
     Seacoast and PSHC are subject to the reporting requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and, in
accordance therewith, are required to file reports, proxy statements, and other
information with the Securities and Exchange Commission (the "SEC"). Copies of
such reports, proxy statements, and other information can be obtained, at
prescribed rates, from the SEC by addressing written requests for such copies to
the Public Reference Section at the SEC at 450 Fifth Street, N.W., Judiciary
Plaza, Washington, D.C. 20549. In addition, such reports, proxy statements, and
other information can be inspected at the public reference facilities referred
to above and at the regional offices of the SEC at 7 World Trade Center, 13th
Floor, New York, New York 10048 and Northwestern Atrium Center, 500 West Madison
Street, Suite 1400, Chicago, Illinois 60661. The SEC also maintains a Web site
that contains reports, proxy and information statements and other information
regarding registrants such as Seacoast and PSHC that file electronically with
the SEC. The address of such Web site is http://www.sec.gov.
 
     This Joint Proxy Statement constitutes part of the Registration Statement
on Form S-4 of Seacoast (including any exhibits and amendments thereto, the
"Registration Statement") filed with the SEC under the Securities Act of 1933,
as amended (the "Securities Act"), relating to the securities offered hereby.
This Joint Proxy Statement does not include all of the information in the
Registration Statement, certain portions of which have been omitted pursuant to
the rules and regulations of the SEC. For further information about Seacoast and
the securities offered hereby, reference is made to the Registration Statement.
The Registration Statement may be inspected and copied, at prescribed rates, at
the SEC's public reference facilities at the addresses set forth above. In
addition, Seacoast Common Stock is traded on the Nasdaq National Market System.
Reports, proxy statements, and other information concerning Seacoast may be
inspected at the offices of the National Association of Securities Dealers,
Inc., 1735 K Street, N.W., Washington, D.C. 20006.
 
     Certain financial and other information relating to Seacoast and PSHC is
contained in the documents indicated below under "DOCUMENTS INCORPORATED BY
REFERENCE."
 
     All information contained in this Joint Proxy Statement or incorporated
herein by reference with respect to Seacoast was supplied by Seacoast, and all
information contained in this Joint Proxy Statement or incorporated herein by
reference with respect to PSHC was supplied by PSHC. Although neither Seacoast
nor PSHC has actual knowledge that would indicate that any statements or
information (including financial statements) relating to the other party
contained or incorporated herein are inaccurate or incomplete, neither Seacoast
nor PSHC warrants the accuracy or completeness of such statements or information
as they relate to the other party.
 
     NO PERSON IS AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATION NOT CONTAINED OR INCORPORATED BY REFERENCE IN THIS JOINT PROXY
STATEMENT, AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION SHOULD NOT
BE RELIED UPON AS HAVING BEEN AUTHORIZED. THIS JOINT PROXY STATEMENT DOES NOT
CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO PURCHASE, THE
SECURITIES OFFERED BY THIS JOINT PROXY STATEMENT IN ANY JURISDICTION TO OR FROM
ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH AN OFFER OR SOLICITATION IN SUCH
JURISDICTION. NEITHER THE DELIVERY OF THIS JOINT PROXY STATEMENT NOR ANY
DISTRIBUTION OF THE SECURITIES BEING OFFERED PURSUANT TO THIS JOINT PROXY
STATEMENT SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN IMPLICATION THAT THERE HAS
BEEN NO CHANGE IN THE AFFAIRS OF SEACOAST OR PSHC OR THE INFORMATION SET FORTH
HEREIN SINCE THE DATE OF THIS JOINT PROXY STATEMENT.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
     The following documents previously filed with the SEC by Seacoast pursuant
to the Exchange Act are hereby incorporated by reference herein:
 
          (a) Seacoast's Annual Report on Form 10-K for the fiscal year ended
     December 31, 1996;
 
          (b) Seacoast's Current Reports on Form 8-K and 8-KA dated February 19
     and February 20, 1997; and
 
                                       ii
<PAGE>   12
 
          (c) The description of Seacoast Class A Common Stock contained in
     Seacoast's Registration Statement filed under Section 12 of the Exchange
     Act including all amendments or reports filed for the purpose of updating
     such description.
 
     The following documents previously filed with the SEC by PSHC pursuant to
the Exchange Act are hereby incorporated by reference herein:
 
          (a) PSHC's Annual Report on Form 10-KSB for the fiscal year ended
     December 31, 1996; and
 
          (b) PSHC's Current Report on Form 8-K dated February 19, 1997.
 
     Any statement contained in a document incorporated by reference herein
shall be deemed to be modified or superseded for purposes hereof to the extent
that a statement contained herein modifies or supersedes such statement. Any
such statement so modified or superseded shall not be deemed to constitute a
part hereof, except as so modified or superseded.
 
     THIS PROSPECTUS INCORPORATES DOCUMENTS BY REFERENCE WHICH ARE NOT PRESENTED
HEREIN OR DELIVERED HEREWITH. THE DOCUMENTS ARE AVAILABLE UPON REQUEST FROM
WILLIAM R. HAHL, SEACOAST BANKING CORPORATION OF FLORIDA, 815 COLORADO AVENUE,
STUART, FLORIDA 34994 (TELEPHONE (561) 287-4000). IN ORDER TO ENSURE TIMELY
DELIVERY OF THE DOCUMENTS, ANY REQUEST SHOULD BE MADE BY             , 1997.
 
                                       iii
<PAGE>   13
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Summary.....................................................    1
  The Parties...............................................    1
  Meetings of Shareholders; Record Date; Vote Required......    1
  The Merger................................................    3
  Comparative Per Share Data................................    9
  Other Proposals to be Considered at the Seacoast Annual
     Meeting................................................   10
Selected Financial Data.....................................   11
Selected Condensed Consolidated Pro Forma Financial Data....   13
Meetings of Shareholders....................................   14
  Dates, Places, Times, and Purposes........................   14
  Record Dates, Voting Rights, Required Votes, and
     Revocability of Proxies................................   14
Description of the Merger...................................   17
  General...................................................   17
  Effect of the Merger on PSHC Stock Options................   18
  Background of and Reasons for the Merger..................   18
  Opinion of PSHC's Financial Advisor.......................   22
  Opinion of Seacoast's Financial Advisor...................   24
  Effective Time of the Merger..............................   26
  Distribution of Seacoast Stock Certificates...............   26
  Conditions to Consummation of the Merger..................   27
  Regulatory Approvals......................................   28
  Waiver, Amendment, and Termination........................   29
  Dissenters' Rights........................................   30
  Conduct of Business Pending the Merger....................   31
  Management and Operations After the Merger; Interest of
     Certain Persons in the Merger..........................   33
  Certain Federal Income Tax Consequences...................   35
  Accounting Treatment......................................   37
  Expenses and Fees.........................................   37
  Resales of Seacoast Class A Stock.........................   37
Effect of the Merger on Rights of Shareholders..............   38
  Authorized Capital Stock..................................   38
  Amendment of Articles of Incorporation and Bylaws.........   39
  Classified Board of Directors and Absence of Cumulative
     Voting.................................................   40
  Removal of Directors......................................   40
  Indemnification...........................................   40
  Special Meetings of Shareholders..........................   41
  Actions by Shareholders Without a Meeting.................   41
  Mergers, Consolidations, and Sales of Assets..............   42
  Shareholders' Rights to Examine Books and Records.........   43
  Dividends.................................................   43
Comparative Market Prices and Dividends.....................   44
Business of PSHC............................................   46
  General...................................................   46
Business of Seacoast........................................   46
  General...................................................   46
  Pro Forma Financial Information...........................   47
Election of Directors.......................................   50
  General...................................................   50
  Information About the Board of Directors and Its
     Committees.............................................   54
  Executive Officers........................................   54
</TABLE>
    
 
                                       iv
<PAGE>   14
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
  Management Stock Ownership................................   55
  Compensation of Executive Officers........................   55
  Salary and Benefits Committee Report......................   55
  Grants of Options/SARs in 1996............................   59
  Aggregated Option/SAR Exercises in 1996 and 1996 Year-End
     Option/SAR Values......................................   59
  Profit Sharing Plan.......................................   59
  Performance Graph.........................................   60
  Employment and Severance Agreements.......................   60
Salary and Benefits Committee Interlocks and Insider
  Participation.............................................   61
Certain Transactions and Business Relationships.............   61
Principal Shareholders......................................   62
Amendments to the Seacoast's Articles of Incorporation......   63
Ratification of Appointment of Seacoast Independent
  Auditors..................................................   63
Section 16(a) Beneficial Ownership Reporting Compliance.....   63
Shareholder Proposals for 1998 Annual Meeting...............   64
Other Matters...............................................   64
Other Information...........................................   64
  Proxy Solicitation Costs..................................   64
Experts.....................................................   64
Opinions....................................................   64
Appendices:
  Appendix I     --  Agreement and Plan of Merger dated as of February 19, 1997
                     by and between Seacoast Banking Corporation of Florida and
                     Port St. Lucie National Bank Holding Corp.
  Appendix II    --  Opinion of Austin Associates, Inc.
  Appendix III   --  Opinion of The Robinson-Humphrey Company, Inc.
  Appendix IV    --  Sections of the Florida Business Corporation Act Relating to
                     Dissenters' Appraisal Rights
  Appendix V     --  Revised Article XI of Seacoast Banking Corporation of
                     Florida's Articles of Incorporation
</TABLE>
 
                                        v
<PAGE>   15
 
                                    SUMMARY
 
     The following is a summary of certain information contained in this Joint
Proxy Statement and the documents incorporated herein by reference. This summary
is not intended to be a complete description of the matters covered in this
Joint Proxy Statement and is qualified in its entirety by the more detailed
information appearing elsewhere or incorporated by reference in this Joint Proxy
Statement. Shareholders are urged to read carefully the entire Joint Proxy
Statement, including the Appendices. As used in this Joint Proxy Statement, the
terms "Seacoast" and "PSHC" refer to those entities, respectively, and, where
the context requires, to those entities and their respective subsidiaries.
 
THE PARTIES
 
     PSHC.  PSHC is a bank holding company headquartered in Port St. Lucie,
Florida, with three banking offices in St. Lucie County, Florida. As of December
31, 1996, PSHC had total consolidated assets of approximately $130 million,
total consolidated deposits of approximately $119 million, and total
consolidated shareholders' equity of approximately $10 million. Through its
banking subsidiary, Port St. Lucie National Bank ("PSNB"), and its wholly-owned
subsidiary, Spirit Mortgage Corp., PSHC offers a broad range of banking and
banking-related services.
 
     PSHC was organized under the laws of the state of Florida and commenced
operations in 1989 as a registered bank holding company under the Bank Holding
Company Act of 1956, as amended (the "BHC Act"). PSHC's principal executive
office is located at 1100 S.W. St. Lucie West Boulevard, Port St. Lucie, Florida
34986, and its telephone number at such address is (561) 340-2800.
 
     Additional information with respect to PSHC and its subsidiaries is
included in documents incorporated by reference in this Joint Proxy Statement.
See "AVAILABLE INFORMATION," "DOCUMENTS INCORPORATED BY REFERENCE," and
"BUSINESS OF PSHC."
 
     Seacoast.  Seacoast is a bank holding company headquartered in Stuart,
Florida, with approximately 19 banking offices in Florida. As of December 31,
1996, Seacoast had total consolidated assets of approximately $808 million,
total consolidated deposits of approximately $693 million, and total
consolidated shareholders' equity of approximately $67 million. Through its
banking subsidiary, First National Bank and Trust Company of the Treasure Coast
("FNB"), and other indirect subsidiaries, Seacoast offers a full array of
deposit accounts and retail banking services, engages in consumer and commercial
lending and provides a wide variety of trust and investment brokerage services.
Seacoast's primary service area is the "Treasure Coast", which consists of the
counties of Martin, St. Lucie and Indian River on Florida's southeastern coast.
The Bank operates banking offices in the following locations: five in Stuart,
two in Palm City, one in Jensen Beach, two on Hutchinson Island, one in Hobe
Sound, two in Vero Beach, one in Sebastian, four in Port St. Lucie, and one in
Ft. Pierce.
 
     Seacoast was organized under the laws of the state of Florida and commenced
operations in 1983 as a registered bank holding company under the BHC Act.
Seacoast's principal executive office is located at 815 Colorado Avenue, Stuart,
Florida 34994, and its telephone number at such address is (561) 287-4000.
 
     Additional information with respect to Seacoast and its subsidiaries is
included in documents incorporated by reference in this Joint Proxy Statement.
See "AVAILABLE INFORMATION," "DOCUMENTS INCORPORATED BY REFERENCE," and
"BUSINESS OF SEACOAST."
 
MEETINGS OF SHAREHOLDERS; RECORD DATE; VOTE REQUIRED
 
     PSHC.  This Joint Proxy Statement is being furnished to the holders of PSHC
Common Stock in connection with the solicitation by the PSHC Board of Directors
of proxies for use at the PSHC Special Meeting at which PSHC shareholders will
be asked to vote to approve the Merger Agreement and the transactions
contemplated therein. The PSHC Special Meeting will be held at             ,
            , Port St. Lucie, Florida, on             , 1997, at .M. local time.
See "MEETINGS OF SHAREHOLDERS -- Date, Place, Time, and Purpose."
                                        1
<PAGE>   16
 
     PSHC's Board of Directors has fixed the close of business on             ,
1997, as the record date (the "PSHC Record Date") for determination of the
shareholders entitled to notice of and to vote at the PSHC Special Meeting. Only
holders of record of shares of PSHC Common Stock on the PSHC Record Date will be
entitled to notice of and to vote at the PSHC Special Meeting. Each share of
PSHC Common Stock is entitled to one vote. Shareholders who execute proxies
retain the right to revoke them at any time prior to being voted at the PSHC
Special Meeting. On the PSHC Record Date, there were             shares of PSHC
Common Stock issued and outstanding. See "MEETINGS OF SHAREHOLDERS -- Record
Dates, Voting Rights, Required Votes, and Revocability of Proxies."
 
     Approval of the Merger Agreement and the transactions contemplated therein
requires the affirmative vote by holders of a majority (            shares) of
the shares of PSHC Common Stock entitled to vote at the PSHC Special Meeting. As
of the PSHC Record Date, PSHC's directors beneficially owned
approximately shares, or      %, of the outstanding shares of PSHC Common Stock
entitled to vote at the Special Meeting, and have agreed to vote such shares of
PSHC Common Stock in favor of the Merger. In addition, executive officers of
PSHC who are not PSHC directors beneficially own             shares, or      %
of PSHC Common Stock and are expected to vote such shares in favor of the
Merger. As of the PSHC Record Date, Seacoast and its affiliates held no shares
of PSHC Common Stock. See "MEETINGS OF SHAREHOLDERS -- Record Dates, Voting
Rights, Required Votes, and Revocability of Proxies."
 
     PSHC'S SHAREHOLDERS HAVE THE RIGHT TO DISSENT FROM APPROVAL OF THE MERGER
AGREEMENT AND OBTAIN PAYMENT FOR THE FAIR VALUE OF THEIR SHARES OF PSHC COMMON
STOCK BY STRICTLY FOLLOWING THE PROCEDURES DESCRIBED IN SECTION 607.1301, ET
SEQ. OF THE FLORIDA BUSINESS CORPORATION ACT ("FBCA"). SEE "THE MERGER
DISSENTERS' RIGHTS" AND APPENDIX IV.
 
     Seacoast.  This Joint Proxy Statement is being furnished to the holders of
Seacoast Common Stock in connection with the solicitation by the Seacoast Board
of Directors of proxies for use at the Seacoast Annual Meeting at which Seacoast
shareholders will be asked to vote on, among other matters, a proposal to
approve the Merger Agreement and the transactions contemplated therein,
including the issuance of Seacoast Class A Stock. The Seacoast Annual Meeting
will be held at the Indian River Plantation Beach Resort, Hutchinson Island, 555
N.E. Ocean Boulevard, Stuart, Florida, on             ,             , 1997, at
3:00 P.M., Local Time. See "MEETINGS OF SHAREHOLDERS -- Date, Place, Time, and
Purpose."
 
     Seacoast's Board of Directors has fixed the close of business on
  , 1997, as the record date (the "Seacoast Record Date") for determination of
the shareholders entitled to notice of and to vote at the Seacoast Annual
Meeting. Only holders of record of shares of Seacoast Common Stock on the
Seacoast Record Date will be entitled to notice of and to vote at the Seacoast
Annual Meeting. Shareholders who execute proxies retain the right to revoke them
at any time prior to being voted at the Seacoast Annual Meeting. On the Seacoast
Record Date, there were           shares of Seacoast Class A Stock issued and
outstanding, which were held by approximately           shareholders of record
and        shares of Seacoast $.10 par value Class B Stock ("Class B Stock" and
together with the Seacoast Class A Stock, the "Seacoast Common Stock") issued
and outstanding, which were held by approximately        shareholders of record.
 
     Holders of record of Seacoast Class A Stock are entitled to one vote per
share on each matter to be considered and voted upon at the Seacoast Annual
Meeting. Holders of Class B Stock are entitled to 10 votes per share on each
matter to be considered and voted upon at the Seacoast Annual Meeting.
 
     Seacoast's Articles of Incorporation also provide that, except as otherwise
required by law or by the Articles of Incorporation, holders of shares of
Seacoast Class A Stock and Class B Stock vote together as a single class on all
matters. The Seacoast Articles of Incorporation require that the holders of
Seacoast Class A Stock approve the Merger Agreement and the transactions
contemplated therein as a separate class as well as a single class together with
the Class B Stock. As a result of the ten-to-one voting preference accorded by
the Articles of Incorporation to shares of Class B Stock, as of the Seacoast
Record Date there were           votes entitled to be cast by the holders of the
outstanding Seacoast Common Stock, with the holders of the Class B Stock
entitled to cast           votes or      % of such amount on matters on which
the holders of
                                        2
<PAGE>   17
 
Seacoast Class A Stock and Class B Stock vote together as a single class. See
"MEETINGS OF SHAREHOLDERS -- Record Dates, Voting Rights, Required Votes, and
Revocability of Proxies."
 
     Approval of the Merger Agreement and the transactions contemplated therein
and the amendment to the Articles of Incorporation will require the affirmative
vote of (i) the holders of at least two-thirds (          votes) of all of the
shares of Seacoast Class A Stock outstanding and entitled to vote at the Annual
Meeting, voting as a separate class and (ii) the holders of shares with at least
two-thirds (          votes) of all votes entitled to be cast by all shares of
Seacoast Class A and Class B Common Stock outstanding and entitled to vote at
the Annual Meeting, voting together as a single class. The vote required for the
reelection of the eight directors is a plurality of the votes cast by the shares
of Seacoast Common Stock entitled to vote in the election, provided that a
quorum is present. The proposal to ratify Arthur Andersen LLP as independent
auditors will be approved if the votes cast by the holders of the shares of
Seacoast Common Stock present, or represented, at the Annual Meeting and
entitled to vote on the matter favoring this proposal exceed the votes cast in
opposition to the proposal. As of the Seacoast Record Date, all directors and
executive officers of Seacoast as a group (11 persons) beneficially owned
approximately           shares of Seacoast Class A Stock, constituting      % of
the total number of shares of Seacoast Class A Stock outstanding at that date,
and approximately           shares of Class B Stock, constituting      % of the
total number of shares of Class B Stock outstanding at that date. Seacoast's
directors and executive officers beneficially owned as of that date, shares of
Common Stock having an aggregate of        votes, or      % of the total votes
represented by Seacoast Common Stock outstanding on the Seacoast Record Date,
and are anticipated to vote their shares of Seacoast Common Stock in favor of
the Merger and the other proposals described herein. As of the Seacoast Record
Date, PSHC held no shares of Seacoast Common Stock. See "MEETINGS OF
SHAREHOLDERS -- Record Dates, Voting Rights, Required Votes, and Revocability of
Proxies."
 
THE MERGER
 
     General.  The Merger Agreement provides for the acquisition of PSHC by
Seacoast pursuant to the Merger of PSHC with and into Seacoast. It is
anticipated that immediately subsequent to the consummation of the Merger, PSNB
will be merged with and into FNB. A copy of the Merger Agreement is set forth at
Appendix I to this Joint Proxy Statement.
 
     Consideration and Exchange Ratios.  At the Effective Time, each share of
PSHC Common Stock then issued and outstanding (excluding shares held by PSHC,
Seacoast, or their respective subsidiaries, other than shares held in a
fiduciary capacity or in satisfaction of debts previously contracted, and
excluding shares held by PSHC shareholders who perfect their dissenters' rights)
will be converted into and exchanged for a number of shares of Seacoast Class A
Stock determined by a formula that is based upon the market price of Seacoast
Class A Stock during a specified pricing period prior to closing. Specifically,
each share of PSHC Common Stock as described in the preceding sentence will be
exchanged for that number of shares of Seacoast Class A Stock determined by
dividing (A) (i) the sum of (x) the average of the closing prices on the Nasdaq
National Market of Seacoast Class A Stock for the pricing period (the "Pricing
Period") of 20 trading days preceding the fifth trading day preceding the
Closing Date (the "Seacoast Stock Price") multiplied by 900,000 and (y)
$1,242,953, (ii) divided by the number of shares of PSHC Common Stock plus the
number of shares of PSHC Common Stock subject to PSHC stock options and PSHC
Warrants, outstanding at the Effective Time (the "Purchase Price Per Share"), by
(B) the Seacoast Stock Price (the "Stock Exchange Ratio"). In addition, each
outstanding PSHC Warrant at the Effective Time will be exchanged for that number
of shares of Seacoast Class A Stock determined by dividing (A) the difference
between the Purchase Price Per Share and $8.26 by (B) the Seacoast Stock Price
(the "Warrant Exchange Ratio"). Seacoast will also assume the obligations of
PSHC under various stock plans and programs and adopt substitute plans where
appropriate. The consideration to be received by holders of PSHC Common Stock
and PSHC Warrants is subject to possible adjustment in certain circumstances
relating to certain categories of PSHC loans as described herein. See
"DESCRIPTION OF THE MERGER -- Conduct of Business Pending the Merger
(subparagraph (vi))."
 
     The last sale price per share of Seacoast Class A Stock as reported on the
Nasdaq National Market on February 18, 1997 was $28.75. If the Seacoast Stock
Price (as defined above) were $28.75 at the Effective
                                        3
<PAGE>   18
 
Time, each share of PSHC Common Stock would be converted into .9969 shares of
Seacoast Class A Stock (the "Estimated Stock Exchange Ratio") and each PSHC
Warrant would be converted into .70957 shares of Seacoast Class A Stock (the
"Estimated Warrant Exchange Ratio").
 
     The exact Stock Exchange Ratio and Warrant Exchange Ratio are each
dependent on the closing prices of Seacoast Class A Stock as reported on Nasdaq
National Market during the Pricing Period. The actual market price of a share of
Seacoast Class A Stock at the Effective Time, or on the date on which
certificates representing such shares are received by former holders of PSHC
Common Stock or PSHC Warrants, may be more or less than the actual Seacoast
Stock Price, the last sale price per share of Seacoast Class A Stock on March
10, 1997 (on which the Estimated Stock Exchange Ratio and the Estimated Warrant
Exchange Ratio were determined) or on the date of the PSHC Special Meeting. PSHC
shareholders are urged to obtain information on the trading value of Seacoast
Class A Stock that is more recent than that provided in this Joint Proxy
Statement. See "COMPARATIVE MARKET PRICES AND DIVIDENDS."
 
     No fractional shares of Seacoast Class A Stock will be issued. Rather, cash
(without interest) will be paid in lieu of any fractional share interest to
which any PSHC shareholder or PSHC Warrant holder would be entitled upon
consummation of the Merger, in an amount equal to such fractional part of a
share of Seacoast Class A Stock multiplied by the Seacoast Stock Price. See
"DESCRIPTION OF THE MERGER -- General."
 
     The Merger Agreement also contemplates that at the Effective Time, each
award, option, or other right to purchase or acquire shares of PSHC Common Stock
pursuant to stock options, stock appreciation rights, or stock awards, excluding
the PSHC Warrants ("PSHC Stock Options") granted by PSHC under the PSHC Stock
Plans, as that term is defined in the Merger Agreement, which are outstanding at
the Effective Time, whether or not exercisable, will be converted into and
become rights with respect to Seacoast Class A Stock on a basis adjusted to
reflect the Stock Exchange Ratio. As of the PSHC Record Date the only PSHC
Rights outstanding are           options to purchase PSHC Common Stock.
 
     As of the PSHC Record Date, PSHC had           shares of PSHC Common Stock
issued and outstanding,           shares of PSHC Common Stock subject to PSHC
Warrants and           additional shares of PSHC Common Stock subject to PSHC
Stock Options. Seacoast will issue or reserve for issuance an aggregate of
900,000 shares of Seacoast Class A Stock in the Merger. Based on the number of
PSHC shares of Common Stock, PSHC Warrants, and PSHC Stock Options outstanding
on the PSHC Record Date and the Estimated Stock Exchange Ratio of .9969 and the
Estimated Warrant Exchange Ratio of .70957, it is anticipated that upon
consummation of the Merger, Seacoast would issue approximately           shares
of Seacoast Class A Stock to holders of PSHC Common Stock,           shares of
Seacoast Class A Stock to holders of PSHC Warrants, and reserve for issuance
          shares of Seacoast Class A Stock for future issuance to holders of
PSHC stock options. Accordingly, Seacoast would then have issued and outstanding
approximately           shares of Seacoast Class A Stock based on the number of
shares of Seacoast Class A Stock issued and outstanding on the Seacoast Record
Date.
 
  Reasons for the Merger, Recommendations of the Boards of Directors of PSHC and
Seacoast.
 
     The PSHC Board believes that the Merger is in the best interests of PSHC
and its shareholders and holders of PSHC Warrants, has unanimously approved the
Merger Agreement and unanimously recommends that PSHC shareholders vote "FOR"
approval of the Merger Agreement and the consummation of the transactions
contemplated therein. In deciding to approve the Merger Agreement and the
consummation of the transactions contemplated therein, the PSHC Board considered
a number of factors, including, among other matters, the financial terms of the
proposed Merger, increased liquidity, a comparison of the terms with comparable
transactions, the opinion of its financial advisors, and alternatives to the
Merger See "THE MERGER -- Reasons for the Merger."
 
     The Seacoast Board believes that the Merger is in the best interests of
Seacoast and its shareholders, has unanimously approved the Merger Agreement and
unanimously recommends that Seacoast shareholders vote "FOR" approval of the
Merger Agreement and the consummation of the transactions contemplated therein,
including the issuance of shares of Seacoast Class A Stock to holders of PSHC
Common Stock and PSHC
                                        4
<PAGE>   19
 
Warrants. In deciding to approve the Merger Agreement and the consummation of
the transactions contemplated therein, the Seacoast Board considered a number of
factors, including the financial condition, results of operations and future
prospects of Seacoast and PSHC, PSHC's fit in Seacoast's strategic plan for
expanding in the St. Lucie market and other areas of the Treasure Coast, the
financial advice of The Robinson-Humphrey Company, Inc., the likelihood of the
Merger being approved by regulatory authorities without undue conditions or
delay, legal advice concerning the proposed Merger, and the compatibility of the
operations of Seacoast and PSHC. The Board of Directors of Seacoast also
recommends that shareholders vote "FOR" the reelection of all eight nominees for
directors named on the enclosed form of proxy, "FOR" the approval of the
amendments to Seacoast's Articles of Incorporation and "FOR" the ratification of
the appointment of Arthur Andersen LLP as independent auditors. See "THE
MERGER -- Reasons for the Merger."
 
     The Boards of Directors of PSHC and Seacoast believe that the Merger will
result in a company with expanded opportunities for profitable growth and that
the combined resources and capital of PSHC and Seacoast will provide an enhanced
ability to compete in the changing and competitive financial services industry.
See "DESCRIPTION OF THE MERGER -- Background of and Reasons for the Merger."
 
  Opinions of Financial Advisors.
 
     Austin Associates, Inc. ("Austin Associates") has rendered an opinion to
PSHC that, based on and subject to the procedures, matters, and limitations
described in its opinion and such other matters as it considered relevant, as of
the date of its opinion, the terms of the Merger are fair, from a financial
point of view, to the shareholders and warrant holders of PSHC. The opinion of
Austin Associates is attached as Appendix II to this Joint Proxy Statement. PSHC
shareholders are urged to read the opinion in its entirety for a description of
the procedures followed, matters considered, and limitations on the reviews
undertaken in connection therewith. See "DESCRIPTION OF THE MERGER -- Opinion of
PSHC's Financial Advisor."
 
     The Robinson-Humphrey Company ("Robinson-Humphrey") has rendered an opinion
to Seacoast that, based on and subject to the procedures, matters, and
limitations described in its opinion and such other matters as it considered
relevant, as of the date of its opinion, the terms of the Merger are fair, from
a financial point of view, to the shareholders of Seacoast. The opinion of
Robinson-Humphrey is attached as Appendix III to this Joint Proxy Statement.
Seacoast shareholders are urged to read the opinion in its entirety for a
description of the procedures followed, matters considered, and limitations on
the reviews undertaken in connection therewith. See "DESCRIPTION OF THE
MERGER -- Opinion of Seacoast's Financial Advisor."
 
  Effective Time.
 
     Subject to the conditions to the obligations of the parties to effect the
Merger, the Effective Time will occur on the date and at the time that the
Florida Articles of Merger become effective with the Florida Secretary of State.
Unless otherwise agreed upon by PSHC and Seacoast, and subject to the conditions
to the obligations of the parties to effect the Merger, the parties will use
their reasonable efforts to cause the Effective Time to occur on the first
business day following the last to occur of (i) the effective date (including
the expiration of any applicable waiting period) of the last consent of any
regulatory authority required for the Merger and (ii) the date on which the
shareholders of PSHC and Seacoast approve the matters relating to the Merger
Agreement required to be approved by such shareholders by applicable law. See
"DESCRIPTION OF THE MERGER -- Effective Time of the Merger," "Conditions to
Consummation of the Merger," and "-- Waiver, Amendment, and Termination."
 
     NO ASSURANCE CAN BE PROVIDED THAT THE NECESSARY SHAREHOLDER AND REGULATORY
APPROVALS CAN BE OBTAINED OR THAT THE OTHER CONDITIONS PRECEDENT TO THE MERGER
CAN OR WILL BE SATISFIED. PSHC AND SEACOAST ANTICIPATE THAT ALL CONDITIONS TO
THE CONSUMMATION OF THE MERGER WILL BE SATISFIED SO THAT THE MERGER CAN BE
CONSUMMATED DURING THE FIRST HALF OF 1997. HOWEVER, DELAYS IN THE CONSUMMATION
OF THE MERGER COULD OCCUR.
                                        5
<PAGE>   20
 
  Exchange of Stock Certificates.
 
     Promptly after the Effective Time, Seacoast will cause
                              , acting in its capacity as exchange agent for
Seacoast (the "Exchange Agent"), to mail to each holder of record of a
certificate or certificates (collectively, the "Certificates") which,
immediately prior to the Effective Time, represented outstanding shares of PSHC
Common Stock, and to each holder of record of PSHC Warrants, a letter of
transmittal and instructions for use in effecting the surrender and cancellation
of the Certificates and PSHC Warrants in exchange for certificates representing
shares of Seacoast Class A Stock. Cash will be paid to the holders of PSHC
Common Stock and PSHC Warrants in lieu of the issuance of any fractional shares
of Seacoast Class A Stock.
 
     In no event will the holder of any surrendered Certificate(s) or PSHC
Warrants be entitled to receive interest on any cash to be issued to such
holder, and in no event will PSHC, Seacoast, or the Exchange Agent be liable to
any holder of PSHC Common Stock or PSHC Warrant for any Seacoast Class A Stock
or dividends thereon or cash delivered in good faith to a public official
pursuant to any applicable abandoned property, escheat, or similar law.
 
  Regulatory Approvals And Other Conditions.
 
     The Merger is subject to approval by the Board of Governors of the Federal
Reserve System (the "Federal Reserve"). An application has been filed with the
Federal Reserve for the requisite approvals under the BHC Act. Although Seacoast
and PSHC know of no reason that such approval will not be obtained timely, there
is no assurance that such regulatory approval will be obtained, or as to the
timing or content of any such approval.
 
     Consummation of the Merger is subject to various other conditions,
including among others, receipt of the required approvals of PSHC and Seacoast
shareholders, receipt of an opinion of counsel that the Merger will qualify as a
"tax free" reorganization for federal income tax purposes, receipt of a letter
from the independent accountants of Seacoast that the Merger will qualify for
pooling-of-interests accounting treatment, a minimum PSHC shareholders' equity
amount at Closing, and the absence of any regulatory restrictions that would
materially adversely affect the economic or business benefits contemplated by
Seacoast. See "DESCRIPTION OF THE MERGER -- Conditions to Consummation of the
Merger."
 
  Conduct of Business Pending the Merger.
 
     Each party has agreed in the Merger Agreement, among other things, to take
no action that would adversely affect its ability to perform its covenants and
agreements under the Merger Agreement. PSHC has agreed to operate its business
only in the usual, regular and ordinary course, and in a manner designed to
preserve intact its business organization and assets. Seacoast has also agreed
to continue to conduct its business in a manner designed in its reasonable
judgment, to enhance the long-term value of Seacoast Common Stock and Seacoast
business prospects. In addition, PSHC has agreed not to take certain actions
relating to the operation of PSHC pending consummation of the Merger without the
prior written consent of Seacoast, except as otherwise permitted by the Merger
Agreement, including, among other things: (i) becoming responsible for any
obligation for borrowed money in excess of $50,000, except in the ordinary
course of business consistent with past practices; (ii) paying any dividends,
repurchasing, redeeming or otherwise acquiring or exchanging any shares of its
capital stock, or, subject to certain exceptions, issuing any additional shares
of its capital stock or giving any person the right to acquire any such shares,
or issuing any long-term debt; (iii) acquiring control over any other entity;
(iv) subject to certain exceptions, granting any increase in compensation or
benefits, or paying any bonus, to any of its directors, officers or employees;
(v) modifying or adopting any employee benefit plans, including any employment
contract; (vi) modifying, amending or terminating any material contract, or
(vii) making loans of certain types and in certain designated geographic areas.
See "DESCRIPTION OF THE MERGER -- Conduct of Business Pending the Merger."
                                        6
<PAGE>   21
 
  Waiver, Amendment, And Termination.
 
     The Merger Agreement may be terminated and the Merger abandoned at any time
prior to the Effective Time by mutual action of PSHC and Seacoast, or by either
PSHC or Seacoast under certain circumstances, including if the Merger is not
consummated by August 31, 1997, unless the failure to consummate by such time is
due to a breach of the Merger Agreement by the party seeking to terminate. PSHC
also has a unilateral right to terminate the Merger Agreement if the Purchase
Price Per Share is less than $24.62. See "DESCRIPTION OF THE MERGER -- Waiver,
Amendment, and Termination."
 
  Dissenter's Rights.
 
     Each holder of PSHC Common Stock who perfects his rights is entitled to the
rights and remedies of a dissenting shareholder under Sections 607.1301 through
607.1320 of the FBCA, subject to strict compliance with the procedures set forth
therein. Among other things, a dissenting shareholder who has perfected his
dissenter's rights is entitled to receive an amount in cash equal to the "fair
value" of such holder's shares. A copy of Sections 607.1301 through 607.1320 of
the FBCA is set forth in APPENDIX IV of this Joint Proxy Statement and a summary
thereof is included under "THE MERGER -- Dissenters' Rights." TO PERFECT
DISSENTERS' RIGHTS, A SHAREHOLDER MUST COMPLY WITH SECTION 607.1320 OF THE FBCA
WHICH REQUIRES, AMONG OTHER THINGS, THAT THE SHAREHOLDER GIVE PSHC NOTICE OF
SUCH HOLDER'S INTENTION TO DISSENT FROM THE APPROVAL OF THE MERGER AGREEMENT
PRIOR TO THE VOTE OF THE SHAREHOLDERS OF PSHC AT THE PSHC SPECIAL MEETING AND
THAT SUCH SHAREHOLDER NOT VOTE SUCH HOLDER'S SHARES IN FAVOR OF THE MERGER
AGREEMENT. ANY PSHC SHAREHOLDER WHO RETURNS A SIGNED PROXY BUT FAILS TO PROVIDE
INSTRUCTIONS AS TO THE MANNER IN WHICH SUCH HOLDER'S SHARES ARE TO BE VOTED WILL
BE DEEMED TO HAVE VOTED IN FAVOR OF THE MERGER AGREEMENT AND THUS WILL NOT BE
ENTITLED TO ASSERT DISSENTERS' RIGHTS.
 
  Interests of Certain Persons in the Merger.
 
     Certain members of PSHC's management and its Board of Directors have
interests in the Merger in addition to their interests as shareholders of PSHC
generally. These include, among other things, provisions in the Merger Agreement
relating to indemnification of directors and officers, director and officer
liability insurance, and eligibility for certain Seacoast employee benefits.
Promptly after the Effective Time, Jeffrey S. Furst and Christopher E. Fogal,
current directors of PSHC, will become members of Seacoast's and FNB's Board of
Directors. J. Hal Roberts, Jr., the current Chief Executive Officer of PSHC,
also will become an executive officer of Seacoast and FNB pursuant to an
employment agreement Mr. Roberts has entered into with Seacoast and FNB. The
following members of the PSHC Board of Directors will become members of a newly
created FNB Advisory Board of Directors for St. Lucie County: Charles E. Bigge,
Howard L. Bickford, Ellen J. Guterl, Harold H. Goldman, Raymond L. Isenburg, Joe
Marinaro, and George V. Weston. The Merger Agreement provides that, after the
Effective Time, Seacoast will provide generally to officers and employees of
PSHC and its subsidiaries, employee benefits under employee benefit plans (other
than stock options or other plans involving the potential issuance of Seacoast
Common Stock), on terms and conditions that, when taken as a whole, are
substantially similar to those currently provided by Seacoast and its
subsidiaries to their similarly situated officers and employees. For purposes of
participation, vesting and benefit accrual under such employee benefit plans
(other than benefit accrual in the case of Seacoast's retirement plans), service
with PSHC or its subsidiaries prior to the Effective Time will be treated as
service with Seacoast or its subsidiaries. As of                               ,
1997, the directors and officers of PSHC beneficially owned no shares of
Seacoast Common Stock. See "THE MERGER -- Management and Operations After the
Merger" and "-- Interests of Certain Persons in the Merger."
 
  Certain Federal Income Tax Consequences of the Merger.
 
     Consummation of the Merger is conditioned on the receipt by PSHC and
Seacoast of an opinion of Alston & Bird, counsel to Seacoast, to the effect
that, among other things, the Merger will constitute a reorganization within the
meaning of Section 368(a) of the Internal Revenue Code of 1986, as amended (the
"Code"), and the exchange by a PSHC shareholder of PSHC Common Stock for shares
of Seacoast Class A Stock in the Merger will not result in gain or loss for
federal income tax purposes to such shareholder, except that gain or loss will
be recognized to the extent of cash received in lieu of a fractional share or as
a result of
                                        7
<PAGE>   22
 
the exercise of appraisal rights The tax opinion does not address the tax
consequences of the exchange of PSHC Warrants for Seacoast Class A Stock in the
Merger. Under current law, the tax consequences of the exchange of PSHC Warrants
for Seacoast Class A Stock in the Merger are unclear. Holders of PSHC Warrants
should consult their tax advisors as to the possible tax consequences of such
exchange. For a further discussion of the federal income tax consequences of the
Merger, see "DESCRIPTION OF THE MERGER -- Certain Federal Income Tax
Consequences."
 
     BECAUSE CERTAIN TAX CONSEQUENCES OF THE MERGER MAY VARY DEPENDING UPON THE
PARTICULAR CIRCUMSTANCES OF EACH SHAREHOLDER AND OTHER CIRCUMSTANCES, AND
BECAUSE BASED ON EXISTING BINDING AUTHORITIES, THE EXCHANGE OF WARRANTS MAY NOT
BE TREATED THE SAME AS THE EXCHANGE OF STOCK BY STOCKHOLDERS, EACH HOLDER OF
PSHC COMMON STOCK AND EACH HOLDER OF PSHC WARRANTS IS URGED TO CONSULT SUCH
HOLDER'S OWN TAX ADVISORS TO DETERMINE THE PARTICULAR TAX CONSEQUENCES TO SUCH
HOLDER OF THE MERGER (INCLUDING THE APPLICATION AND EFFECT OF STATE, LOCAL AND
FOREIGN INCOME AND OTHER TAX LAWS).
 
  Accounting Treatment.
 
     It is intended that the Merger will be accounted for as a
pooling-of-interests for accounting and financial reporting purposes. See
"DESCRIPTION OF THE MERGER -- Accounting Treatment."
 
  Certain Differences in Shareholders' Rights.
 
     At the Effective Time, holders of PSHC Common Stock and Warrants, whose
rights are governed by PSHC's Articles of Incorporation and Bylaws and by the
FBCA, will automatically become Seacoast shareholders, and their rights as
Seacoast shareholders will be determined by Seacoast's Articles of Incorporation
and Bylaws and by the FBCA. The rights of Seacoast shareholders differ from the
rights of PSHC shareholders in certain important respects, including certain
anti-takeover effects. See "EFFECT OF THE MERGER ON RIGHTS OF SHAREHOLDERS."
 
  Comparative Market Prices Of Common Stock; Dividends.
 
     Seacoast Class A Stock is traded in the over-the-counter market and quoted
on the Nasdaq National Market under the symbol "SBCFA". PSHC Common Stock is not
traded in any established market, and infrequently trades in small amounts that
may not reflect its actual or market value. The following table sets forth the
reported closing sale prices per share for Seacoast Class A Stock and the
equivalent per share prices (as explained below) for PSHC Common Stock on
February 18, 1997, the last full business day preceding the public announcement
of the execution of the Merger Agreement, and on             , 1997, the latest
practicable date prior to the mailing of this Joint Proxy Statement. Also set
forth below are, to the knowledge of PSHC, the prices of the last trades in PSHC
Common Stock prior to each of the dates indicated. The actual number of shares
of Seacoast Class A Stock to be received for each share of PSHC Common Stock
will depend on, among other things, the Seacoast Stock Price (as defined above),
which will be determined during the Pricing Period of 20 trading days commencing
five days prior to the Effective Time. There can be no
                                        8
<PAGE>   23
 
   
assurance as to the market price of the Seacoast Class A Stock upon the Merger's
Effective Time. See "--Comparative Market Prices and Dividends."
    
 
   
<TABLE>
<CAPTION>
MARKET PRICE                                              PSHC           SEACOAST      EQUIVALENT PER
PER SHARE AT:                                        COMMON STOCK(1)   COMMON STOCK    SHARE PRICE(1)
- ---------------------------------------------------  ---------------   ------------   ----------------
<S>                                                  <C>               <C>            <C>
February 18, 1997..................................      $23.00*          $28.75           $28.66
       , 1997......................................
</TABLE>
    
 
- ---------------
 
   
(1) Based on trades known to PSHC management in a limited trading market which
    may or may not reflect the actual on market value of the PSHC Common Stock.
    
   
(2) The Equivalent Per Share Price is computed by multiplying the price of
    Seacoast Class A Stock by the Estimated Stock Exchange Ratio of .9969 shares
    of Seacoast Class A Stock for each share of PSHC Common Stock.
    
 
   
     Seacoast has paid cash dividends on its Class A Common Stock continuously
since 19  . PSHC has not paid cash dividends since 1994 on PSHC Common Stock.
    
 
COMPARATIVE PER SHARE DATA
 
   
     The following table sets forth certain comparative per share data relating
to income, cash dividends, and book value on (i) an historical basis for
Seacoast and PSHC; (ii) a pro forma combined basis per share of Seacoast Class A
Stock, giving effect to the Merger; and (iii) an equivalent pro forma basis per
share of PSHC Common Stock, giving effect to the Merger. The PSHC and Seacoast
pro forma combined information and the PSHC pro forma Merger equivalent
information give effect to the Merger on a pooling-of-interests accounting basis
and reflects the assumed Estimated Stock Exchange Ratio of .9969 of a share of
Seacoast Class A Stock for each share of PSHC Common Stock and the assumed
Estimated Warrant Exchange Ratio of .70957 of Seacoast Class A Stock for each
PSHC Warrant. See "DESCRIPTION OF THE MERGER -- Accounting Treatment." The pro
forma data are presented for information purposes only and are not necessarily
indicative of the results of operations or combined financial position that
would have resulted had the Merger been consummated at the dates or during the
periods indicated, nor are they necessarily indicative of future results of
operations or combined financial position.
    
 
     The information shown below should be read in conjunction with, and is
qualified in its entirety by, the historical financial statements of Seacoast
and PSHC, including the respective notes thereto, and the pro forma financial
information incorporated by reference herein. See "DOCUMENTS INCORPORATED BY
REFERENCE," "-- Selected Financial Data," "-- Summary Pro Forma Financial Data,"
and "PRO FORMA FINANCIAL INFORMATION."
 
   
<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER 31,
                                                              -----------------------
                                                              1996     1995     1994
                                                              -----    -----    -----
                                                                 (UNAUDITED EXCEPT
                                                                 SEACOAST AND PSHC
                                                                    HISTORICAL)
<S>                                                           <C>      <C>      <C>
INCOME BEFORE CUMULATIVE EFFECT OF CHANGE IN ACCOUNTING
  PRINCIPLE PER COMMON SHARE
  Seacoast historical.......................................  $1.77    $1.58    $1.44
  PSHC historical...........................................   1.43     1.16     1.28
  Seacoast and PSHC pro forma combined(1)...................   1.70     1.49     1.38
DIVIDENDS DECLARED PER COMMON SHARE
  Seacoast historical.......................................   0.65     0.54     0.49
  PSHC historical...........................................     --       --     0.30
BOOK VALUE PER COMMON SHARE (PERIOD END)
  Seacoast historical.......................................  15.68    14.75    12.98
  PSHC historical(2)........................................  13.77    12.11    10.01
  Seacoast and PSHC pro forma combined(1)...................  15.08    14.05    12.27
</TABLE>
    
 
- ---------------
   
(1) Represents the pro forma combined information of Seacoast and PSHC as if the
    Merger was were consummated on January 1, 1996, and was accounted for under
    pooling-of-interest method of accounting transaction.
    
   
(2) Does not include the effects of outstanding warrants and options.
    
                                        9
<PAGE>   24
 
     The PSHC pro forma Merger equivalent data presented above will change if
the actual Stock Exchange Ratio and Warrant Exchange Ratio (which will be
determined based on the market price of Seacoast Class A Stock during a 20
trading day measuring period prior to the Effective Time) are different from the
Estimate Stock Exchange Ratio and the Estimated Warrant Exchange Ratio. This
data is presented for illustration purposes only, and no inference is intended
or may be drawn concerning the actual Seacoast Stock Price which may occur or
the resulting Stock Exchange Ratio or Warrant Exchange Ratio.
 
OTHER PROPOSALS TO BE CONSIDERED AT THE SEACOAST ANNUAL MEETING
 
  Election of Directors.
 
     At the Seacoast Annual Meeting, Seacoast shareholders will be asked to
consider and vote upon the reelection of eight directors to serve on the
Seacoast Board of Directors until the Annual Meeting of Shareholders in 1998 and
until their successors have been elected and qualified. See "Election of
Seacoast Directors."
 
  Amendment of Articles of Incorporation.
 
     At the Seacoast Annual Meeting, Seacoast shareholders will also be asked to
consider and vote upon a proposal to approve proposed amendments to Seacoast's
Articles of Incorporation to clarify the voting requirements in connection with
certain business combinations. See "AMENDMENT OF SEACOAST ARTICLES OF
INCORPORATION."
 
  Ratify Auditors.
 
     At the Seacoast Annual Meeting, the Seacoast shareholders will also be
asked to ratify the appointment of Arthur Andersen LLP as independent auditors
for Seacoast for the fiscal year ending December 31, 1997. See "RATIFICATION OF
SEACOAST AUDITORS."
                                       10
<PAGE>   25
 
                            SELECTED FINANCIAL DATA
 
     The following tables present certain selected historical financial
information for Seacoast and PSHC and are derived from the respective
consolidated financial statements of Seacoast and PSHC, including the respective
notes thereto, which are incorporated by reference in this Joint Proxy
Statement. The data should be read in conjunction with the historical financial
statements, including the respective notes thereto, and other financial
information concerning Seacoast and PSHC incorporated by reference or included
herein. See "DOCUMENTS INCORPORATED BY REFERENCE."
 
                                    SEACOAST
                       SELECTED HISTORICAL FINANCIAL DATA
 
<TABLE>
<CAPTION>
                                                                               YEAR ENDED DECEMBER 31,
                                                              ---------------------------------------------------------
                                                                1996        1995        1994        1993        1992
                                                              ---------   ---------   ---------   ---------   ---------
                                                                    (IN THOUSANDS, EXCEPT PER SHARE DATA, RATIOS
                                                                      AND AVERAGE NUMBER OF SHARES OUTSTANDING)
<S>                                                           <C>         <C>         <C>         <C>         <C>
INCOME STATEMENT DATA:
  Net interest income.......................................     31,102      27,090      25,200      26,059      27,477
  Provision for loan losses.................................        450         250         145         150       1,103
  Net interest income after loan loss provision.............     30,652      26,840      25,055      25,909      26,374
  Total noninterest income excluding security gains
    (losses)................................................      8,714       7,517       6,475       7,588       7,693
  Security gains (losses)...................................         72         480         752       1,204       1,759
  Total noninterest expense.................................     27,517      24,246      23,005      24,345      26,655
  Income tax expense........................................
  Income before cumulative effect of a change in accounting
    principle...............................................      7,609       6,826       6,186       6,868       6,149
  Provision for income taxes................................      4,312       3,765       3,091       3,488       3,022
  Cumulative effect on prior years of a change in accounting
    for income taxes........................................          0           0           0         264           0
  Net income                                                      7,609       6,826       6,186       7,132       6,149
PER SHARE DATA:
  Income before cumulative effect of a change in accounting
    principle...............................................  $    1.77   $    1.58   $    1.44   $    1.60   $    1.45
  Cumulative effect on prior years of a change in accounting
    for income taxes........................................       0.00        0.00        0.00        0.06        0.00
                                                              ---------   ---------   ---------   ---------   ---------
  Net income................................................       1.77        1.58        1.44        1.66        1.45
  Cash dividends............................................       0.65         0.5        0.49        0.45        0.41
  Book value................................................  $   15.68   $   14.75   $   12.98   $   14.13   $   11.71
OTHER INFORMATION:
  Average number of shares outstanding......................  4,304,962   4,309,590   4,305,592   4,291,949   4,253,680
BALANCE SHEET DATA (PERIOD END):
  Total assets..............................................  $ 808,408   $ 771,348   $ 662,711   $ 639,404   $ 613,558
  Securities................................................    208,800     213,638     258,661     283,732     292,935
  Net Loans.................................................    467,311     410,898     289,417     255,995     247,754
  Total deposits............................................    692,757     660,967     559,629     533,486     551,368
  Shareholders' equity(1)...................................     66,769      62,200      55,584      60,257      49,707
PERFORMANCE RATIOS:
  Return on average assets..................................       1.05%       1.00%       1.02%       1.19%       1.02%
  Return on average shareholders' equity....................      11.48       11.05       10.69       13.47       12.92
  Net interest margin(2)....................................       4.63        4.32        4.57        4.80        5.07
  Dividend payout...........................................       35.9        33.4        33.5        26.5        27.9
ASSET QUALITY RATIOS:
  Net charge-offs to average loans, net of unearned
    income..................................................        .05%        .03%        .15%        .24%        .33%
  Problem assets to net loans and other real estate.........
  Nonperforming assets to net loans and other real estate...        .54        1.44         .82        2.74        3.98
  Allowance for loan losses to loans outstanding at year
    end.....................................................        .91         .98        1.15        1.40        1.62
  Allowance for loan losses to nonperforming assets.........        168          68         141         150          40
LIQUIDITY AND CAPITAL RATIOS:
  Average shareholders' equity to average assets............       9.14%       9.01%       9.51%       8.81%       7.89%
  Average loans to average deposits.........................       67.4        57.4        49.4        46.9        47.6
  Tier I capital to risk-weighted assets at year end........      14.03       13.85       18.72       18.49       17.11
  Total capital to risk-weighted assets at year end.........      15.00       14.81       19.79       19.70       18.36
  Leverage capital to assets at year end....................       8.32        7.93        9.42        8.97        8.11
</TABLE>
 
- ---------------
 
(1) Includes adjustments of $(1,482,000) in 1996, $(705,000) in 1995,
    $(4,391,000) in 1994 and $4,667,000 in 1993 related to adoption of Financial
    Accounting Standard Board No. 115 "Accounting for Certain Investments in
    Debt and Equity Securities."
(2) On a fully taxable equivalent basis.
                                       11
<PAGE>   26
 
   
                                      PSHC
    
   
                       SELECTED HISTORICAL FINANCIAL DATA
    
 
   
<TABLE>
<CAPTION>
                                                                           YEAR ENDED DECEMBER 31,
                                                              -------------------------------------------------
                                                                1996       1995      1994      1993      1992
                                                              --------   --------   -------   -------   -------
                                                              (IN THOUSANDS, EXCEPT PER SHARE DATA, RATIOS AND
                                                                    AVERAGE NUMBER OF SHARES OUTSTANDING)
<S>                                                           <C>        <C>        <C>       <C>       <C>
INCOME STATEMENT DATA:
  Total interest income.....................................  $  9,453   $  8,109   $ 5,720   $ 4,332   $ 3,871
  Total interest expense....................................     4,332      4,164     2,162     1,612     1,570
  Net interest income.......................................     5,121      3,945     3,558     2,720     2,301
  Provision for loan losses.................................       640        206       163       167       201
  Net interest income after loan loss provision.............     4,481      3,739     3,395     2,553     2,100
  Total noninterest income excluding security gains
    (losses)................................................     1,617      1,230       744       856       619
  Security gains (losses)...................................         4        (59)       12        28         4
  Total noninterest expense.................................     4,251      3,520     2,679     2,280     2,087
  Income tax expense........................................       621        443       471       409       218
  Net income................................................     1,230        947     1,001       748       418
PER SHARE DATA:
  Net income................................................      1.43       1.16      1.28      0.97      0.55
  Cash dividends............................................        --         --     0.300     0.100     0.075
  Book value(1).............................................  $  13.77   $  12.11   $ 10.01   $ 10.04   $  9.02
OTHER INFORMATION:
  Average number of shares outstanding......................   863,000    814,000   787,000   784,000   775,000
BALANCE SHEET DATA (period end):
  Total assets..............................................  $130,093   $114,533   $96,303   $80,572   $58,884
  Securities................................................    14,369     21,157    28,003    31,267    23,956
  Net Loans(2)..............................................    99,800     76,595    61,828    38,279    27,659
  Total deposits............................................   118,736    104,233    86,683    71,772    51,387
  Shareholders' equity......................................    10,226      8,995     7,391     7,416     6,619
PERFORMANCE RATIOS:
  Return on average assets..................................      1.00%      0.85%     1.16%     1.10%     0.77%
  Return on average shareholders' equity....................     12.61      11.62     13.58     10.82      6.57
  Net interest margin.......................................      4.40       3.79      4.43      4.27      4.53
  Dividend payout...........................................        --         --      0.20      0.08      0.12
ASSET QUALITY RATIOS:
  Net charge-offs to average loans, net of unearned
    income..................................................      0.10%      0.11%     0.18%     0.12%     0.32%
  Problem assets to net loans and other real estate.........      0.48       0.69      1.47      1.17      1.37
  Nonperforming assets to net loans and other real estate...      0.77       0.53      0.40      0.16      0.00
  Allowance for loan losses to loans outstanding at year
    end.....................................................      1.35       1.07      1.11      1.59      1.70
  Allowance for loan losses to nonperforming assets.........    179.45     204.20    284.15  1,030.00      0.00
LIQUIDITY AND CAPITAL RATIOS:
  Average shareholders' equity to average assets............      7.93%      7.33%     8.53%    10.13%    11.77%
  Average loans to average deposits(2)......................     83.55      70.17     60.33     52.92     49.15
  Tier I capital to risk-weighted assets at year end........     12.08      12.55     15.08     17.00     23.05
  Total capital to risk-weighted assets at year end.........     13.33      13.69     16.33     18.25     24.30
  Leverage capital to assets at year end....................      7.98       7.95      8.48      9.07     11.24
</TABLE>
    
 
   
- ---------------
    
 
   
(1) Assumes no exercise of outstanding options or Warrants to purchase PSHC
    Common Stock.
    
   
(2) Excludes loans held for sale.
    
                                       12
<PAGE>   27
 
            SELECTED CONDENSED CONSOLIDATED PRO FORMA FINANCIAL DATA
 
     The following selected unaudited pro forma financial data give effect to
the Merger as of the dates and for the periods indicated and pursuant to the
accounting basis described below. The selected unaudited pro forma financial
data are presented for informational purposes only and are not necessarily
indicative of the combined financial position or results of operations which
actually would have occurred if the transactions had been consummated at the
date and for the periods indicated or which may be obtained in the future. The
information should be read in conjunction with the unaudited pro forma financial
information appearing elsewhere in this Joint Proxy Statement. See
"-- Comparative Per Share Data" and "PRO FORMA FINANCIAL INFORMATION."
 
             SELECTED PRO FORMA COMBINED DATA FOR SEACOAST AND PSHC
 
     The following unaudited pro forma combined data give effect to the
acquisition of PSHC as of the date or at the beginning of the periods indicated,
assuming such acquisition is treated as a pooling-of-interest transaction.
 
<TABLE>
<CAPTION>
                                                                     AS OF DECEMBER 31, 1996
                                                              -------------------------------------
                                                              (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                           <C>
BALANCE SHEET DATA:
  Total assets..............................................                $938,501
  Securities................................................                 223,169
  Loans, net of unearned income.............................                 572,768
  Total deposits............................................                 811,493
  Other borrowed money......................................                  45,088
  Shareholders' equity......................................                  76,995
  Shareholders' equity (book value) per common share........                   15.08
</TABLE>
 
<TABLE>
<CAPTION>
                                                                     YEAR ENDED DECEMBER 31,
                                                            -----------------------------------------
                                                               1996           1995           1994
                                                            -----------    -----------    -----------
                                                              (IN THOUSANDS, EXCEPT PER SHARE DATA
                                                            AND AVERAGE NUMBER OF SHARES OUTSTANDING)
<S>                                                         <C>            <C>            <C>
INCOME STATEMENT DATA:
  Total interest income...................................      $61,275        $56,260        $44,761
  Total interest expense..................................       25,052         25,225         16,003
  Net interest income.....................................       36,223         31,035         28,758
  Provision for loan losses...............................        1,090            456            308
          Net interest income after loan loss provision...       35,133         30,579         28,450
  Total noninterest income................................       10,407          9,168          7,983
  Total noninterest expense...............................       31,768         27,766         25,684
  Income tax expense......................................        4,933          4,208          3,562
  Income before cumulative effect of change in accounting
     principle............................................        8,839          7,773          7,187
  Income before cumulative effect of change in accounting
     principle per share..................................         1.70           1.49           1.38
  Average common shares outstanding.......................    5,204,962      5,209,590      5,205,592
                                                              =========      =========      =========
</TABLE>
 
                                       13
<PAGE>   28
 
                            MEETINGS OF SHAREHOLDERS
 
DATES, PLACES, TIMES, AND PURPOSES
 
     PSHC.  This Joint Proxy Statement is being furnished to the holders of PSHC
Common Stock in connection with the solicitation by the PSHC Board of Directors
of proxies for use at the PSHC Special Meeting at which PSHC shareholders will
be asked to vote to approve the Merger Agreement and the transactions
contemplated therein. The PSHC Special Meeting will be held at
                              , Port St. Lucie, Florida, on
                              , 1997, at                               . M.
local time. See "DESCRIPTION OF THE MERGER."
 
  Seacoast.
 
     This Joint Proxy Statement is being furnished to the holders of Seacoast
Common Stock in connection with the solicitation by the Seacoast Board of
Directors of proxies for use at the Seacoast Annual Meeting at which Seacoast
shareholders will be asked to vote to approve the Merger Agreement and the
transactions contemplated therein, including the issuance of shares of Seacoast
Class A Stock to PSHC shareholders and holders of PSHC Warrants, to reelect
eight directors to the Seacoast Board of Directors, to amend Seacoast's Articles
of Incorporation, and to ratify Seacoast's independent auditors. The Seacoast
Annual Meeting will be held at the Indian River Plantation Beach Resort,
Hutchinson Island, 555 N.E. Ocean Boulevard, Stuart, Florida, on
                              ,                               , 1997, at 3:00
P.M., Local Time. See "DESCRIPTION OF THE MERGER."
 
RECORD DATES, VOTING RIGHTS, REQUIRED VOTES, AND REVOCABILITY OF PROXIES
 
     PSHC.  The close of business on                               , 1997, has
been fixed as the PSHC Record Date for determining holders of outstanding shares
of PSHC Common Stock entitled to notice of and to vote at the PSHC Special
Meeting. Only holders of PSHC Common Stock of record on the books of PSHC on the
PSHC Record Date are entitled to notice of and to vote at the PSHC Special
Meeting. As of the PSHC Record Date, there were                shares of PSHC
Common Stock issued and outstanding and held by                holders of
record.
 
     Holders of PSHC Common Stock are entitled to one vote on each matter
considered and voted upon at the PSHC Special Meeting for each share of PSHC
Common Stock held of record as of the PSHC Record Date. To hold a vote on any
proposal, a quorum must be assembled, which is a majority of the shares of PSHC
Common Stock issued and outstanding and entitled to vote, present in person or
represented by proxy. In determining whether a quorum exists at the PSHC Special
Meeting for purposes of all matters to be voted on, all votes "for" or
"against," as well as all abstentions, with respect to the proposal will be
counted. The vote required for the approval of the Merger Agreement is a
majority of the shares of PSHC Common Stock entitled to be cast at the PSHC
Special Meeting by holders of the issued and outstanding shares of PSHC Common
Stock. Consequently, with respect to the proposal to approve the Merger
Agreement, abstentions and broker non-votes will be counted as part of the base
number of votes to be used in determining if the proposal has received the
requisite number of base votes for approval. Thus, an abstention and a broker
non-vote will have the same effect as a vote "against" such proposal.
 
     Shares of PSHC Common Stock represented by properly executed proxies, if
such proxies are received in time and not revoked, will be voted in accordance
with the instructions indicated on the proxies. IF NO INSTRUCTIONS ARE
INDICATED, SUCH PROXIES WILL BE VOTED FOR APPROVAL OF THE MERGER AGREEMENT AND,
IN THE DISCRETION OF THE PROXY HOLDER, AS TO ANY OTHER MATTER WHICH MAY COME
PROPERLY BEFORE THE PSHC SPECIAL MEETING, AND THE HOLDERS WILL NOT BE ENTITLED
TO ASSERT DISSENTERS' RIGHTS. SEE "DESCRIPTION OF THE MERGER -- DISSENTERS'
RIGHTS." IF NECESSARY, THE PROXY HOLDER MAY VOTE IN FAVOR OF A PROPOSAL TO
ADJOURN THE PSHC SPECIAL MEETING IN ORDER TO PERMIT FURTHER SOLICITATION OF
PROXIES IN THE EVENT THERE ARE INSUFFICIENT VOTES TO APPROVE THE FOREGOING
PROPOSAL AT THE TIME OF THE PSHC SPECIAL MEETING.
 
                                       14
<PAGE>   29
 
     A PSHC shareholder who has given a proxy may revoke it at any time prior to
its exercise at the PSHC Special Meeting by (i) giving written notice of
revocation to the Secretary of PSHC, (ii) properly submitting to PSHC a duly
executed proxy bearing a later date, or (iii) attending the PSHC Special Meeting
and voting in person after notifying the Secretary that any previously submitted
proxies are revoked. All written notices of revocation and other communications
with respect to revocation of proxies should be addressed as follows: Port St.
Lucie National Bank Holding Corp., 1100 S.W. St. Lucie West Boulevard, Port St.
Lucie, Florida 34986; Attention: J. Hal Roberts, Jr.
 
     The directors and of PSHC beneficially owned, as of the PSHC Record Date,
               shares or approximately      % of the issued and outstanding
shares, of PSHC Common Stock. Each member of the Board of Directors of PSHC has
agreed to vote those PSHC shares over which such member has voting authority
(other than in a fiduciary capacity) in favor of the Merger Agreement. In
addition, executive officers of PSHC who are not PSHC directors beneficially own
               shares, or      % of PSHC Common Stock and are expected to vote
such shares in favor of the Merger. As of the PSHC Record Date, Seacoast and its
affiliates held no shares of PSHC Common Stock. None of Seacoast or any of its
directors and executive officers beneficially owned, as of the PSHC Record Date,
any shares of PSHC Common Stock. See "MEETINGS OF SHAREHOLDERS -- Record Dates,
Voting Rights, Required Votes, and Revocability of Proxies."
 
     Seacoast.  The close of business on                               , 1997,
has been fixed as the Seacoast Record Date for determining holders of
outstanding shares of Seacoast Common Stock entitled to notice of and to vote at
the Seacoast Annual Meeting. Only holders of Seacoast Common Stock of record on
the books of Seacoast on the Seacoast Record Date are entitled to notice of and
to vote at the Seacoast Annual Meeting. As of the Seacoast Record Date, there
were                shares of Seacoast Class A Stock issued and outstanding and
held by                holders of record of Seacoast Class A Stock and
          shares of Seacoast Class B Stock issued and outstanding, which were
held by approximately                holders of record.
 
     Holders of record of Seacoast Class A Stock are entitled to one vote per
share on each matter to be considered and voted upon at the Seacoast Annual
Meeting. Holders of Class B Stock are entitled to 10 votes per share on each
matter to be considered and voted upon at the Seacoast Annual Meeting.
Seacoast's Articles of Incorporation provide that, except as otherwise required
by law or by the Articles of Incorporation, holders of shares of Seacoast Class
A Stock and Class B Stock vote together as a single class on all matters. The
Seacoast Articles of Incorporation require that the holders of at least
two-thirds (66 2/3%) of the outstanding Seacoast Class A Stock approve the
Merger Agreement and the transactions contemplated therein as a separate class
as well as by a two-thirds vote of all outstanding shares of Seacoast Class A
and Class B Stock voting together a single class together with the Class B
Stock.
 
     As a result of the ten-to-one voting preference accorded by the Articles of
Incorporation to shares of Class B Stock, as of the Seacoast Record Date there
were                votes entitled to be cast by the holders of the outstanding
Seacoast Common Stock when voting together as a single class, with the holders
of the Class B Stock entitled to cast                votes or      % of such
amount on matters on which the holders of Seacoast Class A Stock and Class B
Stock vote together as a single class.
 
