CORESTATES FINANCIAL CORP
8-K, 1995-10-20
NATIONAL COMMERCIAL BANKS
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<PAGE>
 
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549



                                    FORM 8-K


                                 CURRENT REPORT


                       Pursuant to Section 13 or 15(d) of
                      the Securities Exchange Act of 1934



                               October 10, 1995
    -------------------------------------------------------------------   
               Date of Report (Date of earliest event reported)



                           CoreStates Financial Corp
      -------------------------------------------------------------------
            (Exact name of registrant as specified in its charter)


                                 Pennsylvania
      -------------------------------------------------------------------
                (State or other jurisdiction of incorporation)

         0-6879                                           23-1899716
- --------------------------------------------------------------------------------

(Commission File Number)                       (IRS Employer Identification No.)


Philadelphia National Bank Building, Broad & Chestnut Streets,
P.O. Box 7618, Philadelphia, Pennsylvania                19101     
- -------------------------------------------------------------------          
Address of principal executive offices)                (Zip Code)


                                (215) 973-3827
      -------------------------------------------------------------------
             (Registrant's telephone number, including area code)
<PAGE>
 
Item 5.   Other Events.
          ------------ 


          CoreStates Financial Corp, a Pennsylvania corporation (the
"registrant" or "CoreStates"), and Meridian Bancorp, Inc., a Pennsylvania
corporation ("Meridian"), have entered into an Agreement and Plan of Merger,
dated as of October 10, 1995 (the "Merger Agreement"), whereby Meridian will be
merged with and into the registrant with the registrant as the surviving entity
(the "Merger").

          As a result of the Merger, each outstanding share of common stock of
Meridian will be converted into 1.225 shares of common stock of CoreStates.  The
Merger was announced in a press release issued by the registrant and Meridian on
October 10, 1995.

          Concurrently with the execution and delivery of the Merger Agreement,
the registrant entered into a Stock Option Agreement (the "CoreStates Stock
Option Agreement") with Meridian whereby the registrant has granted to Meridian
an option to purchase up to 27,643,009 shares of the registrant's common stock
at a price of $38.50 per share, exercisable only upon the occurrence of certain
events.  Meridian has also entered into a Stock Option Agreement (together with
the CoreStates Stock Option Agreement, the "Stock Option Agreements") with the
registrant whereby Meridian has granted to the registrant an option to purchase
up to 11,506,698 shares of Meridian's common stock at a price of $38 13/16 per
share, exercisable only upon the occurrence of certain events.  The Stock Option
Agreements each provide the grantee (a) with the right, in certain
circumstances, to require the issuer to repurchase the option and any shares
acquired by exercise of the option and (b) with the right to require the issuer
to register the common stock acquired by or issuable upon exercise of the option
under the Securities Act of 1933, as amended.

          The closing of the Merger is subject to certain conditions, including
the approval of the common stockholders of both the registrant and Meridian and
the obtaining of certain regulatory approvals.

          The Merger Agreement, the Stock Option Agreements and the registrant's
press release issued October 10, 1995 regarding the Merger are attached as
exhibits to this report and are incorporated herein by reference.  The foregoing
summaries of the Merger Agreement and the Stock Option Agreements do not purport
to be complete and are qualified in their entirety by reference to such
exhibits.
<PAGE>
 
Item 7.   Financial Statements, Pro Forma Financial
          -----------------------------------------
          Statements and Exhibits.
          ----------------------- 

          The following exhibits are filed with this report:

Exhibit Number                   Description
- --------------                   -----------

     2                           Agreement and Plan of Merger, dated as of
                                 October 10, 1995, between the registrant and
                                 Meridian.

     10(a)                       Stock Option Agreement, dated as of October 10,
                                 1995, between Meridian and the registrant.

     10(b)                       Stock Option Agreement, dated as of
                                 October 10, 1995, between the registrant and
                                 Meridian.

     20                          Press release of the registrant, issued October
                                 10, 1995, regarding the Merger.
<PAGE>
 
                                   SIGNATURE

          Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned there unto duly authorized.


                                       CORESTATES FINANCIAL CORP 
                                                                 
                                                                 
                                       By /s/David T. Walker     
                                          -------------------    
                                           Name:  David T. Walker
                                           Title: Senior Vice    
                                                    President     


Dated:  October 19, 1995.
<PAGE>
 
                                 EXHIBIT INDEX
<TABLE>
<CAPTION>
 
 Exhibit No.            Description           Page
 -----------            -----------           ----
 
<S>            <C>                            <C>
      2        Agreement and Plan of
               Merger, dated as of October
               10, 1995, between the
               registrant and Meridian.
    10(a)      Stock Option Agreement,
               dated as of October 10,
               1995, between Meridian and
               the registrant.
    10(b)      Stock Option Agreement,
               dated as of October 10,
               1995, between the registrant
               and Meridian.
     20        Press Release of the
               registrant issued October
               10, 1995, regarding the
               Merger.
 
</TABLE>

<PAGE>
 
                                                                       Exhibit 2

                          AGREEMENT AND PLAN OF MERGER

                          dated as of October 10, 1995

                                 by and between

                             MERIDIAN BANCORP, INC.

                                      and

                           CORESTATES FINANCIAL CORP
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------
<TABLE>

<S>                                                                         <C>
I.    THE MERGER; EFFECTS OF THE MERGER......................................  2
      ---------------------------------
      1.01.  The Merger......................................................  2
             ----------

II.   CONSIDERATION..........................................................  3
      -------------
      2.01.  Merger Consideration............................................  3
             -------------------- 
      2.02.  Shareholder Rights; Stock Transfers.............................  3
             -----------------------------------
      2.03.  Fractional Shares...............................................  3
             -----------------
      2.04.  Exchange Procedures.............................................  4
             -------------------
      2.05.  Anti-Dilution Provisions........................................  6
             ------------------------
      2.06.  Treasury Shares.................................................  6
             ---------------
      2.07.  Options.........................................................  6
             -------

III.  ACTIONS PENDING MERGER.................................................  7
      ----------------------
      3.01.  Ordinary Course.................................................  7
             ---------------
      3.02.  Capital Stock...................................................  7
             -------------
      3.03.  Dividends; Changes in Stock.....................................  8
             ---------------------------
      3.04.  Compensation; Employment Agreements; Etc. ......................  8
             ----------------------------------------
      3.05.  Benefit Plans...................................................  8
             -------------
      3.06.  Acquisitions and Dispositions...................................  9
             -----------------------------
      3.07.  Amendment.......................................................  9
             ---------
      3.08.  Accounting Methods..............................................  9
             ------------------
      3.09.  Adverse Actions.................................................  9
             ---------------
      3.10.  Indebtedness.................................................... 10
             ------------
      3.11.  Agreements...................................................... 10
             ----------

IV.   REPRESENTATIONS AND WARRANTIES......................................... 10
      ------------------------------
      4.01.  Disclosure Letters.............................................. 10
             ------------------
      4.02.  Standard........................................................ 10
             --------
      4.03.  Representations and Warranties.................................. 10
             ------------------------------

V.    COVENANTS.............................................................. 21
      --------- 
      5.01.  Reasonable Best Efforts......................................... 21
             -----------------------
      5.02.  Shareholder Approvals........................................... 21
             ---------------------
      5.03.  Registration Statement.......................................... 22
             ----------------------
      5.04.  Press Releases.................................................. 23
             --------------
      5.05.  Access; Information............................................. 23
             -------------------
      5.06.  Acquisition Proposals........................................... 24
             ---------------------
      5.07.  Affiliate Agreements............................................ 25
             --------------------
      5.08.  Certain Modifications........................................... 25
             ---------------------
      5.09.  Takeover Laws................................................... 25
             -------------
      5.10.  Shares Listed................................................... 25
             -------------
      5.11.  Regulatory Applications......................................... 25
             -----------------------
      5.12.  Indemnification................................................. 26
             ---------------
      5.13.  Benefit Plans................................................... 28
             -------------
      5.14.  Certain Director and Officer Positions.......................... 30
             --------------------------------------
      5.15.  Notification of Certain Matters................................. 31
             -------------------------------
      5.16.  Dividend Adjustment............................................. 31
             -------------------
      5.17.  Post-Merger Operations.......................................... 31
             ----------------------

VI.   CONDITIONS TO CONSUMMATION OF THE MERGER............................... 31
      ----------------------------------------
      6.01.  Shareholder Vote................................................ 31
             ---------------- 
</TABLE>

                                      (i)
<PAGE>
 
<TABLE>
<S>                                                                          <C>
 
      6.02.  Regulatory Approvals............................................ 32
             --------------------
      6.03.  Third Party Consents............................................ 32
             --------------------
      6.04.  No Injunction, Etc. ............................................ 32
             ------------------
      6.05.  Pooling Letters................................................. 32
             ---------------
      6.06.  Representations, Warranties and Covenants of CoreStates......... 32
             -------------------------------------------------------
      6.07.  Representations, Warranties and Covenants of Meridian........... 33
             -----------------------------------------------------
      6.08.  Effective Registration Statement................................ 33
             --------------------------------
      6.09.  Blue-Sky Permits................................................ 33
             ----------------
      6.10.  Tax Opinion..................................................... 33
             -----------
      6.11.  NYSE Listing.................................................... 33
             ------------
      6.12.  Rights Agreements............................................... 33
             -----------------

VII.  TERMINATION............................................................ 34
      -----------
      7.01.  Termination..................................................... 34
             -----------
      7.02.  Effect of Termination and Abandonment........................... 37
             -------------------------------------

VIII.  OTHER MATTERS......................................................... 37
       -------------
      8.01.  Survival........................................................ 37
             --------
      8.02.  Waiver; Amendment............................................... 37
             -----------------
      8.03.  Counterparts.................................................... 37
             ------------
      8.04.  Governing Law................................................... 37
             -------------
      8.05.  Expenses........................................................ 37
             --------
      8.06.  Confidentiality................................................. 38
             ---------------
      8.07.  Notices......................................................... 38
             -------
      8.08.  Definitions..................................................... 39
             -----------
      8.09.  Entire Understanding; No Third Party Beneficiaries.............. 40
             --------------------------------------------------
      8.10.  Headings........................................................ 41
             --------
</TABLE>

                                     (ii)
<PAGE>
 
                                LIST OF EXHIBITS
                                ----------------

A -  Form of Meridian Stock Option Agreement

B -  Form of CoreStates Stock Option Agreement

C -  Amendment to Meridian Rights Agreement

D -  Form of Meridian Affiliate Letter

E -  Form of CoreStates Affiliate Letter

F -  Section 5.13(a) Termination Agreement Term Sheet

G -  Section 5.13(b) Termination Agreement

H -  Meridian Severance Policy



                                   Schedules
                                   ---------

5.13(a) - Meridian employees to receive Meridian termination agreements

5.13(b) - Meridian employees to receive CoreStates termination agreements


                                     (iii)
<PAGE>
 
                          AGREEMENT AND PLAN OF MERGER
                          ----------------------------


     AGREEMENT AND PLAN OF MERGER, dated as of the 10th day of October, 1995
(this "Plan"), by and between MERIDIAN BANCORP, INC. ("Meridian"), and
CORESTATES FINANCIAL CORP ("CoreStates").

                                   RECITALS:
                                   -------- 

     A.   Meridian.  Meridian is a corporation duly organized and existing in
          --------                                                           
good standing under the laws of the Commonwealth of Pennsylvania, with its
principal executive offices located in Reading, Pennsylvania.  Meridian has
200,000,000 authorized shares of common stock, each of $5.00 par value
("Meridian Common Stock"), and 25,000,000 authorized shares of preferred stock,
each of $25.00 par value, of which, as of September 30, 1995, 515,434 shares of
Meridian Common Stock were issued and held by Meridian as treasury stock and
57,822,604 shares of Meridian Common Stock were issued and outstanding.  No
shares of Meridian preferred stock are issued and outstanding.

     B.   CoreStates.  CoreStates is a corporation duly organized and existing
          ----------                                                          
in good standing under the laws of the Commonwealth of Pennsylvania, with its
principal executive offices located in Philadelphia, Pennsylvania.  CoreStates
has 200,000,000 authorized shares of common stock, each of $1.00 par value
("CoreStates Common Stock"), and 10,000,000 authorized shares of preferred
stock, no par value, of which, as of September 30, 1995, 138,909,597 shares of
CoreStates Common Stock and no shares of CoreStates preferred stock were issued
and outstanding.

     C.   Stock Option Agreements.  As a condition and inducement to
          -----------------------                                   
CoreStates's willingness to enter into this Plan, concurrently with the
execution and delivery of this Plan, Meridian has executed and delivered a Stock
Option Agreement with CoreStates (the "Meridian Stock Option Agreement") in
substantially the form attached hereto as Exhibit A, pursuant to which Meridian
is granting to CoreStates an option to purchase, under certain circumstances,
shares of Meridian Common Stock.  As a condition and inducement to Meridian's
willingness to enter into this Plan, concurrently with the execution and
delivery of this Plan, CoreStates has executed and delivered a Stock Option
Agreement with Meridian (the "CoreStates Stock Option Agreement"; and, together
with the Meridian Stock Option Agreement, the "Stock Option Agreements") in
substantially the form attached hereto as Exhibit B, pursuant to which
CoreStates is granting to Meridian an option to purchase, under certain
circumstances, shares of CoreStates Common Stock.

     D.   Intention of the Parties.  It is the intention of the parties to this
          ------------------------                                             
Plan that the Merger (as defined in Section 1.01) shall (i) be accounted for as
a "pooling of interests" under generally accepted accounting principles and (ii)
qualify as a


                                       1
<PAGE>
 
reorganization under Section 368(a) of the Internal Revenue Code of 1986, as
amended (the "Code").

     E.   Approvals.  The Board of Directors of each of Meridian and CoreStates
          ---------                                                            
(i) has determined that this Plan and the transactions contemplated hereby are
consistent with, and in furtherance of, its respective business strategies and
(ii) has approved, at meetings of each of such Boards of Directors, this Plan.

     NOW, THEREFORE, in consideration of their mutual promises and obligations,
the parties hereto approve, adopt and make this Plan and prescribe the terms and
conditions hereof and the manner and basis of carrying it into effect, which
shall be as follows:

I.   THE MERGER; EFFECTS OF THE MERGER.
     --------------------------------- 

     1.01.  The Merger.  At the Effective Time (as defined in Section 1.02):
            ----------                                                      

          (A) The Continuing Corporation.  Meridian shall merge with and into
              --------------------------                                     
CoreStates (the "Merger"), the separate existence of Meridian shall cease and
CoreStates shall survive and continue to exist as a Pennsylvania corporation
(CoreStates sometimes being referred to herein as the "Continuing Corporation"
after the Effective Time).

          (B) Effective Time of the Merger.  Subject to the provisions of this
              ----------------------------                                    
Plan, articles of merger (the "Articles of Merger") shall be duly prepared,
executed and acknowledged by CoreStates and Meridian, and thereafter filed with
the office of the Secretary of the Commonwealth of Pennsylvania, as provided in
the Pennsylvania Business Corporation Law (the "BCL"), on the Closing Date (as
defined in Section 1.01(C)).  The Merger shall become effective upon the filing
of the Articles of Merger with the Secretary of the Commonwealth of Pennsylvania
or at such time thereafter as is provided in the Articles of Merger (the
"Effective Time"), in accordance with (S)1928 of the Pennsylvania Business
Corporation Law (the "BCL").  The Merger shall have the effects prescribed in
(S)1929 of the BCL.

          (C) Closing.  The closing of the Merger (the "Closing") will take
              -------                                                      
place at 10:00 a.m. on a date to be specified by the parties, which shall be the
first day which is at least two business days after satisfaction or waiver
(subject to applicable law) of the conditions (excluding conditions that, by
their terms, cannot be satisfied until the Closing Date) set forth in Article VI
(the "Closing Date"), unless another time or date is agreed to in writing by the
parties hereto.  The Closing shall be held at such location as is agreed to in
writing by the parties hereto.

          (D) Articles of Incorporation and By-laws.  The articles of
              -------------------------------------                  
incorporation and by-laws of the Continuing


                                       2
<PAGE>
 
Corporation shall be those of CoreStates, as in effect immediately prior to the
Effective Time and as further amended as of the Effective Time as contemplated
by this Plan.

II.  CONSIDERATION.
     ------------- 

     2.01.  Merger Consideration.  Subject to the provisions of this Plan, at
            --------------------                                             
the Effective Time, automatically by virtue of the Merger and without any action
on the part of any shareholder:

          (A) Outstanding CoreStates Common Stock.  Each share of CoreStates
              -----------------------------------                           
Common Stock issued and outstanding immediately prior to the Effective Time
shall be unchanged and shall remain issued and outstanding common stock of the
Continuing Corporation.  Shares of CoreStates Common Stock owned by Meridian
(other than shares held in trust, managed, custodial or nominee accounts and the
like or held by mutual funds for which a subsidiary of Meridian acts as
investment advisor, that in any such case are beneficially owned by third
parties (any such shares, "trust account shares") and shares acquired in respect
of debts previously contracted (any such shares, "DPC shares")) shall become
treasury stock of CoreStates.

          (B) Outstanding Meridian Common Stock.  Each share (excluding shares
              ---------------------------------                               
held by Meridian or any of its wholly-owned subsidiaries (as defined in Section
8.08) ("Treasury Shares") or by CoreStates or any of its wholly-owned
subsidiaries, in each case other than trust account shares or DPC shares) of
Meridian Common Stock (including each attached right (a "Meridian Right") issued
pursuant to the Rights Agreement, dated as of July 25, 1989 (as amended, the
"Meridian Rights Agreement"), between Meridian and Meridian Bank, as Rights
Agent) issued and outstanding immediately prior to the Effective Time shall
become and be converted into the right to receive 1.225 shares (subject to
possible adjustment as set forth in Sections 2.05 and 7.01(D), the "Exchange
Ratio") of CoreStates Common Stock.  All shares of Meridian Common Stock owned
by Meridian as Treasury Shares and all shares of Meridian Common Stock owned by
CoreStates or a wholly-owned subsidiary of CoreStates or of Meridian (other than
trust account shares or DPC shares) shall be cancelled and retired and shall
cease to exist and no shares of CoreStates or other consideration shall be
deliverable in exchange therefor.

     2.02.  Shareholder Rights; Stock Transfers.  At the Effective Time, holders
            -----------------------------------                                 
of Meridian Common Stock shall cease to be, and shall have no rights as,
shareholders of Meridian, other than to receive the consideration provided under
this Article II.  After the Effective Time, there shall be no transfers on the
stock transfer books of Meridian or the Continuing Corporation of shares of
Meridian Common Stock.

     2.03.  Fractional Shares.  Notwithstanding any other provision hereof, no
            -----------------                                                 
fractional shares of CoreStates Common Stock and no certificates or scrip
therefor, or other evidence of


                                       3
<PAGE>
 
ownership thereof, will be issued in the Merger; instead, CoreStates shall pay
to each holder of Meridian Common Stock who would otherwise be entitled to a
fractional share an amount in cash determined by multiplying such fraction by
the average of the last sale prices of CoreStates Common Stock, as reported by
the New York Stock Exchange (the "NYSE") Composite Transactions reporting system
(as reported in The Wall Street Journal or, if not reported therein, in another
authoritative source), for the five NYSE trading days immediately preceding the
Effective Date.

     2.04.  Exchange Procedures.
            ------------------- 

          (A) As of the Effective Time, CoreStates shall, or shall cause to be
deposited, with First Chicago Trust Company of New York (or another bank
selected by CoreStates and reasonably acceptable to Meridian) (the "Exchange
Agent"), for the benefit of the holders of shares of Meridian Common Stock, for
exchange in accordance with Sections 2.01 and 2.03, certificates representing
the shares of CoreStates Common Stock and the cash in lieu of fractional shares
(such cash and certificates for shares of CoreStates Common Stock, together with
any dividends or distributions with respect thereto, being hereinafter referred
to as the "Exchange Fund") to be issued in exchange for outstanding shares of
Meridian Common Stock.

          (B) Promptly after the Effective Time, CoreStates shall cause the
Exchange Agent to mail to each holder of record of a certificate or certificates
previously representing shares of Meridian Common Stock (each a "Certificate")
the following:  (i) a letter of transmittal specifying that delivery shall be
effected, and risk of loss and title to the Certificates shall pass, only upon
delivery of the Certificates to the Exchange Agent, which shall be in a form and
contain any other provisions as are mutually agreeable to CoreStates and
Meridian; and (ii) instructions for use in effecting the surrender of the
Certificates in exchange for certificates representing shares of CoreStates
Common Stock and cash in lieu of fractional shares.  Upon the proper surrender
of a Certificate to the Exchange Agent, together with a properly completed and
duly executed letter of transmittal, the holder of such Certificate shall be
entitled to receive in exchange therefor (x) a certificate representing that
number of whole shares of CoreStates Common Stock and (y) a check representing
the amount of cash in lieu of any fractional shares and unpaid dividends and
distributions, if any, which such holder has the right to receive in respect of
the Certificate surrendered pursuant to the provisions of Sections 2.01 and
2.03, and the Certificate so surrendered shall forthwith be canceled.  No
interest will be paid or accrued on the cash in lieu of fractional shares and
unpaid dividends and distributions, if any, payable to holders of Certificates.
In the event of a transfer of ownership of any shares of Meridian Common Stock
not registered in the transfer records of Meridian, a certificate representing
the proper number of shares of CoreStates Common Stock, together with a check
for the cash to be paid in lieu of


                                       4
<PAGE>
 
fractional shares, may be issued to the transferee if the Certificate
representing such Meridian Common Stock is presented to the Exchange Agent,
accompanied by documents sufficient (1) to evidence and effect such transfer and
(2) to evidence that all applicable stock transfer taxes have been paid.

          (C) Whenever a dividend or other distribution is declared by
CoreStates on the CoreStates 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 issuable pursuant to this Plan; provided that after
the 30th day following the Effective Date no dividend or other distribution
declared or made on the CoreStates Common Stock shall be paid to the holder of
any unsurrendered Certificate with respect to the shares of CoreStates Common
Stock represented thereby until the holder of such Certificate shall duly
surrender such Certificate in accordance with this Section 2.04.  Following such
surrender of any such Certificate, there shall be paid to the holder of the
certificates representing whole shares of CoreStates Common Stock issued in
exchange therefor, without interest, (i) at the time of such surrender, the
amount of dividends or other distributions having a record date after the
Effective Time theretofore payable with respect to such whole shares of
CoreStates Common Stock and not yet paid and (ii) at the appropriate payment
date, the amount of dividends or other distributions having (x) a record date
after the Effective Time but prior to surrender and (y) a payment date
subsequent to surrender payable with respect to such whole shares of CoreStates
Common Stock.

          (D) Any portion of the Exchange Fund (including the proceeds of any
investments thereof and any CoreStates Common Stock) that remains unclaimed by
the shareholders of Meridian for six months after the Effective Time shall be
repaid to CoreStates.  Any shareholders of Meridian who have not theretofore
complied with this Section 2.04 shall thereafter look only to CoreStates for
payment of their shares of CoreStates Common Stock, cash in lieu of fractional
shares and any unpaid dividends and distributions on the CoreStates Common Stock
deliverable in respect of each share of Meridian Common Stock such shareholder
holds as determined pursuant to this Plan, in each case, without any interest
thereon.  If outstanding certificates for shares of the Meridian Common Stock
are not surrendered or the payment for them not claimed prior to the date on
which such payments would otherwise escheat to or become the property of any
governmental unit or agency, the unclaimed items shall, to the extent permitted
by abandoned property and any other applicable law, become the property of
CoreStates (and to the extent not in its possession shall be paid over to it),
free and clear of all claims or interest of any person previously entitled to
such claims.  Notwithstanding the foregoing, none of CoreStates, the Exchange
Agent or any other person shall be liable to any former holder of the Meridian
Common Stock for any amount delivered to a public body or official pursuant to
applicable abandoned property, escheat or similar laws.


                                       5
<PAGE>
 
          (E) In the event any Certificate shall have been lost, stolen or
destroyed, upon the making of an affidavit of that fact by the person claiming
such Certificate to be lost, stolen or destroyed and, if required by CoreStates,
the posting by such person of a bond in such amount as CoreStates may direct as
indemnity against any claim that may be made against it with respect to such
Certificate, the Exchange Agent will issue in exchange for such lost, stolen or
destroyed Certificate the shares of CoreStates Common Stock and cash in lieu of
fractional shares (and unpaid dividends and distributions thereon) deliverable
in respect thereof pursuant to this Plan.

          (F) Notwithstanding anything in this Plan to the contrary, for a
period of 90 days after the Effective Date holders of Certificates shall be
entitled to vote the number of whole shares of CoreStates Common Stock into
which their Meridian Common Stock was converted in the Merger as holders of such
shares of CoreStates Common Stock notwithstanding that such Certificates shall
not have been exchanged.

     2.05.  Anti-Dilution Provisions.  In the event CoreStates changes (or
            ------------------------                                      
establishes a record date for changing) the number of shares of CoreStates
Common Stock issued and outstanding prior to the Effective Date as a result of a
stock split, stock dividend, recapitalization or similar transaction with
respect to the outstanding CoreStates Common Stock and the record date therefor
shall be prior to the Effective Date, the Exchange Ratio shall be
proportionately adjusted.

     2.06.  Treasury Shares.  Each of the shares of Meridian Common Stock held
            ---------------                                                   
as Treasury Shares immediately prior to the Effective Time shall be canceled and
retired at the Effective Time and no consideration shall be issued in exchange
therefor.

     2.07.  Options.  Notwithstanding any provision to the contrary in
            -------                                                   
Meridian's stock option plan, from and after the Effective Time, all stock
options to purchase shares of Meridian Common Stock (each, a "Meridian Stock
Option"), which are then outstanding and unexercised, shall be converted into
and become options to purchase shares of CoreStates Common Stock, and CoreStates
shall assume each such Meridian Stock Option in accordance with the terms of the
plan and agreement by which it is evidenced; provided, however, that from and
after the Effective Time (i) each such Meridian Stock Option assumed by
CoreStates may be exercised solely to purchase shares of CoreStates Common
Stock, (ii) the number of shares of CoreStates Common Stock purchasable upon
exercise of such Meridian Stock Option shall be equal to the number of shares of
Meridian Common Stock that were purchasable under such Meridian Stock Option
immediately prior to the Effective Time multiplied by the Exchange Ratio and
rounding up to the nearest whole share, and (iii) the per share exercise price
under each such Meridian Stock Option shall be adjusted by dividing the per
share exercise price of each such Meridian Stock Option by the Exchange Ratio,
and


                                       6
<PAGE>
 
rounding up to the nearest cent.  The terms of each Meridian Stock Option shall,
in accordance with its terms, be subject to further adjustment as appropriate to
reflect any stock split, stock dividend, recapitalization or other similar
transaction with respect to CoreStates Common Stock on or subsequent to the
Effective Date.  It is intended that the foregoing assumption shall be effected
in a manner which is consistent with the requirements of Section 424 of the
Code, as to any Meridian Stock Option that is an "incentive stock option" (as
defined in Section 422 of the Code).