     Approval of the Merger Agreement and the transactions contemplated therein
and the amendments to the Articles of Incorporation will require the affirmative
vote of (i) the holders of at least two-thirds (               shares) of all of
the shares of Seacoast Class A Stock outstanding and entitled to vote at the
Annual Meeting, voting as a separate class and (ii) the holders of shares with
at least two-thirds (               shares) of all votes entitled to be cast by
all shares of Seacoast Common Stock outstanding and entitled to vote at the
Annual Meeting, voting together as a single class. The vote required for the
reelection of the eight directors is a plurality of the votes cast by the shares
of Seacoast Common Stock entitled to vote in the election, provided that a
quorum is present. The proposal to ratify Arthur Andersen LLP as independent
auditors will be approved if the votes cast by the holders of the shares of
Seacoast Common Stock present, or represented, at the Annual Meeting and
entitled to vote on the matter favoring this proposal exceed the votes cast in
opposition to the proposal.
 
                                       15
<PAGE>   30
 
     As of the Seacoast Record Date, all directors and executive officers of
Seacoast as a group (11 persons) beneficially owned approximately
shares of Seacoast Class A Stock, constituting      % of the total number of
shares of Seacoast Class A Stock outstanding at that date, and approximately
               shares of Class B Stock, constituting      % of the total number
of shares of Class B Stock outstanding at that date. Seacoast's directors and
executive officers beneficially owned as of that date, shares of Common Stock
having                votes, or      % of the total votes represented by Common
Stock outstanding on the Seacoast Record Date, and are anticipated to vote their
shares of Seacoast Common Stock in favor of the Merger and the other proposals
described herein. As of the Seacoast Record Date, PSHC held no shares of
Seacoast Common Stock. In addition, as of the Seacoast Record Date, various
subsidiaries of Seacoast, as fiduciaries, custodians, and agents, had sole or
shared voting power over                shares, or      %, of the issued and
outstanding shares of Seacoast Class A Stock, under trust agreements and other
instruments and agreements, including shares held as trustee or agent of various
Seacoast employee benefit and stock purchase plans. None of such subsidiaries
held shares of PSHC Common Stock as of the PSHC Record Date.
 
     To hold a vote on any proposal, a quorum must be present, which is a
majority of the votes entitled to be cast by the holders of the outstanding
shares of Seacoast Common Stock. With respect to the proposals to approve the
Merger Agreement and the amendments to the Seacoast Articles of Incorporation, a
majority of the Seacoast Class A Stock must also be present at the Annual
Meeting in person or by proxy to constitute a quorum. In determining whether a
quorum exists at the Seacoast Annual Meeting for purposes of all matters to be
voted on, all votes "for" or "against," as well as all abstentions, will be
counted. Approval of the proposals to amend the Seacoast Articles of
Incorporation and to approve the Merger Agreement and the transactions
contemplated therein, including the issuance of shares of Seacoast Class A
Stock, requires the affirmative vote of (i) the holders of at least two-thirds
of all of the shares of Seacoast Class A Stock outstanding and entitled to vote
at the Annual Meeting, voting as a separate class and (ii) the holders of shares
of Seacoast Class A Stock and Class B Stock with at least two-thirds of all
votes entitled to be cast by all shares of Seacoast Common Stock outstanding and
entitled to vote at the Annual Meeting, voting together as a single class.
Consequently, with respect to these two proposals, abstentions and broker
non-votes will be counted as part of the base number of votes to be used in
determining if the proposal has received the requisite number of base votes for
approval. Thus, an abstention and a broker non-vote will have the same effect as
a vote "against" such proposals.
 
     Shares of Seacoast Common Stock represented by properly executed proxies,
if such proxies are received in time and not revoked, will be voted in
accordance with the instructions indicated on the proxies. IF NO INSTRUCTIONS
ARE INDICATED, SUCH PROXIES WILL BE VOTED FOR APPROVAL OF THE MERGER AGREEMENT
AND THE TRANSACTIONS CONTEMPLATED THEREIN, INCLUDING THE ISSUANCE OF SHARES OF
SEACOAST CLASS A STOCK TO PSHC SHAREHOLDERS AND HOLDERS OF PSHC WARRANTS, FOR
APPROVAL OF THE REELECTION OF EIGHT DIRECTORS TO THE SEACOAST BOARD OF
DIRECTORS, FOR APPROVAL OF THE AMENDMENTS TO THE SEACOAST ARTICLES OF
INCORPORATION, FOR THE RATIFICATION OF THE SEACOAST INDEPENDENT AUDITORS AND, IN
THE DISCRETION OF THE PROXY HOLDER, AS TO ANY OTHER MATTER WHICH MAY COME
PROPERLY BEFORE THE SEACOAST ANNUAL MEETING. IF NECESSARY, THE PROXY HOLDER MAY
VOTE IN FAVOR OF A PROPOSAL TO ADJOURN THE SEACOAST ANNUAL MEETING IN ORDER TO
PERMIT FURTHER SOLICITATION OF PROXIES IN THE EVENT THERE ARE NOT SUFFICIENT
VOTES TO APPROVE THE FOREGOING PROPOSALS AT THE TIME OF THE SEACOAST ANNUAL
MEETING.
 
     A Seacoast shareholder who has given a proxy may revoke it at any time
prior to its exercise at the Seacoast Annual Meeting by (i) giving written
notice of revocation to the Secretary of Seacoast, (ii) properly submitting to
Seacoast a duly executed proxy bearing a later date, or (iii) attending the
Seacoast Annual Meeting and voting in person after notifying the Secretary that
he has revoked any previously submitted proxies. All written notices of
revocation and other communications with respect to revocation of proxies should
be addressed as follows: Seacoast Banking Corporation of Florida, 815 Colorado
Avenue, Stuart, Florida 34994; Attention: Sharon Mehl. Holders of Seacoast Class
A and Class B Stock have no dissenters rights of appraisal in connection with
the Merger.
 
                                       16
<PAGE>   31
 
                           DESCRIPTION OF THE MERGER
 
     The following information describes certain aspects of the Merger. This
description does not purport to be complete and is qualified in its entirety by
reference to the Appendices hereto, including the Merger Agreement, which is
attached as Appendix I to this Joint Proxy Statement and incorporated herein by
reference. All shareholders are urged to read the Appendices in their entirety.
 
GENERAL
 
     The Merger Agreement provides for the acquisition of PSHC by Seacoast
pursuant to the merger of PSHC with and into Seacoast. At the Effective Time,
each share of PSHC Common Stock then issued and outstanding (excluding shares
held by PSHC, Seacoast, or their respective subsidiaries, in each case other
than shares held in a fiduciary capacity or in satisfaction of debts previously
contracted, and excluding shares held by PSHC shareholders who perfect their
dissenters' rights) will be converted into and exchanged for a number of shares
of Seacoast Class A Stock determined by a formula that is based upon the market
price of Seacoast Class A Stock during the Pricing Period prior to Closing.
Specifically, each share of PSHC Common Stock as described in the preceding
sentence will be exchanged for that number of shares of Seacoast Class A Stock
determined by dividing (A) (i) the sum of (x) the average of the closing prices
on the Nasdaq National Market of Seacoast Class A Stock for the 20 trading days
preceding the fifth trading day preceding the Closing Date (the "Seacoast Stock
Price") multiplied by 900,000 and (y) $1,242,953, (ii) divided by the number of
shares of PSHC Common Stock plus the number of shares of PSHC Common Stock
subject to PSHC stock options and PSHC Warrants, outstanding at the Effective
Time (the "Purchase Price Per Share"), by (B) the Seacoast Stock Price (the
"Stock Exchange Ratio"). Each outstanding PSHC Warrant at the effective time of
the Merger will be exchanged for that number of shares of Seacoast Class A Stock
determined by dividing (A) the difference between the Purchase Price Per Share
and $8.26 by (B) the Seacoast Stock Price (the "Warrant Exchange Ratio").
Seacoast will also assume the obligations of PSHC under various stock plans and
programs and adopt substitute plans where appropriate. The consideration to be
received by holders of PSHC Common Stock and PSHC Warrants is subject to
possible adjustment in certain circumstances relating to certain categories of
PSHC loans. See "DESCRIPTION OF THE MERGER -- Conduct of Business Pending the
Merger (subparagraph (vi))."
 
     The last sale price per share of Seacoast Class A Stock as reported on the
Nasdaq National Market on February 18, 1997 was $28.75. If the Seacoast Stock
Price (as defined above) were $28.75 at the Effective Time, each share of PSHC
Common Stock would be converted into .9969 shares of Seacoast Class A Stock
(Estimated Stock Exchange Ratio) and each PSHC Warrant would be converted into
 .70957 shares of Seacoast Class A Stock (Estimated Warrant Exchange Ratio).
 
     The exact Stock Exchange Ratio and Warrant Exchange Ratio are each
dependent on the closing prices of Seacoast Class A Stock as reported on Nasdaq
National Market during the Pricing Period. The actual market price of a share of
Seacoast Class A Stock at the Effective Time, or on the date on which
certificates representing such shares are received by former holders of PSHC
Common Stock, may be more or less than the actual Seacoast Stock Price or the
last sale price per share of Seacoast Class A Stock on March 10, 1997 (on which
the Estimated Stock Exchange Ratio and the Estimated Warrant Exchange Ratio were
determined) or the date of the PSHC Special Meeting. PSHC shareholders are urged
to obtain information on the trading value of Seacoast Class A Stock that is
more recent than that provided in this Joint Proxy Statement. See "COMPARATIVE
MARKET PRICES AND DIVIDENDS."
 
     No fractional shares of Seacoast Class A Stock will be issued. Rather, cash
(without interest) will be paid in lieu of any fractional share interest to
which any PSHC shareholder or PSHC Warrant holder would be entitled upon
consummation of the Merger, in an amount equal to such fractional part of a
share of Seacoast Class A Stock multiplied by the Seacoast Stock Price.
 
     The Merger Agreement also contemplates that at the Effective Time, each
PSHC Stock Option to purchase or acquire shares of PSHC Common Stock, excluding
the PSHC Warrants, granted by PSHC under the PSHC Stock Plans, (as defined in
the Merger Agreement), which are outstanding at the Effective Time,
 
                                       17
<PAGE>   32
 
whether or not exercisable, will be converted into and become rights with
respect to Seacoast Class A Stock on a basis adjusted to reflect the Stock
Exchange Ratio.
 
     As of the PSHC Record Date, PSHC had        shares of PSHC Common Stock
issued and outstanding,           shares of PSHC Common Stock subject to PSHC
Warrants and           additional shares of PSHC Common Stock subject to PSHC
stock options. Seacoast will issue or reserve for issuance an aggregate of
900,000 shares of Seacoast Class A Stock in the Merger. Based on the number of
PSHC shares of Common Stock, PSHC Warrants, and PSHC stock options outstanding
on the PSHC Record Date and the Estimated Stock Exchange Ratio of .9969 and the
Estimated Warrant Exchange Ratio of .70957, it is anticipated that upon
consummation of the Merger, Seacoast would issue approximately           shares
of Seacoast Class A Stock to holders of PSHC Common Stock,           shares of
Seacoast Class A Stock to holders of PSHC Warrants, and reserve for issuance
          shares of Seacoast Class A Stock for future issuance to holders of
PSHC stock options. Accordingly, Seacoast would then have issued and outstanding
approximately           shares of Seacoast Class A Stock based on the number of
shares of Seacoast Class A Stock issued and outstanding on the Seacoast Record
Date.
 
EFFECT OF THE MERGER ON PSHC STOCK OPTIONS
 
     The Merger Agreement contemplates that at the Effective Time, each PSHC
Stock Option granted under the PSHC Stock Plans, as that term is defined in the
Merger Agreement, which are outstanding at the Effective Time, whether or not
exercisable, will be converted into and become options with respect to Seacoast
Class A Stock, and Seacoast will assume each PSHC option, in accordance with the
terms of the PSHC Stock Plan and stock option agreement by which it is
evidenced, except that from and after the Effective Time, (i) Seacoast and its
Compensation Committee will be substituted for PSHC and the Committee of PSHC's
Board of Directors (including, if applicable, the entire Board of Directors of
PSHC) administering such PSHC Stock Plan, (ii) each PSHC Stock Option assumed by
Seacoast may be exercised solely for shares of Seacoast Class A Stock (or cash,
if so provided under the terms of such PSHC Stock Option), (iii) the number of
shares of Seacoast Class A Stock subject to such PSHC option will be equal to
the number of shares of PSHC Common Stock subject to such PSHC Stock Option
immediately prior to the Effective Time multiplied by the Stock Exchange Ratio,
and (iv) the per share exercise price (or similar threshold price, in the case
of stock awards) under each such PSHC Stock Option will be adjusted by dividing
the per share exercise price under each such PSHC Stock Option by the Stock
Exchange Ratio and rounding up to the nearest cent. Seacoast will not be
obligated to issue any fraction of a share of Seacoast Class A Stock upon
exercise of PSHC Stock Options and any fraction of a share of Seacoast Class A
Stock that otherwise would be subject to a converted PSHC Stock Option will
represent the right to receive a cash payment equal to the product of such
fraction and the difference between the market value of one share of Seacoast
Class A Stock and the per share exercise price of such Stock Option. The market
value of one share of Seacoast Class A Stock will be the closing price of such
common stock on the Nasdaq National Market (as reported by The Wall Street
Journal or, if not reported thereby, any other authoritative source selected by
Seacoast) on the last trading day preceding the Effective Time. In addition,
notwithstanding any other term in the Merger Agreement, each PSHC Stock Option
which is an "incentive stock option" will be adjusted as required by Section 424
of the Code, and the regulations promulgated thereunder, so as not to constitute
a modification, extension, or renewal of the option, within the meaning of
Section 424(h) of the Code.
 
     Significantly, all restrictions or limitations on transfer with respect to
PSHC Common Stock awarded under the PSHC Stock Plans or any other plan, program,
or arrangement of any PSHC company, to the extent that such restrictions or
limitations will not have already lapsed (whether as a result of the Merger or
otherwise), and except as otherwise expressly provided in such plan, program, or
arrangement, will remain in full force and effect with respect to shares of
Seacoast Class A Stock into which such restricted stock is converted pursuant to
the Merger Agreement.
 
BACKGROUND OF AND REASONS FOR THE MERGER
 
     Background of the Merger.  Informal conversations between management
officials of PSHC and Seacoast concerning the benefits of combining their
organizations first started in 1995. These conversations
 
                                       18
<PAGE>   33
 
were accompanied by limited exchanges of information, but no further action was
taken until the following year.
 
     In April 1996, Seacoast began preliminary discussions with PSHC regarding a
possible business combination. There seemed to be general agreement during the
discussions that Seacoast's "super community bank" strategy would prove to be
increasingly effective, given the continued consolidation activities among its
larger competitors and the difficulty smaller banks have in providing a full
range of services, including brokerage, trust, and telephone and PC banking and
bill paying. There was also agreement that while PSHC had grown through market
penetration within the City of Port St. Lucie, it would be necessary to expand
outside that city to sustain its growth, and that a combination would enable
both organizations to more efficiently focus resources toward the development of
new market areas. As a result, the Long Range Planning Committee of the PSHC
Board of Directors hired Austin Associates to serve as its financial advisor and
explore merger opportunities.
 
     Following a general understanding between the parties to more carefully
explore the merits of a possible combination, the two organizations executed a
Confidentiality Agreement on May 10, 1996. During May, June and July of 1996,
Seacoast and PSHC exchanged financial and operating information with one
another. On June 19, 1996, Seacoast delivered a tentative term sheet to PSHC
outlining the basic terms of a possible combination.
 
     In June 1996, Austin Associates prepared a report for PSHC dealing with a
number of matters relating to the Board's analysis of the strategic alternatives
available to PSHC including (i) the general status of the financial services
industry, including those entities operating in PSHC's region; (ii) valuation
analyses of PSHC; (iii) historic and current bank institution stock price levels
and terms of recent financial institution mergers; (iv) consolidation trends in
the financial services industry and in Florida specifically; (v) the outlook for
increasing the potential value of PSHC Common Stock and their lack of liquidity;
and (vi) prospects for PSHC continuing as an independent entity, including its
prospects of acquiring smaller institutions in the region or expanding its
current business to further increase size and earnings as an independent entity.
In its report, Austin Associates indicated that the initial preliminary offer
from Seacoast was below the range of values it believed acceptable.
 
     After conferring with the Long Range Planning Committee, the Chairman of
the Board of Directors of PSHC, Jeffrey Furst, instructed Austin Associates in
July 1996 to contact Seacoast on the flexibility of their proposed terms with
the goal of increasing Seacoast's offer to a level acceptable under the Austin
Associates report. On July 3, 1996, PSHC delivered to Seacoast a revised term
sheet which contained the terms of PSHC's counter proposal. Upon Seacoast
declining to consider any material changes to its proposal discussions ceased on
July 16, 1996.
 
     In early November 1996, Chairman Furst received an unsolicited letter from
Seacoast for the full PSHC Board of Directors to attend a meeting with senior
management of Seacoast and their financial advisor concerning a possible merger.
On November 21, 1996, Seacoast made a presentation to the Board of PSHC
concerning a proposed merger of the two organizations. On November 26, 1996,
PSHC's Board received a summary analysis by Austin Associates of the Seacoast
proposal. Austin Associates concluded that if the Company were for sale, the new
proposal was in a range which would be fair to shareholders of PSHC, from a
financial point of view.
 
     A special meeting of the PSHC Long Range Planning Committee was held
December 3, 1996 at which the Seacoast proposal was discussed fully. PSHC's
strategic alternatives, including the apparent continuing consolidation of the
financial services industry, the consideration that PSHC might be at a
competitive disadvantage as an independent entity in a more consolidated
environment, PSHC's prospects of further increasing its size and earnings
without acquiring other financial institutions in the region, and the view of
Austin Associates that prevailing market conditions for business combinations of
financial institutions were favorable. The discussion focused on the effects
that a business combination transaction would have on PSHC's shareholders and
employees, on the communities served by PSHC and on the timing of a potential
transaction. The consensus of the Committee was to recommend that PSHC's Board
of Directors instruct
 
                                       19
<PAGE>   34
 
Austin Associates to contact Seacoast to negotiate along with Chairman Furst,
the final terms of the Seacoast offer.
 
     On December 5, 1996, a special meeting of PSHC's Board of Directors was
held. The Board of Directors, based largely on the business prospects of PSHC
and the outlook for appreciation of the value of PSHC Common Stock as an
independent entity and the favorable market conditions for business combinations
of financial institutions, concluded that exploration of a business combination
transaction involving PSHC and Seacoast was currently in the best interest of
PSHC and its shareholders. The Long Range Planning Committee's recommendation
was adopted.
 
     Between November 1996 and February 1997, each of Seacoast and PSHC
conducted due diligence reviews of each other's business and undertook intensive
negotiations as to the price and terms under which a combination might be
effected.
 
     The Board of Directors of PSHC, along with its legal and financial
advisors, met on February 11, 1997, to discuss the focus of the Merger Agreement
and related agreements. After review of the matters considered by the Board of
Directors and Executive Committee since November 1996 and the opinion of Austin
Associates that the consideration to be received by PSHC's shareholders under
the terms of the Merger Agreement was fair to PSHC's shareholders from a
financial point of view, the Board of Directors unanimously approved the Merger
Agreement and authorized the Chairman and President of PSHC to complete the
negotiations, to execute the Merger Agreement, and to take the appropriate
actions necessary to consummate the Merger as described above.
 
     The Merger Agreement was executed on February 19, 1997.
 
  PSHC's Reasons for the Merger and Recommendation of Directors.
 
     The PSHC Board of Directors, with the assistance of outside financial and
legal advisors, evaluated the financial, legal and market considerations bearing
on the decision to recommend the Merger. The terms of the Merger, including the
purchase price, are a result of arm's-length negotiations between
representatives of PSHC and Seacoast. In reaching its conclusion that the Merger
Agreement is in the best interest of PSHC and its shareholders, the PSHC Board
of Directors carefully considered, without assigning any relative or specific
values, the following material factors:
 
          (i) the financial terms of the proposed Merger, including the
     anticipated treatment of the Merger as a tax-free exchange of Seacoast
     Class A Stock for PSHC Common Stock for federal income tax purposes;
 
          (ii) the increased liquidity of the Seacoast Common Stock over the
     PSHC Common Stock as a result of its listing on the NASDAQ National Market;
 
          (iii) a comparison of the terms of the proposed Merger with comparable
     transactions, both in the Southeast and elsewhere;
 
          (iv) information concerning the business, financial condition, results
     of operations and prospects of PSHC and Seacoast;
 
          (v) competitive factors and trends toward consolidation in the banking
     industry;
 
          (vi) the review by the PSHC Board with its legal and financial
     advisors of the provisions of the Merger Agreement;
 
          (vii) the opinion rendered by Austin Associates to the PSHC Board that
     the consideration to be received in the Merger is fair from a financial
     point of view to the holders of the PSHC Common Stock;
 
          (viii) alternatives to the Merger, including proceeding on a
     stand-alone basis, in light of the economic conditions and prospects of
     Florida banking markets and the competitive environment in the economy
     generally and with the banking sector specifically; and
 
                                       20
<PAGE>   35
 
          (ix) the value received by holders of PSHC Common Stock pursuant to
     the Merger in relation to the historical trading prices and book value of
     PSHC Common Stock.
 
     While each member of the PSHC Board individually considered the foregoing
and other factors, the PSHC Board did not collectively assign any specific or
relative weights to the factors considered and did not make any determination
with respect to any individual factor. The PSHC Board collectively made its
determination with respect to the Merger based on the unanimous conclusion
reached by its members, in light of the factors that each of them considered
appropriate, that the Merger is in the best interests of the PSHC shareholders.
 
     PSHC BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT THE MERGER AGREEMENT
AND THE MERGER BE ADOPTED AND APPROVED BY ALL SHAREHOLDERS OF PSHC.
 
  Seacoast's Reasons for the Merger.
 
     In approving the Merger Agreement and the Merger, the Seacoast Board
considered a number of factors concerning the benefits of the Merger. Without
assigning any relative or specific weights to the factors, the Seacoast Board of
Directors considered the following material factors:
 
          (a) the information presented to the directors by the management of
     Seacoast concerning the business, operations, earnings, asset quality, and
     financial condition of PSHC, including the composition of the earning
     assets portfolio of PSHC;
 
          (b) the financial terms of the Merger, including the relationship of
     the value of the consideration issuable in the Merger to the market value,
     tangible book value, and earnings per share of PSHC Common Stock;
 
          (c) the nonfinancial terms of the Merger, including the anticipated
     treatment of the Merger as a tax-free exchange of PSHC Common Stock for
     Seacoast Class A Stock for federal income tax purposes;
 
          (d) the likelihood of the Merger being approved by applicable
     regulatory authorities without adverse conditions or delay;
 
          (e) the opportunity for reducing the noninterest expense of the
     operations of PSHC and the ability of the operations of PSHC after the
     Effective Time to contribute to the earnings of Seacoast;
 
          (f) the attractiveness of the PSHC franchise, the market position of
     PSHC in each of the markets in which it operates, the compatibility of the
     franchise of PSHC with the operations of Seacoast and the ability of PSHC
     to contribute to the "super community bank" strategy of Seacoast;
 
          (g) the compatibility of the community bank orientation of the
     operations of PSHC to that of Seacoast;
 
          (h) the report of Robinson-Humphrey reviewing a comparison of PSHC to
     selected peer banks and of premiums paid in other merger transactions; and
 
          (i) the advice rendered by Robinson-Humphrey as to the fairness, from
     a financial point of view, of the Exchange Ratio to the holders of Seacoast
     Common Stock.
 
     Each member of Seacoast's Board individually considered the foregoing and
other factors, but such Board did not collectively assign any specific or
relative weights to the factors considered and did not make any determination
with respect to any individual factor. Seacoast's Board collectively and
unanimously determined, in light of the factors each member considered
appropriate, that the Merger is in the best interests of Seacoast and its
shareholders.
 
     SEACOAST'S BOARD OF DIRECTORS RECOMMENDS THAT SEACOAST SHAREHOLDERS VOTE
FOR APPROVAL OF THE MERGER AND THE ISSUANCE OF SHARES OF SEACOAST CLASS A STOCK
PURSUANT TO THE MERGER AGREEMENT.
 
                                       21
<PAGE>   36
 
OPINION OF PSHC'S FINANCIAL ADVISOR
 
     PSHC retained Austin Associates to act as its financial advisor in
connection with the Merger and to render a written opinion to the PSHC Board of
Directors as to the fairness, from a financial point of view, to the holders of
PSHC Common Stock and PSHC Warrants, of the Stock Exchange Ratio and the Warrant
Exchange Ratio. Austin Associates is a recognized investment banking firm
regularly engaged in the valuation of financial institutions and their
securities in connection with mergers and acquisitions and other purposes. PSHC
selected Austin Associates to act as PSHC's financial advisor in connection with
the Merger on the basis of its reputation and qualifications in evaluating
financial institutions.
 
     Austin Associates has rendered a separate written opinion to the Board of
Directors of PSHC to the effect that the terms of the Merger are fair, from a
financial point of view, to the shareholders of PSHC as of the date of the
opinion. Austin Associates based its opinion upon, among other things: (i) the
audited financial statements of PSHC and Seacoast for the period 1991 through
1996; (ii) the reported prices and stock trading activity of PSHC and Seacoast;
(iii) publicly available information regarding the performance of certain other
companies whose business activities were believed to be generally comparable to
those of PSHC and Seacoast, (iv) the financial terms, to the extent publicly
available, of certain comparable bank merger transactions; (v) the strategic
objectives of the Merger and the synergies and other benefits of the Merger for
the combined company as described by senior management of PSHC and Seacoast, and
(vi) such other analysis and information as Austin Associates deemed relevant.
 
     No limitations were imposed on the scope of Austin Associates'
investigation. The terms of the Merger Agreement, including the Merger
considerations, were negotiated by the Boards of Directors of PSHC and Seacoast,
and their representatives, on an arm's-length basis. Austin Associates
participated in the negotiation of the terms of the Merger Agreement and other
related agreements associated with the Merger. A copy of Austin Associates'
fairness opinion is attached as Appendix II to this Joint Proxy Statement and
should be read in its entirety.
 
     In connection with rendering its opinion, Austin Associates performed a
variety of financial analyses, which are summarized below. Austin Associates
believes its analyses must be considered as a whole and that selecting portions
of such analyses and the factors considered therein, without considering all
factors and analyses, could create an incomplete view of the analyses and the
process underlying Austin Associates' opinion. The preparation of a fairness
opinion is a complex process involving subjective judgments and is not
necessarily susceptible to partial analyses or summary description. In its
analyses, Austin Associates made numerous assumptions with respect to industry
performance, business and economic conditions, and other matters, many of which
are beyond PSHC's or Seacoast's control. Any estimates contained in Austin
Associates' analyses are not necessarily indicative of future results or values,
which may be significantly different from the estimates.
 
     Transaction Summary.  The Merger Agreement provides for the aggregate
issuance of that number of shares of Seacoast Class A Stock to holders of PSHC
Common Stock, PSHC Warrants and PSHC stock options determined in accordance with
the following formula. The exchange ratio to holders of PSHC Common Stock (the
"Stock Exchange Ratio") shall be determined by dividing the Purchase Price Per
Share by the Seacoast Stock Price, both terms being defined in the Merger
Agreement and described herein. PSHC options will be converted into the right to
purchase Seacoast Class A Stock, adjusted for the Stock Exchange Ratio. The
exchange ratio to holders of PSHC Warrants shall be determined by dividing (1)
the difference between the Purchase Price Per Share and $8.26 (the exercise
price for all warrants) by (ii) the Seacoast Stock Price. PSHC has the right to
terminate the transaction if the Purchase Price Per Share is less than $24.62.
The Stock Exchange Ratio equaled .9969 and the Warrant Exchange Ratio equaled
 .70957 based on the $28.75 closing price of Seacoast Class A Stock on February
18, 1997, and accordingly the aggregate value of the transaction was $25.9
million on such date.
 
     Seacoast Stock Value.  Based on the closing prices of Seacoast Class A
Stock, during the last 90 days, Seacoast's Class A Stock value has ranged
between $25.625 and $29.25 per share. Seacoast reported earnings per share of
$.45 in the fourth quarter and $1.77 for all of 1996. The 1996 net income was
negatively impacted by a one-time charge of $.07 per share from the
recapitalization of the FDIC's Savings Association Insurance
 
                                       22
<PAGE>   37
 
Fund ("SAIF"). Therefore, Seacoast's normalized earnings per share for 1996 was
$1.84. At $28.75 per share, the value of Seacoast Class A Stock represents 15.7
X normalized 1996 earnings per share and 203% of Seacoast's December 31, 1996
tangible book value per share. Austin Associates compared Seacoast's Class A
Stock trading multiples to 13 Southeast banking organizations headquartered in
Alabama, Florida, Georgia, North Carolina, and South Carolina with assets
ranging from $300 million to $1.9 billion (the "Peer Group"). As of March 10,
1997, the median price-to-tangible book multiple for the Peer Group was 217%
compared to Seacoast's Class A Stock multiple of 203%. The median
price-to-earnings multiple for the Peer Group was 15.9 X compared to Seacoast's
Class A Stock multiple of 15.7x. The median dividend yield for the Peer Group
was 2.03% compared to Seacoast's Class A Stock dividend yield of 2.75%. The
median return on average assets ("ROA") of the Peer Group for 1996 was 0.96%
compared to Seacoast's ROA of 1.05%. The median return on average equity ("ROE")
of the Peer Group for 1996 was 11.8% compared to Seacoast's ROE of 11.5%.
 
     Comparative Transactions.  Austin Associates reviewed comparative prices in
sale of control transactions in Florida for banks having assets of up to $500
million. Austin Associates looked specifically at 23 transactions announced
during 1996. The median multiples for these transactions were 205% of tangible
book value and 19.6 times earnings. Austin Associates also screened those
transactions for targets which had realized profitability levels consistent with
PSHC. These targets were considered to be more profitable than the group as a
whole. The median multiples for the resulting 10 transactions were 232% of
tangible book value and 15.1 times earnings. The market value of the
consideration to be received by holders of PSHC Common Stock and PSHC Warrants
in the Merger approximates 255% of PSHC's tangible book value at December 31,
1996, and 21.2 times PSHC's consolidated earnings per share for the 12 months
ended December 31, 1996.
 
     Contribution Analysis.  Austin Associates compared the pro forma ownership
interest in Seacoast that holders of PSHC Common Stock and PSHC Warrants would
receive, in the aggregate, to the contribution by PSHC to the total assets,
equity and net income of the combined organization. Based on December 31, 1996
information, holders of PSHC Common Stock and PSHC Warrants would own
approximately 17.5% of Seacoast on a pro forma basis. PSHC's contribution of
total assets equaled 13.8%, the contribution of total equity equaled 13.3%, and
the contribution of 1996 net income equaled 13.9%.
 
     Summary Pro Forma Analysis.  Austin Associates also reviewed the pro forma
effect of the Merger to PSHC's and Seacoast's earnings per share and book value
per share. PSHC recorded fully diluted earnings per share in 1996 of $1.42 and a
book value of $13.77 per share as of December 31, 1996. Giving effect to the
Merger through December 31, 1996, the equivalent PSHC earnings per share would
have equaled $1.69, an increase of 19.0% over actual results. Book value per
share would have increased to $15.08 per share, an increase of 27.3% over actual
results. Giving effect to the Merger, Seacoast's book value per share would be
diluted by $.60 or 3.8% and earnings per share would be diluted by $.07 or
3.95%.
 
     Discounted Cash Flow Analysis.  Austin Associates performed a discounted
cash flow ("DCF") analysis of the value of PSHC Common Stock and Seacoast Class
A Stock as of December 31, 1996. The discounted cash flow results were based on
projections, discount rates and terminable values considered reasonable by
Austin Associates for the periods ending December 31, 1997 to December 31, 2001.
The DCF value of PSHC was determined to be in the range of $18.2 to $24.7
million. The value of the Merger at $26.1 million is approximately 5.7% to 43.4%
above the range of DCF values of PSHC determined by Austin Associates. The DCF
value of Seacoast, without consideration of the Merger, was determined to be in
the range of $23.50 to $30.50 per share.
 
     Dividends.  Austin Associates reviewed the cash dividends to be received by
PSHC shareholders as a result of the Merger. Based on an estimated exchange
ratio of .9969 shares of Seacoast Class A Stock for each share of PSHC Common
Stock, equivalent dividends to PSHC shareholders would be $.80. No cash
dividends have been paid to PSHC shareholders since 1994.
 
     The summary set forth above does not purport to be a complete description
of the analyses performed by Austin Associates. Further, Austin Associates did
not conduct a physical inspection of any of the properties or assets of PSHC or
Seacoast. Austin Associates has assumed and relied upon the accuracy and
completeness of the financial and other information provided to it or publicly
available, has relied upon the representations and warranties of PSHC and
Seacoast made pursuant to the Merger Agreement, and has not independently
 
                                       23
<PAGE>   38
 
attempted to verify any of such information. Austin Associates has also assumed
that the conditions to the Merger as set forth in the Merger Agreement would be
satisfied and that the Merger would be consummated on a timely basis in the
manner contemplated by the Merger Agreement. No limitations were imposed by PSHC
or Seacoast upon Austin Associates on the scope of its investigation nor were
any specific instructions given to Austin Associates in connection with its
fairness opinion.
 
     For Austin Associates' services as financial advisor, PSHC will pay the
firm fees of $35,000, plus a contingent amount equal to .5% of the transaction
value when the Merger is consummated. PSHC estimates that total fees under this
arrangement will be $163,000. In addition, PSHC has agreed to reimburse Austin
Associates for reasonable out-of-pocket expenses and indemnify Austin Associates
against certain liabilities, including liabilities under the securities laws.
Austin Associates has no other material relationship with any of the parties to
the merger or their affiliation.
 
     THE FULL TEXT OF AUSTIN ASSOCIATES' OPINION AS OF THE DATE OF THIS JOINT
PROXY STATEMENT, WHICH SETS FORTH CERTAIN ASSUMPTIONS MADE, MATTERS CONSIDERED,
AND LIMITATIONS ON REVIEW UNDERTAKEN IS ATTACHED AS APPENDIX II TO THIS JOINT
PROXY STATEMENT, IS INCORPORATED HEREIN BY REFERENCE, AND SHOULD BE READ IN ITS
ENTIRETY IN CONNECTION WITH THIS JOINT PROXY STATEMENT. THE SUMMARY OF THE
OPINION OF AUSTIN ASSOCIATES SET FORTH IN THIS JOINT PROXY STATEMENT IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE OPINION. AUSTIN ASSOCIATES'
OPINION IS DIRECTED ONLY TO THE FAIRNESS, FROM A FINANCIAL POINT OF VIEW, OF THE
STOCK EXCHANGE RATIO TO THE HOLDERS OF PSHC COMMON STOCK AND OF THE WARRANT
EXCHANGE RATIO TO THE HOLDERS OF PSHC WARRANTS AND DOES NOT CONSTITUTE A
RECOMMENDATION TO ANY HOLDER OF PSHC COMMON STOCK OR PSHC WARRANTS OR ANY HOLDER
OF SEACOAST COMMON STOCK AS TO HOW SUCH SHAREHOLDER SHOULD VOTE ON THE MERGER.
 
OPINION OF SEACOAST'S FINANCIAL ADVISOR
 
  General
 
     Seacoast retained Robinson-Humphrey to act as its financial adviser in
connection with the Merger. Robinson-Humphrey has provided various investment
banking services to Seacoast in the past, and is a market maker in Seacoast
Class A Stock. Robinson-Humphrey has rendered an opinion to Seacoast's Board of
Directors that, based on the matters set forth therein, consideration to be paid
pursuant to the Merger is fair, from a financial point of view, to Seacoast's
shareholders. The text of such opinion is set forth in Appendix III to this
Joint Proxy Statement and should be read in its entirety by shareholders of
Seacoast.
 
     The aggregate number of shares of Seacoast Class A Stock to be received by
PSHC shareholders and warrant holders in the Merger and the basis for
determining the Stock Exchange Ratio and Warrant Exchange Ratio was determined
by PSHC and Seacoast in arms-length negotiations in which Robinson-Humphrey
participated. No limitations were imposed by the Board of Directors or
management of Seacoast upon Robinson-Humphrey with respect to the investigations
made or the procedures followed by Robinson-Humphrey in rendering its opinion.
 
     In connection with rendering its opinion to Seacoast's Board of Directors,
Robinson-Humphrey performed a variety of financial analysis. However, the
preparation of a fairness opinion involves various determinations as to the most
appropriate and relevant methods of financial analysis and the application of
those methods to the particular circumstances, and, therefore, such an opinion
is not readily susceptible to summary description. Robinson-Humphrey, in
conducting its analysis and in arriving at its opinion, has not conducted a
physical inspection of any of the properties or assets of PSHC, and has not made
or obtained any independent valuation or appraisals of any properties, assets or
liabilities of PSHC. Robinson-Humphrey has assumed and relied upon the accuracy
and completeness of the financial and other information that was provided to it
by Seacoast or that was publicly available. Its opinion is necessarily based on
economic, market and other conditions as in effect on, and the information made
available to it as of, the date of its analysis.
 
  Valuation Methodologies
 
     In connection with its opinion on the Merger and the presentation of that
opinion to Seacoast's Board of Directors, Robinson-Humphrey performed two
valuation analyses with respect to PSHC: (i) an analysis of comparable prices
and terms of recent transactions involving banks purchasing other banks; and
(ii) a discounted cash flow analysis. For purposes of the comparable transaction
analysis, Seacoast Class A Stock
 
                                       24
<PAGE>   39
 
was valued at $28.50 per share, the closing price on March 5, 1997. Each of
these methodologies is discussed briefly below.
 
  Comparable Transaction Analysis.
 
     Robinson-Humphrey performed the analysis of premiums paid for selected
banks with comparable characteristics to PSHC. Comparable transactions were
considered to be (i) transactions where the seller was a bank with assets less
than $200 million located in Florida since January 1, 1996, (ii) transactions
since January 1, 1996, where the seller was a bank located in the Southeast with
total assets less than $200 million.
 
  Florida Group Comparison
 
     Based on the first group of the foregoing transactions, financial
institutions purchasing banks in Florida with assets less than $200 million
since January 1, 1996, the analysis yielded a range of transaction values to
book value of 1.01 times to 2.58 times, with a mean of 2.01 times and a median
of 2.05 times. These compare to a transaction value for the Merger of
approximately 2.02 times PSHC's book value as of December 31, 1996.
 
     The analysis yielded a range of transaction values as a multiple of
tangible book value for the comparable transactions ranging from 1.30 times to
2.58 times, with a mean of 2.05 times and a median of 2.06 times. These compare
to a transaction value for the Merger of approximately 2.02 times PSHC's book
value as of December 31, 1996.
 
     The analysis yielded a range of transaction values as a multiple of
trailing twelve month earnings per share. These values ranged from 13.48 times
to 26.69 times, with a mean of 18.67 times and a median of 18.58 times. These
compare to a transaction value to PSHC's last twelve months earnings as of
December 31, 1996 of approximately 16.82 times for the Merger.
 
     The analysis yielded a range of transaction values as a percent of total
assets. These values ranged from 9.51 percent to 27.26 percent, with a mean of
17.75 percent and a median of 17.69 percent. These compare to a transaction
value to PSHC's December 31, 1996 total assets of 18.61 percent for the Merger.
 
  Southeastern Group Comparison
 
     Based on the second group of transactions since January 1, 1996, where the
seller was a bank located in the Southeast with total assets less than $200
million, the analysis yielded a range of transaction values to book value of
0.92 times to 3.07 times, with a mean of 1.92 times and a median of 1.90 times.
These compare to a transaction value for the Merger of approximately 2.02 times
PSHC's book value as of December 31, 1996.
 
     The analysis yielded a range of transaction values as a multiple of
tangible book value for the comparable transactions ranging from 1.14 times to
3.22 times, with a mean of 1.917 times and a median of 1.92 times. These compare
to a transaction value for the Merger of approximately 2.02 times PSHC's book
value as of December 31, 1996.
 
     The analysis yielded a range of transaction values as a multiple of
trailing twelve month earnings per share. These values ranged from 5.43 times to
46.97 times, with a mean of 19.19 times and a median of 18.85 times. These
compare to a transaction value to PSHC's last twelve months earnings as of
December 31, 1996 of approximately 16.82 times for the Merger.
 
     The analysis yielded a range of transaction values as a percent of total
assets. These values ranged from 8.58 percent to 35.08 percent, with a mean of
19.13 percent and a median of 17.64 percent. These compare to a transaction
value to the December 31, 1996 total assets of 20.63 percent for the Merger.
 
     No company or transaction used in the comparable transaction analysis is
identical to PSHC. Accordingly, an analysis of the foregoing necessarily
involves complex considerations and judgments, as well as other factors that
affect the public trading value or the acquisition value of the company to which
it is being compared.
 
  Discounted Cash Flow Analysis
 
     Using discounted cash flow analysis, Robinson-Humphrey estimated the
present value of the future stream of after-tax cash flows that PSHC could
produce through 2000, under various circumstances, assuming that PSHC performed
in accordance with the earnings/return projections of management at the time
that
 
                                       25
<PAGE>   40
 
PSHC entered into acquisition discussions in November 1996. Robinson-Humphrey
estimated the terminal value for PSHC at the end of the period by applying
multiples of earnings ranging from 10.0x to 14.0x and then discounting the cash
flow streams, dividends paid to shareholders and terminal value using differing
discount rates ranging from 10.0 percent to 12.0 percent chosen to reflect
different assumptions regarding the required rates of return of PSHC and the
inherent risk surrounding the underlying projections. This discounted cash flow
analysis indicated a reference range of $21.2 million to $29.3 million for PSHC.
 
  Compensation of Robinson-Humphrey
 
     Pursuant to an engagement letter dated as of March 4, 1997 between Seacoast
and Robinson-Humphrey, Seacoast agreed to pay Robinson-Humphrey a fee of $50,000
for preparing and delivering the fairness opinion and an incremental success fee
(to be paid at the closing of the Merger) equal to approximately 0.55% of the
total value of the consideration paid by Seacoast to holders of PSHC Common
Stock and Warrants less the fairness opinion fee. Seacoast estimates that total
fees under this arrangement will be approximately $144,000. Seacoast has also
agreed to indemnify and hold harmless Robinson-Humphrey and its officers and
employees against certain liabilities in connection with its services under the
engagement letter, except for liabilities resulting from the negligence of
Robinson-Humphrey.
 
     As part of its investment banking business, Robinson-Humphrey is regularly
engaged in the valuation of securities in connection with mergers and
acquisitions, negotiated underwritings, secondary distributions of listed and
unlisted securities, private placements, and valuations for estate, corporate
and other purposes. Seacoast's Board of Directors decided to retain
Robinson-Humphrey based on its experience as a financial advisor in mergers and
acquisitions of financial institutions, particularly transactions in the
Southeastern region of the U.S., and its knowledge of financial institutions and
Seacoast in particular.
 
EFFECTIVE TIME OF THE MERGER
 
     Subject to the conditions to the obligations of the parties to effect the
Merger, the Effective Time will occur on the date and at the time that the
Florida Articles of Merger relating to the Merger is declared effective with the
Florida Secretary of State. Unless otherwise agreed upon by PSHC and Seacoast,
and subject to the conditions to the obligations of the parties to effect the
Merger, the parties will use their reasonable efforts to cause the Effective
Time to occur on the first business day following the last to occur of (i) the
effective date (including the expiration of any applicable waiting period) of
the last consent of any regulatory authority required for the Merger and (ii)
the date on which the shareholders of PSHC and Seacoast approve the matters
relating to the Merger Agreement required to be approved by such shareholders by
applicable law.
 
     No assurance can be provided that the necessary shareholder and regulatory
approvals can be obtained or that other conditions precedent to the Merger can
or will be satisfied. PSHC and Seacoast anticipate that all conditions to
consummation of the Merger will be satisfied so that the Merger can be
consummated during the first half of 1997. However, delays in the consummation
of the Merger could occur.
 
     The Board of Directors of either PSHC or Seacoast generally may terminate
the Merger Agreement if the Merger is not consummated by August 31, 1997, unless
the failure to consummate by that date is the result of a breach of the Merger
Agreement by the party seeking termination. See "--Conditions to Consummation of
the Merger" and "--Waiver, Amendment, and Termination."
 
DISTRIBUTION OF SEACOAST STOCK CERTIFICATES
 
     Promptly after the Effective Time, Seacoast will cause the Exchange Agent,
to mail to each holder of record of a certificate or certificates (collectively,
the "Certificates") which, immediately prior to the Effective Time, represented
outstanding shares of PSHC Common Stock, and to each holder of record of PSHC
Warrants, a letter of transmittal and instructions for use in effecting the
surrender and cancellation of the Certificates and Warrants in exchange for
certificates representing shares of Seacoast Class A Stock.
 
     HOLDERS OF PSHC COMMON STOCK AND PSHC WARRANTS SHOULD NOT SEND IN THEIR
CERTIFICATES REPRESENTING PSHC COMMON STOCK OR PSHC WARRANTS UNTIL THEY RECEIVE
THE LETTER OF TRANSMITTAL AND INSTRUCTIONS.
 
                                       26
<PAGE>   41
 
     Upon surrender to the Exchange Agent of Certificates for PSHC Common Stock
or PSHC Warrants, together with a properly completed letter of transmittal,
there will be issued and mailed to each holder of PSHC Common Stock and PSHC
Warrants (other than shares as to which holders have perfected dissenters'
rights) surrendering such items a certificate or certificates representing the
number of shares of Seacoast Class A Stock to which such holder is entitled, if
any, and a check for the amount to be paid in lieu of any fractional share
(without interest), together with all undelivered dividends or distributions in
respect of such shares (without interest thereon).
 
     After the Effective Time, to the extent permitted by law, holders of PSHC
Common Stock and PSHC Warrants of record as of the Effective Time will be
entitled to vote at any meeting of Seacoast shareholders the number of whole
shares of Seacoast Class A Stock into which their shares of PSHC Common Stock
and PSHC Warrants have been converted, regardless of whether such shareholders
have surrendered their PSHC Common Stock Certificates or PSHC Warrants. Whenever
a dividend or other distribution is declared by Seacoast on Seacoast Class A
Stock, the record date for which is at or after the Effective Time, the
declaration will include dividends or other distributions on all shares issuable
pursuant to the Merger Agreement, but, beginning 30 days after the Effective
Time, no dividend or other distribution payable after the Effective Time with
respect to Seacoast Class A Stock will be paid to the holder of any PSHC Common
Stock Certificate or PSHC Warrant until the holder properly surrenders the
certificates for such instruments in accordance with the Exchange Agent's
instructions. Upon proper surrender of such PSHC Common Stock Certificate or
PSHC Warrant, however, both the Seacoast Class A Stock certificate, together
with all undelivered dividends or other distributions (without interest) and any
undelivered cash payments to be paid in lieu of fractional shares (without
interest), will be delivered and paid with respect to each share or PSHC Warrant
represented by such certificate. In no event will the holder of any surrendered
Certificate(s) or PSHC Warrants be entitled to receive interest on any cash to
be issued to such holder, and in no event will PSHC, Seacoast, or the Exchange
Agent be liable to any holder of PSHC Common Stock or PSHC Warrant for any
Seacoast Class A Stock or dividends thereon or cash delivered in good faith to a
public official pursuant to any applicable abandoned property, escheat, or
similar law.
 
     Upon and after the Effective Time, there will be no transfers of shares of
PSHC Common Stock on PSHC's stock transfer books. If Certificates representing
shares of PSHC Common Stock are presented for transfer after the Effective Time,
they will be canceled and exchanged for the shares of Seacoast Class A Stock and
a check for the amount due in lieu of fractional shares, if any, deliverable in
respect thereof.
 
     Upon and after the Effective Time, holders of PSHC Certificates and PSHC
Warrants will have no rights with respect to the shares of PSHC Common Stock
formerly represented thereby other than the right to surrender such Certificates
and PSHC Warrants and receive in exchange therefor the shares of Seacoast Class
A Stock, if any, to which such holders are entitled, as described above, or the
right to perfect their dissenters' rights.
 
     If any certificate for Seacoast Class A Stock is to be issued in a name
other than that in which the PSHC Certificate or PSHC Warrant surrendered for
exchange is issued, the PSHC Certificate or PSHC Warrant so surrendered shall be
properly endorsed and otherwise in proper form for transfer, and the person
requesting such exchange shall affix any requisite stock transfer tax stamps to
the certificates surrendered, shall provide funds for their purchase, or shall
establish to the exchange agent's satisfaction that such taxes are not payable.
 
CONDITIONS TO CONSUMMATION OF THE MERGER
 
     Consummation of the Merger is subject to various conditions, including (i)
receipt of the approval of the Merger Agreement by the shareholders of PSHC as
required by the PSHC Articles of Incorporation and the FBCA, (ii) receipt of the
approval of the Merger Agreement and the transactions contemplated therein,
including the issuance of shares of Seacoast Class A Stock, by the shareholders
of Seacoast as required by Seacoast's Articles of Incorporation, the FBCA and
rules of the NASD, (iii) receipt of certain regulatory approvals required for
consummation of the Merger, (iv) receipt of a favorable opinion of Alston & Bird
as to the Merger constituting a reorganization for federal income tax purposes,
(v) receipt of approval of the shares of Seacoast Class A Stock issuable
pursuant to the Merger for listing on the Nasdaq National Market, subject
 
                                       27
<PAGE>   42
 
to official notice of issuance, (vi) the Registration Statement being declared
effective and all necessary SEC and state approvals relating to the issuance or
trading of the shares of Seacoast Class A Stock issuable pursuant to the Merger
shall have been received, (vii) the accuracy, as of the date of the Merger
Agreement and as of the Effective Time, of the representations and warranties of
PSHC and Seacoast as set forth in the Merger Agreement, (viii) the performance
of all agreements and the compliance with all covenants of PSHC and Seacoast as
set forth in the Merger Agreement, (ix) receipt by Seacoast and PSHC of a letter
from Arthur Andersen LLP, dated as of the Effective Time, to the effect the
Merger will qualify for pooling-of-interests accounting treatment; (x) receipt
by Seacoast and PSHC of a letter from KPMG Peat Marwick LLP, dated as of the
Effective Time, to the effect that such firm is not aware of any matters
relating to PSHC and its subsidiaries that would preclude the Merger from
qualifying for pooling-of-interests accounting treatment; (xi) receipt of all
consents required for consummation of the Merger or for the preventing of any
default under any contract or permit which, if not obtained or made, is
reasonably likely to have, individually or in the aggregate, a material adverse
effect; (xi) the absence of any law or order or any action taken by any court,
governmental, or regulatory authority prohibiting, restricting, or making
illegal the consummation of the transaction; (xii) that the PSHC shareholders'
equity as of the Closing is not less that PSHC's shareholders' equity as of
December 31, 1996, excluding certain items, and (xiii) satisfaction of certain
other conditions, including the receipt of agreements of affiliates of PSHC
relating to claims against PSHC or Seacoast, non-competition and securities law
compliance, and various certificates from the officers of PSHC and Seacoast. See
"-- Regulatory Approvals" and "-- Waiver, Amendment, and Termination."
 
     No assurance can be provided as to when or if all of the conditions
precedent to the Merger can or will be satisfied or waived by the party
permitted to do so. In the event the Merger is not effected on or before August
31, 1997, the Merger Agreement may be terminated and the Merger abandoned by a
vote of a majority of the Board of Directors of either PSHC or Seacoast. See
"-- Waiver, Amendment, and Termination."
 
REGULATORY APPROVALS
 
     The Merger may not proceed in the absence of receipt of the requisite
regulatory approvals. ALTHOUGH SEACOAST AND PSHC HAVE NO REASON TO BELIEVE THAT
THE NECESSARY REGULATORY APPROVALS WILL NOT BE OBTAINED, NO ASSURANCE CAN BE
GIVEN THAT SUCH REGULATORY APPROVALS WILL BE OBTAINED OR AS TO THE TIMING OF ANY
SUCH APPROVALS. There also can be no assurance that any such approvals will not
impose conditions or be restricted in a manner (including requirements relating
to the raising of additional capital or the disposition of assets) which in the
reasonable judgment of the Board of Directors of Seacoast would so materially
adversely impact the economic or business benefits of the transactions
contemplated by the Merger Agreement that, had such condition or requirement
been known, Seacoast would not, in its reasonable judgment, have entered into
the Merger Agreement.
 
     PSHC and Seacoast are not aware of any material governmental approvals or
actions that are required for consummation of the Merger, except as described
below. Should any other approval or action be required, it presently is
contemplated that such approval or action would be sought.
 
     The Merger will require the prior approval of the Federal Reserve, pursuant
to Section 3 of the BHC Act. An application was filed with the Federal Reserve
on March 21, 1997. In evaluating the Merger, the Federal Reserve must consider,
among other factors, the financial and managerial resources and future prospects
of the institutions and the convenience and needs of the communities to be
served. The relevant statutes prohibit the Federal Reserve from approving the
Merger if (i) it would result in a monopoly or be in furtherance of any
combination or conspiracy to monopolize or attempt to monopolize the business of
banking in any part of the United States or (ii) its effect in any section of
the country may be to substantially lessen competition or to tend to create a
monopoly, or if it would be a restraint of trade in any other manner, unless the
Federal Reserve finds that any anticompetitive effects are outweighed clearly by
the public interest and the probable effect of the transaction in meeting the
convenience and needs of the communities to be served. The Merger may not be
consummated until the 15th day following the date of the Federal Reserve
approval, during which time the United States Department of Justice may
challenge the transaction on antitrust grounds. The commencement of any
antitrust action would stay the effectiveness of the approval of the agencies,
unless a
 
                                       28
<PAGE>   43
 
court of competent jurisdiction specifically orders otherwise. The parties have
no reason to believe that the Merger will be questioned as anticompetitive.
 
     The merger of PSNB with and into FNB (the "Bank Merger") is anticipated to
occur immediately subsequent to the Effective Time. The consummation of the Bank
Merger is subject to the receipt of all requisite regulatory approvals,
including the approval of the Office of the Comptroller of the Currency ("OCC").
An Affiliated Bank and Thrift Combination Application was filed with the OCC on
March 25, 1997 to obtain regulatory approval for the Bank Merger under Title 12
of the United States Code, Section 15a. The OCC's approval is required only with
regard to the Bank Merger, and the consummation of the Merger is not conditioned
upon the OCC approval of the Bank Merger.
 
WAIVER, AMENDMENT, AND TERMINATION
 
     To the extent permitted by applicable law, PSHC and Seacoast may amend the
Merger Agreement by written agreement at any time before or after approval of
the Merger Agreement by the PSHC and Seacoast shareholders; provided, however,
that after the Shareholder Meetings, no amendment may alter the manner or basis
in which shares of PSHC Common Stock or the PSHC Warrants will be exchanged for
Seacoast Class A Stock without the requisite approval of the holders of the
issued and outstanding shares of PSHC Common Stock, PSHC Warrants and Seacoast
Common Stock entitled to vote thereon. In addition, prior to or at the Effective
Time, either PSHC or Seacoast, or both, acting through their respective Board of
Directors, chief executive officer or other authorized officers may waive any
default in the performance of any term of the Merger Agreement by the other
party, may waive or extend the time for the compliance or fulfillment by the
other party of any and all of its obligations under the Merger Agreement, and
may waive any of the conditions precedent to the obligations of such party under
the Merger Agreement, except any condition that, if not satisfied, would result
in the violation of any applicable law or governmental regulation. No such
waiver will be effective unless written and unless executed by a duly authorized
officer of PSHC or Seacoast, as the case may be.
 
     The Merger Agreement may be terminated and the Merger abandoned at any time
prior to the Effective Time (i) by the mutual consent of PSHC and Seacoast; (ii)
by PSHC or Seacoast (a) in the event of any inaccuracy of any representation or
warranty of the other party contained in the Merger Agreement which cannot be or
has not been cured within 30 days after giving written notice to the breaching
party of such inaccuracy and which breach is reasonably likely, in the opinion
of the non-breaching party, to have, individually or in the aggregate, a PSHC or
Seacoast Material Adverse Effect (as defined in the Merger Agreement), as
applicable, on the breaching party, (b) in the event of a material breach by the
other party of any covenant or agreement contained in the Merger Agreement which
cannot be or has not been cured within 30 days after the giving of written
notice to the breaching party of such breach, (c) if the Merger is not
consummated by August 31, 1997, provided that the failure to consummate is not
due to the breach by the party electing to terminate, (d) if (1) any approval of
any regulatory authority required for consummation of the Merger and the other
transactions contemplated by the Merger Agreement has been denied by final
nonappealable action, or if any action taken by such authority is not appealed
within the time limit for appeal or (2) the shareholders of PSHC or Seacoast
fail to vote their approval of the matters submitted for the approval by such
shareholders at the Shareholder Meetings, or (e) if any of the conditions
precedent to the obligations of such party to consummate the Merger have not
been satisfied, fulfilled, or waived by the appropriate party by August 31, 1997
(provided that the terminating party is not then in breach of any
representation, warranty, covenant or other agreement contained in the Merger
Agreement); (iii) by Seacoast, in the event that the PSHC Board of Directors
fails to reaffirm its approval of the Merger (to the exclusion of any other
Acquisition Proposal (as defined in the Merger Agreement)) or if the PSHC Board
has resolved not to reaffirm the Merger or has affirmed, recommended or
authorized entering into any other Acquisition Proposal or other transaction
involving a merger, share exchange, consolidation or transfer of substantially
all of the assets of PSHC; or (iv) by PSHC in the event that the Purchase Price
Per Share is less than $24.62.
 
     If the Merger is terminated as described above, the Merger Agreement will
become void and have no effect, except that certain provisions of the Merger
Agreement, including those relating to the obligations to
 
                                       29
<PAGE>   44
 
share certain expenses, maintain the confidentiality of certain information
obtained, and return all documents obtained from the other party under the
Merger Agreement, will survive. In addition, termination of the Merger Agreement
will not relieve any breaching party from liability for any uncured willful
breach of a representation, warranty, covenant, or agreement giving rise to such
termination.
 
DISSENTERS' RIGHTS
 
     If the Merger Agreement and the transactions contemplated thereby are
consummated, any shareholder of PSHC who properly perfects his statutory
dissenter's rights of appraisal may be entitled to receive in cash the fair
value of such shareholder's shares of PSHC Common Stock determined immediately
prior to the Merger, excluding any appreciation or depreciation in anticipation
of the Merger. FAILURE TO STRICTLY COMPLY WITH THE PROCEDURES PRESCRIBED BY
APPLICABLE LAW WILL RESULT IN THE LOSS OF DISSENTERS' RIGHTS.
 
     Any shareholder of PSHC entitled to vote on the Merger Agreement has the
right to receive payment of the fair value of his or her shares of PSHC Common
Stock upon compliance with the applicable provisions of the FBCA. A shareholder
may dissent as to all or less than all of the shares that are registered in his
or her name. Any PSHC shareholder intending to enforce the right to dissent (i)
must not vote in favor of the Merger Agreement, and (ii) must file a written
notice of intent to demand payment for his or her shares (the "Objection
Notice") with PSHC, 1100 S.W. St. Lucie West Boulevard, Port St. Lucie, Florida
34986 (telephone (561) 340-2800, Attention: J. Hal Roberts, Jr.), before the
vote on the proposal to approve the Merger Agreement and the transactions
contemplated thereby is taken at the meeting. The Objection Notice must state
that the shareholder intends to demand payment for his or her shares of PSHC
Common Stock if the Merger is effected. A VOTE AGAINST APPROVAL OF THE MERGER
AGREEMENT, IN AND OF ITSELF, WILL NOT CONSTITUTE AN OBJECTION NOTICE SATISFYING
THE REQUIREMENTS OF THE FBCA.
 
     If the Merger Agreement is approved by PSHC's shareholders at the PSHC
Special Meeting, each shareholder who has properly filed an Objection Notice and
not voted in favor of the Merger Agreement will be notified by PSHC of such
approval within 10 days of the PSHC Special Meeting. Within 20 days following
receipt of such notice, any shareholder electing to dissent must file a notice
of such election, stating the shareholder's name, address, the number, classes
and series of shares as to which the shareholder dissents, and a demand for
payment of the fair value of such shares ("Election Notice"), and deposit the
certificates representing the PSHC Common Stock with PSHC.
 
     Within the later to occur of 10 days following the expiration of the period
in which shareholders may file their Election Notices and 10 days after the
Merger is consummated (but in no case later than 90 days following the date the
PSHC shareholders approve the Merger Agreement), PSHC must make a written offer
to each shareholder who has properly filed an Election Notice to pay an amount
PSHC estimates to be a fair value for the shareholder's shares. This offer will
be accompanied by certain of PSHC's financial statements. If the Merger is not
consummated within 90 days following the date of approval of the Merger
Agreement, any offer to pay by PSHC to dissenting shareholders shall be
conditional upon consummation of the Merger. Any Shareholder who accepts such
offer within 30 days shall receive payment for the dissenting Shareholder's
shares within 90 days of such offer to pay or consummation of the Merger,
whichever is later.
 
     In the event that PSHC fails to make any payment offer within the time
period set forth above or any dissenting shareholder fails to accept such offer
within 30 days, and PSHC receives written demand for payment from any dissenting
shareholder within 60 days following the consummation of the Merger, PSHC must
institute proceedings in state circuit court in St. Lucie County, Florida (the
"Court") requesting that the fair value of such dissenting shareholder's shares
be determined. If PSHC fails to file such action, any dissenting shareholder
will have the right to file an action in such shareholder's own name for
determination as to the fair value of such shareholder's shares. All dissenting
shareholders who have not accepted payment offers by PSHC must be made a party
to such court action. The court may, in its discretion, appoint an appraiser to
receive evidence and recommend a decision on the question of fair value. The
judgment may, in the discretion of the Court, include a fair rate of interest.
Each dissenting shareholder will be entitled to
 
                                       30
<PAGE>   45
 
payment, as determined by the Court, within 10 days following final
determination by the court as to the fair value of such shareholder's stock.
 
     The Court will assess the costs and expenses of such proceeding (including
reasonable compensation for and the expenses of the appraiser, but excluding
fees and expenses of counsel and experts) against PSHC, except that the Court
may assess such costs and expenses as it deems appropriate against any or all of
the dissenting shareholders if it finds that their demand for additional payment
was arbitrary, vexatious or otherwise not in good faith. The Court may award
fees and expenses of counsel and experts in amounts the Court finds equitable
against PSHC if the fair value of the shares, as determined by the Court,
exceeds the amount which PSHC offered to pay or if PSHC failed to make an offer
to pay.
 
     THE FOREGOING SUMMARY OF THE APPLICABLE PROVISIONS OF SECTIONS 607.1301
THROUGH 607.1320 OF THE FBCA IS NOT INTENDED TO BE A COMPLETE STATEMENT OF SUCH
PROVISIONS, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH SECTIONS,
WHICH ARE REPRODUCED IN FULL AS APPENDIX IV HEREOF. THE PROVISIONS OF THE
STATUTES ARE TECHNICAL IN NATURE AND COMPLEX. IT IS SUGGESTED THAT ANY
SHAREHOLDER WHO DESIRES TO EXERCISE THE RIGHT TO OBJECT TO THE MERGER AGREEMENT
CONSULT HIS COUNSEL. FAILURE TO STRICTLY COMPLY WITH THE PROVISIONS OF THE
STATUTE MAY DEFEAT A SHAREHOLDER'S RIGHT TO DISSENT.
 
     Any dissenting PSHC shareholder who perfects such holder's right to be paid
the value of such holder's shares in cash under the foregoing procedures for
dissent and appraisal will recognize taxable gain or loss for federal income tax
purposes upon receipt of cash for such shares. See "-- Certain Federal Income
Tax Consequences."
 
CONDUCT OF BUSINESS PENDING THE MERGER
 
     Pursuant to the Merger Agreement, PSHC has agreed that unless the prior
written consent of Seacoast has been obtained, and except as otherwise expressly
contemplated in the Merger Agreement, PSHC will (i) operate its business only in
the usual, regular, and ordinary course and in a manner to preserve intact its
business organization and assets and maintain its rights and franchises, and
(ii) take no action which would (a) adversely affect the ability of any party to
obtain any consents required for the transactions contemplated by the Merger
Agreement without imposition of a condition or restriction of the type referred
to in the Merger Agreement or (b) adversely affect the ability of any party to
perform its covenants and agreements under the Merger Agreement. The Merger
Agreement also provides that except for certain prior commitments made by PSHC
not to exceed $212,000, all loans, leases or extensions of credit secured by
real property originated, purchased or funded in whole or in part by PSHC or its
subsidiaries, where the obligor thereon and the real property related thereto
are not both located in St. Lucie, Martin and/or Indian River Counties, Florida
(collectively, the "Counties") must conform to the Federal National Mortgage
Association ("FNMA") or Federal Home Loan Mortgage Corporation ("FHLMC")
seller/servicer guidelines applicable to such loans and shall be immediately
saleable to FNMA and/or FHLMC. PSHC and each of PSHC's subsidiaries also are
required to terminate and discontinue purchasing, funding or otherwise extending
credit or committing or agreeing to any of the foregoing with respect to any
loans, extensions of credit, leases and/or mortgages or any participations or
other interests therein from any wholesale mortgage business and/or any
affiliate of such wholesale mortgage business, except to meet PSNB's contractual
obligations under the existing commitments, and except to purchase and hold as
temporary investments, up to $2.5 million at any time of fully-approved Federal
Housing Administration and Veterans Administration loans at any time through
April 30, 1997.
 
     In addition, PSHC has agreed that, prior to the earlier of the Effective
Time or termination of the Merger Agreement, PSHC will not, except with the
prior written consent of the chief executive officer or chief financial officer
of Seacoast or as expressly contemplated or permitted by the Merger Agreement,
agree or commit to do, any of the following: (i) amend the Articles of
Incorporation, Bylaws, or other governing instruments of any PSHC company; (ii)
incur any additional debt obligation or other obligation for borrowed money
(other than indebtedness of a PSHC company to another PSHC company) in excess of
an aggregate of $50,000 (for the PSHC companies on a consolidated basis) except
in the ordinary course of business of the PSHC subsidiaries consistent with past
practices (which shall include, for PSHC subsidiaries that are depository
institutions, the creation of deposit liabilities, purchases of federal funds,
advances from the Federal
 
                                       31
<PAGE>   46
 
Home Loan Bank or the Federal Reserve Bank, and entry into repurchase agreements
fully secured by U.S. government or agency securities), or impose, or suffer the
imposition, on any asset of any PSHC company any lien or permit any such lien to
exist (other than in connection with deposits, repurchase agreements, bankers
acceptances, "treasury tax and loan" accounts established in the ordinary course
of business, the satisfaction of legal requirements in the exercise of trust
powers, and liens in effect as of the date of the Merger Agreement that were
previously disclosed to Seacoast by PSHC); (iii) repurchase, redeem, or
otherwise acquire or exchange (other than exchanges in the ordinary course under
employee benefit plans), directly or indirectly, any shares, or any securities
convertible into any shares, of the capital stock of any PSHC company, or
declare or pay any dividend or make any other distribution in respect of any
PSHC capital stock; (iv) except pursuant to the Merger Agreement, or pursuant to
the exercise of stock options outstanding as of the date of the Merger Agreement
and pursuant to the terms thereof in existence on the date of the Merger
Agreement, issue, sell, pledge, encumber, authorize the issuance of, enter into
any contract to issue, sell, pledge, encumber, or authorize the issuance of, or
otherwise permit to become outstanding, any additional shares of PSHC Common
Stock, or any other capital stock of any PSHC company, or any stock appreciation
rights, or any option, warrant, conversion, or other right to acquire any such
stock, or any security convertible into any such stock; (v) adjust, split,
combine, or reclassify any capital stock of any PSHC company or issue or
authorize the issuance of any other securities in respect of or in substitution
for shares of PSHC Common Stock or sell, lease, mortgage, or otherwise dispose
of or otherwise encumber any shares of capital stock of any PSHC subsidiary
(unless any such shares of stock are sold or otherwise transferred to another
PSHC company) or any assets having a book value in excess of $50,000 other than
in the ordinary course of business for reasonable and adequate consideration;
(vi) (1) except for purchases of U.S. Treasury securities or U.S. Government
agency securities, which in either case have maturities of one years or less,
purchase any securities or make any material investment, either by purchase of
stock or securities, contributions to capital, asset transfers, or purchase of
any assets, in any person other than a wholly owned PSHC subsidiary, or
otherwise acquire direct or indirect control over any person, other than in
connection with (a) foreclosures in the ordinary course of business, (b)
acquisitions of control by a depository institution subsidiary in its fiduciary
capacity, or (c) the creation of new wholly owned subsidiaries organized to
conduct or continue activities otherwise permitted by the Merger Agreement; (2)
make any new loans or extensions of credit or renew, extend or renegotiate any
existing loans or extensions of credit (a) with respect to properties or
businesses outside of the Counties or to borrowers whose principal residence is
outside of the Counties, (b) that are unsecured in excess of $100,000, or (c)
that are secured in excess of $250,000; (3) purchase or sell (except for sales
of single family residential first mortgage loans in the ordinary course of
PSHC's business for fair market value) any whole loans, leases, mortgages or any
loan participations or agented credits or other interest therein, (4) renew or
renegotiate any loans or credits that are on any watch list and/or are
classified or special mentioned or take any similar actions with respect to
collateral held with respect to debts previously contracted or other real estate
owned, except pursuant to safe and sound banking practices and with prior
disclosure to FNB; provided, however, that PSHC may, without the prior notice to
or written consent of FNB, renew or extend existing credits on substantially
similar terms and conditions as present at the time such credit was made or last
extended, renewed or modified, for a period not to exceed one year and at rates
not less than market rates for comparable credits and transactions and without
any release of any collateral except as any PSHC company is presently obligated
under existing written agreements kept as part of such PSHC company's official
records and further, provided, that if any PSHC company makes, extends, renews,
renegotiates, compromises or settles any loans or extensions of credit or
releases any collateral therefor that are subject to the prior disclosure to FNB
hereunder and FNB has objected thereto, the aggregate consideration to be paid
to holders of PSHC Common Stock and PSHC Warrants shall be reduced on a dollar
for dollar basis in an amount equal to all outstanding principal of, all accrued
but unpaid interest and other charges on such loan(s) as of the Closing Date,
(vii) grant any increase in compensation or benefits to the employees or
officers of any PSHC company except in accordance consistent with past practice
previously disclosed to Seacoast by PSHC or as required by law; pay any
severance or termination pay or any bonus other than pursuant to written
policies or written contracts in effect on the date of the Merger Agreement;
enter into or amend any severance agreements with officers of any PSHC company;
or grant any material increase in fees or other increases in compensation or
other benefits to directors of any PSHC company except in accordance with past
practice previously disclosed to Seacoast by PSHC; (viii) voluntarily accelerate
the vesting of any stock options or other stockbased compensation or
 
                                       32
<PAGE>   47
 
employee benefits; (ix) enter into or amend any employment contract between any
PSHC company and any person (unless such amendment is required by law) that the
PSHC company does not have the unconditional right to terminate without
liability (other than liability for services already rendered), at any time on
or after the Effective Time; (x) adopt any new employee benefit plan of any PSHC
company or terminate or withdraw from, or make any material change in or to any
existing employee benefit plans of any PSHC company other than any such change
that is required by law or that, in the opinion of counsel, is necessary or
advisable to maintain the tax qualified status of any such plan; or make any
distributions from such employee benefit plans, except as required by law, the
terms of such plans or consistent with past practice, (xi) make any significant
change in any tax or accounting methods or systems of internal accounting
controls, except as may be necessary to conform to changes in tax laws or
regulatory accounting requirements or generally accepted accounting principles;
(xii) commence any litigation other than in accordance with past practice or
settle any litigation involving any liability of any PSHC company for material
money damages or restrictions upon the operations of any PSHC company; or (xiii)
except in the ordinary course of business and expressly permitted by the Merger
Agreement, enter into, modify, amend or terminate any material contract
(including and loan contract with an unpaid balance or any contract for payments
exceeding $100,000), or waive, release compromise or assign any material rights
or claims.
 
     The Merger Agreement also provides that from the date of the Merger
Agreement until the earlier of the Effective Time or the termination of the
Merger Agreement, Seacoast covenants and agrees that it will (i) continue to
conduct its business and the business of its subsidiaries in a manner designed
in its reasonable judgment, to enhance the long-term value of the Seacoast
capital stock and the business prospects of the Seacoast companies, and to the
extent consistent therewith use all reasonable efforts to preserve intact the
Seacoast core businesses and goodwill with their respective employees and the
communities they serve, and (ii) take no action which would (a) materially
adversely affect the ability of any party to obtain any consents required for
the transactions contemplated by the Merger Agreement without imposition of a
condition or restriction of the type referred to in the Merger Agreement, or (b)
materially adversely affect the ability of any party to perform its covenants
and agreements under the Merger Agreement; provided, that any Seacoast company
may acquire any assets or other businesses or discontinue or dispose of any of
its assets or business if such action is, in the judgment of Seacoast, desirable
in the conduct of the business of Seacoast and its subsidiaries. Seacoast also
has agreed to not amend the Seacoast Articles of Incorporation or Bylaws in a
manner adverse to the holders of PSHC Common Stock as compared to the rights of
holders of Seacoast Common Stock generally as of the date of the Merger
Agreement.
 
MANAGEMENT AND OPERATIONS AFTER THE MERGER; INTEREST OF CERTAIN PERSONS IN THE
MERGER
 
     Seacoast will be the surviving corporation resulting from the Merger.
Following consummation of the Merger, PSNB will be merged into and with FNB,
leaving FNB as the sole banking subsidiary of Seacoast. The officers of Seacoast
in office immediately prior to the Effective Time shall continue to serve as
officers of Seacoast after the Effective Time. Subsequent to the consummation of
the Merger, Jeffrey S. Furst and Christopher E. Fogal, current directors of
PSHC, will become members of the Seacoast and FNB Board of Directors. J. Hal
Roberts, Jr., the current Chief Executive Officer of PSHC, will become an
executive officer of Seacoast and FNB. The following members of the PSHC Board
of Directors will become members of a newly created FNB Advisory Board of
Directors for St. Lucie County: Charles E. Bigge, Howard L. Bickford, Ellen J.
Guterl, Harold H. Goldman, Raymond L. Isenburg, Joe Marinaro, and George V.
Weston. For Information concerning the current directors and management of
Seacoast and compensation thereof. See "ELECTION OF DIRECTORS." For additional
information regarding the interests of certain persons in the Merger, see
"-- Interests of Certain Persons in the Merger." For a description of the
provisions of the Merger Agreement affecting the operations of PSHC and Seacoast
prior to the Effective Time, see "CONDUCT OF BUSINESS PENDING THE MERGER."
 
     Indemnification and Advancement of Expenses.  The Merger Agreement provides
that Seacoast will indemnify the present and former directors, officers,
employees, and agents of the PSHC companies against all liabilities arising out
of actions or omissions arising out of the indemnified party's service as a
director, officer, employee or agents of PSHC, or at PSHC's request, of another
corporation, partnership, joint venture, trust or
 
                                       33
<PAGE>   48
 
other enterprise occurring at or prior to the Effective Time to the full extent
permitted under Florida law and by PSHC's Articles of Incorporation or Bylaws,
as in effect on the date of the Merger Agreement, including provisions relating
to advances of expenses incurred in the defense of any litigation and whether or
not any Seacoast company is insured against any such matter. In any case in
which approval by Seacoast is required to effectuate any indemnification, at the
election of the indemnified party, the determination of any such approval will
be made by independent counsel mutually agreed upon between Seacoast and the
indemnified party.
 
     Director and Officer Insurance.  The Merger Agreement provides that
Seacoast shall, to the extent available, (and PSHC shall cooperate prior to the
Effective Time in these efforts) maintain in effect for a period of two years
after the Effective Time PSHC's existing directors' and officers' liability
insurance policy (provided that Seacoast may substitute therefor (i) policies of
at least the same coverage and amounts containing terms and conditions which are
substantially no less advantageous or (ii) with the consent of PSHC given prior
to the Effective Time, any other policy) with respect to claims arising from
facts or events which occurred prior to the Effective Time and covering persons
who are currently covered by such insurance. Seacoast shall not, however, be
obligated to make aggregate premium payments for such two-year period in respect
of such policy (or coverage replacing such policy) which exceed, for the portion
related to PSHC's directors and officers, 150% of the annual premium payments on
PSHC's current policy in effect as of the date of the Merger Agreement.
 
  Employment Agreement.
 
     Seacoast and FNB have entered into an employment agreement with J. Hal
Roberts, Jr., dated as of February 19, 1997, which will become effective at the
Effective Time (the "Roberts Agreement"). The terms of the Roberts Agreement are
substantially similar to the terms in Seacoast's other employment agreements
with executive officers. The Roberts Agreement has a three-year term and
provides for automatic renewal on an annual basis at the end of that term;
provided, however, that either Roberts, Seacoast or FNB may prevent such
automatic renewal by giving written notice to that effect not less than 90 days
prior to the end of the agreement's then current term.
 
     The Roberts Agreement provides for a base salary of $150,000, a grant of
stock options to purchase 9,000 shares of Seacoast Class A Stock at a per share
exercise price equal to the fair market value of a share of Seacoast Class A
Stock on the date of the grant, hospitalization insurance, long term disability
and life insurance in accordance with FNB's insurance plans for senior
management, and reasonable club dues. Roberts may also receive other
compensation including bonuses, and will be entitled to participate in all
current and future employee benefit plans and arrangements in which senior
management of FNB may participate.
 
     The Roberts Agreement provides for Mr. Roberts' termination for cause,
including willful and continued failure to perform the assigned duties, breach
of the fiduciary duties of loyalty and care to Seacoast and FNB, crimes
involving fraud, dishonesty or a breach of trust, breach of FNB's Code of
Ethics, commission of willful or negligent acts which cause material harm to
Seacoast or FNB, habitual absenteeism, alcoholism or other form of drug or other
addiction, and also upon Mr. Roberts' death or permanent disability. The Roberts
Agreement contains a change in control provision would allow Mr. Roberts to
terminate the contract within one year following the date of a "change of
control," as defined in the Roberts Agreement. A "change of control" includes
the acquisition of FNB or Seacoast in a merger, consolidation or similar
transaction, the acquisition of 51% or more of the voting power of any one or
all classes of Seacoast Common Stock, the sale of all or substantially all of
the assets of Seacoast or FNB, and certain other changes in share ownership.
Termination may also be permitted by Mr. Roberts in the event of a change in
duties and powers, customarily associated with the office designated in such
contract. Upon any such termination by Mr. Roberts following a change in control
or a change in duties and powers which are customarily associated with such
office, or an improper termination by Seacoast or FNB, Mr. Roberts' base salary,
hospitalization and other health and insurance benefits will continue for two
years.
 
     The Roberts Agreement provides that upon Mr. Roberts' death, FNB will
continue to pay Mr. Roberts' base salary and provide hospitalization insurance
and other such health insurance benefits that would have been provided to Mr.
Roberts' wife and eligible dependents at the date of his death. In the event
that Mr. Roberts becomes permanently disabled and is terminated, Mr. Roberts'
base salary, hospitalization and
 
                                       34
<PAGE>   49
 
other health and insurance benefits will continue to the extent that they are
not offset by amounts payable under FNB's long term disability plan.
 
     The non-competition clause in the Roberts Agreement provides that, during
the term of the Roberts Agreement and for a period of two years after the
termination of Mr. Roberts' employment, Mr. Roberts is prohibited from engaging
in the business of banking, fiduciary services, securities brokerage, investment
management or services, or lending or deposit taking within Martin, Indian
River, or St. Lucie Counties, Florida or any other county Seacoast conducts
business, on the date Mr. Roberts' employment is terminated. Mr. Roberts is also
prohibited from beneficially owning 5% or more of the outstanding capital stock
of any such business other than Seacoast or FNB, and from serving as an officer,
director, trustee or agent of an entity conducting any such business within
Martin, Indian River, or St. Lucie Counties, Florida or any other county
Seacoast conducts business on the date Mr. Roberts' employment is terminated.
The Roberts Agreement provides a non-solicitation clause prohibiting Mr. Roberts
from soliciting an employee to leave their employment with Seacoast or FNB for a
period of two years after Mr. Roberts' termination of employment. Pursuant to
the non-disclosure clause, Mr. Roberts may not disclose confidential information
and trade secrets of Seacoast, FNB, or their subsidiaries and affiliates.
 
     Officer Stock Options.  PSHC has granted stock options to certain of its
officers under the PSHC Stock Option Plan (the "PSHC Option Plan") with respect
to an aggregate of 50,820 shares of PSHC Common Stock. Options granted include
incentive stock options and non-qualified stock options which vest immediately
upon grant or in not more than ten years from the date of grant unless
accelerated in accordance with the PSHC Option Plan or individual option
agreement, including upon a change in control (as defined in the PSHC Option
Plan). Such stock options will be assumed by Seacoast in the Merger.
 
     Other Matters Relating to PSHC Employee Benefit Plans.  The Merger
Agreement also provides that, after the Effective Time, Seacoast will provide
generally to officers and employees of the PSHC companies employee benefits
under employee benefit and welfare plans (other than stock option or other plans
involving the potential issuance of Seacoast Common Stock), on terms and
conditions which when taken as a whole are substantially similar to those
currently provided by the Seacoast to its similarly situated officers and
employees. Seacoast has also agreed that for a period of 12 months after the
Effective Time, Seacoast will provide generally to officers and employees of the
PSHC companies severance benefits in accordance with the policies of either (i)
PSHC as previously disclosed to Seacoast, or (ii) Seacoast, whichever of (i) or
(ii) will provide the greater benefit to the officer or employee. Seacoast has
also agreed to waive any pre-existing condition exclusion under any employee
health plan for which any employees and/or officers and dependents covered by
PSHC plans as of the Effective Time shall become eligible by virtue of the
preceding sentence, to the extent (i) such pre-existing condition was covered
under the corresponding plan maintained by the PSHC company and (ii) the
individual affected by the pre-existing condition was covered by PSHC's
corresponding plan on the date which immediately precedes the Effective Time,
provided that PSHC has previously disclosed to Seacoast and confirms at the
Effective Time that none of PSHC's employees, officers or other participants or
their respective dependents, to the best of PSHC's and PSNB's knowledge and
belief, have any long-term disabilities or conditions, which in the reasonable
judgment of Seacoast would materially adversely affect the claims experience
and/or costs of any employee benefit plan or insurance maintained by or through
any Seacoast company.
 
     For purposes of participation, vesting and (except in the case of Seacoast
retirement plans) benefit accrual under Seacoast's employee benefit plans, the
service of the employees of the PSHC companies prior to the Effective Time shall
be treated as service with a Seacoast company participating in such employee
benefit plans. The Merger Agreement further provides that Seacoast will cause
the PSHC companies to honor, on terms reasonably agreed upon by Seacoast and
PSHC, all employment, severance, consulting, and other compensation contracts
disclosed to Seacoast between any PSHC company and any current or former
director, officer, or employee thereof, and all provisions for vested benefits
or other vested amounts earned or accrued through the Effective Time under the
PSHC benefit plans.
 
CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
     The following is a summary of certain anticipated federal income tax
consequences of the Merger. This summary is based on the federal income tax laws
as now in effect and as currently interpreted; it does not take
 
                                       35
<PAGE>   50
 
into account possible changes in such laws or interpretations, including
amendments to applicable statutes or regulations or changes in judicial or
administrative rulings, some of which may have retroactive effect. This summary
does not purport to address all aspects of the possible federal income tax
consequences of the Merger and is not intended as tax advice to any person. In
particular, and without limiting the foregoing, this summary does not address
the federal income tax consequences of the Merger to shareholders in light of
their particular circumstances or status (for example, as foreign persons,
tax-exempt entities, dealers in securities, insurance companies, and
corporations, among others). Nor does this summary address any consequences of
the Merger under any state, local, estate, or foreign tax laws. Shareholders,
therefore, are urged to consult their own tax advisors as to the specific tax
consequences to them of the Merger, including tax return reporting requirements,
the application and effect of federal, foreign, state, local, and other tax
laws, and the implications of any proposed changes in the tax laws.
 
     A federal income tax ruling with respect to this transaction was not
requested from the Internal Revenue Service ("IRS"). Instead, Alston & Bird LLP,
special tax counsel to Seacoast, has rendered an opinion to PSHC and Seacoast
concerning certain federal income tax consequences of the proposed Merger under
federal income tax law. It is such firm's opinion that, based upon the
assumption the Merger is consummated in accordance with the FBCA and in
conformity with the representations made by the management of PSHC and Seacoast,
the transaction will have the following federal income tax consequences:
 
          (a) The Merger will constitute a reorganization within the meaning of
     Section 368(a) of the Code.
 
          (b) No gain or loss will be recognized to the PSHC shareholders upon
     the receipt of Seacoast Class A Stock solely in exchange for their shares
     of PSHC Common Stock.
 
          (c) The basis of the Seacoast Class A Stock to be received by PSHC
     shareholders will be the same as the basis of the PSHC Common Stock
     surrendered in the exchange, less any basis attributable to fractional
     shares of Seacoast Class A Stock settled by cash payment.
 
          (d) The holding period of the Seacoast Class A Stock to be received by
     PSHC shareholders will include the holding period of the PSHC Common Stock
     surrendered in exchange therefor, provided that the PSHC Common Stock was
     held as a capital asset on the date of the exchange.
 
          (e) The payment of cash to a PSHC shareholder in lieu of issuing a
     fractional share interest in Seacoast will be treated for federal income
     tax purposes as if the fractional share was distributed as part of the
     exchange and then was redeemed by Seacoast. This cash payment will be
     treated as having been received as a distribution in full payment in
     exchange for the stock redeemed as provided in Section 302(a) of the Code.
     Generally, any gain or loss recognized upon such exchange will be capital
     gain or loss, provided the fractional share would constitute a capital
     asset in the hands of the exchanging shareholder.
 
          (f) The payment of cash in respect of shares of PSHC Common Stock as
     to which appraisal rights are perfected will be treated as distributions in
     full payment in exchange for such shares of PSHC Common Stock. Generally,
     any gain or loss recognized upon such exchange will be capital gain or
     loss, provided the shares of PSHC Common Stock constitute a capital asset
     in the hands of the exchanging shareholder.
 
     The tax opinion does not address the tax consequences of the exchange in
the Merger of PSHC Warrants for Seacoast Class A Common Stock. Under current
law, the tax consequences of such exchange are unclear. Existing Treasury
regulations state that warrants are not stock or securities for purposes of the
reorganization provisions of the Code. Although recently proposed regulations
would treat a warrant issued by a party to a reorganization as a security that
could be exchanged for stock in another party to the reorganization without the
recognition of gain or loss, those regulations are not proposed to be effective
until 60 days after the proposed regulations are adopted as final regulations.
Proposed regulations are not binding on the IRS, and may not be relied upon by a
taxpayer. Holders of PSHC Warrants should consult their own tax advisors with
respect to the possible tax consequences of the exchange of PSHC Warrants for
Seacoast Class A Common Stock in the Merger.
 
     BECAUSE CERTAIN TAX CONSEQUENCES OF THE MERGER MAY VARY DEPENDING UPON THE
PARTICULAR CIRCUMSTANCES OF EACH SHAREHOLDER AND OTHER CIR-
 
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<PAGE>   51
 
CUMSTANCES, AND BECAUSE BASED ON EXISTING BINDING AUTHORITIES, THE EXCHANGE OF
WARRANTS MAY NOT BE TREATED THE SAME AS THE EXCHANGE OF STOCK BY STOCKHOLDERS,
EACH HOLDER OF PSHC COMMON STOCK OR PSHC WARRANTS IS URGED TO CONSULT SUCH
HOLDER'S OWN TAX ADVISORS TO DETERMINE THE PARTICULAR TAX CONSEQUENCES TO SUCH
HOLDER OF THE MERGER (INCLUDING THE APPLICATION AND EFFECT OF STATE, LOCAL AND
FOREIGN INCOME AND OTHER TAX LAWS).
 
ACCOUNTING TREATMENT
 
     It is anticipated that the Merger will be accounted for as a
pooling-of-interests. Under the pooling-of-interests method of accounting, the
recorded amounts of the assets and liabilities of PSHC will be carried forward
at their previously recorded amounts.
 
     In order for the Merger to qualify for pooling-of-interests accounting
treatment, substantially all (90% or more) of the outstanding PSHC Common Stock
must be exchanged for Seacoast Class A Stock with substantially similar terms.
There are certain other criteria that must be satisfied in order for the Merger
to qualify as a pooling-of-interests, some of which criteria cannot be satisfied
until after the Effective Time.
 
     For information concerning certain conditions to be imposed on the exchange
of PSHC Common Stock for Seacoast Class A Stock in the Merger by affiliates of
PSHC and certain restrictions to be imposed on the transferability of the
Seacoast Class A Stock received by those affiliates in the Merger in order,
among other things, to ensure the availability of pooling-of-interests
accounting treatment, see "-- Resales of Seacoast Class A Stock."
 
EXPENSES AND FEES
 
     The Merger Agreement provides, in general, that each of the parties will
bear and pay its own expenses in connection with the transactions contemplated
by the Merger Agreement, including fees and expenses of its own financial or
other consultants, investment bankers, accountants, and counsel, except that
each of Seacoast and PSHC will bear and pay one-half of the printing costs in
connection with the Registration Statement and this Joint Proxy Statement.
 
RESALES OF SEACOAST CLASS A STOCK
 
     Seacoast Class A Stock to be issued to shareholders of PSHC and holders of
PSHC Warrants in connection with the Merger will be registered under the
Securities Act. All shares of Seacoast Class A Stock received by holders of PSHC
Common Stock and PSHC Warrants, and all shares of Seacoast Class A Stock issued
and outstanding immediately prior to the Effective Time, upon consummation of
the Merger will be freely transferable by those shareholders of PSHC and
Seacoast not deemed to be "Affiliates" of PSHC or Seacoast. "Affiliates"
generally are defined as persons or entities who control, are controlled by, or
are under common control with PSHC or Seacoast at the time of the Meetings
(generally, executive officers and directors).
 
     Rules 144 and 145 promulgated under the Securities Act restrict the sale of
Seacoast Class A Stock received in the Merger by Affiliates and certain of their
family members and related interests. Generally speaking, during the one-year
period following the Effective Time, Affiliates of PSHC or Seacoast may resell
publicly the Seacoast Class A Stock received by them in the Merger within
certain limitations as to the amount of Seacoast Class A Stock sold in any
three-month period and as to the manner of sale. After this one-year period,
such Affiliates of PSHC who are not Affiliates of Seacoast may resell their
shares without restriction. This Joint Proxy Statement does not cover any
resales of Seacoast Class A Stock received by persons who may be deemed to be
Affiliates of PSHC or Seacoast.
 
     PSHC has agreed to use its reasonable efforts to cause each person who may
be deemed to be an Affiliate of PSHC to execute and deliver to Seacoast prior to
the Effective Time, an agreement (each, an "Affiliate Agreement") providing that
such Affiliate will not sell, pledge, transfer, or otherwise dispose of any
Seacoast Class A Stock obtained as a result of the Merger (i) except in
compliance with the Securities Act and the rules and regulations of the SEC
thereunder and (ii) in any case, until after results covering 30 days of post-
 
                                       37
<PAGE>   52
 
Merger operations of Seacoast have been published. The receipt of these
Affiliate Agreements by Seacoast is also a condition to Seacoast's obligation to
consummate the Merger. Certificates representing shares of PSHC Common Stock
surrendered for exchange by any person who is an Affiliate of PSHC for purposes
of Rule 145(c) under the Securities Act shall not be exchanged for certificates
representing shares of Seacoast Class A Stock until Seacoast has received such a
written agreement from such person. Prior to publication of such results,
Seacoast will not transfer on its books any shares of Seacoast Class A Stock
received by an Affiliate pursuant to the Merger. The stock certificates
representing Seacoast Class A Stock issued to Affiliates in the Merger may bear
a legend summarizing the foregoing restrictions. See "Conditions to Consummation
of the Merger."
 
                 EFFECT OF THE MERGER ON RIGHTS OF SHAREHOLDERS
 
     As a result of the Merger, holders of PSHC Common Stock will be exchanging
their shares of a Florida corporation governed by the FBCA and PSHC's Articles
of Incorporation (the "PSHC Articles") and Bylaws, for shares of Class A Stock
of Seacoast, a Florida corporation governed by the FBCA and Seacoast's Articles
of Incorporation (the "Seacoast Articles") and Bylaws. Certain significant
differences exist between the rights of PSHC shareholders and those of Seacoast
shareholders. The differences deemed material by PSHC and Seacoast are
summarized below. The following discussion is necessarily general; it is not
intended to be a complete statement of all differences affecting the rights of
shareholders, and their respective entities, and it is qualified in its entirety
by reference to the FBCA as well as to Seacoast's Articles and Bylaws and PSHC's
Articles and Bylaws.
 
AUTHORIZED CAPITAL STOCK
 
     Seacoast.  The Seacoast Articles authorize the issuance of two classes of
common stock, Class A Stock and Class B Stock. Seacoast is authorized to issue
an aggregate of 10,000,000 shares of Class A Stock, $.10 par value, of which
          shares were issued as of the Seacoast Record Date, and 810,000 shares
of Class B Stock, $.10 par value, of which           shares were issued, as of
the Seacoast Record Date. The Seacoast Articles also authorize the issuance in
one or more series of not more than 1,000,000 shares of preferred stock, $1.00
par value ("Seacoast Preferred Stock") with rights, preferences, liquidation
value, dividend rate, conversions rights and other terms to be designated in one
or more distinctive series by the Seacoast Board of Directors at the time of
such issuance.
 
     Unless otherwise required by law or the Seacoast Articles, Seacoast Class A
Stock and Class B Stock vote together as a single class on all matters presented
to Seacoast shareholders. Each share of Seacoast Class A Stock is entitled to
one vote for all purposes. Each share of Class B Stock is entitled to 10 votes
for all purposes. No cash dividend may be declared or paid on shares of Class B
Stock unless, simultaneously therewith or prior thereto, there is or has been
declared or paid (as the case may be) a cash dividend on the shares of Seacoast
Class A Stock of at least 110% of the cash dividend on the shares of Class B
Stock. A dividend payable in shares of Seacoast Class A Stock shall also be paid
to holders of Class B Stock at the same time and on the same basis that such
dividend is payable to the holders of Seacoast Class A Stock.
 
     In any liquidation or dissolution of the corporation, the holders of the
Seacoast Class A Stock shall be entitled to receive, out of the assets available
for distribution to holders of Seacoast Common Stock, an amount equal to $2.50
per share before any amount shall be paid to holders of the Class B Stock. After
such preference amount has been paid to the holders of the Seacoast Class A
Stock, the holders of Class B Stock shall then be entitled to next receive, out
of the assets available for distribution to the holders of Seacoast Class A
Stock, a like amount per share. Thereafter, holders of Seacoast Class A Stock
and Class B Stock shall be entitled to participate, pro rata in accordance with
the number of shares owned by them, in the distribution of Seacoast's remaining
assets.
 
     Each share of Class B Stock shall have an unlimited right of conversion to
one share of Seacoast Class A Stock; provided, however, that such right of
conversion shall not be available to Class B Stock subsequent to the approval of
a liquidation or dissolution of Seacoast by Seacoast shareholders.
 
                                       38
<PAGE>   53
 
     Seacoast's Board of Directors may authorize the issuance of authorized but
unissued shares of Seacoast Class A Stock and Class B Stock without further
action by Seacoast's shareholders, unless such action is required in a
particular case by applicable laws or regulations or by any stock exchange upon
which Seacoast's capital stock may be listed. Seacoast's shareholders do not
have the preemptive right to purchase or subscribe to any unissued authorized
shares of Seacoast Class A Stock, Class B Stock or Seacoast Preferred Stock or
any option or warrant for the purchase thereof.
 
     The authority to issue additional shares of Seacoast Common Stock provides
Seacoast with the flexibility necessary to meet its future needs without the
delay resulting from seeking shareholder approval. The authorized but unissued
shares of Seacoast Common Stock will be issuable from time to time for any
corporate purpose, including, without limitation, stock splits, stock dividends,
employee benefit and compensation plans, acquisitions, and public or private
sales for cash as a means of raising capital. Such shares could be used to
dilute the stock ownership of persons seeking to obtain control of Seacoast. In
addition, the sale of a substantial number of shares of Seacoast Common Stock,
particularly Class B Stock, to persons who have an understanding with Seacoast
concerning the voting of such shares, or the distribution or declaration of a
dividend of shares of Seacoast Common Stock (or the right to receive Seacoast
Common Stock) to Seacoast shareholders, may have the effect of discouraging or
increasing the cost of unsolicited attempts to acquire control of Seacoast.
 
     PSHC.  PSHC's authorized capital stock consists of 10,000,000 shares of
PSHC Common Stock, $.01 par value, of which        shares were issued as of the
PSHC Record Date. PSHC's shareholders do not have the preemptive right to
purchase or subscribe to any unissued authorized shares of PSHC Common Stock or
any option or warrant for the purchase thereof. In addition, shares of PSHC
Common Stock can be issued by authorization of the Board of Directors of PSHC
without the approval of the shareholders, except in certain instances prescribed
by the FBCA.
 
     The Board of Directors of PSHC may, from time to time, declare and pay
dividends, but only to the extent that such dividends are declared and paid from
PSHC's unreserved and unrestricted earned surplus. The amount per share paid as
a dividend out of capital surplus shall be disclosed to the shareholders.
Dividends may be paid on any authorized but unissued shares of PSHC stock,
provided that certain adjustments provided in the PSHC Bylaws are made with
regard to PSHC's stated capital at the time of issuance of such shares.
 
AMENDMENT OF ARTICLES OF INCORPORATION AND BYLAWS
 
     Seacoast.  The Seacoast Articles provide that the Seacoast Articles may be
amended as provided by law. The FBCA generally provides that the approval of a
corporation's board of directors and the affirmative vote of a majority of (i)
all shares entitled to vote thereon and (ii) the shares of each class of stock
entitled to vote thereon as a class, is required to amend a corporation's
Articles of Incorporation, unless the Articles specify a greater voting
requirement. The Seacoast Articles also provide that the provisions regarding
the approval required for certain business combinations may only be changed by
the affirmative vote of (i) the holders of at least two-thirds of all of the
shares of Seacoast Class A Stock outstanding and entitled to vote, voting as a
separate class and (ii) the holders of shares with at least two-thirds of all
votes entitled to be cast by all shares of Seacoast Common Stock (Class A Stock
and Class B Stock) outstanding, voting together as a single class.
 
     The Seacoast Articles also provides that the Bylaws may be made, altered or
rescinded by a two-thirds majority vote of the Seacoast Directors. Neither the
Seacoast Articles or Bylaws expressly permit the Seacoast shareholders to make,
alter or rescind any Bylaws.
 
     PSHC.  The FBCA generally provides that, unless a corporation's articles of
incorporation specify a greater voting requirement, the corporation's articles
of incorporation may not be amended unless (i) the Board of Directors recommends
the amendment to the shareholders (unless the Board elects to make no
recommendation and communicates the basis for its election to the shareholders)
and (ii) the amendment is adopted by a majority of the votes entitled to be cast
on the amendment by each voting group entitled to vote thereon. Amendments to
the PSHC Articles may be made in accordance with the FBCA, except that a special
vote is required to amend the provisions regarding the approval of certain
business combinations, the
 
                                       39
<PAGE>   54
 
removal of directors, and any amendments made to the amendment provision itself.
In such cases, the affirmative vote of the holders of at least seventy-five
percent (75%) of the PSHC shares of capital stock outstanding and entitled to
vote is required for approval.
 
     The effect of PSHC's more stringent voting requirement for the amendment of
those PSHC Articles relating to business consolidations and the removal of
directors is that PSHC shareholders possess a greater ability to prevent the
amendment of such provisions than do the shareholders of Seacoast. Conversely,
Seacoast shareholders are afforded more latitude in amending the provisions in
the Seacoast Articles relating to business consolidations and the removal of
directors than are the shareholders of PSHC with regard to the PSHC Articles.
 
     In general, PSHC's Bylaws may be amended by its shareholders or by a
majority of the full Board of Directors at a regular Board meeting.
 
CLASSIFIED BOARD OF DIRECTORS AND ABSENCE OF CUMULATIVE VOTING
 
     Seacoast.  Seacoast's Bylaws generally provide that the number of directors
constituting the Seacoast Board shall be not less than five nor more than 14, as
fixed from time to time by resolution of Seacoast's Board of Directors.
Currently the number of directors is fixed at 10. Unlike the PSHC Board, the
Seacoast Board is not classified. Seacoast shareholders do not have cumulative
voting rights with respect to the election of directors. All elections for
directors are decided by a plurality vote.
 
     PSHC.  The PSHC Articles provide that PSHC's Board of Directors is divided
into three classes, with each class to be as nearly equal in number as possible.
The number of directors is determined by the Board of Directors from time to
time, but in no event shall the Board have less than five directors nor more
than 11 directors. The directors in each class serve three-year terms of office.
The effect of PSHC having a classified Board of Directors is that only
approximately one-third of the members of the Board are elected each year, which
effectively requires two annual meetings for PSHC's shareholders to change a
majority of the members of the Board. The PSHC Bylaws provide that in the event
of a vacancy on the PSHC Board of Directors, including any vacancy created by
reason of an increase in the number of directors, may be filled by the
affirmative vote of a majority of the remaining directors through less than a
quorum of the PSHC Board of Directors. In general, the election of directors by
PSHC shareholders is in accordance with the FBCA, which provides that the
elections for directors are determined by a plurality vote.
 
REMOVAL OF DIRECTORS
 
     Seacoast.  Under the Seacoast Bylaws, any director or the entire Board of
Directors may be removed for cause by the vote of the shareholders or by action
of the Board of Directors. Seacoast directors may be removed without cause only
by the vote of the shareholders.
 
     PSHC.  The PSHC Bylaws provide that directors of PSHC may be removed by the
shareholders at any time for cause, in accordance with the FBCA. The removal of
PSHC directors without cause requires the affirmative vote of at least
seventy-five percent (75%) of the outstanding shares of capital stock of PSHC
entitled to vote in the election of directors.
 
     The PSHC shareholders face a more restrictive voting requirement to remove
PSHC officers than Seacoast shareholders do with respect to Seacoast officers.
The effect of this difference in voting requirements is that the directors of
PSHC are afforded greater protection against their removal by the vote of the
PSHC shareholders than are the directors of Seacoast.
 
INDEMNIFICATION
 
     Seacoast.  The Seacoast Bylaws generally provide that a director is
indemnified against liability and other expenses incurred in a proceeding by
reason of the fact he is a director, in accordance with Section 607.0850 of the
FBCA. Directors are indemnified against all expenses arising from the proceeding
except in cases where the director's actions were material to the cause of
action and constituted a violation of criminal law, a transaction from which the
director derived an improper gain, a willful misconduct or
 
                                       40
<PAGE>   55
 
conscious disregard for the best interests of Seacoast, or certain enumerated
violations contained in Section 607.0834 of the FBCA. Seacoast's Bylaws provide
for the advancement of expenses to its directors at the outset of a proceeding,
the purchase of insurance by Seacoast against any liability of the director, and
the survival of such indemnification to the director's heirs. The
indemnification provisions are non-exclusive, and shall not impair any other
rights to which those seeking indemnification or advancement of expenses may be
entitled.
 
     PSHC.  The provisions in the PSHC Bylaws relating to indemnification are
substantially the same as those found in the Seacoast Bylaws. The PSHC Bylaws
provide that PSHC shall indemnify its directors to the fullest extent permitted
by law, and, in the event that any portion of such provisions are deemed
invalid, directors will nonetheless be indemnified to the fullest extent of the
remaining provisions and any applicable provision of Florida law.
 
     The PSHC Bylaws contain an express provision that entitles directors to
partial indemnification against liability and other expenses in the case that
such director is not entitled to full indemnification. In the case that a
director is denied indemnification for failure to satisfy the conditions of the
PSHC Bylaws, such director may apply for indemnification or other expenses to a
court. The PSHC Bylaws direct the court in its determination to award
indemnification only if the court finds that (i) the director is entitled to
indemnification under the provisions of the PSHC Bylaws, or (ii) the director is
fairly and reasonably entitled to indemnification or expenses in view of all
reasonable circumstances, regardless of whether such director met the applicable
standards of conduct set forth in the PSHC Bylaws. The PSHC Bylaws also contain
a provision that explicitly reduces the amount of indemnification to be extended
to a director by any amounts such person may collect under any policy of
insurance purchased on his behalf by PSHC or from any other entity for whom the
director has served at the request of PSHC.
 
     In both the Bylaws of Seacoast and the Bylaws of PSHC, shareholders are
entitled to notification of any indemnification paid to the directors.
 
     The FBCA provides exculpation from certain liabilities for monetary damages
for directors, which provisions are applicable to both Seacoast and PSHC.
 
SPECIAL MEETINGS OF SHAREHOLDERS
 
     Seacoast.  Seacoast's Bylaws provide that such meetings may be called at
any time by either the President or a majority of the Board of Directors of
Seacoast. In addition, the President of Seacoast is required to call a special
meeting at the request of the holders of not less than ten percent of all votes
entitled to be cast by all shares of Seacoast Common Stock outstanding, voting
together as a single class.
 
     PSHC.  The PSHC Bylaws provide that special meetings may be called at any
time, but only by the President or the Board of Directors of PSHC. The President
or the Board of Directors is required to call a special meeting when requested
in writing by the holders of not less than ten percent of all the shares
entitled to vote at the meeting.
 
ACTIONS BY SHAREHOLDERS WITHOUT A MEETING
 
     Seacoast.  The Seacoast Articles and Bylaws are silent on whether action
required or permitted to be taken by Seacoast shareholders must be effected at a
duly called meeting of shareholders or whether such action may be effected by
any written consent by the shareholders. Section 607.0704 of the FBCA provides
that, unless otherwise provided in the articles of incorporation, action
required or permitted by the FBCA to be taken at an annual or special meeting
may be taken without a meeting, without prior notice, and without a vote if the
action is taken by the holders of the minimum number of votes with respect to
each voting group that would be necessary to authorize such action at a meeting.
The action must be evidenced by the written consent of such shareholders. Within
ten days after obtaining such authorization by written consent, notice must be
given to those shareholders who have not consented in writing or who are not
entitled to vote on the action.
 
                                       41
<PAGE>   56
 
     The provisions of the FBCA do not affect the special voting requirements
contained in the Seacoast Bylaws for the approval of a business combination or
the amendment of such provision. The approval of a business combination or of an
amendment to the provision which sets forth the voting requirements of such
combinations requires the affirmative vote of the holders of two-thirds of all
shares of Seacoast Class A Common Stock outstanding and entitled to vote, voting
as a separate class, and the affirmative vote of the holders of shares with
two-thirds of all the votes entitled to be cast by all shares of Seacoast Common
Stock outstanding, voting together as a single class.
 
     PSHC.  The PSHC Articles and Bylaws are similarly silent as to the means by
which shareholders may, by written consent, effectuate actions required or
permitted to be taken at a meeting. Accordingly, PSHC shareholders may act
without a meeting by satisfying the requirements of Section 607.0704 of the FBCA
in the same manner as Seacoast shareholders. The special voting provisions
contained in the PSHC Articles and Bylaws, requiring the affirmative vote of the
holders of at least seventy-five percent of the outstanding shares of PSHC
capital stock for the approval of business combinations, the removal of
directors, and the amendment of the provisions relating to such actions, are
unaffected by the FBCA. Actions undertaken by written consent of the
shareholders of PSHC under Section 607.0704 of the FBCA must satisfy the voting
requirements of the PSHC Articles and Bylaws.
 
MERGERS, CONSOLIDATIONS, AND SALES OF ASSETS
 
     Seacoast.  The Seacoast Articles require the affirmative vote of the
holders of at least two-thirds of all the shares of Class A Common Stock
outstanding and entitled to vote, voting as a separate class, and the
affirmative vote of the holders of shares with two-thirds of all the votes
entitled to be cast by all shares of Seacoast Common Stock outstanding, voting
together as a single class, to approve (i) a business combination, (ii) any
share exchange in which a person or entity acquires Seacoast stock pursuant to a
vote of shareholders, (iii) any sale, lease, or other disposition of all or
substantially all of Seacoast's assets, or (iv) any other transaction that has
an effect similar to the foregoing transactions.
 
     The provisions of the Seacoast Articles governing the approval of business
combinations, share exchanges, or dispositions of assets are different in their
nature and effect from the corresponding provisions contained in the PSHC
Articles (as described below). The Seacoast Articles focus solely on the nature
of the transaction and require that a more stringent voting provision be applied
to those transactions set forth in the Articles. Conversely, the PSHC Articles
focus on both the nature of the transaction and the identity of the person or
entity involved in the transaction. Specifically, the PSHC Articles are silent
as to business combinations, and sales, leases, or other dispositions of assets
other than in the regular course of business, that are consummated with persons
or entities whose beneficial ownership of PSHC capital stock represents less
than five percent of the outstanding capital stock of PSHC. For such
transactions, the provisions governing the approval of the shareholders and the
Board of Directors are found in the FBCA. However, if the other person or entity
involved with PSHC in such transactions beneficially owns five percent or more
of the outstanding capital stock of PSHC, the provisions of the PSHC Articles
are triggered, requiring that the approval of such transactions by PSHC
shareholders be subject to special voting provisions.
 
     PSHC.  In the event that PSHC undertakes (i) any business combination, (ii)
any sale, lease, or other disposition of all or substantially all of its assets,
(iii) any issuance or transfer of PSHC securities in exchange for assets or
securities with an aggregate fair market value of five percent or more of the
total assets of PSHC, or (iv) any issuance or transfer by PSHC of any of its
securities for cash, and such transactions involve another person or entity
beneficially owning five percent or more of the outstanding shares of PSHC's
capital stock entitled to vote in the election of directors ("5% Owner"), then
the PSHC Articles provide that the affirmative vote of the holders of at least
seventy-five percent (75%) of the outstanding shares of the capital stock of
PSHC entitled to vote in the election of directors is required to authorize such
transactions. A person or entity is deemed to beneficially own shares of stock
(i) which it has the right to acquire pursuant to warrants, options, or
otherwise, (ii) which are beneficially owned by its Associate or Affiliate, as
those terms are defined in Rule 12b-2 of the General Rules and Regulations under
the Securities Exchange Act of 1934, as
 
                                       42
<PAGE>   57
 
amended, or (iii) which are beneficially owned by a third party with which it
has an agreement to hold or acquire PSHC capital stock.
 
     This provision of the PSHC Articles does not apply to such transactions if
the PSHC Board of Directors has approved a memorandum of understanding with
respect to the transaction prior to the time that such other person or entity
becomes a 5% Owner, or such transactions if at any time prior to its
consummation the transaction has been approved by a resolution adopted by a
majority of directors unaffiliated with the 5% Owner. The Board of Directors of
PSHC has the power and duty to determine whether (i) a person or entity is a 5%
Owner, (ii) a sale or lease of assets constitutes substantially all of PSHC's
assets, and (iii) the memorandum of understanding is consistent with the
transaction to which it relates.
 
     Except as provided above, any other business combination requires that
PSHC's Board of Directors must recommend the transaction to the shareholders and
that the combination must be approved by a majority vote.
 
SHAREHOLDERS' RIGHTS TO EXAMINE BOOKS AND RECORDS
 
     Seacoast.  The Seacoast Articles and Bylaws are silent with respect to the
shareholders' rights to examine books and records. In the absence of such a
provision, the FBCA provides that a shareholder may inspect books and records
upon written demand at least five days before the date on which he wishes to
inspect such records. Such inspection is to occur during regular business hours
at Seacoast's principal office. Seacoast may deny any demand for inspection if
the demand was made for an improper purpose, which means a purpose not
reasonably related to such person's interest as a shareholder.
 
     PSHC.  The PSHC Bylaws provide that shareholders may inspect at any
reasonable time for any proper purpose the records and books of PSHC if such
shareholder (i) has been a holder of record of shares or voting trust
certificates totaling one-quarter of one percent of the outstanding shares of
PSHC capital stock for a period of at least six months prior to his demand, or
(ii) is the holder of at least five percent of the outstanding shares of PSHC
capital stock at the time of his demand.
 
DIVIDENDS
 
     Seacoast.  The Seacoast Articles provide that no cash dividend may be
declared or paid on shares of Seacoast Class B Stock unless, simultaneously
therewith or prior thereto, there is or has been declared or paid a cash
dividend on the shares of Seacoast Class A Stock of at least 110% of the cash
dividend on the shares of Class B Stock. A dividend payable in shares of
Seacoast Class A Stock shall also be paid to holders of Class B Stock at the
same time and on the same basis that such dividend is payable to the holders of
Seacoast Class A Stock.
 
     Because Seacoast Class A Stock is entitled to a dividend preference, the
rights of shareholders of PSHC will not be compromised with respect to the
Seacoast shareholders of Class B Stock as a result of the Merger.
 
     PSHC.  The Board of Directors of PSHC may, from time to time, declare and
pay dividends, but only to the extent that such dividends are declared and paid
from PSHC's unreserved and unrestricted earned surplus. The amount per share
paid as a dividend out of capital surplus shall be disclosed to the
shareholders. Dividends may be paid on any authorized but unissued shares of
PSHC stock, provided that certain adjustments provided in the PSHC Bylaws are
made with regard to PSHC's stated capital at the time of issuance of such
shares.
 
                                       43
<PAGE>   58
 
                    COMPARATIVE MARKET PRICES AND DIVIDENDS
 
  Seacoast
 
     Seacoast Class A Stock is traded in the over-the-counter market and is
quoted on The Nasdaq Stock Market's National Market ("Nasdaq National Market")
under the symbol "SBCFA". The following table sets forth the high and low sale
prices per share of Seacoast Class A Stock on the Nasdaq National Market and the
dividends paid per share of Seacoast Class A Stock for the indicated periods.
 
<TABLE>
<CAPTION>
                                                            SALE PRICE PER
                                                               SHARE OF
                                                           SEACOAST CLASS A
                                                                STOCK         ANNUAL DIVIDENDS DECLARED
                                                           ----------------         PER SHARE OF
                                                            HIGH      LOW      SEACOAST CLASS A STOCK
                                                           ------   -------   -------------------------
<S>                                                        <C>      <C>       <C>
1995
First Quarter............................................   19.25    16.25              $0.13
Second Quarter...........................................   19.50    17.75               0.13
Third Quarter............................................   22.50    18.00               0.13
Fourth Quarter...........................................   25.25    21.625              0.15
1996
First Quarter............................................   22.75    20.25               0.15
Second Quarter...........................................   22.75    21.00               0.15
Third Quarter............................................   24.00    21.75               0.15
Fourth Quarter...........................................   26.50    23.25               0.20
1997
First Quarter (through           , 1997).................                                0.20
</TABLE>
 
     On February 18, 1997, the last day prior to public announcement that
Seacoast and PSHC had executed the Merger Agreement, the last reported sale
price per share of Seacoast Class A Stock on the Nasdaq National Market was
$28.75, and the resulting equivalent pro forma price per share of PSHC Common
Stock was $28.66. On             , 1997, the last reported sale price per share
of Seacoast Class A Stock on the Nasdaq National Market was $          , and the
resulting equivalent pro forma price per share of PSHC Common Stock was
$          . The equivalent per share price of a share of PSHC Common Stock at
each specified date represents the closing sale price of a share of Seacoast
Class A Stock on such date multiplied by the Estimated Stock Exchange Ratio.
 
                                       44
<PAGE>   59
 
     There is no established public trading market for the PSHC Common Stock,
and no reliable information is available as to trades of such shares or the
prices at which such shares have traded. Based upon the limited information
available to it, PSHC believes that the following table sets forth the high and
low prices paid for PSHC Common Stock for the past two years. PSHC has not
declared or paid a cash dividend on PSHC Common Stock since March 1, 1994. The
price ranges have been adjusted to reflect a 10% stock dividend paid on PSHC
Common Stock paid by PSHC on February 16, 1995 and February 16, 1996.
 
<TABLE>
<CAPTION>
                                                                 SALE PRICE
                                                                PER SHARE OF
                                                              PSHC COMMON STOCK
                                                              -----------------
                                                               HIGH       LOW
                                                              ------     ------
<S>                                                           <C>        <C>
1995
- ------------------------------------------------------------
First Quarter...............................................  $14.00     $14.00
Second Quarter..............................................   15.00      14.25
Third Quarter...............................................   16.00      16.00
Fourth Quarter..............................................   17.00      16.00
1996
- ------------------------------------------------------------
First Quarter...............................................  $21.00     $17.00
Second Quarter..............................................   22.00      21.00
Third Quarter...............................................   22.00      22.00
Fourth Quarter..............................................   23.00      22.00
1997
- ------------------------------------------------------------
First Quarter (through March 17, 1997)......................  $23.00     $23.00
</TABLE>
 
     To PSHC's knowledge, the most recent trade of PSHC Common Stock prior to
February 18, 1997, the last day prior to public announcement that Seacoast and
PSHC had executed the Merger Agreement, was 302 shares at $23.00 per share. To
the knowledge of PSHC, there have been no trades since the announcement of the
Merger. PSHC has not declared or paid cash dividends on PSHC Common Stock since
March 1, 1994.
 
     The foregoing information regarding PSHC Common Stock is provided for
informational purposes only and, due to the absence of an active market for
PSHC's shares, should not be viewed as indicative of the actual or market value
of PSHC Common Stock.
 
     The holders of Seacoast Common Stock are entitled to receive dividends when
and if declared by the Board of Directors out of funds legally available
therefor. Seacoast has paid regular quarterly cash dividends on its Class A
Stock since 19  and its Class B Stock since 19     . Although Seacoast currently
intends to continue to pay quarterly cash dividends on the Seacoast Class A
Stock, the declaration and payment of dividends in the future will depend upon
business conditions, operating results, capital and reserve requirements, and
the Board of Directors' consideration of other relevant factors. PSHC has
agreed, consistent with its recent practices, not to declare or pay any
dividends during the pendency of the Merger. See "DESCRIPTION OF THE
MERGER -- Conduct of the Business Pending the Merger."
 
     Seacoast and PSHC are each legal entities separate and distinct from their
respective subsidiaries and their revenues depend in significant part on the
payment of dividends from their respective subsidiary depository institutions.
National banks, such as FNB and PSNB are subject to certain legal restrictions
on the amount of dividends they are permitted to pay. See "SUPERVISION AND
REGULATION -- Payment of Dividends."
 
                                       45
<PAGE>   60
 
                                BUSINESS OF PSHC
 
GENERAL
 
     PSHC is a bank holding company headquartered in Port St. Lucie, Florida.
PSNB, PSHC's wholly-owned subsidiary, operates three banking offices of in
Florida. As of December 31, 1996, PSHC had total consolidated assets of
approximately $130 million, total consolidated deposits of approximately $119
million, and total consolidated shareholders' equity of approximately $10
million. Through its banking subsidiary, PSNB, and its wholly-owned subsidiary,
Spirit Mortgage Corp., PSHC offers a broad range of banking and banking-related
services.
 
     PSHC was organized under the laws of the State of Florida and commenced
operations in 1989 with the acquisition of PSNB. Additional information with
respect to PSHC and its subsidiaries is included in documents incorporated by
reference in this Joint Proxy Statement. PSHC's principal executive offices are
located at 1100 S.W. St. Lucie West Boulevard, Port St. Lucie, Florida 34986,
and its telephone number at such address is (561) 340-2242. See "AVAILABLE
INFORMATION" and "DOCUMENTS INCORPORATED BY REFERENCE."
 
                              BUSINESS OF SEACOAST
 
GENERAL
 
     Seacoast is a bank holding company headquartered in Stuart, Florida with
approximately 19 banking offices in Florida. As of December 31, 1996, Seacoast
had total consolidated assets of approximately $808 million, total consolidated
deposits of approximately $693 million, and total consolidated shareholders'
equity of approximately $67 million. Through its direct and indirect
subsidiaries, Seacoast offers a broad range of banking and banking-related
services, including securities brokerage.
 
     Seacoast was organized under the laws of the state of Florida and commenced
operations in 1983. Seacoast's principal executive offices are located at 815
Colorado Avenue, Stuart, Florida 34994, and its telephone number at such address
is (561) 287-4000.
 
     Seacoast continually evaluates business combination opportunities and
frequently conducts due diligence activities in connection with possible
business combinations. As a result, business combination discussions and, in
some cases, negotiations frequently take place, and future business combinations
involving cash, debt, or equity securities can be expected. Any future business
combination or series of business combinations that Seacoast might undertake may
be material, in terms of assets acquired or liabilities assumed, to Seacoast's
financial condition. Recent business combinations in the banking industry have
typically involved the payment of a premium over book and market values. This
practice could result in dilution of book value and net income per share for the
acquirer.
 
     Additional information about Seacoast and its subsidiaries is included in
documents incorporated by reference in this Joint Proxy Statement. See
"AVAILABLE INFORMATION" and "DOCUMENTS INCORPORATED BY REFERENCE."
 
                                       46
<PAGE>   61
 
                        PRO FORMA FINANCIAL INFORMATION
 
             PRO FORMA COMBINED BALANCE SHEET FOR SEACOAST AND PSHC
                               DECEMBER 31, 1996
                                  (UNAUDITED)
 
    The following unaudited pro forma combined balance sheet presents (i) the
historical unaudited consolidated balance sheets of Seacoast and PSHC at
December 31, 1996, (ii) the pro forma combined balance sheet of Seacoast at
December 31, 1996, giving effect to the Merger, assuming such acquisition is
accounted for as a pooling-of-interests, and (iii) the pro forma combined
balance sheet of Seacoast at December 31, 1996, giving effect to the Merger,
assuming such acquisition is accounted for as a pooling of interests. This pro
forma balance sheet includes pro forma adjustments related to the issuance of
900,000 shares of Seacoast Class A Stock. The unaudited pro forma combined
balance sheet should be read in conjunction with the historical consolidated
financial statements of Seacoast and PSHC, including the respective notes
thereto, which are incorporated by reference in this Joint Proxy Statement, and
the unaudited pro forma financial information appearing elsewhere in this Joint
Proxy Statement. See "DOCUMENTS INCORPORATED BY REFERENCE,"
"SUMMARY -- Comparative Per Share Data," and "-- Summary Pro Forma Financial
Data." The pro forma combined balance sheet is not necessarily indicative of the
combined financial position that actually would have occurred if the Merger had
been consummated at the date indicated or which may be obtained in the future.
 
   
<TABLE>
<CAPTION>
                                                     DECEMBER 31, 1996        ADJUSTMENTS
                                                    -------------------   --------------------    PRO FORMA
                                                    SEACOAST     PSHC      DEBIT       CREDIT     COMBINED
                                                    --------   --------   --------    --------    ---------
                                                                    (DOLLARS IN THOUSANDS)
<S>                                                 <C>        <C>        <C>         <C>         <C>
                                                  ASSETS
Cash & Due from Banks.............................  $ 24,340   $  5,018                           $ 29,358
Federal Funds Sold................................    76,250      4,400                             80,650
Securities:
  At Market.......................................   159,133     10,757                            169,890
  At Amortized Cost...............................    49,667      3,612                             53,279
                                                    --------   --------   --------    --------    --------
         Total Securities.........................   208,800     14,369                            223,169
Loans, Net of Unearned Income.....................   471,597    101,171                            572,768
  Less Allowance for Loan Losses..................     4,286      1,371                              5,657
                                                    --------   --------   --------    --------    --------
         Net Loans................................   467,311     99,800                            567,111
Bank Premises and Equipment.......................    16,110      1,103                             17,213
Other Real Estate Owned...........................     1,011         53                              1,064
Goodwill..........................................     3,882          0                              3,882
Core Deposit Intangibles..........................     1,975          0                              1,975
Other Assets(1)...................................     8,729      5,350                             14,079
                                                    --------   --------   --------    --------    --------
                                                    $808,408   $130,093                           $938,501
                                                    ========   ========   ========    ========    ========
                                    LIABILITIES & SHAREHOLDERS' EQUITY
Demand Deposits...................................  $118,441   $ 19,582                           $138,023
Savings Deposits (including NOW, Savings & Money
  Market Accounts)................................   277,184     44,043                            321,227
Other Time Deposits...............................   250,239     45,861                            296,100
Time Certificates of $100,000 or More.............    46,893      9,250                             56,143
                                                    --------   --------   --------    --------    --------
         Total Deposits...........................   692,757    118,736                            811,493
Federal Funds Purchased and Securities Sold Under
  Agreement to Repurchase.........................    45,088          0                             45,088
Other Liabilities.................................     3,794      1,131                              4,925
                                                    --------   --------   --------    --------    --------
         Total Liabilities........................   741,639    119,867                            861,506
Preferred Stock...................................         0          0                                  0
Common Stock......................................       429          7          7(3)       90(2)      519
Additional Paid-In Capital........................    18,612      8,401         90(2)        7(3)   26,930
Retained Earnings.................................    50,121      1,970                             52,091
Treasury Stock....................................      (911)                                         (911)
                                                    --------   --------   --------    --------    --------
                                                      68,251     10,378         97          97      78,629
Securities Valuation Equity (Allowance)...........    (1,482)      (152)                            (1,634)
                                                    --------   --------   --------    --------    --------
         Total Shareholders' Equity...............    66,769     10,226                             76,995
                                                    --------   --------   --------    --------    --------
                                                    $808,408   $130,093                           $938,501
                                                    ========   ========   ========    ========    ========
</TABLE>
    
 
- ---------------
 
(1) Includes loans held for sale.
(2) Represents an entry to record the par value of the shares of Seacoast Class
    A Stock to be issued to be the stockholders and warrant holders of PSHC
    which will be accounted for under the pooling-of-interest method of
    accounting.
(3) Represents an entry to reclassify the historical common stock balances of
    PSHC to additional paid in capital.
 
                                       47
<PAGE>   62
 
                  PRO FORMA COMBINED STATEMENTS OF INCOME FOR
                               SEACOAST AND PSHC
                                  (UNAUDITED)
 
     The following unaudited pro forma combined statements of income have been
prepared for each of the three years in the period ended December 31, 1996, and
give effect to the Merger, assuming such acquisition is accounted for as a
pooling-of-interests. The following pro forma combined statements of income
present the pro forma results of continuing operations of Seacoast as if the
acquisition of PSHC had been consummated at the beginning of the period
presented, the date of PSHC's inception. The unaudited pro forma combined
statements of income should be read in conjunction with the historical
consolidated financial statements of Seacoast and PSHC, including the respective
notes thereto, which are incorporated by reference in this Joint Proxy
Statement, and the unaudited consolidated historical and other pro forma
financial information, including the notes thereto, appearing elsewhere in this
Joint Proxy Statement. See "DOCUMENTS INCORPORATED BY REFERENCE,"
"SUMMARY -- Comparative Per Share Data," and " Summary Pro Forma Financial
Data."
 
     The unaudited pro forma income from continuing operations per common and
common equivalent share is based on the combined weighted average number of
common shares and common share equivalents outstanding which include, where
appropriate, the assumed exercise or conversion of [warrants] and options. In
computing the unaudited pro forma income from continuing operations per common
share and common equivalent share, Seacoast utilizes the Treasury Stock method.
 
     The pro forma combined statements of income are not necessarily indicative
of the results that actually would have occurred if the Merger been consummated
at the dates indicated or which may be obtained in the future.
 
<TABLE>
<CAPTION>
                                          DECEMBER 31, 1996        ADJUSTMENTS
                                         -------------------    ------------------    PRO FORMA
                                         SEACOAST      PSHC      DEBIT     CREDIT     COMBINED
                                         ---------    ------    -------    -------    ---------
<S>                                      <C>          <C>       <C>        <C>        <C>
Interest on Investments................  $12,875...   $1,018                          $  13,893
Interest and Fees on Loans.............     37,655     8,245                             45,900
Interest on Federal Funds Sold.........      1,292       190                              1,482
                                         ---------    ------    -------    -------    ---------
          Total Interest Income........     51,822     9,453                             61,275
Interest on Deposits...................     19,976     4,318                             24,294
Interest on Borrowed Funds.............        744        14                                758
                                         ---------    ------    -------    -------    ---------
          Total Interest Expense.......     20,720     4,332                             25,052
  Net Interest Income..................     31,102     5,121                             36,223
Provision for Loan Losses..............        450       640                              1,090
                                         ---------    ------    -------    -------    ---------
  Net Interest Income After Provision
     for Loan Losses...................     30,652     4,481                             35,133
Noninterest Income.....................      8,714     1,053                              9,767
Securities Gains(1)....................         72       568                                640
                                         ---------    ------    -------    -------    ---------
          Total Noninterest Income.....      8,786     1,621                             10,407
Noninterest Expenses...................     27,517     4,251                             31,768
                                         ---------    ------    -------    -------    ---------
Income Before Income Taxes.............     11,921     1,851                             13,772
Provision for Income Taxes.............      4,312       621                              4,933
                                         ---------    ------    -------    -------    ---------
Net Income.............................  $   7,609    $1,230                          $   8,839
                                         =========    ======    =======    =======    =========
Per Share Common Stock Net Income......  $    1.77                                    $    1.70
Average Shares Outstanding.............  4,304,962                         900,000(2) 5,204,962
</TABLE>
 
<TABLE>
<CAPTION>
                                          DECEMBER 31, 1995        ADJUSTMENTS
                                         -------------------    ------------------    PRO FORMA
                                         SEACOAST      PSHC      DEBIT     CREDIT     COMBINED
                                         ---------    ------    -------    -------    ---------
<S>                                      <C>          <C>       <C>        <C>        <C>
Interest on Investments................  $  15,117    $1,752                          $  16,869
Interest and Fees on Loans.............     30,707     6,188                             36,895
Interest on Federal Funds Sold.........      2,327       169                              2,496
                                         ---------    ------    -------    -------    ---------
          Total Interest Income........     48,151     8,109                             56,260
</TABLE>
 
                                       48
<PAGE>   63
 
<TABLE>
<CAPTION>
                                          DECEMBER 31, 1995        ADJUSTMENTS
                                         -------------------    ------------------    PRO FORMA
                                         SEACOAST      PSHC      DEBIT     CREDIT     COMBINED
                                         ---------    ------    -------    -------    ---------
<S>                                      <C>          <C>       <C>        <C>        <C>
Interest on Deposits...................     20,702     4,114                             24,816
Interest on Borrowed Funds.............        359        50                                409
                                         ---------    ------                          ---------
          Total Interest Expense.......     21,061     4,164                             25,225
  Net Interest Income..................     27,090     3,945                             31,035
Provision for Loan Losses..............        250       206                                456
                                         ---------    ------                          ---------
  Net Interest Income After Provision
     for Loan Losses...................  $  26,840    $3,739                          $  30,579
Noninterest Income.....................      7,517       907                              8,424
Securities Gains(1)....................        480       264                                744
                                         ---------    ------                          ---------
          Total Noninterest Income.....      7,997     1,171                              9,168
Noninterest Expenses...................     24,246     3,520                             27,766
                                         ---------    ------                          ---------
Income Before Income Taxes ............     10,591     1,390                             11,981
Provision for Income Taxes ............      3,765       443                              4,208
                                         ---------    ------                          ---------
Net Income.............................  $   6,826    $  947                          $   7,773
                                         =========    ======                          =========
Per Share Common Stock Net Income......  $    1.58                                    $    1.49
Average Shares Outstanding.............  4,309,590                         900,000(2) 5,209,590
</TABLE>
 
<TABLE>
<CAPTION>
                                          DECEMBER 31, 1994        ADJUSTMENTS
                                         -------------------    ------------------    PRO FORMA
                                         SEACOAST      PSHC      DEBIT     CREDIT     COMBINED
                                         ---------    ------    -------    -------    ---------
<S>                                      <C>          <C>       <C>        <C>        <C>
Interest on Investments................  $  16,630    $1,815                          $  18,445
Interest and Fees on Loans.............     21,782     3,868                             25,650
Interest on Federal Funds Sold.........        629        37                                666
                                         ---------    ------                          ---------
          Total Interest Income........     39,041     5,720                             44,761
Interest on Deposits...................     13,572     2,049                             15,621
Interest on Borrowed Funds.............        269       113                                382
                                         ---------    ------                          ---------
          Total Interest Expense.......     13,841     2,162                             16,003
  Net Interest Income..................     25,200     3,558                             28,758
Provision for Loan Losses..............        145       163                                308
                                         ---------    ------                          ---------
  Net Interest Income After Provision
     for Loan Losses...................  25,055...     3,395                             28,450
Noninterest Income.....................      6,475       695                              7,170
Securities Gains(1)....................        752        61                                813
                                         ---------    ------                          ---------
          Total Noninterest Income.....      7,227       756                              7,983
Noninterest Expenses...................     23,005     2,679                             25,684
                                         ---------    ------                          ---------
Income Before Income Taxes.............      9,277     1,472                             10,749
Provision for Income Taxes.............      3,091       471                              3,562
                                         ---------    ------                          ---------
Net Income.............................  $   6,186    $1,001                          $   7,187
                                         =========    ======                          =========
Per Share Common Stock Net Income......  $    1.44                                    $    1.38
Average Shares Outstanding.............  4,305,592                         900,000(2) 5,205,592
</TABLE>
 
- ---------------
 
Notes to Unaudited Condensed Consolidated Pro Forma Financial Statements
 
(1) Includes gains on loans held for sale.
(2) Includes the weighted average effect of shares and common share equivalents
    to be issued in the transaction.
 
                                       49
<PAGE>   64
 
                             ELECTION OF DIRECTORS
 
GENERAL
 
   
     The Seacoast Annual Meeting is also being held to reelect eight directors
of Seacoast to serve a one-year term of office expiring at the 1998 Annual
Meeting of Shareholders and until their successors have been elected and
qualified. All of the nominees are presently directors of Seacoast and have
served as directors of Seacoast since its inception in 1983, except Dennis S.
Hudson, III, who was first elected a director in 1984. All of the nominees also
serve as directors of Seacoast's banking subsidiary, FNB. The members of the
Boards of Directors of FNB and Seacoast are the same except for Stephen E.
Bohner, Ms. Marian B. Monroe and A. Douglas Gilbert, who are members of FNB's
Board only. The Seacoast Board of Directors has been fixed at 10 persons,
including the eight nominees for reelection. The remaining two vacancies are
expected to be filled by Messrs. Furst and Fogal following the Merger's
Effective Time. See "DESCRIPTION OF THE MERGER -- Management and Operations
after the Merger; -- Interest of Certain Persons in the Merger"; "EFFECT OF THE
MERGER ON RIGHTS OF SHAREHOLDERS -- Classified Board of Directors and Absence of
Cumulative Voting" and "ELECTION OF DIRECTORS."
    