III.  ACTIONS PENDING MERGER.
      ---------------------- 

     From the date hereof until the Effective Time, except as expressly
contemplated in this Plan, (i) without the prior written consent of CoreStates
(which consent shall not be unreasonably withheld or delayed) Meridian will not,
and will cause each of its subsidiaries not to, and (ii) without the prior
written consent of Meridian (which consent shall not be unreasonably withheld or
delayed) CoreStates will not, and will cause each of its subsidiaries not to:

     3.01.  Ordinary Course.  Conduct the business of it and its subsidiaries
            ---------------                                                  
other than in the ordinary and usual course or, to the extent consistent
therewith, fail to use reasonable efforts to preserve intact their business
organizations and assets and maintain their rights, franchises and existing
relations with customers, suppliers, employees and business associates, or
knowingly take any action that would, or might reasonably be expected to (unless
such action is required by law or sound banking practice) (i) adversely affect
the ability of any party to obtain any necessary approvals of any Regulatory
Authorities (as defined in Section 4.03(I)) required for the transactions
contemplated hereby without the imposition of any burdensome condition of the
type referred to in Section 6.02 or (ii) adversely affect its ability to perform
any of its material obligations under this Plan, provided that nothing in this
Plan shall be deemed to restrict the ability of a party to exercise its rights
under the applicable Stock Option Agreement.

     3.02.  Capital Stock.  Other than (i) as Previously Disclosed in Section
            -------------                                                    
4.03(C) of its Disclosure Letter (as defined in Section 4.01), (ii) pursuant to
the exercise of stock options outstanding on the date hereof or thereafter
issued as permitted by this Section 3.02, (iii) in connection with acquisitions
of businesses permitted in Section 3.06, (iv) in the case of CoreStates,
pursuant to employee benefit plans or programs in effect on the date of this
Plan or as permitted by Section 4.03(P)(4), or (v) under the relevant Stock
Option Agreement, (x) issue, sell or otherwise permit to become outstanding any
additional shares of capital stock, any stock appreciation rights, or any Rights
(as defined in Section 8.08), (y) enter into any agreement with respect to the
foregoing, or (z) permit additional shares of capital stock to become subject to
new


                                       7
<PAGE>
 
grants of employee stock options, stock appreciation rights, or similar stock-
based employee rights prior to the Effective Time.

     3.03.  Dividends; Changes in Stock.  (1) Make, declare or pay any dividend
            ---------------------------                                        
on or in respect of, or declare or make any distribution on any shares of its
capital stock, except (A) Meridian may continue the declaration and payment of
regular quarterly cash dividends of $.37 per share of Meridian Common Stock, and
CoreStates may continue the declaration and payment of regular quarterly cash
dividends not in excess of $.34 per share of CoreStates Common Stock (provided,
however, that commencing with the first dividend paid in 1996, CoreStates may
increase the amount of regular quarterly cash dividends per share, and in such
case the limit on cash dividends payable by Meridian on Meridian Common Stock
shall increase by an amount proportionate to the increase in cash dividends
actually paid or payable by CoreStates), in each case with usual record and
payment dates for such dividends in accordance with such parties' past dividend
practice, and (B) for dividends by a wholly-owned subsidiary of such party, and
(2) except as Previously Disclosed in Section 3.03 of its Disclosure Letter,
directly or indirectly combine, redeem, reclassify, purchase or otherwise
acquire, any shares of its capital stock (other than acquisition of trust
account shares or DPC shares in the ordinary course of business).

     3.04.  Compensation; Employment Agreements; Etc.  In the case of Meridian
            -----------------------------------------                         
and its subsidiaries, except as permitted by Section 5.13, enter into or amend
any written employment, severance or similar agreements or arrangements with any
of its directors, officers or employees, or grant any salary or wage increase or
increase any employee benefit (including incentive or bonus payments), except
for (i) normal individual increases in compensation to employees in the ordinary
course of business consistent with past practice (including taking into account
deferred increases) or (ii) other changes as may be required by law or to
satisfy contractual obligations existing as of the date hereof consistent with
past practice, which to the extent practicable have been Previously Disclosed in
Section 3.04 of its Disclosure Letter.

     3.05.  Benefit Plans.  In the case of Meridian and its subsidiaries, enter
            -------------                                                      
into or modify (except as may be required by applicable law or to satisfy
contractual obligations existing as of the date hereof, which have been
Previously Disclosed in Section 3.05 of its Disclosure Letter) any pension,
retirement, stock option, stock purchase, savings, profit sharing, deferred
compensation, consulting, bonus, group insurance or other employee benefit,
incentive or welfare contract, plan or arrangement, or any trust agreement
related thereto, in respect of any of its directors, officers or other
employees, including without limitation taking any action that accelerates the
vesting or exercise of any benefits payable thereunder.



                                       8
<PAGE>
 
     3.06.  Acquisitions and Dispositions.  Except as Previously Disclosed in
            -----------------------------                                    
Section 3.06 of its Disclosure Letter and except for dispositions and
acquisitions of assets in the ordinary and usual course of business consistent
with past practice, dispose of or discontinue any portion of its assets,
business or properties, which is material to it and its subsidiaries taken as a
whole, or merge or consolidate with, or acquire (other than by way of
foreclosures or acquisitions of control in a bona fide fiduciary capacity or in
satisfaction of debts previously contracted in good faith, in each case in the
ordinary and usual course of business consistent with past practice) all or any
portion of, the business or property of any other entity (any of the foregoing,
a "Business Combination Transaction"), except that (i) Meridian may complete its
pending Business Combination Transaction with United Counties Bancorporation in
accordance with the terms of the Agreement and Plan of Merger dated May 23,
1995, and (ii) CoreStates may enter into an agreement or agreements for, and may
consummate, Business Combination Transactions in which the aggregate purchase
price or prices paid by CoreStates and/or its subsidiaries does not exceed $1.0
billion or the aggregate number of shares of CoreStates Common Stock issuable
does not exceed 20% of the number of such shares outstanding on September 30,
1995 (the "20% Limit").  Notwithstanding the foregoing, with the prior consent
of a majority of the Meridian Board of Directors, CoreStates may enter into an
agreement or agreements for Business Combination Transactions in which the
aggregate purchase price or prices paid exceeds $1.0 billion or includes shares
of CoreStates Common Stock in excess of the 20% Limit.

     3.07.  Amendment.  Amend its articles of incorporation or by-laws (or
            ---------                                                     
similar constitutive documents) (except that CoreStates may amend its Articles
of Incorporation to increase its authorized Common Stock from 200,000,000 shares
to a greater amount at least sufficient to consummate the Merger) or, except as
contemplated in Section 4.03(P)(2), the Meridian Rights Agreement, redeem the
Meridian Rights, or adopt any plan or arrangement similar to or as a substitute
for the Meridian Rights Agreement except as otherwise permitted by Section
4.03(P)(4).

     3.08.  Accounting Methods.  Implement or adopt any change in its accounting
            ------------------                                                  
principles, practices or methods, other than as may be required by generally
accepted accounting principles.

     3.09.  Adverse Actions.  (1) Knowingly take any action that would, or is
            ---------------                                                  
reasonably likely to, prevent or impede the Merger from qualifying (i) for
pooling-of-interests accounting treatment or (ii) as a reorganization within the
meaning of Section 368(a) of the Code; or (2) knowingly take any action that is
intended or is reasonably likely to result in (w) any of its representations and
warranties set forth in this Plan being or becoming untrue in any material
respect at any time prior to the Effective Time, (x) any of the conditions to
the Merger set forth in Article VI not being satisfied, (y) a material violation
of any provision of


                                       9
<PAGE>
 
either Stock Option Agreement, or (z) a material violation of any provision of
this Plan except, in every case, as may be required by applicable law; provided,
however, that nothing contained in this Agreement shall limit the ability of
Meridian or CoreStates to exercise its rights under either Stock Option
Agreement.

     3.10.  Indebtedness.  No party shall, or shall permit any of its
            ------------                                             
subsidiaries to, incur any long-term indebtedness for borrowed money or
guarantee any such long-term indebtedness or issue or sell any long-term debt
securities or warrants or rights to acquire any long-term debt securities of
such party or any of its subsidiaries or guarantee any long-term debt securities
of such party or any of its subsidiaries or guarantee any long-term debt
securities of others other than (i) in replacement for existing or maturing
debt, (ii) indebtedness of any subsidiary of a party to such party or another
subsidiary of such party or (iii) in the ordinary course of business consistent
with prior practice.

     3.11.  Agreements.  Agree or commit to do anything prohibited by Sections
            ----------                                                        
3.01 through 3.10.

IV.  REPRESENTATIONS AND WARRANTIES.
     ------------------------------ 

     4.01.  Disclosure Letters.  Concurrently herewith, CoreStates has delivered
            ------------------                                                  
to Meridian and Meridian has delivered to CoreStates a letter (as the case may
be, its "Disclosure Letter") setting forth certain items of disclosure with
respect to the representations and warranties set forth below.  The mere
inclusion of an item in a Disclosure Letter shall not be deemed an admission by
a party that such item represents a material exception or fact, event or
circumstance or that such item is reasonably likely to result in a Material
Adverse Effect (as defined in Section 8.08).

     4.02.  Standard.  No representation or warranty of CoreStates or Meridian
            --------                                                          
contained in Section 4.03 (other than the representations and warranties
contained in (i) Sections 4.03(A) (with respect to the facts set forth in
Recitals A and B), (C), and (U)(ii), which shall be true and correct (except for
inaccuracies which are de minimis in amount) and (ii) Sections 4.03(D)(1)(i)-
(iv), (E), (F), M(1)-(2), (P), (Q) and (U)(i) which shall be true and correct in
all material respects) shall be deemed untrue or incorrect, and no party hereto
shall be deemed to have breached a representation or warranty, as a consequence
of the existence or absence of any fact, circumstance or event if such fact,
circumstance or event, individually or taken together with all other facts,
circumstances or events inconsistent with any paragraph of Section 4.03 is not
reasonably likely to have a Material Adverse Effect.

     4.03.  Representations and Warranties.  Subject to Sections 4.01 and 4.02,
            ------------------------------                                     
Meridian hereby represents and warrants


                                      10
<PAGE>
 
to CoreStates, and CoreStates hereby represents and warrants to Meridian, as
follows:

          (A) Recitals.  In the case of the representations and warranties of
              --------                                                       
Meridian, the facts set forth in Recitals A, C, D and E of this Plan with
respect to it are true and correct.  In the case of the representations and
warranties of CoreStates, the facts set forth in Recitals B, C, D and E of this
Plan with respect to it are true and correct.

          (B) Organization, Standing, and Authority.  It is duly qualified to do
              -------------------------------------                             
business and is in good standing in the states of the United States and foreign
jurisdictions where its ownership or leasing of property or the conduct of its
business requires it to be so qualified.  It has in effect all federal, state,
local, and foreign governmental authorizations, licenses and approvals necessary
for it to own or lease its properties and assets and to carry on its business as
it is now conducted.  The Articles of Incorporation and by-laws of it, copies of
which were furnished to (i) CoreStates, in the case of Meridian, and (ii)
Meridian, in the case of CoreStates, are true, correct and complete copies of
such documents as in effect on the date of this Agreement.

          (C)  Shares.
               ------ 

               (1) The outstanding shares of its capital stock have been duly
authorized and are validly issued and outstanding, fully paid and nonassessable,
and subject to no preemptive rights (and were not issued in violation of any
preemptive rights).  Except as Previously Disclosed in Section 4.03(C) of its
Disclosure Letter or, in the case of CoreStates, as may be permitted by Sections
3.06 or 4.03(P)(4), there are no shares of its capital stock authorized and
reserved for issuance, it does not have any Rights issued or outstanding with
respect to its capital stock, and it does not have any commitment to authorize,
issue, sell, repurchase or redeem any such shares or Rights, except pursuant to
this Plan, the relevant Stock Option Agreement and, in the case of Meridian, the
Meridian Rights Agreement, and the pending Business Combination Transaction with
United Counties Bancorporation pursuant to the Agreement and Plan of Merger
dated May 23, 1995.  Between September 30, 1995 and the date of this Plan, it
has issued no shares of its capital stock or Rights except pursuant to
commitments Previously Disclosed in Section 4.03(C) of its Disclosure Letter.

               (2) In the case of the representations and warranties of
Meridian, the number of shares of Meridian Common Stock which are issuable upon
exercise of Meridian Stock Options granted (and the related exercise price), or
to be granted prior to the Effective Date as permitted by this Plan, are
Previously Disclosed in Section 4.03(C) of Meridian's Disclosure Letter.

               (3) In the case of the representations and warranties of
CoreStates, the shares of CoreStates Common Stock


                                      11
<PAGE>
 
to be issued in exchange for shares of Meridian Common Stock in the Merger, when
issued in accordance with the terms of this Plan will be duly authorized,
validly issued, fully paid and nonassessable.

          (D)  Subsidiaries.
               ------------ 

               (1) (i) It has Previously Disclosed in Section 4.03(D) of its
Disclosure Letter a list of all its subsidiaries as of the date of this Plan
together with the state or other jurisdiction of incorporation for each such
subsidiary and the percentage of the issued and outstanding voting securities
owned by it, (ii) no equity securities of any of its significant subsidiaries
(as defined in Section 8.08) are or may become required to be issued (other than
to it or a subsidiary of it) by reason of any Rights, (iii) it owns 100% of the
issued and outstanding voting securities of each significant subsidiary (except
for directors' qualifying shares, if any), (iv) there are no contracts,
commitments, understandings or arrangements by which any of its significant
subsidiaries is or may be bound to sell or otherwise transfer any shares of the
capital stock of any such significant subsidiary (other than to it or a
subsidiary of it), (v) there are no contracts, commitments, understandings or
arrangements relating to its rights to vote or to dispose of shares of any
significant subsidiary (other than to it or a subsidiary of it), and (vi) all of
the shares of capital stock of each such significant subsidiary held by it or
its subsidiaries are fully paid and (except pursuant to 12 U.S.C. Section 55 or
equivalent state statutes in the case of banking subsidiaries) nonassessable and
are owned by it or its subsidiaries free and clear of any charge, mortgage,
pledge, security interest, restriction, claim, lien or encumbrance ("Liens").

               (2) In the case of the representations and warranties of
Meridian, except as Previously Disclosed in Section 4.03(D) of its Disclosure
Letter, it does not own (other than trust account shares and DPC shares)
beneficially, directly or indirectly, any shares of any equity securities or
similar interests of any person, or any interest in a partnership or joint
venture of any kind.

               (3) Each of its significant subsidiaries has been duly organized
and is validly existing in good standing under the laws of the jurisdiction in
which it is incorporated or organized, is duly qualified to do business and in
good standing in the jurisdictions where its ownership or leasing of property or
the conduct of its business requires it to be so qualified, and has in effect
all federal, state, local and foreign governmental authorizations, licenses and
approvals necessary for it to own or lease its properties and assets and to
carry out its business as it is now conducted.

          (E) Corporate Power.  It and each of its significant subsidiaries has
              ---------------                                                  
the corporate power and authority to carry on


                                      12
<PAGE>
 
its business as it is now being conducted and to own all its properties and
assets; and it has the corporate power and authority to execute, deliver and
perform its obligations under this Plan and the Stock Option Agreements.

          (F) Corporate Authority.  Subject, in the case of this Plan, to
              -------------------                                        
receipt of the requisite approval of its shareholders referred to in Section
6.01, the execution and delivery of this Plan and the Stock Option Agreements
and the consummation of the transactions contemplated hereby and thereby have
been authorized by all necessary corporate action on its part, and this Plan and
the Stock Option Agreements have been duly executed and delivered by it, and
each is a valid and binding agreement of it, enforceable in accordance with its
terms (except as may be limited by applicable bankruptcy, insolvency,
reorganization, moratorium, fraudulent transfer and similar laws of general
applicability relating to or affecting creditors rights or by general equity
principles).

          (G) No Defaults.  Except as Previously Disclosed in Section 4.03(G) of
              -----------                                                       
its Disclosure Letter, subject to receipt of the Regulatory Approvals, and
expiration of the waiting periods, referred to in Section 6.02 and the required
filings under federal and state securities laws, the execution, delivery and
performance of this Plan and the Stock Option Agreements and the completion of
the transactions contemplated hereby and thereby by it, do not and will not (i)
constitute a breach or violation of, or a default under, any law, rule or
regulation or any judgment, decree, order, governmental permit or license, or
agreement, indenture or instrument of it or of any of its significant
subsidiaries or to which it or any of its significant subsidiaries or properties
is subject or bound, (ii) constitute a breach or violation of, or a default
under, its Articles of Incorporation or by-laws, or (iii) require any consent or
approval under any such law, rule, regulation, judgment, decree, order,
governmental permit or license agreement, indenture or instrument.

          (H) Financial Reports and SEC Documents.  Its Annual Report on Form
              -----------------------------------                            
10-K for the fiscal year ended December 31, 1994, and all other reports,
registration statements, definitive proxy statements or information statements
filed or to be filed by it or any of its subsidiaries subsequent to December 31,
1994 under the Securities Act of 1933, as amended (together with the rules and
regulations thereunder, the "Securities Act"), or under Sections 13(a), 13(c),
14 and 15(d) of the Securities Exchange Act of 1934, as amended (together with
the rules and regulations thereunder, the "Exchange Act"), in the form filed, or
to be filed (collectively, its "SEC Documents"), with the Securities and
Exchange Commission (the "SEC") (i) complied or will comply as of the date of
filing thereof in all material respects as to form with the applicable
requirements under the Exchange Act and (ii) did not and will not contain as of
the date of filing thereof any untrue statement of a material fact or omit to
state


                                      13
<PAGE>
 
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; and each of the balance sheets in or incorporated by
reference into any such SEC Document (including the related notes and schedules
thereto) fairly presents and will fairly present the financial position of the
entity or entities to which it relates as of its date and each of the statements
of income and changes in shareholders' equity and cash flows or equivalent
statements in such report and documents (including any related notes and
schedules thereto) fairly presents and will fairly present the results of
operations, changes in shareholders' equity and changes in cash flows, as the
case may be, of the entity or entities to which it relates for the periods set
forth therein, in each case in accordance with generally accepted accounting
principles consistently applied during the periods involved, except in each case
as may be noted therein, subject to normal and recurring year-end audit
adjustments in the case of unaudited statements.  All material agreements,
contracts and other documents required to be filed by it as exhibits to any SEC
Document have been so filed.

          (I) Litigation; Regulatory Action.  Except as Previously Disclosed in
              -----------------------------                                    
Section 4.03(I) of its Disclosure Letter:

               (1) no litigation or proceeding before any court or governmental
agency is pending against it or any of its subsidiaries and, to the best of its
knowledge, no such litigation, proceeding or controversy has been threatened;

               (2) neither it nor any of its subsidiaries or properties is a
party to or is subject to any order, decree, agreement, memorandum of
understanding or similar arrangement with, or a commitment letter or similar
submission to, or has adopted any board resolution at the request of, any
federal or state governmental agency or authority charged with the supervision
or regulation of financial institutions or their holding companies or the
issuance of securities or engaged in the insurance of deposits (including,
without limitation, the Office of the Comptroller of the Currency, the Board of
Governors of the Federal Reserve System and the Federal Deposit Insurance
Corporation) or the supervision or regulation of it or any of its subsidiaries
(collectively, the "Regulatory Authorities"); and

               (3) neither it nor any of its subsidiaries has been advised by
any Regulatory Authority that such Regulatory Authority is contemplating issuing
or requesting (or is considering the appropriateness of issuing or requesting)
any such order, decree, agreement, memorandum of understanding, commitment
letter or similar submission or any such resolutions.

          (J) Compliance with Laws.  Except as Previously Disclosed in Section
              --------------------                                            
4.03(J) of its Disclosure Letter, it and each of its subsidiaries:


                                      14
<PAGE>
 
               (1) is in compliance, in the conduct of its business, with all
applicable federal, state, local and foreign statutes, laws, regulations,
ordinances, rules, judgments, orders or decrees applicable thereto or to the
employees conducting such businesses, including, without limitation, the Equal
Credit Opportunity Act, the Fair Housing Act, the Community Reinvestment Act,
the Home Mortgage Disclosure Act and all other applicable fair lending laws and
other laws relating to discriminatory business practices;

               (2) has all permits, licenses, authorizations, orders and
approvals of, and has made all filings, applications and registrations with, all
Regulatory Authorities that are required in order to permit them to conduct
their businesses substantially as presently conducted; all such permits,
licenses, certificates of authority, orders and approvals are in full force and
effect and, to the best of its knowledge, no suspension or cancellation of any
of them is threatened; and

               (3) has received, since December 31, 1994, no notification or
communication from any Regulatory Authority (i) asserting that it or any of its
subsidiaries is not in compliance with any of the statutes, regulations, or
ordinances which such Regulatory Authority enforces or (ii) threatening to
revoke any license, franchise, permit, or governmental authorization or (iii)
threatening or contemplating revocation or limitation of, or which would have
the effect of revoking or limiting, federal deposit insurance (nor, to its
knowledge, do any grounds for any of the foregoing exist).

          (K)  Defaults; Properties.
               -------------------- 

               (1) Except as Previously Disclosed in Section 4.03(K) of its
Disclosure Letter, neither it nor any of its subsidiaries is in default under
any contract, agreement, commitment, arrangement, lease, insurance policy, or
other instrument to which it is a party, by which its respective assets,
business, or operations may be bound or affected, or under which it or its
respective assets, business, or operations receives benefits, and there has not
occurred any event that, with the lapse of time or the giving of notice or both,
would constitute such a default.

               (2) Except as disclosed or reserved against in its SEC Documents,
it and its subsidiaries have good and marketable title, free and clear of all
Liens (other than Liens for current taxes not yet delinquent or pledges to
secure deposits) to all of the properties and assets, tangible or intangible,
reflected in its SEC Documents as being owned by it or its subsidiaries as of
the dates thereof. To its knowledge, all buildings and all fixtures, equipment
and other property and assets are held under valid leases or subleases by it or
its subsidiaries enforceable in accordance with their respective terms (except
as may be limited by applicable bankruptcy,


                                      15
<PAGE>
 
insolvency, reorganization, moratorium, fraudulent transfer and similar laws of
general applicability affecting creditors' rights or by general equity
principles).

          (L) No Brokers.  All negotiations relative to this Plan and the
              ----------                                                 
transactions contemplated hereby have been carried on by it directly with the
other party hereto and no action has been taken by it that would give rise to
any valid claim against the other party hereto for a brokerage commission,
finder's fee or other like payment, other than in the case of Meridian, a fee to
be paid to Goldman, Sachs & Co., Morgan Stanley & Co., Incorporated and Lehman
Brothers Inc., and, in the case of CoreStates, a fee to be paid to J.P. Morgan &
Co. Incorporated and Keefe Bruyette & Woods, Inc., which, in each case, has been
previously disclosed to the other party.

          (M)  Employee Benefit Plans.
               ---------------------- 

               In the case of the representations and warranties of Meridian:

               (1) Section 4.03(M) of Meridian's Disclosure Letter contains a
complete list of all bonus, vacation, deferred compensation, pension,
retirement, profit-sharing, thrift, savings, employee stock ownership, stock
bonus, stock purchase, restricted stock and stock option plans, all employment
or severance contracts, all medical, dental, disability, health and life
insurance plans, all other employee benefit and fringe benefit plans, contracts
or arrangements and any applicable "change of control" or similar provisions in
any plan, contract or arrangement maintained or contributed to by it or any of
its subsidiaries for the benefit of officers, former officers, employees, former
employees, directors, former directors, or the beneficiaries of any of the
foregoing ("Compensation and Benefit Plans").

               (2) True and complete copies of its Compensation and Benefit
Plans, including, but not limited to, any trust instruments and/or insurance
contracts, if any, forming a part thereof, and all amendments thereto have been
supplied to the other party.

               (3) Each of its Compensation and Benefit Plans has been
administered in compliance with the terms thereof. All "employee benefit plans"
within the meaning of Section 3(3) of the Employee Retirement Income Security
Act of 1974, as amended ("ERISA"), other than "multiemployer plans" within the
meaning of Section 3(37) of ERISA ("Multiemployer Plans"), covering employees or
former employees of it and its subsidiaries (its "Plans"), to the extent subject
to ERISA, are in compliance in all material respects with ERISA, the Code, the
Age Discrimination in Employment Act and other applicable laws. Each Plan of it
or its subsidiaries which is an "employee pension benefit plan" within the
meaning of Section 3(2) of ERISA 


                                      16
<PAGE>
 
("Pension Plan") and which is intended to be qualified under Section 401(a) of
the Code has received (or has applied for) a favorable determination letter from
the Internal Revenue Service, and it is not aware of any circumstances
reasonably likely to result in the revocation or denial of any such favorable
determination letter.  Except as Previously Disclosed in Section 4.03(M) of its
Disclosure Letter, there is no pending or, to its knowledge, threatened
litigation or governmental audit, examination or investigation relating to the
Plans.  Neither it nor any of its subsidiaries has engaged in a transaction with
respect to any Plan that, assuming the taxable period of such transaction
expired as of the date hereof, could subject it or any of its subsidiaries to a
tax or penalty imposed by either Section 4975 of the Code or Section 502(i) of
ERISA.

               (4) No liability under Subtitle C or D of Title IV of ERISA has
been or is expected to be incurred by it or any of its subsidiaries with respect
to any ongoing, frozen or terminated "single-employer plan," within the meaning
of Section 4001(a)(15) of ERISA, currently or formerly maintained by any of
them, or the single-employer plan of any entity which is considered one employer
with it under Section 4001(a)(15) of ERISA or Section 414 of the Code (an "ERISA
Affiliate"). Neither it nor any of its subsidiaries presently contributes to a
Multiemployer Plan, nor have they contributed to such a plan within the past
five calendar years. 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 Pension Plan of it or any of its
subsidiaries or by any ERISA Affiliate within the past 12 months.