 
     All shares represented by valid Proxies received pursuant to this
solicitation and not revoked before they are exercised will be voted in the
manner specified therein. If no specification is made, the Proxies will be voted
for the election of the eight nominees listed below. In the event that any
nominee is unable to serve (which is not anticipated), the persons designated as
Proxies will cast votes for the remaining nominees and for such replacements, if
any, as may be nominated by Seacoast's Board of Directors acting as the
Nominating Committee. Proxies cannot be voted for a greater number of persons
than the number of nominees specified herein (eight persons).
 
     The affirmative vote of the holders of shares of Common Stock representing
a plurality of the votes cast at the Meeting at which a quorum is present, is
required for the reelection of the directors listed below.
 
     THE NOMINEES HAVE BEEN NOMINATED BY SEACOAST'S BOARD OF DIRECTORS AND THE
BOARD UNANIMOUSLY RECOMMENDS A VOTE FOR THE REELECTION OF ALL EIGHT NOMINEES
LISTED BELOW.
 
   
     The following table sets forth the name and age of each nominee and each
senior executive officer of Seacoast who is not a director or nominee, the year
in which he was first elected a director or executive officer, as the case may
be, a description of his position and offices with Seacoast or FNB, if any, a
brief description of his principal occupation and business experience during at
least the last five years, directorships presently held by him in companies
other than Seacoast with registered securities, and certain other information
including his age and the number of shares of Seacoast Class A Stock and Class B
Stock beneficially owned by him on February 24, 1997. In addition, if the
acquisition of PSHC described herein is consummated then it is anticipated that
Jeffrey S. Furst and Christopher E. Fogal, current directors of PSHC, will be
added to Seacoast Board and that J. Hal Roberts will become an executive officer
of Seacoast and FNB. See "DESCRIPTION OF THE MERGER -- Management and Operations
after the Merger." See "-- Information About the Board of Directors and Its
Committees."
    
 
<TABLE>
<CAPTION>
                                                                          SHARES OF COMMON STOCK
                                                                          BENEFICIALLY OWNED AND
NAME, AGE AND YEAR                                                         PERCENTAGE OF COMMON
FIRST ELECTED OR                                                           STOCK OUTSTANDING(1)
APPOINTED A DIRECTOR                                                      ----------------------
OR EXECUTIVE OFFICER                   INFORMATION ABOUT NOMINEE          CLASS A        CLASS B
- --------------------                   -------------------------          -------        -------
<S>                             <C>                                       <C>            <C>
NOMINEES:
Jeffrey C. Bruner (46)........  Mr. Bruner has been a self-employed real    7,140(2)(4)       90(3)(4)
  1983                            estate investor in Stuart, Florida
                                  since 1972.
</TABLE>
 
                                       50
<PAGE>   65
<TABLE>
<CAPTION>
                                                                          SHARES OF COMMON STOCK
                                                                          BENEFICIALLY OWNED AND
NAME, AGE AND YEAR                                                         PERCENTAGE OF COMMON
FIRST ELECTED OR                                                           STOCK OUTSTANDING(1)
APPOINTED A DIRECTOR                                                      ----------------------
OR EXECUTIVE OFFICER                   INFORMATION ABOUT NOMINEE          CLASS A        CLASS B
- --------------------                   -------------------------          -------        -------
<S>                             <C>                                       <C>            <C>
John H. Crane (67)............  Mr. Crane has been President of Krauss &   12,870(4)(5)       --
  1983                            Crane, Inc., an electrical contracting
                                  firm located in Stuart, Florida, since
                                  1957, and Vice President of C&W Fish
                                  Company, Inc., a fish processing plant
                                  located in the Stuart, Florida area,
                                  since 1982.
Evans Crary, Jr. (67).........  Mr. Crary has served as a member of         4,597(4)(6)    1,665(4)
  1983                            Crary, Buchanan, Bowdish, Bovie, Lord,
                                  Roby & Evans, Chartered, a law firm
                                  located in Stuart, Florida, since
                                  1993, and prior thereto he served as
                                  President and a shareholder of the law
                                  firm since 1974. Mr. Crary has
                                  practiced law in Stuart, Florida since
                                  1952.
Dale M. Hudson (62)...........  Mr. Hudson was named Chief Executive      440,804(8)     154,151(9)
  1983(7)                         Officer of Seacoast in 1992 and has       11.17%         40.08%
                                  served as President of Seacoast since
                                  1990. He was named Chairman of the
                                  Board of FNB in September 1992 after
                                  serving as Vice Chairman and President
                                  of FNB since 1978.
Dennis S. Hudson, Jr. (69)....  Mr. Hudson was named Chairman of the      310,039(10)    125,753(11)
  1983(7)                         Board of Seacoast in 1990. He served       7.85%         32.69%
                                  as Chief Executive Officer of Seacoast
                                  from 1983 until 1992 and Chairman of
                                  FNB from 1969 until 1992.
Dennis S. Hudson, III (41)....  Mr. Hudson has served as Executive Vice    35,800(4)(12)   8,052
  1984(7)                         President and Chief Operating Officer                     1.68%
                                  of Seacoast since 1990 and President
                                  and Chief Executive Officer of FNB
                                  since 1992. Prior thereto, he served
                                  as Executive Vice President and Chief
                                  Operating Officer of FNB from 1990 to
                                  1992, and Senior Vice President of FNB
                                  from 1983 to 1990.
John R. Santarsiero, Jr.        Mr. Santarsiero is a private investor       3,198(4)         300(4)
  (52)........................  and former owner of an automobile
  1983                            dealership located in Stuart, Florida.
Thomas H. Thurlow, Jr. (60)...  Mr. Thurlow has been an officer and a       4,725(4)(13)      --
  1983(7)                         director of Thurlow & Smith, P. A., a
                                  law firm located in Stuart, Florida,
                                  since 1981 and has practiced law in
                                  Stuart, Florida since 1961.
</TABLE>
 
                                       51
<PAGE>   66
<TABLE>
<CAPTION>
                                                                          SHARES OF COMMON STOCK
                                                                          BENEFICIALLY OWNED AND
NAME, AGE AND YEAR                                                         PERCENTAGE OF COMMON
FIRST ELECTED OR                                                           STOCK OUTSTANDING(1)
APPOINTED A DIRECTOR                                                      ----------------------
OR EXECUTIVE OFFICER                   INFORMATION ABOUT NOMINEE          CLASS A        CLASS B
- --------------------                   -------------------------          -------        -------
<S>                             <C>                                       <C>            <C>
EXECUTIVE OFFICERS WHO ARE NOT ALSO NOMINEES OR DIRECTORS:
A. Douglas Gilbert (56).......  Mr. Gilbert has served as Executive Vice   24,886(4)(14)      --
  1990                            President and Chief Credit Officer of
                                  Seacoast since July 1990, and also has
                                  served as Chief Banking Officer from
                                  September 1992 to October 1995. Mr.
                                  Gilbert was named Executive Vice
                                  President and Chief Operating and
                                  Credit Officer of FNB in October 1994.
                                  Prior thereto, he served as Executive
                                  Vice President and Chief Banking and
                                  Credit Officer of FNB from 1992 to
                                  1994, and Executive Vice President and
                                  Chief Credit Officer of FNB from 1990
                                  to 1992.
C. William Curtis, Jr. (58)...  Mr. Curtis has served as Executive Vice    10,000(4)(15)      --
  1995                            President and Chief Banking Officer of
                                  Seacoast and FNB since October 1995.
                                  Prior thereto, Mr. Curtis was Area
                                  President of First Union Bank in
                                  Sarasota and Manatee Counties, a $970
                                  million banking unit with 21 offices.
                                  He served as Senior Marketing Officer
                                  for Florida National Banks of Florida,
                                  Inc. for 10 years prior to coming to
                                  the Treasure Coast as President of
                                  Florida National Bank in Indian River
                                  County from 1985 to 1989.
William R. Hahl (48)..........  Mr. Hahl has been Senior Vice              19,000(4)(16)      --
  1990                            President/Finance Group and Chief
                                  Financial Officer of Seacoast and FNB
                                  since July 1990.
Nominees and executive
  officers as a group (11
  persons)(17)................                                            865,559        290,011
                                                                            22.04%         60.46%
</TABLE>
 
- ---------------
 
 (1) Information relating to beneficial ownership of Common Stock by directors
     is based upon information furnished by each person using "beneficial
     ownership" concepts set forth in rules of the SEC under the Exchange Act.
     Under such rules, a person is deemed to be a "beneficial owner" of a
     security if that person has or shares "voting power," which includes the
     power to vote or direct the voting of such security, or "investment power,"
     which includes the power to dispose of or to direct the disposition of such
     security. The person is also deemed to be a beneficial owner of any
     security of which that person has a right to acquire beneficial ownership
     within 60 days. Under such rules, more than one person may be deemed to be
     a beneficial owner of the same securities, and a person may be deemed to be
     a beneficial owner of securities as to which he or she may disclaim any
     beneficial ownership. Accordingly, nominees are named as beneficial owners
     of shares as to which they may disclaim any beneficial interest. Except as
     indicated in other notes to this table describing special relationships
     with other persons and
 
                                       52
<PAGE>   67
 
     specifying shared voting or investment power, directors possess sole voting
     and investment power with respect to all shares of Common Stock set forth
     opposite their names.
 (2) Includes 180 shares held jointly with Mr. Bruner's wife, 2,150 shares held
     by Mr. Bruner as custodian for his son, and 4,000 shares held by Mr. Bruner
     as custodian for his two nephews as to which shares Mr. Bruner may be
     deemed to share voting and investment power.
 (3) Includes 90 shares held jointly with Mr. Bruner's wife as to which shares
     Mr. Bruner may be deemed to share voting and investment power.
 (4) Less than 1%.
 (5) Includes 3,510 shares held by Mr. Crane's wife, as to which shares Mr.
     Crane may be deemed to share voting and investment power.
 (6) Includes 1,268 shares held by the trustee for the IRA of Mr. Crary.
 (7) Dennis S. Hudson, Jr. and Dale M. Hudson are brothers. Dale M. Hudson is
     married to the sister of Thomas H. Thurlow, Jr. Dennis S. Hudson, III is
     the son of Dennis S. Hudson, Jr. and the nephew of Dale M. Hudson.
 (8) Includes 24,025 shares held by Mr. Hudson's wife, 41,297 shares held
     jointly with Mr. Hudson's wife, and 72,387 shares held by Mr. Hudson's
     three children, as to which shares Mr. Hudson may be deemed to share voting
     and investment power.
 (9) Includes 3,960 shares held by Mr. Hudson's wife, 20,649 shares held jointly
     with Mr. Hudson's wife, and 9,543 shares held by Mr. Hudson's three
     children, as to which shares Mr. Hudson may be deemed to share voting and
     investment power.
(10) Includes 47,417 shares held by Mr. Hudson's wife, 18,780 shares held by Mr.
     Hudson's three children, as to which shares Mr. Hudson may be deemed to
     share voting and investment power and as to which Mr. Hudson disclaims
     beneficial ownership.
(11) Includes 23,709 shares held by Mr. Hudson's wife, 6,270 shares held by Mr.
     Hudson's three children, as to which shares Mr. Hudson may be deemed to
     share voting and investment power and as to which Mr. Hudson disclaims
     beneficial ownership.
(12) Includes 44 shares held by Mr. Hudson's two sons, as to which shares Mr.
     Hudson may be deemed to share voting and investment power, and 33,000
     shares that Mr. Hudson has the right to acquire by exercising options that
     are exercisable within 60 days after the Seacoast Record Date.
(13) Includes 1,575 shares owned by Mr. Thurlow's wife and 1,575 shares held by
     Mr. Thurlow's three children, as to which shares Mr. Thurlow may be deemed
     to share voting and investment power.
(14) Includes 200 shares held in Mr. Gilbert's IRA and 23,000 shares that Mr.
     Gilbert has the right to acquire by exercising options that are exercisable
     within 60 days after the Seacoast Record Date.
(15) Includes 8,750 shares of unvested Restricted Stock granted by Seacoast,
     1,250 of which will be fully vested on March 29, 1997.
(16) Includes 19,000 shares that Mr. Hahl has the right to acquire by exercising
     options that are exercisable within 60 days after the Seacoast Record Date.
(17) The percentage of Seacoast Class A Stock that will be owned by Seacoast
     directors and executive officers at the Effective Time does not include
                    shares of Seacoast Class A Stock that Messrs. Jeffrey S.
     Furst, Christopher E. Fogal and J. Hal Roberts, Jr. will receive in the
     Merger. Messrs. Furst and Fogal are expected to be elected to the Seacoast
     and FNB Boards of Directors following the Effective Time and Mr. Roberts
     will become an executive officer of Seacoast following the Effective Time.
 
     Mr. Furst presently beneficially owns 29,100 shares of PSHC Common Stock
and 21,175 PSHC Warrants. Mr. Fogal presently beneficially owns 12,100 shares of
PSHC Common Stock and 12,100 PSHC Warrants. Mr. Roberts presently beneficially
owns 20,896 shares of PSHC Common Stock, 11,495 PSHC Warrants and 24,200 vested
PSHC Stock Options. Based on the Estimated Stock Exchange Ratio of .9969, and
the Estimated Warrant Exchange Ratio of .70957, Mr. Furst will have the
opportunity to convert the PSHC Common Stock and Warrants which he beneficially
owns into an aggregate of approximately 44,034 shares of Seacoast Class A Stock
(representing approximately 0.85% of the shares of Seacoast Class A stock
expected to be outstanding after the Merger) at the Effective Time. Similarly,
Mr. Fogal will have the opportunity to convert the PSHC Common Stock and
Warrants which he beneficially owns into an aggregate
 
                                       53
<PAGE>   68
 
of approximately 20,647 shares of Seacoast Class A Stock (representing
approximately 0.4% of the shares of Seacoast Class A Stock expected to be
outstanding after the Merger). Mr. Roberts will have the opportunity to convert
the PSHC Common Stock, Warrants, and Stock Options which he beneficially owns
into an aggregate amount of approximately 53,112 shares of Seacoast Class A
Stock (representing approximately 1.0% of the shares of Seacoast Class A Stock
expected to be outstanding after the Merger).
 
INFORMATION ABOUT THE BOARD OF DIRECTORS AND ITS COMMITTEES
 
     The Board of Directors of Seacoast held eight meetings during 1996. All of
the directors attended at least 75% of the total number of meetings of the Board
of Directors and meetings of the Board committees on which they served for
Seacoast and FNB. Seacoast's Board of Directors has two standing committees: the
Salary and Benefits Committee and the Audit Committee, both of which serve the
same functions for FNB.
 
     In addition, FNB's Board of Directors has the following standing committees
separate from Seacoast: Executive Committee, Investment Committee, Trust
Committee and the Directors Loan Committee. Such committees perform those duties
customarily performed by similar committees at other financial institutions.
 
     Seacoast's Salary and Benefits Committee is comprised of Messrs. Crary
(Chairman), Bruner, Dennis S. Hudson, Jr. and Santarsiero and Ms. Marian Monroe.
This Committee has the authority to determine the compensation of Seacoast's
executive officers and employees, and administers various of Seacoast's benefit
and incentive plans. This Committee has the power to interpret the provisions of
Seacoast's Pension Plan, Profit Sharing Plan, Employee Stock Purchase Plan, the
Seacoast Banking Corporation of Florida 1991 Stock Option and Stock Appreciation
Right Plan (the "1991 Incentive Plan") and the Seacoast Banking Corporation of
Florida 1996 Long-Term Incentive Plan (the "1996 Incentive Plan"). Two meetings
were held by this Committee in 1996. See "-- Salary and Benefits Committee
Report."
 
     The Audit Committee recommends on an annual basis to the Board of Directors
a public accounting firm to be engaged as independent auditors for Seacoast for
the next fiscal year, reviews the plan for the audit engagement, and reviews
financial statements, the internal audit plans and reports financial reporting
procedures and reports of regulatory authorities. This Committee periodically
reports to the Board of Directors. This Committee is comprised of Messrs. Bruner
(Chairman), Crane and Santarsiero and it held five meetings in 1996.
 
     The entire Board of Directors serves as the Nominating Committee for the
purpose of nominating persons to serve on the Board of Directors. While nominees
recommended by shareholders may be considered, this Committee has not actively
solicited recommendations nor established any procedures for this purpose. The
Board held one meeting in its capacity as the Nominating Committee during 1996.
 
     Board members who are not executive officers of Seacoast are paid an annual
retainer of $15,000 for their service as directors of Seacoast and its
subsidiaries. In addition to the annual retainers, outside Board members receive
$500 for each Board meeting attended, $500 for each committee meeting attended
and $600 for each committee meeting chaired.
 
EXECUTIVE OFFICERS
 
     Executive officers are appointed annually at the organizational meeting of
the respective Boards of Directors of Seacoast and FNB following the annual
meetings of shareholders, to serve until the next annual meeting and until
successors are chosen and qualified. The table set forth under "ELECTION OF
DIRECTORS -- General" lists the nominees for election to the Board of Directors
as well as the named executive officers of Seacoast and FNB who are not nominees
to or members of the Board of Directors, their ages and respective offices held
by them, the period each such position has been held, a brief account of their
business experience for at least the past five years, and the number of shares
of Seacoast Common Stock beneficially owned by each of them on
                              , 1997.
 
                                       54
<PAGE>   69
 
MANAGEMENT STOCK OWNERSHIP
 
     As of                               , 1997, based on available information,
all directors and executive officers of Seacoast as a group (11 persons)
beneficially owned approximately                shares of Seacoast Class A
Stock, constituting      % of the total number of shares of Seacoast Class A
Stock outstanding at that date, and approximately                shares of Class
B Stock, constituting      % of the total number of shares of Class B Stock
outstanding at that date. Seacoast's directors and executive officers
beneficially owned as of that date, shares of Common Stock having
               votes, or      % of the total votes represented by Seacoast Class
A and Class B Stock outstanding on the Seacoast Record Date. See "ELECTION OF
DIRECTORS -- General" and "Principal Shareholders."
 
COMPENSATION OF EXECUTIVE OFFICERS
 
     Under rules established by the SEC, Seacoast is required to provide certain
data and information in regard to the compensation and benefits provided to its
chief executive officer and other executive officers, including the four other
highly compensated executive officers (collectively, these officers are referred
to as the "named executive officers"). The disclosure requirements for the named
executive officers include the use of tables and a report explaining the
rationale and considerations that led to fundamental executive compensation
decisions affecting these individuals.
 
     The following report reflects Seacoast's compensation philosophy as
endorsed by the Board of Directors and the Salary and Benefits Committee and
resulting actions taken by Seacoast for the reporting periods shown in the
various compensation tables supporting the report. The Salary and Benefits
Committee either approves or recommends to the Board of Directors payment
amounts and award levels for executive officers of Seacoast and its
subsidiaries.
 
SALARY AND BENEFITS COMMITTEE REPORT
 
  General
 
     During 1996, the Salary and Benefits Committee of the Board of Directors
was composed of four members, three of whom are not officers or employees of
Seacoast or FNB. The Board of Directors designates the members and Chairman of
such committee.
 
  Compensation Policy
 
     The policies that govern the Salary and Benefits Committee's executive
compensation decisions are designed to align changes in total compensation with
changes in the value created for Seacoast's shareholders. The Salary and
Benefits Committee believes that compensation of executive officers and others
should be directly linked to Seacoast's operating performance and that
achievement of performance objectives over time is the primary determinant of
share price.
 
     The underlying objectives of the Salary and Benefits Committee's
compensation strategy are to establish incentives for certain executives and
others to achieve and maintain short-term and long-term operating performance
goals for Seacoast, to link executive and shareholder interests through
equity-based plans, and to provide a compensation package that recognizes
individual contributions as well as overall business results. At Seacoast, pay
for performance relating to executive officer compensation comprises three
areas: base salary, cash based short-term annual incentives, and long-term stock
and cash incentives.
 
  Base Salary and Increases
 
     In establishing executive officer salaries and increases, the Committee
considers individual annual performance and the relationship of total
compensation to the defined salary market. The decision to increase base pay is
recommended by the chief executive officer and approved by the Salary and
Benefits Committee using performance results documented and measured annually
through a formal management-by-objectives ("MBO") program. Information regarding
salaries paid in the market is obtained through formal salary surveys and other
means and is used in the decision process to ensure competitiveness with
Seacoast's peers
 
                                       55
<PAGE>   70
 
and competitors. Seacoast's general philosophy is to provide base pay
competitive with the market, and to reward individual performance while
positioning salaries consistent with Company performance.
 
  Short-Term Incentives
 
     Seacoast's Key Manager Incentive Plan is a primary strategy to align
short-term cash compensation with individual performance and performance for the
shareholders. Funding for this annual incentive plan is dependent on Seacoast
first attaining defined performance thresholds for return on assets and earnings
per share. Once this threshold is attained, the Salary and Benefits Committee,
using recommendations from FNB's chief executive officer, approves awards to
those officers who have made superior contributions to Company profitability as
measured and reported through individual performance goals established at the
beginning of the year. As specified in the plan, the payout schedule is designed
to pay a smaller number of officers the highest level of funded cash incentives
to ensure that a meaningful reward is provided to the organization's top
performers. This philosophy better controls overall compensation expenses by
reducing the need for significant annual base salary increases as a reward for
past performance, and places more emphasis on annual profitability and the
potential rewards associated with future performance. Salary market information
is used to establish competitive rewards that are adequate in size to motivate
strong individual performance during the year. The Key Manager Incentive Plan
paid an aggregate of $512,810 in 1996, which was distributed among 18 persons.
 
  Long-Term Incentives
 
     Long-term incentive awards have been made under the 1991 Incentive Plan and
the 1996 Incentive Plan. Stock options granted under the plan are designed to
motivate sustained high levels of individual performance and align the interests
of key employees with those of Seacoast's shareholders by rewarding capital
appreciation and earnings growth. Upon the recommendation of the chief executive
officer, and subject to approval by the Salary and Benefits Committee, stock
options are awarded annually to those key officers whose performance during the
year has made a significant contribution to Seacoast's long-term growth. In
addition, during 1996, restricted stock awards totaling 5,000 shares of Seacoast
Class A Stock were granted outside of the 1991 Incentive Plan and 1996 Incentive
Plan to retain executive officers of FNB.
 
  Deduction Limit
 
     At this time, because of its compensation levels, Seacoast does not appear
to be at risk of losing deductions under Section 162(m) of the Code, which
generally establishes, with certain exceptions, a $1 million deduction limit on
executive compensation for all publicly held companies. As a result, Seacoast
has not established a formal policy regarding such limit, but will evaluate the
necessity for developing such a policy in the future.
 
  Chief Executive Pay
 
     The Salary and Benefits Committee formally reviews the compensation paid to
the chief executive officers of Seacoast and FNB during the first quarter of
each year. Final approval of chief executive compensation is made by the Board
of Directors. Changes in base salary and the awarding of cash and stock
incentives are based on overall financial performance and profitability related
to objectives stated in Seacoast's strategic performance plan and the
initiatives taken to direct Seacoast. In addition, utilizing published surveys,
databases, and proxy data, including, for example, public information compiled
from the SNL Executive Compensation Report (the "Survey Data"), the Salary and
Benefits Committee surveyed the total compensation of chief executive officers
of comparable-sized financial institutions located in comparable markets from
across the nation, as well as of locally-based banks and thrifts. While there is
likely to be a substantial overlap between the financial institutions included
in the Survey Data and the banks and thrifts represented in the Nasdaq Bank
Index line on the shareholder return performance graph, below, the groups are
not exactly the same. The Compensation and Benefits Committee believes that the
most direct competitors for executive talent are not necessarily the same as the
companies that would be included in the published industry index established for
comparing shareholder returns.
 
     After reviewing survey data, the salary for Mr. Dennis S. Hudson, III,
Chief Executive Officer of FNB, was increased by $20,000 to $255,000 annually,
the annual salary for Mr. Dale M. Hudson, Chief Executive
 
                                       56
<PAGE>   71
 
Officer for Seacoast, was increased by $7,750 to $162,750, and the salary for
Dennis S. Hudson, Jr., Chairman of the Board of Seacoast was not increased,
which maintained their respective total compensation at the median of the
comparative groups. Based on specific accomplishments and the overall financial
performance of Seacoast including the achievement of above targeted performance
goals in 1996, Mr. Hudson, III was awarded a cash incentive award of $94,500
under the Key Manager Incentive Plan.
 
  Summary
 
     In summary, the Salary and Benefits Committee believes that Seacoast's
compensation program is reasonable and competitive with compensation paid by
other financial institutions of similar size. The program is designed to reward
managers for strong personal, Company and share value performance. The Salary
and Benefits Committee monitors the various guidelines that make up the program
and reserves the right to adjust them as necessary to continue to meet Company
and shareholder objectives.
 
               Evans Crary, Jr., Chairman
           Jeffrey C. Bruner
           Dennis S. Hudson, Jr.
           Marian B. Monroe
           John R. Santarsiero, Jr.
 
     The table below sets forth certain elements of compensation for the named
executive officers of Seacoast or FNB for the periods indicated.
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                   LONG-TERM COMPENSATION
                                                                -----------------------------
                                                                                  SECURITIES        ALL
                                                                 RESTRICTED       UNDERLYING       OTHER
                                YEAR    SALARY      BONUS       STOCK AWARDS     OPTIONS/SARS   COMPENSATION
NAME AND PRINCIPAL POSITION(A)  (B)     ($)(C)    ($)(1)(D)        ($)(F)           (#)(G)         ($)(I)
- ------------------------------  ----   --------   ---------     ------------     ------------   ------------
<S>                             <C>    <C>        <C>           <C>              <C>            <C>
Dennis S. Hudson, Jr..........  1996   $144,885         --              --              --        $14,936(2)
  Chairman of the Board of      1995    145,698         --              --              --         14,996
  Seacoast                      1994    144,130         --              --              --         13,841
Dale M. Hudson................  1996   $161,027         --              --              --        $16,932(3)
  President & Chief             1995    144,676         --              --              --         15,495
  Executive Officer of          1994    141,859         --              --              --         16,549
  Seacoast, Chairman of FNB
Dennis S. Hudson, III.........  1996   $236,388    $94,500              --           6,000        $27,546(4)
  Executive Vice President      1995    223,760     73,000              --           6,000         20,187
  & Chief Operating Officer     1994    189,120     35,000              --              --         17,692
  of Seacoast, President &
  Chief Executive Officer of
  FNB
A. Douglas Gilbert............  1996   $215,839    $94,500              --           6,000        $22,247(6)
  Executive Vice President      1995    202,038     70,000        $183,100(5)        6,000         20,412
  & Chief Banking &             1994    178,409     35,000(5)           --              --         18,359
  Credit Officer of Seacoast,
  Executive Vice President &
  Chief Operating & Credit
  Officer of FNB
C. William Curtis, Jr.........  1996   $169,756    $64,000        $111,250(8)       11,000        $11,572(10)
  Executive Vice President      1995     57,624     90,000(7)      108,750(9)           --            206
  & Chief Banking Officer       1994         --         --              --              --             --
  of FNB
</TABLE>
 
                                       57
<PAGE>   72
 
<TABLE>
<CAPTION>
                                                                   LONG-TERM COMPENSATION
                                                                -----------------------------
                                                                                  SECURITIES        ALL
                                                                 RESTRICTED       UNDERLYING       OTHER
                                YEAR    SALARY      BONUS       STOCK AWARDS     OPTIONS/SARS   COMPENSATION
NAME AND PRINCIPAL POSITION(A)  (B)     ($)(C)    ($)(1)(D)        ($)(F)           (#)(G)         ($)(I)
- ------------------------------  ----   --------   ---------     ------------     ------------   ------------
<S>                             <C>    <C>        <C>           <C>              <C>            <C>
William R. Hahl...............  1996   $149,131    $30,000              --           4,000        $16,400(11)
  Senior Vice President         1995    142,492     30,000              --           5,000         15,792
  & Chief Financial Officer     1994    134,124     15,000              --              --         16,399
  of Seacoast and FNB
</TABLE>
 
- ---------------
 
 (1) Incentive cash compensation paid for results achieved during the applicable
     fiscal year in accordance with the Key Manager Incentive Plan as well as
     certain other bonuses related to performance or deemed necessary to attract
     new management. See "-- Salary and Benefits Committee Report."
 
 (2) This includes $2,406 in insurance premiums paid by Seacoast on group term
     life insurance benefits in excess of $50,000 ("excess life insurance
     benefits"), $7,323 in employer matching contributions to the Profit Sharing
     Plan, $2,017 in profit sharing, $2,690 in employer discretionary retirement
     contributions, and $500 paid by the employer into the Code Section 125
     Cafeteria Plan (the "Cafeteria Plan").
 
 (3) This includes $2,406 in excess life insurance benefits, $8,601 in employer
     matching contributions to the Profit Sharing Plan, $2,325 in profit
     sharing, $3,100 in employer discretionary retirement contributions, and
     $500 paid by the employer into the Cafeteria Plan.
 
 (4) This includes $2,406 in excess life insurance benefits, $13,860 in employer
     matching contributions to the Profit Sharing Plan, $4,620 in profit
     sharing, $6,160 in employer discretionary retirement contributions, and
     $500 paid by the employer into the Cafeteria Plan.
 
 (5) This amount represents a restricted stock award of 10,000 shares of
     Seacoast's Class A Stock, which was awarded to Mr. Gilbert on March 31,
     1995, based on the closing sale price of Seacoast's Class A Stock on the
     Nasdaq National Market on March 31, 1995. One quarter of the shares covered
     by this award became vested on January 31, 1996, and another 2,500 shares
     vested on January 1, 1997. The remaining shares will, as long as Mr.
     Gilbert remains employed by Seacoast, vest in increments of 2,500 shares on
     January 1, 1998 and 1999.
 
 (6) This includes $2,406 in excess life insurance benefits, $11,991 in employer
     matching contributions to the Profit Sharing Plan, $3,150 in profit
     sharing, $4,200 in employer discretionary retirement contributions, and
     $500 paid by the employer into the Cafeteria Plan.
 
 (7) This amount includes a $45,000 cash bonus plus $45,000 in cash paid under
     the Key Manager Incentive Plan.
 
 (8) This amount represents a restricted stock award of 5,000 shares of
     Seacoast's Class A Stock which was awarded to Mr. Curtis on March 29, 1996,
     based on the closing sale price of Seacoast's Class A Stock on the Nasdaq
     National Market on March 29, 1996. One quarter of the shares covered by
     this award will vest on March 29, 1997, and the remaining shares will, as
     long as Mr. Curtis remains employed by Seacoast, vest in increments of
     1,250 shares on March 29, 1998, 1999 and 2000.
 
 (9) This amount represents a restricted stock award of 5,000 shares of
     Seacoast's Class A Stock which was awarded to Mr. Curtis on October 2,
     1995, based on the closing sale price of Seacoast's Class A Stock on the
     Nasdaq National Market on October 2, 1995. One quarter of the shares
     covered by this award vested on December 31, 1996, and the remaining shares
     will, as long as Mr. Curtis remains employed by Seacoast, vest in
     increments of 1,250 shares on December 31, 1997, 1998 and 1999.
 
(10) This includes $2,406 in excess life insurance benefits, $7,266 in employer
     matching contributions to the Profit Sharing Plan, $600 in profit sharing,
     $800 in employer discretionary retirement contributions, and $500 paid by
     the employer into the Cafeteria Plan.
 
(11) This includes $2,406 in excess life insurance benefits, $8,279 in employer
     matching contributions to the Profit Sharing Plan, $2,235 in profit
     sharing, $2,980 in employer discretionary retirement contributions, and
     $500 paid by the employer into the Cafeteria Plan.
 
                                       58
<PAGE>   73
 
                         GRANTS OF OPTIONS/SARS IN 1996
 
     The following table sets forth certain information concerning options
granted during 1996 to the named executive officers. No stock appreciation
rights ("SARs") were granted in 1996.
 
<TABLE>
<CAPTION>
                                                                                       POTENTIAL REALIZABLE
                                                                                         VALUE AT ASSUMED
                                                                                          ANNUAL RATES OF
                                                                                            STOCK PRICE
                                                                                         APPRECIATION FOR
                                              INDIVIDUAL GRANTS                             OPTION TERM
                          ----------------------------------------------------------   ---------------------
(A)                           (B)            (C)            (D)             (E)           (F)         (G)
- ---                       ------------   ------------   ------------   -------------   ---------   ---------
                                          PERCENT OF
                           NUMBER OF        TOTAL
                           SECURITIES    OPTIONS/SARS
                           UNDERLYING     GRANTED TO    EXERCISE OR
                          OPTIONS/SARS   EMPLOYEES IN    BASE PRICE     EXPIRATION
NAME                      GRANTED (#)    FISCAL YEAR     ($/SHARE)         DATE         5% ($)      10% ($)
- ----                      ------------   ------------   ------------   -------------   ---------   ---------
<S>                       <C>            <C>            <C>            <C>             <C>         <C>
Dennis S. Hudson, Jr....     --             --             --               N/A           N/A         N/A
Dale M. Hudson..........     --             --             --               N/A           N/A         N/A
Dennis S. Hudson, III...      6,000         12.77%         $21.75      June 18, 2006    $ 82,080     207,960
A. Douglas Gilbert......      6,000         12.77           21.75      June 18, 2006      82,080     207,960
C. William Curtis,
  Jr....................     11,000         23.40           21.75      June 18, 2006     150,480     381,260
William R. Hahl.........      4,000          8.51           21.75      June 18, 2006      54,720     138,640
</TABLE>
 
                    AGGREGATED OPTION/SAR EXERCISES IN 1996
                      AND 1996 YEAR-END OPTION/SAR VALUES
 
     The following table shows stock options exercised by the named executive
officers during 1996, including the aggregate value of gains on the date of
exercise. In addition, this table includes the number of shares covered by both
exercisable and non-exercisable options as of December 31, 1996. Also reported
are the values for "in-the-money" options, which represent the positive spread
between the exercise price of any such existing options and the year-end price
of Seacoast's Class A Stock. No SARs were outstanding in 1996.
 
<TABLE>
<CAPTION>
(A)                                              (B)         (C)            (D)                (E)
- ---                                          -----------   --------   ----------------   ----------------
                                                                                             VALUE OF
                                                                         NUMBER OF         UNEXERCISED
                                                                        UNEXERCISED        IN-THE-MONEY
                                                                      OPTIONS/SARS AT    OPTIONS/SARS AT
                                                                         FY-END(#)          FY-END($)
                                               SHARES                 ----------------   ----------------
                                              ACQUIRED      VALUE     EXERCISABLE(E)/    EXERCISABLE(E)/
                   NAME                      ON EXERCISE   REALIZED   UNEXERCISABLE(U)   UNEXERCISABLE(U)
                   ----                      -----------   --------   ----------------   ----------------
<S>                                          <C>           <C>        <C>                <C>
Dennis S. Hudson, Jr.......................        --            --            --(E)               --(E)
                                                                               --(U)               --(U)
Dale M. Hudson.............................        --            --            --(E)               --(E)
                                                                               --(U)               --(U)
Dennis S. Hudson, III......................        --            --        27,000(E)         $310,250(E)
                                                                           18,000(U)          121,000(U)
A. Douglas Gilbert.........................    10,000      $100,000        17,000(E)          160,250(E)
                                                                           18,000(U)          121,000(U)
C. William Curtis, Jr......................        --            --            --(E)               --(E)
                                                                           11,000(U)           46,750(U)
William R. Hahl............................     8,000        82,325        14,000(E)          131,166(E)
                                                                           14,000(U)           96,584(U)
</TABLE>
 
PROFIT SHARING PLAN
 
     Seacoast's Retirement Savings Plan for Employees of the First National Bank
& Trust Company of the Treasure Coast was amended and restated effective January
1, 1993, in connection with the freeze of the Pension Plan. Herein, such amended
and restated plan is referred to as the "Profit Sharing Plan." The Profit
Sharing Plan has various features, including an employer matching contribution
for salary deferrals of up to 4% of the employee's compensation for each
calendar quarter. A retirement contribution is made on an annual
 
                                       59
<PAGE>   74
 
discretionary basis by Seacoast of 2% of "retirement eligible compensation," as
defined in the Profit Sharing Plan. At the end of each plan year, Seacoast's
Board of Directors decides whether to make a profit sharing contribution for the
plan year and each participant receives a contribution based upon "eligible
compensation," as defined in the Profit Sharing Plan. At least 50% of this
contribution (the "non-elective profit sharing contribution") must be kept in an
investment fund, and the balance may be deferred and left in the Profit Sharing
Plan and directed into available investment funds or taken in cash by the
employee. Seacoast contributes on a dollar-for-dollar matching basis, on the
elective profit sharing contribution that is left in the Profit Sharing Plan. In
addition, the Profit Sharing Plan has a Code Section 401(k) feature that allows
employees to make "salary savings contributions" ranging from 1% to 18% of
compensation (as defined by the Plan), subject to federal income tax
limitations. After-tax contributions may also be made by employees with
"voluntary contributions" of up to 10% of compensation (as defined in the Profit
Sharing Plan for each plan year), subject to certain statutory limitations.
 
                               PERFORMANCE GRAPH
 
     The following line-graph compares the cumulative, total return on
Seacoast's Class A Stock from December 31, 1991 to December 31, 1996, with that
of the Nasdaq Composite Index (an average of all stocks traded on the Nasdaq
Stock Market) and the Nasdaq Bank Stock index (an average of all bank and thrift
institutions whose stock is traded on the Nasdaq Stock Market). Cumulative,
total return represents the change in stock price and the amount of dividends
received over the indicated period, assuming the reinvestment of dividends.
 
<TABLE>
<CAPTION>
        Measurement Period                               NASDAQ Stock        NASDAQ Bank
      (Fiscal Year Covered)             Seacoast             Index             Stocks
<S>                                 <C>                <C>                <C>
1991                                              100                100                100
1992                                           147.90             115.45             152.02
1993                                           174.98             132.49             196.67
1994                                           177.45             128.25             198.84
1995                                           236.14             179.44             287.95
1996                                           290.33             220.18             363.26
</TABLE>
 
EMPLOYMENT AND SEVERANCE AGREEMENTS
 
     FNB entered into an executive employment agreement with A. Douglas Gilbert
on March 22, 1991. A similar agreement was entered into with Dennis S. Hudson,
III on January 18, 1994 and with C. William Curtis, Jr. on July 31, 1995. Each
such agreement has a three-year term and provides for automatic renewal on an
annual basis at the end of that term; provided, however, that either the
employee or FNB may prevent
 
                                       60
<PAGE>   75
 
such automatic renewal by giving written notice to that effect not less than 90
days prior to the end of the agreement's then current term. Each such agreement
contains certain non-competition, non-disclosure and non-solicitation covenants.
 
     These employment agreements also provide for a base salary,
hospitalization, insurance, long term disability and life insurance in
accordance with FNB's insurance plans for senior management, and reasonable club
dues. Each executive subject to these contracts may also receive other
compensation including bonuses, and the executives will be entitled to
participate in all current and future employee benefit plans and arrangements in
which senior management of FNB may participate. The agreements provide for
termination of the employee for cause, including willful and continued failure
to perform the assigned duties, crimes, breach of FNB's Code of Ethics, and also
upon death or permanent disability of the executive. Each agreement contains a
Change in Control provision which provides in the event of a "change in control"
including the acquisition of FNB or Seacoast in a merger, consolidation or
similar transaction, the acquisition of 51% or more of the voting power of any
one or all classes of Common Stock, the sale of all or substantially all of the
assets, and certain other changes in share ownership, will constitute a "change
in control" which would allow the executive to terminate the contract within one
year following the date of such change in control. Termination may also be
permitted by the executive in the event of a change in duties and powers,
customarily associated with the office designated in such contract. Upon any
such termination following a change in control, the executive's base salary,
hospitalization and other health benefits will continue for two years.
 
       SALARY AND BENEFITS COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
     Messrs. Crary (Chairman), Bruner, Dennis S. Hudson, Jr. and Santarsiero and
Ms. Monroe are the members of the Salary and Benefits Committee. None of Messrs.
Crary, Bruner or Santarsiero nor Ms. Monroe is an officer or employee of
Seacoast or its subsidiaries. Mr. Hudson has served as Chairman of the Board of
Seacoast since 1990; he served as Chief Executive Officer of Seacoast from 1983
until 1992 and President of Seacoast from 1983 until 1990. See "ELECTION OF
DIRECTORS".
 
     James H. Bruner, a Seacoast Director Emeritus and the father of Jeffrey C.
Bruner, a director of Seacoast and FNB, is a controlling shareholder of Mayfair
Investments, which leases to FNB 20,000 square feet of space adjacent to the
First National Center in Stuart, Florida pursuant to a lease which expires in
May 1997. At the end of the lease term, FNB has the option to extend the lease
for a five year period. FNB paid rent of $205,631 on this property in 1996.
Seacoast believes the terms of this lease are commercially reasonable and
comparable to rental terms for similar property in Stuart.
 
     Evans Crary, Jr., a director of Seacoast and FNB, and Chairman of FNB's
Executive Committee and Seacoast's Salary and Benefits Committee, is a
semi-retired member of Crary, Buchanan, Bowdish, Bovie, Lord, Roby & Evans,
Chartered ("Crary, Buchanan"), a law firm in Stuart, Florida. Crary, Buchanan,
general counsel to FNB, performed various legal services for Seacoast and FNB
during the fiscal year ended December 31, 1996.
 
                CERTAIN TRANSACTIONS AND BUSINESS RELATIONSHIPS
 
     Several of Seacoast's directors, executive officers and their affiliates,
including corporations and firms of which they are directors or officers or in
which they and/or their families have an ownership interest, are customers of
Seacoast and its subsidiaries. These persons, corporations and firms have had
transactions in the ordinary course of business with Seacoast and its
subsidiaries, including borrowings, all of which, in the opinion of Seacoast
management, were on substantially the same terms including interest rates and
collateral as those prevailing at the time for comparable transactions with
unaffiliated persons and did not involve more than the normal risk of
collectibility or present other unfavorable features. Seacoast and its
subsidiaries expect to have such transactions on similar terms with its
directors, executive officers, and their affiliates in the future. The aggregate
amount of loans outstanding by FNB to directors, executive officers, and related
parties of
 
                                       61
<PAGE>   76
 
Seacoast or FNB as of December 31, 1996, was approximately $2,510,670, which
represented approximately 3.76% of the consolidated shareholders' equity on that
date.
 
     For information concerning specific transactions and business relationships
between Seacoast or FNB and certain of its directors or executive officers, see
"-- Salary and Benefits Committee Interlocks and Insider Participation."
 
                             PRINCIPAL SHAREHOLDERS
 
   
     As of February 24, 1997, the only shareholders known to Seacoast to be the
beneficial owners, as defined by Securities and Exchange Commission rules, of
more than 5% of the outstanding shares of Seacoast Class A Stock or Class B
Stock, were the following, for whom beneficial ownership information is set
forth in the following table.
    
 
   
<TABLE>
<CAPTION>
                                                                NUMBER AND        NUMBER AND
                                                                PERCENT OF        PERCENT OF
                                                               CLASS A STOCK     CLASS B STOCK
                                                               BENEFICIALLY      BENEFICIALLY
                                                                   OWNED             OWNED
                                                              ---------------   ---------------
NAME AND ADDRESS OF BENEFICIAL OWNER                          NUMBER      %     NUMBER      %
- ------------------------------------                          -------   -----   -------   -----
<S>                                                           <C>       <C>     <C>       <C>
Dale M. Hudson(1)...........................................  440,804   11.17   154,151   40.08
  192 S.E. Harbor Point Drive
  Stuart, FL 34996
Dennis S. Hudson, Jr.(1)....................................  310,039    7.85   125,753   32.69
  157 S. River Road
  Stuart, FL 34996
First Union Corporation(2)..................................  222,750    5.92        --      --
  One First Union Center
  Charlotte, North Carolina 28288
</TABLE>
    
 
- ---------------
 
(1) Dennis S. Hudson, Jr. and Dale M. Hudson are brothers.
   
(2) First Union Corporation ("First Union") is the parent holding company of
    Lieber & Company ("Lieber"), Evergreen Asset Management Group ("Evergreen"),
    First Union National Bank, First Union National Bank of Florida and First
    Union National Bank of Connecticut. Lieber and Evergreen are corporations
    which are investment advisors for mutual funds and other clients; the
    securities reported by these subsidiaries are beneficially owned by such
    mutual funds or other clients. The other First Union entities listed above
    hold the securities reported in a fiduciary capacity for their respective
    customers. Of the shares beneficially owned, First Union reports it has sole
    voting power as to 161,650 shares and sole dispositive power as to 222,550
    shares. The information regarding First Union, including the number and
    percent of Seacoast Class A Stock beneficially owned, is based solely upon a
    Schedule 13G dated February 3, 1997 and filed by First Union with respect to
    Seacoast Class A Stock beneficially owned as of December 31, 1996.
    
 
                                       62
<PAGE>   77
 
                 AMENDMENTS TO SEACOAST'S ARTICLES OF INCORPORATION
 
     Seacoast's Articles of Incorporation currently provide for supermajority
two-third votes of (i) the holders of Class A Stock and (ii) holders of Class A
Stock and Class B Stock voting as a single class in connection with business
combinations, including possible acquisitions by Seacoast. Seacoast shareholders
are required by the NASD to vote upon the Merger, even if the Articles of
Incorporation did not require a shareholder vote. To clarify these provisions in
the Articles and to permit Seacoast to acquire other institutions without a vote
of its shareholders under the Articles, the Board is proposing amendments to
Article XI of Seacoast's Articles of Incorporation. These Amendments continue to
require the same supermajority votes of Seacoast shareholders with respect to
business combinations, subject to newly added exceptions permitting Seacoast to
acquire other persons or entities without a supermajority vote of its
shareholders. These proposed changes are intended to facilitate and give
certainty to Seacoast's acquisition process and to avoid the expense of
shareholder meetings not required by the FBCA or the NASD. These amendments
clarify Article XI, but revised Article XI does not expand any existing
restrictions on business combinations. Article XI, as amended, may continue to
discourage persons from attempting to acquire Seacoast.
 
     A copy of the proposed Article XI, as revised, is reproduced as Appendix V
hereto, and incorporated herein by reference.
 
     SEACOAST'S BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE "FOR" THIS
PROPOSAL TO AMEND ARTICLE XI OF SEACOAST'S ARTICLES OF INCORPORATION.
 
          RATIFICATION OF APPOINTMENT OF SEACOAST INDEPENDENT AUDITORS
 
     The Seacoast Board of Directors, upon the recommendation of the Audit
Committee, has appointed Arthur Andersen LLP, independent certified public
accountants, as independent auditors for Seacoast and its subsidiaries for the
current fiscal year ending December 31, 1997, subject to ratification by the
Seacoast shareholders. Arthur Andersen LLP has served as independent auditors
for Seacoast and its subsidiaries since August 20, 1991. Arthur Andersen LLP has
advised Seacoast that neither the firm nor any of its partners has any direct or
material interest in Seacoast and its subsidiaries except as auditors and
independent certified public accountants of Seacoast and its subsidiaries.
 
     A representative of Arthur Andersen LLP will be present at the Meeting and
will be given the opportunity to make a statement on behalf of the firm if he so
desires. A representative of Arthur Andersen LLP is also expected to respond to
appropriate questions from shareholders.
 
     All shares represented by valid Proxies received pursuant to this
solicitation and not revoked before they are exercised will be voted in the
manner specified therein. If no specification is made, the Proxies will be voted
for the ratification of the appointment of Arthur Andersen LLP for the fiscal
year ending December 31, 1997.
 
     The affirmative vote of the holders of shares of Common Stock representing
a majority of the votes represented at the Meeting, at which a quorum is
present, is required to ratify the appointment of Arthur Andersen LLP as
independent auditors.
 
     THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE FOR RATIFICATION OF
THE APPOINTMENT OF ARTHUR ANDERSEN LLP AS INDEPENDENT AUDITORS FOR THE FISCAL
YEAR ENDING DECEMBER 31, 1997.
 
            SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE
 
     Seacoast is required to identify each director or officer who failed to
file timely with the Securities and Exchange Commission a required report
relating to ownership and changes in ownership of Seacoast's securities. Mr.
William R. Hahl, an executive officer of FNB, failed to report on a timely basis
his purchase of 3,100 shares of Seacoast Class A Stock at the then market price
of $          per share on July 19, 1996. This transaction has subsequently been
reported on a Form 5 filed on February 26, 1997. Based on material
 
                                       63
<PAGE>   78
 
provided to Seacoast, Seacoast believes that all other such filing requirements
with respect to Seacoast's fiscal year ended December 31, 1996 were complied
with.
 
                 SHAREHOLDER PROPOSALS FOR 1998 ANNUAL MEETING
 
     Proposals of shareholders of Seacoast intended to be presented at the 1998
Annual Meeting of Shareholders must be received by Seacoast at its principal
executive offices on or before             , 1997, in order to be included in
Seacoast's Proxy Statement and Proxy relating to the 1998 Annual Meeting of
Shareholders. Only proper proposals which are timely received will be included
in the Proxy Statement and Proxy.
 
                                 OTHER MATTERS
 
     Management of Seacoast does not know of any matters to be brought before
the Seacoast Annual Meeting other than those described above. If any other
matters properly come before the Seacoast Annual Meeting, the persons designated
as Proxies will vote on such matters in accordance with their best judgment.
Management of PSHC does not know of any matters to be brought before the PSHC
Special Meeting other than those described above. If any other matters properly
come before the PSHC Special Meeting, the persons designated as Proxies will
vote on such matters in accordance with their best judgment.
 
                               OTHER INFORMATION
 
PROXY SOLICITATION COSTS
 
     The costs of preparing this Proxy Statement/Prospectus will be split by
Seacoast and PSHC. The costs of soliciting Proxies for the Seacoast Annual
Meeting and the PSHC Special Meeting will be paid by Seacoast and PSHC,
respectively. In addition to the solicitation of shareholders of record by mail,
telephone, facsimile or personal contact, Seacoast and PSHC will be contacting
brokers, dealers, banks, or voting trustees or their nominees who can be
identified as record holders of Seacoast Common Stock or PSHC Common Stock,
respectively; such holders, after inquiry by Seacoast or PSHC, as applicable,
will provide information concerning quantities of proxy materials and 1996
Annual Reports needed to supply such information to beneficial owners, and
Seacoast or PSHC, as applicable will reimburse them for the reasonable expense
of mailing proxy materials and 1996 Annual Reports to such persons.
 
                                    EXPERTS
 
     The consolidated financial statements of Seacoast, incorporated by
reference in this Registration Statement, have been audited by Arthur Andersen
LLP, independent certified public accountants, for the periods indicated in
their report thereon which is included in the Seacoast Annual Report to
Shareholders which is incorporated by reference in its Annual Report on Form
10-K for the year ended December 31, 1996. The financial statements audited by
Arthur Andersen LLP have been incorporated herein by reference in reliance upon
the authority of said firm as experts in accounting and auditing in giving said
reports.
 
     The financial statements of PSHC as of December 31, 1996 and 1995, and for
each of the years in the three-year period ended December 31, 1996, have been
incorporated by reference herein and in the Registration Statement in reliance
upon the report of KPMG Peat Marwick LLP, independent certified public
accountants, incorporated by reference herein and upon the authority of said
firm as experts in accounting and auditing. The report of KPMG Peat Marwick LLP
refers to a change, in 1995, in the accounting for mortgage servicing rights to
conform with Statement of Financial Accounting Standards No. 122.
 
                                    OPINIONS
 
     The legality of the shares of Seacoast Class A Stock to be issued in the
Merger and certain tax consequences of the Merger will be passed upon by Alston
& Bird LLP, Atlanta, Georgia.
 
                                       64
<PAGE>   79
 
                                                                      APPENDIX I
 
                          AGREEMENT AND PLAN OF MERGER
 
                                 BY AND BETWEEN
 
                    SEACOAST BANKING CORPORATION OF FLORIDA
 
                                      AND
 
                   PORT ST. LUCIE NATIONAL BANK HOLDING CORP.
 
                         DATED AS OF FEBRUARY 19, 1997
 
                                       A-1
<PAGE>   80
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>          <C>                                                           <C>
Parties..................................................................
Preamble.................................................................
ARTICLE 1 -- TRANSACTIONS AND TERMS OF MERGER............................
      1.1    Merger......................................................
      1.2    Time and Place of Closing...................................
      1.3    Effective Time..............................................
      1.4    Bank Merger.................................................
ARTICLE 2 -- TERMS OF MERGER.............................................
      2.1    Charter.....................................................
      2.2    Bylaws......................................................
      2.3    Directors and Officers......................................
ARTICLE 3 -- MANNER OF CONVERTING SHARES.................................
      3.1    Conversion of Shares........................................
      3.2    Anti-Dilution Provisions....................................
      3.3    Shares Held by PSHC or Seacoast.............................
      3.4    Dissenting Shareholders.....................................
      3.5    Fractional Shares...........................................
      3.6    Conversion of Stock Options; Restricted Stock...............
ARTICLE 4 -- EXCHANGE OF SHARES..........................................
      4.1    Exchange Procedures.........................................
      4.2    Rights of Former PSHC Shareholders..........................
ARTICLE 5 -- REPRESENTATIONS AND WARRANTIES OF PSHC......................
      5.1    Organization, Standing, and Power...........................
      5.2    Authority of PSHC; No Breach By Agreement...................
      5.3    Capital Stock...............................................
      5.4    PSHC Subsidiaries...........................................
      5.5    SEC Filings; Financial Statements...........................
      5.6    Absence of Undisclosed Liabilities..........................
      5.7    Absence of Certain Changes or Events........................
      5.8    Tax Matters.................................................
      5.9    Allowance for Possible Loan Losses..........................
      5.10   Assets......................................................
      5.11   Intellectual Property.......................................
      5.12   Environmental Matters.......................................
      5.13   Compliance with Laws........................................
      5.14   Labor Relations.............................................
      5.15   Employee Benefit Plans......................................
      5.16   Material Contracts..........................................
      5.17   Legal Proceedings...........................................
      5.18   Reports.....................................................
      5.19   Statements True and Correct.................................
      5.20   Accounting, Tax and Regulatory Matters......................
      5.21   State Takeover Laws.........................................
      5.22   Charter Provisions..........................................
      5.23   Opinion of Financial Advisor................................
      5.24   Board Recommendation........................................
</TABLE>
 
                                       A-2
<PAGE>   81
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>          <C>                                                           <C>
ARTICLE 6 -- REPRESENTATIONS AND WARRANTIES OF Seacoast..................
      6.1    Organization, Standing, and Power...........................
      6.2    Authority; No Breach By Agreement...........................
      6.3    Capital Stock...............................................
      6.4    Seacoast Subsidiaries.......................................
      6.5    SEC Filings; Financial Statements...........................
      6.6    Absence of Undisclosed Liabilities..........................
      6.7    Absence of Certain Changes or Events........................
      6.9    Allowance for Possible Loan Losses..........................
      6.10   Assets......................................................
      6.11   Intellectual Property.......................................
      6.12   [Reserved]..................................................
      6.13   Compliance With Laws........................................
      6.14   Legal Proceedings...........................................
      6.15   Reports.....................................................
      6.16   Statements True and Correct.................................
      6.17   Accounting, Tax and Regulatory Matters......................
ARTICLE 7 -- CONDUCT OF BUSINESS PENDING CONSUMMATION....................
      7.1    Affirmative Covenants of PSHC...............................
      7.2    Negative Covenants of PSHC..................................
      7.3    Covenants of Seacoast.......................................
      7.4    Adverse Changes in Condition................................
      7.5    Reports.....................................................
ARTICLE 8 -- ADDITIONAL AGREEMENTS.......................................
             Registration Statement; Proxy Statement; Shareholder
      8.1    Approval....................................................
      8.2    Nasdaq Listing..............................................
      8.3    Applications................................................
      8.4    Filings with State Offices..................................
      8.5    Agreement as to Efforts to Consummate.......................
      8.6    Investigation and Confidentiality...........................
      8.7    Press Releases..............................................
      8.8    Certain Actions.............................................
      8.9    Accounting and Tax Treatment................................
      8.10   State Takeover Laws.........................................
      8.11   Charter Provisions..........................................
      8.12   PSHC Meetings...............................................
      8.13   Agreements of Affiliates....................................
      8.14   Employee Benefits and Contracts.............................
      8.15   Indemnification.............................................
      8.16   Certain Policies of PSHC....................................
      8.17   Nomination and Election of Directors........................
ARTICLE 9 -- CONDITIONS PRECEDENT TO OBLIGATIONS TO CONSUMMATE...........
      9.1    Conditions to Obligations of Each Party.....................
      9.2    Conditions to Obligations of Seacoast.......................
      9.3    Conditions to Obligations of PSHC...........................
ARTICLE 10 -- TERMINATION................................................
     10.1    Termination.................................................
     10.2    Effect of Termination.......................................
     10.3    Non-Survival of Representations and Covenants...............
</TABLE>
 
                                       A-3
<PAGE>   82
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>          <C>                                                           <C>
ARTICLE 11 -- MISCELLANEOUS..............................................
     11.1    Definitions.................................................
     11.2    Expenses....................................................
     11.3    Brokers and Finders.........................................
     11.4    Entire Agreement............................................
     11.5    Amendments..................................................
     11.6    Waivers.....................................................
     11.7    Assignment..................................................
     11.8    Notices.....................................................
     11.9    Governing Law...............................................
     11.10   Counterparts................................................
     11.11   Captions; Articles and Sections.............................
     11.12   Interpretations.............................................
     11.13   Enforcement of Agreement....................................
     11.14   Severability................................................
Signatures
</TABLE>
 
                                       A-4
<PAGE>   83
 
   
                          EXHIBITS TO MERGER AGREEMENT
    
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER         DESCRIPTION
- -------        -----------
<C>       <C>  <S>
   1.      --  Bank Plan of Merger. (sec. 1.4).
               Form of agreement of affiliates of PSHC. (sec.sec. 8.13,
   2.      --  9.2(g)).
               Matters as to which Gunster, Yoakley, Valdes-Fauli &
   3.      --  Stewart, P.A. will opine. (sec. 9.2(d)).
   4.      --  Form of Director's Agreement. (sec. 9.2(h)).
   5.      --  Claims Letter. (sec. 9.2(i)).
   6.      --  Matters as to which Alston & Bird will opine. (sec. 9.3(d)).
</TABLE>
 
                                       A-5
<PAGE>   84
 
                          AGREEMENT AND PLAN OF MERGER
 
     THIS AGREEMENT AND PLAN OF MERGER (this "Agreement") is made and entered
into as of February 19, 1997, by and between SEACOAST BANKING CORPORATION OF
FLORIDA ("Seacoast"), a Florida corporation, and PORT ST. LUCIE NATIONAL BANK
HOLDING CORP. ("PSHC"), a Florida corporation.
 
                                    PREAMBLE
 
     The respective Boards of Directors of PSHC and Seacoast are of the opinion
that the transactions described herein are in the best interests of the parties
to this Agreement and their respective shareholders. This Agreement provides for
the acquisition of PSHC by Seacoast pursuant to the merger of PSHC with and into
Seacoast. At the effective time of such merger, the outstanding shares of the
capital stock of PSHC shall be converted into the right to receive shares of the
common stock of Seacoast (except as provided herein). As a result, shareholders
of PSHC shall become shareholders of Seacoast and Seacoast shall continue to
conduct the business and operations of PSHC. The transactions described in this
Agreement are subject to the approvals of the shareholders of PSHC, the
shareholders of Seacoast, the Board of Governors of the Federal Reserve System,
and the Office of the Comptroller of the Currency, and the satisfaction of
certain other conditions described in this Agreement. It is the intention of the
parties to this Agreement that the Merger for federal income tax purposes shall
qualify as a "reorganization" within the meaning of Section 368(a) of the
Internal Revenue Code, and for accounting purposes shall qualify for treatment
as a pooling of interests.
 
     Certain terms used in this Agreement are defined in Section 11.1 of this
Agreement.
 
     NOW, THEREFORE, in consideration of the above and the mutual warranties,
representations, covenants, and agreements set forth herein, the parties,
intending to be legally bound, agree as follows:
 
                                   ARTICLE 1
 
                        TRANSACTIONS AND TERMS OF MERGER
 
     1.1 Merger.  Subject to the terms and conditions of this Agreement, at the
Effective Time, PSHC shall be merged with and into Seacoast in accordance with
the provisions of, and with the effect provided in Sections 607.1101, 607.1103,
607.1105, 607.1106 and 607.1107 of the FBCA (the "Merger"). Seacoast shall be
the Surviving Corporation resulting from the Merger and shall continue to be
governed by the Laws of the State of Florida. The Merger shall be consummated
pursuant to the terms of this Agreement, which has been approved and adopted by
the respective Boards of Directors of PSHC and Seacoast.
 
     1.2 Time and Place of Closing.  The closing of the transactions
contemplated hereby (the "Closing") will take place at 9:00 A.M. on the date
that the Effective Time occurs (or the immediately preceding day if the
Effective Time is earlier than 9:00 A.M.), or at such other time as the Parties,
acting through their authorized officers, may mutually agree. The Closing shall
be held at such location as may be mutually agreed upon by the Parties.
 
     1.3 Effective Time.  The Merger and other transactions contemplated by this
Agreement shall become effective on the date and at the time the Articles of
Merger reflecting the Merger shall become effective with the Secretary of State
of the State of Florida (the "Effective Time"). Subject to the terms and
conditions hereof, unless otherwise mutually agreed upon in writing by the
authorized officers of each Party, the Parties shall use their reasonable
efforts to cause the Effective Time to occur on the first business day following
the last to occur of (i) the effective date (including expiration of any
applicable waiting period) of the last required Consent of any Regulatory
Authority having authority over and approving or exempting the Merger, and (ii)
the date on which the shareholders of PSHC and Seacoast approve this Agreement
to the extent such approval is required by applicable Law; or such later date
within 30 days thereof as may be mutually agreed upon by Seacoast and PSHC.
 
                                       A-6
<PAGE>   85
 
     1.4 Bank Merger.  After consummation of the Merger, PSN Bank shall (at
Seacoast's discretion) be merged with and into First National (the "Bank
Merger") in accordance with the provisions of and with the effect provided in 12
U.S.C. 215a on terms and subject to the provisions of the Bank Plan of Merger
("Bank Plan"), attached hereto as Exhibit 1. The Bank Plan shall be executed and
the transactions contemplated therein shall be consummated at such time as
Seacoast directs. PSHC shall vote all shares of capital stock of PSN Bank in
favor of the Bank Plan and the Bank Merger provided therein.
 
                                   ARTICLE 2
 
                                TERMS OF MERGER
 
     2.1 Charter.  The Articles of Incorporation of Seacoast in effect
immediately prior to the Effective Time shall be the Articles of Incorporation
of the Surviving Corporation until duly amended or repealed.
 
     2.2 Bylaws.  The Bylaws of Seacoast in effect immediately prior to the
Effective Time shall be the Bylaws of the Surviving Corporation until duly
amended or repealed.
 
     2.3 Directors and Officers.  The directors of Seacoast in office
immediately prior to the Effective Time, together with two such additional
persons from PSHC's Board of Directors as may thereafter be elected, shall serve
as the directors of the Surviving Corporation from and after the Effective Time
in accordance with the Bylaws of the Surviving Corporation. The officers of
Seacoast in office immediately prior to the Effective Time, together with such
additional persons as may thereafter be elected, shall serve as the officers of
the Surviving Corporation from and after the Effective Time in accordance with
the Bylaws of the Surviving Corporation.
 
                                   ARTICLE 3
 
                          MANNER OF CONVERTING SHARES
 
     3.1 Conversion of Shares.  Subject to the provisions of this Article 3, at
the Effective Time, by virtue of the Merger and without any action on the part
of Seacoast, PSHC, or the shareholders of either of the foregoing, the shares of
the constituent corporations shall be converted as follows:
 
          (a) Each share of capital stock of Seacoast issued and outstanding
     immediately prior to the Effective Time shall remain issued and outstanding
     from and after the Effective Time.
 
          (b) Each share of PSHC Common Stock, excluding shares held by any PSHC
     Entity or any Seacoast Entity, in each case other than in a fiduciary
     capacity or as a result of debts previously contracted, and excluding
     shares held by shareholders who perfect their statutory dissenters' rights
     as provided in Section 3.4 issued and outstanding immediately prior to the
     Effective Time shall cease to be outstanding and shall be converted into
     and exchanged for the right to receive shares of Seacoast Common Stock in
     an amount equal to the Purchase Price Per Share divided by the Seacoast
     Stock Price (the "Exchange Ratio"); provided, that, in the event that the
     Purchase Price Per Share shall be less than $24.62 (the "Lower Threshold
     Price") then PSHC shall have the right to terminate the Agreement.
 
          (c) Each issued and outstanding PSHC Warrant shall be converted into
     and exchanged for shares of Seacoast Common Stock based upon the exchange
     ratio (the "Warrant Exchange Ratio") obtained by dividing (i) the
     difference between the Purchase Price Per Share and $8.26 by (ii) the
     Seacoast Stock Price.
 
     3.2 Anti-Dilution Provisions.  In the event Seacoast changes the number of
shares of Seacoast Common Stock issued and outstanding prior to the Effective
Time as a result of a stock split, stock dividend, or similar recapitalization
with respect to such stock and the record date therefor (in the case of a stock
dividend) or the effective date thereof (in the case of a stock split or similar
recapitalization for which a record date is not established) shall be prior to
the Effective Time, the Exchange Ratio and the Warrant Exchange Ratio shall be
proportionately adjusted. In the event Seacoast changes the number of shares of
Seacoast Common Stock issued and outstanding prior to the Effective Time as a
result of a stock split, stock dividend, or similar
 
                                       A-7
<PAGE>   86
 
recapitalization with respect to such stock and the record date therefor (in the
case of a stock dividend) or the effective date thereof (in the case of a stock
split or similar recapitalization for which a record date is not established)
shall be after the Exchange Ratio and the Warrant Exchange Ratio have been
determined in accordance with Sections 3.1(b) and (c) and prior to the Effective
Time, the Exchange Ratio and Warrant Exchange Ratio shall be proportionately
adjusted. In the event Seacoast changes the number of shares of Seacoast Common
Stock issued and outstanding prior to the Effective Time as a result of a stock
split, stock dividend, or similar recapitalization with respect to such stock
and the record date therefor (in the case of a stock dividend) or the effective
date thereof (in the case of a stock split or similar recapitalization for which
a record date is not established) shall be prior to date on which the Exchange
Ratio and the Warrant Exchange Ratio is determined in accordance with Sections
3.1(b) and (c), (i) the Threshold Prices shall be adjusted appropriately, and
(ii) if necessary, the anticipated Effective Time shall be postponed for an
appropriate period of time agreed upon by the parties in order for the Seacoast
Stock Price to reflect the market effect of such stock split, stock dividend, or
similar recapitalization.
 
     3.3 Shares Held by PSHC or Seacoast.  Each of the shares of PSHC Common
Stock held by any PSHC Entity or by any Seacoast Entity, in each case other than
in a fiduciary capacity or as a result of debts previously contracted, shall be
canceled and retired at the Effective Time and no consideration shall be issued
in exchange therefor.
 
     3.4 Dissenting Shareholders.  Any holder of shares of PSHC Common Stock who
perfects his dissenters' rights in accordance with and as contemplated by
Section 607.1301 et seq. of the FBCA shall be entitled to receive the value of
such shares in cash as determined pursuant to such provision of Law; provided,
that no such payment shall be made to any dissenting shareholder unless and
until such dissenting shareholder has complied with the applicable provisions of
the FBCA and surrendered to PSHC the certificate or certificates representing
the shares for which payment is being made. In the event that after the
Effective Time a dissenting shareholder of PSHC fails to perfect, or effectively
withdraws or loses, his right to appraisal and of payment for his shares subject
to Seacoast's consent in its sole discretion, Seacoast shall issue and deliver
the consideration to which such holder of shares of PSHC Common Stock is
entitled under this Article 3 (without interest) upon surrender by such holder
of the certificate or certificates representing shares of PSHC Common Stock held
by him.
 
     3.5 Fractional Shares.  Notwithstanding any other provision of this
Agreement, each holder of shares of PSHC Common Stock exchanged pursuant to the
Merger who would otherwise have been entitled to receive a fraction of a share
of Seacoast Common Stock (after taking into account all certificates delivered
by such holder) shall receive, in lieu thereof, cash (without interest) in an
amount equal to such fractional part of a share of Seacoast Common Stock
multiplied by the Seacoast Stock Price. No such holder will be entitled to
dividends, voting rights, or any other rights as a shareholder in respect of any
fractional shares.
 
     3.6 Conversion of Stock Options; Restricted Stock.  (a) At the Effective
Time, each option or other Equity Right (excluding PSHC Warrants) to purchase
shares of PSHC Common Stock pursuant to stock options or stock appreciation
rights ("PSHC Options") granted by PSHC under the PSHC Stock Plan[s], which are
outstanding at the Effective Time, whether or not exercisable, shall be
converted into and become rights with respect to Seacoast Common Stock, and
Seacoast shall assume each PSHC Option, in accordance with the terms of the PSHC
Stock Plan and stock option agreement by which it is evidenced, except that from
and after the Effective Time, (i) Seacoast and its Compensation Committee shall
be substituted for PSHC and the Committee of PSHC's Board of Directors
(including, if applicable, the entire Board of Directors of PSHC) administering
such PSHC Stock Plan, (ii) each PSHC Option assumed by Seacoast may be exercised
solely for shares of Seacoast Common Stock (or cash, if so provided under the
terms of such PSHC Option), (iii) the number of shares of Seacoast Common Stock
subject to such PSHC Option shall be equal to the number of shares of PSHC
Common Stock subject to such PSHC Option immediately prior to the Effective Time
multiplied by the Exchange Ratio, and (iv) the per share exercise price under
each such PSHC Option shall be adjusted by dividing the per share exercise price
under each such PSHC Option by the Exchange Ratio and rounding up to the nearest
cent. Notwithstanding the provisions of clause (iii) of the preceding sentence,
Seacoast shall not be obligated to issue any fraction of a share of Seacoast
Common Stock upon exercise of PSHC Options and any fraction of a share of
Seacoast Common Stock that otherwise would
 
                                       A-8
<PAGE>   87
 
be subject to a converted PSHC Option shall represent the right to receive a
cash payment upon exercise of such converted PSHC Option equal to the product of
such fraction and the difference between the market value of one share of
Seacoast Common Stock at the time of exercise of such Option and the per share
exercise price of such Option. The market value of one share of Seacoast Common
Stock at the time of exercise of an Option shall be the last sale price of such
common stock on the Nasdaq National Market (as reported by The Wall Street
Journal or, if not reported thereby, any other authoritative source selected by
Seacoast) on the last trading day preceding the date of exercise. In addition,
notwithstanding the provisions of clauses (iii) and (iv) of the first sentence
of this Section 3.6(a), each PSHC Option which is an "incentive stock option"
shall be adjusted as required by Section 424 of the Internal Revenue Code, and
the regulations promulgated thereunder, so as not to constitute a modification,
extension or renewal of the option, within the meaning of Section 424(h) of the
Internal Revenue Code. Each of PSHC and Seacoast agrees to take all necessary
steps to effectuate the foregoing provisions of this Section 3.6, including
using its reasonable efforts to obtain from each holder of a PSHC Option any
Consent or Contract that may be deemed necessary or advisable in order to effect
the transactions contemplated by this Section 3.6. Anything in this Agreement to
the contrary notwithstanding, Seacoast shall have the right, in its sole
discretion, not to deliver the consideration provided in this Section 3.6 to a
former holder of a PSHC Option who has not delivered such Consent or Contract.
 
     (b) As soon as practicable after the Effective Time, Seacoast shall deliver
to the participants in each PSHC Stock Plan an appropriate notice setting forth
such participant's rights pursuant thereto and the grants subject to such PSHC
Stock Plan shall continue in effect on the same terms and conditions (subject to
the adjustments required by Section 3.6(a) after giving effect to the Merger),
and Seacoast shall comply with the terms of each PSHC Stock Plan to ensure, to
the extent required by, and subject to the provisions of, such PSHC Stock Plan,
that PSHC Options which qualified as incentive stock options prior to the
Effective Time continue to qualify as incentive stock options after the
Effective Time. At or prior to the Effective Time, Seacoast shall take all
corporate action necessary to reserve for issuance sufficient shares of Seacoast
Common Stock for delivery upon exercise of PSHC Options assumed by it in
accordance with this Section 3.6. As soon as practicable after the Effective
Time, Seacoast shall file a registration statement on Form S-3 or Form S-8, as
the case may be (or any successor or other appropriate forms), with respect to
the shares of Seacoast Common Stock subject to such options and shall use its
reasonable efforts to maintain the effectiveness of such registration statements
(and maintain the current status of the prospectus or prospectuses contained
therein) for so long as such options remain outstanding. With respect to those
individuals who subsequent to the Merger will be subject to the reporting
requirements under Section 16(a) of the Exchange Act, where applicable, Seacoast
shall administer the PSHC Stock Plan assumed pursuant to this Section 3.6 in a
manner that complies with Rule 16b-3 promulgated under the Exchange Act to the
extent the PSHC Stock Plan complied with such rule prior to the Effective Time.
 
     (c) All contractual restrictions or limitations on transfer with respect to
PSHC Common Stock awarded under the PSHC Stock Plans or any other plan, program,
Contract or arrangement of any PSHC Entity, to the extent that such restrictions
or limitations shall not have already lapsed (whether as a result of the Merger
or otherwise), and except as otherwise expressly provided in such plan, program,
Contract or arrangement, shall remain in full force and effect with respect to
shares of Seacoast Common Stock into which such restricted stock is converted
pursuant to Section 3.1.
 
                                   ARTICLE 4
 
                               EXCHANGE OF SHARES
 
     4.1 Exchange Procedures.  Promptly after the Effective Time, Seacoast and
PSHC shall cause the exchange agent selected by Seacoast (the "Exchange Agent")
to mail to each holder of record of a certificate or certificates which
represented shares of PSHC Common Stock immediately prior to the Effective Time
(the "Certificates") appropriate transmittal materials and instructions (which
shall specify that delivery shall be effected, and risk of loss and title to
such Certificates shall pass, only upon proper delivery of such Certificates to
the Exchange Agent). The Certificate or Certificates of PSHC Common Stock so
delivered
 
                                       A-9
<PAGE>   88
 
shall be duly endorsed as the Exchange Agent may require. In the event of a
transfer of ownership of shares of PSHC Common Stock represented by Certificates
that are not registered in the transfer records of PSHC, the consideration
provided in Section 3.1 may be issued to a transferee if the Certificates
representing such shares are delivered to the Exchange Agent, accompanied by all
documents required to evidence such transfer and by evidence satisfactory to the
Exchange Agent that any applicable stock transfer taxes have been paid. If any
Certificate shall have been lost, stolen, mislaid or destroyed, upon receipt of
(i) an affidavit of that fact from the holder claiming such Certificate to be
lost, mislaid, stolen or destroyed, (ii) such bond, security or indemnity as
Seacoast and the Exchange Agent may reasonably require and (iii) any other
documents necessary to evidence and effect the bona fide exchange thereof, the
Exchange Agent shall issue to such holder the consideration into which the
shares represented by such lost, stolen, mislaid or destroyed Certificate shall
have been converted. The Exchange Agent may establish such other reasonable and
customary rules and procedures in connection with its duties as it may deem
appropriate. After the Effective Time, each holder of shares of PSHC Common
Stock (other than shares to be canceled pursuant to Section 3.3 or as to which
statutory dissenters' rights have been perfected as provided in Section 3.4)
issued and outstanding at the Effective Time shall surrender the Certificate or
Certificates representing such shares to the Exchange Agent and shall promptly
upon surrender thereof receive in exchange therefor the consideration provided
in Section 3.1, together with all undelivered dividends or distributions in
respect of such shares (without interest thereon) pursuant to Section 4.2. To
the extent required by Section 3.5, each holder of shares of PSHC Common Stock
issued and outstanding at the Effective Time also shall receive, upon surrender
of the Certificate or Certificates, cash in lieu of any fractional share of
Seacoast Common Stock to which such holder may be otherwise entitled (without
interest). Seacoast shall not be obligated to deliver the consideration to which
any former holder of PSHC Common Stock is entitled as a result of the Merger
until such holder surrenders such holder's Certificate or Certificates for
exchange as provided in this Section 4.1. Any other provision of this Agreement
notwithstanding, neither Seacoast nor the Exchange Agent shall be liable to a
holder of PSHC Common Stock for any amounts paid or property delivered in good
faith to a public official pursuant to any applicable abandoned property,
escheat or similar Law. Adoption of this Agreement by the shareholders of PSHC
shall constitute ratification of the appointment of the Exchange Agent.
 
     4.2 Rights of Former PSHC Shareholders.  At the Effective Time, the stock
transfer books of PSHC shall be closed as to holders of PSHC Common Stock
immediately prior to the Effective Time and no transfer of PSHC Common Stock by
any such holder shall thereafter be made or recognized. Until surrendered for
exchange in accordance with the provisions of Section 4.1, each Certificate
theretofore representing shares of PSHC Common Stock (other than shares to be
canceled pursuant to Sections 3.3 and 3.4) shall from and after the Effective
Time represent for all purposes only the right to receive the consideration
provided in Sections 3.1 and 3.5 in exchange therefor, subject, however, to the
Surviving Corporation's obligation to pay any dividends or make any other
distributions with a record date prior to the Effective Time which have been
declared or made by PSHC in respect of such shares of PSHC Common Stock in
accordance with the terms of this Agreement and which remain unpaid at the
Effective Time. Whenever a dividend or other distribution is declared by
Seacoast on the Seacoast Common Stock, the record date for which is at or after
the Effective Time, the declaration shall include dividends or other
distributions on all shares of Seacoast Common Stock issuable pursuant to this
Agreement, but beginning 45 days after the Effective Time, no dividend or other
distribution payable to the holders of record of Seacoast Common Stock as of any
time subsequent to the Effective Time shall be delivered to the holder of any
Certificate until such holder surrenders such Certificate for exchange as
provided in Section 4.1. However, upon surrender of such Certificate, both the
Seacoast Common Stock certificate (together with all such undelivered dividends
or other distributions, without interest) and any undelivered dividends and cash
payments payable hereunder (without interest) shall be delivered and paid with
respect to each share represented by such Certificate.
 
                                      A-10
<PAGE>   89
 
                                   ARTICLE 5
 
                     REPRESENTATIONS AND WARRANTIES OF PSHC
 
     PSHC hereby represents and warrants to Seacoast as follows:
 
          5.1 Organization, Standing, and Power.  PSHC is a corporation duly
     organized, validly existing, and in good standing under the Laws of the
     State of Florida, and has the corporate power and authority to carry on its
     business as now conducted and to own, lease and operate its Assets. PSHC is
     duly qualified or licensed to transact business as a foreign corporation in
     good standing in the States of the United States and foreign jurisdictions
     where the character of its Assets or the nature or conduct of its business
     requires it to be so qualified or licensed, except for such jurisdictions
     in which the failure to be so qualified or licensed is not reasonably
     likely to have, individually or in the aggregate, a PSHC Material Adverse
     Effect. The minute books and other organizational documents and corporate
     records for PSHC have been made available to Seacoast for its review and,
     except as disclosed in Section 5.1 of the PSHC Disclosure Memorandum, are
     true and complete in all material respects as in effect as of the date of
     this Agreement and accurately reflect in all material respects all
     amendments thereto and all proceedings of the Board of Directors and
     shareholders thereof.
 
          5.2 Authority of PSHC; No Breach By Agreement.  (a) PSHC has the
     corporate power and authority necessary to execute, deliver, and perform
     its obligations under this Agreement and to consummate the transactions
     contemplated hereby. The execution, delivery, and performance of this
     Agreement and the consummation of the transactions contemplated herein,
     including the Merger, have been duly and validly authorized by all
     necessary corporate action in respect thereof on the part of PSHC, subject
     to the approval of this Agreement by the holders of a majority of the
     outstanding shares of PSHC Common Stock, which is the only shareholder vote
     required for approval of this Agreement and consummation of the Merger by
     PSHC. Subject to such requisite shareholder approval, this Agreement
     represents a legal, valid, and binding obligation of PSHC, enforceable
     against PSHC in accordance with its terms (except in all cases as such
     enforceability may be limited by applicable bankruptcy, insolvency,
     reorganization, receivership, conservatorship, moratorium, or similar Laws
     affecting the enforcement of creditors' rights generally and except that
     the availability of the equitable remedy of specific performance or
     injunctive relief is subject to the discretion of the court before which
     any proceeding may be brought).
 
          (b) Neither the execution and delivery of this Agreement by PSHC, nor
     the consummation by PSHC of the transactions contemplated hereby, nor
     compliance by PSHC with any of the provisions hereof, will (i) conflict
     with or result in a breach of any provision of PSHC's Articles of
     Incorporation or Bylaws or the certificate or articles of incorporation or
     bylaws of any PSHC Subsidiary or any resolution adopted by the board of
     directors or the shareholders of any PSHC Entity, or (ii) except as
     disclosed in Section 5.2 of the PSHC Disclosure Memorandum, constitute or
     result in a Default under, or require any Consent pursuant to, or result in
     the creation of any Lien on any Asset of any PSHC Entity under, any
     Contract or Permit of any PSHC Entity, where such Default or Lien, or any
     failure to obtain such Consent, is reasonably likely to have, individually
     or in the aggregate, a PSHC Material Adverse Effect or where such event
     would cause a breach hereof or a Default hereunder, or, (iii) subject to
     receipt of the requisite Consents referred to in Section 9.1(b), constitute
     or result in a Default under, or require any Consent pursuant to, any Law
     or Order applicable to any PSHC Entity or any of their respective material
     Assets (including any Seacoast Entity or any PSHC Entity becoming subject
     to or liable for the payment of any Tax or any of the Assets owned by any
     Seacoast Entity or any PSHC Entity being reassessed or revalued by any
     Taxing authority).
 
          (c) Other than in connection or compliance with the provisions of the
     Securities Laws, applicable state corporate and securities Laws, and rules
     of the NASD, and other than Consents required from Regulatory Authorities,
     and other than notices to or filings with the Internal Revenue Service or
     the Pension Benefit Guaranty Corporation with respect to any employee
     benefit plans, or under the HSR Act, and other than Consents, filings, or
     notifications which, if not obtained or made, are not reasonably likely to
     have, individually or in the aggregate, a PSHC Material Adverse Effect, no
     notice to, filing with, or
 
                                      A-11
<PAGE>   90
 
     Consent of, any public body or authority is necessary for the consummation
     by PSHC of the Merger and the other transactions contemplated in this
     Agreement.
 
          5.3 Capital Stock.  (a) The authorized capital stock of PSHC consists
     of (i) 10,000,000 shares of PSHC Common Stock, of which 744,655 shares are
     issued and outstanding as of the date of this Agreement and assuming the
     issue and exercise of all issued and outstanding warrants and options to
     purchase 201,298.625 shares of PSHC Common Stock, not more than 945,954
     shares will be issued and outstanding at the Effective Time, and (ii) no
     shares of preferred stock are authorized, issued or outstanding. All of the
     issued and outstanding shares of capital stock of PSHC are duly and validly
     issued and outstanding and are fully paid and nonassessable under the FBCA.
     None of the outstanding shares of capital stock of PSHC has been issued in
     violation of any preemptive rights of the current or past shareholders of
     PSHC.
 
          (b) Except as set forth in Section 5.3(a), or as disclosed in Section
     5.3(b) of the PSHC Disclosure Memorandum, there are no shares of capital
     stock or other equity securities of PSHC outstanding and no outstanding
     Equity Rights relating to the capital stock of PSHC.
 
          5.4 PSHC Subsidiaries.  PSHC has disclosed in Section 5.4 of the PSHC
     Disclosure Memorandum all of the PSHC Subsidiaries that are corporations
     (identifying its jurisdiction of incorporation, each jurisdiction in which
     it is qualified and/or licensed to transact business, and the number of
     shares owned and percentage ownership interest represented by such share
     ownership) and all of the PSHC Subsidiaries that are general or limited
     partnerships, limited liability companies, trusts or other non-corporate
     entities (identifying the Law under which such entity is organized, each
     jurisdiction in which it is qualified and/or licensed to transact business,
     the type of entity the type of entity and the amount and nature of the
     ownership interest therein). Except as disclosed in Section 5.4 of the PSHC
     Disclosure Memorandum, PSHC or one of its wholly-owned Subsidiaries owns
     all of the issued and outstanding shares of capital stock (or other equity
     interests) of each PSHC Subsidiary. No capital stock (or other equity
     interest) of any PSHC Subsidiary is or may become required to be issued
     (other than to another PSHC Entity) by reason of any Equity Rights, and
     there are no Contracts by which any PSHC Subsidiary is bound to issue
     (other than to another PSHC Entity) additional shares of its capital stock
     (or other equity interests) or Equity Rights or by which any PSHC Entity is
     or may be bound to transfer any shares of the capital stock (or other
     equity interests) of any PSHC Subsidiary (other than to another PSHC
     Entity). There are no Contracts relating to the rights of any PSHC Entity
     to vote or to dispose of any shares of the capital stock (or other equity
     interests) of any PSHC Subsidiary. All of the shares of capital stock (or
     other equity interests) of each PSHC Subsidiary held by a PSHC Entity are
     fully paid and (except pursuant to 12 USC Section 55 in the case of
     national banks and comparable, applicable state Law, if any, in the case of
     state depository institutions) nonassessable under the applicable
     corporation Law of the jurisdiction in which such Subsidiary is
     incorporated or organized and are owned by the PSHC Entity free and clear
     of any Lien. Except as disclosed in Section 5.4 of the PSHC Disclosure
     Memorandum, each PSHC Subsidiary is either a bank, a savings association,
     or a corporation, and each such Subsidiary is duly organized, validly
     existing, and (as to corporations) in good standing under the Laws of the
     jurisdiction in which it is incorporated or organized, and has the
     corporate power and authority necessary for it to own, lease, and operate
     its Assets and to carry on its business as now conducted. Each PSHC
     Subsidiary is duly qualified or licensed to transact business as a foreign
     corporation in good standing in the States of the United States and foreign
     jurisdictions where the character of its Assets or the nature or conduct of
     its business requires it to be so qualified or licensed, except for such
     jurisdictions in which the failure to be so qualified or licensed is not
     reasonably likely to have, individually or in the aggregate, a PSHC
     Material Adverse Effect. Each PSHC Subsidiary that is a depository
     institution is an "insured institution" as defined in the Federal Deposit
     Insurance Act and applicable regulations thereunder, and the deposits in
     which are insured by the Bank Insurance Fund. The minute books, and other
     organizational and corporate documents for each PSHC Subsidiary have been
     made available to Seacoast for its review, and, except as disclosed in
     Section 5.4 of the PSHC Disclosure Memorandum, are true and complete in all
     material respects as in effect as of the date of this
 
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<PAGE>   91
 
     Agreement and accurately reflect in all material respects all amendments
     thereto and all proceedings of the Board of Directors, all committees of
     the Board of Directors and shareholders thereof.
 
          5.5 SEC Filings; Financial Statements.  (a) PSHC has timely filed and
     made available to Seacoast, all SEC Documents required to be filed by PSHC
     since December 31, 1992 (the "PSHC SEC Reports"). The PSHC SEC Reports (i)
     at the time filed, complied in all material respects with the applicable
     requirements of the Securities Laws and other applicable Laws and (ii) did
     not, at the time they were filed (or, if amended or superseded by a filing
     prior to the date of this Agreement, then on the date of such filing)
     contain any untrue statement of a material fact or omit to state a material
     fact required to be stated in such PSHC SEC Reports or necessary in order
     to make the statements in such PSHC SEC Reports, in light of the
     circumstances under which they were made, not misleading. No PSHC
     Subsidiary is required to file any SEC Documents.
 
          (b) Each of the PSHC Financial Statements (including, in each case,
     any related notes) contained in the PSHC SEC Reports, including any PSHC
     SEC Reports filed after the date of this Agreement until the Effective
     Time, complied as to form in all material respects with the applicable
     published rules and regulations of the SEC with respect thereto, was
     prepared in accordance with GAAP applied on a consistent basis throughout
     the periods involved (except as may be indicated in the notes to such
     financial statements or, in the case of unaudited interim statements, as
     permitted by Form 10-Q of the SEC), and fairly presented in all material
     respects the consolidated financial position of PSHC and its Subsidiaries
     as at the respective dates and the consolidated results of operations and
     cash flows for the periods indicated, except that the unaudited interim
     financial statements were or are subject to normal and recurring year-end
     adjustments which were not or are not expected to be material in amount or
     effect.
 
          5.6 Absence of Undisclosed Liabilities.  No PSHC Entity has any
     Liabilities that are reasonably likely to have, individually or in the
     aggregate, a PSHC Material Adverse Effect, except Liabilities which are
     accrued or reserved against in the consolidated balance sheets of PSHC as
     of December 31, 1995 and September 30, 1996, included in the PSHC Financial
     Statements delivered prior to the date of this Agreement or reflected in
     the notes thereto. Except as set forth in Section 5.6 of the PSHC
     Disclosure Memorandum, no PSHC Entity has incurred or paid any Liability
     since September 30, 1996, except for such Liabilities incurred or paid (i)
     in the ordinary course of business consistent with past business practice
     and which are not reasonably likely to have, individually or in the
     aggregate, a PSHC Material Adverse Effect or (ii) in connection with the
     transactions contemplated by this Agreement.
 
          5.7 Absence of Certain Changes or Events.  Since December 31,1995,
     except as disclosed in the PSHC Financial Statements delivered prior to the
     date of this Agreement or as disclosed in Section 5.7 of the PSHC
     Disclosure Memorandum, (i) there have been no events, changes, or
     occurrences which have had, or are reasonably likely to have, individually
     or in the aggregate, a PSHC Material Adverse Effect, and (ii) the PSHC
     Entities have not taken any action, or failed to take any action, prior to
     the date of this Agreement, which action or failure, if taken after the
     date of this Agreement, would represent or result in a material breach or
     violation of any of the covenants and agreements of PSHC provided in
     Article 7.
 
          5.8 Tax Matters.  (a) All Tax Returns required to be filed by or on
     behalf of any of the PSHC Entities have been timely filed or requests for
     extensions have been timely filed, granted, and have not expired for
     periods ended on or before December 31, 1995, and on or before the date of
     the most recent fiscal year end immediately preceding the Effective Time,
     except to the extent that all such failures to file, taken together, are
     not reasonably likely to have a PSHC Material Adverse Effect, and all Tax
     Returns filed are complete and accurate in all material respects. All Taxes
     shown on filed Tax Returns have been paid. As of the date of this
     Agreement, there is no audit examination, deficiency, or refund Litigation
     with respect to any Taxes, except as reserved against in the PSHC Financial
     Statements delivered prior to the date of this Agreement or as disclosed in
     Section 5.8 of the PSHC Disclosure Memorandum. PSHC's federal income Tax
     Returns have not been audited by the IRS. All Taxes and other Liabilities
     due with respect to completed and settled examinations or concluded
     Litigation have been paid. There are no Liens with respect to Taxes upon
     any of the Assets of the PSHC Entities, except for any such Liens which are
     not reasonably likely to have a PSHC Material Adverse Effect.
 
                                      A-13
<PAGE>   92
 
          (b) None of the PSHC Entities has executed an extension or waiver of
     any statute of limitations on the assessment or collection of any Tax due
     (excluding such statutes that relate to years currently under examination
     by the Internal Revenue Service or other applicable taxing authorities)
     that is currently in effect.
 
          (c) The provision for any Taxes due or to become due for any of the
     PSHC Entities for the period or periods through and including the date of
     the respective PSHC Financial Statements that has been made and is
     reflected on such PSHC Financial Statements is sufficient to cover all such
     Taxes.
 
          (d) Deferred Taxes of the PSHC Entities have been provided for in
     accordance with GAAP.
 
          (e) Except as disclosed in Section 5.8(e) of the PSHC Disclosure
     Memorandum, none of the PSHC Entities is a party to any Tax allocation or
     Tax sharing agreement and none of the PSHC Entities has been a member of an
     affiliated group filing a consolidated federal income Tax Return (other
     than a group the common parent of which was PSHC) has any Liability for
     Taxes of any Person (other than PSHC and its Subsidiaries) under Treasury
     Regulation Section 1.1502-6 (or any similar provision of state, local or
     foreign Law) as a transferee or successor or by Contract or otherwise.
 
          (f) Except as disclosed in Section 5.8(f) of the PSHC Disclosure
     Memorandum, each of the PSHC Entities is in compliance with, and its
     records contain all information and documents (including properly completed
     IRS Forms W-9) necessary to comply with, all applicable information
     reporting and Tax withholding requirements under federal, state, and local
     Tax Laws, and such records identify with specificity all accounts subject
     to backup withholding under Section 3406 of the Internal Revenue Code,
     except for such instances of noncompliance and such omissions as are not
     reasonably likely to have, individually or in the aggregate, a PSHC
     Material Adverse Effect.
 
          (g) Except as disclosed in Section 5.8 of the PSHC Disclosure
     Memorandum, none of the PSHC Entities has made any payments, is obligated
     to make any payments, or is a party to any Contract that could obligate it
     to make any payments that would be disallowed as a deduction under Section
     280G or 162(m) of the Internal Revenue Code.
 
          (h) There has not been an ownership change, as defined in Internal
     Revenue Code Section 382(g), of the PSHC Entities that occurred during or
     after any Taxable Period in which the PSHC Entities incurred a net
     operating loss that carries over to any Taxable Period ending after
     December 31,1995.
 
          (i) No PSHC Entity has or has had in any foreign country a permanent
     establishment, as defined in any applicable tax treaty or convention
     between the United States and such foreign country.
 
          5.9 Allowance for Possible Loan Losses.  In the opinion of management
     of PSHC, the allowances for possible loan, credit or securities losses
     (collectively, the "Allowance") shown on the consolidated balance sheets of
     PSHC included in the most recent PSHC Financial Statements dated prior to
     the date of this Agreement was, and the Allowance shown on the consolidated
     balance sheets of PSHC included in the PSHC Financial Statements as of
     dates subsequent to the execution of this Agreement will be, as of the
     dates thereof, adequate (within the meaning of GAAP and applicable
     regulatory requirements or guidelines) to provide for all known or
     reasonably anticipated losses relating to or inherent in the loan, lease
     and securities portfolios (including accrued interest receivables) of the
     PSHC Entities and other extensions of credit (including letters of credit
     and commitments to make loans or extend credit) by the PSHC Entities as of
     the dates thereof.
 
          5.10 Assets.  (a) Except as disclosed in Section 5.10 of the PSHC
     Disclosure Memorandum or as disclosed or reserved against in the PSHC
     Financial Statements delivered prior to the date of this Agreement, the
     PSHC Entities have good and marketable title, free and clear of all Liens,
     to all of their respective Assets, except for any such Liens or other
     defects of title which are not reasonably likely to have a PSHC Material
     Adverse Effect. Except as set forth in Section 5.10 of the PSHC Disclosure
     Memorandum, all tangible properties used in the businesses of the PSHC
     Entities are in good condition, reasonable wear and tear excepted, and are
     usable in the ordinary course of business consistent with PSHC's past
     practices.
 
                                      A-14
<PAGE>   93
 
          (b) All Assets which are material to PSHC's business on a consolidated
     basis, held under leases or subleases by any of the PSHC Entities, are held
     under valid Contracts enforceable as to the PSHC Entity and to the
     Knowledge of PSHC as to the counter-party to such Contracts in accordance
     with their respective terms (except as enforceability may be limited by
     applicable bankruptcy, insolvency, reorganization, moratorium, or other
     Laws affecting the enforcement of creditors' rights generally and except
     that the availability of the equitable remedy of specific performance or
     injunctive relief is subject to the discretion of the court before which
     any proceedings may be brought), and each such Contract is in full force
     and effect.
 
          (c) The PSHC Entities currently maintain insurance similar in amounts,
     scope, and coverage to that maintained by other peer banking organizations.
     None of the PSHC Entities has received notice from any insurance carrier
     that (i) any policy of insurance will be canceled or that coverage
     thereunder will be reduced or eliminated, or (ii) premium costs with
     respect to such policies of insurance will be substantially increased.
     There are presently no claims for amounts exceeding in any individual case
     $5,000, or in the aggregate $100,000, pending under such policies of
     insurance and no notices of claims in excess of such amounts have been
     given by any PSHC Entity under such policies.
 
          (d) The Assets of the PSHC Entities include all Assets required to
     operate the business of the PSHC Entities as presently conducted.
 
          5.11 Intellectual Property.  Except as disclosed in Section 5.11 of
     the PSHC Disclosure Memorandum, each PSHC Entity owns or has a license to
     use all of the Intellectual Property used by such PSHC Entity in the course
     of its business. Each PSHC Entity is the owner of or has a license to any
     Intellectual Property sold or licensed to a third party by such PSHC Entity
     in connection with such PSHC Entity's business operations, and such PSHC
     Entity has the right to convey by sale or license any Intellectual Property
     so conveyed. No PSHC Entity is in Default under any of its Intellectual
     Property licenses. No proceedings have been instituted, or are pending or
     to the Knowledge of PSHC threatened, which challenge the rights of any PSHC
     Entity with respect to Intellectual Property used, sold or licensed by such
     PSHC Entity in the course of its business, nor has any person claimed or
     alleged any rights to such Intellectual Property. The conduct of the
     business of the PSHC Entities does not infringe any Intellectual Property
     of any other person. Except as disclosed in Section 5.11 of the PSHC
     Disclosure Memorandum, no PSHC Entity is obligated to pay any recurring
     royalties to any Person with respect to any such Intellectual Property.
     Except as disclosed in Section 5.11 of the PSHC Disclosure Memorandum,
     every officer, director, or employee of any PSHC Entity is a party to a
     Contract which requires such officer, director or employee to assign any
     interest in any Intellectual Property to a PSHC Entity and to keep
     confidential any trade secrets, proprietary data, customer information, or
     other business information of a PSHC Entity, and no such officer, director
     or employee is party to any Contract with any Person other than a PSHC
     Entity which requires such officer, director or employee to assign any
     interest in any Intellectual Property to any Person other than a PSHC
     Entity or to keep confidential any trade secrets, proprietary data,
     customer information, or other business information of any Person other
     than a PSHC Entity. Except as disclosed in Section 5.11 of the PSHC
     Disclosure Memorandum, no officer, director or to the Knowledge of PSHC any
     employee of any PSHC Entity is party to any Contract which restricts or
     prohibits such officer, director or employee from engaging in activities
     competitive with any Person, including any PSHC Entity.
 
          5.12 Environmental Matters.  (a) To the Knowledge of PSHC, each PSHC
     Entity, its Participation Facilities, and its Operating Properties are, and
     have been, in compliance with all Environmental Laws, except for violations
     which are not reasonably likely to have, individually or in the aggregate,
     a PSHC Material Adverse Effect.
 
          (b) There is no Litigation pending or, to the Knowledge of PSHC,
     threatened before any court, governmental agency, or authority or other
     forum in which any PSHC Entity or any of its Operating Properties or
     Participation Facilities (or PSHC in respect of such Operating Property or
     Participation Facility) has been or, with respect to threatened Litigation,
     may be named as a defendant (i) for alleged noncompliance (including by any
     predecessor) with any Environmental Law or (ii) relating to the
 
                                      A-15
<PAGE>   94
 
     release, discharge, spillage, or disposal into the environment of any
     Hazardous Material, whether or not occurring at, on, under, adjacent to, or
     affecting (or potentially affecting) a site owned, leased, or operated by
     any PSHC Entity or any of its Operating Properties or Participation
     Facilities, nor is there any reasonable basis for any Litigation of a type
     described in this sentence.
 
          (c) During the period of (i) any PSHC Entity's ownership or operation
     of any of their respective current properties, (ii) any PSHC Entity's
     participation in the management of any Participation Facility, or (iii) any
     PSHC Entity's holding of a security interest in a Operating Property, there
     have been no releases, discharges, spillages, or disposals of Hazardous
     Material in, on, under, adjacent to, or affecting (or potentially
     affecting) such properties; provided that with respect to the period set
     forth in (iii) above, this representation shall be made to the Knowledge of
     PSHC. Prior to the period of (i) any PSHC Entity's ownership or operation
     of any of their respective current properties, (ii) any PSHC Entity's
     participation in the management of any Participation Facility, or (iii) any
     PSHC Entity's holding of a security interest in a Operating Property, to
     the Knowledge of PSHC, there were no releases, discharges, spillages, or
     disposals of Hazardous Material in, on, under, or affecting any such
     property, Participation Facility or Operating Property.
 
          5.13 Compliance with Laws.  PSHC is duly registered as a bank holding
     company under the BHC Act. Each PSHC Entity has in effect all Permits
     necessary for it to own, lease, or operate its material Assets and to carry
     on its business as now conducted, except for those Permits the absence of
     which are not reasonably likely to have, individually or in the aggregate,
     a PSHC Material Adverse Effect, and there has occurred no Default under any
     such Permit, other than Defaults which are not reasonably likely to have,
     individually or in the aggregate, a PSHC Material Adverse Effect. Except as
     disclosed in Section 5.13 of the PSHC Disclosure Memorandum, none of the
     PSHC Entities:
 
             (a) is in Default under any of the provisions of its Articles of
        Incorporation or Bylaws (or other governing instruments);
 
             (b) is in Default under any Laws, Orders, or Permits applicable to
        its business or employees conducting its business, except for Defaults
        which are not reasonably likely to have, individually or in the
        aggregate, a PSHC Material Adverse Effect; or
 
             (c) since January 1, 1993, has received any notification or
        communication from any agency or department of federal, state, or local
        government or any Regulatory Authority or the staff thereof (i)
        asserting that any PSHC Entity is not in compliance with any of the Laws
        or Orders which such governmental authority or Regulatory Authority
        enforces, (ii) threatening to revoke any Permits, or (iii) requiring any
        PSHC Entity to enter into or consent to the issuance of a cease and
        desist order, formal agreement, directive, commitment, or memorandum of
        understanding, or to adopt any Board resolution or similar undertaking,
        which restricts materially the conduct of its business or in any manner
        relates to its capital adequacy, its credit or reserve policies, its
        management, or the payment of dividends.
 
     Copies of all material reports, correspondence, notices and other documents
     relating to any inspection, audit, monitoring or other form of review or
     enforcement action by a Regulatory Authority have been made available to
     Seacoast.
 
          5.14 Labor Relations.  No PSHC Entity is the subject of any Litigation
     asserting that it or any other PSHC Entity has committed an unfair labor
     practice (within the meaning of the National Labor Relations Act or
     comparable state law) or seeking to compel it or any other PSHC Entity to
     bargain with any labor organization as to wages or conditions of
     employment, nor is any PSHC Entity party to any collective bargaining
     agreement, nor is there any strike or other labor dispute involving any
     PSHC Entity, pending or to the Knowledge of PSHC is (i) any such strike or
     dispute threatened or (ii) there any activity involving any PSHC Entity's
     employees seeking to certify a collective bargaining unit or engaging in
     any other organization activity.
 
          5.15 Employee Benefit Plans.  (a) PSHC has disclosed in Section 5.15
     of the PSHC Disclosure Memorandum, and has delivered or made available to
     Seacoast prior to the execution of this Agreement
 
                                      A-16
<PAGE>   95
 
     copies in each case of, all pension, retirement, profit-sharing, deferred
     compensation, stock option, employee stock ownership, severance pay,
     vacation, bonus, or other incentive plan, all other written employee
     programs, arrangements, or agreements, all medical, vision, dental, or
     other health plans, all life insurance plans, and all other employee
     benefit plans or fringe benefit plans, including "employee benefit plans"
     as that term is defined in Section 3(3) of ERISA, currently adopted,
     maintained by, sponsored in whole or in part by, or contributed to by any
     PSHC Entity or ERISA Affiliate thereof for the benefit of employees,
     retirees, dependents, spouses, directors, independent contractors, or other
     beneficiaries and under which employees, retirees, dependents, spouses,
     directors, independent contractors, or other beneficiaries are eligible to
     participate (collectively, the "PSHC Benefit Plans"). Any of the PSHC
     Benefit Plans which is an "employee pension benefit plan," as that term is
     defined in Section 3(2) of ERISA, is referred to herein as a "PSHC ERISA
     Plan." Each PSHC ERISA Plan which is also a "defined benefit plan" (as
     defined in Section 414(j) of the Internal Revenue Code) is referred to
     herein as a "PSHC Pension Plan." No PSHC Pension Plan is or has been a
     multiemployer plan within the meaning of Section 3(37) of ERISA.
 
          (b) All PSHC Benefit Plans are in compliance with the applicable terms
     of ERISA, the Internal Revenue Code, and any other applicable Laws the
     breach or violation of which are reasonably likely to have, individually or
     in the aggregate, a PSHC Material Adverse Effect. Each PSHC ERISA Plan
     which is intended to be qualified under Section 401(a) of the Internal
     Revenue Code has received a favorable determination letter from the
     Internal Revenue Service, and PSHC is not aware of any circumstances likely
     to result in revocation of any such favorable determination letter. No PSHC
     Entity has engaged in a transaction with respect to any PSHC Benefit Plan
     that, assuming the taxable period of such transaction expired as of the
     date hereof, would subject any PSHC Entity to a Tax imposed by either
     Section 4975 of the Internal Revenue Code or Section 502(i) of ERISA.
 
          (c) No PSHC Pension Plan has any "unfunded current liability," as that
     term is defined in Section 302(d)(8)(A) of ERISA, and the fair market value
     of the assets of any such plan exceeds the plan's "benefit liabilities," as
     that term is defined in Section 4001(a)(16) of ERISA, when determined under
     actuarial factors that would apply if the plan terminated in accordance
     with all applicable legal requirements. Since the date of the most recent
     actuarial valuation, there has been (i) no material change in the financial
     position of any PSHC Pension Plan, (ii) no change in the actuarial
     assumptions with respect to any PSHC Pension Plan, and (iii) no increase in
     benefits under any PSHC Pension Plan as a result of plan amendments or
     changes in applicable Law which is reasonably likely to have, individually
     or in the aggregate, a PSHC Material Adverse Effect or materially adversely
     affect the funding status of any such plan. Neither any PSHC Pension Plan
     nor any "single-employer plan," within the meaning of Section 4001(a)(15)
     of ERISA, currently or formerly maintained by any PSHC Entity, or the
     single-employer plan of any entity which is considered one employer with
     PSHC under Section 4001 of ERISA or Section 414 of the Internal Revenue
     Code or Section 302 of ERISA (whether or not waived) (an "ERISA Affiliate")
     has an "accumulated funding deficiency" within the meaning of Section 412
     of the Internal Revenue Code or Section 302 of ERISA. No PSHC Entity has
     provided, or is required to provide, security to a PSHC Pension Plan or to
     any single-employer plan of an ERISA Affiliate pursuant to Section
     401(a)(29) of the Internal Revenue Code.
 
          (d) Within the six-year period preceding the Effective Time, no
     Liability under Subtitle C or D of Title IV of ERISA has been or is
     expected to be incurred by any PSHC Entity with respect to any ongoing,
     frozen, or terminated single-employer plan or the single-employer plan of
     any ERISA Affiliate. No PSHC Entity has incurred any withdrawal Liability
     with respect to a multiemployer plan under Subtitle B of Title IV of ERISA
     (regardless of whether based on contributions of an ERISA Affiliate. No
     notice of a "reportable event," within the meaning of Section 4043 of ERISA
     for which the 30-day reporting requirement has not been waived, has been
     required to be filed for any PSHC Pension Plan or by any ERISA Affiliate
     within the 12-month period ending on the date hereof.
 
          (e) Except as disclosed in Section 5.15 of the PSHC Disclosure
     Memorandum, no PSHC Entity has any Liability for retiree health and life
     benefits under any of the PSHC Benefit Plans and there are no
 
                                      A-17
<PAGE>   96
 
     restrictions on the rights of such PSHC Entity to amend or terminate any
     such retiree health or benefit Plan without incurring any Liability
     thereunder.
 
          (f) Except as disclosed in Section 5.15 of the PSHC Disclosure
     Memorandum, neither the execution and delivery of this Agreement nor the
     consummation of the transactions contemplated hereby will (i) result in any
     payment (including severance, unemployment compensation, golden parachute,
     or otherwise) becoming due to any director or any employee of any PSHC
     Entity from any PSHC Entity under any PSHC Benefit Plan or otherwise, (ii)
     increase any benefits otherwise payable under any PSHC Benefit Plan, or
     (iii) result in any acceleration of the time of payment or vesting of any
     such benefit.
 
          (g) The actuarial present values of all accrued deferred compensation
     entitlements (including entitlements under any executive compensation,
     supplemental retirement, or employment agreement) of employees and former
     employees of any PSHC Entity and their respective beneficiaries, other than
     entitlements accrued pursuant to funded retirement plans subject to the
     provisions of Section 412 of the Internal Revenue Code or Section 302 of
     ERISA, have been fully reflected on the PSHC Financial Statements to the
     extent required by and in accordance with GAAP.
 
          (h) PSHC (including its subsidiaries and successors) may satisfy its
     current and future liabilities under the Port St. Lucie National Bank
     Deferred Compensation Plan (the "Deferred Plan") by making, as soon as
     administratively feasible after the date on which it terminates the
     Deferred Plan, single lump sum payments (which in the aggregate are equal
     to or less than the fair market value of the life insurance policy or
     policies purchased to fund the benefits under the Deferred Plan) to each
     participant or his beneficiary, which payments are equal to each such
     participant's respective accrued benefit under the Deferred Plan as of the
     date on which the Deferred Plan is terminated. In the case of a life
     insurance policy held in the trust, "fair market value" shall mean the net
     cash surrender value of the policy, after deducting any cancellation,
     liquidation or surrender charges or fees. There are no restrictions on
     PSHC's (including its subsidiaries and successors) ability to obtain such
     cash surrender value as of or immediately following the Closing Date (other
     than applicable surrender charges). Neither Seacoast nor any PSHC Entity
     shall be obligated to contribute cash or other property to fund such
     benefits under the Deferred Plan. There are no restrictions on the PSHC's
     (including its subsidiaries and successors) right to terminate the Deferred
     Plan as to benefits which have not accrued as of the Closing Date.
 
          5.16 Material Contracts.  Except as disclosed in Section 5.16 of the
     PSHC Disclosure Memorandum or otherwise reflected in the PSHC Financial
     Statements, none of the PSHC Entities, nor any of their respective Assets,
     businesses, or operations, is a party to, or is bound or affected by, or
     receives benefits under, (i) any employment, severance, termination,
     consulting, or retirement Contract providing for aggregate payments to any
     Person in any calendar year in excess of $50,000, (ii) any Contract
     relating to the borrowing of money by any PSHC Entity or the guarantee by
     any PSHC Entity of any such obligation (other than Contracts evidencing
     deposit liabilities, purchases of federal funds, fully-secured repurchase
     agreements, and Federal Home Loan Bank advances of depository institution
     Subsidiaries, trade payables and Contracts relating to borrowings or
     guarantees made in the ordinary course of business), (iii) any Contract
     which prohibits or restricts any PSHC Entity from engaging in any business
     activities in any geographic area, line of business or otherwise in
     competition with any other Person, (iv) any Contract between or among PSHC
     Entities, (v) any Contract involving Intellectual Property (other than
     Contracts entered into in the ordinary course with customers and commercial
     "shrink-wrap" software licenses), (vi) any Contract relating to the
     provision of data processing, network communication, or other technical
     services to or by any PSHC Entity, (vii) any Contract relating to the
     purchase or sale of any goods or services (other than Contracts entered
     into in the ordinary course of business and involving payments under any
     individual Contract not in excess of $100,000), (viii) any exchange-traded
     or over-the-counter swap, forward, future, option, cap, floor, or collar
     financial Contract, or any other interest rate or foreign currency
     protection Contract not included on its balance sheet which is a financial
     derivative Contract, and (ix) any other Contract or amendment thereto that
     would be required to be filed as an exhibit to a Form 10-K filed by PSHC
     with the SEC as of the date of this Agreement (together with all Contracts
     referred to in Sections 5.10 and 5.15(a), the "PSHC Contracts"). With
     respect to each PSHC Contract and except as disclosed in Section 5.16 of
     the PSHC Disclosure Memoran-
 
                                      A-18
<PAGE>   97
 
     dum: (i) the Contract is in full force and effect; (ii) no PSHC Entity is
     in Default thereunder or would be in Default thereunder as a result of this
     Agreement or the transaction contemplated herein; (iii) no PSHC Entity has
     repudiated or waived any material provision of any such Contract; and (iv)
     no other party to any such Contract is, to the Knowledge of PSHC, in
     Default in any respect or has repudiated or waived any material provision
     thereunder. All of the indebtedness of any PSHC Entity for money borrowed
     is prepayable at any time by such PSHC Entity without penalty or premium.
     None of PSHC nor any of the PSHC Entities has any obligation or liability
     to any wholesale mortgage business ("Wholesale Mortgage Business") or to
     any Affiliate of such Persons to purchase, fund or extend credit with
     respect to any loans, extensions of credit, mortgages, or any participation
     or other interest therein originated, brokered or referred by or through
     such Persons, and the only outstanding balances under any such arrangements
     whereby PSNB is obligated to provide funding aggregate not more than
     $212,000, all of which will be repaid in full by not later than April 30,
     1997. Except as described in Section 5.16 of the PSHC Disclosure
     Memorandum, all Contracts to which PSHC and/or its Subsidiaries are parties
     may be terminated by such PSHC Entity and its successors and assigns
     without penalty, charge, liability or further obligation.
 
          5.17 Legal Proceedings.  There is no Litigation instituted or pending,
     or, to the Knowledge of PSHC, threatened (or unasserted but considered
     probable of assertion and which if asserted would have at least a
     reasonable probability of an unfavorable outcome) against any PSHC Entity
     or any employee benefit plan of any PSHC Entity, or against any director or
     employee of any PSHC Entity, in their capacity as such, or against any
     Asset, interest, or right of any of them, nor are there any Orders of any
     Regulatory Authorities, other governmental authorities, or arbitrators
     outstanding against any PSHC Entity. Section 5.17 of the PSHC Disclosure
     Memorandum contains a summary of all Litigation as of the date of this
     Agreement to which any PSHC Entity is a party and which names a PSHC Entity
     as a defendant or cross-defendant or for which any PSHC Entity has any
     potential Liability.
 
          5.18 Reports.  Except as set forth in Section 5.18 of the PSHC
     Disclosure Memorandum, since January 1, 1993, or the date of organization
     if later, each PSHC Entity has timely filed all reports and statements,
     together with any amendments required to be made with respect thereto, that
     it was required to file with Regulatory Authorities (except, in the case of
     state securities authorities, failures to file which are not reasonably
     likely to have, individually or in the aggregate, a PSHC Material Adverse
     Effect). As of their respective dates, each of such reports and documents,
     including the financial statements, exhibits, and schedules thereto,
     complied in all material respects with all applicable Laws. As of its
     respective date, each such report and document did not, in all material
     respects, contain any untrue statement of a material fact or omit to state
     a material fact required to be stated therein or necessary to make the
     statements made therein, in light of the circumstances under which they
     were made, not misleading.
 
          5.19 Statements True and Correct.  No statement, certificate,
     instrument, or other writing furnished or to be furnished by any PSHC
     Entity or any Affiliate thereof to Seacoast pursuant to this Agreement or
     any other document, agreement, or instrument referred to herein contains or
     will contain any untrue statement of material fact or will omit to state a
     material fact necessary to make the statements therein, in light of the
     circumstances under which they were made, not misleading. None of the
     information supplied or to be supplied by any PSHC Entity or any Affiliate
     thereof for inclusion in the Registration Statement to be filed by Seacoast
     with the SEC will, when the Registration Statement becomes effective, be
     false or misleading with respect to any material fact, or omit to state any
     material fact necessary to make the statements therein not misleading. None
     of the information supplied or to be supplied by any PSHC Entity or any
     Affiliate thereof for inclusion in the Joint Proxy Statement to be mailed
     to each Party's shareholders in connection with the Shareholders' Meetings,
     and any other documents to be filed by a PSHC Entity or any Affiliate
     thereof with the SEC or any other Regulatory Authority in connection with
     the transactions contemplated hereby, will, at the respective time such
     documents are filed, and with respect to the Joint Proxy Statement, when
     first mailed to the shareholders of PSHC and Seacoast, be false or
     misleading with respect to any material fact, or omit to state any material
     fact necessary to make the statements therein, in light of the
     circumstances under which they were made, not misleading, or, in the case
     of the Joint Proxy Statement or any amendment thereof or
 
                                      A-19
<PAGE>   98
 
     supplement thereto, at the time of the Shareholders' Meetings, be false or
     misleading with respect to any material fact, or omit to state any material
     fact necessary to correct any statement in any earlier communication with
     respect to the solicitation of any proxy for the Shareholders' Meetings.
     All documents that any PSHC Entity or any Affiliate thereof is responsible
     for filing with any Regulatory Authority in connection with the
     transactions contemplated hereby will comply as to form in all material
     respects with the provisions of applicable Law.
 
          5.20 Accounting, Tax and Regulatory Matters.  No PSHC Entity or any
     Affiliate thereof has taken or agreed to take any action or has any
     Knowledge of any fact or circumstance that is reasonably likely to (i)
     prevent the Merger from qualifying for pooling-of-interests accounting
     treatment or as a reorganization within the meaning of Section 368(a) of
     the Internal Revenue Code, or (ii) materially impede or delay receipt of
     any Consents of Regulatory Authorities referred to in Section 9.1(b) or
     result in the imposition of a condition or restriction of the type referred
     to in the last sentence of such Section.
 
          5.21 State Takeover Laws.  Each PSHC Entity has taken all necessary
     action to exempt the transactions contemplated by this Agreement from, or
     if necessary to challenge the validity or applicability of, any applicable
     "moratorium," "fair price," "business combination," "control share," or
     other anti-takeover Laws (collectively, "Takeover Laws").
 
          5.22 Charter Provisions.  Each PSHC Entity has taken all action so
     that the entering into of this Agreement and the consummation of the Merger
     and the other transactions contemplated by this Agreement do not and will
     not result in the grant of any rights to any Person under the Articles of
     Incorporation, Bylaws or other governing instruments of any PSHC Entity or
     restrict or impair the ability of Seacoast or any of its Subsidiaries to
     vote, or otherwise to exercise the rights of a shareholder with respect to,
     shares of any PSHC Entity that may be directly or indirectly acquired or
     controlled by them. This Agreement and the transactions contemplated herein
     will not trigger any supermajority voting provisions under the Articles of
     Incorporation, Bylaws, or other governing instruments of any PSHC Entity.
 
          5.23 Opinion of Financial Advisor.  PSHC has received the opinion of
     Austin Associates, Inc., dated the date of this Agreement, to the effect
     that the consideration to be received in the Merger by the holders of PSHC
     Common Stock is fair, from a financial point of view, to such holders, a
     signed copy of which has been delivered to Seacoast.
 
          5.24 Board Recommendation.  The Board of Directors of PSHC, at a
     meeting duly called and held, has by unanimous vote of the directors
     present (who constituted all of the directors then in office) (i)
     determined that this Agreement and the transactions contemplated hereby,
     including the Merger, taken together, are fair to and in the best interests
     of the shareholders and (ii) resolved to recommend that the holders of the
     shares of PSHC Common Stock approve this Agreement.
 
                                   ARTICLE 6
 
                   REPRESENTATIONS AND WARRANTIES OF SEACOAST
 
     Seacoast hereby represents and warrants to PSHC as follows:
 
          6.1 Organization, Standing, and Power.  Seacoast is a corporation duly
     organized, validly existing, and in good standing under the Laws of the
     State of Florida, and has the corporate power and authority to carry on its
     business as now conducted and to own, lease and operate its material
     Assets. Seacoast is duly qualified or licensed to transact business as a
     foreign corporation in good standing in the States of the United States and
     foreign jurisdictions where the character of its Assets or the nature or
     conduct of its business requires it to be so qualified or licensed, except
     for such jurisdictions in which the failure to be so qualified or licensed
     is not reasonably likely to have, individually or in the aggregate, a
     Seacoast Material Adverse Effect.
 
          6.2 Authority of Seacoast; No Breach By Agreement.  (a) Seacoast has
     the corporate power and authority necessary to execute, deliver and perform
     its obligations under this Agreement and to
 
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<PAGE>   99
 
     consummate the transactions contemplated hereby. The execution, delivery
     and performance of this Agreement and the consummation of the transactions
     contemplated herein, including the Merger, have been duly and validly
     authorized by all necessary corporate action in respect thereof on the part
     of Seacoast, subject to the approval of the issuance of the shares of
     Seacoast Common Stock pursuant to the Merger by sixty-six and two-thirds
     percent (66 2/3%) of all and each class of the votes cast at the Seacoast
     Shareholders' Meeting (assuming for such purpose that the votes cast in
     respect of such proposal represent sixty-six and two-thirds percent
     (66 2/3%) of all and each class of the outstanding Seacoast Common Stock
     eligible to vote at the Seacoast Shareholders' Meeting), which is the only
     shareholder vote required for approval of this Agreement and consummation
     of the merger by Seacoast. Subject to such requisite shareholder approval,
     this Agreement represents a legal, valid, and binding obligation of
     Seacoast, enforceable against Seacoast in accordance with its terms (except
     in all cases as such enforceability may be limited by applicable
     bankruptcy, insolvency, reorganization, receivership, conservatorship,
     moratorium, or similar Laws affecting the enforcement of creditors' rights
     generally and except that the availability of the equitable remedy of
     specific performance or injunctive relief is subject to the discretion of
     the court before which any proceeding may be brought).
 
          (b) Neither the execution and delivery of this Agreement by Seacoast,
     nor the consummation by Seacoast of the transactions contemplated hereby,
     nor compliance by Seacoast with any of the provisions hereof, will (i)
     conflict with or result in a breach of any provision of Seacoast's Articles
     of Incorporation or Bylaws, or (ii) constitute or result in a Default
     under, or require any Consent pursuant to, or result in the creation of any
     Lien on any Asset of any Seacoast Entity under, any Contract or Permit of
     any Seacoast Entity, where such Default or Lien, or any failure to obtain
     such Consent, is reasonably likely to have, individually or in the
     aggregate, a Seacoast Material Adverse Effect, or, (iii) subject to receipt
     of the requisite Consents referred to in Section 9.1(b), constitute or
     result in a Default under, or require any Consent pursuant to, any Law or
     Order applicable to any Seacoast Entity or any of their respective material
     Assets (including any Seacoast Entity or any PSHC Entity becoming subject
     to or liable for the payment of any Tax or any of the Assets owned by any
     Seacoast Entity or any PSHC Entity being reassessed or revalued by any
     Taxing authority).
 
          (c) Other than in connection or compliance with the provisions of the
     Securities Laws, applicable state corporate and securities Laws, and rules
     of the NASD, and other than Consents required from Regulatory Authorities,
     and other than notices to or filings with the Internal Revenue Service or
     the Pension Benefit Guaranty Corporation with respect to any employee
     benefit plans, or under the HSR Act, and other than Consents, filings, or
     notifications which, if not obtained or made, are not reasonably likely to
     have, individually or in the aggregate, a Seacoast Material Adverse Effect,
     no notice to, filing with, or Consent of, any public body or authority is
     necessary for the consummation by Seacoast of the Merger and the other
     transactions contemplated in this Agreement.
 
          6.3 Capital Stock.  (a) The authorized capital stock of Seacoast
     consists of (i) 10,000,000 shares of Seacoast Class A Common Stock, of
     which 3,903,392 shares are issued and 3,872,500 outstanding as of the date
     of this Agreement, (ii) 810,000 shares of $.10 par value Class B Common
     Stock, of which 384,638 shares are issued and outstanding as of the date of
     this Agreement, and (iii) 1,000,000 shares of Seacoast Preferred Stock,
     none of which are issued and outstanding. All of the issued and outstanding
     shares of Seacoast Capital Stock are, and all of the shares of Seacoast
     Common Stock to be issued in exchange for shares of PSHC Common Stock upon
     consummation of the Merger, when issued in accordance with the terms of
     this Agreement, will be, duly and validly issued and outstanding and fully
     paid and nonassessable. None of the outstanding shares of Seacoast Capital
     Stock has been, and none of the shares of Seacoast Common Stock to be
     issued in exchange for shares of PSHC Common Stock upon consummation of the
     Merger will be, issued in violation of any preemptive rights of the current
     or past shareholders of Seacoast.
 
          (b) Except as set forth in Section 6.3(a), or as disclosed in Section
     6.3 of the Seacoast Disclosure Memorandum, there are no shares of capital
     stock or other equity securities of Seacoast outstanding and no outstanding
     Equity Rights relating to the capital stock of Seacoast.
 
                                      A-21
<PAGE>   100
 
          6.4 Seacoast Subsidiaries.  Seacoast has disclosed in Section 6.4 of
     the Seacoast Disclosure Memorandum all of the Seacoast Subsidiaries as of
     the date of this Agreement that are corporations (identifying its
     jurisdiction of incorporation, each jurisdiction in which the character of
     its Assets or the nature or conduct of its business requires it to be
     qualified and/or licensed to transact business, and the number of shares
     owned and percentage ownership interest represented by such share
     ownership) and all of the Seacoast Subsidiaries that are general or limited
     partnerships or other non-corporate entities (identifying the Law under
     which such entity is organized, each jurisdiction in which the character of
     its Assets or the nature or conduct of its business requires it to be
     qualified and/or licensed to transact business, and the amount and nature
     of the ownership interest therein). Except as disclosed in Section 6.4 of
     the Seacoast Disclosure Memorandum, Seacoast or one of its wholly-owned
     Subsidiaries owns all of the issued and outstanding shares of capital stock
     (or other equity interests) of each Seacoast Subsidiary. No capital stock
     (or other equity interest) of any Seacoast Subsidiary are or may become
     required to be issued (other than to another Seacoast Entity) by reason of
     any Equity Rights, and there are no Contracts by which any Seacoast
     Subsidiary is bound to issue (other than to another Seacoast Entity)
     additional shares of its capital stock (or other equity interests) or
     Equity Rights or by which any Seacoast Entity is or may be bound to
     transfer any shares of the capital stock (or other equity interests) of any
     Seacoast Subsidiary (other than to another Seacoast Entity). There are no
     Contracts relating to the rights of any Seacoast Entity to vote or to
     dispose of any shares of the capital stock (or other equity interests) of
     any Seacoast Subsidiary. All of the shares of capital stock (or other
     equity interests) of each Seacoast Subsidiary held by a Seacoast Entity are
     fully paid and (except pursuant to 12 USC Section 55 in the case of
     national banks and comparable, applicable state Law, if any, in the case of
     state depository institutions) nonassessable and are owned by the Seacoast
     Entity free and clear of any Lien. Each Seacoast Subsidiary is either a
     bank, a savings association, or a corporation, and is duly organized,
     validly existing, and (as to corporations) in good standing under the Laws
     of the jurisdiction in which it is incorporated or organized, and has the
     corporate power and authority necessary for it to own, lease and operate
     its Assets and to carry on its business as now conducted. Each Seacoast
     Subsidiary is duly qualified or licensed to transact business as a foreign
     corporation in good standing in the States of the United States and foreign
     jurisdictions where the character of its Assets or the nature or conduct of
     its business requires it to be so qualified or licensed, except for such
     jurisdictions in which the failure to be so qualified or licensed is not
     reasonably likely to have, individually or in the aggregate, a Seacoast
     Material Adverse Effect. Each Seacoast Subsidiary that is a depository
     institution is an "insured institution" as defined in the Federal Deposit
     Insurance Act and applicable regulations thereunder, and the deposits in
     which are insured by the Bank Insurance Fund or the Savings Association
     Insurance Fund.
 
          6.5 SEC Filings; Financial Statements.  (a) Seacoast has timely filed
     and made available to PSHC all SEC Documents required to be filed by
     Seacoast since December 31, 1992 (the "Seacoast SEC Reports"). The Seacoast
     SEC Reports (i) at the time filed, complied in all material respects with
     the applicable requirements of the Securities Laws and other applicable
     Laws and (ii) did not, at the time they were filed (or, if amended or
     superseded by a filing prior to the date of this Agreement, then on the
     date of such filing) contain any untrue statement of a material fact or
     omit to state a material fact required to be stated in such Seacoast SEC
     Reports or necessary in order to make the statements in such Seacoast SEC
     Reports, in light of the circumstances under which they were made, not
     misleading. Except for Seacoast Subsidiaries that are registered as a
     broker, dealer, or investment advisor, no Seacoast Subsidiary is required
     to file any SEC Documents.
 
          (b) Each of the Seacoast Financial Statements (including, in each
     case, any related notes) contained in the Seacoast SEC Reports, including
     any Seacoast SEC Reports filed after the date of this Agreement until the
     Effective Time, complied as to form in all material respects with the
     applicable published rules and regulations of the SEC with respect thereto,
     was prepared in accordance with GAAP applied on a consistent basis
     throughout the periods involved (except as may be indicated in the notes to
     such financial statements or, in the case of unaudited interim statements,
     as permitted by Form 10-Q of the SEC), and fairly presented in all material
     respects the consolidated financial position of Seacoast and its
     Subsidiaries as at the respective dates and the consolidated results of
     operations and cash flows for the periods indicated, except that the
     unaudited interim financial statements were or are subject to normal
 
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<PAGE>   101
 
     and recurring year-end adjustments which were not or are not expected to be
     material in amount or effect.
 
          6.6 Absence of Undisclosed Liabilities.  No Seacoast Entity has any
     Liabilities that are reasonably likely to have, individually or in the
     aggregate, a Seacoast Material Adverse Effect, except Liabilities which are
     accrued or reserved against in the consolidated balance sheets of Seacoast
     as of December 31, 1995 and September 30, 1996, included in the Seacoast
     Financial Statements delivered prior to the date of this Agreement or
     reflected in the notes thereto. No Seacoast Entity has incurred or paid any
     Liability since September 30, 1996, except for such Liabilities incurred or
     paid (i) in the ordinary course of business consistent with past business
     practice and which are not reasonably likely to have, individually or in
     the aggregate, a Seacoast Material Adverse Effect or (ii) in connection
     with the transactions contemplated by this Agreement.
 
          6.7 Absence of Certain Changes or Events.  Since December 31, 1995,
     except as disclosed in the Seacoast Financial Statements delivered prior to
     the date of this Agreement or as disclosed in Section 6.7 of the Seacoast
     Disclosure Memorandum, (i) there have been no events, changes or
     occurrences which have had, or are reasonably likely to have, individually
     or in the aggregate, a Seacoast Material Adverse Effect, and (ii) the
     Seacoast Entities have not taken any action, or failed to take any action,
     prior to the date of this Agreement, which action or failure, if taken
     after the date of this Agreement, would represent or result in a material
     breach or violation of any of the covenants and agreements of Seacoast
     provided in Article 7.
 
          6.8 Certain Environmental and Employee Benefit Matters.  (a) To the
     Knowledge of Seacoast, each Seacoast Entity, its Participation Facilities
     and its Operating Properties, are, and have been, in compliance with all
     environmental law, except for violations which are not reasonably likely to
     have, individually or in the aggregate, a Seacoast Material Adverse Effect.
 
          (b) Seacoast has delivered or made available to PSHC prior to the
     execution hereof, copies or summary plan descriptions of all pension,
     retirement, profit/life insurance, deferred compensation, common stock
     option, employee stock ownership, severance pay, vacation, bonus, or other
     incentive plan, all other written employee programs, arrangements or
     agreements, all medical, vision, dental and other health plans, all life
     insurance plans, and all other employee benefit plans or fringe benefit
     plans, including "employee benefit plans" as that term is defined in
     Section 3(3) of ERISA, currently adopted and maintained by, sponsored in
     whole or in part by, or contributed to by any Seacoast Entity or ERISA
     Affiliate thereof for the benefit of employees, retirees, dependents,
     spouses, directors, independent contractors or other beneficiaries and
     under which such employees, retirees, dependents, spouses, directors,
     independent contractors, or other beneficiaries are eligible to participate
     (collectively, the "Seacoast Benefit Plans"). All Seacoast Benefit Plans
     are in compliance with the applicable terms of ERISA, the Internal Revenue
     Code or any other applicable Laws, except for such breaches or violations
     the which are not reasonably likely to have individually or in the
     aggregate, a Seacoast Material Adverse Effect.
 
          6.9 Allowance for Possible Loan Losses.  In the opinion of management
     of Seacoast, the Allowance shown on the consolidated balance sheets of
     Seacoast included in the most recent Seacoast Financial Statements dated
     prior to the date of this Agreement was, and the Allowance shown on the
     consolidated balance sheets of Seacoast included in the Seacoast Financial
     Statements as of dates subsequent to the execution of this Agreement will
     be, as of the dates thereof, adequate (within the meaning of GAAP and
     applicable regulatory requirements or guidelines) to provide for all known
     or reasonably anticipated losses relating to or inherent in the loan, lease
     and securities portfolios (including accrued interest receivables) of the
     Seacoast Entities and other extensions of credit (including letters of
     credit and commitments to make loans or extend credit) by the Seacoast
     Entities as of the dates thereof.
 
          6.10 Assets.  (a) Except as disclosed in Section 6.10 of the Seacoast
     Disclosure Memorandum or as disclosed or reserved against in the Seacoast
     Financial Statements delivered prior to the date of this Agreement, the
     Seacoast Entities have good and marketable title, free and clear of all
     Liens, to all of their respective Assets, except for any such Liens or
     other defects of title which are not reasonably likely
 
                                      A-23
<PAGE>   102
 
     to have a Seacoast Material Adverse Effect. All tangible properties used in
     the businesses of the Seacoast Entities are in good condition, reasonable
     wear and tear excepted, and are usable in the ordinary course of business
     consistent with Seacoast's past practices.
 