               (5) All contributions, premiums and payments required to be made
under the terms of any Plan of it or any of its subsidiaries have been made.
Neither any Pension Plan of it or any of its subsidiaries nor any single
employer plan of an ERISA Affiliate of it or any of its subsidiaries has an
accumulated funding deficiency (whether or not waived) within the meaning of
Section 412 of the Code or Section 302 of ERISA. Neither it nor any of its
subsidiaries has provided, or is required to provide, security to any Pension
Plan or to any single-employer plan of an ERISA Affiliate pursuant to Section
401(a)(29) of the Code.

               (6) Under each Pension Plan of it or any of its subsidiaries
which is a single-employer plan, as of the last day of the most recent plan year
ended prior to the date hereof, the actuarially determined present value of all
benefit liabilities, within the meaning of Section 4001(a)(16) of ERISA (as
determined on the basis of the actuarial assumptions contained in the Plan's
most recent actuarial valuation), did not exceed the then current value of the
assets of such Plan, and there has been no adverse change in the financial
condition of such Plan (with respect to either assets or benefits) since the
last day of the most recent Plan year. 


                                      17
<PAGE>
 
               (7) Neither it nor any of its subsidiaries has any obligations
for retiree health and life benefits under any plan, except as Previously
Disclosed in Section 4.03(M) of its Disclosure Letter.

               (8) Each Compensation and Benefit Plan which is a group health
plan provides continuation coverage for separating employees and "qualified
beneficiaries" in accordance with the provisions of Section 4980B(f) of the
Code. Such group health plans are in compliance with Section 1862(b)(1) of the
Social Security Act.

               (9) In the case of the representations and warranties of
Meridian, except as Previously Disclosed in Section 4.03(M) of Meridian's
Disclosure Letter, neither the execution and delivery of this Plan nor the
consummation of the transactions contemplated hereby will (i) result in any
payment (including, without limitation, severance, unemployment compensation,
golden parachute or otherwise) becoming due to any director or any employee of
Meridian or any of its subsidiaries under any Compensation and Benefit Plan or
otherwise from Meridian or any of its subsidiaries, (ii) increase any benefits
otherwise payable under any Compensation and Benefit Plan or (iii) result in any
acceleration of the time of payment or vesting of any such benefit.

          (N) Labor Matters.  Neither it nor any of its subsidiaries is a party
              -------------  
to, or is bound by, any collective bargaining agreement, contract or other
agreement or understanding with a labor union or labor organization, nor is it
or any of its subsidiaries the subject of a proceeding asserting that it or any
such subsidiary has committed an unfair labor practice (within the meaning of
the National Labor Relations Act) or seeking to compel it or such subsidiary to
bargain with any labor organization as to wages and conditions of employment,
nor is there any strike or other labor dispute involving it or any of its
subsidiaries, pending or, to the best of its knowledge, threatened, nor is it
aware of any activity involving it or any of its subsidiaries' employees seeking
to certify a collective bargaining unit or engaging in any other organization
activity.

          (O) Insurance.  It and its subsidiaries have taken all requisite
              ---------                                                   
action (including without limitation the making of claims and the giving of
notices) pursuant to its directors' and officers' liability insurance policy or
policies in order to preserve all rights thereunder with respect to all matters
(other than matters arising in connection with this Plan and the transactions
contemplated hereby) that are known to it.

          (P)  Takeover Laws; Rights Plans.
               --------------------------- 

               (1) It has taken all action required to be taken by it in order
to opt out or exempt this Plan and the relevant Stock Option Agreement, and the
transactions contemplated hereby


                                      18
<PAGE>
 
and thereby, from, and this Plan and the relevant Stock Option Agreement and the
transactions contemplated hereby and thereby are exempt from, the requirements
of any "business combination," "moratorium," "disgorgement," "control share," or
other applicable antitakeover laws and regulations (collectively, "Takeover
Laws") of the Commonwealth of Pennsylvania, including Chapter 25 of the BCL.  In
the case of the representations and warranties of Meridian, the Plan has been
approved by greater than 66-2/3% of the members of the Meridian Board of
Directors, and the provisions of Articles Eleventh and Sixteenth of Meridian's
Articles of Incorporation requiring a supermajority vote do not and will not
apply to this Plan or the Meridian Stock Option Agreement, the Merger or the
transactions contemplated hereby or thereby.

               (2) In the case of the representations and warranties of
Meridian, it has (i) duly entered into an amendment to the Meridian Rights
Agreement in substantially the form of Exhibit C, and (ii) taken all other
action necessary or appropriate so that, the entering into of this Plan and the
Stock Option Agreements and the completion of the transactions contemplated
hereby and thereby (including without limitation the Merger and the exercise of
the Option (as defined in the relevant Stock Option Agreement)) do not and will
not result in the ability of any person to exercise any rights under the
Meridian Rights Agreement, or enable or require the Meridian Rights to separate
from the shares of common stock to which they are attached or to be triggered or
become exercisable.

               (3) In the case of the representations and warranties of
Meridian, no "Distribution Date," "Stock Acquisition Date" or "Triggering Event"
(as such terms are defined in the Meridian Rights Agreement) has occurred.

               (4) In the case of the representations and warranties of
CoreStates, CoreStates has not entered into any agreement of similar effect as
the Meridian Rights Agreement; provided, however, that CoreStates may enter into
an agreement of similar effect as the Meridian Rights Agreement if (i) provision
is made so that each share of CoreStates Common Stock issued in the Merger has
attached to it the same number of rights as are attached to then-outstanding
shares of CoreStates Common Stock, and (ii) CoreStates takes actions with
respect to such rights plan substantially equivalent to those specified in
paragraphs (1), (2) and (3) above.

          (Q) Vote Required.  In the case of the representations and warranties
              -------------                                                    
of Meridian, the affirmative vote of the holders of a majority of the shares of
its Common Stock present and voting at the meeting referred to in Section 5.02
is the only vote of the holders of any class or series of its capital stock
necessary to approve this Plan and the transactions contemplated hereby, and in
the case of the representations and warranties of CoreStates, the affirmative
vote of the holders of a majority of


                                      19
<PAGE>
 
the shares of its Common Stock present and voting at the meeting referred to in
Section 5.02 is the only vote of the holders of any class or series of its
capital stock necessary to approve (i) the amendment to its Articles of
Incorporation referred to in Section 3.07 and (ii) this Plan and the
transactions contemplated hereby.

          (R) Environmental Matters.  Other than as previously disclosed in
              ---------------------                                        
Section 4.03(R) of its Disclosure Letter, there are no proceedings, claims,
actions, or investigations of any kind, pending or threatened, in any court,
agency, or other government authority or in any arbitral body, arising under any
Environmental Law; there is no reasonable basis for any such proceeding, claim,
action or investigation; there are no agreements, orders, judgments, decrees,
letters or memoranda by or with any court, regulatory agency or other
governmental authority, or with any other entity, imposing any liability or
obligation; there are and have been no Materials of Environmental Concern or
other conditions at any property (whether or not owned, operated, or otherwise
used by, or the subject of a security interest on behalf of, it or any of its
subsidiaries); and there are no reasonably anticipated future events,
conditions, circumstances, practices, plans, or legal requirements that could
give rise to obligations under any Environmental Law.  "Environmental Laws"
means the statutes, rules, regulations, ordinances, codes, orders, decrees, and
any other laws (including common law) of any foreign, federal, state, local, and
any other governmental authority, regulating, relating to or imposing liability
or standards of conduct concerning pollution, or protection of human health-and-
safety or of the environment, as in effect on or prior to the date of this
Agreement.  "Materials of Environmental Concern" means any hazardous or toxic
substances, materials, wastes, pollutants, or contaminants, including without
limitation those defined or regulated as such under any Environmental Law, and
any other substance the presence of which may give rise to liability under any
Environmental Law.

          (S) Tax Reports.  Except as Previously Disclosed in Section 4.03(S) of
              -----------                                                       
its Disclosure Letter:  (i) all reports and returns with respect to Taxes (as
defined below) that are required to be filed by or with respect to it or its
subsidiaries, including without limitation consolidated federal income tax
returns of it and its subsidiaries (collectively, the "Tax Returns"), have been
timely filed, or requests for extensions have been timely filed and have not
expired, and such Tax Returns were true, complete and accurate; (ii) all taxes
(which shall include federal, state, local or foreign income, gross receipts,
windfall profits, severance, property, production, sales, use, license, excise,
franchise, employment, withholding or similar taxes imposed on the income,
properties or operations of it or its subsidiaries, together with any interest,
additions, or penalties with respect thereto and any interest in respect of such
additions or penalties, collectively the "Taxes")


                                      20
<PAGE>
 
shown to be due on such Tax Returns have been paid in full; (iii) all Taxes due
with respect to completed and settled examinations have been paid in full; (iv)
no issues have been raised by the relevant taxing authority in connection with
the examination of any of such Tax Returns; and (v) no waivers of statutes of
limitations (excluding such statutes that relate to years currently under
examination by the Internal Revenue Service) have been given by or requested
with respect to any Taxes of it or any of its subsidiaries.

          (T) Pooling; Reorganization.  As of the date hereof, it is aware of no
              -----------------------                                           
reason why the Merger will fail to qualify (i) for pooling-of-interests
accounting treatment or (ii) as a reorganization under Section 368(a) of the
Code.

          (U) No Material Adverse Effect.  Since December 31, 1994, except as
              --------------------------                                     
previously disclosed in its SEC Documents filed with the SEC on or before the
date hereof or in any Section of its Disclosure Letter, (i) it and its
subsidiaries have conducted their respective businesses in the ordinary and
usual course (excluding the incurrence of expenses related to this Plan and the
transactions contemplated hereby) and (ii) no event has occurred or circumstance
arisen that, individually or taken together with all other facts, circumstances
and events (described in any paragraph of Section 4.03 or otherwise), is
reasonably likely to have a Material Adverse Effect with respect to it.

V.   COVENANTS.
     --------- 

     Meridian hereby covenants to and agrees with CoreStates, and CoreStates
hereby covenants to and agrees with Meridian, that:

     5.01.  Reasonable Best Efforts.  Subject to the terms and conditions of
            -----------------------                                         
this Plan, it shall use its reasonable best efforts in good faith to take, or
cause to be taken, all actions, and to do, or cause to be done, all things
necessary, proper or desirable, or advisable under applicable laws, so as to
permit consummation of the Merger as promptly as reasonably practicable and to
otherwise enable consummation of the transactions contemplated hereby and shall
cooperate fully with the other party hereto to that end.  Meridian shall, and
shall cause its officers, directors and employees to cooperate with and assist
CoreStates in the formulation of a plan or plans of integration of the operation
of Meridian with those of CoreStates.

     5.02.  Shareholder Approvals.  Each of them shall take, in accordance with
            ---------------------                                              
applicable law, National Association of Securities Dealers Automated Quotation
("Nasdaq") National Market System ("NMS") rules, in the case of Meridian, and
NYSE rules, in the case of CoreStates, and its respective articles of
incorporation and by-laws, all action necessary to convene, respectively, (i) an
appropriate meeting of shareholders of CoreStates to consider and vote upon (A)
an amendment to the


                                      21
<PAGE>
 
articles of incorporation of CoreStates to increase the number of authorized
shares of CoreStates Common Stock in an amount at least sufficient to consummate
the Merger and the transactions contemplated thereby and (B) the approval of
this Plan (the "CoreStates Meeting"), and (ii) an appropriate meeting of
shareholders of Meridian to consider and vote upon the approval of this Plan
(the "Meridian Meeting"; each of the CoreStates Meeting and the Meridian
meeting, a "Meeting"), respectively, as promptly as practicable after the
Registration Statement (as defined in Section 5.03) is declared effective.  The
Board of Directors of each of CoreStates and Meridian will recommend approval of
such matters, and each of CoreStates and Meridian will take all reasonable
lawful action to solicit such approval by its respective shareholders.
Notwithstanding the foregoing, the Board of Directors of Meridian may determine
not to recommend or solicit approval of the Merger or may withdraw its
recommendation in favor of the Merger if it receives a written opinion of
counsel that recommending or soliciting approval of the Merger, or failing to
withdraw its recommendation, would constitute a breach or failure on the part of
the Meridian Board of Directors to perform the duties of their office and any
liability for such breach or failure would not be covered under Meridian's
directors' and officers' liability insurance policy.  Meridian and CoreStates
shall coordinate and cooperate with respect to the timing of such meetings and
shall use their best efforts to hold such meetings on the same day.

     5.03.  Registration Statement.
            ---------------------- 

          (A) Each of CoreStates and Meridian agrees to cooperate in the
preparation of a registration statement on Form S-4 (the "Registration
Statement") to be filed by CoreStates with the SEC in connection with the
issuance of CoreStates Common Stock in the Merger (including the joint proxy
statement and prospectus and other proxy solicitation materials of CoreStates
and Meridian constituting a part thereof (the "Joint Proxy Statement")).  Each
of Meridian and CoreStates agrees to use all reasonable efforts to cause the
Registration Statement to be declared effective under the Securities Act as
promptly as reasonably practicable after filing thereof.  CoreStates also agrees
to use all reasonable efforts to obtain all necessary state securities law or
"Blue Sky" permits and approvals required to carry out the transactions
contemplated by this Agreement.  Meridian agrees to furnish to CoreStates all
information concerning Meridian, its subsidiaries, officers, directors and
shareholders as may be reasonably requested in connection with the foregoing.

          (B) Each of Meridian and CoreStates agrees, as to itself and its
subsidiaries, that none of the information supplied or to be supplied by it for
inclusion or incorporation by reference in (i) the Registration Statement will,
at the time the Registration Statement and each amendment thereto, if any,
becomes effective under the Securities Act, contain any untrue


                                      22
<PAGE>
 
statement of a material fact or omit to state any material fact required to be
stated therein or necessary to make the statements therein not misleading, and
(ii) the Joint Proxy Statement and any amendment or supplement thereto will, at
the date of mailing to shareholders and at the times of the CoreStates Meeting
and the Meridian Meeting, contain any statement which, in the light of the
circumstances under which such statement is made, is false or misleading with
respect to any material fact, or which will omit to state any material fact
necessary in order to make the statements therein not false or misleading or
necessary to correct any statement in any earlier communication with respect to
the solicitation of any proxy for the same meeting in the Joint Proxy Statement
or any amendment or supplement thereto.  Each of Meridian and CoreStates agrees
that the Joint Proxy Statement (except, in the case of Meridian, with respect to
portions thereof prepared by CoreStates, and except, in the case of CoreStates,
with respect to portions thereof prepared by Meridian) will comply as to form in
all material respects with the requirements of the Exchange Act and the rules
and regulations of the SEC thereunder, and the Registration Statement (except,
in the case of Meridian, with respect to portions thereof prepared by
CoreStates, and except, in the case of CoreStates, with respect to portions
thereof prepared by Meridian) will comply as to form in all material respects
with the requirements of the Securities Act and the rules and regulations of the
SEC thereunder.

          (C) In the case of CoreStates, CoreStates will advise Meridian,
promptly after CoreStates receives notice thereof, of the time when the
Registration Statement has become effective or any supplement or amendment has
been filed, of the issuance of any stop order or the suspension of the
qualification of the CoreStates Common Stock for offering or sale in any
jurisdiction, of the initiation or threat of any proceeding for any such
purpose, or of any request by the SEC for the amendment or supplement of the
Registration Statement or for additional information.

     5.04.  Press Releases.  Except as otherwise required by applicable law or
            --------------                                                    
the rules of the Nasdaq NMS or NYSE, neither CoreStates nor Meridian shall, or
shall permit any of its subsidiaries to, issue or cause the publication of any
press release or other public announcement with respect to, or otherwise make
any public statement concerning, the transactions contemplated by this Plan or
the Stock Option Agreements without the consent of the other party, which
consent shall not be unreasonably withheld.

     5.05.  Access; Information.
            ------------------- 

          (A) Upon reasonable notice, it shall afford the other party and its
officers, employees, counsel, accountants and other authorized representatives,
access, during normal business hours throughout the period prior to the
Effective Date, to all of its


                                      23
<PAGE>
 
properties, books, contracts, commitments and records and, during such period,
it shall furnish promptly to it (i) a copy of each material report, schedule and
other document filed by it pursuant to the requirements of federal or state
securities or banking laws, and (ii) all other information concerning the
business, properties and personnel of it as the other may reasonably request;
and (B) it will not use any information obtained pursuant to this Section 5.05
for any purpose unrelated to the consummation of the transactions contemplated
by this Plan and, if this Plan is terminated, will hold all information and
documents obtained pursuant to this paragraph in confidence (as provided in
Section 8.06) unless and until such time as such information or documents become
publicly available other than by reason of any action or failure to act by it or
as it is advised by counsel that any such information or document is required by
law or applicable Nasdaq or NYSE rules to be disclosed.  No investigation by
either party of the business and affairs of another shall affect or be deemed to
modify or waive any representation, warranty, covenant or agreement in this
Plan, or the conditions to either party's obligation to complete the
transactions contemplated by this Plan.

     5.06.  Acquisition Proposals.  Without the prior written consent of the
            ---------------------                                           
other, neither Meridian nor CoreStates shall, and each of them shall cause its
respective subsidiaries not to, and each of them shall direct its officers,
directors and employees and bankers, financial advisors, attorneys, accountants
and other representatives ("Representatives") not to, solicit or encourage
inquiries or proposals with respect to, or engage in any negotiations
concerning, or provide any confidential information to, or have any discussions
with, any person (other than the other party hereto) relating to a Takeover
Proposal, or enter into any agreement with respect to or take any action to
endorse or recommend a Takeover Proposal.  As used herein, the term "Takeover
Proposal" shall mean any proposal for a merger, consolidation or other business
combination involving such party or such subsidiary or any of its significant
subsidiaries (other than a merger, consolidation or other business combination
in which such party is the surviving corporation), or any tender or exchange
offer or other plan, proposal or offer by any person (other than the other party
hereto) to acquire in any manner 10% or more of the shares of any class of
voting securities of, or 20% or more of the assets of, such party or any of its
significant subsidiaries, other than pursuant to the transactions contemplated
by this Plan.  Each of CoreStates and Meridian shall advise the other orally
(within one business day) and in writing (as promptly as practicable), in
reasonable detail, of any such inquiry or proposal which it or any of its
subsidiaries or any Representative may receive and if such inquiry or proposal
is in writing, then CoreStates or Meridian, as the case may be, shall deliver to
the other a copy of such inquiry or proposal as promptly as practicable after
the receipt thereof.


                                      24
<PAGE>
 
     5.07.  Affiliate Agreements.
            -------------------- 

          (A) Not later than the 15th day prior to the mailing of the Joint
Proxy Statement, CoreStates shall deliver to Meridian, and Meridian shall
deliver to CoreStates, a schedule of each person that, to the best of its
knowledge, is or is reasonably likely to be, as of the date of the relevant
Meeting, deemed to be an "affiliate" of it (each, an "Affiliate") as that term
is used in Rule 145 under the Securities Act or SEC Accounting Series Releases
130 and 135.

          (B) Each of Meridian and CoreStates shall use its respective
reasonable best efforts to cause each person who may be deemed to be an
Affiliate of Meridian or CoreStates, as the case may be, to execute and deliver
to Meridian and CoreStates on a date at least 40 days prior to the Merger an
agreement in the form attached hereto as Exhibit D or Exhibit E, respectively.

     5.08.  Certain Modifications.
            --------------------- 

          In the case of Meridian, Meridian agrees to amend its Dividend
Reinvestment Plan ("DRP") so that after the execution of this Plan, no original
issue shares or treasury shares of Meridian Common Stock will be issued under
the DRP.

     5.09.  Takeover Laws.  No party shall take any action that would cause the
            -------------                                                      
transactions contemplated by this Plan and/or the Stock Option Agreements to be
subject to requirements imposed by any Takeover Law and each of them shall take
all necessary steps within its control to exempt (or ensure the continued
exemption of) the transactions contemplated by this Plan and the Stock Option
Agreements from, or if necessary challenge the validity or applicability of, any
applicable Takeover Law, as now or hereafter in effect, including, without
limitation, applicable provisions of Chapter 25 of the BCL, other Takeover Laws
of the Commonwealth of Pennsylvania or Takeover Laws of any other State that
purport to apply to this Plan, the Stock Option Agreements or the transactions
contemplated hereby or thereby.

     5.10.  Shares Listed.  In the case of CoreStates, CoreStates shall use its
            -------------                                                      
reasonable best efforts to cause to be approved for listing, prior to the
Effective Date, on the NYSE, upon official notice of issuance, the shares of
CoreStates Common Stock to be issued to the holders of Meridian Common Stock in
the Merger.

     5.11.  Regulatory Applications.
            ----------------------- 

          (A) Each party shall promptly (i) prepare and submit applications to
the appropriate Regulatory Authorities and (ii) make all other appropriate
filings to secure all other approvals, consents and rulings, which are necessary
for it to complete the Merger.


                                      25
<PAGE>
 
          (B) Each of CoreStates and Meridian agrees to cooperate with the other
and, subject to the terms and conditions set forth in this Plan, use its
reasonable best efforts to prepare and file all necessary documentation, to
effect all necessary applications, notices, petitions, filings and other
documents, and to obtain all necessary permits, consents, orders, approvals and
authorizations of, or any exemption by, all third parties and Regulatory
Authorities necessary or advisable to complete the transactions contemplated by
this Plan, including without limitation the regulatory approvals referred to in
Section 6.02. Each of CoreStates and Meridian shall have the right to review in
advance, and to the extent practicable each will consult with the other, in each
case subject to applicable laws relating to the exchange of information, with
respect to all material written information submitted to, any third party or any
Regulatory Authorities in connection with the transactions contemplated by this
Plan.  In exercising the foregoing right, each of the parties hereto agrees to
act reasonably and as promptly as practicable.  Each party hereto agrees that it
will consult with the other party hereto with respect to the obtaining of all
material permits, consents, approvals and authorizations of all third parties
and Regulatory Authorities necessary or advisable to complete the transactions
contemplated by this Plan and each party will keep the other party apprised of
the status of material matters relating to completion of the transactions
contemplated hereby.

          (C) Each party agrees, upon request, to furnish the other party with
all information concerning itself, its subsidiaries, directors, officers and
shareholders and such other matters as may be reasonably necessary or advisable
in connection with any filing, notice or application made by or on behalf of
such other party or any of its subsidiaries to any Regulatory Authority.

     5.12.  Indemnification.
            --------------- 

          (A) For six years after the Effective Date (except as such time period
is inapplicable as described below), CoreStates shall indemnify, defend and hold
harmless the present and former directors, officers and employees of Meridian
and its subsidiaries (each, an "Indemnified Party") against all costs or
expenses (including reasonable attorneys' fees), judgments, fines, losses,
claims, damages or liabilities (collectively, "Costs") incurred in connection
with any claim, action, suit, proceeding or investigation, whether civil,
criminal, administrative or investigative, arising out of actions or omissions
occurring at or prior to the Effective Time (including, without limitation and
without regard to the six year time limit otherwise imposed by this Section
5.12(A), the transactions contemplated by this Plan and the Meridian Stock
Option Agreement) to the fullest extent that such persons are indemnified under
Meridian's articles of incorporation and by-laws as in effect on the date hereof
(and during such period


                                      26
<PAGE>
 
CoreStates shall also advance expenses (including expenses described in Section
5.12(E)) as incurred to the fullest extent permitted under Meridian's articles
of incorporation and by-laws as in effect on the date hereof, provided that the
person to whom expenses are advanced provides an undertaking to repay such
advances if it is ultimately determined that such person is not entitled to
indemnification with no bond or security to be required).  Notwithstanding the
foregoing or anything to the contrary contained elsewhere herein, CoreStates's
indemnity agreement set forth above shall be limited to cover claims only to the
extent that such claims are not paid under Meridian's directors' and officers'
liability insurance policies referred to in Section 5.12(B) (or any substitute
policy permitted by such section).

          (B) CoreStates shall maintain Meridian's existing directors' and
officers' liability insurance policy (or a policy providing comparable coverage
amounts on terms no less favorable, including CoreStates's existing policy if it
meets the foregoing standard) covering persons who are currently covered by such
insurance for a period of six years after the Effective Date; provided, however,
that in no event shall CoreStates be obligated to expend, in order to maintain
or provide insurance coverage pursuant to this Section 5.12(B), any amount per
annum in excess of 250% of the amount of the annual premiums paid as of the date
hereof by Meridian for such insurance (the "Maximum Amount").  If the amount of
the annual premiums necessary to maintain or procure such insurance coverage
exceeds the Maximum Amount, CoreStates shall use all reasonable efforts to
maintain the most advantageous policies of directors' and officers' insurance
obtainable for an annual premium equal to the Maximum Amount.  In the event that
CoreStates acts as its own insurer for all of its directors and officers with
respect to matters typically covered by a directors' and officers' liability
insurance policy, CoreStates's obligations under this Section 5.12(B) may be
satisfied by such self insurance, so long as its senior debt ratings by Standard
& Poor's Corporation and Moody's Investors Services, Inc. are not lower than
such ratings as of the date hereof.

          (C) Any Indemnified Party wishing to claim indemnification under
Section 5.12(A), upon learning of any claim, action, suit, proceeding or
investigation described above, shall promptly notify CoreStates thereof;
provided that the failure so to notify shall not affect the obligations of
CoreStates under Section 5.12(A) unless and to the extent CoreStates has no
actual knowledge of such claim, action, suit, proceeding or investigation and
such failure so to notify materially increases CoreStates's liability under such
Section 5.12(A).

          (D) If CoreStates or any of its successors or assigns shall
consolidate with or merge into any other entity and shall not be the continuing
or surviving entity of such consolidation


                                      27
<PAGE>
 
or merger or shall transfer all or substantially all of its assets to any
entity, then and in each case, proper provision shall be made so that the
successors and assigns of CoreStates shall assume the obligations set forth in
this Section 5.12.

          (E) CoreStates shall pay all reasonable costs, including attorneys'
fees, that may be incurred by any Indemnified Party in enforcing the indemnity
and other obligations provided for in this Section 5.12.  The rights of each
Indemnified Party hereunder shall be in addition to any other rights such
Indemnified Party may have under applicable law.

     5.13.  Benefit Plans.
            ------------- 

          (A) As soon as practicable after the Effective Date, CoreStates shall
take all reasonable action so that employees of Meridian and its subsidiaries
shall be generally entitled to participate in the pension, severance, benefit,
vacation, sick pay and similar plans on substantially the same terms and
conditions as employees of CoreStates and its subsidiaries, and until such time,
the plans of Meridian shall remain in effect; provided, that no employee of
Meridian who becomes an employee of CoreStates and who elects coverage by
CoreStates's medical insurance plans shall be excluded from coverage thereunder
(for such employee or any other covered person) on the basis of a preexisting
condition that was not also excluded under Meridian's medical insurance plans,
but to the extent such preexisting condition was excluded from coverage under
Meridian's medical insurance plans, this proviso shall not require coverage for
such preexisting condition.  For the purpose of determining eligibility to
participate in such plans, eligibility for benefit forms and subsidies, the
vesting of benefits under such plans and the accrual of benefits under such
plans (including, but not limited to, any pension, severance, 401(k), employee
stock ownership, vacation and sick pay), without duplicating any benefits,
CoreStates shall give effect to years of service (and for purposes of qualified
and nonqualified pension plans, prior earnings) with Meridian or its
subsidiaries (and to the extent required by such plan, service with other
corporations), as the case may be, as if they were with CoreStates or its
subsidiaries.  CoreStates also shall, and shall cause its subsidiaries to,
continue to honor, to the extent required by law, in accordance with their terms
all employment, severance, consulting and other compensation contracts,
disclosed in Section 4.03(M) of the Meridian Disclosure Letter, between Meridian
or any of its subsidiaries and any current or former director, officer or
employee thereof.  CoreStates hereby expressly assumes and agrees to perform the
termination agreements in effect with the individuals listed on Schedule 5.13(a)
hereto in the same manner and to the same extent that Meridian would be required
to perform such agreements if CoreStates had not succeeded to the business of
Meridian. In addition, Meridian will enter into agreements with the first two
individuals listed on Schedule 5.13(a), which shall be generally


                                      28
<PAGE>
 
consistent with the summary term sheet, attached hereto as Exhibit F, and shall
supersede the termination agreements currently in effect.  The parties will work
in good faith to treat affected employees in an equitable manner under all
supplemental plans, policies or arrangements.

          (B) As soon as practicable, but no more than 60 days after the date
hereof, Meridian shall enter into agreements with those individuals listed on
Schedule 5.13(b) hereto.  Such agreements shall be substantially in the form
attached hereto as Exhibit G.  Upon execution of each such agreement, any prior
employment, salary continuation, termination, severance or other similar
agreement between such individual and Meridian or any of its subsidiaries shall
be cancelled and shall be of no further force or effect.

          (C) Any executive of Meridian (or of an affiliated company and who was
set forth on a list delivered to CoreStates prior to the execution hereof for
the following purpose) who on the date hereof has an annual salary rate of
$120,000 or more or is listed on Disclosure Letter 5.13(c) (the "Covered
Employees"), shall be covered on and after the Effective Date by an executive
severance policy (the "Policy") adopted by CoreStates (which policy shall also
benefit similarly situated CoreStates executives), which shall provide severance
benefits between 12 and 18 months (consistent with existing commitments made by
Meridian) of (i) salary continuation, (ii) the Covered Employee's 1995 target
annual bonus amount under the Meridian annual bonus plan and (iii) continuation
of medical benefits in the event that an executive is terminated other than for
"Cause", as defined in the Policy, or voluntarily terminates employment due to
certain delineated demotions; provided, however, that the average of the
severance attributable to all Covered Employees shall not exceed 15 months.  The
Policy shall generally be based on the proposed Meridian Severance Policy,
attached hereto as Exhibit H.

          (D) To the extent CoreStates provides Meridian assurances, reasonably
satisfactory to Meridian's Board of Directors, that it will honor the
obligations of Meridian under the related plans, Meridian shall take all steps
necessary to ensure that no amounts will be contributed to any grantor trust by
Meridian or its subsidiaries on account of any compensation or benefit plan,
program or arrangement benefitting one or more employees of Meridian, including,
but not limited to, the Meridian Supplemental Executive Retirement Plan, the
Meridian Supplemental Salary Reduction Plan and the Meridian Retirement
Restoration Plan.  Any such grantor trust shall be terminated and shall be of no
further force or effect as of the Effective Date, to the extent permitted by
law.

          (E) Any CoreStates or Meridian (and, in general, any employee of an
affiliated company thereof) employee who (i) is not entering into an agreement
pursuant to Section 5.13(B) hereof, (ii) is not covered by any termination or
severance


                                      29
<PAGE>
 
agreement and (iii) is not covered by the Policy described in Section 5.13(C)
above shall receive severance payments if he or she is involuntarily terminated
from employment during the period commencing on the Effective Date and ending
one year thereafter equal to the greater of six months of salary or the amount
provided for under the applicable CoreStates severance policy.  In addition,
each such terminated employee shall be entitled to continued coverage under
CoreStates's medical insurance plans (or the equivalent thereof) for a period of
time which is coextensive with the period on which the employee's severance is
based.

          (F) Meridian and CoreStates shall take all actions necessary to ensure
that on or after the Effective Date the Meridian Employee Stock Ownership Plan
(the "ESOP") shall continue in effect for employees of Meridian and CoreStates,
except that CoreStates Common Stock shall be held by the ESOP, as successor to
Meridian Common Stock.

     5.14.  Certain Director and Officer Positions.
            -------------------------------------- 

          (A) CoreStates agrees to fix the size of its Board at 15 members and
to cause five members of Meridian's Board of Directors consisting of Mr.
McCullough and Mr. Strawbridge and three other current directors of Meridian
selected by CoreStates from a list of six persons, nominated by Meridian and
willing so to serve subject to any applicable legal restrictions ("Former
Meridian Directors") to be elected or appointed as directors of CoreStates at,
or as promptly as practicable after, the Effective Time.  Two of the Former
Meridian Directors, including Mr. McCullough, shall be appointed to the class of
the Board of Directors of CoreStates elected by the shareholders of CoreStates
at the annual meeting of CoreStates immediately preceding the Effective Date.
Two of the Former Meridian Directors shall be appointed to the class of the
Board of Directors of CoreStates elected by the shareholders of CoreStates at
the annual meeting of CoreStates immediately preceding the annual meeting
referenced in the preceding sentence.  The remaining Former Meridian Director
shall be appointed to the remaining class of the CoreStates Board of Directors.

          (B) CoreStates agrees to cause that number of Former Meridian
Directors to be elected or appointed as members of the Executive Committee of
the Board of Directors of CoreStates at, or as promptly as practicable after,
the Effective Time as shall constitute one-third of the members of such
committee and which Former Meridian Directors shall include Mr. McCullough and
other Former Meridian Directors agreed upon by the Chief Executive Officers of
Meridian and CoreStates prior to the Effective Time.  In the event Meridian Bank
is merged into CoreStates Bank, N.A., the Board of Directors of CoreStates Bank,
N.A. immediately following the Merger shall consist of that number of former
Meridian Bank directors as bears the same proportion to the total number of
directors of CoreStates Bank, N.A. as the number of


                                      30
<PAGE>
 
Former Meridian Directors bears to the total number of directors of CoreStates.

          (C) At the Effective Time, CoreStates's Board of Directors shall elect
or appoint (i) Mr. McCullough as President and Chief Operating Officer of
CoreStates, (ii) Mr. Sparks as Chief Financial Officer of CoreStates, and (iii)
each of them as members of the Office of the Chairman.

     5.15.  Notification of Certain Matters.  Each of Meridian and CoreStates
            -------------------------------                                  
shall give prompt notice to the other of any fact, event or circumstance known
to it that (i) is reasonably likely, individually or taken together with all
other facts, events and circumstances known to it, to result in any Material
Adverse Effect with respect to it or (ii) would cause or constitute a material
breach of any of its representations, warranties, covenants or agreements
contained herein.

     5.16.  Dividend Adjustment.  After the date of this Agreement, each of
            -------------------                                            
CoreStates and Meridian shall coordinate with the other the payment of dividends
with respect to the CoreStates Common Stock and Meridian Common Stock and the
record dates and payment dates relating thereto, it being the intention of the
parties hereto that holders of CoreStates Common Stock and Meridian Common Stock
shall not receive two dividends, or fail to receive one dividend, for any single
calendar quarter with respect to their shares of CoreStates Common Stock and/or
Meridian Common Stock or any shares of CoreStates Common Stock that any such
holder receives in exchange for such shares of Meridian Common Stock in the
Merger.

     5.17.  Post-Merger Operations.  It is the present intention of CoreStates
            ----------------------                                            
that the Continuing Corporation maintain a substantial and prominent presence in
the Reading market and, in connection therewith, shall continue to use and
occupy Meridian's Spring Ridge Operations Center and, upon completion thereof,
Meridian's headquarters building currently under construction in Reading,
subject in each such case to such changes in business plans as the Board of
Directors of the Continuing Corporation may determine to be in the best
interests of the Continuing Corporation and its shareholders, employees,
customers and the communities it serves.

VI.  CONDITIONS TO CONSUMMATION OF THE MERGER.
     ---------------------------------------- 

     The obligations of each of the parties to consummate the Merger is
conditioned upon the satisfaction at or prior to the Effective Time of each of
the following (except that only Meridian's obligations are conditioned upon
satisfaction of Section 6.06 and only CoreStates's obligations are conditioned
upon satisfaction of Sections 6.07 and 6.12):

     6.01.  Shareholder Vote.  Approval of (i) this Plan by the requisite votes
            ----------------                                                   
of the shareholders of Meridian and CoreStates


                                      31
<PAGE>
 
and (ii) in the case of CoreStates, the amendment to its Articles of
Incorporation by the requisite vote of the shareholders of CoreStates;

     6.02.  Regulatory Approvals.  Procurement by CoreStates and Meridian of all
            --------------------                                                
requisite approvals and consents of Regulatory Authorities and the expiration of
the statutory waiting period or periods relating thereto and such approvals and
consents shall not impose any condition or restriction upon the Continuing
Corporation or its subsidiaries which would be reasonably expected either (i) to
have a Material Adverse Effect after the Effective Time on the present or
prospective consolidated financial condition, business or operating results of
the Continuing Corporation, or (ii) to prevent the parties from realizing the
major portion of the economic benefits of the Merger and the transactions
contemplated thereby that they currently anticipate obtaining therefrom;

     6.03.  Third Party Consents.  All consents or approvals of all persons
            --------------------                                           
(other than Regulatory Authorities) required for the completion of the Merger
shall have been obtained and shall be in full force and effect, unless the
failure to obtain any such consent or approval is not reasonably likely to have,
individually or in the aggregate, a Material Adverse Effect on Meridian or
CoreStates;

     6.04.  No Injunction, Etc.  No order, decree or injunction of any court or
            -------------------                                                
agency of competent jurisdiction shall be in effect, and no law, statute or
regulation shall have been enacted or adopted, that enjoins, prohibits or makes
illegal consummation of the Merger or any of the other transactions contemplated
hereby;

     6.05.  Pooling Letters.  Meridian shall have received from KPMG Peat
            ---------------                                              
Marwick LLP, independent auditors for Meridian, and CoreStates shall have
received from Ernst & Young, independent auditors for CoreStates, letters, dated
the date of or shortly prior to each of the mailing dates of the Joint Proxy
Statement and the Effective Date, to the effect that the Merger, if consummated
in accordance with this Plan, qualifies for pooling of interests accounting
treatment;

     6.06.  Representations, Warranties and Covenants of CoreStates. (i) Each of
            -------------------------------------------------------             
the representations and warranties contained herein of CoreStates shall be true
and correct as of the date of this Plan and upon the Effective Date with the
same effect as though all such representations and warranties had been made on
the Effective Date, except for any such representations and warranties made as
of a specified date, which shall be true and correct as of such date, in any
case subject to the standards established by Section 4.02, (ii) each and all of
the agreements and covenants of CoreStates to be performed and complied with
pursuant to this Plan on or prior to the Effective Date shall have been duly
performed and complied with in all material


                                      32
<PAGE>
 
respects, and (iii) Meridian shall have received a certificate signed by the
Chief Financial Officer of CoreStates, dated the Effective Date, to the effect
set forth in clauses (i) and (ii);

     6.07.  Representations, Warranties and Covenants of Meridian.  (i) Each of
            -----------------------------------------------------              
the representations and warranties contained herein of Meridian shall be true
and correct as of the date of this Plan and upon the Effective Date with the
same effect as though all such representations and warranties had been made on
the Effective Date, except for any such representations and warranties made as
of a specified date, which shall be true and correct as of such date, in any
case subject to the standards established by Section 4.02, (ii) each and all of
the agreements and covenants of Meridian to be performed and complied with
pursuant to this Plan on or prior to the Effective Date shall have been duly
performed and complied with in all material respects, and (iii) CoreStates shall
have received a certificate signed by the Chief Financial Officer of Meridian,
dated the Effective Date, to the effect set forth in clauses (i) and (ii);

     6.08.  Effective Registration Statement.  The Registration Statement shall
            --------------------------------                                   
have become effective and no stop order suspending the effectiveness of the
Registration Statement shall have been issued and no proceedings for that
purpose shall have been initiated or threatened by the SEC or any other
Regulatory Authority;

     6.09.  Blue-Sky Permits.  CoreStates shall have received all state
            ----------------                                           
securities laws and "blue sky" permits necessary to consummate the Merger;

     6.10.  Tax Opinion.  CoreStates shall have received an opinion from Simpson
            -----------                                                         
Thacher & Bartlett, and Meridian shall have received an opinion from Stevens &
Lee, to the effect that (i) the Merger constitutes a reorganization under
Section 368 of the Code, and (ii) no gain or loss will be recognized by
shareholders of Meridian who receive shares of CoreStates Common Stock, in
exchange for their shares of Meridian Common Stock, except that gain or loss may
be recognized as to cash received in lieu of fractional share interests; in
rendering their respective opinions, each such counsel may require and rely upon
representations and agreements contained in certificates of officers of
CoreStates, Meridian, and others;

     6.11.  NYSE Listing.  The shares of CoreStates Common Stock issuable
            ------------                                                 
pursuant to this Plan shall have been approved for listing on the NYSE, subject
to official notice of issuance; and

     6.12.  Rights Agreements.  No "Distribution Date," "Stock Acquisition Date"
            -----------------                                                   
or "Triggering Event" (as each of such terms are defined in the Meridian Rights
Agreement) shall have occurred.


                                      33
<PAGE>
 
VII.  TERMINATION.
      ----------- 

     7.01.  Termination.  This Plan may be terminated, and the Merger may be
            -----------                                                     
abandoned:

          (A) Mutual Consent.  At any time prior to the Effective Time, by the
              --------------                                                  
mutual consent of CoreStates and Meridian, if the Board of Directors of each so
determines by vote of a majority of the members of its entire Board.

          (B) Delay.  At any time prior to the Effective Time, by CoreStates or
              -----                                                            
Meridian, if its Board of Directors so determines by vote of a majority of the
members of its entire Board, in the event that the Merger is not consummated by
September 30, 1996, except to the extent that the failure of the Merger then to
be consummated arises out of or results from the knowing action or inaction of
the party seeking to terminate pursuant to this Section 7.01(B).

          (C) No Approval.  By Meridian or CoreStates, if its Board of Directors
              -----------                                                       
so determines by a vote of a majority of the members of its entire Board, in the
event that (i) the consent of the Board of Governors of the Federal Reserve
System for consummation of the Merger and the other transactions contemplated by
this Plan shall have been denied by final action of the Board and the time for
appeal shall have expired, or (ii) any shareholder approval required by Section
6.01 herein is not obtained at the Meridian Meeting or the CoreStates Meeting.

          (D) Possible Adjustment.  By Meridian, if its Board of Directors so
              -------------------                                            
determines by a vote of a majority of the members of its entire Board, at any
time during the ten-day period commencing two days after the Determination Date,
if either (x) both of the following conditions are satisfied:

               (1) the Average Closing Price on the Determination Date of shares
of CoreStates Common Stock shall be less than $32.725; and

               (2) (i) the number obtained by dividing the Average Closing Price
on the Determination Date by $38.50 (such number being referred to herein as the
"CoreStates Ratio") shall be less than (ii) the number obtained by dividing the
Index Price on the Determination Date by the Index Price on the Starting Date
and subtracting 0.15 from the quotient in this clause (x)(2)(ii) (such number
being referred to herein as the "Index Ratio");

or (y) the Average Closing Price on the Determination Date of shares of
CoreStates Common Stock shall be less than the product of 0.75 and the Starting
Price;

subject, however, to the following four sentences.  If Meridian elects to
exercise its termination right pursuant to the


                                      34
<PAGE>
 
immediately preceding sentence, it shall give prompt written notice to
CoreStates which notice shall specify which of clauses (x) or (y) is applicable
(or if both would be applicable, which clause is being invoked); provided that
such notice of election to terminate may be withdrawn at any time within the
aforementioned ten-day period.  During the five-day period commencing with its
receipt of such notice, CoreStates shall have the option in the case of a
failure to satisfy the condition in clause (x), of adjusting the Exchange Ratio
to equal the lesser of (i) a number equal to a quotient (rounded to the nearest
one-thousandth), the numerator of which is the product of $32.725 and the
Exchange Ratio (as then in effect) and the denominator of which is the Average
Closing Price, and (ii) a number equal to a quotient (rounded to the nearest
one-thousandth), the numerator of which is the Index Ratio multiplied by the
Exchange Ratio (as then in effect) and the denominator of which is the
CoreStates Ratio.  During such five-day period, CoreStates shall have the
option, in the case of a failure to satisfy the condition in clause (y), to
elect to increase the Exchange Ratio to equal a number equal to a quotient
(rounded to the nearest one-thousandth), the numerator of which is the product
of 0.75, the Starting Price and the Exchange Ratio (as then in effect) and the
denominator of which is the Average Closing Price.  If CoreStates makes an
election contemplated by either of the two preceding sentences, within such
five-day period, it shall give prompt written notice to Meridian of such
election and the revised Exchange Ratio, whereupon no termination shall have
occurred pursuant to this Section 7.01(D) and this Plan shall remain in effect
in accordance with its terms (except as the Exchange Ratio shall have been so
modified), and any references in this Agreement to "Exchange Ratio" shall
thereafter be deemed to refer to the Exchange Ratio as adjusted pursuant to this
Section 7.01(D).

     For purposes of this Section 7.01(D), the following terms shall have the
meanings indicated:

          "Average Closing Price" means the average of the daily last sale
     prices of CoreStates Common Stock as reported on the NYSE Composite
     Transactions reporting system (as reported in The Wall Street Journal or,
     if not reported therein, in another mutually agreed upon authoritative
     source) for the ten consecutive full trading days in which such shares are
     traded on the NYSE ending at the close of trading on the Determination
     Date.

          "Determination Date" means the date on which the approval of the
     Federal Reserve Board required for completion of the Merger shall be
     received.

          "Index Group" means the group of each of the 11 bank holding companies
     listed below, the common stock of all of which shall be publicly traded and
     as to which there shall not have been, since the Starting Date and before
     the


                                      35
<PAGE>
 
     Determination Date, an announcement of a proposal for the acquisition or
     sale of such company.  In the event that the common stock of any such
     company ceases to be publicly traded or any such announcement is made with
     respect to any such company, such company will be removed from the Index
     Group, and the weights (which have been determined based on the number of
     outstanding shares of common stock) redistributed proportionately for
     purposes of determining the Index Price.  The 11 bank holding companies and
     the weights attributed to them are as follows:

<TABLE>
<CAPTION>
 
               Bank Holding Company             Weighting
               --------------------             ---------
     
     <S>                                        <C>
     Bank of Boston (BKB)                            8.03
     Barnett Banks, Inc. (BBI)                       8.12
     Boatmen's Bancshares, Inc. (BOAT)               7.23
     Comerica (CMA)                                  6.25
     First Bank System, Inc. (FBS)                   9.78
     Fleet Financial Group, Inc. (FLT)               8.18
     KeyCorp (KEY)                                  12.02
     Mellon Bank Corporation (MBC)                  10.11
     National City Corporation (NCC)                 6.87
     PNC Financial Corp (PNC)                        9.87
     The Bank of New York Company, Inc. (BK)        13.55
                                                   ------
                                                   100.00%
</TABLE>

          "Index Price" on a given date means the weighted average (weighted in
     accordance with the factors listed above) of the closing prices of the
     companies composing the Index Group.

          "Starting Date" means October 9, 1995.

          "Starting Price" shall mean the last sale price per share of
     CoreStates Common Stock on October 10, 1995, as reported by the NYSE
     Composite Transactions reporting system (as reported in The Wall Street
     Journal or, if not reported therein, in another mutually agreed upon
     authoritative source).

     If any company belonging to the Index Group or CoreStates declares or
effects a stock dividend, reclassification, recapitalization, split-up,
combination, exchange of shares or similar transaction between the Starting Date
and the Determination Date, the prices for the common stock of such company or
CoreStates shall be appropriately adjusted for the purposes of applying this
Section 7.01(D).

          (E) Failure to Recommend, Etc.  At any time prior to the Meridian
              --------------------------                                   
Meeting, by CoreStates if the Board of Directors of Meridian shall have failed
to make its recommendation referred to in Section 5.02, withdrawn such
recommendation or modified or changed such recommendation in a manner adverse to
the interests of CoreStates; or at any time prior to the CoreStates Meeting, by


                                      36
<PAGE>
 
Meridian if the Board of Directors of CoreStates shall have failed to make its
recommendation referred to in Section 5.02, withdrawn such recommendation or
modified or changed such recommendation in a manner adverse to the interests of
Meridian.

     7.02.  Effect of Termination and Abandonment.  In the event of termination
            -------------------------------------                              
of this Plan and the abandonment of the Merger pursuant to this Article VII, no
party to this Plan shall have any liability or further obligation to any other
party hereunder except (i) as set forth in Section 8.01, (ii) that each of the
Stock Option Agreements shall be governed by its own terms as to termination and
(iii) that termination will not relieve a breaching party from liability for any
willful breach of this Plan giving rise to such termination.

VIII.  OTHER MATTERS.
       ------------- 

     8.01.  Survival.  All representations, warranties, agreements and covenants
            --------                                                            
contained in this Plan shall not survive the Effective Time or termination of
this Plan if this Plan is terminated prior to the Effective Time; provided,
however, if the Effective Time occurs, the agreements of the parties in Sections
5.12, 5.13, 5.14, 8.01, 8.04, 8.06 and 8.09 shall survive the Effective Time,
and if this Plan is terminated prior to the Effective Time, the agreements of
the parties in Sections 5.05(B), 7.02, 8.01, 8.04, 8.05, 8.06, 8.07 and 8.09,
shall survive such termination.

     8.02.  Waiver; Amendment.  Prior to the Effective Time, any provision of
            -----------------                                                
this Plan may be (i) waived by the party benefitted by the provision, or (ii)
amended or modified at any time, by an agreement in writing among the parties
hereto approved by their respective Boards of Directors and executed in the same
manner as this Plan, except that, after the Meridian Meeting the consideration
to be received by the shareholders of Meridian for each share of Meridian Common
Stock shall not thereby be decreased.

     8.03.  Counterparts.  This Plan may be executed in one or more
            ------------                                           
counterparts, each of which shall be deemed to constitute an original.

     8.04.  Governing Law.  This Plan shall be governed by, and interpreted in
            -------------                                                     
accordance with, the laws of the Commonwealth of Pennsylvania, without regard to
the conflict of law principles thereof.

     8.05.  Expenses.  Each party hereto will bear all expenses incurred by it
            --------                                                          
in connection with this Plan and the transactions contemplated hereby, except
that printing expenses and SEC registration fees shall be shared equally between
Meridian and CoreStates.


                                      37
<PAGE>
 
     8.06.  Confidentiality.  Except as otherwise provided in Section 5.05(B),
            ---------------                                                   
each of the parties hereto and their respective agents, attorneys and
accountants will maintain the confidentiality of all information provided in
connection herewith which has not been publicly disclosed or as it is advised by
counsel that any such information or document is required by law or applicable
Nasdaq or NYSE rule to be disclosed.  For purposes of this Agreement, the term
"major portion" of the economic benefits of the Merger means two-thirds of such
economic benefits.

     8.07.  Notices.  All notices, requests and other communications hereunder
            -------                                                           
to a party shall be in writing and shall be deemed given if personally
delivered, telecopied (with confirmation) or mailed by registered or certified
mail (return receipt requested) to such party at its address set forth below or
such other address as such party may specify by notice to the parties hereto.

     If to CoreStates, to:    CoreStates Financial Corp
                              Broad & Chestnut Streets
                              Philadelphia, Pennsylvania  19107
 
                              Attention:  Terrence A. Larsen,
                                      Chairman and Chief Executive
                                      Officer

     With copies to:          David T. Walker
                              Counsel
                              CoreStates Financial Corp
                              PNB Building, F.C. 1-1-17-1
                              Broad and Chestnut Streets
                              Philadelphia, Pennsylvania  19107

          and to:             Simpson Thacher & Bartlett
                              425 Lexington Avenue
                              New York, New York  10017

                              Attention:  Lee Meyerson, Esq.