          (b) All Assets which are material to Seacoast's business on a
     consolidated basis, held under leases or subleases by any of the Seacoast
     Entities, are held under valid Contracts enforceable in accordance with
     their respective terms (except as enforceability may be limited by
     applicable bankruptcy, insolvency, reorganization, moratorium, or other
     Laws affecting the enforcement of creditors' rights generally and except
     that the availability of the equitable remedy of specific performance or
     injunctive relief is subject to the discretion of the court before which
     any proceedings may be brought), and each such Contract is in full force
     and effect.
 
          (c) The Seacoast Entities currently maintain insurance similar in
     amounts, scope and coverage to that maintained by other peer banking
     organizations. None of the Seacoast Entities has received notice from any
     insurance carrier that (i) such insurance will be canceled or that coverage
     thereunder will be reduced or eliminated, or (ii) premium costs with
     respect to such policies of insurance will be substantially increased.
     There are presently no claims for amounts exceeding in any individual cases
     $5,000 or in the aggregate $100,000 pending under such policies of
     insurance and no notices have been given by any Seacoast Entity under such
     policies.
 
          (d) The Assets of the Seacoast Entities include all assets required to
     operate the business of the Seacoast Entities as presently conducted.
 
          6.11 Intellectual Property.  Each Seacoast Entity owns or has a
     license to use all of the Intellectual Property used by such Seacoast
     Entity in the course of its business. Each Seacoast Entity is the owner of
     or has a license to any Intellectual Property sold or licensed to a third
     party by such Seacoast Entity in connection with such Seacoast Entity's
     business operations, and such Seacoast Entity has the right to convey by
     sale or license any Intellectual Property so conveyed. No Seacoast Entity
     is in Default under any of its Intellectual Property licenses. No
     proceedings have been instituted, or are pending or to the Knowledge of
     Seacoast threatened, which challenge the rights of any Seacoast Entity with
     respect to Intellectual Property used, sold or licensed by such Seacoast
     Entity in the course of its business, nor has any person claimed or alleged
     any rights to such Intellectual Property. The conduct of the business of
     the Seacoast Entities does not infringe any Intellectual Property of any
     other person. Except as disclosed in Section 6.11 of the Seacoast
     Disclosure Memorandum, no Seacoast Entity is obligated to pay any recurring
     royalties to any Person with respect to any such Intellectual Property.
     Except as disclosed in Section 6.11 of the Seacoast Disclosure Memorandum,
     every officer, director, or employee of any Seacoast Entity is a party to a
     Contract which requires such officer, director or employee to assign any
     interest in any Intellectual Property to a Seacoast Entity and to keep
     confidential any trade secrets, proprietary data, customer information, or
     other business information of a Seacoast Entity, and no such officer,
     director or employee is party to any Contract with any Person other than a
     Seacoast Entity which requires such officer, director or employee to assign
     any interest in any Intellectual Property to any Person other than a
     Seacoast Entity or to keep confidential any trade secrets, proprietary
     data, customer information, or other business information of any Person
     other than a Seacoast Entity. Except as disclosed in Section 6.11 of the
     Seacoast Disclosure Memorandum, no officer, director or employee of any
     Seacoast Entity is party to any Contract which restricts or prohibits such
     officer, director or employee from engaging in activities competitive with
     any Person, including any Seacoast Entity.
 
          6.12 [Reserved].
 
          6.13 Compliance with Laws.  Seacoast is duly registered as a bank
     holding company under the BHC Act. Each Seacoast Entity has in effect all
     Permits necessary for it to own, lease or operate its material Assets and
     to carry on its business as now conducted, except for those Permits the
     absence of which are not reasonably likely to have, individually or in the
     aggregate, a Seacoast Material Adverse Effect, and there has occurred no
     Default under any such Permit, other than Defaults which are not
 
                                      A-24
<PAGE>   103
 
     reasonably likely to have, individually or in the aggregate, a Seacoast
     Material Adverse Effect. Except as disclosed in Section 6.13 of the
     Seacoast Disclosure Memorandum, none of the Seacoast Entities:
 
             (a) is in Default under its Articles of Incorporation or Bylaws (or
        other governing instruments); or
 
             (b) is in Default under any Laws, Orders or Permits applicable to
        its business or employees conducting its business, except for Defaults
        which are not reasonably likely to have, individually or in the
        aggregate, a Seacoast Material Adverse Effect; or
 
             (c) since January 1, 1993, has received any notification or
        communication from any agency or department of federal, state, or local
        government or any Regulatory Authority or the staff thereof (i)
        asserting that any Seacoast Entity is not in compliance with any of the
        Laws or Orders which such governmental authority or Regulatory Authority
        enforces, (ii) threatening to revoke any Permits or (iii) requiring any
        Seacoast Entity to enter into or consent to the issuance of a cease and
        desist order, formal agreement, directive, commitment or memorandum of
        understanding, or to adopt any Board resolution or similar undertaking,
        which restricts materially the conduct of its business, or in any manner
        relates to its capital adequacy, its credit or reserve policies, its
        management, or the payment of dividends.
 
          6.14 Legal Proceedings.  There is no Litigation instituted or pending,
     or, to the Knowledge of Seacoast, threatened (or unasserted but considered
     probable of assertion and which if asserted would have at least a
     reasonable probability of an unfavorable outcome) against any Seacoast
     Entity or employee benefit plan of any Seacoast Entity, or against any
     director or employee of any Seacoast Entity, in their capacity as such, or
     against any Asset, interest, or right of any of them, that is reasonably
     likely to have, individually or in the aggregate, a Seacoast Material
     Adverse Effect, nor are there any Orders of any Regulatory Authorities,
     other governmental authorities, or arbitrators outstanding against any
     Seacoast Entity.
 
          6.15 Reports.  Since January 1, 1993, or the date of organization if
     later, each Seacoast Entity has filed all reports and statements, together
     with any amendments required to be made with respect thereto, that it was
     required to file with Regulatory Authorities (except, in the case of state
     securities authorities, failures to file which are not reasonably likely to
     have, individually or in the aggregate, a Seacoast Material Adverse
     Effect). As of their respective dates, each of such reports and documents,
     including the financial statements, exhibits, and schedules thereto,
     complied in all material respects with all applicable Laws. As of its
     respective date, each such report and document did not, in all material
     respects, contain any untrue statement of a material fact or omit to state
     a material fact required to be stated therein or necessary to make the
     statements made therein, in light of the circumstances under which they
     were made, not misleading.
 
          6.16 Statements True and Correct.  No statement, certificate,
     instrument or other writing furnished or to be furnished by any Seacoast
     Entity or any Affiliate thereof to PSHC pursuant to this Agreement or any
     other document, agreement or instrument referred to herein contains or will
     contain any untrue statement of material fact or will omit to state a
     material fact necessary to make the statements therein, in light of the
     circumstances under which they were made, not misleading. None of the
     information supplied or to be supplied by any Seacoast Entity or any
     Affiliate thereof for inclusion in the Registration Statement to be filed
     by Seacoast with the SEC, will, when the Registration Statement becomes
     effective, be false or misleading with respect to any material fact, or
     omit to state any material fact necessary to make the statements therein
     not misleading. None of the information supplied or to be supplied by any
     Seacoast Entity or any Affiliate thereof for inclusion in the Joint Proxy
     Statement to be mailed to each Party's shareholders in connection with the
     Shareholders' Meetings, and any other documents to be filed by any Seacoast
     Entity or any Affiliate thereof with the SEC or any other Regulatory
     Authority in connection with the transactions contemplated hereby, will, at
     the respective time such documents are filed, and with respect to the Joint
     Proxy Statement, when first mailed to the shareholders of PSHC and
     Seacoast, be false or misleading with respect to any material fact, or omit
     to state any material fact necessary to make the statements therein, in
     light of the circumstances under
 
                                      A-25
<PAGE>   104
 
     which they were made, not misleading, or, in the case of the Joint Proxy
     Statement or any amendment thereof or supplement thereto, at the time of
     the Shareholders' Meetings, be false or misleading with respect to any
     material fact, or omit to state any material fact necessary to correct any
     statement in any earlier communication with respect to the solicitation of
     any proxy for the Shareholders' Meetings. All documents that any Seacoast
     Entity or any Affiliate thereof is responsible for filing with any
     Regulatory Authority in connection with the transactions contemplated
     hereby will comply as to form in all material respects with the provisions
     of applicable Law.
 
          6.17 Accounting, Tax and Regulatory Matters.  No Seacoast Entity or
     any Affiliate thereof has taken or agreed to take any action or has any
     Knowledge of any fact or circumstance that is reasonably likely to (i)
     prevent the Merger from qualifying for pooling-of-interests accounting
     treatment or as a reorganization within the meaning of Section 368(a) of
     the Internal Revenue Code, or (ii) materially impede or delay receipt of
     any Consents of Regulatory Authorities referred to in Section 9.1(b) or
     result in the imposition of a condition or restriction of the type referred
     to in the last sentence of such Section. All Tax Returns required to be
     filed by or on behalf of any of the Seacoast Entities have been timely
     filed or requests for extensions have been timely filed, granted and have
     not expired for periods on or before December 31, 1995 and on or before the
     day of the most recent fiscal year end immediately preceding the Effective
     Time, except to the extent that all such failures to file, taken together,
     are not reasonably likely to have a Seacoast Material Adverse Effect and
     all such Tax Returns filed are complete and accurate in all material
     respects. All Taxes shown on Tax Returns have been paid. As of the date of
     this Agreement, there is no audit examination, deficiency, or refund
     Litigation with respect to any Taxes, except as reserved against any
     Seacoast Financial Statements delivered prior to the date of this Agreement
     or as disclosed in Section 6.17 of the Seacoast Disclosure Memorandum. The
     provision for Taxes due or to become due for any of the Seacoast Entities
     for the period or periods through and including the day of the respective
     Seacoast Financial Statements has been made and is reflected on such
     Seacoast Financial Statements is sufficient to cover all such Taxes.
 
                                   ARTICLE 7
 
                    CONDUCT OF BUSINESS PENDING CONSUMMATION
 
     7.1 Affirmative Covenants of PSHC.  Except as disclosed in Section 7.1 of
the PSHC Disclosure Memorandum with respect to PSNB's proposed Ft. Pierce branch
office, the date of this Agreement until the earlier of the Effective Time or
the termination of this Agreement, unless the prior written consent of Seacoast
shall have been obtained, and except as otherwise expressly contemplated herein,
PSHC shall and shall cause each of its Subsidiaries to operate its business only
in the usual, regular, and ordinary course, and in a manner designed to preserve
intact its business organization and Assets and maintain its rights and
franchises, and shall take no action which would (i) adversely affect the
ability of any Party to obtain any Consents required for the transactions
contemplated hereby without imposition of a condition or restriction of the type
referred to in the last sentences of Section 9.1(b) or 9.1(c), or (ii) adversely
affect the ability of any Party to perform its covenants and agreements under
this Agreement. Furthermore, except for the up to $212,000 of credit, heretofore
committed by PSNB and described in the fourth sentence of Section 5.16 hereof,
any loans, leases or extensions of credit secured by real property originated,
purchased or funded in whole or in part by any PSHC Entity, where the obligor
thereon and the real property related thereto are not both located in St. Lucie,
Martin and/or Indian River Counties, Florida (collectively, the "Counties")
shall conform to the FNMA or FHLMC seller/servicer guidelines applicable to such
Loans and shall be immediately saleable to FNMA and/or FHLMC. PSHC and each PSHC
Entity shall immediately terminate and discontinue purchasing, funding or
otherwise extending credit or committing or agreeing to any of the foregoing
with respect to any loans, extensions of credit, leases and/or mortgages or any
participations or other interests therein from any Wholesale Mortgage Business
and/or any Affiliate of such Wholesale Mortgage Business, except to meet PSNB's
contractual obligations under the existing commitments described in the fourth
sentence of Section 5.16 hereof, and except to purchase and hold as temporary
investments, up to $2.5 million at any time of fully-approved FHA and VA Loans
at any time through April 30, 1997.
 
                                      A-26
<PAGE>   105
 
     7.2 Negative Covenants of PSHC.  From the date of this Agreement until the
earlier of the Effective Time or the termination of this Agreement, unless the
prior written consent of Seacoast shall have been obtained, and except as
otherwise expressly contemplated herein, PSHC covenants and agrees that it will
not do or agree or commit to do, or permit any of its Subsidiaries to do or
agree or commit to do, any of the following:
 
          (a) amend the Articles of Incorporation, Bylaws or other governing
     instruments of any PSHC Entity or, except as expressly contemplated by this
     Agreement, or
 
          (b) incur any additional debt obligation or other obligation for
     borrowed money (other than indebtedness of a PSHC Entity to another PSHC
     Entity) in excess of an aggregate of $50,000 (for the PSHC Entities on a
     consolidated basis) except in the ordinary course of the business of PSHC
     Subsidiaries consistent with past practices (which shall include, for PSHC
     Subsidiaries that are depository institutions, creation of deposit
     liabilities, purchases of federal funds, advances from the Federal Reserve
     Bank or Federal Home Loan Bank, and entry into repurchase agreements fully
     secured by U.S. government or agency securities), or impose, or suffer the
     imposition, on any Asset of any PSHC Entity of any Lien or permit any such
     Lien to exist (other than in connection with deposits, repurchase
     agreements, bankers acceptances, "treasury tax and loan" accounts
     established in the ordinary course of business, the satisfaction of legal
     requirements in the exercise of trust powers, and Liens in effect as of the
     date hereof that are disclosed in the PSHC Disclosure Memorandum); or
 
          (c) repurchase, redeem, or otherwise acquire or exchange (other than
     exchanges in the ordinary course under employee benefit plans), directly or
     indirectly, any shares, or any securities convertible into any shares, of
     the capital stock of any PSHC Entity, or declare or pay any dividend or
     make any other distribution in respect of PSHC's capital stock; or
 
          (d) except for this Agreement, or pursuant to the exercise of stock
     options or warrants or warrants outstanding as of the date hereof and
     pursuant to the terms thereof in existence on the date hereof, or as
     disclosed in Section 7.2(d) of the PSHC Disclosure Memorandum, issue, sell,
     pledge, encumber, authorize the issuance of, enter into any Contract to
     issue, sell, pledge, encumber, or authorize the issuance of, or otherwise
     permit to become outstanding, any additional shares of PSHC Common Stock or
     any other capital stock of any PSHC Entity, or any stock appreciation
     rights, or any option, warrant, or other Equity Right; or
 
          (e) adjust, split, combine or reclassify any capital stock of any PSHC
     Entity or issue or authorize the issuance of any other securities in
     respect of or in substitution for shares of PSHC Common Stock, or sell,
     lease, mortgage or otherwise dispose of or otherwise encumber (x) any
     shares of capital stock of any PSHC Subsidiary (unless any such shares of
     stock are sold or otherwise transferred to another PSHC Entity) or (y) any
     Asset having a book value in excess of $50,000 other than in the ordinary
     course of business for reasonable and adequate consideration; or
 
          (f) (1) except for purchases of U.S. Treasury securities or U.S.
     Government agency securities, which in either case have maturities of one
     year or less, purchase any securities or make any material investment,
     either by purchase of stock or securities, contributions to capital, Asset
     transfers, or purchase of any Assets, in any Person other than a wholly
     owned PSHC Subsidiary, or otherwise acquire direct or indirect control over
     any Person, other than in connection with (i) foreclosures in the ordinary
     course of business, (ii) acquisitions of control by a depository
     institution subsidiary solely in its fiduciary capacity, or (iii) the
     creation of new wholly owned Subsidiaries organized to conduct or continue
     activities otherwise permitted by this Agreement; (2) make any new loans or
     extensions of credit or renew, extend or renegotiate any existing loans or
     extensions of credit (i) with respect to properties or businesses outside
     of the Counties or to borrowers whose principal residence is outside of the
     Counties, (ii) that are unsecured in excess of $100,000, or (iii) that are
     secured in excess of $250,000; (3) purchase or sell (except for sales of
     single family residential first mortgage loans in the ordinary course of
     PSHC's business for fair market value) any whole loans, leases, mortgages
     or any loan participations or agented credits or other interest therein,
     (4) renew or renegotiate any loans or credits that are on any watch list
     and/or are classified or special mentioned or take any similar actions with
     respect to collateral held with
 
                                      A-27
<PAGE>   106
 
     respect to debts previously contracted or other real estate owned, except
     pursuant to safe and sound banking practices and with prior disclosure to
     First National; provided, however, that PSHC may, without the prior notice
     to or written consent of First National, renew or extend existing credits
     on substantially similar terms and conditions as present at the time such
     credit was made or last extended, renewed or modified, for a period not to
     exceed one year and at rates not less than market rates for comparable
     credits and transactions and without any release of any collateral except
     as any PSHC Entity is presently obligated under existing written agreements
     kept as part of such PSHC Entity's official records. If any PSHC Entity
     makes, extends, renews, renegotiates, compromises or settles any loans or
     extensions of credit or releases any collateral therefore that are subject
     to the prior disclosure to First National hereunder and First National has
     objected thereto the Purchase Price shall be reduced on a dollar for dollar
     basis in an amount equal to all outstanding principal of, all accrued but
     unpaid interest and other charges on such loan(s) as of the Closing Date;
     or
 
          (g) grant any increase in compensation or benefits to the employees or
     officers of any PSHC Entity, except in accordance with past practice
     disclosed in Section 7.2(g) of the PSHC Disclosure Memorandum or as
     required by Law; pay any severance or termination pay or any bonus other
     than pursuant to written policies or written Contracts in effect on the
     date of this Agreement and disclosed in Section 7.2(g) of the PSHC
     Disclosure Memorandum; and enter into or amend any severance agreements
     with officers of any PSHC Entity; grant any material increase in fees or
     other increases in compensation or other benefits to directors of any PSHC
     Entity except in accordance with past practice disclosed in Section 7.2(g)
     of the PSHC Disclosure Memorandum; or voluntarily accelerate the vesting of
     any stock options or other stock-based compensation or employee benefits or
     other Equity Rights; or
 
          (h) enter into or amend any employment Contract between any PSHC
     Entity and any Person (unless such amendment is required by Law) that the
     PSHC Entity does not have the unconditional right to terminate without
     Liability (other than Liability for services already rendered), at any time
     on or after the Effective Time; or
 
          (i) adopt any new employee benefit plan of any PSHC Entity or
     terminate or withdraw from, or make any material change in or to, any
     existing employee benefit plans of any PSHC Entity other than any such
     change that is required by Law or that, in the opinion of counsel, is
     necessary or advisable to maintain the tax qualified status of any such
     plan, or make any distributions from such employee benefit plans, except as
     required by Law, the terms of such plans or consistent with past practice;
     or
 
          (j) make any significant change in any Tax or accounting methods or
     systems of internal accounting controls, except as may be appropriate to
     conform to changes in Tax Laws or regulatory accounting requirements or
     GAAP; or
 
          (k) commence any Litigation other than in accordance with past
     practice, settle any Litigation involving any Liability of any PSHC Entity
     for material money damages or restrictions upon the operations of any PSHC
     Entity; or
 
          (l) except in the ordinary course of business and as expressly
     permitted in Section 7.2(f), enter into, modify, amend or terminate any
     material Contract (including any loan Contract with an unpaid balance or
     any Contract calling for payments exceeding $100,000) or waive, release,
     compromise or assign any material rights or claims.
 
     7.3 Covenants of Seacoast.  From the date of this Agreement until the
earlier of the Effective Time or the termination of this Agreement, unless the
prior written consent of PSHC shall have been obtained, and except as otherwise
expressly contemplated herein, Seacoast covenants and agrees that it shall (a)
continue to conduct its business and the business of its Subsidiaries in a
manner designed in its reasonable judgment, to enhance the long-term value of
the Seacoast Capital Stock and the business prospects of the Seacoast Entities
and to the extent consistent therewith use all reasonable efforts to preserve
intact the Seacoast Entities' core businesses and goodwill with their respective
employees and the communities they serve, and (b) take no action which would (i)
materially adversely affect the ability of any Party to obtain any Consents
required for the transactions contemplated hereby without imposition of a
condition or restriction of the type referred to in
 
                                      A-28
<PAGE>   107
 
the last sentences of Section 9.1(b) or 9.1(c), or (ii) materially adversely
affect the ability of any Party to perform its covenants and agreements under
this Agreement; provided, that the foregoing shall not prevent any Seacoast
Entity from acquiring any Assets or other businesses or from discontinuing or
disposing of any of its Assets or business if such action is, in the judgment of
Seacoast, desirable in the conduct of the business of Seacoast and its
Subsidiaries. Seacoast further covenants and agrees that it will not, without
the prior written consent of PSHC, which consent shall not be unreasonably
withheld, amend the Articles of Incorporation or Bylaws of Seacoast, in each
case, in any manner adverse to the holders of PSHC Common Stock as compared to
rights of holders of Seacoast Common Stock generally as of the date of this
Agreement.
 
     7.4 Adverse Changes in Condition.  Each Party agrees to give written notice
promptly to the other Party upon becoming aware of the occurrence or impending
occurrence of any event or circumstance relating to it or any of its
Subsidiaries which (i) is reasonably likely to have, individually or in the
aggregate, a PSHC Material Adverse Effect or a Seacoast Material Adverse Effect,
as applicable, or (ii) would cause or constitute a material breach of any of its
representations, warranties, or covenants contained herein, and to use its
reasonable efforts to prevent or promptly to remedy the same.
 
     7.5 Reports.  Each Party and its Subsidiaries shall file all reports
required to be filed by it with Regulatory Authorities between the date of this
Agreement and the Effective Time and shall deliver to the other Party copies of
all such reports promptly after the same are filed. If financial statements are
contained in any such reports filed with the SEC, such financial statements will
fairly present in all material respects the consolidated financial position of
the entity filing such statements as of the dates indicated and the consolidated
results of operations, changes in shareholders' equity, and cash flows for the
periods then ended in accordance with GAAP (subject in the case of interim
financial statements to normal recurring year-end adjustments that are not
material). As of their respective dates, such reports filed with the SEC will
comply in all material respects with the Securities Laws and will not contain
any untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading. Any financial statements contained in any other reports to another
Regulatory Authority shall be prepared in accordance with Laws applicable to
such reports.
 
                                   ARTICLE 8
 
                             ADDITIONAL AGREEMENTS
 
     8.1 Registration Statement; Proxy Statement; Shareholder Approval.  As soon
as reasonably practicable after execution of this Agreement, at a date
determined by Seacoast in its sole discretion, Seacoast shall prepare and file
the Registration Statement with the SEC, and shall use its reasonable efforts to
cause the Registration Statement to become effective under the 1933 Act and take
any action required to be taken under the applicable state Blue Sky or
securities Laws in connection with the issuance of the shares of Seacoast Common
Stock upon consummation of the Merger. PSHC shall cooperate in the preparation
and filing of the Registration Statement and shall furnish all information
concerning it and the holders of its capital stock as Seacoast may reasonably
request in connection with such action. PSHC shall call a Shareholders' Meeting,
to be held as soon as reasonably practicable after the Registration Statement is
declared effective by the SEC, for the purpose of voting upon approval of this
Agreement and such other related matters as it deems appropriate. Seacoast shall
call a Shareholders' Meeting, to be held as soon as reasonably practicable after
the Registration Statement is declared effective by the SEC, for the purpose of
voting upon the issuance of shares of Seacoast Common Stock pursuant to the
Merger and such other related matters as it deems appropriate. In connection
with the Shareholders' Meetings, (i) PSHC and Seacoast shall prepare and file
with the SEC a Joint Proxy Statement and mail such Joint Proxy Statement to
their respective shareholders, (ii) the Parties shall furnish to each other all
information concerning them that they may reasonably request in connection with
such Joint Proxy Statement, (iii) the Board of Directors of PSHC and Seacoast
shall recommend to their respective shareholders the approval of the matters
submitted for approval, and (iv) the Board of Directors and officers of PSHC and
Seacoast shall use their reasonable efforts to obtain such shareholders'
approval. Seacoast and PSHC shall make all necessary filings with respect to the
Merger under the Securities Laws.
 
                                      A-29
<PAGE>   108
 
     8.2 Nasdaq Listing.  Seacoast shall use its reasonable efforts to list,
prior to the Effective Time, on the Nasdaq National Market the shares of
Seacoast Common Stock to be issued to the holders of PSHC Common Stock pursuant
to the Merger, and Seacoast shall give all notices and make all filings with the
NASD required in connection with the transactions contemplated herein.
 
     8.3 Applications.  Seacoast shall promptly prepare and file, and PSHC shall
cooperate in the preparation and, where appropriate, filing of, applications
with all Regulatory Authorities having jurisdiction over the transactions
contemplated by this Agreement seeking the requisite Consents necessary to
consummate the transactions contemplated by this Agreement. The Parties shall
deliver to each other copies of all filings, correspondence and orders to and
from all Regulatory Authorities in connection with the transactions contemplated
hereby.
 
     8.4 Filings with State Offices.  Upon the terms and subject to the
conditions of this Agreement, Seacoast shall execute and file the Articles of
Merger with the Secretary of State of the State of Florida in connection with
the Closing.
 
     8.5 Agreement as to Efforts to Consummate.  Subject to the terms and
conditions of this Agreement, each Party agrees to use, and to cause its
Subsidiaries to use, its reasonable efforts to take, or cause to be taken, all
actions, and to do, or cause to be done, all things necessary, proper, or
advisable under applicable Laws to consummate and make effective, as soon as
reasonably practicable after the date of this Agreement, the transactions
contemplated by this Agreement, including using its reasonable efforts to lift
or rescind any Order adversely affecting its ability to consummate the
transactions contemplated herein and to cause to be satisfied the conditions
referred to in Article 9; provided, that nothing herein shall preclude either
Party from exercising its rights under this Agreement. Each Party shall use, and
shall cause each of its Subsidiaries to use, its reasonable efforts to obtain
all Consents necessary or desirable for the consummation of the transactions
contemplated by this Agreement.
 
     8.6 Investigation and Confidentiality.  (a) Prior to the Effective Time,
each Party shall keep the other Party advised of all material developments
relevant to its business and to consummation of the Merger and shall permit the
other Party to make or cause to be made such investigation of the business and
properties of it and its Subsidiaries and of their respective financial and
legal conditions as the other Party reasonably requests, provided that such
investigation shall be reasonably related to the transactions contemplated
hereby and shall not interfere unnecessarily with normal operations. No
investigation by a Party shall affect the representations and warranties of the
other Party.
 
     (b) In addition to the Parties' respective obligations under the
Confidentiality Agreement, which are hereby reaffirmed and adopted, and
incorporated by reference herein each Party shall, and shall cause its advisers
and agents to, maintain the confidentiality of all confidential information
furnished to it by the other Party concerning its and its Subsidiaries'
businesses, operations, and financial positions and shall not use such
information for any purpose except in furtherance of the transactions
contemplated by this Agreement. In the event that a Party is required by
applicable law or valid court process to disclose any such confidential
information then such Party shall provide the other Party with prompt written
notice of any such requirement so that the other Party may seek a protective
order or other appropriate remedy and/or waive compliance with this Section 8.6.
If in the absence of a protective order or other remedy or the receipt of a
waiver by the other Party, a Party is nonetheless, in the written opinion of
counsel, legally compelled to disclose any such confidential information to any
tribunal or else stand liable for contempt or suffer other censure or penalty, a
Party may, without liability hereunder, disclose to such tribunal only that
portion of the confidential information which such counsel advises such Party is
legally required to be disclosed, provided that such disclosing Party use its
best efforts to preserve the confidentiality of such confidential information,
including without limitation, by cooperating with the other Party to obtain an
appropriate protective order or other reliable assurance that confidential
treatment will be accorded such confidential information by such tribunal. If
this Agreement is terminated prior to the Effective Time, each Party shall
promptly return or certify the destruction of all documents and copies thereof,
and all work papers containing confidential information received from the other
Party.
 
                                      A-30
<PAGE>   109
 
     (c) PSHC shall use its reasonable efforts to exercise its rights under
confidentiality agreements entered into with Persons, if any, which were
considering an Acquisition Proposal with respect to PSHC to preserve the
confidentiality of the information relating to the PSHC Entities provided to
such Persons and their Affiliates and Representatives.
 
     (d) Each Party agrees to give the other Party notice as soon as practicable
after any determination by it of any fact or occurrence relating to the other
Party which it has discovered through the course of its investigation and which
represents, or is reasonably likely to represent, either a material breach of
any representation, warranty, covenant or agreement of the other Party or which
has had or is reasonably likely to have a PSHC Material Adverse Effect or a
Seacoast Material Adverse Effect, as applicable.
 
     8.7 Press Releases.  Prior to the Effective Time, PSHC and Seacoast shall
consult with each other as to the form and substance of any press release or
other public disclosure materially related to this Agreement or any other
transaction contemplated hereby; provided, that nothing in this Section 8.7
shall be deemed to prohibit any Party from making any disclosure which its
counsel deems necessary or advisable in order to satisfy such Party's disclosure
obligations imposed by Law.
 
     8.8 Certain Actions.  Except with respect to this Agreement and the
transactions contemplated hereby, no PSHC Entity nor any Affiliate thereof nor
any Representatives thereof retained by any PSHC Entity shall directly or
indirectly solicit any Acquisition Proposal by any Person. Except to the extent
the Board of Directors of PSHC, after having consulted with and considered the
advice of outside counsel, reasonably determines in good faith that the failure
to take such actions would constitute a breach of fiduciary duties of the
members of such Board of Directors to PSHC's shareholder under applicable law,
no PSHC Entity or any Affiliate or Representative thereof shall furnish any
non-public information that it is not legally obligated to furnish, negotiate
with respect to, or enter into any Contract with respect to, any Acquisition
Proposal, but PSHC may communicate information about such an Acquisition
Proposal to its shareholders if and to the extent that it is required to do so
in order to comply with its legal obligations. PSHC shall promptly advise
Seacoast following the receipt of any Acquisition Proposal and the details
thereof, and advise Seacoast of any developments with respect to such
Acquisition Proposal promptly upon the occurrence thereof. PSHC shall (i)
immediately cease and cause to be terminated any existing activities,
discussions or negotiations with any Persons conducted heretofore with respect
to any of the foregoing, and (ii) direct and use its reasonable efforts to cause
all of its Affiliates and Representatives not to engage in any of the foregoing.
 
     8.9 Accounting and Tax Treatment.  Each of the Parties undertakes and
agrees to use its reasonable efforts to cause the Merger, and to use its
reasonable efforts to take no action which would cause the Merger not, to
qualify for treatment as a pooling of interests for accounting purposes or as a
"reorganization" within the meaning of Section 368(a) of the Internal Revenue
Code for federal income tax purposes.
 
     8.10 State Takeover Laws.  Each PSHC Entity and each PSHC shareholder shall
take the necessary steps to exempt the transactions contemplated by this
Agreement from, or if necessary to challenge the validity or applicability of,
any applicable Takeover Law, including the FBCA.
 
     8.11 Charter Provisions.  Except as required by applicable Law or as
otherwise provided in this Agreement, each PSHC Entity shall take all necessary
action to ensure that the entering into of this Agreement and the consummation
of the Merger and the other transactions contemplated hereby do not and will not
result in the grant of any rights to any Person under the Articles of
Incorporation, Bylaws or other governing instruments of any PSHC Entity or
restrict or impair the ability of Seacoast or any of its Subsidiaries to vote,
or otherwise to exercise the rights of a shareholder with respect to, shares of
any PSHC Entity that may be directly or indirectly acquired or controlled by
them.
 
     8.12 PSHC Meetings.  Each PSHC Entity shall give prior notice of each
meeting or proposed action by any of their respective Boards of Directors and/or
committees, including a description of any matters to be discussed and/or acted
upon, and shall permit a representative of Seacoast to attend each such meeting,
except during discussions relating to the transactions contemplated herein that
present conflict of interest and/or confidentiality issues.
 
                                      A-31
<PAGE>   110
 
     8.13 Agreement of Affiliates.  PSHC has disclosed in Section 8.13 of the
PSHC Disclosure Memorandum all Persons whom it reasonably believes is an
"affiliate" of PSHC for purposes of Rule 145 under the 1933 Act. PSHC shall use
its reasonable efforts to cause each such Person to deliver to Seacoast upon the
execution of this Agreement a written agreement, substantially in the form of
Exhibit 2, providing that such Person will not sell, pledge, transfer, or
otherwise dispose of the shares of PSHC Common Stock held by such Person except
as contemplated by such agreement or by this Agreement and will not sell,
pledge, transfer, or otherwise dispose of the shares of Seacoast Common Stock to
be received by such Person upon consummation of the Merger except in compliance
with applicable provisions of the 1933 Act and the rules and regulations
thereunder and, until such time as financial results covering at least 30 days
of combined operations of Seacoast and PSHC have been published within the
meaning of Section 201.01 of the SEC's Codification of Financial Reporting
Policies. Shares of Seacoast Common Stock issued to such affiliates of PSHC in
exchange for shares of PSHC Common Stock shall not be transferable until such
time as financial results covering at least 30 days of combined operations of
Seacoast and PSHC have been published within the meaning of Section 201.01 of
the SEC's Codification of Financial Reporting Policies, regardless of whether
each such affiliate has provided the written agreement referred to in this
Section 8.13 (and Seacoast shall be entitled to place restrictive legends upon
certificates for shares of Seacoast Common Stock issued to affiliates of PSHC
pursuant to this Agreement to enforce the provisions of this Section 8.13;
provided that Seacoast removes such legends at the appropriate time). Seacoast
shall not be required to maintain the effectiveness of the Registration
Statement under the 1933 Act for the purposes of resale of Seacoast Common Stock
by such affiliates.
 
     8.14 Employee Benefits and Contracts.  (a) Following the Effective Time,
Seacoast shall provide generally to officers and employees of the PSHC Entities
employee benefits under employee benefit and welfare plans (other than stock
option or other plans involving the potential issuance of Seacoast Common
Stock), on terms and conditions which when taken as a whole are substantially
similar to those currently provided by the Seacoast Entities to their similarly
situated officers and employees; provided, that, for a period of 12 months after
the Effective Time, Seacoast shall provide generally to officers and employees
of PSHC Entities severance benefits in accordance with the policies of either
(i) PSHC as disclosed in Section 8.14 of the PSHC Disclosure Memorandum, or (ii)
Seacoast, whichever of (i) or (ii) will provide the greater benefit to the
officer or employee. Seacoast shall waive any pre-existing condition exclusion
under any employee health plan for which any employees and/or officers and
dependents covered by PSHC plans as of Closing of the PSHC Entities shall become
eligible by virtue of the preceding sentence, to the extent (i) such pre-
existing condition was covered under the corresponding plan maintained by the
PSHC Entity and (ii) the individual affected by the pre-existing condition was
covered by the PSHC Entity's corresponding plan on the date which immediately
precedes the Effective Time, provided that PSHC has disclosed in Section 8.14 of
the PSHC Disclosure Memorandum and at Closing that none of its employees,
officers or other participants or their respective dependents, to the best of
PSHC and PSNB's knowledge and belief, have any long-term disabilities or
conditions, which in the reasonable judgment of Seacoast would materially
adversely affect the claims experience and/or costs of any employee benefit plan
or insurance maintained by or through any Seacoast Entity. For purposes of
participation, vesting and (except in the case of Seacoast retirement plans)
benefit accrual under Seacoast's employee benefit plans, the service of the
employees of the PSHC Entities prior to the Effective Time shall be treated as
service with a Seacoast Entity participating in such employee benefit plans.
Seacoast also shall cause the Surviving Corporation and its Subsidiaries to
honor in accordance with their terms all employment, severance, consulting and
other compensation Contracts disclosed in Section 8.14 of the PSHC Disclosure
Memorandum to Seacoast between any PSHC Entity and any current or former
director, officer, or employee thereof, and all provisions for vested benefits
or other vested amounts earned or accrued through the Effective Time under the
PSHC Benefit Plans.
 
     (b) Upon the execution hereof, a mutually acceptable employment agreement
between J. Hal Roberts, Jr. and Seacoast or First National shall be executed and
delivered, and which shall become effective at the Effective Time.
 
                                      A-32
<PAGE>   111
 
     (c) Subject to compliance with applicable Laws and the absence of any
Material Adverse Effects upon Seacoast or any PSHC Benefit Plans and/or Seacoast
Benefit Plans, Seacoast intends to merge the PSHC 401(k) Plan with the Seacoast
401(k) Plan.
 
     (d) Effective upon the Effective Time, PSHC and, as applicable, its
Subsidiaries shall terminate, their Employee Non-Qualified Stock Investment Plan
and Trust of Port St. Lucie National Bank and the Deferred Compensation Plan
offered to Directors. Such termination and the effects thereof shall be in
accordance with Section 5.15(h) hereof
 
     8.15 Indemnification.  (a) With respect to all claims brought during the
period of four years after the Effective Time, Seacoast shall indemnify, defend
and hold harmless the present and former directors, officers, employees and
agents of the PSHC Entities (each, an "Indemnified Party") against all
Liabilities arising out of actions or omissions arising out of the Indemnified
Party's service or services as directors, officers, employees or agents of PSHC
or, at PSHC's request, of another corporation, partnership, joint venture, trust
or other enterprise occurring at or prior to the Effective Time (including the
transactions contemplated by this Agreement) to the fullest extent permitted
under Florida Law and by PSHC's Articles of Incorporation and Bylaws as in
effect on the date hereof, including provisions relating to advances of expenses
incurred in the defense of any Litigation and whether or not any Seacoast Entity
is insured against any such matter. Without limiting the foregoing, in any case
in which approval by the Surviving Corporation is required to effectuate any
indemnification, the Surviving Corporation shall direct, at the election of the
Indemnified Party, that the determination of any such approval shall be made by
independent counsel mutually agreed upon between Seacoast and the Indemnified
Party.
 
     (b) Seacoast shall, to the extent available, (and PSHC shall cooperate
prior to the Effective Time in these efforts) maintain in effect for a period of
two years after the Effective Time PSHC's existing directors' and officers'
liability insurance policy (provided that Seacoast may substitute therefor (i)
policies of at least the same coverage and amounts containing terms and
conditions which are substantially no less advantageous or (ii) with the consent
of PSHC given prior to the Effective Time, any other policy) with respect to
claims arising from facts or events which occurred prior to the Effective Time
and covering persons who are currently covered by such insurance; provided, that
Seacoast shall not be obligated to make aggregate premium payments for such
two-year period in respect of such policy (or coverage replacing such policy)
which exceed, for the portion related to PSHC's directors and officers, 150% of
the annual premium payments on PSHC's current policy in effect as of the date of
this Agreement (the "Maximum Amount").
 
     (c) Any Indemnified Party wishing to claim indemnification under paragraph
(a) of this Section 8.15, upon learning of any such Liability or Litigation,
shall promptly notify Seacoast thereof. In the event of any such Litigation
(whether arising before or after the Effective Time), (i) the Surviving
Corporation shall have the right to assume the defense thereof and the Surviving
Corporation shall not be liable to such Indemnified Parties for any legal
expenses of other counsel or any other expenses subsequently incurred by such
Indemnified Parties in connection with the defense thereof, except that if the
Surviving Corporation elects not to assume such defense or counsel for the
Indemnified Parties advises that there are substantive issues which raise
conflicts of interest between the Surviving Corporation and the Indemnified
Parties, the Indemnified Parties may retain counsel satisfactory to them, and
the Surviving Corporation shall pay all reasonable fees and expenses of such
counsel for the Indemnified Parties promptly as statements therefor are
received; provided, that the Surviving Corporation shall be obligated pursuant
to this paragraph (c) to pay for only one firm of counsel for all Indemnified
Parties in any jurisdiction, (ii) the Indemnified Parties will cooperate in the
defense of any such Litigation, and (iii) the Surviving Corporation shall not be
liable for any settlement effected without its prior written consent; and
provided further that the Surviving Corporation shall not have any obligation
hereunder to any Indemnified Party when and if a court of competent jurisdiction
shall determine, and such determination shall have become final, that the
indemnification of such Indemnified Party in the manner contemplated hereby is
prohibited by applicable Law.
 
     8.16 Certain Policies of PSHC.  Seacoast and PSHC shall consult with
respect to their respective loan, litigation and real estate valuation policies
and practices (including loan classifications and levels of reserves) and PSHC
shall make such modification or changes to its policies and practices, if any,
prior to the Effective
 
                                      A-33
<PAGE>   112
 
Time as may be mutually agreed upon. Seacoast and PSHC also shall consult with
respect to the character, amount and timing of restructuring and Merger-related
expense charges to be taken by each of the Parties in connection with the
transactions contemplated by this Agreement and shall take such charges in
accordance with GAAP, prior to the Effective Time, as may be mutually agreed
upon by the Parties. Neither Party's representations, warranties, covenants or
agreements contained in this Agreement shall be deemed to be inaccurate or
breached in any respect as a consequence of any modifications or charges
undertaken solely on account of this Section 8.16.
 
     8.17 Nomination and Election of Directors.  Seacoast shall as soon as
practicable following the Effective Time nominate and use its best efforts to
cause to be elected to the Seacoast and First National Board of Directors two
candidates from the current PSHC Board of Directors. In addition, Seacoast shall
cause First National to amend its Bylaws as soon as practicable following the
Effective Time to provide for one or more First National Advisory Boards,
including an First National Advisory Board for Port St. Lucie County. Seacoast
shall cause each of the current directors of PSHC (other than such PSHC and/or
PSNB directors who are elected as directors of Seacoast and/or First National)
to be nominated and elected to the First National Advisory Board for St. Lucie
County as soon as practicable after such Advisory Board is constituted according
to the preceding sentence.
 
                                   ARTICLE 9
 
               CONDITIONS PRECEDENT TO OBLIGATIONS TO CONSUMMATE
 
     9.1 Conditions to Obligations of Each Party.  The respective obligations of
each Party to perform this Agreement and consummate the Merger and the other
transactions contemplated hereby are subject to the satisfaction of the
following conditions, unless waived by both Parties pursuant to Section 11.6:
 
          (a) Shareholder Approval.  The shareholders of PSHC shall have
     approved this Agreement, and the consummation of the transactions
     contemplated hereby, including the Merger, as and to the extent required by
     Law, by the provisions of any governing instruments, or by the rules of the
     NASD. The shareholders of Seacoast shall have approved the issuance of
     shares of Seacoast Common Stock pursuant to the Merger, as and to the
     extent required by Law, by the provisions of any governing instruments, or
     by the rules of the NASD.
 
          (b) Regulatory Approvals.  All Consents of, filings and registrations
     with, and notifications to, all Regulatory Authorities required for
     consummation of the Merger shall have been obtained or made and shall be in
     full force and effect and all waiting periods required by Law shall have
     expired. No Consent obtained from any Regulatory Authority which is
     necessary to consummate the transactions contemplated hereby shall be
     conditioned or restricted in a manner (including requirements relating to
     the raising of additional capital or the disposition of Assets) which in
     the reasonable judgment of the Board of Directors of Seacoast would so
     materially adversely affect the economic or business benefits of the
     transactions contemplated by this Agreement that, had such condition or
     requirement been known, such Party would not, in its reasonable judgment,
     have entered into this Agreement.
 
          (c) Consents and Approvals.  Each Party shall have obtained any and
     all Consents required for consummation of the Merger (other than those
     referred to in Section 9.1(b)) or for the preventing of any Default under
     any Contract or Permit of such Party which, if not obtained or made, is
     reasonably likely to have, individually or in the aggregate, a PSHC
     Material Adverse Effect or a Seacoast Material Adverse Effect, as
     applicable. No Consent so obtained which is necessary to consummate the
     transactions contemplated hereby shall be conditioned or restricted in a
     manner which in the reasonable judgment of the Board of Directors of
     Seacoast would so materially adversely affect the economic or business
     benefits of the transactions contemplated by this Agreement that, had such
     condition or requirement been known, such Party would not, in its
     reasonable judgment, have entered into this Agreement.
 
          (d) Legal Proceedings.  No court or governmental or regulatory
     authority of competent jurisdiction shall have enacted, issued,
     promulgated, enforced or entered any Law or Order (whether temporary,
 
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<PAGE>   113
 
     preliminary or permanent) or taken any other action which prohibits,
     restricts or makes illegal consummation of the transactions contemplated by
     this Agreement.
 
          (e) Registration Statement.  The Registration Statement shall be
     effective under the 1933 Act, no stop orders suspending the effectiveness
     of the Registration Statement shall have been issued, no action, suit,
     proceeding or investigation by the SEC to suspend the effectiveness thereof
     shall have been initiated and be continuing, and all necessary approvals
     under state securities Laws or the 1933 Act or 1934 Act relating to the
     issuance or trading of the shares of Seacoast Common Stock issuable
     pursuant to the Merger shall have been received.
 
          (f) Share Listing.  The shares of Seacoast Common Stock issuable
     pursuant to the Merger shall have been approved for listing on the Nasdaq
     National Market.
 
          (g) Pooling Letters.  Each of the Parties shall have received letters,
     dated as of the date of filing of the Registration Statement with the SEC
     and as of the Effective Time, addressed to Seacoast, in form and substance
     reasonably acceptable to Seacoast, from Arthur Andersen LLP to the effect
     that the Merger will qualify for pooling-of-interests accounting treatment.
     Each of the Parties also shall have received letters, dated as of the date
     of filing of the Registration Statement with the SEC and as of the
     Effective Time, addressed to Seacoast, in form and substance reasonably
     acceptable to Seacoast, from KPMG Peat Marwick to the effect that such firm
     is not aware of any matters relating to PSHC and its Subsidiaries which
     would preclude the Merger from qualifying for pooling-of-interests
     accounting treatment.
 
          (h) Tax Matters.  Each Party shall have received a written opinion of
     counsel from Alston & Bird, in form reasonably satisfactory to such Parties
     (the "Tax Opinion"), to the effect that (i) the Merger will constitute a
     reorganization within the meaning of Section 368(a) of the Internal Revenue
     Code, (ii) the exchange in the Merger of PSHC Common Stock for Seacoast
     Common Stock will not give rise to gain or loss to the shareholders of PSHC
     with respect to such exchange (except to the extent of any cash received),
     and (iii) none of PSHC or Seacoast will recognize gain or loss as a
     consequence of the Merger (except for amounts resulting from any required
     change in accounting methods and any income and deferred gain recognized
     pursuant to Treasury regulations issued under Section 1502 of the Internal
     Revenue Code). In rendering such Tax Opinion, such counsel shall be
     entitled to rely upon representations of officers of PSHC and Seacoast
     reasonably satisfactory in form and substance to such counsel.
 
     9.2 Conditions to Obligations of Seacoast.  The obligations of Seacoast to
perform this Agreement and consummate the Merger and the other transactions
contemplated hereby are subject to the satisfaction of the following conditions,
unless waived by Seacoast pursuant to Section 11.6(a):
 
          (a) Representations and Warranties.  For purposes of this Section
     9.2(a), the accuracy of the representations and warranties of PSHC set
     forth in this Agreement shall be assessed as of the date of this Agreement
     and as of the Effective Time with the same effect as though all such
     representations and warranties had been made on and as of the Effective
     Time (provided that representations and warranties which are confined to a
     specified date shall speak only as of such date). The representations and
     warranties set forth in Section 5.3, 5.20, 5.21, and 5.22 shall be true and
     correct (except for inaccuracies which are de minimus in amount). There
     shall not exist inaccuracies in the representations and warranties of PSHC
     set forth in this Agreement (including the representations and warranties
     set forth in Sections 5.3, 5.20, 5.21, and 5.22) such that the aggregate
     effect of such inaccuracies has, or is reasonably likely to have, a PSHC
     Material Adverse Effect; provided that, for purposes of this sentence only,
     those representations and warranties which are qualified by references to
     "material" or "Material Adverse Effect" or to the "Knowledge" of any Person
     shall be deemed not to include such qualifications.
 
          (b) Performance of Agreements and Covenants.  Each and all of the
     agreements and covenants of PSHC to be performed and complied with pursuant
     to this Agreement and the other agreements contemplated hereby prior to the
     Effective Time shall have been duly performed and complied with.
 
          (c) Certificates.  PSHC shall have delivered to Seacoast (i) a
     certificate, dated as of the Effective Time and signed on its behalf by its
     chief executive officer and its chief financial officer, to the effect that
 
                                      A-35
<PAGE>   114
 
     the conditions set forth in Section 9.1 as relates to PSHC and in Section
     9.2(a) and 9.2(b) have been satisfied, and (ii) certified copies of
     resolutions duly adopted by PSHC's Board of Directors and shareholders
     evidencing the taking of all corporate action necessary to authorize the
     execution, delivery and performance of this Agreement, and the consummation
     of the transactions contemplated hereby, all in such reasonable detail as
     Seacoast and its counsel shall request.
 
          (d) Opinion of Counsel.  Seacoast shall have received an opinion of
     Gunster, Yoakley, Valdes-Fauli & Stewart, P.A, counsel to PSHC, dated as of
     the Closing, in form reasonably satisfactory to Seacoast, as to the matters
     set forth in Exhibit 3.
 
          (e) Accountant's Letters.  Seacoast shall have received from KPMG Peat
     Marwick letters dated not more than five days prior to (i) the date of the
     Joint Proxy Statement and (ii) the Effective Time, with respect to certain
     financial information regarding PSHC, in form and substance reasonably
     satisfactory to Seacoast, which letters shall be based upon customary
     specified procedures undertaken by such firm in accordance with Statement
     of Auditing Standard Nos. 71, 72 and 75.
 
          (f) Affiliates' Agreements.  Seacoast shall have received from each
     affiliate of PSHC the affiliates letter referred to in Section 8.13, to the
     extent necessary to assure in the reasonable judgment of Seacoast that the
     transactions contemplated hereby will qualify for pooling-of-interests
     accounting treatment.
 
          (g) Shareholders' Equity.  PSHC's shareholders' equity as of the
     Closing shall not be less than PSHC's shareholders' equity as of December
     31, 1996, excluding for purposes of the calculation of such shareholders'
     equity the effects of (i) all costs, fees and charges, including fees and
     charges of PSHC's accountants, counsel and financial advisors, whether or
     not accrued or paid, that are related to the transactions contemplated by
     this Agreement not to exceed $200,000 in the aggregate, (ii) all net
     charges resulting from the application of FASB Statement No. 115 with
     respect to unrealized securities gains and losses, and (iii) any reductions
     in PSHC's shareholders' equity resulting from any actions or changes in
     policies of PSHC taken at the request of Seacoast, including those
     described in Section 8.16 and (iv) the effect on or after the Effective
     Time, as Seacoast may determine, of the PSHC and/or PSNB data processing
     agreements as shown in Section 9.2(g) of the PSHC Disclosure Memorandum.
 
          (h) Director's Agreements.  Seacoast shall have received from each
     director of PSHC the Director's Agreement set forth hereto at Exhibit 4.
 
          (i) Claims Letter.  Seacoast shall have received from each director
     and officer of PSHC the Claims Letter set forth hereto at Exhibit 5.
 
     9.3 Conditions to Obligations of PSHC.  The obligations of PSHC to perform
this Agreement and consummate the Merger and the other transactions contemplated
hereby are subject to the satisfaction of the following conditions, unless
waived by PSHC pursuant to Section 11.6(b):
 
          (a) Representations and Warranties.  For purposes of this Section
     9.3(a), the accuracy of the representations and warranties of Seacoast set
     forth in this Agreement shall be assessed as of the date of this Agreement
     and as of the Effective Time with the same effect as though all such
     representations and warranties had been made on and as of the Effective
     Time (provided that representations and warranties which are confined to a
     specified date shall speak only as of such date). There shall not exist
     inaccuracies in the representations and warranties of Seacoast set forth in
     this Agreement such that the aggregate effect of such inaccuracies has, or
     is reasonably likely to have, a Seacoast Material Adverse Effect; provided
     that, for purposes of this sentence only, those representations and
     warranties which are qualified by references to "material" or "Material
     Adverse Effect" or to the "Knowledge" of any Person shall be deemed not to
     include such qualifications.
 
          (b) Performance of Agreements and Covenants.  Each and all of the
     agreements and covenants of Seacoast to be performed and complied with
     pursuant to this Agreement and the other agreements contemplated hereby
     prior to the Effective Time shall have been duly performed and complied
     with in all material respects.
 
                                      A-36
<PAGE>   115
 
          (c) Certificates.  Seacoast shall have delivered to PSHC (i) a
     certificate, dated as of the Effective Time and signed on its behalf by its
     chief executive officer and its chief financial officer, to the effect that
     the conditions set forth in Section 9.1 as relates to Seacoast and in
     Section 9.3(a) and 9.3(b) have been satisfied, and (ii) certified copies of
     resolutions duly adopted by Seacoast's Board of Directors and shareholders
     evidencing the taking of all corporate action necessary to authorize the
     execution, delivery and performance of this Agreement, and the consummation
     of the transactions contemplated hereby, all in such reasonable detail as
     PSHC and its counsel shall request.
 
          (d) Opinion of Counsel.  PSHC shall have received an opinion of Alston
     & Bird, counsel to Seacoast, dated as of the Effective Time, in form
     reasonably acceptable to PSHC, as to the matters set forth in Exhibit 6.
 
          (e) Fairness Opinion.  PSHC shall have received from Austin
     Associates, Inc. a letter, dated not more than five business days prior to
     the date of the Proxy Statement, to the effect that, in the opinion of such
     firm, the consideration to be received by PSHC shareholders in connection
     with the Merger is fair, from a financial point of view, to such
     shareholders.
 
                                   ARTICLE 10
 
                                  TERMINATION
 
     10.1 Termination.  Notwithstanding any other provision of this Agreement,
and notwithstanding the approval of this Agreement by the shareholders of PSHC
and Seacoast or both, this Agreement may be terminated and the Merger abandoned
at any time prior to the Effective Time:
 
          (a) By mutual consent of Seacoast and PSHC; or
 
          (b) By either Party (provided that the terminating Party is not then
     in material breach of any representation, warranty, covenant, or other
     agreement contained in this Agreement) in the event of a breach by the
     other Party of any representation or warranty contained in this Agreement
     which cannot be or has not been cured within 30 days after the giving of
     written notice to the breaching Party of such breach and which breach is
     reasonably likely, in the opinion of the non-breaching Party, to have,
     individually or in the aggregate, a PSHC Material Adverse Effect or a
     Seacoast Material Adverse Effect, as applicable, on the breaching Party; or
 
          (c) By either Party (provided that the terminating Party is not then
     in material breach of any representation, warranty, covenant, or other
     agreement contained in this Agreement) in the event of a material breach by
     the other Party of any covenant or agreement contained in this Agreement
     which cannot be or has not been cured within 30 days after the giving of
     written notice to the breaching Party of such breach; or
 
          (d) By either Party (provided that the terminating Party is not then
     in material breach of any representation, warranty, covenant, or other
     agreement contained in this Agreement) in the event (i) any Consent of any
     Regulatory Authority required for consummation of the Merger and the other
     transactions contemplated hereby shall have been denied by final
     nonappealable action of such authority or if any action taken by such
     authority is not appealed within the time limit for appeal, or (ii) the
     shareholders of PSHC or Seacoast fail to vote their approval of the matters
     relating to this Agreement and the transactions contemplated hereby at the
     Shareholders' Meetings where such matters were presented to such
     shareholders for approval and voted upon; or
 
          (e) By either Party in the event that the Merger shall not have been
     consummated by August 31, 1997, if the failure to consummate the
     transactions contemplated hereby on or before such date is not caused by
     any breach of this Agreement by the Party electing to terminate pursuant to
     this Section 10.1(e); or
 
          (f) By either Party (provided that the terminating Party is not then
     in material breach of any representation, warranty, covenant, or other
     agreement contained in this Agreement) in the event that
 
                                      A-37
<PAGE>   116
 
     any of the conditions precedent to the obligations of such Party to
     consummate the Merger cannot be satisfied or fulfilled by the date
     specified in Section 10.1(e); or
 
          (g) By Seacoast, in the event that the Board of Directors of PSHC
     shall have failed to reaffirm its approval of the Merger and the
     transactions contemplated by this Agreement (to the exclusion of any other
     Acquisition Proposal), or shall have resolved not to reaffirm the Merger,
     or shall have affirmed, recommended or authorized entering into any other
     Acquisition Proposal or other transaction involving a merger, share
     exchange, consolidation or transfer of substantially all of the Assets of
     PSHC.
 
     (h) By PSHC in the event that the Purchase Price Per Share shall be less
than $24.62.
 
     10.2 Effect of Termination.  In the event of the termination and
abandonment of this Agreement pursuant to Section 10.1, this Agreement shall
become void and have no effect, except that (i) the provisions of this Section
10.2 and Article 11 and Sections 8.6(b) and 8.7 shall survive any such
termination and abandonment, and (ii) a termination pursuant to Sections
10.1(b), 10.1(c) or 10.1(f) shall not relieve the breaching Party from Liability
for an uncured willful breach of a representation, warranty, covenant, or
agreement giving rise to such termination.
 
     10.3 Non-Survival of Representations and Covenants.  The respective
representations, warranties, obligations, covenants, and agreements of the
Parties shall not survive the Effective Time except this Section 10.3 and
Articles 1, 2, 3, 4 and 11 and Sections 8.7, 8.13, 8.14, 8.15 and 8.17.
 
                                   ARTICLE 11
 
                                 MISCELLANEOUS
 
     11.1 Definitions.  (a) Except as otherwise provided herein, the capitalized
terms set forth below shall have the following meanings:
 
          "1933 Act" shall mean the Securities Act of 1933, as amended.
 
          "1934 Act" shall mean the Securities Exchange Act of 1934, as amended.
 
          "Acquisition Proposal" with respect to a Party shall mean any tender
     offer or exchange offer or any proposal for a merger, acquisition of all of
     the stock or assets of, or other business combination involving the
     acquisition of such Party or any of its Subsidiaries or the acquisition of
     a substantial equity interest in, or a substantial portion of the assets
     of, such Party or any of its Subsidiaries.
 
          "Affiliate" of a Person shall mean: (i) any other Person directly, or
     indirectly through one or more intermediaries, controlling, controlled by
     or under common control with such Person; (ii) any officer, director,
     partner, employer, or direct or indirect beneficial owner of any 10% or
     greater equity or voting interest of such Person; or (iii) any other Person
     for which a Person described in clause (ii) acts in any such capacity.
 
          "Agreement" shall mean this Agreement and Plan of Merger, including
     the Exhibits delivered pursuant hereto and incorporated herein by
     reference.
 
          "Articles of Merger" shall mean the Articles of Merger to be executed
     by Seacoast and filed with the Secretary of State of the State of Florida
     relating to the Merger as contemplated by Section 1.1.
 
          "Assets" of a Person shall mean all of the assets, properties,
     businesses and rights of such Person of every kind, nature, character and
     description, whether real, personal or mixed, tangible or intangible,
     accrued or contingent, or otherwise relating to or utilized in such
     Person's business, directly or indirectly, in whole or in part, whether or
     not carried on the books and records of such Person, and whether or not
     owned in the name of such Person or any Affiliate of such Person and
     wherever located.
 
          "BHC Act" shall mean the federal Bank Holding Company Act of 1956, as
     amended.
 
          "Closing Date" shall mean the date on which the Closing occurs.
 
                                      A-38
<PAGE>   117
 
          "Confidentiality Agreement" shall mean that certain Confidentiality
     Agreement, dated May 10, 1996, between PSHC and Seacoast.
 
          "Consent" shall mean any consent, approval, authorization, clearance,
     exemption, waiver, or similar affirmation by any Person pursuant to any
     Contract, Law, Order, or Permit.
 
          "Contract" shall mean any written or oral agreement, arrangement,
     authorization, commitment, contract, indenture, instrument, lease,
     obligation, plan, practice, restriction, understanding, or undertaking of
     any kind or character, or other document to which any Person is a party or
     that is binding on any Person or its capital stock, Assets or business.
 
          "Default" shall mean (i) any breach or violation of, default under,
     contravention of, or conflict with, any Contract, Law, Order, or Permit,
     (ii) any occurrence of any event that with the passage of time or the
     giving of notice or both would constitute a breach or violation of, default
     under, contravention of, or conflict with, any Contract, Law, Order, or
     Permit, or (iii) any occurrence of any event that with or without the
     passage of time or the giving of notice would give rise to a right of any
     Person to exercise any remedy or obtain any relief under, terminate or
     revoke, suspend, cancel, or modify or change the current terms of, or
     renegotiate, or to accelerate the maturity or performance of, or to
     increase or impose any Liability under, any Contract, Law, Order, or
     Permit.
 
          "Environmental Laws" shall mean all Laws relating to pollution or
     protection of human health or the environment (including ambient air,
     surface water, ground water, land surface, or subsurface strata) and which
     are administered, interpreted, or enforced by the United States
     Environmental Protection Agency and state and local agencies with
     jurisdiction over, and including common law in respect of, pollution or
     protection of the environment, including the Comprehensive Environmental
     Response Compensation and Liability Act, as amended, 42 U.S.C. 9601 et seq.
     ("CERCLA"), the Resource Conservation and Recovery Act, as amended, 42
     U.S.C. 6901 et seq. ("RCRA"), and other Laws relating to emissions,
     discharges, releases, or threatened releases of any Hazardous Material, or
     otherwise relating to the manufacture, processing, distribution, use,
     treatment, storage, disposal, transport, or handling of any Hazardous
     Material.
 
          "Equity Rights" shall mean all arrangements, calls, commitments,
     Contracts, options, rights to subscribe to, scrip, understandings,
     warrants, or other binding obligations of any character whatsoever relating
     to, or securities or rights convertible into or exchangeable for, shares of
     the capital stock of a Person or by which a Person is or may be bound to
     issue additional shares of its capital stock or other Equity Rights.
 
          "ERISA" shall mean the Employee Retirement Income Security Act of
     1974, as amended.
 
          "Exhibits" 1 through 6, inclusive, shall mean the Exhibits so marked,
     copies of which are attached to this Agreement. Such Exhibits are hereby
     incorporated by reference herein and made a part hereof, and may be
     referred to in this Agreement and any other related instrument or document
     without being attached hereto.
 
          "FHLMC" shall mean the Federal Home Loan Mortgage Corporation
 
          "FNMA" shall mean the Federal National Mortgage Association.
 
          "FBCA" shall mean the Florida Business Corporation Act.
 
          "First National" shall mean First National Bank & Trust Company of the
     Treasure Coast, a national banking association and a Seacoast Subsidiary.
 
          "GAAP" shall mean generally accepted accounting principles,
     consistently applied during the periods involved.
 
          "Hazardous Material" shall mean (i) any hazardous substance, hazardous
     material, hazardous waste, regulated substance, or toxic substance (as
     those terms are defined by any applicable Environmental Laws) and (ii) any
     chemicals, pollutants, contaminants, petroleum, petroleum products, or oil
     (and
 
                                      A-39
<PAGE>   118
 
     specifically shall include asbestos requiring abatement, removal, or
     encapsulation pursuant to the requirements of governmental authorities and
     any polychlorinated biphenyls).
 
          "HOLA" shall mean the Home Owners' Loan Act of 1933, as amended.
 
          "HSR Act" shall mean Section 7A of the Clayton Act, as added by Title
     II of the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended,
     and the rules and regulations promulgated thereunder.
 
          "Intellectual Property" shall mean copyrights, patents, trademarks,
     service marks, service names, trade names, applications therefor,
     technology rights and licenses, computer software (including any source or
     object codes therefor or documentation relating thereto), trade secrets,
     franchises, know-how, inventions, and other intellectual property rights.
 
          "Internal Revenue Code" shall mean the Internal Revenue Code of 1986,
     as amended, and the rules and regulations promulgated thereunder.
 
          "Joint Proxy Statement" shall mean the proxy statement used by PSHC
     and Seacoast to solicit the approval of their respective shareholders of
     the transactions contemplated by this Agreement, which shall include the
     prospectus of Seacoast relating to the issuance of the Seacoast Common
     Stock to holders of PSHC Common Stock.
 
          "Knowledge" as used with respect to a Person (including references to
     such Person being aware of a particular matter) shall mean those facts that
     are known or should reasonably have been known after due inquiry by the
     chairman, president, chief financial officer, chief accounting officer,
     chief operating officer, chief credit officer, general counsel, any
     assistant or deputy general counsel, or any senior, executive or other vice
     president of such Person and the knowledge of any such persons obtained or
     which would have been obtained from a reasonable investigation.
 
          "Law" shall mean any code, law (including common law), ordinance,
     regulation, reporting or licensing requirement, rule, or statute applicable
     to a Person or its Assets, Liabilities, or business, including those
     promulgated, interpreted or enforced by any Regulatory Authority.
 
          "Liability" shall mean any direct or indirect, primary or secondary,
     liability, indebtedness, obligation, penalty, cost or expense (including
     costs of investigation, collection and defense), claim, deficiency,
     guaranty or endorsement of or by any Person (other than endorsements of
     notes, bills, checks, and drafts presented for collection or deposit in the
     ordinary course of business) of any type, whether accrued, absolute or
     contingent, liquidated or unliquidated, matured or unmatured, or otherwise.
 
          "Lien" shall mean any conditional sale agreement, default of title,
     easement, encroachment, encumbrance, hypothecation, infringement, lien,
     mortgage, pledge, reservation, restriction, security interest, title
     retention or other security arrangement, or any adverse right or interest,
     charge, or claim of any nature whatsoever of, on, or with respect to any
     property or property interest, other than (i) Liens for current property
     Taxes not yet due and payable, (ii) for depository institution Subsidiaries
     of a Party, pledges to secure deposits and other Liens incurred in the
     ordinary course of the banking business, (iii) Liens which do not
     materially impair the use of or title to the Assets subject to such Lien,
     and which are disclosed in Section 11.1 of the PSHC Disclosure Memorandum
     or Seacoast Disclosure Memorandum, as applicable.
 
          "Litigation" shall mean any action, arbitration, cause of action,
     claim, complaint, criminal prosecution, governmental or other examination
     or investigation, hearing, administrative or other proceeding relating to
     or affecting a Party, its business, its Assets (including Contracts related
     to it), or the transactions contemplated by this Agreement, but shall not
     include regular, periodic examinations of depository institutions and their
     Affiliates by Regulatory Authorities.
 
          "Material" for purposes of this Agreement shall be determined in light
     of the facts and circumstances of the matter in question; provided that any
     specific monetary amount stated in this Agreement shall determine
     materiality in that instance.
 
                                      A-40
<PAGE>   119
 
          "NASD" shall mean the National Association of Securities Dealers, Inc.
 
          "Nasdaq National Market" shall mean the National Market System of the
     National Association of Securities Dealers Automated Quotations System.
 
          "Operating Property" shall mean any property owned, leased, or
     operated by the Party in question or by any of its Subsidiaries or in which
     such Party or Subsidiary holds a security interest or other interest
     (including an interest in a fiduciary capacity), and, where required by the
     context, includes the owner or operator of such property, but only with
     respect to such property.
 
          "Order" shall mean any administrative decision or award, decree,
     injunction, judgment, order, quasi-judicial decision or award, ruling, or
     writ of any federal, state, local or foreign or other court, arbitrator,
     mediator, tribunal, administrative agency, or Regulatory Authority.
 