     If to Meridian, to:      Meridian Bancorp, Inc.
                              35 North Sixth Street
                              Reading, Pennsylvania  19603

                              Attention:  Samuel A. McCullough,
                                      Chairman, President and
                                      Chief Executive Officer



                                      38
<PAGE>
 
     With a copy to:          Stevens & Lee
                              111 North Sixth Street
                              P.O. Box 679
                              Reading, Pennsylvania  19603
 
                              Attention:  Joseph M. Harenza,
                                     Esquire

                              Sullivan & Cromwell
                              125 Broad Street
                              New York, New York  10004

                              Attention:  H. Rodgin Cohen,
                                     Esquire

     8.08.  Definitions.  Any term defined anywhere in this Plan shall have the
            -----------                                                        
meaning ascribed to it for all purposes of this Plan (unless expressly noted to
the contrary).  In addition:

          (A) the term "Material Adverse Effect" shall mean, with respect to
Meridian or CoreStates, respectively, any effect that (i) is material and
adverse to the financial position, results of operations or business of Meridian
and its subsidiaries taken as a whole, or CoreStates and its subsidiaries taken
as a whole, respectively, or (ii) materially impairs the ability of Meridian or
CoreStates, respectively, to perform its obligations under this Plan or the
consummation of the Merger and the other transactions contemplated by this Plan;
provided, however, that Material Adverse Effect shall not be deemed to include
the impact of actions or omissions of Meridian, or CoreStates taken with the
prior informed consent of Meridian or CoreStates, as applicable, in
contemplation of the transactions contemplated hereby;

          (B) the term "person" shall mean any individual, bank, savings
association, corporation, partnership, association, joint-stock company,
business trust or unincorporated organization;

          (C) the term "Previously Disclosed" by a party shall mean information
set forth in its Disclosure Letter or a schedule that is delivered by that party
to the other party prior to the execution of this Plan and specifically
designated as information "Previously Disclosed" pursuant to this Plan;

          (D) the term "Rights" means, with respect to any person, securities or
obligations convertible into or exchangeable for, or giving any person any right
to subscribe for or acquire, or any options, calls or commitments relating to,
shares of capital stock of such person; and

          (E) the terms "subsidiary" and "significant subsidiary" shall have the
meanings set forth in Rule 1-02 of Regulation S-X of the SEC.


                                      39
<PAGE>
 
     8.09.  Entire Understanding; No Third Party Beneficiaries.  This Plan and
            --------------------------------------------------                
the Stock Option Agreements together represent the entire understanding of the
parties hereto with reference to the transactions contemplated hereby and
thereby and supersede any and all other oral or written agreements heretofore
made.  Except for Sections 5.12, 5.13 and 5.14, nothing in this Plan, expressed
or implied, is intended to confer upon any person, other than the parties hereto
or their respective successors, any rights, remedies, obligations or liabilities
under or by reason of this Plan.


                                      40
<PAGE>
 
     8.10.  Headings.  The headings contained in this Plan are for reference
            --------                                                        
purposes only and are not part of this Plan.

     IN WITNESS WHEREOF, the parties hereto have caused this instrument to be
executed in counterparts by their duly authorized officers, all as of the day
and year first above written.

                              MERIDIAN BANCORP, INC.

                              By /s/Samuel A. McCullough
                                --------------------------------
                                    Samuel A. McCullough,
                                    Chairman, President and Chief 
                                    Executive Officer


                              CORESTATES FINANCIAL CORP

                              By /s/Terrence A. Larsen
                                --------------------------------
                                    Terrence A. Larsen,
                                    Chairman and Chief Executive Officer


                                      41
<PAGE>
 
                                SCHEDULE 5.13(a)


Samuel A. McCullough
David E. Sparks
William M. Fenimore, Jr.
George W. Grosz


                                      42
<PAGE>
 
                                SCHEDULE 5.13(b)


P. Sue Perrotty
R. William Holland
Wayne R. Huey, Jr.
Thomas G. Strohm
Richard E. Meyers


                                      43
<PAGE>
 
                                                                       Exhibit A

                    FORM OF MERIDIAN STOCK OPTION AGREEMENT
                    ---------------------------------------


     STOCK OPTION AGREEMENT, dated as of October 10, 1995 (the "Agreement"), by
and between MERIDIAN BANCORP, INC., a Pennsylvania corporation ("Issuer"), and
CORESTATES FINANCIAL CORP, a Pennsylvania corporation ("Grantee").

                                    RECITALS

          A.   The Plan.  Grantee and Issuer are concurrently herewith entering
               --------                                                        
into an Agreement and Plan of Merger, dated as of the date hereof (the "Plan"),
providing for, among other things, the merger of Issuer with and into Grantee,
with Grantee being the surviving corporation.

          B.  Condition to Plan.  As a condition and inducement to Grantee's
              -----------------                                             
execution of the Plan and Grantee's agreement referred to in the next sentence,
Grantee has required that Issuer agree, and Issuer has agreed, to grant Grantee
the Option (as hereinafter defined).  As a condition and inducement to Issuer's
execution of the Plan and this Agreement, Grantee and Issuer have concurrently
herewith entered into an agreement (the "CoreStates Stock Option Agreement") to
grant an option to Issuer on terms and conditions substantially identical to
those of the Option and this Agreement.

          NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth herein and in
the Plan and the CoreStates Stock Option Agreement, and intending to be legally
bound hereby, Issuer and Grantee agree as follows:

          1.   Defined Terms.  Capitalized terms which are used but not defined
               -------------                                                   
herein shall have the meanings ascribed to such terms in the Plan.

          2.   Grant of Option.  Subject to the terms and conditions set forth
               ---------------                                                
herein, Issuer hereby grants to Grantee an irrevocable option (the "Option") to
purchase a number of shares of common stock, par value $5.00 per share ("Issuer
Common Stock"), of Issuer up to 11,506,698 of such shares (as adjusted as set
forth herein, the "Option Shares," which shall include the Option Shares before
and after any transfer of such Option Shares, but in no event shall the number
of Option Shares for which this Option is exercisable exceed 19.9% of the issued
and outstanding shares of Issuer Common Stock) at a purchase price per Option
Share (as adjusted as set forth herein, the "Purchase Price") equal to $38
13/16.  Each Option Share issued upon exercise of the Option shall be
accompanied by Meridian Rights as provided in the Meridian Rights Agreement.


                                      A-1
<PAGE>
 
          3.   Exercise of Option.
               -----------------

               (a) Provided that (i) Grantee or Holder (as hereinafter defined),
as applicable, shall not be in material breach of the agreements or covenants
contained in this Agreement or, in the case of Grantee, the Plan or the
CoreStates Stock Option, and (ii) no preliminary or permanent injunction or
other order against the delivery of shares covered by the Option issued by any
court of competent jurisdiction in the United States shall be in effect, the
Holder may exercise the Option, in whole or in part, at any time and from time
to time following the occurrence of a Purchase Event (as hereinafter defined);
provided that the Option shall terminate and be of no further force or effect
upon the earliest to occur of (A) the Effective Time, (B) termination of the
Plan in accordance with the terms thereof prior to the occurrence of a Purchase
Event or a Preliminary Purchase Event (as hereinafter defined) or (C) 18 months
after termination of the Plan following the occurrence of a Purchase Event or a
Preliminary Purchase Event; provided, however, that any purchase of shares upon
exercise of the Option shall be subject to compliance with applicable law.
Notwithstanding the termination of the Option, Grantee or Holder as the case may
be, shall be entitled to purchase those Option Shares with respect to which it
has exercised the Option in accordance herewith prior to the termination of the
Option. The term "Holder" shall mean the holder or holders of the Option from
time to time, and which initially is Grantee. The termination of the Option
shall not affect any rights hereunder which by their terms extend beyond the
date of such termination.

               (b) As used herein, a "Purchase Event" means any of the 
following events:

                   (i)    Without Grantee's prior written consent, Issuer shall
     have recommended, publicly proposed or publicly announced an intention to
     authorize, recommend or propose, or entered into an agreement with any
     person (other than Grantee or any subsidiary of Grantee) to effect (A) a
     merger, consolidation or similar transaction involving Issuer or any of its
     significant subsidiaries (other than transactions solely between Issuer's
     subsidiaries that are not violative of the Plan), (B) the disposition, by
     sale, lease, exchange or otherwise, of assets or deposits of Issuer or any
     of its significant subsidiaries representing in either case 15% or more of
     the consolidated assets or deposits of Issuer and its subsidiaries or (C)
     the issuance, sale or other disposition by Issuer of (including by way of
     merger, consolidation, share exchange or any similar transaction)
     securities representing 15% or more of the voting power of Issuer or any of
     its significant subsidiaries, other than, in each case of (A), (B), or (C),
     any merger, consolidation, share exchange or similar transaction involving
     Issuer or any of its significant subsidiaries in which the voting
     securities of Issuer 


                                      A-2
<PAGE>
 
     outstanding immediately prior thereto continue to represent (by either
     remaining outstanding or being converted into the voting securities of the
     surviving entity of any such transaction) at least 65% of the combined
     voting power of the voting securities of the Issuer or the surviving entity
     outstanding immediately after the completion of such merger, consolidation,
     or similar transaction (provided any such transaction is not violative of
     the Plan) (each of (A), (B), or (C), an "Acquisition Transaction"); or

                   (ii)   any person (other than Grantee or any subsidiary of
     Grantee) shall have acquired beneficial ownership (as such term is defined
     in Rule 13d-3 promulgated under the Exchange Act) of or the right to
     acquire beneficial ownership of, or any "group" (as such term is defined in
     Section 13(d)(3) of the Exchange Act), other than a group of which Grantee
     or any subsidiary of Grantee is a member, shall have been formed which
     beneficially owns or has the right to acquire beneficial ownership of 15%
     or more of the voting power of Issuer or any of its significant
     subsidiaries; or

                   (iii)  any person (other than Grantee or any subsidiary of
     Grantee) shall have commenced (as such term is defined in Rule 14d-2 under
     the Exchange Act) or shall have filed a registration statement under the
     Securities Act, with respect to, a tender offer or exchange offer to
     purchase any shares of Issuer Common Stock such that, upon consummation of
     such offer, such person would own or control 15% or more of the then
     outstanding shares of Issuer Common Stock (such an offer being referred to
     herein as a "Tender Offer" or an "Exchange Offer," respectively); or

                   (iv)   the shareholders shall not have approved the Plan by
     the requisite vote at the Meridian Meeting, the Meridian Meeting shall not
     have been held or shall have been canceled prior to termination of the
     Plan, or Issuer's Board of Directors shall have withdrawn or modified in a
     manner adverse to Grantee the recommendation of Issuer's Board of Directors
     with respect to the Plan, in each case after it shall have been publicly
     announced that any person (other than Grantee or any subsidiary of Grantee)
     shall have (A) made, or disclosed an intention to make, a bona fide
     proposal to engage in an Acquisition Transaction, (B) commenced a Tender
     Offer or filed a registration statement under the Securities Act with
     respect to an Exchange Offer or (C) filed an application (or given a
     notice), whether in draft or final form, under the Home Owners' Loan Act,
     as amended ("HOLA"), the BHC Act, the Bank Merger Act, as amended (the
     "BMA") or the Change in Bank Control Act of 1978, as amended (the "CBCA"),
     for approval to engage in an Acquisition Transaction.


                                      A-3
<PAGE>
 
               (c) As used herein, a "Preliminary Purchase Event" means any of
the following events:

                   (i)    any person (other than Grantee or any subsidiary of
     Grantee) shall have made a bona fide proposal to Issuer or its shareholders
     by public announcement, or written communication that is or becomes the
     subject of public disclosure, to engage in an Acquisition Transaction; or

                   (ii)   after a proposal is made by a third party to Issuer or
     its shareholders to engage in an Acquisition Transaction, or such third
     party states its intention to the Issuer to make such a proposal if the
     Plan terminates, Issuer shall have breached any representation, warranty,
     covenant or agreement contained in the Plan; or

                   (iii)  any person (other than Grantee or any subsidiary of
     Grantee) other than in connection with a transaction to which Grantee has
     given its prior written consent, shall have filed an application or notice
     with any Regulatory Authority for approval to engage in an Acquisition
     Transaction; or

                   (iv)   any event entitling Grantee to terminate the Plan
     pursuant to Section 7.01(E) thereof.

As used in this Agreement, "person" shall have the meaning specified in Sections
3(a)(9) and 13(d)(3) of the Exchange Act.

               (d) Issuer shall notify Grantee promptly in writing of the
occurrence of any Preliminary Purchase Event or Purchase Event, it being
understood that the giving of such notice by Issuer shall not be a condition to
the right of Holder to exercise the Option.

               (e) In the event Holder wishes to exercise the Option, it shall
send to Issuer a written notice (the date of which being herein referred to as
the "Notice Date") specifying (i) the total number of Option Shares it intends
to purchase pursuant to such exercise and (ii) a place and date not earlier than
three business days nor later than 15 business days from the Notice Date for the
closing (the "Closing") of such purchase (the "Closing Date"); provided that if
the Closing cannot be consummated by reason of any applicable judgement, decree,
order, law or regulation, the period of time that otherwise would run pursuant
to this sentence shall run instead from the date on which such restriction on
consummation has expired or been terminated; and provided, further, without
limiting the foregoing, that if prior notification to or approval of any
Regulatory Authority is required in connection with such purchase, Issuer shall
cooperate with the Holder in the filing of the required notice of application
for approval and the obtaining of such approval and the Closing shall occur
immediately


                                      A-4
<PAGE>
 
following such regulatory approvals (and any mandatory waiting periods).  Any
exercise of the Option shall be deemed to occur on the Notice Date relating
thereto.

               (f) Notwithstanding Section 3(e), in no event shall any Closing
Date be more than 18 months after the related Notice Date, and if the Closing
Date shall not have occurred within 18 months after the related Notice Date due
to the failure to obtain any such required approval, the exercise of the Option
effected on the Notice Date shall be deemed to have expired. In the event (i)
Holder receives official notice that an approval of any other Regulatory
Authority required for the purchase of Option Shares will not be issued or
granted or (ii) a Closing Date shall not have occurred within 18 months after
the related Notice Date due to the failure to obtain any such required approval,
Grantee shall be entitled to exercise its right as set forth in Section 8 to
exercise the Option in connection with the resale of Issuer Common Stock or
other securities pursuant to a registration statement as provided in Section 9.
The provisions of this Section 3 and Section 4 shall apply with appropriate
adjustments to any such exercise.

          4.   Payment and Delivery of Certificates.
               ------------------------------------ 

               (a) On each Closing Date, Holder shall (i) pay to Issuer, in
immediately available funds by wire transfer to a bank account designated by
Issuer, an amount equal to the Purchase Price multiplied by the number of Option
Shares to be purchased on such Closing Date, and (ii) present and surrender this
Agreement to the Issuer at the address of the Issuer specified in Section 12(f).

               (b) At each Closing, simultaneously with the delivery of
immediately available funds and surrender of this Agreement as provided in
Section 4(a), (i) Issuer shall deliver to Holder (A) a certificate or
certificates representing the Option Shares to be purchased at such Closing,
which Option Shares shall be free and clear of all Liens and subject to no
preemptive rights, and (B) if the Option is exercised in part only, an executed
new agreement with the same terms as this Agreement evidencing the right to
purchase the balance of the shares of Issuer Common Stock purchasable hereunder,
and (ii) Holder shall deliver to Issuer a letter agreeing that Holder shall not
offer to sell or otherwise dispose of such Option Shares in violation of
applicable federal and state law or of the provisions of this Agreement.

               (c) In addition to any other legend that is required by
applicable law, certificates for the Option Shares delivered at each Closing
shall be endorsed with a restrictive legend which shall read substantially as
follows:

     THE TRANSFER OF THE STOCK REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO
     RESTRICTIONS ARISING UNDER THE SECURITIES ACT OF


                                      A-5
<PAGE>
 
     1933, AS AMENDED, AND PURSUANT TO THE TERMS OF A STOCK OPTION AGREEMENT
     DATED AS OF OCTOBER 10, 1995.  A COPY OF SUCH AGREEMENT WILL BE PROVIDED TO
     THE HOLDER HEREOF WITHOUT CHARGE UPON RECEIPT BY THE ISSUER OF A WRITTEN
     REQUEST THEREFOR.

It is understood and agreed that (i) the portion of the above legend relating to
the Securities Act shall be removed by delivery of substitute certificates
without such legend if Holder shall have delivered to Issuer a copy of a letter
from the staff of the SEC, or an opinion of counsel in form and substance
reasonably satisfactory to Issuer and its counsel, to the effect that such
legend is not required for purposes of the Securities Act and (ii) the reference
to restrictions pursuant to this Agreement in the above legend shall be removed
by delivery of substitute certificate(s) without such reference if the Option
Shares evidenced by certificate(s) containing such reference have been sold or
transferred in compliance with the provisions of this Agreement under
circumstances that do not require the retention of such reference.

               (d) Upon the giving by Holder to Issuer of the written notice of
exercise of the Option provided for under Section 3(e), the tender of the
applicable Purchase Price in immediately available funds and the tender of this
Agreement to Issuer, Holder shall be deemed to be the holder of record of the
shares of Issuer Common Stock issuable upon such exercise, notwithstanding that
the stock transfer books of Issuer shall then be closed or that certificates
representing such shares of Issuer Common Stock shall not then be actually
delivered to Holder.  Issuer shall pay all expenses, and any and all United
States federal, state, and local taxes and other charges that may be payable in
connection with the preparation, issuance and delivery of stock certificates
under this Section 4(d) in the name of Holder or its assignee, transferee, or
designee.

               (e) Issuer agrees (i) that it shall at all times maintain, free
from preemptive rights, sufficient authorized but unissued or treasury shares of
Issuer Common Stock so that the Option may be exercised without additional
authorization of Issuer Common Stock after giving effect to all other options,
warrants, convertible securities and other rights to purchase Issuer Common
Stock, (ii) that it will not, by charter amendment or through reorganization,
consolidation, merger, dissolution or sale of assets, or by any other voluntary
act, avoid or seek to avoid the observance or performance of any of the
covenants, stipulations or conditions to be observed or performed hereunder by
Issuer, (iii) promptly to take all action as may from time to time be required
(including (A) complying with all premerger notification, reporting and waiting
period requirements and (B) in the event prior approval of or notice to any
Regulatory Authority is necessary before the Option may be exercised,
cooperating fully with Holder in preparing such applications or notices and
providing such information to such Regulatory


                                      A-6
<PAGE>
 
Authority as it may require) in order to permit Holder to exercise the Option
and Issuer duly and effectively to issue shares of the Issuer Common Stock
pursuant hereto, and (iv) promptly to take all action provided herein to protect
the rights of Holder against dilution.

          5.   Representations and Warranties of Issuer.  Issuer hereby
               ----------------------------------------                
represents and warrants to Grantee (and Holder, if different than Grantee) as
follows:

               (a) Corporate Authority.  Issuer has full corporate power and
                   -------------------                                      
authority to execute and deliver this Agreement and to consummate the
transactions contemplated hereby; the execution and delivery of this Agreement
and, subject to receiving any necessary Regulatory Approvals, the consummation
of the transactions contemplated hereby have been duly and validly authorized by
the Board of Directors of Issuer, and no other corporate proceedings on the part
of Issuer are necessary to authorize this Agreement or to consummate the
transactions so contemplated; this Agreement has been duly and validly executed
and delivered by Issuer.

               (b) Beneficial Ownership. To the best knowledge of Issuer, as of
                   --------------------
the date of this Agreement, no person or group has beneficial ownership of more
than 10% of the issued and outstanding shares of Issuer Common Stock.

               (c) Shares Reserved for Issuance; Capital Stock.  Issuer has 
                   -------------------------------------------
taken all necessary corporate action to authorize and reserve and permit it to
issue, and at all times from the date hereof through the termination of this
Agreement in accordance with its terms, will have reserved for issuance upon the
exercise of the Option, that number of shares of Issuer Common Stock equal to
the maximum number of shares of Issuer Common Stock at any time and from time to
time purchasable upon exercise of the Option, and all such shares, upon issuance
pursuant to the Option, will be duly authorized, validly issued, fully paid and
nonassessable, and will be delivered free and clear of all Liens, (other than
those created by this Agreement) and not subject to any preemptive rights.

               (d) No Violations.  The execution, delivery and performance of 
                   -------------
this Agreement does not and will not, and the consummation by Issuer of any of
the transactions contemplated hereby will not, constitute or result in (A) a
breach or violation of, or a default under, its articles of incorporation or by-
laws, or the comparable governing instruments of any of its subsidiaries, or (B)
a breach or violation of, or a default under, any agreement, lease, contract,
note, mortgage, indenture, arrangement or other obligation of it or any of its
subsidiaries (with or without the giving of notice, the lapse of time or both)
or under any law, rule, ordinance or regulation or judgment, decree, order,
award or governmental or non-governmental permit or license to which it or any
of its


                                      A-7
<PAGE>
 
subsidiaries is subject, that would, in any case give any other person the
ability to prevent or enjoin Issuer's performance under this Agreement in any
material respect.

               (e) Board Action.  The Board of Directors of Issuer having 
                   ------------
approved this Agreement and the consummation of the transactions contemplated
hereby by the vote of greater than 66 2/3% of the members of the Meridian
Board of Directors, the provisions of Chapter 25 of the BCL, and the provisions
of Articles Eleventh and Sixteenth of its Articles of Incorporation, do not and
will not apply to this Agreement or the purchase of shares of Issuer Common
Stock pursuant to this Agreement.

               (f) Rights Amendment.  The Meridian Rights Agreement has been 
                   ----------------
amended to provide that Grantee will not become an "Acquiring Person" or an
"Adverse Person" and that no "Triggering Event," "Stock Acquisition Date" or
"Distribution Date" (as such terms are defined in the Meridian Rights Agreement)
will occur as a result of the approval, execution or delivery of this Agreement
or the Plan or the consummation of the transactions contemplated hereby and
thereby, including the acquisition of shares of Issuer Common Stock by Grantee
or Holder pursuant to this Agreement.

          6.   Representations and Warranties of Grantee.  Grantee hereby
               -----------------------------------------                 
represents and warrants to Issuer as follows:

               (a) Corporate Authority.  Grantee has full corporate power and
                   -------------------                                       
authority to enter into this Agreement and, subject to obtaining the approvals
referred to in this Agreement, to consummate the transactions contemplated by
this Agreement; the execution and delivery of this Agreement and the
consummation of the transactions contemplated hereby have been duly authorized
by all necessary corporate action on the part of Grantee; and this Agreement has
been duly executed and delivered by Grantee.

               (b) Purchase Not for Distribution.  Any Option Shares or other
                   -----------------------------                             
securities acquired by Grantee or Holder upon exercise of the Option will not be
taken with a view to the public distribution thereof and will not be transferred
or otherwise disposed of except in a transaction registered or exempt from
registration under the Securities Act.

          7.   Adjustment upon Changes in Issuer Capitalization, Etc.
               ------------------------------------------------------

               (a) In the event of any change in Issuer Common Stock by reason
of a stock dividend, stock split, split-up, recapitalization, combination,
exchange of shares, exercise of the Meridian Rights or similar transaction, the
type and number of shares or securities subject to the Option, and the Purchase
Price therefor, shall be adjusted appropriately, and proper provision shall be
made in the agreements governing such transaction so that Holder shall receive,
upon exercise of the


                                      A-8
<PAGE>
 
Option, the number and class of shares or other securities or property that
Holder would have received in respect of Issuer Common Stock if the Option had
been exercised immediately prior to such event, or the record date therefor, as
applicable.  If any additional shares of Issuer Common Stock are issued after
the date of this Agreement (other than pursuant to an event described in the
first sentence of this Section 7(a)), upon exercise of any option to purchase
Issuer Common Stock outstanding on the date hereof, the number of shares of
Issuer Common Stock subject to the Option shall be adjusted so that, after such
issuance, it, together with any shares of Issuer Common Stock previously issued
pursuant hereto, equals 19.9% of the number of shares of Issuer Common Stock
then issued and outstanding, without giving effect to any shares subject to or
issued pursuant to the Option.    No provision of this Section 7 shall be deemed
to affect or change, or constitute authorization for any violation of, any of
the covenants or representations in the Plan.

               (b) In the event that Issuer shall enter into an agreement (i) to
consolidate with or merge into any person, other than Grantee or one of its
subsidiaries, and shall not be the continuing or surviving corporation of such
consolidation or merger, (ii) to permit any person, other than Grantee or one of
its subsidiaries, to merge into Issuer and Issuer shall be the continuing or
surviving corporation, but, in connection with such merger, the then outstanding
shares of Issuer Common Stock shall be changed into or exchanged for stock or
other securities of Issuer or any other person or cash or any other property or
the outstanding shares of Issuer Common Stock immediately prior to such merger
shall after such merger represent less than 50% of the outstanding shares and
share equivalents of the merged company, or (iii) to sell or otherwise transfer
all or substantially all of its assets or deposits to any person, other than
Grantee or one of its subsidiaries, then, and in each such case, the agreement
governing such transaction shall make proper provisions so that the Option
shall, upon the consummation of any such transaction and upon the terms and
conditions set forth herein, be converted into, or exchanged for, an option (the
"Substitute Option"), at the election of Holder, of either (x) the Acquiring
Corporation (as hereinafter defined), (y) any person that controls the Acquiring
Corporation, or (z) in the case of a merger described in clause (ii), Issuer
(such person being referred to as "Substitute Option Issuer").

               (c) The Substitute Option shall have the same terms as the
Option, provided, that, if the terms of the Substitute Option cannot, for legal
reasons, be the same as the Option, such terms shall be as similar as possible
and in no event less advantageous to Holder. Substitute Option Issuer shall also
enter into an agreement with Holder in substantially the same form as this
Agreement, which shall be applicable to the Substitute Option.


                                      A-9
<PAGE>
 
               (d) The Substitute Option shall be exercisable for such number of
shares of Substitute Common Stock (as hereinafter defined) as is equal to the
Assigned Value (as hereinafter defined) multiplied by the number of shares of
Issuer Common Stock for which the Option was theretofore exercisable, divided by
the Average Price (as hereinafter defined).  The exercise price of Substitute
Option per share of Substitute Common Stock (the "Substitute Option Price")
shall then be equal to the Purchase Price multiplied by a fraction in which the
numerator is the number of shares of Issuer Common Stock for which the Option
was theretofore exercisable and the denominator is the number of shares of the
Substitute Common Stock for which the Substitute Option is exercisable.

               (e) The following terms have the meanings indicated:

                   (i)    "Acquiring Corporation" shall mean (x) the continuing
     or surviving corporation of a consolidation or merger with Issuer (if other
     than Issuer), (y) Issuer in a merger in which Issuer is the continuing or
     surviving person, or (z) the transferee of all or substantially all of
     Issuer's assets (or a substantial part of the assets of its subsidiaries
     taken as a whole).

                   (ii)   "Substitute Common Stock" shall mean the shares of
     capital stock (or similar equity interest) with the greatest voting power
     in respect of the election of directors (or persons similarly responsible
     for the direction of the business and affairs) of the Substitute Option
     Issuer.