          "Participation Facility" shall mean any facility or property in which
     the Party in question or any of its Subsidiaries participates in the
     management and, where required by the context, said term means the owner or
     operator of such facility or property, but only with respect to such
     facility or property.
 
          "Party" shall mean either PSHC or Seacoast, and "Parties" shall mean
     both PSHC and Seacoast.
 
          "Permit" shall mean any federal, state, local, and foreign
     governmental approval, authorization, certificate, easement, filing,
     franchise, license, notice, permit, or right to which any Person is a party
     or that is or may be binding upon or inure to the benefit of any Person or
     its securities, Assets, or business.
 
          "Person" shall mean a natural person or any legal, commercial or
     governmental entity, such as, but not limited to, a corporation, general
     partnership, joint venture, limited partnership, limited liability company,
     trust, business association, group acting in concert, or any person acting
     in a representative capacity.
 
          "PSHC Common Stock" shall mean the $0.01 par value common stock of
     PSHC.
 
          "PSHC Disclosure Memorandum" shall mean the written information
     entitled "Port St. Lucie National Bank Holding Corp. Disclosure Memorandum"
     delivered prior to the date of this Agreement to Seacoast describing in
     reasonable detail the matters contained therein and, with respect to each
     disclosure made therein, specifically referencing each Section of this
     Agreement under which such disclosure is being made. Information disclosed
     with respect to one Section shall not be deemed to be disclosed for
     purposes of any other Section not specifically referenced with respect
     thereto.
 
          "PSHC Entities" shall mean, collectively, PSHC and all PSHC
     Subsidiaries.
 
          "PSHC Financial Statements" shall mean (i) the consolidated statements
     of condition (including related notes and schedules, if any) of PSHC as of
     September 30, 1996, and as of December 31,1995 and 1994, and the related
     statements of income, changes in shareholders' equity, and cash flows
     (including related notes and schedules, if any) for the nine months ended
     September 30, 1996, and for each of the three fiscal years ended December
     31,1995, 1994 and 1993, as filed by PSHC in SEC Documents, and (ii) the
     consolidated statements of condition of PSHC (including related notes and
     schedules, if any) and related statements of income, changes in
     shareholders' equity, and cash flows (including related notes and
     schedules, if any) included in SEC Documents filed with respect to periods
     ended subsequent to September 30, 1996.
 
          "PSHC Material Adverse Effect" shall mean an event, change or
     occurrence which, individually or together with any other event, change or
     occurrence, has a material adverse impact on (i) the financial position,
     business, or results of operations of PSHC and its Subsidiaries, taken as a
     whole, or (ii) the ability of PSHC to perform its obligations under this
     Agreement or to consummate the Merger or the other transactions
     contemplated by this Agreement, provided that "Material Adverse Effect"
     shall not be deemed to include the impact of (a) changes in banking and
     similar Laws of general applicability or interpretations thereof by courts
     or governmental authorities, (b) changes in generally accepted accounting
     principles or regulatory accounting principles generally applicable to
     banks and their holding companies, (c) actions and omissions of PSHC (or
     any of its Subsidiaries) taken with the prior informed
 
                                      A-41
<PAGE>   120
 
     written Consent of Seacoast in contemplation of the transactions
     contemplated hereby, and (d) the direct effects of compliance with this
     Agreement on the operating performance of PSHC, including expenses incurred
     by PSHC in consummating the transactions contemplated by this Agreement.
 
          "PSHC Stock Plans" shall mean the existing stock option, stock
     purchase and other stock-based plans of PSHC.
 
          "PSHC Subsidiaries" shall mean the Subsidiaries of PSHC, which shall
     include the PSHC Subsidiaries described in Section 5.4 and any corporation,
     bank, savings association, or other organization acquired as a Subsidiary
     of PSHC in the future and held as a Subsidiary by PSHC at the Effective
     Time.
 
          "PSN Bank" shall mean Port St. Lucie National Bank, a national banking
     association and a PSHC Subsidiary.
 
          "Purchase Price Per Share" shall mean (i) the sum of (x) the average
     of the closing prices on the Nasdaq National Market as reported by The Wall
     Street Journal of Seacoast Common Stock for the 20 trading days preceding
     the fifth trading day preceding the Closing Date (the "Seacoast Stock
     Price") multiplied by 900,000 and (y) 1,242,953 (ii) divided by the number
     of shares of PSHC Common Stock plus the number of shares of PSHC Common
     Stock subject to PSHC Options, including PSHC Warrants, outstanding at the
     Effective Time.
 
          "Registration Statement" shall mean the Registration Statement on Form
     S-4, or other appropriate form, including any pre-effective or
     post-effective amendments or supplements thereto, filed with the SEC by
     Seacoast under the 1933 Act with respect to the shares of Seacoast Common
     Stock to be issued to the shareholders of PSHC in connection with the
     transactions contemplated by this Agreement.
 
          "Regulatory Authorities" shall mean, collectively, the SEC, the NASD,
     the Federal Trade Commission, the United States Department of Justice, the
     Board of the Governors of the Federal Reserve System, the Office of the
     Comptroller of the Currency, the Federal Deposit Insurance Corporation, and
     all other federal, state, county, local or other governmental or regulatory
     agencies, authorities (including self-regulatory authorities),
     instrumentalities, commissions, boards or bodies having jurisdiction over
     the Parties and their respective Subsidiaries.
 
          "Representative" shall mean any investment banker, financial advisor,
     attorney, accountant, consultant, or other representative engaged by a
     Person.
 
          "Seacoast Capital Stock" shall mean, collectively, the Seacoast Common
     Stock, the Seacoast Preferred Stock and any other class or series of
     capital stock of Seacoast.
 
          "Seacoast Common Stock" shall mean the $0.10 par value Class A common
     stock of Seacoast.
 
          "Seacoast Disclosure Memorandum" shall mean the written information
     entitled "Seacoast Banking Corporation of Florida Disclosure Memorandum"
     delivered prior to the date of this Agreement to PSHC describing in
     reasonable detail the matters contained therein and, with respect to each
     disclosure made therein, specifically referencing each Section of this
     Agreement under which such disclosure is being made. Information disclosed
     with respect to one Section shall not be deemed to be disclosed for
     purposes of any other Section not specifically referenced with respect
     thereto.
 
          "Seacoast Entities" shall mean, collectively, Seacoast and all
     Seacoast Subsidiaries.
 
          "Seacoast Financial Statements" shall mean (i) the consolidated
     statements of condition (including related notes and schedules, if any) of
     Seacoast as of September 30, 1996, and as of December 31, 1995 and 1994,
     and the related statements of income, changes in shareholders' equity, and
     cash flows (including related notes and schedules, if any) for the nine
     months ended September 30, 1996, and for each of the three fiscal years
     ended December 31, 1995, 1994 and 1993, as filed by Seacoast in SEC
     Documents, and (ii) the consolidated statements of condition and balance
     sheets of Seacoast (including related notes and schedules, if any) and
     related statements of income, changes in shareholders' equity, and cash
     flows (including related notes and schedules, if any) included in SEC
     Documents filed with respect to periods ended subsequent to September 30,
     1996.
 
                                      A-42
<PAGE>   121
 
          "Seacoast Material Adverse Effect" shall mean an event, change or
     occurrence which, individually or together with any other event, change or
     occurrence, has a material adverse impact on (i) the financial position,
     business, or results of operations of Seacoast and its Subsidiaries, taken
     as a whole, or (ii) the ability of Seacoast to perform its obligations
     under this Agreement or to consummate the Merger or the other transactions
     contemplated by this Agreement, provided that "Material Adverse Effect"
     shall not be deemed to include the impact of (a) changes in banking and
     similar Laws of general applicability or interpretations thereof by courts
     or governmental authorities, (b) changes in generally accepted accounting
     principles or regulatory accounting principles generally applicable to
     banks and their holding companies, (c) actions and omissions of Seacoast
     (or any of its Subsidiaries) taken with the prior informed written Consent
     of PSHC in contemplation of the transactions contemplated hereby, and (d)
     the direct effects of compliance with this Agreement on the operating
     performance of Seacoast, including expenses incurred by Seacoast in
     consummating the transactions contemplated by this Agreement.
 
          "Seacoast Preferred Stock" shall mean the $1.00 par value preferred
     stock of Seacoast.
 
          "Seacoast Stock Plans" shall mean the existing stock option and other
     stock-based compensation plans of Seacoast designated as follows: (i)
     Seacoast Banking Corporation of Florida 1991 Stock Option and Stock
     Appreciation Rights Plan and (ii) Seacoast Banking Corporation of Florida
     1996 Long-term Incentive Plan.
 
          "Seacoast Stock Price" shall mean the average of the closing prices on
     the Nasdaq National Market as reported by The Wall Street Journal of
     Seacoast Common Stock for the 20 trading days preceding the fifth trading
     day preceding the Closing Date.
 
          "Seacoast Subsidiaries" shall mean the Subsidiaries of Seacoast, which
     shall include the Seacoast Subsidiaries described in Section 6.4 and any
     corporation, bank, savings association, or other organization acquired as a
     Subsidiary of Seacoast in the future and held as a Subsidiary by Seacoast
     at the Effective Time.
 
          "SEC Documents" shall mean all forms, proxy statements, registration
     statements, reports, schedules, and other documents filed, or required to
     be filed, by a Party or any of its Subsidiaries with any Regulatory
     Authority pursuant to the Securities Laws.
 
          "Securities Laws" shall mean the 1933 Act, the 1934 Act, the
     Investment Company Act of 1940, as amended, the Investment Advisors Act of
     1940, as amended, the Trust Indenture Act of 1939, as amended, and the
     rules and regulations of any Regulatory Authority promulgated thereunder.
 
          "Shareholders' Meetings" shall mean the respective meetings of the
     shareholders of PSHC and Seacoast to be held pursuant to Section 8.1,
     including any adjournment or adjournments thereof.
 
          "Significant Subsidiary" shall mean any present or future consolidated
     Subsidiary of the Party in question, the assets of which constitute ten
     percent (10%) or more of the consolidated assets of such Party as reflected
     on such Party's consolidated statement of condition prepared in accordance
     with GAAP.
 
          "Subsidiaries" shall mean all those corporations, associations, or
     other business entities of which the entity in question either (i) owns or
     controls 50% or more of the outstanding equity securities either directly
     or through an unbroken chain of entities as to each of which 50% or more of
     the outstanding equity securities is owned directly or indirectly by its
     parent (provided, there shall not be included any such entity the equity
     securities of which are owned or controlled in a fiduciary capacity), (ii)
     in the case of partnerships, serves as a general partner, (iii) in the case
     of a limited liability company, serves as a managing member, or (iv)
     otherwise has the ability to elect a majority of the directors, trustees or
     managing members thereof.
 
          "Surviving Corporation" shall mean Seacoast as the surviving 
     corporation resulting from the Merger.
 
                                      A-43
<PAGE>   122
 
          "Tax Return" shall mean any report, return, information return, or
     other information required to be supplied to a taxing authority in
     connection with Taxes, including any return of an affiliated or combined or
     unitary group that includes a Party or its Subsidiaries.
 
          "Tax" or "Taxes" shall mean any federal, state, county, local, or
     foreign taxes, charges, fees, levies, imposts, duties, or other
     assessments, including income, gross receipts, excise, employment, sales,
     use, transfer, license, payroll, franchise, severance, stamp, occupation,
     windfall profits, environmental, federal highway use, commercial rent,
     customs duties, capital stock, paid-up capital, profits, withholding,
     Social Security, single business and unemployment, disability, real
     property, personal property, registration, ad valorem, value added,
     alternative or add-on minimum, estimated, or other tax or governmental fee
     of any kind whatsoever, imposes or required to be withheld by the United
     States or any state, county, local or foreign government or subdivision or
     agency thereof, including any interest, penalties, and additions imposed
     thereon or with respect thereto.
 
     (b) The terms set forth below shall have the meanings ascribed thereto in
the referenced sections:
 
<TABLE>
<S>                                                           <C>
Allowance...................................................  Section 5.9
Bank Merger.................................................  Section 1.4
Bank Plan...................................................  Section 1.4
Closing.....................................................  Section 1.2
Counties....................................................  Section 7.1.
Effective Time..............................................  Section 1.3
ERISA Affiliate.............................................  Section 5.15(b)
Exchange Agent..............................................  Section 4.1
Exchange Ratio..............................................  Section 3.1(b)
Lower Threshold Price.......................................  Section 3.1(b)
Maximum Amount..............................................  Section 8.15
Merger......................................................  Section 1.1
PSHC Benefit Plans..........................................  Section 5.15
PSHC Contracts..............................................  Section 5.16
PSHC ERISA Plan.............................................  Section 5.15
PSHC Options................................................  Section 3.6
PSHC Pension Plan...........................................  Section 5.15
PSHC SEC Reports............................................  Section 5.5(a)
Seacoast Benefit Plans......................................  Section 6.15
Seacoast Contracts..........................................  Section 6.16
Seacoast ERISA Plan.........................................  Section 6.15
Seacoast Pension Plan.......................................  Section 6.15
Seacoast SEC Reports........................................  Section 6.5(a)
Takeover Laws...............................................  Section 5.21
Tax Opinion.................................................  Section 9.1(h)
Wholesale Mortgage Business.................................  Section 5.16
</TABLE>
 
     (c) Any singular term in this Agreement shall be deemed to include the
plural, and any plural term the singular. Whenever the words "include,"
"includes" or "including" are used in this Agreement, they shall be deemed
followed by the words "without limitation."
 
     11.2 Expenses.  Except as otherwise provided in this Section 11.2, each of
the Parties shall bear and pay all direct costs and expenses incurred by it or
on its behalf in connection with the transactions contemplated hereunder,
including filing, registration and application fees, printing fees, and fees and
expenses of its own financial or other consultants, investment bankers,
accountants, and counsel, except that each of the Parties shall bear and pay
one-half of the filing fees payable in connection with the Registration
Statement and the Joint Proxy Statement and printing costs incurred in
connection with the printing of the Registration Statement and the Joint Proxy
Statement.
 
                                      A-44
<PAGE>   123
 
     11.3 Brokers and Finders.  Except for Austin Associates, Inc. as to PSHC
and except for The Robinson-Humphrey Company as to Seacoast, each of the Parties
represents and warrants that neither it nor any of its officers, directors,
employees, or Affiliates has employed any broker or finder or incurred any
Liability for any financial advisory fees, investment bankers' fees, brokerage
fees, commissions, or finders' fees in connection with this Agreement or the
transactions contemplated hereby. In the event of a claim by any broker or
finder based upon his or its representing or being retained by or allegedly
representing or being retained by PSHC or by Seacoast, each of PSHC and
Seacoast, as the case may be, agrees to indemnify and hold the other Party
harmless of and from any Liability in respect of any such claim.
 
     11.4 Entire Agreement.  Except as otherwise expressly provided herein, this
Agreement (including the documents and instruments referred to herein)
constitutes the entire agreement between the Parties with respect to the
transactions contemplated hereunder and supersedes all prior arrangements or
understandings with respect thereto, written or oral (except, as to Section
8.6(b), for the Confidentiality Agreement). Nothing in this Agreement expressed
or implied, is intended to confer upon any Person, other than the Parties or
their respective successors, any rights, remedies, obligations, or liabilities
under or by reason of this Agreement, other than as provided in Sections 8.14
and 8.15.
 
     11.5 Amendments.  To the extent permitted by Law, this Agreement may be
amended by a subsequent writing signed by each of the Parties upon the approval
of each of the Parties, whether before or after shareholder approval of this
Agreement has been obtained; provided, that after any such approval by the
holders of PSHC Common Stock, there shall be made no amendment that reduces or
modifies in any material respect the consideration to be received by holders of
PSHC Common Stock; and further provided, that after any such approval by the
holders of Seacoast Common Stock, the provisions of this Agreement relating to
the manner or basis in which shares of PSHC Common Stock will be exchanged for
shares of Seacoast Common Stock shall not be amended after the Shareholders'
Meetings in a manner adverse to the holders of Seacoast Common Stock without any
requisite approval of the holders of the issued and outstanding shares of
Seacoast Common Stock entitled to vote thereon.
 
     11.6 Waivers.  (a) Prior to or at the Effective Time, Seacoast, acting
through its Board of Directors, chief executive officer or other authorized
officer, shall have the right to waive any Default in the performance of any
term of this Agreement by PSHC, to waive or extend the time for the compliance
or fulfillment by PSHC of any and all of its obligations under this Agreement,
and to waive any or all of the conditions precedent to the obligations of
Seacoast under this Agreement, except any condition which, if not satisfied,
would result in the violation of any Law. No such waiver shall be effective
unless in writing signed by a duly authorized officer of Seacoast.
 
     (b) Prior to or at the Effective Time, PSHC, acting through its Board of
Directors, chief executive officer or other authorized officer, shall have the
right to waive any Default in the performance of any term of this Agreement by
Seacoast, to waive or extend the time for the compliance or fulfillment by
Seacoast of any and all of its obligations under this Agreement, and to waive
any or all of the conditions precedent to the obligations of PSHC under this
Agreement, except any condition which, if not satisfied, would result in the
violation of any Law. No such waiver shall be effective unless in writing signed
by a duly authorized officer of PSHC.
 
     (c) The failure of any Party at any time or times to require performance of
any provision hereof shall in no manner affect the right of such Party at a
later time to enforce the same or any other provision of this Agreement. No
waiver of any condition or of the breach of any term contained in this Agreement
in one or more instances shall be deemed to be or construed as a further or
continuing waiver of such condition or breach or a waiver of any other condition
or of the breach of any other term of this Agreement.
 
     11.7 Assignment.  Except as expressly contemplated hereby, neither this
Agreement nor any of the rights, interests or obligations hereunder shall be
assigned by any Party hereto (whether by operation of Law or otherwise) without
the prior written consent of the other Party. Subject to the preceding sentence,
this Agreement will be binding upon, inure to the benefit of and be enforceable
by the Parties and their respective successors and assigns.
 
                                      A-45
<PAGE>   124
 
     11.8 Notices.  All notices or other communications which are required or
permitted hereunder shall be in writing and sufficient if delivered by hand, by
facsimile transmission, by registered or certified mail, postage pre-paid, or by
courier or overnight carrier, to the persons at the addresses set forth below
(or at such other address as may be provided hereunder), and shall be deemed to
have been delivered as of the date so delivered:
 
<TABLE>
<S>                                         <C>
PSHC:                                       Port St. Lucie National Bank Holding Corp.
                                            1100 S.W. St. Lucie West Boulevard
                                            Port St. Lucie, Florida 34986
                                            Telecopy Number: (561) 878-5431
                                            Attention: J. Hal Roberts, Jr.
Copy to Counsel:                            Gunster, Yoakley, Valdes-Fauli & Stewart, P.A.
                                            777 South Flagler Drive
                                            Suite 500 East
                                            West Palm Beach, Florida 33401-6194
                                            Telecopy Number: (561) 655-5677
                                            Attention: Michael V. Mitrione, Esq.
Seacoast:                                   Seacoast Banking Corporation of Florida
                                            815 Colorado Avenue
                                            P.O. Box 9012
                                            Stuart, Florida 34995-9012
                                            Telecopy Number: (561) 288-6012
                                            Attention: Mr. Dennis S. Hudson, III
Copy to Counsel:                            Alston & Bird
                                            One Atlantic Center
                                            1201 West Peachtree Street
                                            Atlanta, Georgia 30327
                                            Telecopy Number: (404) 881-7777
                                            Attention: Ralph F. MacDonald, III, Esq.
</TABLE>
 
     11.9 Governing Law.  This Agreement shall be governed by and construed in
accordance with the Laws of the State of Florida, without regard to any
applicable conflicts of Laws.
 
     11.10 Counterparts.  This Agreement may be executed in two or more
counterparts, each of which shall be deemed to be an original, but all of which
together shall constitute one and the same instrument.
 
     11.11 Captions; Articles and Sections.  The captions contained in this
Agreement are for reference purposes only and are not part of this Agreement.
Unless otherwise indicated, all references to particular Articles or Sections
shall mean and refer to the referenced Articles and Sections of this Agreement.
 
     11.12 Interpretations.  Neither this Agreement nor any uncertainty or
ambiguity herein shall be construed or resolved against any party, whether under
any rule of construction or otherwise. No party to this Agreement shall be
considered the draftsman. The parties acknowledge and agree that this Agreement
has been reviewed, negotiated, and accepted by all parties and their attorneys
and shall be construed and interpreted according to the ordinary meaning of the
words used so as fairly to accomplish the purposes and intentions of all parties
hereto.
 
     11.13 Enforcement of Agreement.  The Parties hereto agree that irreparable
damage would occur in the event that any of the provisions of this Agreement was
not performed in accordance with its specific terms or was otherwise breached.
It is accordingly agreed that the Parties shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement and to enforce specifically
the terms and provisions hereof in any court of the United States or any state
having jurisdiction, this being in addition to any other remedy to which they
are entitled at law or in equity.
 
                                      A-46
<PAGE>   125
 
     11.14 Severability.  Any term or provision of this Agreement which is
invalid or unenforceable in any jurisdiction shall, as to that jurisdiction, be
ineffective to the extent of such invalidity or unenforceability without
rendering invalid or unenforceable the remaining terms and provisions of this
Agreement or affecting the validity or enforceability of any of the terms or
provisions of this Agreement in any other jurisdiction. If any provision of this
Agreement is so broad as to be unenforceable, the provision shall be interpreted
to be only so broad as is enforceable.
 
     IN WITNESS WHEREOF, each of the Parties has caused this Agreement to be
executed on its behalf by its duly authorized officers as of the day and year
first above written.
 
                                          SEACOAST BANKING CORPORATION OF
                                          FLORIDA
 
                                          By:
                                            ------------------------------------
   
                                                  Executive Vice President
    
 
                                          PORT ST. LUCIE NATIONAL BANK HOLDING
                                          CORP.
 
                                          By:     /s/ J. HAL ROBERTS, JR.
                                            ------------------------------------
                                                    J. Hal Roberts, Jr.
                                                         President
 
                                      A-47
<PAGE>   126
 
                                                          EXHIBIT 1 TO AGREEMENT
                                                              AND PLAN OF MERGER
 
                                 PLAN OF MERGER
                                       OF
                          PORT ST. LUCIE NATIONAL BANK
                                 WITH AND INTO
           FIRST NATIONAL BANK & TRUST COMPANY OF THE TREASURE COAST
 
     This Plan of Merger ("Plan of Merger") is made and entered into as of
February 19, 1997, by and between PORT ST. LUCIE NATIONAL BANK, a national
banking association organized and existing under the laws of the United States
with its main office located in Port St. Lucie, Florida ("PSNB"), and FIRST
NATIONAL BANK & TRUST COMPANY OF THE TREASURE COAST, a national banking
association organized and existing under the laws of the United States with its
main office located in Stuart, Florida ("FNB").
 
     FNB is a wholly-owned subsidiary of Seacoast Banking Corporation of
Florida, a corporation organized and existing under the laws of the State of
Florida, with its principal office located in Stuart, Florida ("Seacoast"). PSNB
is a wholly-owned subsidiary of Port St. Lucie National Bank Holding
Corporation, a corporation organized and existing under the laws of the State of
Florida, with its principal office in Port St. Lucie, Florida ("PSHC"). Prior to
the execution and delivery of this Plan of Merger, Seacoast and PSHC have
entered into a Agreement and Plan of Merger (the "Parent Agreement") pursuant to
which PSHC would merge with and into Seacoast. The Parent Agreement also
contemplates that PSNB will be merged with and into FNB. The Boards of Directors
of PSNB and FNB are of the opinion that the bests interests of their respective
banks would be served if PSNB is merged with and into FNB on the terms and
conditions provided in this Plan of Merger.
 
     NOW, THEREFORE, in consideration of the covenants and agreements contained
herein, PSNB and FNB hereby make, adopt and approve this Plan of Merger in order
to set forth the terms and conditions for the merger of PSNB into FNB.
 
                                  ARTICLE ONE
 
                                  DEFINITIONS
 
     Except as otherwise provided herein, the capitalized terms set forth below
shall have the following meanings:
 
          1.1 "PSNB Common Stock" shall mean the $5.00 par value common stock of
     PSNB.
 
          1.2 "Bank Merger" shall refer to the merger of PSNB with and into FNB
     as provided in Section 2.1 of this Plan of Merger.
 
          1.3 "FNB Common Stock" shall mean the $10.00 par value common stock of
     FNB.
 
          1.4 "Certificate of Merger" shall mean the Certificate of Merger to be
     issued by the Office of the Comptroller of the Currency of the United
     States approving the Bank Merger.
 
          1.5 "Effective Time" shall mean the date and time on which the Bank
     Merger becomes effective as specified in the Certificate of Merger.
 
                                  ARTICLE TWO
 
                              TERMS OF BANK MERGER
 
     2.1 Merger.  Subject to the terms and conditions set forth in this Plan of
Merger, at the Effective Time, PSNB shall be merged with and into FNB under the
Charter and Articles of Association of FNB pursuant to
 
                                      A-48
<PAGE>   127
 
the provisions of and with the effect provided in Title 12, United States Code,
Section 215a. FNB shall be the surviving bank and the receiving association
resulting from the Bank Merger and shall continue to conduct its business under
the name "FIRST NATIONAL BANK & TRUST COMPANY OF THE TREASURE COAST." The Bank
Merger shall be consummated pursuant to the terms of this Plan of Merger, which
has been approved and adopted by the respective Boards of Directors and
shareholders of FNB and PSNB.
 
     2.2 Method of Converting Shares.  All of the shares of FNB Common Stock
issued and outstanding at the Effective Time shall remain issued and outstanding
after the Effective Time and shall be unaffected by the Bank Merger. At the
Effective Time, the certificates representing all of the issued and outstanding
shares of PSNB Common Stock shall be surrendered to FNB for cancellation and no
consideration shall be issued in exchange therefor.
 
                                 ARTICLE THREE
 
                             EFFECT OF BANK MERGER
 
     3.1 Business of FNB.  The business of FNB from and after the Effective Time
shall continue to be that of a national banking association. The business shall
be conducted from its main office located in Stuart, Florida and at its legally
established branches, which shall also include the main office and all branches,
whether in operation or approved but unopened, of PSNB at the Effective Time.
 
     3.2 Assumption of Rights.  At the Effective Time, the separate existence
and corporate organization of PSNB shall be merged into and continued in FNB, as
the surviving bank and receiving association of the Bank Merger. All rights,
franchises and interests of PSNB and FNB in and to every type of property (real,
personal and mixed), and all choses in action of PSNB and FNB shall be
transferred to and vested in FNB as the surviving bank and receiving association
by virtue of the Bank Merger without any deed or other transfer. FNB, upon
consummation of the Bank Merger and without any order or other action on the
part of any court or otherwise, shall hold and enjoy all rights of property,
franchises and interests, including appointments, designations and nominations,
and all other rights and interests as trustee, executor, administrator,
registrar of stocks and bonds, guardian of estates, assignee, receiver and
committee of estates of lunatics, and in every other fiduciary capacity, in the
same manner and to the same extent as such rights, franchises, and interests
were held or enjoyed by either of PSNB or by FNB at the Effective Time, subject
to the conditions imposed by Title 12, United States Code, Section 215a.
 
     3.3 Assumption of Liabilities.  All liabilities and obligations of both of
PSNB and of FNB of every kind and description shall be assumed by FNB as the
surviving bank and receiving association by virtue of the Bank Merger, and FNB
shall be bound thereby in the same manner and to the same extent that either of
PSNB or FNB was so bound at the Effective Time.
 
     3.4 Articles of Association.  At the Effective Time, following consummation
of the Bank Merger, the Articles of Association of FNB shall be in the form set
forth in Annex A to this Plan of Merger, as modified only by such amendments as
may be adopted by the sole shareholder of FNB prior to the Effective Time. The
Bylaws of FNB shall be in the form set forth in Annex B to this Plan of Merger,
as modified only by such amendments as may be adopted by the sole shareholder of
FNB prior to the Effective Time.
 
     3.5 Officers, Employees and Directors.  The officers and employees of FNB
immediately following the Effective Time shall include, among others, the
officers and employees of FNB and PSNB immediately prior to the Effective Time.
The Board of Directors of FNB immediately following the Effective Time shall
consist of the persons named in Annex C to this Plan of Merger, including two
persons from FNB's Board of Directors, each of whom shall serve until his
respective successor is elected and qualified or until a new Board of Directors
is elected as provided in the Articles of Association or Bylaws of FNB or as
provided by law. All directors of PSNB as of the Closing who do not become
directors of FNB shall serve as members of FNB's St. Lucie Advisory Board, and
shall have such rights and powers as are set out in FNB's Bylaws, as amended
form time to time, and shall receive fees for their service on such advisory
board consistent with the fees paid by FNB to members of its other advisory
boards.
 
                                      A-49
<PAGE>   128
 
   
     3.6 Capital Stock of FNB.  The capital stock of FNB upon completion of the
Bank Merger shall be approximately $14.5 million, consisting of 2,000,000
authorized shares and 1,450,000 issued and outstanding shares of common stock of
a par value of $10 per share. In addition, FNB shall have a surplus of
approximately $18 million and undivided profits, including capital reserves, of
approximately $38 million adjusted, however, for earnings and expenses between
December 31, 1996 and the Effective Time.
    
 
                                  ARTICLE FOUR
 
                                 EFFECTIVENESS
 
     4.1 Conditions Precedent.  Consummation of the Bank Merger is conditioned
upon (i) the Closing of the transactions contemplated by the Parent Agreement
and (ii) receipt of all approvals, consents, waivers, and other clearances of
all federal and state regulatory authorities having jurisdiction over the
transactions contemplated by this Plan of Merger.
 
     4.2 Termination.  This Plan of Merger may be terminated at any time prior
to the Effective Time by the parties hereto after termination of the Parent
Agreement in accordance with the provisions of Section 10.1 thereof.
 
     4.3 Effectiveness.  Subject to the satisfaction of all requirements of
applicable laws and regulations and the terms and conditions set forth herein,
the Bank Merger contemplated by this Plan of Merger shall be and become
effective at the time and on the date specified in the Certificate of Merger.
 
                                  ARTICLE FIVE
 
                                REPRESENTATIONS
 
     5.1 Organization, Standing, and Power.  PSNB is a bank duly organized and
validly existing under the Laws of the State of Florida, and has the power and
authority to carry on its business as now conducted and to own, lease and
operate its Assets.
 
     5.2 Authority; No Breach By Agreement.  (a) PSNB has the corporate power
and authority necessary to execute, deliver, and perform its obligations under
this Bank Plan of Merger and to consummate the transactions contemplated hereby.
The execution, delivery, and performance of this Bank Plan of Merger and the
consummation of the transactions contemplated herein have been duly and validly
authorized by all necessary corporate action in respect thereof on the part of
PSNB. Subject to such requisite shareholder approval, this Agreement represents
a legal, valid, and binding obligation of PSNB, enforceable against PSNB in
accordance with its terms (except in all cases as such enforceability may be
limited by applicable, insolvency, reorganization, moratorium, or similar Laws
affecting the enforcement of creditors' rights generally and except that the
availability of the equitable remedy of specific performance or injunctive
relief is subject to the discretion of the court before which any proceeding may
be brought).
 
     (b) Neither the execution and delivery of this Bank Plan of Merger by PSNB,
nor the consummation by PSNB of the transactions contemplated hereby, nor
compliance by PSNB with any of the provisions hereof, will except as
specifically disclosed in the PSHC Disclosure Memorandum delivered pursuant to
the Parent Agreement (i) conflict with or result in a breach of any provision of
PSNB's Articles of Incorporation or Bylaws, (ii) constitute or result in a
Default under, or require any Consent pursuant to, or result in the creation of
any Lien on any Asset of any PSHC Company under, any Contract or Permit of any
PSHC Company, or (iii) subject to receipt of the requisite approvals referred to
in Section 4.1 of this Bank Plan of Merger, violate any Law or Order applicable
to any PSHC Company or any of their respective material Assets.
 
     (c) Other than in connection or compliance with the provisions of the
Securities Laws, applicable state corporate and securities Laws, and other than
Consents required from Regulatory Authorities, and other than notices to or
filings with the Internal Revenue Service or the Pension Benefit Guaranty
Corporation with respect to any employee benefit plans, or under, and other than
Consents, filings, or notifications which, if not
 
                                      A-50
<PAGE>   129
 
obtained or made, are not reasonably likely to have, individually or in the
aggregate, a Material Adverse Effect on PSNB, no notice to, filing with, or
Consent of, any public body or authority is necessary for the consummation by
PSNB of the Merger and the other transactions contemplated in this Bank Plan of
Merger.
 
     5.3 Capital Stock.  (a) The authorized capital stock of PSNB consists of
5,000,000 shares of PSNB Common Stock, of which 5,000,000 shares are issued and
outstanding as of the date of this Bank Plan of Merger and not more than
5,000,000 shares will be issued and outstanding at the Effective Time. All of
the issued and outstanding shares of capital stock of PSHC are duly and validly
issued and outstanding and are fully paid and nonassessable. None of the
outstanding shares of capital stock of PSNB has been issued in violation of any
preemptive rights of the current or past shareholders of PSNB.
 
     (b) Except as set forth in Section 5.3(a) hereof, there are no shares of
capital stock or other equity securities of PSNB outstanding and no outstanding
Rights relating to the capital stock of PSNB.
 
                                  ARTICLE SIX
 
                                 MISCELLANEOUS
 
     6.1 Amendment.  To the extent permitted by law, this Plan of Merger may be
amended by a subsequent written instrument upon the approval of the Boards of
Directors of each of the parties hereto and upon execution of such instrument by
the duly authorized officers of each and by a majority of the Boards of
Directors of PSNB and FNB; provided that no amendment to this Plan of Merger
shall modify the requirements of regulatory approval as set forth in Section 4.1
hereof.
 
     6.2 Governing Law.  This Plan of Merger shall be governed by and construed
in accordance with the laws of the State of Florida, except to the extent that
the federal laws of the United States of America apply to consummation of the
Bank Merger.
 
     6.3 Headings.  The headings in this Plan of Merger are for convenience only
and shall not affect the construction or interpretation of this Plan of Merger.
 
     6.4 Counterparts.  This Plan of Merger may be executed in two or more
counterparts, each of which shall be deemed an original instrument, but all of
which together shall constitute one and the same instrument.
 
     IN WITNESS WHEREOF, PSNB and FNB has caused this Plan of Merger to be
executed on its behalf by its officers thereunto duly authorized and by a
majority of its Board of Directors, all as of the day and year first above
written.
 
<TABLE>
<S>                                                    <C>
ATTEST:                                                FIRST NATIONAL BANK & TRUST COMPANY OF THE TREASURE
                                                       COAST
 
By:                                                    By:
- -----------------------------------------------------  -----------------------------------------------------
    Title:                                                 Title:
          
 
[BANK SEAL]
 
ATTEST:                                                PORT ST. LUCIE NATIONAL BANK
 
By:                                                    By:
- -----------------------------------------------------  -----------------------------------------------------
    Title:                                                 Title:
          
 
[BANK SEAL]
</TABLE>
 
                                      A-51
<PAGE>   130
 
                                                          EXHIBIT 2 TO AGREEMENT
                                                              AND PLAN OF MERGER
 
                          FORM OF AFFILIATE AGREEMENT
 
Seacoast Banking Corporation of Florida
P. O. Box 9012
Stuart, Florida 34995-9012
 
Attention: Dennis S. Hudson, III
           Executive Vice President
 
Gentlemen:
 
     The undersigned is a shareholder of Port St. Lucie National Bank Holding
Corp. ("PSHC"), a corporation organized and existing under the laws of the State
of Florida, and will become a shareholder of Seacoast Banking Corporation of
Florida ("Seacoast"), a corporation organized and existing under the laws of the
State of Florida, pursuant to the transactions described in the Agreement and
Plan of Merger, dated as of February 19, 1997 (the "Agreement"), by and between
Seacoast and PSHC. Under the terms of the Agreement, PSHC will be merged into
and with Seacoast (the "Merger"), and the shares of the $0.01 par value common
stock of PSHC ("PSHC Common Stock") will be converted into and exchanged for
shares of the $0.10 par value Class A common stock of Seacoast ("Seacoast Common
Stock"). This Affiliate Agreement represents an agreement between the
undersigned and Seacoast regarding certain rights and obligations of the
undersigned in connection with the shares of Seacoast to be received by the
undersigned as a result of the Merger.
 
     In consideration of the Merger and the mutual covenants contained herein,
and other good and valuable consideration, the receipt and sufficiency of which
are acknowledged, the undersigned and Seacoast hereby agree as follows:
 
          1. Affiliate Status.  The undersigned understands and agrees that as
     to PSHC he is an "affiliate" under Rule 145(c) as defined in Rule 405 of
     the Rules and Regulations of the Securities and Exchange Commission ("SEC")
     under the Securities Act of 1933, as amended ("1933 Act"), and the
     undersigned anticipates that he will be such an "affiliate" at the time of
     the Merger.
 
          2. Initial Restriction on Disposition.  The undersigned agrees that he
     will not sell, transfer, or otherwise dispose of his interests in, or
     reduce his risk relative to, any of the shares of Seacoast Common Stock
     into which his shares of PSHC Common Stock are converted upon consummation
     of the Merger until such time that the requirements of SEC Accounting
     Series Release Nos. 130 and 135 ("ASR 130 and 135") have been met. The
     undersigned understands that ASR 130 and 135 relate to publication of
     financial results of post-Merger combined operations of Seacoast and PSHC.
     Seacoast agrees that it will publish such results within 45 days after the
     end of the first fiscal quarter of Seacoast containing the required period
     of post-Merger combined operations and that it will notify the undersigned
     promptly following such publication.
 
          3. Covenants and Warranties of Undersigned.  The undersigned
     represents, warrants and agrees that:
 
             (a) The Seacoast Common Stock received by the undersigned as a
        result of the Merger will be taken for his own account and not for
        others, directly or indirectly, in whole or in part.
 
             (b) Seacoast has informed the undersigned that any distribution by
        the undersigned of Seacoast Common Stock has not been registered under
        the 1933 Act and that shares of Seacoast Common Stock received pursuant
        to the Merger can only be sold by the undersigned (1) following
        registration under the 1933 Act, or (2) in conformity with the volume
        and other requirements of Rule 145(d) promulgated by the SEC as the same
        now exist or may hereafter be amended, or (3) to
 
                                      A-52
<PAGE>   131
 
        the extent some other exemption from registration under the 1933 Act
        might be available. The undersigned understands that Seacoast is under
        no obligation to file a registration statement with the SEC covering the
        disposition of the undersigned's shares of Seacoast Common Stock or to
        take any other action necessary to make compliance with an exemption
        from such registration available.
 
             (c) The undersigned will, and will cause each of the other parties
        whose shares are deemed to be beneficially owned by the undersigned
        pursuant to Section 8 hereof to, have all shares of PSHC Common Stock
        beneficially owned by the undersigned registered in the name of the
        undersigned or in the name of any bank, broker-dealer, or clearinghouse
        or nominee of any such bank, broker-dealer or clearinghouse, subject in
        all cases to the restrictions contained herein and not for the purposes
        of, or in any manner otherwise, changing the beneficial ownership of
        such shares, reducing the undersigned's risk of ownership of such
        shares, or avoiding the purposes of this Agreement. The undersigned
        shall promptly notify any such bank, broker-dealer, clearinghouse or
        nominee of the restrictions imposed hereby by providing such persons a
        copy of this Agreement.
 
             (d) During the 30 days immediately preceding the Effective Time of
        the Merger, the undersigned has not sold, transferred, or otherwise
        disposed of his interests in, or reduced his risk relative to, any of
        the shares of PSHC Common Stock beneficially owned by the undersigned as
        of the record date for determination of shareholders entitled to vote at
        the Shareholders' Meeting of PSHC held to approve the Merger.
 
             (e) The undersigned is aware that Seacoast intends to treat the
        Merger as a tax-free reorganization under Section 368 of the Internal
        Revenue Code ("Code") for federal income tax purposes. The undersigned
        agrees to treat the transaction in the same manner as Seacoast for
        federal income tax purposes. The undersigned acknowledges that Section
        1.368-1(b) of the Income Tax Regulations requires "continuity of
        interest" in order for the Merger to be treated as tax-free under
        Section 368 of the Code. This requirement is satisfied if, taking into
        account those PSHC shareholders who receive cash in exchange for their
        stock, who receive cash in lieu of fractional shares, or who dissent
        from the Merger, there is no plan or intention on the part of the PSHC
        shareholders to sell or otherwise dispose of the Seacoast Common Stock
        to be received in the Merger that will reduce such shareholders'
        ownership to a number of shares having, in the aggregate, a value at the
        time of the merger of less than 50% of the total fair market value of
        the PSHC Common Stock outstanding immediately prior to the Merger. The
        undersigned has no prearrangement, plan or intention to sell or
        otherwise dispose of an amount of his Seacoast Common Stock to be
        received in the Merger which would cause the foregoing requirement not
        to be satisfied.
 
     4. Restrictions on Transfer.  The undersigned understands and agrees that
stop transfer instructions with respect to the shares of Seacoast Common Stock
received by the undersigned pursuant to the Merger will be given to Seacoast's
Transfer Agent and that there will be placed on the certificates for such
shares, or shares issued in substitution thereof, a legend stating in substance:
 
          "THE SHARES REPRESENTED BY THIS CERTIFICATE WERE ISSUED PURSUANT TO A
     BUSINESS COMBINATION WHICH IS ACCOUNTED FOR AS A "POOLING OF INTERESTS" AND
     MAY NOT BE SOLD, NOR MAY THE OWNER THEREOF REDUCE HIS RISKS RELATIVE
     THERETO IN ANY WAY, UNTIL SUCH TIME AS SEACOAST BANKING CORPORATION OF
     FLORIDA ("SEACOAST") HAS PUBLISHED THE FINANCIAL RESULTS COVERING AT LEAST
     30 DAYS OF COMBINED OPERATIONS AFTER THE EFFECTIVE DATE OF THE MERGER
     THROUGH WHICH THE BUSINESS COMBINATION WAS EFFECTED. IN ADDITION, THE
     SHARES REPRESENTED BY THIS CERTIFICATE MAY NOT BE SOLD, TRANSFERRED OR
     OTHERWISE DISPOSED OF EXCEPT OR UNLESS (1) COVERED BY AN EFFECTIVE
     REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933, AS AMENDED, (2) IN
     ACCORDANCE WITH (I) RULE 145(D) (IN THE CASE OF SHARES ISSUED TO AN
     INDIVIDUAL WHO IS NOT AN AFFILIATE OF SEACOAST) OR (II) RULE 144 (IN THE
     CASE OF SHARES ISSUED TO AN INDIVIDUAL WHO IS AN AFFILIATE OF SEACOAST) OF
     THE RULES AND REGULATIONS OF SUCH ACT, OR (3) IN ACCORDANCE
 
                                      A-53
<PAGE>   132
 
     WITH A LEGAL OPINION SATISFACTORY TO COUNSEL FOR SEACOAST THAT SUCH SALE OR
     TRANSFER IS OTHERWISE EXEMPT FROM THE REGISTRATION REQUIREMENTS OF SUCH
     ACT."
 
Such legend will also be placed on any certificate representing Seacoast
securities issued subsequent to the original issuance of the Seacoast Common
Stock pursuant to the Merger as a result of any transfer of such shares or any
stock dividend, stock split, or other recapitalization as long as the Seacoast
Common Stock issued to the undersigned pursuant to the Merger has not been
transferred in such manner to justify the removal of the legend therefrom. Upon
the request of the undersigned, Seacoast shall cause the certificates
representing the shares of Seacoast Common Stock issued to the undersigned in
connection with the Merger to be reissued free of any legend relating to
restrictions on transfer by virtue of ASR 130 and 135 as soon as practicable
after the requirements of ASR 130 and 135 have been met. In addition, if the
provisions of Rules 144 and 145 are amended to eliminate restrictions applicable
to the Seacoast Common Stock received by the undersigned pursuant to the Merger,
or at the expiration of the restrictive period set forth in Rule 145(d),
Seacoast, upon the request of the undersigned, will cause the certificates
representing the shares of Seacoast Common Stock issued to the undersigned in
connection with the Merger to be reissued free of any legend relating to the
restrictions set forth in Rules 144 and 145(d) upon receipt by Seacoast of an
opinion of its counsel to the effect that such legend may be removed.
 
     5. Understanding of Restrictions on Dispositions.  The undersigned has
carefully read the Agreement and this Affiliate Agreement and discussed their
requirements and effects upon his ability to sell, transfer, or otherwise
dispose of the shares of Seacoast Common Stock received by the undersigned, to
the extent he believes necessary, with his counsel or counsel for PSHC.
 
     6. Filing of Reports by Seacoast.  Seacoast agrees, for a period of three
years after the effective date of the Merger, to file on a timely basis all
reports required to be filed by it pursuant to Section 13 of the Securities
Exchange Act of 1934, as amended, so that the public information provisions of
Rule 145(d) promulgated by the SEC as the same are presently in effect will be
available to the undersigned in the event the undersigned desires to transfer
any shares of Seacoast Common Stock issued to the undersigned pursuant to the
Merger.
 
     7. Transfer Under Rule 145(d).  If the undersigned desires to sell or
otherwise transfer the shares of Seacoast Common Stock received by him in
connection with the Merger at any time during the restrictive period set forth
in Rule 145(d), the undersigned will provide the necessary representation letter
to the transfer agent for Seacoast Common Stock together with such additional
information as the transfer agent may reasonably request. If Seacoast's counsel
concludes that such proposed sale or transfer complies with the requirements of
Rule 145(d), Seacoast shall cause such counsel to provide such opinions as may
be necessary to Seacoast's Transfer Agent so that the undersigned may complete
the proposed sale or transfer.
 
     8. Acknowledgments and Further Agreements.  The undersigned recognizes and
agrees that the foregoing provisions also apply to all shares of the capital
stock of PSHC and Seacoast that are deemed to be beneficially owned by the
undersigned pursuant to applicable federal securities laws, which the
undersigned agrees may include, without limitation, shares owned or held in the
name of (i) the undersigned's spouse, (ii) any relative of the undersigned or of
the undersigned's spouse who has the same home as the undersigned, (iii) any
trust or estate in which the undersigned, the undersigned's spouse, and any such
relative collectively own at least a 10% beneficial interest or of which any of
the foregoing serves as trustee, executor, or in any similar capacity, and (iv)
any corporation or other organization in which the undersigned, the
undersigned's spouse and any such relative collectively own at least 10% of any
class of equity securities or of the equity interest. The undersigned further
recognizes that, in the event that the undersigned is a director or officer of
Seacoast or becomes a director or officer of Seacoast upon consummation of the
Merger, among other things, any sale of Seacoast Common Stock by the undersigned
within a period of less than six months following the effective time of the
Merger may subject the undersigned to liability pursuant to Section 16(b) of the
Securities Exchange Act of 1934, as amended.
 
     9. Miscellaneous.  This Affiliate Agreement is the complete agreement
between Seacoast and the undersigned concerning the subject matter hereof. Any
notice required to be sent to any party hereunder shall be sent by registered or
certified mail, return receipt requested, using the addresses set forth herein
or such
 
                                      A-54
<PAGE>   133
 
other address as shall be furnished in writing by the parties. This Affiliate
Agreement shall be governed by the laws of the State of Florida.
 
     This Affiliate Agreement is executed as of the 19th day of February, 1997.
 
                                          Very truly yours,
 
                                          --------------------------------------
                                          Signature
 
                                          --------------------------------------
                                          Print Name
 
                                          --------------------------------------
 
                                          --------------------------------------
 
                                          --------------------------------------
                                          Address
 
     [add below the signatures of all registered owners of shares deemed
beneficially owned by the affiliate]
 
                                          --------------------------------------
                                          Name:
 
                                          --------------------------------------
                                          Name:
 
                                          --------------------------------------
                                          Name:
 
                                          AGREED TO AND ACCEPTED as of
                                          February   , 1997
 
                                          SEACOAST BANKING CORPORATION OF
                                          FLORIDA
 
                                          By:
 
                                            ------------------------------------
 
                                      A-55
<PAGE>   134
 
                                                          EXHIBIT 4 TO AGREEMENT
                                                              AND PLAN OF MERGER
 
                          FORM OF DIRECTOR'S AGREEMENT
 
     THIS DIRECTOR'S AGREEMENT ("Agreement") is made and entered into as of the
19th day of February, 1997, by and between the undersigned,           , a
resident of           , Florida, and Seacoast Banking Corporation of Florida, a
corporation organized and existing under the laws of the State of Florida
("Seacoast").
 
     On even date herewith, Seacoast and Port St. Lucie National Bank Holding
Corp., a corporation organized and existing under the laws of the State of
Florida ("PSHC"), have entered into an Agreement and Plan of Merger (the "Merger
Agreement"). The Merger Agreement generally provides for the merger of PSHC with
and into Seacoast ("Merger"), and the conversion of the issued and outstanding
shares of the $0.01 par value common stock of PSHC ("PSHC Common Stock") into
shares of the $0.10 par value Class A common stock of Seacoast. The transactions
contemplated by the Merger Agreement are subject to the affirmative vote of the
shareholders of PSHC, the receipt of certain regulatory approvals and the
satisfaction of other conditions.
 
     The undersigned is a member of the Board of Directors of PSHC and is the
owner of        shares of PSHC Common Stock and has rights by option, warrants
and otherwise to acquire        additional shares of PSHC Common Stock
("Shares"). To induce Seacoast to enter into the Merger Agreement, the
undersigned is entering into this Agreement with Seacoast to set forth certain
terms and conditions governing the actions to be taken by the undersigned with
respect to the Shares until consummation of the Merger.
 
     NOW, THEREFORE, in consideration of the transactions contemplated by the
Merger Agreement and the mutual promises and covenants contained herein, and
other good and valuable consideration, the receipt and sufficiency of which are
acknowledged, the parties, intending to be legally bound, agree as follows:
 
          1. Without the prior written consent of Seacoast, the undersigned
     shall not transfer, sell, assign, convey or encumber any of the Shares
     during the term of this Agreement, except to Seacoast pursuant to the terms
     of the Merger Agreement. Without limiting the generality of the foregoing,
     the undersigned shall not grant to any party any option or right to
     purchase the Shares or any interest therein. Further, except with respect
     to the Merger, the undersigned shall not approve or ratify any agreement or
     contract pursuant to which the Shares would be transferred to any other
     party as a result of a consolidation, merger, reorganization or
     acquisition.
 
          2. The undersigned intends to, and will, vote all of the Shares
     beneficially owned by him (and with respect to which he has voting power)
     in favor of the Merger. The undersigned will also recommend that the
     shareholders of PSHC approve the Merger when the same is presented to the
     shareholders for consideration in properly prepared proxy materials,
     subject only to the undersigned's legal obligations (if any) as a director
     of PSHC, and will use his or her best efforts to effect consummation of the
     Merger and the other transactions contemplated by the Merger Agreement.
     Further, the undersigned intends to, and will, surrender the certificate or
     certificates representing his or her Shares which are beneficially owned by
     him (and with respect to which he has sole dispositive power) to Seacoast
     upon consummation of the Merger as described in the Merger Agreement.
 
          3. The undersigned covenants and agrees with Seacoast that for a
     period of two years after the effective time of the Merger, the undersigned
     shall not, without the prior written consent of Seacoast, directly or
     indirectly serve as a consultant to, serve as a management official of, or
     be or become a major shareholder of any Depository Institution having an
     office in Indian River, St. Lucie and/or Martin Counties, Florida. It is
     expressly understood that the covenants contained in this paragraph 3 do
     not apply to (i) "management official" positions which the undersigned
     holds with financial institutions other than PSHC as of the date of this
     Agreement, (ii) securities holdings which cause the undersigned to be
     deemed a major shareholder of a Depository Institution other than PSHC as
     of the date of this Agreement, or (iii) advisory relationships with a
     Depository Institution which the undersigned has as of
 
                                      A-56
<PAGE>   135
 
     the date of this Agreement or may have after the date hereof solely in the
     capacity as legal counsel. For the purposes of the covenants contained in
     this paragraph 3, the following terms shall have the following respective
     meanings:
 
             (a) The term "management official" shall refer to service of any
        type which gives the undersigned the authority to participate, directly
        or indirectly, in policy-making functions. This includes, but is not
        limited to, service as an organizer, officer, director, or advisory
        director of a Depository Institution. It is expressly understood and
        agreed that the undersigned may be deemed a management official of the
        Depository Institution whether or not he holds any official, elected, or
        appointed position with such Depository Institution.
 
             (b) The term "Depository Institution" shall refer to any person
        which engages in the business of making loans and taking deposits or
        which owns or controls, or is under common control with, a company which
        engages in such business.
 
             (c) The term "major shareholder" shall refer to the beneficial
        ownership of 2% or more of any class of voting securities of such
        company or the ownership of 2% of the total equity interest in such
        company, however denominated.
 
          4. The undersigned waives and releases any claims and/or rights he may
     have in or under the PSHC directors deferred compensation plan (the
     "Deferred Plan"), except for the delivery to the undersigned of any cash
     surrender value of any insurance policies held with respect to the
     undersigned's accrued benefits under the Deferred Plan, net of any
     cancellation, liquidation or surrender charges or fees.
 
          5. The undersigned acknowledges and agrees that Seacoast could not be
     made whole by monetary damages in the event of any default by the
     undersigned of the terms and conditions set forth in this Agreement. It is
     accordingly agreed and understood that Seacoast in addition to any other
     remedy which it may have at law or in equity, shall be entitled to an
     injunction, injunctions or a restraining order or orders to prevent
     breaches of this Agreement and specifically to enforce the terms and
     provisions hereof in any action instituted in any court of the United
     States or in any state having appropriate jurisdiction.
 
          6. Any term or provision of this Agreement which is invalid or
     unenforceable in any jurisdiction shall, as to that jurisdiction, be
     ineffective to the extent of such invalidity or unenforceability without
     rendering invalid or unenforceable the remaining terms and provisions of
     this Agreement or affecting the validity or enforceability of any of the
     terms or provisions of this Agreement in any other jurisdiction. If any
     provision of this Agreement is so broad as to be unenforceable, the
     provision shall be interpreted to be only so broad as is enforceable.
 
          7. Except with respect to the covenants contained in paragraph 3,
     which shall be governed by the terms set forth therein and shall be
     effective only upon consummation of the Merger, the covenants and
     obligations set forth in this Agreement shall expire and be of no further
     force and effect when the Merger Agreement has been terminated.
 
                                      A-57
<PAGE>   136
 
     IN WITNESS WHEREOF, this Agreement has been duly executed under seal and
delivered by the undersigned as of the day and year first above written.
 
<TABLE>
<S>                                                    <C>
WITNESS
 
- -----------------------------------------------------  --------------------------------------------(SEAL)
                                                       Name:
                                                       ---------------------------------------------
                                                                      (Please print or type)
ATTEST:                                                SEACOAST BANKING CORPORATION OF FLORIDA
By:                                                    By:
- -----------------------------------------------------  -------------------------------------------------
    Secretary                                          Executive President
[CORPORATE SEAL]
</TABLE>
 
                                      A-58
<PAGE>   137
 
                                                          EXHIBIT 5 TO AGREEMENT
                                                              AND PLAN OF MERGER
 
                             FORM OF CLAIMS LETTER
 
                                                               February 19, 1997
 
Seacoast Banking Corporation of Florida
P.O. Box 9012
Stuart, Florida 34995-9012
 
Attention: Dennis S. Hudson, III
           Executive Vice President
 
Gentlemen:
 
     This letter is delivered pursuant to Section 9.2(i) of the Agreement and
Plan of Merger ("Merger Agreement") dated as of February 19, 1997 by and
Seacoast Banking Corporation of Florida ("Seacoast") and Port St. Lucie National
Bank Holding Corp. ("PSHC")
 
     Concerning claims which the undersigned may have against PSHC, Seacoast or
any of their respective Subsidiaries in my capacity as an officer, director,
employee, partner, Controlling Person or Affiliate of PSHC or its Subsidiaries,
and in consideration of the premises, and the mutual covenants contained herein
and in the Merger Agreement and the mutual benefits to be derived hereunder and
thereunder, and other good and valuable consideration, the receipt and
sufficiency of which are acknowledged, the undersigned, intending to be legally
bound, I hereby affirm and agree to the following in each and every such
capacity of the undersigned:
 
          1. Claims.  The undersigned does not have, and is not aware of, any
     claims it might have against Seacoast, PSHC or any of their respective
     Subsidiaries, except for (i) compensation for services rendered that have
     accrued but not yet been paid in the ordinary course of business consistent
     with past practice, (ii) contract rights, under loan commitments and
     agreements between the undersigned and PSHC or its subsidiaries,
     specifically limited to possible future advances in accordance with the
     terms of such commitments or agreements, (iii) certificates of deposits,
     (iv) payment obligations under the PSHC Directors Deferred Compensation
     Plan, (if any) consistent with any subject to the terms and conditions of
     the Merger Agreement and the undersigned's Director's Agreement with
     Seacoast (if applicable), and (v) obligations of any PSHC Entity under any
     lease agreement between Harold H. Goldman and PSHC or its subsidiaries
     consistent with Section 4 of the Director's Agreement entered into by the
     undersigned.
 
          2. Releases.  The undersigned hereby releases and forever discharges
     Seacoast, PSHC, and their respective directors, officers, employees,
     agents, attorneys, representatives, Subsidiaries, partners, affiliates,
     controlling persons and insurers, and its successors and assigns, and each
     of them (hereinafter, individually and collectively, the "Releasees") of
     and from any and all liabilities, claims, demands, debts, accounts,
     covenants, agreements, obligations, costs, expenses, actions or causes of
     action of every nature, character or description, now accrued or which may
     hereafter accrue, without limitation and whether or not in law, equity or
     otherwise, based in whole or in part on any facts, conduct, activities,
     transactions, events or occurrences known or unknown, matured or unmatured,
     contingent or otherwise, which have or allegedly have existed, occurred,
     happened, arisen or transpired from the beginning of time to the date of
     the closing of the transactions contemplated by the Merger Agreement,
     except for (i) compensation for services rendered that have accrued but not
     yet been paid in the ordinary course of business consistent with past
     practice or (ii) contract rights, under loan commitments and agreements
     between the undersigned and PSHC or its subsidiaries (collectively, the
     "Claims"). The undersigned represents, warrants and covenants that no Claim
     released herein has been assigned, expressly, impliedly, by operation of
     law or otherwise, and that all Claims released hereby are owned solely by
     the undersigned, which has the sole authority to release them.
 
          3. Indemnity.  The undersigned shall indemnify and hold harmless, to
     the fullest extent permitted by law, the Releasees from and against any and
     all Claims which are released hereby and all claims,
 
                                      A-59
<PAGE>   138
 
     damages, losses, liabilities, actions and expenses, including, without
     limitation, reasonable attorneys' fees and disbursements, arising from, out
     of, or in connection with the performance or nonperformance of any
     obligation of the undersigned hereunder, or any action or proceeding in
     respect thereof.
 
          4. Forbearance.  The undersigned shall forever refrain and forebear
     from commencing, instituting or prosecuting any lawsuit, action, claim or
     proceeding before or in any court, regulatory, governmental, arbitral or
     other authority to collect or enforce any Claims which are released and
     discharged hereby.
 
          5. Miscellaneous.  (a) This Release shall be governed and construed in
     accordance with the laws of the State of Florida (other than the choice of
     law provisions thereof).
 
          (b) This Release contains the entire agreement between the parties
     with respect to the Claims released hereby, and such Release supersedes all
     prior agreements, arrangement or understandings (written or otherwise) with
     respect to such Claims and no representation or warranty, oral or written,
     express or implied, has been made by or relied upon by any party hereto,
     except as expressly contained herein, in the Merger Agreement.
 
          (c) This Release shall be binding upon and inure to the benefit of the
     undersigned and the Releasees and their respective successors and assigns.
 
          (d) This Release may not be modified, amended or rescinded except by
     the written agreement of the undersigned and the Releasees, it being the
     express understanding of the undersigned and the Releasees that no term
     hereof may be waived by the action, inaction or course of delaying by or
     between the undersigned or the Releasees, except in strict accordance with
     this paragraph, and further that the waiver of any breach of this Release
     shall not constitute or be construed as the waiver of any other breach of
     the terms hereof.
 
          (e) The undersigned represents, warrants and covenants that it is
     fully aware of its rights to discuss any and all aspects of this matter
     with any attorney chosen by it, and that it has carefully read and fully
     understands all the provisions of this Release, and that it is voluntarily
     entering into this Release.
 
          (f) This Release is effective when signed by the undersigned and
     delivered to Seacoast and acknowledged by Seacoast, and its operation to
     extinguish all of the Claims released hereby is not dependent on or
     affected by the performance or non-performance of any future act by the
     undersigned or the Releasees.
 
     Unless otherwise defined herein, all capitalized terms shall have the same
meanings as provided in the Merger Agreement.
 
                                          Sincerely,
 
                                          --------------------------------------
                                          Signature of Officer, Director, or
                                          Controlling Person
 
     On behalf of Seacoast, the undersigned thereunto duly authorized,
acknowledges receipt of this letter as of                , 1997.
 
                                          Seacoast Banking Corporation of
                                          Florida
 
                                          By:
                                            ------------------------------------
                                            Name:
                                            Title:
 
                                      A-60
<PAGE>   139
 
                                                                     APPENDIX IV
 
               EXCERPT FROM THE FLORIDA BUSINESS CORPORATION ACT
                 RELATING TO RIGHTS OF DISSENTING SHAREHOLDERS
 
     607.1301 Dissenter's Rights; Definitions.  The following definitions apply
to ss. 607.1302 and 607.132:
 
          (1) "Corporation" means the issuer of the shares held by a dissenting
     shareholder before the corporate action or the surviving or acquiring
     corporation by merger or share exchange of that issuer.
 
          (2) "Fair value," with respect to a dissenter's shares, means the
     value of the shares as of the close of business on the day prior to the
     shareholders' authorization date, excluding any appreciation or
     depreciation in anticipation of the corporate action unless exclusion would
     be inequitable.
 
          (3) "Shareholders' authorization date" means the date on which the
     shareholders' vote authorizing the proposed action was taken, the date on
     which the corporation received written consents without a meeting from the
     requisite number of shareholders in order to authorize the action, or, in
     the case of a merger pursuant to s. 607.1104, the day prior to the date on
     which a copy of the plan of merger was mailed to each shareholder of record
     of the subsidiary corporation.
 
     607.1302 Right of Shareholders to Dissent.  (1) Any shareholder has the
right to dissent from, and obtain payment of the fair value of his shares in the
event of, any of the following corporate actions:
 
          (a) Consummation of a plan of merger to which the corporation is a
     party:
 
             1. If the shareholder is entitled to vote on the merger, or
 
             2. If the corporation is a subsidiary that is merged with its
        parent under s. 607.1104, and the shareholders would have been entitled
        to vote on action taken, except for the applicability of s. 607.1104;
 
          (b) Consummation of a sale or exchange of all, or substantially all,
     of the property of the corporation, other than in the usual and regular
     course of business, if the shareholder is entitled to vote on the sale or
     exchange pursuant to s. 607. 1202, including a sale in dissolution but not
     including a sale pursuant to court order or a sale for cash pursuant to a
     plan by which all or substantially all of the net proceeds of the sale will
     be distributed to the shareholders within 1 year after the date of sale;
 
          (c) As provided in s. 607.0902(11), the approval of a control-share
     acquisition;
 
          (d) Consummation of a plan of share exchange to which the corporation
     is a party as the corporation the shares of which will be acquired, if the
     shareholder is entitled to vote on the plan;
 
          (e) Any amendment of the articles of incorporation if the shareholder
     is entitled to vote on the amendment and if such amendment would adversely
     affect such shareholder by:
 
             1. Altering or abolishing any preemptive rights attached to any of
        his shares;
 
             2. Altering or abolishing the voting rights pertaining to any of
        his shares, except as such rights may be affected by the voting rights
        of new shares then being authorized of any existing or new class or
        series of shares;
 
             3. Effecting an exchange, cancellation, or reclassification of any
        of his shares, when such exchange, cancellation, or reclassification
        would alter or abolish his voting rights or alter his percentage of
        equity in the corporation, or effecting a reduction or cancellation of
        accrued dividends or other arrearages in respect to such shares;
 
             4. Reducing the stated redemption price of any of his redeemable
        shares, altering or abolishing any provision relating to any sinking
        fund for the redemption or purchase of any of his shares, or making any
        of his shares subject to redemption when they are not otherwise
        redeemable;
 
             5. Making noncumulative, in whole or in part, dividends of any of
        his preferred shares which had theretofore been cumulative;
 
                                       D-1
<PAGE>   140
 
             6. Reducing the stated dividend preference of any of his preferred
        shares; or
 
             7. Reducing any stated preferential amount payable on any of his
        preferred shares upon voluntary or involuntary liquidation; or
 
          (f) Any corporate action taken, to the extent the articles of
     incorporation provide that a voting or nonvoting shareholder is entitled to
     dissent and obtain payment for his shares;
 
     (2) A shareholder dissenting from any amendment specified in paragraph
(1)(e) has the right to dissent only as to those of his shares which are
adversely affected by the amendment.
 
     (3) A shareholder may dissent as to less than all the shares registered in
his name. 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;
 
     (4) Unless the articles of incorporation otherwise provide, this section
does not apply with respect to a plan of merger or share exchange or a proposed
sale or exchange of property, to the holders of shares of any class or series
which, on the record date fixed to determine the shareholders entitled to vote
at the meeting of shareholders at which such action is to be acted upon or to
consent to any such action without a meeting, were either registered on a
national securities exchange or designated as a national market system security
on an interdealer quotation system by the National Association of Securities
Dealers, Inc., or held of record by not fewer than 2,000 shareholders.
 
     (5) A shareholder entitled to dissent and obtain payment for his shares
under this section may not challenge the corporate action creating his
entitlement unless the action is unlawful or fraudulent with respect to the
shareholder or the corporation.
 
     607.1320 Procedure for Exercise of Dissenters' Rights.  (1)(a) If a
proposed corporate action creating dissenters' rights under s. 607.1320 is
submitted to a vote at a shareholders' meeting, the meeting notice shall state
that shareholders are or may be entitled to assert dissenters' rights and be
accompanied by a copy of ss. 607.1301, 607.1302, and 607.1320. A shareholder who
wishes to assert dissenters' rights shall:
 
          1. Deliver to the corporation before the vote is taken written notice
     of his intent to demand payment for his shares if the proposed action is
     effectuated, and
 
          2. Not vote his shares in favor of the proposed action. A proxy or
     vote against the proposed action does not constitute such a notice of
     intent to demand payment.
 
     (b) If proposed corporate action creating dissenters' rights under s.
607.1302 is effectuated by written consent without a meeting, the corporation
shall deliver a copy of ss. 607.1301, 607.1302, and 607.1320 to each shareholder
simultaneously with any request for his written consent or, if such a request is
not made, within 10 days after the date the corporation received written
consents without a meeting from the requisite number of shareholders necessary
to authorize the action.
 