                   (iii)  "Assigned Value" shall mean the highest of (w) the
     price per share of Issuer Common Stock at which a Tender Offer or an
     Exchange Offer therefor has been made, (x) the price per share of Issuer
     Common Stock to be paid by any third party pursuant to an agreement with
     Issuer, (y) the highest closing price for shares of Issuer Common Stock
     within the six-month period immediately preceding the consolidation,
     merger, or sale in question and (z) in the event of a sale of all or
     substantially all of Issuer's assets or deposits an amount equal to (I) the
     sum of the price paid in such sale for such assets (and/or deposits) and
     the current market value of the remaining assets of Issuer, as determined
     by a nationally recognized investment banking firm selected by Holder
     divided by (II) the number of shares of Issuer Common Stock outstanding at
     such time. In the event that a Tender Offer or an Exchange Offer is made
     for Issuer Common Stock or an agreement is entered into for a merger or
     consolidation involving consideration other than cash, the value of the
     securities or other property issuable or deliverable in exchange for Issuer
     Common Stock shall be determined by a


                                     A-10
<PAGE>
 
     nationally recognized investment banking firm selected by Holder.

                   (iv)  "Average Price" shall mean the average closing price of
     a share of Substitute Common Stock for the one year immediately preceding
     the consolidation, merger, or sale in question, but in no event higher than
     the closing price of the shares of Substitute Common Stock on the day
     preceding such consolidation, merger or sale; provided that if Issuer is
     the issuer of the Substitute Option, the Average Price shall be computed
     with respect to a share of common stock issued by Issuer, the person
     merging into Issuer or by any company which controls such person, as Holder
     may elect.

               (f) In no event, pursuant to any of the foregoing paragraphs,
shall the Substitute Option be exercisable for more than 19.9% of the aggregate
of the shares of Substitute Common Stock outstanding prior to exercise of the
Substitute Option. In the event that the Substitute Option would be exercisable
for more than 19.9% of the aggregate of the shares of Substitute Common Stock
but for the limitation in the first sentence of this Section 7(f), Substitute
Option Issuer shall make a cash payment to Holder equal to the excess of (i) the
value of the Substitute Option without giving effect to the limitation in the
first sentence of this Section 7(f) over (ii) the value of the Substitute Option
after giving effect to the limitation in the first sentence of this Section
7(f). This difference in value shall be determined by a nationally-recognized
investment banking firm selected by Holder.

               (g) Issuer shall not enter into any transaction described in
Section 7(b) unless the Acquiring Corporation and any person that controls the
Acquiring Corporation assume in writing all the obligations of Issuer hereunder
and take all other actions that may be necessary so that the provisions of this
Section 7 are given full force and effect (including, without limitation, any
action that may be necessary so that the holders of the other shares of common
stock issued by Substitute Option Issuer are not entitled to exercise any rights
by reason of the issuance or exercise of the Substitute Option and the shares of
Substitute Common Stock are otherwise in no way distinguishable from or have
lesser economic value (other than any diminution in value resulting from the
fact that the Substitute Common Stock are restricted securities, as defined in
Rule 144 under the Securities Act or any successor provision) than other shares
of common stock issued by Substitute Option Issuer).

          8.   Repurchase at the Option of Holder.
               ---------------------------------- 

               (a) At the request of Holder at any time (i) commencing upon the
first occurrence of a Repurchase Event (as defined in Section 8(d)) and ending
18 months immediately


                                     A-11
<PAGE>
 
thereafter and (ii) for 30 business days following the occurrence of either of
the events set forth in clauses (i) and (ii) of Section 3(f) (but solely as to
shares of Issuer Common Stock with respect to which the required approval was
not received, Issuer (or any successor) shall repurchase from Holder (x) the
Option and (y) all shares of Issuer Common Stock purchased by Holder pursuant
hereto with respect to which Holder then has beneficial ownership.  The date on
which Holder exercises its rights under this Section 8 is referred to as the
"Request Date".  Such repurchase shall be at an aggregate price (the "Section 8
Repurchase Consideration") equal to the sum of:

                   (i)    the aggregate Purchase Price paid by Holder for any
     shares of Issuer Common Stock acquired pursuant to the Option with respect
     to which Holder then has beneficial ownership;

                   (ii)   the excess, if any, of (x) the Applicable Price (as
     defined below) for each share of Issuer Common Stock over (y) the Purchase
     Price (subject to adjustment pursuant to Section 7), multiplied by the
     number of shares of Issuer Common Stock with respect to which the Option
     has not been exercised; and

                   (iii)  the excess, if any, of the Applicable Price over the
     Purchase Price (subject to adjustment pursuant to Section 7) paid (or, in
     the case of Option Shares with respect to which the Option has been
     exercised but the Closing Date has not occurred, payable) by Holder for
     each share of Issuer Common Stock with respect to which the Option has been
     exercised and with respect to which Holder then has beneficial ownership,
     multiplied by the number of such shares.

               (b) If Holder exercises its rights under this Section 8, Issuer
shall, within 10 business days after the Request Date, pay the Section 8
Repurchase Consideration to Holder in immediately available funds, and
contemporaneously with such payment, Holder shall surrender to Issuer the Option
and the certificates evidencing the shares of Issuer Common Stock purchased
thereunder with respect to which Holder then has beneficial ownership, and
Holder shall warrant that it has sole record and beneficial ownership of such
shares and that the same are then free and clear of all Liens. Notwithstanding
the foregoing, to the extent that prior notification to or approval of any
Regulatory Authority is required in connection with the payment of all or any
portion of the Section 8 Repurchase Consideration, Holder shall have the ongoing
option to revoke its request for repurchase pursuant to Section 8, in whole or
in part, or to require that Issuer deliver from time to time that portion of the
Section 8 Repurchase Consideration that it is not then so prohibited from paying
and promptly file the required notice or application for approval and
expeditiously process the same (and each party shall cooperate with the other in
the filing


                                     A-12
<PAGE>
 
of any such notice or application and the obtaining of any such approval) and
the period of time that would otherwise run pursuant to the preceding sentence
for the payment of the portion of the Section 8 Repurchase Consideration shall
run instead from the date on which, as the case may be, (i) any required
notification period has expired or been terminated or (ii) such approval has
been obtained and, in either event, any requisite waiting period shall have
passed.  If any Regulatory Authority disapproves of any part of Issuer's
proposed repurchase pursuant to this Section 8, Issuer shall promptly give
notice of such fact to Holder.  If any Regulatory Authority prohibits the
repurchase in part but not in whole, then Holder shall have the right (i) to
revoke the repurchase request or (ii) to the extent permitted by such Regulatory
Authority, determine whether the repurchase should apply to the Option and/or
Option Shares and to what extent to each, and Holder shall thereupon have the
right to exercise the Option as to the number of Option Shares for which the
Option was exercisable at the Request Date less the sum of the number of shares
covered by the Option in respect of which payment has been made pursuant to
Section 8(a)(ii) and the number of shares covered by the portion of the Option
(if any) that has been repurchased; provided that if the Option shall have
terminated prior to the date of such notice or shall be scheduled to terminate
at any time before the expiration of a period ending on the thirtieth business
day after such date, Grantee shall nonetheless have the right so to exercise the
Option or exercise its rights under Section 9 until the expiration of such
period of 30 business days.  Holder shall notify Issuer of its determination
under the preceding sentence within five (5) business days of receipt of notice
of disapproval of the repurchase.

               (c) For purposes of this Agreement, the "Applicable Price" means
the highest of (i) the highest price per share of Issuer Common Stock paid for
any such share by the person or groups described in Section 8(d)(i), (ii) the
price per share of Issuer Common Stock received by holders of Issuer Common
Stock in connection with any merger or other business combination transaction
described in Section 7(b)(i), 7(b)(ii) or 7(b)(iii), or (iii) the highest
closing sales price per share of Issuer Common Stock quoted on the Nasdaq NMS
during the 40 business days preceding the Request Date; provided, however, that
in the event of a sale of less than all of Issuer's assets, the Applicable Price
shall be the sum of the price paid in such sale for such assets and the current
market value of the remaining assets of Issuer as determined by a nationally
recognized investment banking firm selected by Holder, divided by the number of
shares of the Issuer Common Stock outstanding at the time of such sale. If the
consideration to be offered, paid or received pursuant to either of the
foregoing clauses (i) or (ii) shall be other than in cash, the value of such
consideration shall be determined in good faith by an independent nationally
recognized investment banking firm selected by Holder and reasonably acceptable
to


                                     A-13
<PAGE>
 
Issuer, which determination shall be conclusive for all purposes of this
Agreement.

               (d) As used herein, "Repurchase Event" shall occur if (i) any
person (other than Grantee or any subsidiary of Grantee) shall have acquired
beneficial ownership of (as such term is defined in Rule 13d-3 promulgated under
the Exchange Act), or the right to acquire beneficial ownership of, or any
"group" (as such term is defined under the Exchange Act) shall have been formed
which beneficially owns or has the right to acquire beneficial ownership of, 25%
or more of the then outstanding shares of Issuer Common Stock, or (ii) Issuer
has entered into an agreement pursuant to which any of the transactions
described in Section 7(b)(i), 7(b)(ii) or 7(b)(iii) could or will be
consummated.

          9.   Registration Rights.
               ------------------- 

               (a) Demand Registration Rights.  Issuer shall, subject to the
                   --------------------------                               
conditions of Section 9(c) below, if requested by any Holder, including Grantee
and any permitted transferee ("Selling Shareholder"), as expeditiously as
possible prepare and file a registration statement under the Securities Act if
such registration is necessary in order to permit the sale or other disposition
of any or all shares of Issuer Common Stock or other securities that have been
acquired by or are issuable to the Selling Shareholder upon exercise of the
Option in accordance with the intended method of sale or other disposition
stated by the Selling Shareholder in such request, including without limitation
a "shelf" registration statement under Rule 415 under the Securities Act or any
successor provision, and Issuer shall use its best efforts to qualify such
shares or other securities for sale under any applicable state securities laws.

               (b) Additional Registration Rights.  If Issuer at any time after
                   ------------------------------
the exercise of the Option proposes to register any shares of Issuer Common
Stock under the Securities Act in connection with an underwritten public
offering of such Issuer Common Stock, Issuer will promptly give written notice
to the Selling Shareholders of its intention to do so and, upon the written
request of any Selling Shareholder given within 30 days after receipt of any
such notice (which request shall specify the number of shares of Issuer Common
Stock intended to be included in such underwritten public offering by the
Selling Shareholder), Issuer will cause all such shares for which a Selling
Shareholder requests participation in such registration, to be so registered and
included in such underwritten public offering; provided, however, that Issuer
may elect to not cause any such shares to be so registered (i) if the
underwriters in good faith object for valid business reasons, or (ii) in the
case of a registration solely to implement an employee benefit plan or a
registration filed on Form S-4 of the Securities Act or any successor Form;
provided, further, however, that such election pursuant to (i) may only be made
two times. If some but not all the shares


                                     A-14
<PAGE>
 
of Issuer Common Stock with respect to which Issuer shall have received requests
for registration pursuant to this Section 9(b) shall be excluded from such
registration, Issuer shall make appropriate allocation of shares to be
registered among the Selling Shareholders desiring to register their shares pro
rata in the proportion that the number of shares requested to be registered by
each such Selling Shareholder bears to the total number of shares requested to
be registered by all such Selling Shareholders then desiring to have Issuer
Common Stock registered for sale.

               (c) Conditions to Required Registration.  Issuer shall use all
                   -----------------------------------                       
reasonable efforts to cause each registration statement referred to in Section
9(a) above to become effective and to obtain all consents or waivers of other
parties which are required therefor and to keep such registration statement
effective; provided, however, that Issuer may delay any registration of Option
Shares required pursuant to Section 9(a) above for a period not exceeding 90
days provided Issuer shall in good faith determine that any such registration
would adversely affect an offering or contemplated offering of other securities
by Issuer, and Issuer shall not be required to register Option Shares under the
Securities Act pursuant to Section 9(a) above:

                   (i)   prior to the earliest of (a) termination of the Plan
     pursuant to Article VII thereof, (b) failure to obtain the requisite
     shareholder approval pursuant to Section 6.01 of the Plan, and (c) a
     Purchase Event or a Preliminary Purchase Event;

                   (ii)  on more than one occasion during any calendar year;

                   (iii) within 90 days after the effective date of a
     registration referred to in Section 9(b) above pursuant to which the
     Selling Shareholder or Selling Shareholders concerned were afforded the
     opportunity to register such shares under the Securities Act and such
     shares were registered as requested; and

                   (iv)  unless a request therefor is made to Issuer by Selling
     Shareholders that hold at least 25% or more of the aggregate number of
     Option Shares (including shares of Issuer Common Stock issuable upon
     exercise of the Option) then outstanding.

          In addition to the foregoing, Issuer shall not be required to maintain
the effectiveness of any registration statement after the expiration of nine
months from the effective date of such registration statement.  Issuer shall use
all reasonable efforts to make any filings, and take all steps, under all
applicable state securities laws to the extent necessary to permit the sale or
other disposition of the Option Shares so registered in accordance with the
intended method of distribution


                                     A-15
<PAGE>
 
for such shares; provided, however, that Issuer shall not be required to consent
to general jurisdiction or qualify to do business in any state where it is not
otherwise required to so consent to such jurisdiction or to so qualify to do
business.

               (d) Expenses.  Except where applicable state law prohibits such
                   --------                                                   
payments, Issuer will pay all expenses (including without limitation
registration fees, qualification fees, blue sky fees and expenses (including the
fees and expenses of counsel), legal expenses, including the reasonable fees and
expenses of one counsel to the holders whose Option Shares are being registered,
printing expenses and the costs of special audits or "cold comfort" letters,
expenses of underwriters, excluding discounts and commissions but including
liability insurance if Issuer so desires or the underwriters so require, and the
reasonable fees and expenses of any necessary special experts) in connection
with each registration pursuant to Section 9(a) or 9(b) above (including the
related offerings and sales by holders of Option Shares) and all other
qualifications, notifications or exemptions pursuant to Section 9(a) or 9(b)
above.

               (e) Indemnification.  In connection with any registration under
                   ---------------                                            
Section 9(a) or 9(b) above Issuer hereby indemnifies the Selling Shareholders,
and each underwriter thereof, including each person, if any, who controls such
holder or underwriter within the meaning of Section 15 of the Securities Act,
against all expenses, losses, claims, damages and liabilities caused by any
untrue, or alleged untrue, statement of a material fact contained in any
registration statement or prospectus or notification or offering circular
(including any amendments or supplements thereto) or any preliminary prospectus,
or caused by any omission, or alleged omission, to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading, except insofar as such expenses, losses, claims, damages or
liabilities of such indemnified party are caused by any untrue statement or
alleged untrue statement that was included by Issuer in any such registration
statement or prospectus or notification or offering circular (including any
amendments or supplements thereto) in reliance upon and in conformity with,
information furnished in writing to Issuer by such indemnified party expressly
for use therein, and Issuer and each officer, director and controlling person of
Issuer shall be indemnified by such Selling Shareholders, or by such
underwriter, as the case may be, for all such expenses, losses, claims, damages
and liabilities caused by any untrue, or alleged untrue, statement, that was
included by Issuer in any such registration statement or prospectus or
notification or offering circular (including any amendments or supplements
thereto) in reliance upon, and in conformity with, information furnished in
writing to Issuer by such holder or such underwriter, as the case may be,
expressly for such use.


                                     A-16
<PAGE>
 
          Promptly upon receipt by a party indemnified under this Section 9(e)
of notice of the commencement of any action against such indemnified party in
respect of which indemnity or reimbursement may be sought against any
indemnifying party under this Section 9(e), such indemnified party shall notify
the indemnifying party in writing of the commencement of such action, but the
failure so to notify the indemnifying party shall not relieve it of any
liability which it may otherwise have to any indemnified party under this
Section 9(e) unless the failure so to notify the indemnified party results in
substantial prejudice thereto.  In case notice of commencement of any such
action shall be given to the indemnifying party as above provided, the
indemnifying party shall be entitled to participate in and, to the extent it may
wish, jointly with any other indemnifying party similarly notified, to assume
the defense of such action at its own expense, with counsel chosen by it and
satisfactory to such indemnified party.  The indemnified party shall have the
right to employ separate counsel in any such action and participate in the
defense thereof, but the fees and expenses of such counsel (other than
reasonable costs of investigation) shall be paid by the indemnified party unless
(i) the indemnifying party either agrees to pay the same, (ii) the indemnifying
party fails to assume the defense of such action with counsel satisfactory to
the indemnified party, or (iii) the indemnified party has been advised by
counsel that one or more legal defenses may be available to the indemnifying
party that may be contrary to the interest of the indemnified party, in which
case the indemnifying party shall be entitled to assume the defense of such
action notwithstanding its obligation to bear fees and expenses of such counsel.
No indemnifying party shall be liable for any settlement entered into without
its consent, which consent may not be unreasonably withheld.

          If the indemnification provided for in this Section 9(e) is
unavailable to a party otherwise entitled to be indemnified in respect of any
expenses, losses, claims, damages or liabilities referred to herein, then the
indemnifying party, in lieu of indemnifying such party otherwise entitled to be
indemnified, shall contribute to the amount paid or payable by such party to be
indemnified as a result of such expenses, losses, claims, damages or liabilities
in such proportion as is appropriate to reflect the relative benefits received
by Issuer, the Selling Shareholders and the underwriters from the offering of
the securities and also the relative fault of Issuer, the Selling Shareholders
and the underwriters in connection with the statements or omissions which
resulted in such expenses, losses, claims, damages or liabilities, as well as
any other relevant equitable considerations.  The amount paid or payable by a
party as a result of the expenses, losses, claims, damages and liabilities
referred to above shall be deemed to include any legal or other fees or expenses
reasonably incurred by such party in connection with investigating or defending
any action or claim; provided, however, that in no case shall any Selling
Shareholder be responsible, in the aggregate, for any amount in


                                     A-17
<PAGE>
 
excess of the net offering proceeds attributable to its Option Shares included
in the offering.  No person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation.  Any obligation by any holder to indemnify shall be several
and not joint with other holders.

          In connection with any registration pursuant to Section 9(a) or 9(b)
above, Issuer and each Selling Shareholder (other than Grantee) shall enter into
an agreement containing the indemnification provisions of this Section 9(e).

               (f) Miscellaneous Reporting.  Issuer shall comply with all 
                   -----------------------  
reporting requirements and will do all such other things as may be necessary to
permit the expeditious sale at any time of any Option Shares by the Selling
Shareholders thereof in accordance with and to the extent permitted by any rule
or regulation promulgated by the SEC from time to time, including, without
limitation, Rule 144. Issuer shall at its expense provide the Selling
Shareholders with any information necessary in connection with the completion
and filing of any reports or forms required to be filed by them under the
Securities Act or the Exchange Act, or required pursuant to any state securities
laws or the rules of any stock exchange.

               (g) Issue Taxes.  Issuer will pay all stamp taxes in connection
                   -----------
with the issuance and the sale of the Option Shares and in connection with the
exercise of the Option, and will save the Selling Shareholders harmless, without
limitation as to time, against any and all liabilities, with respect to all such
taxes.

          10.  Quotation; Listing.  If Issuer Common Stock or any other
               ------------------                                      
securities to be acquired in connection with the exercise of the Option are then
authorized for quotation or trading or listing on the NYSE, the Nasdaq NMS or
any securities exchange, Issuer, upon the request of Holder, will promptly file
an application, if required, to authorize for quotation or trading or listing
the shares of Issuer Common Stock or other securities to be acquired upon
exercise of the Option on the NYSE, the Nasdaq NMS or such other securities
exchange and will use its best efforts to obtain approval, if required, of such
quotation or listing as soon as practicable.

          11.  Division of Option.  This Agreement (and the Option granted
               ------------------                                         
hereby) are exchangeable, without expense, at the option of Holder, upon
presentation and surrender of this Agreement at the principal office of Issuer
for other Agreements providing for Options of different denominations entitling
the holder thereof to purchase in the aggregate the same number of shares of
Issuer Common Stock purchasable hereunder.  The terms "Agreement" and "Option"
as used herein include any other Agreements and related Options for which this
Agreement (and the Option granted hereby) may be exchanged.  Upon receipt by
Issuer


                                     A-18
<PAGE>
 
of evidence reasonably satisfactory to it of the loss, theft, destruction or
mutilation of this Agreement, and (in the case of loss, theft or destruction) of
reasonably satisfactory indemnification, and upon surrender and cancellation of
this Agreement, if mutilated, Issuer will execute and deliver a new Agreement of
like tenor and date.  Any such new Agreement executed and delivered shall
constitute an additional contractual obligation on the part of Issuer, whether
or not the Agreement so lost, stolen, destroyed or mutilated shall at any time
be enforceable by anyone.

          12.  Miscellaneous.
               ------------- 

               (a) Expenses.  Each of the parties hereto shall bear and pay 
                   --------
all costs and expenses incurred by it or on its behalf in connection with the
transactions contemplated hereunder, including fees and expenses of its own
financial consultants, investment bankers, accountants and counsel.

               (b) Waiver and Amendment.  Any provision of this Agreement may be
                   --------------------
waived at any time by the party that is entitled to the benefits of such
provision.  This Agreement may not be modified, amended, altered or supplemented
except upon the execution and delivery of a written agreement executed by the
parties hereto.

               (c) Entire Agreement: No Third-Party Beneficiaries; Severability.
                   ------------------------------------------------------------
This Agreement, together with the Plan and the other documents and instruments
referred to herein and therein, between Grantee and Issuer (i) constitutes the
entire agreement and supersedes all prior agreements and understandings, both
written and oral, between the parties with respect to the subject matter hereof
and (ii) is not intended to confer upon any person other than the parties hereto
(other than the indemnified parties under Section 9(e) and any transferees of
the Option Shares or any permitted transferee of this Agreement pursuant to
Section 12(h)) any rights or remedies hereunder.  If any term, provision,
covenant or restriction of this Agreement is held by a court of competent
jurisdiction or Regulatory Authority to be invalid, void or unenforceable, the
remainder of the terms, provisions, covenants and restrictions of this Agreement
shall remain in full force and effect and shall in no way be affected impaired
or invalidated.  If for any reason such court or Regulatory Authority determines
that the Option does not permit Holder to acquire, or does not require Issuer to
repurchase, the full number of shares of Issuer Common Stock as provided in
Section 2 (as may be adjusted herein), it is the express intention of Issuer to
allow Holder to acquire or to require Issuer to repurchase such lesser number of
shares as may be permissible without any amendment or modification hereof.

               (d) Governing Law.  This Agreement shall be governed and 
                   -------------                 
construed in accordance with the laws of the


                                     A-19
<PAGE>
 
Commonwealth of Pennsylvania without regard to any applicable conflicts of law
rules.

               (e) Descriptive Headings.  The descriptive headings contained 
                   --------------------     
herein are for convenience of reference only and shall not affect in any way the
meaning or interpretation of this Agreement.

               (f) Notices.  All notices and other communications hereunder 
                   -------
shall be in writing and shall be deemed given if delivered personally,
telecopied (with confirmation) or mailed by registered or certified mail (return
receipt requested) to the parties at the addresses set forth in the Plan (or at
such other address for a party as shall be specified by like notice).

               (g) Counterparts.  This Agreement and any amendments hereto may
                   ------------
be executed in two counterparts, each of which shall be considered one and the
same agreement and shall become effective when both counterparts have been
signed, it being understood that both parties need not sign the same
counterpart.

               (h) Assignment.  Neither this Agreement nor any of the rights,
                   ----------   
interests or obligations hereunder or under the Option shall be assigned by any
of the parties hereto (whether by operation of law or otherwise) without the
prior written consent of the other party, except that Holder may assign this
Agreement to a wholly-owned subsidiary of Holder and Holder may assign its
rights hereunder in whole or in part after the occurrence of a Purchase Event.
Subject to the preceding sentence, this Agreement shall be binding upon, inure
to the benefit of and be enforceable by the parties and their respective
successors and assigns.

               (i) Further Assurances.  In the event of any exercise of the 
                   ------------------
Option by the Holder, Issuer and the Holder shall execute and deliver all other
documents and instruments and take all other action that may be reasonably
necessary in order to consummate the transactions provided for by such exercise.

               (j) Specific Performance.  The parties hereto agree that this
                   --------------------                                     
Agreement may be enforced by either party through specific performance,
injunctive relief and other equitable relief.  Both parties further agree to
waive any requirement for the securing or posting of any bond in connection with
the obtaining of any such equitable relief and that this provision is without
prejudice to any other rights that the parties hereto may have for any failure
to perform this Agreement.


                                     A-20
<PAGE>
 
          IN WITNESS WHEREOF, Issuer and Grantee have caused this Stock Option
Agreement to be signed by their respective officers thereunto duly authorized,
all as of the day and year first written above.

                                       MERIDIAN BANCORP, INC.            
                                                                         
                                       By_________________________________
                                             Samuel A. McCullough,       
                                             Chairman, President and Chief
                                             Executive Officer           
                                                                         
                                                                         
                                       CORESTATES FINANCIAL CORP         
                                                                         
                                       By_________________________________
                                             Terrence A. Larsen,         
                                             Chairman and Chief Executive 
                                             Officer                      
<PAGE>
 
                                                                       Exhibit B

                   FORM OF CORESTATES STOCK OPTION AGREEMENT
                   -----------------------------------------


          STOCK OPTION AGREEMENT, dated as of October 10, 1995 (the
"Agreement"), by and between CORESTATES FINANCIAL CORP, a Pennsylvania
corporation ("Issuer"), and MERIDIAN BANCORP, INC., a Pennsylvania corporation
("Grantee").

                                    RECITALS

          A.   The Plan.  Grantee and Issuer are concurrently herewith entering
               --------                                                        
an Agreement and Plan of Merger, dated as of the date hereof (the "Plan"),
providing for, among other things, the merger of Grantee with and into Issuer,
with Issuer being the surviving corporation.

          B.   Condition to Plan.  As a condition and inducement to Grantee's
               -----------------                                             
execution of the Plan and Grantee's agreement referred to in the next sentence,
Grantee has required that Issuer agree, and Issuer has agreed, to grant Grantee
the Option (as hereinafter defined).  As a condition and inducement to Issuer's
execution of the Plan and this Agreement, Grantee and Issuer have concurrently
herewith entered into an agreement (the "Meridian" Stock Option Agreement") to
grant an option to Issuer on terms and conditions substantially identical to
those of the Option and this Agreement.

          NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth herein and in
the Plan and the Meridian Stock Option Agreement, and intending to be legally
bound hereby, Issuer and Grantee agree as follows:

          1.   Defined Terms.  Capitalized terms which are used but not defined
               -------------                                                   
herein shall have the meanings ascribed to such terms in the Plan.

          2.   Grant of Option.  Subject to the terms and conditions set forth
               ---------------                                                
herein, Issuer hereby grants to Grantee an irrevocable option (the "Option") to
purchase a number of shares of common stock, par value $1.00 per share ("Issuer
Common Stock"), of Issuer up to 27,643,009 of such shares (as adjusted as set
forth herein, the "Option Shares," which shall include the Option Shares before
and after any transfer of such Option Shares, but in no event shall the number
of Option Shares for which this Option is exercisable exceed 19.9% of the issued
and outstanding shares of Issuer Common Stock) at a purchase price per Option
Share (as adjusted as set forth herein, the "Purchase Price") equal to $38.50.


                                      B-1
<PAGE>
 
          3.   Exercise of Option.
               ------------------ 

               (a) Provided that (i) Grantee or Holder (as hereinafter defined),
as applicable, shall not be in material breach of the agreements or covenants
contained in this Agreement or, in the case of Grantee, the Plan or the Meridian
Stock Option Agreement, and (ii) no preliminary or permanent injunction or other
order against the delivery of shares covered by the Option issued by any court
of competent jurisdiction in the United States shall be in effect, the Holder
may exercise the Option, in whole or in part, at any time and from time to time
following the occurrence of a Purchase Event (as hereinafter defined); provided
that the Option shall terminate and be of no further force or effect upon the
earliest to occur of (A) the Effective Time, (B) termination of the Plan in
accordance with the terms thereof prior to the occurrence of a Purchase Event or
a Preliminary Purchase Event (as hereinafter defined) or (C) 18 months after
termination of the Plan following the occurrence of a Purchase Event or a
Preliminary Purchase Event; provided, however, that any purchase of shares upon
exercise of the Option shall be subject to compliance with applicable law.
Notwithstanding the termination of the Option, Grantee or Holder as the case may
be, shall be entitled to purchase those Option Shares with respect to which it
has exercised the Option in accordance herewith prior to the termination of the
Option. The term "Holder" shall mean the holder or holders of the Option from
time to time, and which initially is Grantee. The termination of the Option
shall not affect any rights hereunder which by their terms extend beyond the
date of such termination.

               (b) As used herein, a "Purchase Event" means any of the following
events:

                   (i)  Without Grantee's prior written consent, Issuer shall
     have recommended, publicly proposed or publicly announced an intention to
     authorize, recommend or propose, or entered into an agreement with any
     person (other than Grantee or any subsidiary of Grantee) to effect (A) a
     merger, consolidation or similar transaction involving Issuer or any of its
     significant subsidiaries (other than transactions solely between Issuer's
     subsidiaries that are not violative of the Plan), (B) the disposition, by
     sale, lease, exchange or otherwise, of assets or deposits of Issuer or any
     of its significant subsidiaries representing in either case 15% or more of
     the consolidated assets or deposits of Issuer and its subsidiaries or (C)
     the issuance, sale or other disposition by Issuer of (including by way of
     merger, consolidation, share exchange or any similar transaction)
     securities representing 15% or more of the voting power of Issuer or any of
     its significant subsidiaries, other than, in each case of (A), (B), or (C),
     any merger, consolidation, share exchange or similar transaction involving
     Issuer or any of its significant subsidiaries in which the voting
     securities of Issuer


                                      B-2
<PAGE>
 
     outstanding immediately prior thereto continue to represent (by either
     remaining outstanding or being converted into the voting securities of the
     surviving entity of any such transaction) at least 65% of the combined
     voting power of the voting securities of the Issuer or the surviving entity
     outstanding immediately after the consummation of such merger,
     consolidation, or similar transaction (provided any such transaction is not
     violative of the Plan) (each of (A), (B), or (C), an "Acquisition
     Transaction"); or

                   (ii)  any person (other than Grantee or any subsidiary of
     Grantee) shall have acquired beneficial ownership (as such term is defined
     in Rule 13d-3 promulgated under the Exchange Act) of or the right to
     acquire beneficial ownership of, or any "group" (as such term is defined in
     Section 13(d)(3) of the Exchange Act), other than a group of which Grantee
     or any subsidiary of Grantee is a member, shall have been formed which
     beneficially owns or has the right to acquire beneficial ownership of 15%
     or more of the voting power of Issuer or any of its significant
     subsidiaries; or

                   (iii)  any person (other than Grantee or any subsidiary of
     Grantee) shall have commenced (as such term is defined in Rule 14d-2 under
     the Exchange Act) or shall have filed a registration statement under the
     Securities Act, with respect to, a tender offer or exchange offer to
     purchase any shares of Issuer Common Stock such that, upon consummation of
     such offer, such person would own or control 15% or more of the then
     outstanding shares of Issuer Common Stock (such an offer being referred to
     herein as a "Tender Offer" or an "Exchange Offer," respectively); or

                   (iv)  the shareholders shall not have approved the matters
     relating to the Plan requiring approval by the requisite vote at the
     CoreStates Meeting, the CoreStates Meeting shall not have been held or
     shall have been canceled prior to termination of the Plan, or Issuer's
     Board of Directors shall have withdrawn or modified in a manner adverse to
     Grantee the recommendation of Issuer's Board of Directors with respect to
     the matters relating to the Plan requiring approval, in each case after it
     shall have been publicly announced that any person (other than Grantee or
     any subsidiary of Grantee) shall have (A) made, or disclosed an intention
     to make, a bona fide proposal to engage in an Acquisition Transaction, (B)
     commenced a Tender Offer or filed a registration statement under the
     Securities Act with respect to an Exchange Offer or (C) filed an
     application (or given a notice), whether in draft or final form, under the
     Home Owners' Loan Act, as amended ("HOLA"), the BHC Act, the Bank Merger
     Act, as amended (the "BMA") or the Change in Bank Control Act of 1978, as
     amended (the "CBCA"), for approval to engage in an Acquisition Transaction.


                                      B-3
<PAGE>
 
               (c) As used herein, a "Preliminary Purchase Event" means any of
the following events:

                   (i)  any person (other than Grantee or any subsidiary of
     Grantee) shall have made a bona fide proposal to Issuer or its shareholders
     by public announcement, or written communication that is or becomes the
     subject of public disclosure, to engage in an Acquisition Transaction; or

                   (ii)  after a proposal is made by a third party to Issuer or
     its shareholders to engage in an Acquisition Transaction, or such third
     party states its intention to the Issuer to make such a proposal if the
     Plan terminates, Issuer shall have breached any representation, warranty,
     covenant or agreement contained in the Plan; or

                   (iii)  any person (other than Grantee or any subsidiary of
     Grantee) other than in connection with a transaction to which Grantee has
     given its prior written consent, shall have filed an application or notice
     with any Regulatory Authority for approval to engage in an Acquisition
     Transaction; or

                   (iv)  any event entitling Grantee to terminate the Plan
     pursuant to Section 7.01(E) thereof.

As used in this Agreement, "person" shall have the meaning specified in Sections
3(a)(9) and 13(d)(3) of the Exchange Act.

               (d) Issuer shall notify Grantee promptly in writing of the
occurrence of any Preliminary Purchase Event or Purchase Event, it being
understood that the giving of such notice by Issuer shall not be a condition to
the right of Holder to exercise the Option.

               (e) In the event Holder wishes to exercise the Option, it shall
send to Issuer a written notice (the date of which being herein referred to as
the "Notice Date") specifying (i) the total number of Option Shares it intends
to purchase pursuant to such exercise and (ii) a place and date not earlier than
three business days nor later than 15 business days from the Notice Date for the
closing (the "Closing") of such purchase (the "Closing Date"); provided that if
the Closing cannot be consummated by reason of any applicable judgment, decree,
order, law or regulation, the period of time that otherwise would run pursuant
to this sentence shall run instead from the date on which such restriction on
consummation has expired or been terminated; and provided, further, without
limiting the foregoing, that if prior notification to or approval of any
Regulatory Authority is required in connection with such purchase, Issuer shall
cooperate with the Holder in the filing of the required notice of application
for approval and the obtaining of such approval and the Closing shall occur
immediately


                                      B-4
<PAGE>
 
following such regulatory approvals (and any mandatory waiting periods).  Any
exercise of the Option shall be deemed to occur on the Notice Date relating
thereto.

               (f) Notwithstanding Section 3(e), in no event shall any Closing
Date be more than 18 months after the related Notice Date, and if the Closing
Date shall not have occurred within 18 months after the related Notice Date due
to the failure to obtain any such required approval, the exercise of the Option
effected on the Notice Date shall be deemed to have expired. In the event (i)
Holder receives official notice that an approval of any other Regulatory
Authority required for the purchase of Option Shares will not be issued or
granted or (ii) a Closing Date shall not have occurred within 18 months after
the related Notice Date due to the failure to obtain any such required approval,
Grantee shall be entitled to exercise its right as set forth in Section 8 to
exercise the Option in connection with the resale of Issuer Common Stock or
other securities pursuant to a registration statement as provided in Section 9.
The provisions of this Section 3 and Section 4 shall apply with appropriate
adjustments to any such exercise.

          4.   Payment and Delivery of Certificates.
               ------------------------------------ 

               (a) On each Closing Date, Holder shall (i) pay to Issuer, in
immediately available funds by wire transfer to a bank account designated by
Issuer, an amount equal to the Purchase Price multiplied by the number of Option
Shares to be purchased on such Closing Date, and (ii) present and surrender this
Agreement to the Issuer at the address of the Issuer specified in Section 12(f).

               (b) At each Closing, simultaneously with the delivery of
immediately available funds and surrender of this Agreement as provided in
Section 4(a), (i) Issuer shall deliver to Holder (A) a certificate or
certificates representing the Option Shares to be purchased at such Closing,
which Option Shares shall be free and clear of all Liens and subject to no
preemptive rights, and (B) if the Option is exercised in part only, an executed
new agreement with the same terms as this Agreement evidencing the right to
purchase the balance of the shares of Issuer Common Stock purchasable hereunder,
and (ii) Holder shall deliver to Issuer a letter agreeing that Holder shall not
offer to sell or otherwise dispose of such Option Shares in violation of
applicable federal and state law or of the provisions of this Agreement.

               (c) In addition to any other legend that is required by
applicable law, certificates for the Option Shares delivered at each Closing
shall be endorsed with a restrictive legend which shall read substantially as
follows:

     THE TRANSFER OF THE STOCK REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO
     RESTRICTIONS ARISING UNDER THE SECURITIES ACT OF


                                      B-5
<PAGE>
 
     1933, AS AMENDED, AND PURSUANT TO THE TERMS OF A STOCK OPTION AGREEMENT
     DATED AS OF OCTOBER 10, 1995.  A COPY OF SUCH AGREEMENT WILL BE PROVIDED TO
     THE HOLDER HEREOF WITHOUT CHARGE UPON RECEIPT BY THE ISSUER OF A WRITTEN
     REQUEST THEREFOR.

It is understood and agreed that (i) the portion of the above legend relating to
the Securities Act shall be removed by delivery of substitute certificate(s)
without such legend if Holder shall have delivered to Issuer a copy of a letter
from the staff of the SEC, or an opinion of counsel in form and substance
reasonably satisfactory to Issuer and its counsel, to the effect that such
legend is not required for purposes of the Securities Act and (ii) the reference
to restrictions pursuant to this Agreement in the above legend shall be removed
by delivery of substitute certificate(s) without such reference if the Option
Shares evidenced by certificate(s) containing such reference have been sold or
transferred in compliance with provisions of this Agreement under circumstances
that do not require the retention of such reference.

               (d) Upon the giving by Holder to Issuer of the written notice of
exercise of the Option provided for under Section 3(e), the tender of the
applicable Purchase Price in immediately available funds and the tender of this
Agreement to Issuer, Holder shall be deemed to be the holder of record of the
shares of Issuer Common Stock issuable upon such exercise, notwithstanding that
the stock transfer books of Issuer shall then be closed or that certificates
representing such shares of Issuer Common Stock shall not then be actually
delivered to Holder.  Issuer shall pay all expenses, and any and all United
States federal, state, and local taxes and other charges that may be payable in
connection with the preparation, issuance and delivery of stock certificates
under this Section 4(d) in the name of Holder or its assignee, transferee, or
designee.

               (e) Issuer agrees (i) that it shall at all times maintain, free
from preemptive rights, sufficient authorized but unissued or treasury shares of
Issuer Common Stock so that the Option may be exercised without additional
authorization of Issuer Common Stock after giving effect to all other options,
warrants, convertible securities and other rights to purchase Issuer Common
Stock, (ii) that it will not, by charter amendment or through reorganization,
consolidation, merger, dissolution or sale of assets, or by any other voluntary
act, avoid or seek to avoid the observance or performance of any of the
covenants, stipulations or conditions to be observed or performed hereunder by
Issuer, (iii) promptly to take all action as may from time to time be required
(including (A) complying with all premerger notification, reporting and waiting
period requirements and (B) in the event prior approval of or notice to any
Regulatory Authority is necessary before the Option may be exercised,
cooperating fully with Holder in preparing such applications or notices and
providing such information to such Regulatory


                                      B-6
<PAGE>
 
Authority as it may require) in order to permit Holder to exercise the Option
and Issuer duly and effectively to issue shares of the Issuer Common Stock
pursuant hereto, and (iv) promptly to take all action provided herein to protect
the rights of Holder against dilution.

          5.   Representations and Warranties of Issuer.  Issuer hereby
               ----------------------------------------                
represents and warrants to Grantee (and Holder, if different than Grantee) as
follows:

               (a) Corporate Authority.  Issuer has full corporate power and
                   -------------------                                      
authority to execute and deliver this Agreement and to consummate the
transactions contemplated hereby; the execution and delivery of this Agreement
and, subject to receiving any necessary Regulatory Approval, the consummation of
the transactions contemplated hereby have been duly and validly authorized by
the Board of Directors of Issuer, and no other corporate proceedings on the part
of Issuer are necessary to authorize this Agreement or to consummate the
transactions so contemplated; this Agreement has been duly and validly executed
and delivered by Issuer.

               (b) Beneficial Ownership.  To the best knowledge of Issuer, as 
                   --------------------
of the date of this Agreement, no person or group has beneficial ownership of
more than 10% of the issued and outstanding shares of Issuer Common Stock.

               (c) Shares Reserved for Issuance; Capital Stock.  Issuer has 
                   ------------------------------------------- 
taken all necessary corporate action to authorize and reserve and permit it to
issue, and at all times from the date hereof through the termination of this
Agreement in accordance with its terms, will have reserved for issuance upon the
exercise of the Option, that number of shares of Issuer Common Stock equal to
the maximum number of shares of Issuer Common Stock at any time and from time to
time purchasable upon exercise of the Option, and all such shares, upon issuance
pursuant to the Option, will be duly authorized, validly issued, fully paid and
nonassessable, and will be delivered free and clear of all Liens (other than
those created by this Agreement) and not subject to any preemptive rights.

               (d) No Violations.  The execution, delivery and performance of 
                   -------------                        
this Agreement does not and will not, and the consummation by Issuer of any of
the transactions contemplated hereby will not, constitute or result in (A) a
breach or violation of, or a default under, its articles of incorporation or by-
laws, or the comparable governing instruments of any of its subsidiaries, or (B)
a breach or violation of, or a default under, any agreement, lease, contract,
note, mortgage, indenture, arrangement or other obligation of it or any of its
subsidiaries (with or without the giving of notice, the lapse of time or both)
or under any law, rule, ordinance or regulation or judgment, decree, order,
award or governmental or non-governmental permit or license to which it or any
of its


                                      B-7
<PAGE>
 
subsidiaries is subject, that would, in any case give any other person the
ability to prevent or enjoin Issuer's performance under this Agreement in any
material respect.

               (e) Board Action.  The Board of Directors of Issuer having 
                   ------------ 
approved this Agreement and the consummation of the transactions contemplated
hereby by the vote of greater than 66 2/3% of the members of the Meridian
Board of Directors, the provisions of Chapter 25 of the BCL do not and will not
apply to this Agreement or the purchase of shares of Issuer Common Stock
pursuant to this Agreement.

          6.   Representations and Warranties of Grantee.  Grantee hereby
               -----------------------------------------                 
represents and warrants to Issuer as follows:

               (a) Corporate Authority.  Grantee has full corporate power and
                   -------------------                                       
authority to enter into this Agreement and, subject to obtaining the approvals
referred to in this Agreement, to consummate the transactions contemplated by
this Agreement; the execution and delivery of this Agreement and the
consummation of the transactions contemplated hereby have been duly authorized
by all necessary corporate action on the part of Grantee; and this Agreement has
been duly executed and delivered by Grantee.

               (b) Purchase Not for Distribution.  Any Option Shares or other
                   -----------------------------                             
securities acquired by Grantee or Holder upon exercise of the Option will not be
taken with a view to the public distribution thereof and will not be transferred
or otherwise disposed of except in a transaction registered or exempt from
registration under the Securities Act.

          7.   Adjustment upon Changes in Issuer Capitalization, etc.
               ------------------------------------------------------

               (a) In the event of any change in Issuer Common Stock by reason
of a stock dividend, stock split, split-up, recapitalization, combination,
exchange of shares, exercise of the CoreStates Rights or similar transaction,
the type and number of shares or securities subject to the Option, and the
Purchase Price therefor, shall be adjusted appropriately, and proper provision
shall be made in the agreements governing such transaction so that Holder shall
receive, upon exercise of the Option, the number and class of shares or other
securities or property that Holder would have received in respect of Issuer
Common Stock if the Option had been exercised immediately prior to such event,
or the record date therefor, as applicable. If any additional shares of Issuer
Common Stock are issued after the date of this Agreement (other than pursuant to
an event described in the first sentence of this Section 7(a)), upon exercise of
any option to purchase Issuer Common Stock outstanding on the date hereof, the
number of shares of Issuer Common Stock subject to the Option shall be adjusted
so that, after such issuance, it, together with any shares of Issuer Common
Stock previously issued pursuant hereto, equals 19.9% of the number of shares of
Issuer


                                      B-8
<PAGE>
 
Common Stock then issued and outstanding, without giving effect to any shares
subject to or issued pursuant to the Option.  No provision of this Section 7
shall be deemed to affect or change, or constitute authorization for any
violation of, any of the covenants or representations in the Plan.

               (b) In the event that Issuer shall enter into an agreement (i) to
consolidate with or merge into any person, other than Grantee or one of its
subsidiaries, and shall not be the continuing or surviving corporation of such
consolidation or merger, (ii) to permit any person, other than Grantee or one of
its subsidiaries, to merge into Issuer and Issuer shall be the continuing or
surviving corporation, but, in connection with such merger, the then outstanding
shares of Issuer Common Stock shall be changed into or exchanged for stock or
other securities of Issuer or any other person or cash or any other property or
the outstanding shares of Issuer Common Stock immediately prior to such merger
shall after such merger represent less than 50% of the outstanding shares and
share equivalents of the merged company, or (iii) to sell or otherwise transfer
all or substantially all of its assets or deposits to any person, other than
Grantee or one of its subsidiaries, then, and in each such case, the agreement
governing such transaction shall make proper provisions so that the Option
shall, upon the consummation of any such transaction and upon the terms and
conditions set forth herein, be converted into, or exchanged for, an option (the
"Substitute Option"), at the election of Holder, of either (x) the Acquiring
Corporation (as hereinafter defined), (y) any person that controls the Acquiring
Corporation, or (z) in the case of a merger described in clause (ii), Issuer
(such person being referred to as "Substitute Option Issuer").

               (c) The Substitute Option shall have the same terms as the
Option, provided, that, if the terms of the Substitute Option cannot, for legal
reasons, be the same as the Option, such terms shall be as similar as possible
and in no event less advantageous to Holder. Substitute Option Issuer shall also
enter into an agreement with Holder in substantially the same form as this
Agreement, which shall be applicable to the Substitute Option.

               (d) The Substitute Option shall be exercisable for such number of
shares of Substitute Common Stock (as hereinafter defined) as is equal to the
Assigned Value (as hereinafter defined) multiplied by the number of shares of
Issuer Common Stock for which the Option was theretofore exercisable, divided by
the Average Price (as hereinafter defined).  The exercise price of Substitute
Option per share of Substitute Common Stock (the "Substitute Option Price")
shall then be equal to the Purchase Price multiplied by a fraction in which the
numerator is the number of shares of Issuer Common Stock for which the Option
was theretofore exercisable and the denominator is the number of shares of the
Substitute Common Stock for which the Substitute Option is exercisable.


                                      B-9
<PAGE>
 
               (e) The following terms have the meanings indicated:

                   (i) "Acquiring Corporation" shall mean (x) the continuing or
     surviving corporation of a consolidation or merger with Issuer (if other
     than Issuer), (y) Issuer in a merger in which Issuer is the continuing or
     surviving person, or (z) the transferee of all or substantially all of
     Issuer's assets (or a substantial part of the assets of its subsidiaries
     taken as a whole).

                   (ii)  "Substitute Common Stock" shall mean the shares of
     capital stock (or similar equity interest) with the greatest voting power
     in respect of the election of directors (or persons similarly responsible
     for the direction of the business and affairs) of the Substitute Option
     Issuer.

                   (iii)  "Assigned Value" shall mean the highest of (w) the
     price per share of Issuer Common Stock at which a Tender Offer or an
     Exchange Offer therefor has been made, (x) the price per share of Issuer
     Common Stock to be paid by any third party pursuant to an agreement with
     Issuer, (y) the highest closing price for shares of Issuer Common Stock
     within the six-month period immediately preceding the consolidation,
     merger, or sale in question and (z) in the event of a sale of all or
     substantially all of Issuer's assets or deposits an amount equal to (I) the
     sum of the price paid in such sale for such assets (and/or deposits) and
     the current market value of the remaining assets of Issuer, as determined
     by a nationally recognized investment banking firm selected by Holder
     divided by (II) the number of shares of Issuer Common Stock outstanding at
     such time. In the event that a Tender Offer or an Exchange Offer is made
     for Issuer Common Stock or an agreement is entered into for a merger or
     consolidation involving consideration other than cash, the value of the
     securities or other property issuable or deliverable in exchange for Issuer
     Common Stock shall be determined by a nationally recognized investment
     banking firm selected by Holder.

                   (iv)  "Average Price" shall mean the average closing price of
     a share of Substitute Common Stock for the one year immediately preceding
     the consolidation, merger, or sale in question, but in no event higher than
     the closing price of the shares of Substitute Common Stock on the day
     preceding such consolidation, merger or sale; provided that if Issuer is
     the issuer of the Substitute Option, the Average Price shall be computed
     with respect to a share of common stock issued by Issuer, the person
     merging into Issuer or by any company which controls such person, as Holder
     may elect.


                                     B-10
<PAGE>
 
               (f) In no event, pursuant to any of the foregoing paragraphs,
shall the Substitute Option be exercisable for more than 19.9% of the aggregate
of the shares of Substitute Common Stock outstanding prior to exercise of the
Substitute Option. In the event that the Substitute Option would be exercisable
for more than 19.9% of the aggregate of the shares of Substitute Common Stock
but for the limitation in the first sentence of this Section 7(f), Substitute
Option Issuer shall make a cash payment to Holder equal to the excess of (i) the
value of the Substitute Option without giving effect to the limitation in the
first sentence of this Section 7(f) over (ii) the value of the Substitute Option
after giving effect to the limitation in the first sentence of this Section
7(f). This difference in value shall be determined by a nationally-recognized
investment banking firm selected by Holder.

               (g) Issuer shall not enter into any transaction described in
Section 7(b) unless the Acquiring Corporation and any person that controls the
Acquiring Corporation assume in writing all the obligations of Issuer hereunder
and take all other actions that may be necessary so that the provisions of this
Section 7 are given full force and effect (including, without limitation, any
action that may be necessary so that the holders of the other shares of common
stock issued by Substitute Option Issuer are not entitled to exercise any rights
by reason of the issuance or exercise of the Substitute Option and the shares of
Substitute Common Stock are otherwise in no way distinguishable from or have
lesser economic value (other than any diminution in value resulting from the
fact that the Substitute Common Stock are restricted securities, as defined in
Rule 144 under the Securities Act or any successor provision) than other shares
of common stock issued by Substitute Option Issuer).

          8.   Repurchase at the Option of Holder.
               ---------------------------------- 

               (a) At the request of Holder at any time (i) commencing upon the
first occurrence of a Repurchase Event (as defined in Section 8(d)) and ending
18 months immediately thereafter and (ii) for 30 business days following the
occurrence of either of the events set forth in clauses (i) and (ii) of Section
3(f) (but solely as to shares of Issuer Common Stock with respect to which the
required approval was not received) Issuer (or any successor) shall repurchase
from Holder (x) the Option and (y) all shares of Issuer Common Stock purchased
by Holder pursuant hereto with respect to which Holder then has beneficial
ownership. The date on which Holder exercises its rights under this Section 8 is
referred to as the "Request Date." Such repurchase shall be at an aggregate
price (the "Section 8 Repurchase Consideration") equal to the sum of:

                   (i)  the aggregate Purchase Price paid by Holder for any
     shares of Issuer Common Stock acquired


                                     B-11
<PAGE>
 
     pursuant to the Option with respect to which Holder then has beneficial
     ownership;

                   (ii)  the excess, if any, of (x) the Applicable Price (as
     defined below) for each share of Issuer Common Stock over (y) the Purchase
     Price (subject to adjustment pursuant to Section 7), multiplied by the
     number of shares of Issuer Common Stock with respect to which the Option
     has not been exercised; and

                   (iii)  the excess, if any, of the Applicable Price over the
     Purchase Price (subject to adjustment pursuant to Section 7) paid (or, in
     the case of Option Shares with respect to which the Option has been
     exercised but the Closing Date has not occurred, payable) by Holder for
     each share of Issuer Common Stock with respect to which the Option has been
     exercised and with respect to which Holder then has beneficial ownership,
     multiplied by the number of such shares.