     (2) Within 10 days after the shareholders' authorization date, the
corporation shall give written notice of such authorization or consent or
adoption of the plan of merger, as the case may be, to each shareholder who
filed a notice of intent to demand payment for his shares pursuant to paragraph
(1)(a) or, in the case of action authorized by written consent, to each
shareholder, excepting any who voted for, or consented in writing to, the
proposed action.
 
     (3) Within 20 days after the giving of notice to him, any shareholder who
elects to dissent shall file with the corporation a notice of such election,
stating his name and address, the number, classes, and series of shares as to
which he dissents, and a demand for payment of the fair value of his shares. Any
shareholder failing to file such election to dissent within the period set forth
shall be bound by the terms of the proposed corporate action. Any shareholder
filing an election to dissent shall deposit his certificates for certificated
shares with the corporation simultaneously with the filing of the election to
dissent. The corporation may restrict the transfer of uncertificated shares from
the date the shareholder's election to dissent is filed with the corporation.
 
                                       D-2
<PAGE>   141
 
     (4) Upon filing a notice of election to dissent, the shareholder shall
thereafter be entitled only to payment as provided in this section and shall not
be entitled to vote or to exercise any other rights of a shareholder. A notice
of election may be withdrawn in writing by the shareholder at any time before an
offer is made by the corporation, as provided in subsection (5), to pay for his
shares. After such offer, no such notice of election may be withdrawn unless the
corporation consents thereto. However, the right of such shareholder to be paid
the fair value of his shares shall cease, and he shall be reinstated to have all
his rights as a shareholder as of the filing of his notice of election,
including any intervening preemptive rights and the right to payment of any
intervening dividend or other distribution or, if any such rights have expired
or any such dividend or distribution other than in cash has been completed, in
lieu thereof, at the election of the corporation, the fair value thereof in cash
as determined by the board as of the time of such expiration or completion, but
without prejudice otherwise to any corporate proceedings that may have been
taken in the interim, if:
 
          (a) Such demand is withdrawn as provided in this section;
 
          (b) The proposed corporate action is abandoned or rescinded or the
     shareholders revoke the authority to effect such action;
 
          (c) No demand or petition for the determination of fair value by a
     court has been made or filed within the time provided in this section; or
 
          (d) A court of competent jurisdiction determines that such shareholder
     is not entitled to the relief provided by this section.
 
     (5) Within 10 days after the expiration of the period in which shareholders
may file their notices of election to dissent, or within 10 days after such
corporate action is effected, whichever is later (but in no case later than 90
days from the shareholders' authorization date), the corporation shall make a
written offer to each dissenting shareholder who has made demand as provided in
this section to pay an amount the corporation estimates to be the fair value for
such shares. If the corporate action has not been consummated before the
expiration of the 90-day period after the shareholders' authorization date, the
offer may be made conditional upon the consummation of such action. Such notice
and offer shall be accompanied by:
 
          (a) A balance sheet of the corporation, the shares of which the
     dissenting shareholder holds, as of the latest available date and not more
     than 12 months prior to the making of such offer; and
 
          (b) A profit and loss statement of such corporation for the 12-month
     period ended on the date of such balance sheet or, if the corporation was
     not in existence throughout such 12-month period, for the portion thereof
     during which it was in existence.
 
     (6) If within 30 days after the making of such offer any shareholder
accepts the same, payment for his shares shall be made within 90 days after the
making of such offer or the consummation of the proposed action, whichever is
later. Upon payment of the agreed value, the dissenting shareholder shall cease
to have any interest in such shares.
 
     (7) If the corporation falls to make such offer within the period specified
therefor in subsection (5) or if it makes the offer and any dissenting
shareholder or shareholders fail to accept the same within the period of 30 days
thereafter, then the corporation, within 30 days after receipt of written demand
from any dissenting shareholder given within 60 days after the date on which
such corporate action was effected, shall, or at its election at any time within
such period of 60 days may, file an action in any court of competent
jurisdiction in the county in this state where the registered office of the
corporation is located requesting that the fair value of such shares be
determined. The court shall also determine whether each dissenting shareholder,
as to whom the corporation requests the court to make such determination, is
entitled to receive payment for his shares. If the corporation fails to
institute the proceeding as herein provided, any dissenting shareholder may do
so in the name of the corporation. All dissenting shareholders (whether or not
residents of this state), other than shareholders who have agreed with the
corporation as to the value of their shares, shall be made parties to the
proceeding as an action against their shares. The corporation shall serve a copy
of the initial pleading in such proceeding upon each dissenting shareholder who
is a resident of this state in the manner provided by law for
 
                                       D-3
<PAGE>   142
 
the service of a summons and complaint and upon each nonresident dissenting
shareholder either by registered or certified mail and publication or in such
other manner as is permitted by law. The jurisdiction of the court is plenary
and exclusive. All shareholders who are proper parties to the proceeding are
entitled to judgment against the corporation for the amount of the fair value of
their shares. The court may, if it so elects, appoint one or more persons as
appraisers to receive evidence and recommend a decision on the question of fair
value. The appraisers shall have such power and authority as is specified in the
order of their appointment or an amendment thereof. The corporation shall pay
each dissenting shareholder the amount found to be due him within 10 days after
final determination of the proceedings. Upon payment of the judgment, the
dissenting shareholder shall cease to have any interest in such shares.
 
     (8) The judgment may, at the discretion of the court, include a fair rate
of interest, to be determined by the court.
 
     (9) The costs and expenses of any such proceeding shall be determined by
the court and shall be assessed against the corporation, but all or any part of
such costs and expenses may be apportioned and assessed as the court deems
equitable against any or all of the dissenting shareholders who are parties to
the proceeding, to whom the corporation has made an offer to pay for the shares,
if the court finds that the action of such shareholders in failing to accept
such offer was arbitrary, vexatious, or not in good faith. Such expenses shall
include reasonable compensation for, and reasonable expenses of, the appraisers,
but shall exclude the fees and expenses of counsel for, and experts employed by,
any party. If the fair value of the shares, as determined, materially exceeds
the amount which the corporation offered to pay therefor or if no offer was
made, the court in its discretion may award to any shareholder who is a party to
the proceeding such sum as the court determines to be reasonable compensation to
any attorney or expert employed by the shareholder in the proceeding.
 
     (10) Shares acquired by a corporation pursuant to payment of the agreed
value thereof or pursuant to payment of the judgment entered therefor, as
provided in this section, may be held and disposed of by such corporation as
authorized but unissued shares of the corporation, except that, in the case of a
merger, they may be held and disposed of as the plan of merger otherwise
provides. The shares of the surviving corporation into which the shares of such
dissenting shareholders would have been converted had they assented to the
merger shall have the status of authorized but unissued shares of the surviving
corporation.
 
                                       D-4
<PAGE>   143
 
                                                                      APPENDIX V
 
        PROPOSAL 3 -- AMENDMENT OF SEACOAST'S ARTICLES OF INCORPORATION
 
     The Existing Article XI is proposed to be amended to read in its entirety
as follows:
 
                                  "ARTICLE XI
                 MERGER, CONSOLIDATION OR BUSINESS COMBINATION
 
     The affirmative vote of the holders of two-thirds (66 2/3%) of all the
shares of Class A Common Stock outstanding and entitled to vote, voting as a
separate class, and the affirmative vote of the holders of shares with
two-thirds (66 2/3%) of all the votes entitled to be cast by all shares of
Common Stock of all classes outstanding, voting together as a single class,
shall be required to approve any of the following:
 
          (a) any merger or consolidation of this corporation with or into any
     other corporation;
 
          (b) any share exchange in which a corporation, person, or entity
     acquires the issued or outstanding shares of stock of this corporation
     pursuant to a vote of stockholders;
 
          (c) any sale, lease, exchange or other transfer of all, or
     substantially all, of the assets of this corporation or any significant
     subsidiary of this corporation to any other corporation, person or entity;
 
          (d) any transaction similar to, or having a similar affect on, any of
     the foregoing transactions.
 
     Such affirmative votes shall apply and be required whether or not a vote of
the stockholders otherwise would be required by law or the rules of any
securities exchange or market (collectively, an "SRO") on which this corporation
has shares of its capital stock listed or traded and notwithstanding that a
lesser vote of stockholders might otherwise be required by law or SRO; provided,
however no such affirmative votes shall be required where this corporation is
issuing shares of its capital stock or paying cash or other consideration to
acquire, directly or indirectly, another corporation, person or entity."
 
                                       E-5
<PAGE>   144
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20.  INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     The provisions of the Florida Business Corporation Act and Seacoast's
Bylaws set forth the extent to which the Registrant's directors and officers may
be indemnified against liabilities they may incur while serving in such
capacities. Seacoast's Bylaws provide that a director who performs his duties
under the bylaws in good faith shall have no liability by reason of being or
having been a director of the corporation. The Florida Business Corporation
Act's ("FBCA") provisions for indemnification are summarized below.
 
     Section 607.0850(1) of the FBCA empowers a corporation to indemnify any
person who was or is a party to any proceeding (other than an action by, or in
right of, the corporation), by reason of the fact that he is or was a director,
officer, employee, or agent of the corporation or is or was serving at the
request of the corporation as a director, officer, employee, or agent of another
corporation, partnership, joint venture, trust, or other enterprise against
liability incurred in connection with such proceeding, including any appeal
thereof, if he acted in good faith and in a manner he reasonably believed to be
in, or not opposed to, the best interests of the corporation and, with respect
to any criminal action or proceeding, had no reasonable cause to believe his
conduct was unlawful. This Subsection further provides that the termination of
proceeding by judgment, order, settlement, or conviction or upon a plea of nolo
contenders or its equivalent shall not, of itself, create a presumption that the
person did not act in good faith and in a manner which he reasonably believed to
be in, or not opposed to, the beat interests of the corporation or, with respect
to any criminal action or proceeding, had reasonable cause to believe that his
conduct was unlawful.
 
     Section 607.0850(2) empowers a corporation to indemnify any person who was
or is a party to any proceeding by or in the right of the corporation to procure
a judgment in its favor by reason of the fact that he is or was a director,
officer, employee, or agent of the corporation or is or was serving at the
request of the corporation as a director, officer, employee, or agent of another
corporation, partnership, joint venture, trust, or other Enterprise, against
expenses and amounts paid in settlement not exceeding, in the judgment of the
board of directors, the estimated expense of litigating the proceeding to
conclusion, actually and reasonably incurred in connection with the defense or
settlement of such proceeding, including any appeal thereof. Such
indemnification shall be authorized if such person acted in good faith and in a
manner he reasonably believed to be in, or not opposed to, the best interests of
the corporation, except that no indemnification may be made in respect of any
claim, issue, or matter as to which such person shall have been adjudged to be
liable unless, and only to the extent that, the court in which such proceeding
was brought, or any other court of competent jurisdiction shall determine upon
application that, despite the adjudication of liability but in view of all
circumstances of the case, such person is fairly and reasonably entitled to
indemnity for such expenses which such court shall deem proper.
 
     Section 607.0850(3) provides that to the extent that a director, officer,
employee, or agent of a corporation has been successful on the merits or
otherwise in the defense of any proceeding referred to in the preceding
subparagraphs, or in defense of any claim, issue, or matter therein, he shall be
indemnified against expenses actually and reasonably incurred by him in
connection therewith.
 
     Section 607.0850(4) provides that any indemnification under subsections (1)
or (2), unless pursuant to a determination by a court, shall be made by the
corporation only as authorized in a specific case upon a determination that
indemnification of the director, officer, employee, or agent is proper in the
circumstances because the person has met the applicable standard of conduct as
set forth in subsections (1) or (2). Such determination shall be made (a) by the
Board of Directors by a majority vote of a quorum consisting of directors who
are not parties to such proceeding; (b) if such a quorum is not obtaining or,
even if obtainable, by majority vote of a committee duly designated by the board
of directors (in which directors who are parties may participate) consisting
solely of two or more directors who are not at the time parties to the
proceeding; (c) by independent legal counsel selected by the board of directors
described in paragraph (a) or the committee described in paragraph (b), or if a
quorum of the directors cannot be obtained for paragraph (a) and the committee
cannot be designated under paragraph (b), selected by a majority vote of the
full board of
 
                                      II-1
<PAGE>   145
 
directors (in which directors who are parties may participate); or (d) by the
shareholders by a majority vote of a quorum consisting of shareholders who are
not parties to such proceeding or, if no such quorum is obtainable, by a
majority vote of shareholders who were not parties to such proceeding.
 
     Section 607.0850(5) provides that evaluation of the reasonableness of
expenses and authorization of indemnification shall be made in the same manner
as the determination that indemnification is permissible. However, if the
determination of permissibility is made by independent legal counsel, persons
specified by paragraph 4(c) shall evaluate the reasonableness of expenses and
may authorize indemnification.
 
     Section 607.0850(6) provides that expenses incurred by an officer or
director in defending a civil or criminal proceeding may be paid by the
corporation in advance of the final disposition of such proceeding upon receipt
of an undertaking by or on behalf of such director or officer to repay such
amount if he is ultimately found not to be entitled to indemnification by the
corporation. Expenses incurred by other employees and agents may be paid in
advance upon terms or conditions that the board of directors deems appropriate.
 
     Section 607.0850(7) provides that the indemnification and advancement of
expenses provided pursuant to this section are not exclusive, and the
corporation is empowered to make any other or further indemnification or
advancement of expenses of any of its directors, officers, employees, or agents,
under any bylaw, agreement, vote of shareholders or disinterested directors, or
otherwise, both as to action in his official capacity and as to action in
another capacity while holding such office, unless a judgment or other final
adjudication establishes that such person's actions or omissions to act were
material to the cause of action so adjudicated and constitute (a) a violation of
the criminal law, unless such person had reasonable cause to believe that his
conduct was lawful or had no reasonable cause to believe that his conduct was
unlawful; (b) a transaction from which such person derived an improper personal
benefit; (c) in the case of a director, a circumstance under which the liability
provisions of Section 607.0834 of the Florida Business Corporation Act are
applicable; or (d) willful misconduct or a conscious disregard for the best
interests of the corporation in a proceeding by or in the right of the
corporation to procure a judgment in its favor, or in a proceeding by or in the
right of a shareholder.
 
     Section 607.0850(8) provides that indemnification and advancement of
expenses shall continue as, unless otherwise provided when authorized or
ratified, to a person who has ceased to be a director, officer, employee, or
agent, and shall inure to the benefit of such person's heirs, executors and
administrators unless otherwise provided when authorized or ratified.
 
     Section 607.0850(9) provides that unless the corporation's articles of
incorporation provide otherwise, notwithstanding the failure of a corporation to
provide indemnification and despite any contrary determination of the board or
of the shareholders of the specific case, a director, officer, employee, or
agent who is or was a party to a proceeding may apply for indemnification or
advancement of expenses, or both, to the court conducting the proceeding, to the
circuit court, or to another court of competent jurisdiction. On receipt of an
application, the court, after giving any notice that it considers necessary, may
order indemnification and advancement notice that it considers necessary, may
order indemnification and advancement of expenses, including expenses incurred
in seeking court-ordered indemnification or advancement of expenses, if it
determines that (a) the director, officer, employee, or agent is entitled to
mandatory indemnification under subsection (3), in which case the court shall
also order the corporation to pay the director reasonable expenses incurred in
obtaining court-ordered indemnification or advancement or expenses; (b) the
director, officer, employee, or agent is entitled to indemnification or
advancement of expenses, or both, by virtue of the exercise by the corporation
of its power pursuant to subsection (7); or (c) the director, officer, employee,
or agent is failure and reasonably entitled to indemnification or advancement of
expenses, or both, in view of all the relevant circumstances, regardless of
whether such person meet the standard of conduct set forth in subsection (1),
subsection (2), or subsection (7).
 
     Section 607.0850(12) provides that the corporation is empowered to purchase
and maintain insurance on behalf of any person who is or was a director,
officer, employee, or agent of the corporation or is or was serving at the
request of the corporation as a director, officer, employee, or agent of another
corporation, partnership, joint venture, trust, or other enterprise against any
liability asserted against him or incurred by him in any such
 
                                      II-2
<PAGE>   146
 
capacity or arising out of his status as such, whether or not the corporation
would have the power to indemnify him against such liability under the
provisions of this section.
 
     The Registrant maintains an insurance policy insuring the Registrant and
directors and officers of the Registrant against certain liabilities, including
liabilities under the Securities Act of 1933.
 
ITEM 21.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
     (a) Exhibits (See exhibit index immediately preceding the exhibits for the
page number where each exhibit can be found)
 
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                           DESCRIPTION OF EXHIBITS
  -------                          -----------------------
  <C>       <C>  <S>
    2       --   Agreement and Plan of Merger, dated as of February 19, 1997,
                 by and between Seacoast and PSHC (included in APPENDIX I to
                 the Joint Proxy Statement/Prospectus and incorporated by
                 reference herein)
    4.1     --   Specimen Class A Common Stock Certificate (Incorporated
                 herein by reference from Exhibit 4.1 of registrant's
                 Registration Statement on Form S-1, File No. 2-88829)
    4.2     --   Specimen Class B Common Stock Certificate (Incorporated
                 herein by reference from Exhibit 4.2 of the registrant's
                 Registration Statement on Form S-1, File No. 2-88829)
    5       --   Form of Opinion of Alston & Bird LLP, including consent (1)
    8       --   Opinion of Alston & Bird LLP regarding federal income tax
                 matters, including consent (1)
   10.1     --   Profit Sharing Plan (Incorporated by reference from
                 registrant's Statement on Form S-8, File No. 33-22846, dated
                 July 18, 1988)
   10.2     --   Employee Stock Purchase Plan (Incorporated by reference from
                 registrant's Registration Statement on Form S-8, File No.
                 33-25267, dated November 18, 1988)
   10.3     --   Amendment No. 1 to the Employee Stock Purchase Plan
                 (Incorporated herein by reference from registrant's Annual
                 Report on Form 10-K for the fiscal year ended December 31,
                 1990) (Commission File No. 0-13660)
   10.4     --   Executive Employment Agreement (Dated March 22, 1991 between
                 A. Douglas Gilbert and First National Bank and Trust Company
                 of the Treasure Coast, incorporated herein by reference from
                 registrant's Annual Report on Form 10-K for the fiscal year
                 ended December 31, 1990) (Commission File No. 0-13660)
   10.5     --   Executive Employment Agreement (Dated March 22, 1991 between
                 Dennis S. Hudson, III and First National Bank and Trust
                 Company of the Treasure Coast, incorporated herein by
                 reference from registrant's Annual Report on Form 10-K for
                 the fiscal year ended December 31, 1994 (Commission File No.
                 0-13660)
   10.6     --   Executive Employment Agreement (Dated July 31, 1995 between
                 C. William Curtis, Jr. and First National Bank and Trust
                 Company of the Treasure Coast, incorporated herein by
                 reference from registrant's Annual Report on Form 10-K for
                 the fiscal year ended December 31, 1995 (Commission File No.
                 0-13660)
   10.7     --   Executive Employment Agreement (Dated February 19, 1997 by
                 and among J. Hal Roberts, Jr., the First National Bank and
                 Trust Company of the Treasure Coast and Seacoast Banking
                 Corporation of Florida)
   21       --   Subsidiary of the Registrant (Incorporated herein by
                 reference from Exhibit 22 of registrant's Annual Report on
                 Form 10-K for the fiscal year ended December 31, 1991
                 (Commission File No. 0-13660)
   23.1     --   Consent of Arthur Andersen LLP
   23.2     --   Consent of KPMG Peat Marwick LLP
   23.3     --   Consent of Alston & Bird LLP (included in Exhibit 5)
</TABLE>
 
                                      II-3
<PAGE>   147
 
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                           DESCRIPTION OF EXHIBITS
  -------                          -----------------------
  <C>       <C>  <S>
     .4     --   Consent of Jeffrey S. Furst
   23
   23.5     --   Consent of Christopher E. Fogal
   23.6     --   Consent of Austin Associates, Inc.
   23.7     --   Consent of The Robinson-Humphrey Company, Inc.
   24       --   Powers of Attorney (Included in the signature page on pages
                 II-6 and II-7)
   99.1     --   Form of Proxy of Seacoast
   99.2     --   Form of Proxy of PSHC
</TABLE>
 
- ---------------
 
(1) To be filed by amendment.
 
     (b) Financial Statement Schedules
 
     Schedules are omitted because they are not required or are not applicable,
or the required information is shown in the financial statements or notes
thereto.
 
ITEM 22.  UNDERTAKINGS
 
     (a) The undersigned registrant hereby undertakes:
 
          (1) 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. Notwithstanding the foregoing, any
        increase or decrease in volume of securities offered (if the total
        dollar value of securities offered would not exceed that which was
        registered) and any deviation from the low or high and of the estimated
        maximum offering range may be reflected in the form of prospectus filed
        with the Commission pursuant to Rule 424(b) if, in the aggregate, the
        changes in volume and price represent no more than a 20% change in the
        maximum aggregate offering price set forth in the "Calculation of
        Registration Fee" table.
 
             (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; provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii)
        do not apply if the registration statement is on Form S-3, Form S-8 or
        Form F-3, and the information required to be included in a
        post-effective amendment by those paragraphs is contained in periodic
        reports filed the registrant pursuant to Section 13 or 15(d) of the
        Securities Exchange Act of 1934 that are incorporated by reference in
        the registration statement.
 
          (2) That, for the purpose of determining any liability 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.
 
          (3) 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.
 
     (b) 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 Registrant's Articles of Incorporation or Bylaws,
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 Securities Act of 1933
 
                                      II-4
<PAGE>   148
 
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 Securities Act of 1933 and will be governed by the
final adjudication of such issue.
 
     (c) The undersigned registrant hereby undertakes to respond to requests for
information that is incorporated by reference into the prospectus pursuant to
Item 4, 10(b), 11, or 13 of this form, 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 responding to the request.
 
     (d) The undersigned registrant hereby undertakes to supply by means of a
post-effective amendment all information concerning a transaction, and Seacoast
being acquired involved therein, that was not the subject of and included in the
registration statement when it became effective.
 
                                      II-5
<PAGE>   149
 
                                   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 the City of Stuart, State of Florida,
on March 26, 1997.
    
 
                                          SEACOAST BANKING CORPORATION
                                          OF FLORIDA
 
                                          By:    /s/ DENNIS S. HUDSON, III
                                            ------------------------------------
                                                   Dennis S. Hudson, III
                                                  Executive Vice President
 
   
     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Dennis S. Hudson, Jr. and Dennis S.
Hudson, III, and each of them, as true and lawful attorneys-in-fact and agents,
with full power of substitution and resubstitution for him and in his name,
place and stead, in any and all capacities, to sign any and all amendments
(including post-effective amendments) to the Registration Statement, and to file
the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents, and each of them, full power and authority to do
and perform each and every act and thing requisite and necessary to be done in
and about the premises, as fully and to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all which said
attorneys-in-fact and agents or any of them, or their or his substitute or
substitutes, 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 indicated on March 26, 1997.
    
 
<TABLE>
<CAPTION>
                      SIGNATURE                                              TITLE
                      ---------                                              -----
<C>                                                      <S>
 
              /s/ DENNIS S. HUDSON, JR.                  Chairman of the Board
- -----------------------------------------------------
                Dennis S. Hudson, Jr.
 
                 /s/ DALE M. HUDSON                      President and Chief Executive Officer
- -----------------------------------------------------      (principal executive officer)
                   Dale M. Hudson
 
                 /s/ WILLIAM R. HAHL                     Senior Vice President and Chief Financial
- -----------------------------------------------------      Officer (principal financial and accounting
                   William R. Hahl                         officer)
 
              /s/ DENNIS S. HUDSON, III                  Executive Vice President and Chief Operating
- -----------------------------------------------------      Officer
                Dennis S. Hudson, III
 
                                                         Director
- -----------------------------------------------------
                  Jeffrey C. Bruner
 
                                                         Director
- -----------------------------------------------------
                    John H. Crane
 
                /s/ EVANS CRARY, JR.                     Director
- -----------------------------------------------------
                  Evans Crary, Jr.
 
                                                         Director
- -----------------------------------------------------
              John R. Santarsiero, Jr.
 
             /s/ THOMAS H. THURLOW, JR.                  Director
- -----------------------------------------------------
               Thomas H. Thurlow, Jr.
</TABLE>
 
                                      II-6
<PAGE>   150
 
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                          DESCRIPTION OF EXHIBITS
- -------                         -----------------------
<C>      <C>  <S>
     2    --  Agreement and Plan of Merger, dated as of February 19, 1997,
              by and between Seacoast and PSHC (included in APPENDIX I to
              the Joint Proxy Statement/Prospectus and incorporated by
              reference herein)
     4.1  --  Specimen Class A Common Stock Certificate (Incorporated
              herein by reference from Exhibit 4.1 of the registrant's
              Registration Statement on Form S-1, File No. 2-88829)
     4.2  --  Specimen Class B Common Stock Certificate (Incorporated
              herein by reference from Exhibit 4.2 of the registrant's
              Registration Statement on Form S-1, File No. 2-88829)
     5    --  Form of Opinion of Alston & Bird LLP (1)
     8    --  Opinion of Alston & Bird LLP regarding federal income tax
              matters, including consent (1)
    10.1  --  Profit Sharing Plan (Incorporated by reference from
              Registrant's Statement on Form S-8, File No. 33-22846, dated
              July 18, 1988)
    10.2  --  Employee Stock Purchase Plan (Incorporated by reference from
              registrant's Registration Statement on Form S-8, File No.
              33-25267, dated November 18, 1988)
    10.3  --  Amendment No. 1 to the Employee Stock Purchase Plan
              (Incorporated herein by reference from registrant's Annual
              Reports on Form 10-K, dated March 29, 1991)
    10.4  --  Executive Employment Agreement (Dated March 22, 1991 between
              A. Douglas Gilbert and First National Bank and Trust Company
              of the Treasure Coast, incorporated herein by reference from
              registrant's Annual Reports on Form 10-K, dated March 29,
              1991)
    10.5  --  Executive Employment Agreement (Dated March 22, 1991 between
              Dennis S. Hudson, III and First National Bank and Trust
              Company of the Treasure Coast, incorporated herein by
              reference from registrant's Annual Reports on Form 10-K,
              dated March 28, 1995)
    10.6  --  Executive Employment Agreement (Dated July 31, 1995 between
              C. William Curtis, Jr. and First National Bank and Trust
              Company of the Treasure Coast, incorporated herein by
              reference from registrant's Annual Reports on Form 10-K,
              dated March 28, 1996)
    10.7  --  Executive Employment Agreement (Dated February 19, 1997 by
              and among J. Hal Roberts, Jr., the First National Bank and
              Trust Company of the Treasure Coast and Seacoast Banking
              Corporation of Florida)
    21    --  Subsidiary of the Registrant (Incorporated herein by
              reference from Exhibit 22 of registrant's Annual Report on
              Form 10-K, File No. 0-13660, dated March 17, 1992)
    23.1  --  Consent of Arthur Andersen LLP
    23.2  --  Consent of KPMG Peat Marwick LLP
    23.3  --  Consent of Alston & Bird (included in Exhibit 5)
    23.4  --  Consent of Jeffrey S. Furst
    23.5  --  Consent of Christopher E. Fogal
    23.6  --  Consent of Austin Associates, Inc.
    23.7  --  Consent of The Robinson-Humphrey Company, Inc.
    24    --  Powers of Attorney (Included in the signature page on pages
              II-6 and II-7)
    99.1  --  Form of Proxy of Seacoast
    99.2  --  Form of Proxy of PSHC
</TABLE>
    
 
- ---------------
 
1. To be filed by amendment.

<PAGE>   1
 
                                                                    EXHIBIT 10.7
 
                         EXECUTIVE EMPLOYMENT AGREEMENT
 
     THIS EXECUTIVE EMPLOYMENT AGREEMENT (the "Agreement") is entered into as of
this 19th day of February 1997, by and among J. Hal Roberts, Jr. ("Executive"),
the First National Bank and Trust Company of the Treasure Coast (the "Bank") and
the Bank's parent corporation, Seacoast Banking Corporation of Florida (the
"Company").
 
     WHEREAS, the Bank and the Company desire to employ Executive as
President/St. Lucie County and Executive Vice President, respectively, and
Executive desires to serve in such positions; and
 
     WHEREAS, in order to provide adequate assurances to Executive as an
inducement to commence and continue his employment with the Bank and the
Company, the Bank and the Company desire to enter into this Agreement to set
forth the terms of his employment, and to provide for certain payments
contingent upon a change in control of the Bank or the Company as hereinafter
provided ("Change in Control"); and
 
     WHEREAS, Executive desires to enter into this Agreement and to devote his
full time best efforts to the Bank and the Company.
 
     NOW, THEREFORE, in consideration of the mutual covenants and conditions
herein contained, and other good and valuable consideration, the receipt and
sufficiency of which are acknowledged, the parties, intending to be legally
bound, agree as follows:
 
1.  EMPLOYMENT
 
     (a) Bank.  The Bank shall employ Executive as President/St. Lucie County of
the Bank with the duties, responsibilities and powers of such office as assigned
to him as of the Effective Date set forth in Section 2 hereof and as customarily
associated with such office, and Executive shall serve the Bank in such capacity
during the term of this Agreement. Executive acknowledges that such duties,
responsibilities and powers may be increased from time to time by the Board of
Directors of the Bank, that the position held by Executive may be changed to
another executive position with the Company or its subsidiaries, including the
Bank, or Executive's employment may be terminated pursuant to Section 4(c)
hereof by action of the Board of Directors of the Bank prior to a Change in
Control and that such a change in position, duties, responsibilities, powers or
a termination of employment pursuant to Section 4(c) hereof whether prior to or
following a Change in Control shall not entitle Executive to the benefits
provided for in Section 5(c), unless such change or termination is not made in
good faith.
 
     (b) Company.  The Company shall employ Executive as Executive Vice
President of the Company with the duties, responsibilities and powers of such
office as assigned to him as of the Effective Date set forth in Section 2 hereof
and as customarily associated with such office, and Executive shall serve the
Company in such capacity during the term of this Agreement. Executive
acknowledges that such duties, responsibilities and powers may be increased from
time to time by the Board of Directors of the Company, that the position held by
Executive may be changed to another executive position with the Company or its
subsidiaries, including the Bank, or Executive's employment may be terminated
pursuant to Section 4(c) hereof by action of the Board of Directors of the
Company prior to a Change in Control and that such a change in position, duties,
responsibilities, powers or a termination of employment pursuant to Section 4(c)
hereof whether prior to or following a Change in Control shall not entitle
Executive to the benefits provided for in Section 5(c), unless such change or
termination is not made in good faith.
 
     (c) Executive represents, warrants and covenants to the Bank and the
Company that he will be available to commence his duties hereunder immediately
at the Effective Time of the Merger (as defined in Section 2 hereof) and that
this Agreement and his performance of services hereunder does not breach or
conflict with any other agreements or instruments to which Executive is a party
or may be bound, and that he shall faithfully and diligently discharge his
duties and responsibilities under this Agreement, and shall use his best
<PAGE>   2
 
efforts to implement the policies established by the Board of Directors and the
Chief Executive Officer of the Bank and the Company, respectively.
 
     (d) During the term of this Agreement, Executive shall devote his full and
exclusive business time, energy and skill to the businesses of the Bank and the
Company, to the promotion of the interests of the Bank and the Company and to
the fulfillment of Executive's obligations hereunder.
 
2. TERM
 
     This Agreement will become effective (the "Effective Date") immediately
prior to the Effective Time of the merger of Port St. Lucie National Bank
Holding Corporation with and into Seacoast Banking Corporation of Florida (the
"Merger"). The term of this Agreement shall be three (3) years from the
Effective Date, unless further extended by mutual consent of the Bank, the
Company and Executive or sooner terminated as herein provided. Unless 90 days'
prior notice of nonrenewal is given by the Executive, the Bank or the Company
prior to the end of the initial and any subsequent term hereof, this Agreement
shall automatically be renewed on the expiration of the initial term and
annually thereafter through the next succeeding anniversary of this Agreement.
 
     Executive hereby voluntarily terminates and surrenders any rights Executive
may have under any employment, change in control, severance or similar agreement
or understanding, whether written or oral between Executive and Port St. Lucie
National Bank Holding Corporation or any of its affiliates.
 
3.  COMPENSATION AND BENEFITS
 
     The Bank shall pay or provide to Executive the following items as
compensation for his services hereunder:
 
          (i) A base salary of $150,000 per year, payable in monthly
     installments, which base salary may be increased from time to time in
     accordance with normal business practices of the Bank; and
 
          (ii) A grant of stock options to purchase 9,000 shares of Company
     Class A Common Stock under the Company's 1996 Long-term Incentive Plan (the
     "1996 Plan") with an exercise price per share equal to the "fair market
     value" of one share of Company Common Stock on the date that the options
     are granted. Fair market value shall be determined with respect to the
     closing "asked" price of the shares in the over-the-counter market on the
     day on which such value is to be determined (or as otherwise specified in
     the 1996 Plan). Such options will vest ratably over four years. Such grant
     will be made concurrently with the Company's next regularly scheduled grant
     of stock options, and not later than 60 days after the Effective Date.
 
          (iii) Hospitalization insurance (including major medical), long-term
     disability insurance, and life insurance in accordance with the Bank's
     insurance plans for senior management and their dependents as such plans
     may provide and may be modified from time to time; and
 
          (iv) Reasonable club dues.
 
     The above-stated terms of compensation shall not be deemed exclusive or
prevent Executive from receiving any other compensation, including, without
limitation, bonuses, provided by the Bank and/or the Company. Executive shall be
entitled to participate in all current and future employee benefit plans and
arrangements in which the senior management of the Bank is permitted to
participate. The Company does not separately compensate its officers who are
also officers of the Bank and no additional compensation will be payable by the
Company hereunder.
 
                                        2
<PAGE>   3
 
4.  TERMINATION
 
     Executive's employment under this Agreement shall terminate:
 
     (a) Death.  Upon Executive's death; or
 
     (b) Disability.  Upon notice from the Bank to Executive in the event
Executive becomes "permanently disabled." For purposes of this Agreement,
Executive shall be deemed "permanently disabled" if he has been disabled by
bodily or mental illness, disease, or injury, to the extent that, in the opinion
of the Board of Directors, he is prevented from performing his material and
substantial duties of employment, and provided further that such disability has
continued substantially for six (6) months preceding such notice. If requested
by the Bank, Executive shall submit to an examination by a physician selected by
the Bank for the purpose of determining or confirming the existence or extent of
any disability; or
 
     (c) Cause.  Upon notice from the Bank to Executive for cause. For purposes
of this Agreement, "cause" shall be (i) a willful and continued failure by
Executive to perform his duties as President/St. Lucie County of the Bank and
Executive Vice President of the Company as established by their respective
Boards of Directors (other than due to disability), or (ii) a breach by
Executive of his fiduciary duties of loyalty or care to the Bank or the Company,
or (iii) a willful violation by Executive of any provision of this Agreement, or
(iv) a conviction or the entering of a plea of nolo contendere by Executive for
any felony or any crime involving fraud, dishonesty or a breach of trust, or (v)
a breach of the Bank's Code of Ethics, or (vi) commission by Executive of a
willful or negligent act which causes material harm to the Bank or the Company,
or (vii) habitual absenteeism, alcoholism or other form of drug or other
addiction, or (viii) any violation of laws or regulations such that Executive
ceases to be eligible to serve as an executive officer of a depository
institution or a depository institution holding company or (ix) Executive
becomes ineligible to be bonded at costs consistent with the Bank and/or the
Company's other senior officers. In addition, if Executive shall terminate his
employment for a breach of this Agreement by the Bank in accordance with Section
4(e), and it is ultimately determined that no reasonable basis existed for
Executive's termination on account of the alleged default of the Bank and/or the
Company, such event shall be deemed cause for termination by the Bank.
 
     Any notice of termination of Executive's employment with the Bank or the
Company for cause shall set forth in reasonable detail the facts and
circumstances claimed to provide the basis for termination of his employment
under the provisions contained herein and the effective date of termination
("Termination Date"); or
 
     (d) Change in Control.  Upon notice by Executive to the Bank or the Company
following a "Change in Control" (as defined in this Section 4(d)), provided
Executive terminates his employment within one (1) year following the effective
date of such Change in Control. For purposes of this Agreement, a "Change in
Control" shall be deemed to have occurred if (i) the Bank or Company shall
become a direct or indirect subsidiary of, or shall be merged or consolidated
with or into, another entity, which entity is neither controlled by the Company
nor the Bank or if 51% or more of the voting power of shares of (x) Class A
Common Stock, (y) Class B Common Stock or (z) the shares of Class A and Class B
Common Stock voting together as one class, of the resulting entity are not held
by persons who were shareholders of the Company or Bank immediately before the
transaction, subject to the limitations of subparagraph (iii) below; or (ii)
substantially all of the assets of the Company or Bank shall be sold or
transferred to a person or entity, which person or entity is neither controlled
by the Bank nor Company or if 51% or more of the voting power of shares of (x)
Class A Common Stock, (y) Class B Common Stock or (z) the shares of Class A and
Class B Common Stock voting together as one class are not held by persons who
were shareholders of the Bank or Company immediately prior to the asset sale,
subject to the limitations of subparagraph (iii) below; or (iii) any "person"
(as such term is used in Sections 13(d) and 14(d) of the Securities Exchange Act
of 1934), or persons acting together or in concert, and who are not at the date
hereof beneficial owners (individually or collectively) of 10% or more of the
common stock of the Company or the Bank of any class or series become the
"beneficial owner" (as defined in Rule 13(d) of the Securities Exchange Act of
1934 as amended) of securities of the Bank or the Company representing 45% or
more of the voting power of either any individual class of securities
 
                                        3
<PAGE>   4
 
or of any classes which vote together of the Bank's or Company's then
outstanding securities, other than a trustee or other fiduciary holding
securities under an employee benefit plan of the Company or Bank; or
 
     (e) Breach.  Upon notice from Executive to the Bank and/or the Company of
the Bank's and/or the Company's failure to comply with any material provision of
this Agreement, provided that the Bank or the Company, as the case may be, shall
have thirty (30) days from the receipt of such notice to cure any such failure
under this Agreement. If such failure shall be cured or if the Bank shall have
taken steps to cure the failure within the thirty (30) day period, Executive
shall have no right to terminate his employment under the provisions of this
Section 4(e); or
 
     (f) Change in Position or Duties.  Upon notice from Executive to the Bank
and/or the Company in the event Executive is not elected President/St. Lucie
County and Executive Vice President of the Bank and the Company, respectively,
with the duties and powers which are customarily associated with such office;
provided that any change in Executive's title that results from a general
restructuring of the Bank's or Company's title structure shall not result in any
consequence under this Section 4(f); or
 
     (g) Improper Termination by Company.  Upon notice from Executive to the
Bank and/or the Company, as applicable, upon a purported termination of
Executive's employment by the Bank and/or the Company for cause, if it is
ultimately determined that cause did not exist; or
 
     (h) Expiration of Term.  Upon the expiration of the term of this Agreement
as set forth in Section 2.
 
5.  COMPENSATION AND BENEFITS PAYABLE UPON TERMINATION
 
     (a) Upon Executive's death, the Bank shall pay Executive's full base salary
in accordance with the terms set forth in Section 5(c) below. In addition, the
Bank shall continue to pay for and provide to Executive's spouse and eligible
dependents hospitalization insurance (including major medical), and any such
other health insurance benefits comparable to that coverage that would have been
provided under the Bank's group health insurance plan to Executive's spouse and
eligible dependents at the date of Executive's death, at such time in accordance
with the terms set forth in Section 5(c).
 
     (b) In the event Executive becomes permanently disabled and is terminated
as set forth in Section 4(b) above, the Bank shall pay to Executive compensation
and benefits as set forth in Section 5(c) below, provided that Executive's base
salary shall be reduced by any amounts received by Executive under the Bank's
long term disability plan or from any other collateral source payable due to
disability, including, without limitation, social security benefits. If
Executive shall remain permanently disabled beyond the period set forth in
Section 5(c) below, Executive shall receive only such amounts, if any, as are
payable under the Bank's long term disability plan or under any other employee
benefit or welfare plan in which Executive participated and is entitled to
benefits.
 
     (c) If Executive's employment shall be terminated by Executive pursuant to
Sections 4(d), (e), (f) or (g), or by the Bank for any reason other than for
cause as set forth in Section 4(c), the Bank shall continue to pay to Executive
or his estate or beneficiaries his full base salary (including any other cash
compensation) to which Executive would be entitled at the Termination Date or on
the date of a Change in Control, whichever date will result in the greater base
salary, for a period of two (2) years following the Termination Date. In
addition, the Bank shall continue to pay his and his dependents' (to the extent
provided in Section 3(iii) hereof, hospitalization insurance premiums (including
major medical), long term disability premiums and life insurance premiums for a
period of two (2) years or until his earlier death. The compensation and
benefits payable under this Section 5(c) are hereinafter referred to as
"Severance Benefits."
 
     The payment of Severance Benefits is in recognition and consideration of
the continued services by Executive to the Bank and the Company and is not in
any way to be construed as a penalty or damages. Executive shall not be required
to mitigate the amount of any payment of Severance Benefits by seeking other
employment or otherwise. The payment of Severance Benefits shall not affect any
other sums or benefits otherwise payable to Executive under any other employment
compensation or benefit or welfare plan of the Bank.
 
                                        4
<PAGE>   5
 
     (d) In the event termination is for any reason other than as described in
Section 5(a), (b), or (c) above, the Bank shall pay Executive his full salary
through the date of termination and no other compensation or benefits shall be
paid to Executive hereunder; provided, however, that nothing herein shall be
deemed to limit his vested rights under any other benefit, retirement, stock
option or pension plan of the Bank, and the terms of those plans, programs, or
arrangements shall govern.
 
6.  NONCOMPETITION AND NONDISCLOSURE
 
     (a) To induce the Bank and the Company to enter into this Agreement,
Executive agrees that during the term of this Agreement and for a period of two
(2) years after the termination of employment or service of Executive hereunder,
Executive will not, within Martin, Indian River or St. Lucie Counties, Florida
or any other county wherein the Bank, the Company and/or the Company's direct or
indirect subsidiaries conduct business at the date his employment is terminated,
as principal, agent, trustee or through the agency or on behalf of any
corporation, partnership, association, trust or agent or agency, (i) engage in
the business of banking, fiduciary services, securities brokerage, investment
management or services, lending or deposit taking, (ii) control or own
beneficially (directly or indirectly) 5% or more of the outstanding capital
stock or other ownership interest (a "Principal Stockholder") of any corporation
or person engaged in or controlling any such business other than the Company or
Bank, or (iii) serve as an officer, director, trustee, agent or employee of any
corporation, or as a member, employee or agent of any partnership, or as an
owner, trustee, employee or agent of any other business or entity, which
directly or indirectly conducts such business within Martin, Indian River or St.
Lucie Counties, Florida, or any other county wherein the Bank, the Company
and/or the Company's direct or indirect subsidiaries conduct business at the
date his employment is terminated. Executive further agrees that during the term
of this Agreement and for a period of two (2) years after the termination of
employment or service of Executive hereunder, Executive will not solicit any
employee to leave their employment with the Company or Bank or any Company or
Bank subsidiaries for any reason or otherwise interfere with the employment
relationship of the Company, the Bank and such subsidiaries with any employee.
For purposes of this Agreement, it shall be presumed that Executive has
solicited such an employee or interfered with such employee relationships of the
Company, the Bank, or their subsidiaries if Executive serves as an officer,
director, trustee, managing agent or as a Principal Stockholder of any person or
entity which hires or seeks or negotiates the employment or hiring of any such
employee as an officer or other management official or consultant. In the event
that the provisions of this Section 6(a) should be deemed to exceed the time or
geographic limitations permitted by applicable law, then such provisions shall
be reformed automatically to the maximum time or geographic limitations so
permitted. The foregoing notwithstanding, Executive may engage in activities on
behalf of civic, community and charitable nonprofit organization after
termination of employment, and may manage the assets of any such organization
not engaged in the businesses set forth in this Section 6(a).
 
     (b) Executive recognizes and acknowledges that he will have access to
certain confidential information of the Company, the Bank and of their
subsidiaries and affiliates, including, without limitation, customer lists,
information regarding customers, confidential methods of operation, lending,
credit information, organization, pricing, mark-ups, commissions and other
information and that all such information constitutes valuable, special and
unique property of the Company, Bank and their subsidiaries and affiliates. Such
information is herein referred to as "Trade Secrets". The term Trade Secret
shall not include information which is or becomes generally available to the
public other than as a result of a disclosure by Executive or representatives,
agents or affiliates of Executive. Executive will not disclose or directly or
indirectly utilize in any manner, including without limitation to solicit any
customer of the Company, the Bank or their affiliates, except family members of
Executives, any such Trade Secrets for his own benefit or the benefit of anyone
other than the Company, Bank and their subsidiaries and affiliates during the
term of this Agreement and for a period of two (2) years after the term of this
Agreement. In the event of a breach or threatened breach by Executive of the
provisions of this Section 6(b), the Company, the Bank, or any subsidiary or
affiliate of the Company or the Bank shall be entitled to an injunction
restraining Executive and any others from disclosing or utilizing, in whole or
in part, such Trade Secrets. Nothing herein shall be construed as prohibiting or
limiting the Company, Bank, or any subsidiary or affiliate of the Company or the
Bank from exercising any other available
 
                                        5
<PAGE>   6
 
rights or remedies for such breach or threatened breach, including, without
limitation, the recovery of damages from Executive or others.
 
     In the event that Executive is requested or required (by oral questions,
interrogatories, requests for information or documents in legal proceedings,
subpoena, civil investigative demand or other similar process) to disclose any
of the Trade Secrets, Executive shall provide the Company with prompt written
notice of any such request or requirement so that the Company may seek a
protective order or other appropriate remedy and/or waive compliance with the
provisions of this agreement. If, in the absence of a protective order or other
remedy or the receipt of a waiver by the Company, Executive is nonetheless, in
the written opinion of counsel, legally compelled to disclose Trade Secrets to
any tribunal or else stand liable for contempt or suffer other censure or
penalty, Executive may, without liability hereunder, disclose to such tribunal
only that portion of the Trade Secrets which such counsel advises Executive is
legally required to be disclosed, provided that Executive exercises his best
efforts to preserve the confidentiality of the Trade Secrets, including, without
limitation, by cooperating with the Company to obtain an appropriate protective
order or other reliable assurance that confidential treatment will be accorded
the Trade Secrets by such tribunal.
 
7.  ARBITRATION
 
     Any dispute or controversy arising under or in connection with this
Agreement other than as a result of the provisions of Section 6 hereof shall be
settled exclusively by arbitration. Each party shall appoint one arbitrator and
shall notify in writing the other party of such appointment and request the
other party to appoint one arbitrator within thirty (30) days of receipt of such
request. If the party so requested fails to appoint an arbitrator, the party
making the request shall be entitled to designate two arbitrators. The two
arbitrators shall select a third. The written decision of a majority of the
arbitrators shall be binding upon the Bank and Executive and enforceable by law.
The arbitrators shall, by majority vote, determine the place for hearing, the
rules of procedure, and allocation of the expenses of the arbitration. Absent
any written agreement to the contrary, the rules of the American Arbitration
Association shall apply to any arbitration proceedings.
 
8.  APPLICATION OF CODE SECTION 280G
 
     If any payment of Severance Benefits hereunder shall be determined to be an
"excess parachute payment" as defined by Section 280G of the Internal Revenue
Code of 1986, as amended (the "Code"), which subjects Executive to an excise tax
under Section 4999(a) of the Code, the Bank shall pay a supplemental benefit
equal to the excise tax and all state and federal income taxes on the
supplemental benefit. Executive agrees to fully cooperate with the Bank should
the Bank determine to challenge, for whatever reason, any determination by the
Internal Revenue Service that Severance Benefits paid hereunder constitute
"excess parachute payments" as defined by Section 280G of the Code.
 
9.  SUCCESSORS, BINDING AGREEMENT
 
     (a) This Agreement shall be binding upon any successor (whether direct or
indirect, by purchase, merger, consolidation or otherwise) to all or
substantially all of the business and/or assets of the Bank or the Company
regardless of whether such occurrence constitutes a Change in Control hereunder
and the Bank and the Company shall require any such successor to expressly
assume and agree to perform this Agreement. As used in this Agreement, "Company"
and "Bank" shall mean the Company and the Bank as herein respectively defined
and any successors or assigns to their respective business and/or assets as
aforesaid which is required by this Agreement to assume and perform this
Agreement, whether by operation of law or otherwise. In the event any successor
to the Company has total assets in excess of $8 billion and does not maintain a
Florida-based holding company, then the term "successor" shall only include the
bank resulting from such transaction.
 
     (b) This Agreement shall inure to the benefit of and be enforceable by
Executive's personal or legal representatives, executors, administrators,
successors, heirs, distributees, devisees and legatees. If Executive should die
while any amount would still be payable hereunder, all such amounts, unless
otherwise provided
 
                                        6
<PAGE>   7
 
herein, shall be paid in accordance with the terms of this Agreement to
Executive's devisee, legatee or other designee or, if there is no such designee,
to Executive's estate.
 
10.  MISCELLANEOUS
 
     (a) All notices required or permitted hereunder shall be given in writing
by actual delivery or by Registered or Certified Mail (postage prepaid) at the
following addresses or at such other places as shall be designated in writing:
 
     Executive:
 
          Mr. J. Hal Roberts, Jr.
 
        --------------------------------------------
 
        --------------------------------------------
 
     Bank or the Company:
 
        815 Colorado Avenue
        Stuart, Florida 34994
        Attn: Mr. Dennis S. Hudson, III
 
     (b) If any provision of this Agreement shall be determined to be void by
any court or arbitrium of competent jurisdiction, then such determination shall
not affect any other provision of this Agreement, all of which shall remain in
full force and effect.
 
     (c) The failure of the parties to complain of any act or omission on the
part of either party, no matter how long the same may continue, shall not be
deemed to be a waiver of any of its rights hereunder.
 
     (d) This Agreement may be executed in two or more counterparts, each of
which shall be deemed an original, but all of which shall constitute one and the
same instrument. It may be modified or terminated only by a writing signed by
the party against whom enforcement of any waiver, change, modification,
extension, discharge or termination is sought.
 
     (e) The recitals contained in this Agreement are expressly made a part
hereof.
 
     (f) This Agreement represents the entire understanding and agreement among
the parties and supersedes any prior agreements or understandings with respect
to the subject matter hereof. It is intended and agreed that the Company, the
Bank and its direct and indirect subsidiaries are express beneficiaries of this
Agreement and may enforce the provisions hereof to the same extent as the Bank.
 
     (g) This Agreement shall be governed by, and construed in accordance with,
the laws of the State of Florida.
 
                                        7
<PAGE>   8
 
     IN WITNESS WHEREOF, Executive has executed this Agreement and the Bank and
the Company have caused this Agreement to be executed under seal by their
respective undersigned officers, thereunto duly authorized, as of the day and
year first above written.
 
                                          EXECUTIVE
 
   
                                                /s/ J. HAL ROBERTS, JR.
    
 
                                          --------------------------------------
   
                                                   J. Hal Roberts, Jr.
    
 
                                          FIRST NATIONAL BANK AND TRUST
                                          COMPANY OF THE TREASURE COAST
 
   
                                          By:    /s/ DENNIS S. HUDSON, III
    
                                            ------------------------------------
   
                                            Name: Dennis S. Hudson, III
    
   
                                            Title: President
    
 
                                          SEACOAST BANKING CORPORATION
                                          OF FLORIDA
 
   
                                          By:    /s/ DENNIS S. HUDSON, III
    
                                            ------------------------------------
   
                                            Name: Dennis S. Hudson, III
    
   
                                            Title: Executive Vice President and
    
   
                                               Chief Operating Officer
    
 
                                        8
<PAGE>   9
 
                                                                     APPENDIX II
 
   
                            FORM OF FAIRNESS OPINION
    
 
                                 March 25, 1997
 
   
Board of Directors
    
Port St. Lucie National Bank Holding Corp.
1100 S.W. St. Lucie W. Blvd.
Port St. Lucie, FL 34996
 
Members of the Board:
 
     You have requested our opinion as to the fairness, from a financial point
of view, to Port St. Lucie National Bank Holding Corp. ("PSHC") and its
shareholders of terms of the Agreement and Plan of Merger dated February 19,
1997 ("Agreement") by and between Seacoast Banking Corporation of Florida
("Seacoast") and PSHC. The Agreement provides for the merger of PSHC with and
into Seacoast (the "Merger").
 
     The terms of the Agreement provide for the aggregate issuance of 900,000
shares of Seacoast Class A Common Stock to PSHC common shareholders, option
holders and warrant holders (collectively referred to as "shareholders"). The
exchange ratio to PSHC common shareholders (the "Stock Exchange Ratio") shall be
determined by dividing the Purchase Price Per Share by the Seacoast Stock Price,
both terms being defined in the Agreement. PSHC options will be convened into
the right to purchase Seacoast Common Stock, adjusted for the Stock Exchange
Ratio. The exchange ratio to warrant holders (the "Warrant Exchange Ratio")
shall be determined by dividing (i) the difference between the Purchase Price
Per Share and $8.26 (the exercise price for all warrants) by (ii) the Seacoast
Stock Price. PSHC has the right to terminate the transactions the Purchase Price
Per Share is less than $24.62.
 
     In carrying out our engagement, we have reviewed and analyzed material
bearing upon the financial and operating condition of PSHC and Seacoast
including but not limited to the following: (i) the audited financial statements
of PSHC and Seacoast for the period 1991 through 1996; (ii) the reported prices
and stock trading activity of PSHC and Seacoast; (iii) publicly available
information regarding the performance of certain other companies whose business
activities were, believed to be generally comparable to those of PSHC and
Seacoast; (iv) the financial terms, to the extent publicly available, of certain
comparable bank merger transactions; (v) the strategic objectives of the Merger
and the synergies and other benefits of the Merger for the combined company as
described by senior management of PSHC and Seacoast; and (vi) such other
analysis and information as we deemed relevant.
 
     In our review and analysis, we relied upon and assumed the accuracy and
completeness of the financial and other information provided to us or publicly
available, and have not attempted to verify the same. We have made no
independent verification as to the assets or properties of PSHC or Seacoast, and
have instead relied upon representations and information of PSHC and Seacoast,
in the aggregate. In rendering our opinion, we have assumed that the transaction
will be a tax-free reorganization with no material adverse tax consequences to
PSHC or Seacoast, or to PSHC shareholders. We have assumed in the course of
obtaining the necessary regulatory approvals for the transaction, no condition
will be imposed that will have a material adverse effect on the contemplated
benefits of the transaction to PSHC and its shareholders.
 
     Austin Associates participated in discussions and negotiations with
representatives of PSHC and Seacoast and their financial and legal advisors. For
our services, including the rendering of this opinion, PSHC will pay us a fee
and indemnify us against certain liabilities, including liabilities under the
securities laws.
 
     We consent to the use of this opinion in the Joint Proxy
Statement/Prospectus which is a part of Seacoast's Registration Statement on
Form S-4.
<PAGE>   10
 
     Based upon our analysis and subject to the qualifications described herein,
we believe that, as of the date of this letter, the terms of the Merger are
fair, from a financial point of view, to PSHC and its shareholders.
 
Austin Associates, Inc.
 
   
By:   
         /s/ RICHARD F. MARONEY, JR.
    ----------------------------------
   
         Richard F. Maroney, Jr.
    
   
       Executive Vice President and
                Principal
    
 
   
March 25, 1997
    
 
                                        2

<PAGE>   1
 
                                                                    EXHIBIT 23.1
 
                         CONSENT OF ARTHUR ANDERSEN LLP
 
     As independent certified public accountants, we hereby consent to the use
of our report (and to all references to our Firm) included in or made a part of
this registration statement.
 
                                          /s/ ARTHUR ANDERSEN LLP
 
Miami, Florida
   
March 24, 1997
    

<PAGE>   1
 
                                                                    EXHIBIT 23.2
 
                        CONSENT OF KPMG PEAT MARWICK LLP
 
The Board of Directors and Shareholders
Port St. Lucie National Bank Holding Corp.:
 
     We consent to the use of our report incorporated herein (the Form S-4
Registration Statement of Seacoast Banking Corporation of Florida) by reference
and to the reference to our firm under the heading "Experts" in the Joint Proxy
Statement/Prospectus. Our report refers to a change in the accounting for
mortgage servicing rights to conform with Statement of Financial Accounting
Standards No. 122.
 
                                          /s/ KPMG Peat Marwick LLP
 
   
West Palm Beach, Florida
    
   
March 26, 1997
    

<PAGE>   1
 
                                                                    EXHIBIT 23.4
 
                          CONSENT OF JEFFREY S. FURST
 
   
     The undersigned hereby consents, pursuant to Rule 438 of the Securities Act
of 1933, as amended, to the references made to the undersigned under the caption
"Description of the Merger" and as a proposed director of Seacoast and FNB in
the Proxy Statement constituting part of the Registration Statement on Form S-4
of Seacoast Banking Corporation of Florida.
    
 
                                                 /s/ JEFFREY S. FURST
                                          --------------------------------------
                                                     Jeffrey S. Furst
 
   
Port St. Lucie, Florida
    
   
March 24, 1997
    

<PAGE>   1
 
                                                                    EXHIBIT 23.5
 
                        CONSENT OF CHRISTOPHER E. FOGAL
 
   
     The undersigned hereby consents, pursuant to Rule 438 of the Securities Act
of 1933, as amended, to the references made to the undersigned under the caption
"Description of the Merger" and as a proposed director of Seacoast and FNB in
the Proxy Statement constituting part of the Registration Statement on Form S-4
of Seacoast Banking Corporation of Florida.
    
 
                                               /s/ CHRISTOPHER E. FOGAL
                                          --------------------------------------
                                                   Christopher E. Fogal
 
   
Port St. Lucie, Florida
    
   
March 24, 1997
    

<PAGE>   1
 
                                                                    EXHIBIT 23.6
 
                                    CONSENT
 
     We hereby consent to the discussion relative to our opinion delivered to
the Board of Directors of Port St. Lucie National Bank Holding Corporation in
connection with its proposed merger with Seacoast Banking Corporation of Florida
in the Joint Proxy Statement/Prospectus included in Seacoast's Registration
Statement on Form S-4 under the heading "Opinion of PSHC's Financial Advisor,"
to the references to our firm in such Joint Proxy Statement/Prospectus and to
the inclusion of such opinion as an Appendix to the Joint Proxy
Statement/Prospectus.
 
                                          Austin Associates, Inc.
 
                                          By:            /s/ RICHARD F. MARONEY,
                                          JR.
                                          --------------------------------------
                                                 Richard F. Maroney, Jr.
                                          Executive Vice President and Principal
 
March 25, 1997

<PAGE>   1
 
                                                                    EXHIBIT 23.7
 
                 CONSENT OF THE ROBINSON-HUMPHREY COMPANY, INC.
 
     We consent to the inclusion in this Registration Statement on Form S-4 of
Seacoast Banking Corporation of Florida of the form of our letter to the Board
of Directors of Seacoast Banking Corporation of Florida, included as Appendix
     to the Proxy Statement/Prospectus that is part of the Registration
Statement, and to the references to such letter and to our firm in such Proxy
Statement/Prospectus. In giving such consent, we do not thereby admit that we
come 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 Securities
Exchange Commission thereunder.
 
                                        THE ROBINSON-HUMPHREY COMPANY, INC.
 
                                        By:    /s/ GERARD J. O'MEARA, JR.
                                           -------------------------------------
                                                  Gerard J. O'Meara, Jr.
                                                     Managing Director
 
March 26, 1997

<PAGE>   1
 
                                                                    EXHIBIT 99.1
 
                           PRELIMINARY FORM OF PROXY
 
                    SEACOAST BANKING CORPORATION OF FLORIDA
 
                         ANNUAL MEETING OF SHAREHOLDERS
 
     The undersigned hereby constitutes and appoints        and        , or
either of them, as proxies, each with full power of substitution, to vote the
number of shares of common stock of Seacoast Banking Corporation of Florida, a
Florida corporation ("Seacoast") which the undersigned would be entitled to vote
if personally present at the Annual Meeting of Seacoast Shareholders to be held
at the Indian River Plantation Beach Resort, Hutchinson Island, 555 N.E. Ocean
Boulevard, Stuart, Florida, on             , 1997, at 3:00 P.M., Local Time, and
at any adjournment or postponement thereof (the "Annual Meeting") upon the
proposals described in the Proxy Statement/Prospectus and the Notice of Annual
Meeting of Shareholders, both dated             , 1997, the receipt of which is
acknowledged in the manner specified below.
 
     1. Merger.  To approve, ratify, confirm and adopt the Agreement and Plan of
Merger, dated as of February 19, 1997 (the "Merger Agreement"), by and between
Seacoast and Port St. Lucie National Bank Holding Corp., a Florida corporation
("PSHC"), pursuant to which PSHC will merge (the "Merger") with and into
Seacoast and Seacoast shall issue up to 900,000 shares of Seacoast Class A
Stock.
 
            FOR  [ ]            AGAINST  [ ]            ABSTAIN  [ ]
 
     2. Election Of Directors

                    FOR all nominees for director listed below.              
     --------------                  (except as marked to the contrary below)
                                                                             
 
                    WITHHOLD AUTHORITY                                 
     --------------                   (to vote for all nominees listed)
                                                                       
 
<TABLE>
<S>                                    <C>
Jeffrey C. Bruner                      Dennis S. Hudson, Jr.
John H. Crane                          Dennis S. Hudson, III
Evans Crary, Jr.                       John R. Santarsiero, Jr.
Dale M. Hudson                         Thomas H. Thurlow, Jr.
</TABLE>
 
     To withhold authority to vote for any individual nominee, write that
nominee's name in the space provided below.
              ---------------------------------------------------
 
     3. Amendments to the Articles of Incorporation.  To approve a proposed
amendment to Article XI Seacoast's Articles of Incorporation to clarify the
voting requirements in connection with certain business combinations.
 
            FOR  [ ]            AGAINST  [ ]            ABSTAIN  [ ]
 
     4. Ratification of Appointment of Auditors.  Proposal to ratify the
appointment of Arthur Andersen LLP as independent auditors for Seacoast for the
fiscal year ending December 31, 1997.
 
            FOR  [ ]            AGAINST  [ ]            ABSTAIN  [ ]
 
     5. In the discretion of the proxies on such other matters as may properly
come before the meeting or any adjournments thereof.
 
                         AUTHORIZED                         NOT AUTHORIZED
              ---------                          ---------                
                                                  
 
     THIS PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED IN THE MANNER DIRECTED
HEREIN BY THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL
BE VOTED FOR PROPOSALS 1, 2, 3 AND 4 ABOVE.
<PAGE>   2
 
     Please sign this proxy exactly as your name appears below. When shares are
held jointly, both should sign. When signing as attorney, executor,
administrator, trustee or guardian, please give full title as such. If a
corporation, please sign in full corporate name by President or other authorized
officer. If a partnership, please sign in partnership name by authorized person.
 
                                          
                                          DATED:                         , 1997
                                          -------------------------------     
 
                                          --------------------------------------
                                          Signature
 
                                          --------------------------------------
                                          Signature if held jointly
 
     THIS PROXY IS SOLICITED BY THE BOARD OF DIRECTORS OF SEACOAST BANKING
CORPORATION OF FLORIDA, AND MAY BE REVOKED PRIOR TO ITS EXERCISE.
 
                                        2

<PAGE>   1
 
                                                                    EXHIBIT 99.2
 
                           PRELIMINARY FORM OF PROXY
 
                   PORT ST. LUCIE NATIONAL BANK HOLDING CORP.
 
                        SPECIAL MEETING OF SHAREHOLDERS
 
     The undersigned hereby constitutes and appoints               and
       , or either of them, as proxies, each with full power of substitution, to
vote the number of shares of common stock of Port St. Lucie National Bank
Holding Corp., a Florida corporation ("PSHC") which the undersigned would be
entitled to vote if personally present at the Special Meeting of PSHC
Shareholders to be held at                             , on             , 1997,
at 3:00 P.M., Local Time, and at any adjournment or postponement thereof (the
"Special Meeting") upon the proposals described in the Proxy
Statement/Prospectus and the Notice of Annual Meeting of Shareholders, both
dated             , 1997, the receipt of which is acknowledged in the manner
specified below.
 
     1. MERGER.  To approve, ratify, confirm and adopt the Agreement and Plan of
Merger, dated as of February 19, 1997 (the "Merger Agreement"), by and between
Seacoast Banking Corporation of Florida, a Florida corporation ("Seacoast") and
PSHC pursuant to which (i) PSHC will merge (the "Merger") with and into
Seacoast; (ii) each share of the $.01 par value common stock of PSHC ("PSHC
Common Stock") issued and outstanding at the effective time of the Merger will
be exchanged for that number of shares of $.10 par value Class A common stock of
Seacoast ("Seacoast Class A Stock") determined by dividing (A) (i) the sum of
(x) the average of the closing prices on the Nasdaq National Market of Seacoast
Class A Stock for the 20 trading days preceding the fifth trading day preceding
the Closing Date (the "Seacoast Stock Price") multiplied by 900,000 and (y)
$1,242,953, (ii) divided by the number of shares of PSHC Common Stock plus the
number of shares of PSHC Common Stock subject to PSHC stock options and PSHC
stock warrants, outstanding at the Effective Time (the "Purchase Price Per
Share"), by (B) the Seacoast Stock Price; (iii) each outstanding PSHC stock
warrant at the effective time of the Merger will be exchanged for that number of
shares of Seacoast Class A Stock determined by dividing (A) the difference
between the Purchase Price Per Share and $8.26 by (B) the Seacoast Stock Price;
and (iv) Seacoast will assume the obligations of PSHC under various stock plans
and programs and adopt substitute plans where appropriate, all as more fully
described in the accompanying Joint Proxy Statement/Prospectus. The
consideration to be received by holders of PSHC common stock and PSHC warrants
is subject to possible adjustment in certain circumstances relating to certain
categories of PSHC loans as described in the accompanying Joint Proxy
Statement/Prospectus.
 
            FOR  [ ]            AGAINST  [ ]            ABSTAIN  [ ]
 
     2. In the discretion of the proxies on such other matters as may properly
come before the meeting or any adjournments thereof.
 
                 [ ]  AUTHORIZED            [ ]  NOT AUTHORIZED
 
     THIS PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED IN THE MANNER DIRECTED
HEREIN BY THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL
BE VOTED FOR PROPOSAL 1 ABOVE.
<PAGE>   2
 
     Please sign this proxy exactly as your name appears below. When shares are
held jointly, both should sign. When signing as attorney, executor,
administrator, trustee or guardian, please give full title as such. If a
corporation, please sign in full corporate name by President or other authorized
officer. If a partnership, please sign in partnership name by authorized person.
 
                                          
                                          Dated:                          , 1997
                                          --------------------------------
                                              
 
                                          --------------------------------------
                                                        Signature
 
                                          --------------------------------------
                                                Signature if held jointly
 
  THIS PROXY IS SOLICITED BY THE BOARD OF DIRECTORS OF PORT ST. LUCIE NATIONAL
         BANK HOLDING CORP., AND MAY BE REVOKED PRIOR TO ITS EXERCISE.
 
                                        2


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