               (b) If Holder exercises its rights under this Section 8, Issuer
shall, within 10 business days after the Request Date, pay the Section 8
Repurchase Consideration to Holder in immediately available funds, and
contemporaneously with such payment, Holder shall surrender to Issuer the Option
and the certificates evidencing the shares of Issuer Common Stock purchased
thereunder with respect to which Holder then has beneficial ownership, and
Holder shall warrant that it has sole record and beneficial ownership of such
shares and that the same are then free and clear of all Liens. Notwithstanding
the foregoing, to the extent that prior notification to or approval of any
Regulatory Authority is required in connection with the payment of all or any
portion of the Section 8 Repurchase Consideration, Holder shall have the ongoing
option to revoke its request for repurchase pursuant to Section 8, in whole or
in part, or to require that Issuer deliver from time to time that portion of the
Section 8 Repurchase Consideration that it is not then so prohibited from paying
and promptly file the required notice or application for approval and
expeditiously process the same (and each party shall cooperate with the other in
the filing of any such notice or application and the obtaining of any such
approval) and the period of time that would otherwise run pursuant to the
preceding sentence for the payment of the portion of the Section 8 Repurchase
Consideration shall run instead from the date on which, as the case may be, (i)
any required notification period has expired or been terminated or (ii) such
approval has been obtained and, in either event, any requisite waiting period
shall have passed. If any Regulatory Authority disapproves of any part of
Issuer's proposed repurchase pursuant to this Section 8, Issuer shall promptly
give notice of such fact to Holder. If any Regulatory Authority prohibits the
repurchase in part but not in whole, then Holder shall have the right (i) to
revoke the repurchase request or (ii) to the extent permitted by such Regulatory
Authority, determine whether the repurchase


                                     B-12
<PAGE>
 
should apply to the Option and/or Option Shares and to what extent to each, and
Holder shall thereupon have the right to exercise the Option as to the number of
Option Shares for which the Option was exercisable at the Request Date less the
sum of the number of shares covered by the Option in respect of which payment
has been made pursuant to Section 8(a)(ii) and the number of shares covered by
the portion of the Option (if any) that has been repurchased; provided that if
the Option shall have terminated prior to the date of such notice or shall be
scheduled to terminate at any time before the expiration of a period ending on
the thirtieth business day after such date, Grantee shall nonetheless have the
right so to exercise the Option or exercise its rights under Section 9 until the
expiration of such period of 30 business days.  Holder shall notify Issuer of
its determination under the preceding sentence within five (5) business days of
receipt of notice of disapproval of the repurchase.

               (c) For purposes of this Agreement, the "Applicable Price" means
the highest of (i) the highest price per share of Issuer Common Stock paid for
any such share by the person or groups described in Section 8(d)(i), (ii) the
price per share of Issuer Common Stock received by holders of Issuer Common
Stock in connection with any merger or other business combination transaction
described in Section 7(b)(i), 7(b)(ii) or 7(b)(iii), or (iii) the highest
closing sales price per share of Issuer Common Stock quoted on the NYSE (or if
Issuer Common Stock is not quoted on the NYSE, the highest bid price per share
as quoted on the principal trading market or securities exchange on which such
shares are traded as reported by a recognized source chosen by Holder) during
the 40 business days preceding the Request Date; provided, however, that in the
event of a sale of less than all of Issuer's assets, the Applicable Price shall
be the sum of the price paid in such sale for such assets and the current market
value of the remaining assets of Issuer as determined by a nationally recognized
investment banking firm selected by Holder, divided by the number of shares of
the Issuer Common Stock outstanding at the time of such sale. If the
consideration to be offered, paid or received pursuant to either of the
foregoing clauses (i) or (ii) shall be other than in cash, the value of such
consideration shall be determined in good faith by an independent nationally
recognized investment banking firm selected by Holder and reasonably acceptable
to Issuer, which determination shall be conclusive for all purposes of this
Agreement.

               (d) As used herein, "Repurchase Event" shall occur if (i) any
person (other than Grantee or any subsidiary of Grantee) shall have acquired
beneficial ownership of (as such term is defined in Rule 13d-3 promulgated under
the Exchange Act), or the right to acquire beneficial ownership of, or any
"group" (as such term is defined under the Exchange Act) shall have been formed
which beneficially owns or has the right to acquire beneficial ownership of, 25%
or more of the then


                                     B-13
<PAGE>
 
outstanding shares of Issuer Common Stock, or (ii) Issuer has entered into an
agreement pursuant to which any of the transactions described in Section
7(b)(i), 7(b)(ii) or 7(b)(iii) could or will be consummated.

          9.   Registration Rights.
               ------------------- 

               (a) Demand Registration Rights.  Issuer shall, subject to the
                   --------------------------                               
conditions of Section 9(c) below, if requested by any Holder, including Grantee
and any permitted transferee ("Selling Shareholder"), as expeditiously as
possible prepare and file a registration statement under the Securities Act if
such registration is necessary in order to permit the sale or other disposition
of any or all shares of Issuer Common Stock or other securities that have been
acquired by or are issuable to the Selling Shareholder upon exercise of the
Option in accordance with the intended method of sale or other disposition
stated by the Selling Shareholder in such request, including without limitation
a "shelf" registration statement under Rule 415 under the Securities Act or any
successor provision, and Issuer shall use its best efforts to qualify such
shares or other securities for sale under any applicable state securities laws.

               (b) Additional Registration Rights.  If Issuer at any time after 
                   ------------------------------   
the exercise of the Option proposes to register any shares of Issuer Common
Stock under the Securities Act in connection with an underwritten public
offering of such Issuer Common Stock, Issuer will promptly give written notice
to the Selling Shareholders of its intention to do so and, upon the written
request of any Selling Shareholder given within 30 days after receipt of any
such notice (which request shall specify the number of shares of Issuer Common
Stock intended to be included in such underwritten public offering by the
Selling Shareholder), Issuer will cause all such shares for which a Selling
Shareholder requests participation in such registration, to be so registered and
included in such underwritten public offering; provided, however, that Issuer
may elect to not cause any such shares to be so registered (i) if the
underwriters in good faith object for valid business reasons, or (ii) in the
case of a registration solely to implement an employee benefit plan or a
registration filed on Form S-4 of the Securities Act or any successor Form;
provided, further, however, that such election pursuant to (i) may only be made
two times. If some but not all the shares of Issuer Common Stock with respect to
which Issuer shall have received requests for registration pursuant to this
Section 9(b) shall be excluded from such registration, Issuer shall make
appropriate allocation of shares to be registered among the Selling Shareholders
desiring to register their shares pro rata in the proportion that the number of
shares requested to be registered by each such Selling Shareholder bears to the
total number of shares requested to be registered by all such Selling
Shareholders then desiring to have Issuer Common Stock registered for sale.


                                     B-14
<PAGE>
 
               (c) Conditions to Required Registration.  Issuer shall use all
                   -----------------------------------                       
reasonable efforts to cause each registration statement referred to in Section
9(a) above to become effective and to obtain all consents or waivers of other
parties which are required therefor and to keep such registration statement
effective; provided, however, that Issuer may delay any registration of Option
Shares required pursuant to Section 9(a) above for a period not exceeding 90
days provided Issuer shall in good faith determine that any such registration
would adversely affect an offering or contemplated offering of other securities
by Issuer, and Issuer shall not be required to register Option Shares under the
Securities Act pursuant to Section 9(a) above:

                   (i)  prior to the earliest of (a) termination of the Plan
     pursuant to Article VII thereof, (b) failure to obtain the requisite
     shareholder approval pursuant to Section 6.01 of the Plan, and (c) a
     Purchase Event or a Preliminary Purchase Event;

                   (ii)  on more than one occasion during any calendar year;

                   (iii)  within 90 days after the effective date of a
     registration referred to in Section 9(b) above pursuant to which the
     Selling Shareholder or Selling Shareholders concerned were afforded the
     opportunity to register such shares under the Securities Act and such
     shares were registered as requested; and

                   (iv)  unless a request therefor is made to Issuer by Selling
     Shareholders that hold at least 25% or more of the aggregate number of
     Option Shares (including shares of Issuer Common Stock issuable upon
     exercise of the Option) then outstanding.

               In addition to the foregoing, Issuer shall not be required to
maintain the effectiveness of any registration statement after the expiration of
nine months from the effective date of such registration statement. Issuer shall
use all reasonable efforts to make any filings, and take all steps, under all
applicable state securities laws to the extent necessary to permit the sale or
other disposition of the Option Shares so registered in accordance with the
intended method of distribution for such shares; provided, however, that Issuer
shall not be required to consent to general jurisdiction or qualify to do
business in any state where it is not otherwise required to so consent to such
jurisdiction or to so qualify to do business.

               (d) Expenses.  Except where applicable state law prohibits such
                   --------                                                   
payments, Issuer will pay all expenses (including without limitation
registration fees, qualification fees, blue sky fees and expenses (including the
fees and expenses of counsel), legal expenses, including the reasonable fees and
expenses of one counsel to the holders whose Option Shares are


                                     B-15
<PAGE>
 
being registered, printing expenses and the costs of special audits or "cold
comfort" letters, expenses of underwriters, excluding discounts and commissions
but including liability insurance if Issuer so desires or the underwriters so
require, and the reasonable fees and expenses of any necessary special experts)
in connection with each registration pursuant to Section 9(a) or 9(b) above
(including the related offerings and sales by holders of Option Shares) and all
other qualifications, notifications or exemptions pursuant to Section 9(a) or
9(b) above.

               (e) Indemnification.  In connection with any registration under
                   ---------------                                            
Section 9(a) or 9(b) above Issuer hereby indemnifies the Selling Shareholders,
and each underwriter thereof, including each person, if any, who controls such
holder or underwriter within the meaning of Section 15 of the Securities Act,
against all expenses, losses, claims, damages and liabilities caused by any
untrue, or alleged untrue, statement of a material fact contained in any
registration statement or prospectus or notification or offering circular
(including any amendments or supplements thereto) or any preliminary prospectus,
or caused by any omission, or alleged omission, to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading, except insofar as such expenses, losses, claims, damages or
liabilities of such indemnified party are caused by any untrue statement or
alleged untrue statement that was included by Issuer in any such registration
statement or prospectus or notification or offering circular (including any
amendments or supplements thereto) in reliance upon and in conformity with,
information furnished in writing to Issuer by such indemnified party expressly
for use therein, and Issuer and each officer, director and controlling person of
Issuer shall be indemnified by such Selling Shareholders, or by such
underwriter, as the case may be, for all such expenses, losses, claims, damages
and liabilities caused by any untrue, or alleged untrue, statement, that was
included by Issuer in any such registration statement or prospectus or
notification or offering circular (including any amendments or supplements
thereto) in reliance upon, and in conformity with, information furnished in
writing to Issuer by such holder or such underwriter, as the case may be,
expressly for such use.

               Promptly upon receipt by a party indemnified under this Section
9(e) of notice of the commencement of any action against such indemnified party
in respect of which indemnity or reimbursement may be sought against any
indemnifying party under this Section 9(e), such indemnified party shall notify
the indemnifying party in writing of the commencement of such action, but the
failure so to notify the indemnifying party shall not relieve it of any
liability which it may otherwise have to any indemnified party under this
Section 9(e) unless the failure so to notify the indemnified party results in
substantial prejudice thereto. In case notice of commencement of any such action
shall be given to the indemnifying party as above provided, the


                                     B-16
<PAGE>
 
indemnifying party shall be entitled to participate in and, to the extent it may
wish, jointly with any other indemnifying party similarly notified, to assume
the defense of such action at its own expense, with counsel chosen by it and
satisfactory to such indemnified party.  The indemnified party shall have the
right to employ separate counsel in any such action and participate in the
defense thereof, but the fees and expenses of such counsel (other than
reasonable costs of investigation) shall be paid by the indemnified party unless
(i) the indemnifying party either agrees to pay the same, (ii) the indemnifying
party fails to assume the defense of such action with counsel satisfactory to
the indemnified party, or (iii) the indemnified party has been advised by
counsel that one or more legal defenses may be available to the indemnifying
party that may be contrary to the interest of the indemnified party, in which
case the indemnifying party shall be entitled to assume the defense of such
action notwithstanding its obligation to bear fees and expenses of such counsel.
No indemnifying party shall be liable for any settlement entered into without
its consent, which consent may not be unreasonably withheld.

               If the indemnification provided for in this Section 9(e) is
unavailable to a party otherwise entitled to be indemnified in respect of any
expenses, losses, claims, damages or liabilities referred to herein, then the
indemnifying party, in lieu of indemnifying such party otherwise entitled to be
indemnified, shall contribute to the amount paid or payable by such party to be
indemnified as a result of such expenses, losses, claims, damages or liabilities
in such proportion as is appropriate to reflect the relative benefits received
by Issuer, the Selling Shareholders and the underwriters from the offering of
the securities and also the relative fault of Issuer, the Selling Shareholders
and the underwriters in connection with the statements or omissions which
resulted in such expenses, losses, claims, damages or liabilities, as well as
any other relevant equitable considerations.  The amount paid or payable by a
party as a result of the expenses, losses, claims, damages and liabilities
referred to above shall be deemed to include any legal or other fees or expenses
reasonably incurred by such party in connection with investigating or defending
any action or claim; provided, however, that in no case shall any Selling
Shareholder be responsible, in the aggregate, for any amount in excess of the
net offering proceeds attributable to its Option Shares included in the
offering.  No person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Securities Act) shall be entitled to contribution from
any person who was not guilty of such fraudulent misrepresentation.  Any
obligation by any holder to indemnify shall be several and not joint with other
holders.

               In connection with any registration pursuant to Section 9(a) or
9(b) above, Issuer and each Selling Shareholder (other than Grantee) shall enter
into an agreement containing the indemnification provisions of this Section
9(e).


                                     B-17
<PAGE>
 
               (f) Miscellaneous Reporting.  Issuer shall comply with all 
                   -----------------------
reporting requirements and will do all such other things as may be necessary to
permit the expeditious sale at any time of any Option Shares by the Selling
Shareholders thereof in accordance with and to the extent permitted by any rule
or regulation promulgated by the SEC from time to time, including, without
limitation, Rule 144. Issuer shall at its expense provide the Selling
Shareholders with any information necessary in connection with the completion
and filing of any reports or forms required to be filed by them under the
Securities Act or the Exchange Act, or required pursuant to any state securities
laws or the rules of any stock exchange.

               (g) Issue Taxes.  Issuer will pay all stamp taxes in connection
                   -----------   
with the issuance and the sale of the Option Shares and in connection with the
exercise of the Option, and will save the Selling Shareholders harmless, without
limitation as to time, against any and all liabilities, with respect to all such
taxes.

          10.  Quotation; Listing.  If Issuer Common Stock or any other
               ------------------                                      
securities to be acquired in connection with the exercise of the Option are then
authorized for quotation or trading or listing on the NYSE or any securities
exchange, Issuer, upon the request of Holder, will promptly file an application,
if required, to authorize for quotation or trading or listing the shares of
Issuer Common Stock or other securities to be acquired upon exercise of the
Option on the NYSE or such other securities exchange and will use its best
efforts to obtain approval, if required, of such quotation or listing as soon as
practicable.

          11.  Division of Option.  This Agreement (and the Option granted
               ------------------                                         
hereby) are exchangeable, without expense, at the option of Holder, upon
presentation and surrender of this Agreement at the principal office of Issuer
for other Agreements providing for Options of different denominations entitling
the holder thereof to purchase in the aggregate the same number of shares of
Issuer Common Stock purchasable hereunder.  The terms "Agreement" and "Option"
as used herein include any other Agreements and related Options for which this
Agreement (and the Option granted hereby) may be exchanged.  Upon receipt by
Issuer of evidence reasonably satisfactory to it of the loss, theft, destruction
or mutilation of this Agreement, and (in the case of loss, theft or destruction)
of reasonably satisfactory indemnification, and upon surrender and cancellation
of this Agreement, if mutilated, Issuer will execute and deliver a new Agreement
of like tenor and date.  Any such new Agreement executed and delivered shall
constitute an additional contractual obligation on the part of Issuer, whether
or not the Agreement so lost, stolen, destroyed or mutilated shall at any time
be enforceable by anyone.


                                     B-18
<PAGE>
 
          12.  Miscellaneous.
               ------------- 

               (a) Expenses.  Each of the parties hereto shall bear and pay all
                   -------- 
costs and expenses incurred by it or on its behalf in connection with the
transactions contemplated hereunder, including fees and expenses of its own
financial consultants, investment bankers, accountants and counsel.

               (b) Waiver and Amendment.  Any provision of this Agreement may be
                   --------------------                                         
waived at any time by the party that is entitled to the benefits of such
provision.  This Agreement may not be modified, amended, altered or supplemented
except upon the execution and delivery of a written agreement executed by the
parties hereto.

               (c) Entire Agreement:  No Third-Party Beneficiaries; 
                   ------------------------------------------------
Severability.  This Agreement, together with the Plan and the other documents 
- -------------  
and instruments referred to herein and therein, between Grantee and Issuer (i)
constitutes the entire agreement and supersedes all prior agreements and
understandings, both written and oral, between the parties with respect to the
subject matter hereof and (ii) is not intended to confer upon any person other
than the parties hereto (other than the indemnified parties under Section 9(e)
and any transferees of the Option Shares or any permitted transferee of this
Agreement pursuant to Section 12(h)) any rights or remedies hereunder. If any
term, provision, covenant or restriction of this Agreement is held by a court of
competent jurisdiction or Regulatory Authority to be invalid, void or
unenforceable, the remainder of the terms, provisions, covenants and
restrictions of this Agreement shall remain in full force and effect and shall
in no way be affected, impaired or invalidated. If for any reason such court or
Regulatory Authority determines that the Option does not permit Holder to
acquire, or does not require Issuer to repurchase, the full number of shares of
Issuer Common Stock as provided in Section 2 (as may be adjusted herein), it is
the express intention of Issuer to allow Holder to acquire or to require Issuer
to repurchase such lesser number of shares as may be permissible without any
amendment or modification hereof.

               (d) Governing Law.  This Agreement shall be governed and 
                   -------------
construed in accordance with the laws of the Commonwealth of Pennsylvania
without regard to any applicable conflicts of law rules.

               (e) Descriptive Headings.  The descriptive headings contained 
                   -------------------- 
herein are for convenience of reference only and shall not affect in any way the
meaning or interpretation of this Agreement.

               (f) Notices.  All notices and other communications hereunder 
                   -------
shall be in writing and shall be deemed given if delivered personally,
telecopied (with confirmation) or mailed by registered or certified mail (return
receipt requested)


                                     B-19
<PAGE>
 
to the parties at the addresses set forth in the Plan (or at such other address
for a party as shall be specified by like notice).

               (g) Counterparts.  This Agreement and any amendments hereto may
                   ------------
be executed in two counterparts, each of which shall be considered one and the
same agreement and shall become effective when both counterparts have been
signed, it being understood that both parties need not sign the same
counterpart.

               (h) Assignment.  Neither this Agreement nor any of the rights,
                   ----------                                                
interests or obligations hereunder or under the Option shall be assigned by any
of the parties hereto (whether by, operation of law or otherwise) without the
prior written consent of the other party, except that Holder may assign this
Agreement to a wholly-owned subsidiary of Holder and Holder may assign its
rights hereunder in whole or in part after the occurrence of a Purchase Event.
Subject to the preceding sentence, this Agreement shall be binding upon, inure
to the benefit of and be enforceable by the parties and their respective
successors and assigns.

               (i) Further Assurances.  In the event of any exercise of the 
                   ------------------
Option by the Holder, Issuer and the Holder shall execute and deliver all other
documents and instruments and take all other action that may be reasonably
necessary in order to consummate the transactions provided for by such exercise.

               (j) Specific Performance.  The parties hereto agree that this
                   --------------------                                     
Agreement may be enforced by either party through specific performance,
injunctive relief and other equitable relief.  Both parties further agree to
waive any requirement for the securing or posting of any bond in connection with
the obtaining of any such equitable relief and that this provision is without
prejudice to any other rights that the parties hereto may have for any failure
to perform this Agreement.


                                     B-20
<PAGE>
 
          IN WITNESS WHEREOF, Issuer and Grantee have caused this Stock Option
Agreement to be signed by their respective officers thereunto duly authorized,
all as of the day and year first written above.

                                       CORESTATES FINANCIAL CORP            
                                                                            
                                       By_________________________________  
                                             Terrence A. Larsen,            
                                             Chairman and Chief Executive   
                                             Officer                        
                                                                            
                                                                            
                                       MERIDIAN BANCORP, INC.               
                                                                            
                                       By_________________________________  
                                             Samuel A. McCullough,          
                                             Chairman, President and Chief  
                                             Executive Officer               
<PAGE>
 
                                                                       Exhibit C

                         AMENDMENT TO RIGHTS AGREEMENT
                         -----------------------------


          Amendment No. 2, dated as of October 10, 1995, to the Rights
Agreement, dated as of July 25, 1989, as amended June 28, 1994 (as amended, the
"Rights Agreement"), between MERIDIAN BANCORP, INC., a Pennsylvania business
corporation (the "Company"), and MERIDIAN TRUST COMPANY, a Pennsylvania trust
company, as Rights Agent (the "Rights Agent").

                                   WITNESSETH
                                   ----------

          WHEREAS, the Rights (as defined in the Rights Agreement) distributed
in accordance with the Rights Agreement remain issued and outstanding;

          WHEREAS, no Distribution Date or Triggering Event (each as defined in
the Rights Agreement) has occurred;

          WHEREAS, the Company and CoreStates Financial Corp, a Pennsylvania
business corporation ("CoreStates"), propose to enter into an Agreement and Plan
of Merger (the "Merger Agreement"), pursuant to which the Company would merge
with and into CoreStates (the "Merger");

          WHEREAS, concurrently with the execution of the Merger Agreement, the
Company and CoreStates will enter into a Stock Option Agreement referred to
therein (the "Stock Option Agreement") pursuant to which the Company would grant
to CoreStates an option to acquire up to 19.9% of the outstanding shares of
Common Stock of the Company under certain circumstances;

          WHEREAS, in connection with the anticipated approval, execution and
delivery of the Merger Agreement and the Stock Option Agreement, the Board of
Directors of the Company deems it advisable and in the best interests of the
Company to make certain changes in the Rights Agreement as set forth herein; and

          WHEREAS, the Board of Directors of the Company has adopted, in
accordance with Section 27 of the Rights Agreement, a resolution approving this
Amendment and directing the appropriate officers of the Company to take all
appropriate steps to execute and put into effect this Amendment and an
appropriate officer of the Company has provided a certificate to the Rights
Agent as provided for in such Section 27.

          NOW, THEREFORE, in consideration of the premises and covenants set
forth in the Rights Agreement and this Amendment, the parties hereby agree as
follows:


                                      C-1
<PAGE>
 
          1.   Section 1(a) of the Rights Agreement is hereby amended to read in
its entirety as follows:

               "(a)  "Acquiring Person" shall mean any Person who or which,
     together with all Affiliates and Associates of such Person, shall be the
     Beneficial Owner of (i) 19.9% or more of the shares of Common Stock or (ii)
     Voting Securities that in the aggregate represent 19.9% or more of the
     Total Voting Power, but shall not include any of the following:

                   (A) the Company, any Subsidiary of the Company, any employee
          stock option plan or other employee benefit plan of the Company or of
          any Subsidiary of the Company, or any Person or entity organized,
          appointed or established by the Company for or pursuant to the terms
          of any such plan;

                   (B) until the termination of the Stock Option Agreement in
          accordance with its terms prior to any exercise thereunder, CoreStates
          or any Affiliate or Associate of CoreStates, as a result of their
          acquisition of Beneficial Ownership of Common Stock of the Company by
          reason of the approval, execution, or delivery of the Stock Option
          Agreement or the Merger Agreement or by reason of the completion of
          any transaction or the exercise of any Option contemplated by the
          Stock Option Agreement or the Merger Agreement, so long as CoreStates
          and any Affiliate or Associate of CoreStates is not the Beneficial
          Owner of any Common Stock of the Company other than (w) Common Stock
          of the Company of which CoreStates or any Affiliate or Associate of
          CoreStates is or becomes the Beneficial Owner by reason of the
          approval, execution, or delivery of the Stock Option Agreement or the
          Merger Agreement, or by reason of the completion of any transaction or
          the exercising of the Option contemplated by the Stock Option
          Agreement, the Merger Agreement, or both, (x) Common Stock of the
          Company Beneficially Owned by CoreStates or any Affiliate or Associate
          of CoreStates on the date hereof, (y) Common Stock of the Company of
          which CoreStates or any Affiliate or Associate of CoreStates
          inadvertently becomes the Beneficial Owner after the date hereof,
          provided that the number of such shares of Common Stock does not
          exceed 1% of the shares of Common Stock of the Company outstanding on
          the date hereof and that CoreStates or any such Affiliate or
          Associate, as the case may be, divests such Common Stock as soon as
          practicable after it becomes aware of such acquisition of Beneficial
          Ownership, and (z) Common Stock of the Company


                                      C-2
<PAGE>
 
          Beneficially Owned or otherwise held by CoreStates or any Affiliate or
          Associate of CoreStates in a bona fide fiduciary capacity or in
          satisfaction of debts previously contracted in good faith, in either
          case in the ordinary course of its banking business.

     Notwithstanding the foregoing, no Person shall become an "Acquiring Person"
     solely as the result of any acquisition of Common Stock by the Company
     which, by reducing the number of shares outstanding, increases the
     proportionate number of shares beneficially owned by such Person to 19.9%
     or more of the Common Stock of the Company then outstanding; provided,
     however, that if a Person not otherwise excluded from the definition of
     "Acquiring Person" pursuant to Paragraph (B) above shall become the
     Beneficial Owner of 19.9% or more of the Common Stock of the Company then
     outstanding by reason of share purchases by the Company and shall, after
     such share purchases by the Company, become the Beneficial Owner of any
     additional Common Stock of the Company, then such Person shall be deemed to
     be an Acquiring Person."

          2.   Section 1(b) of the Rights Agreement is hereby amended to read in
its entirety as follows:

                   "(b) 'Adverse Person' shall mean any Person declared to be
               an Adverse Person by the Board of Directors upon a determination
               by such Directors that the criteria set forth in Section
               11(a)(ii)(B) apply to such Person, provided, however, that the
                                                  --------  -------          
               Board of Directors shall not declare CoreStates or any Affiliate
               or Associate of CoreStates to be an Adverse Person as a result of
               the Merger Agreement, the Stock Option Agreement, their
               acquisition of Beneficial Ownership of shares of Common Stock by
               reason of the Stock Option Agreement or the Merger Agreement, or
               by reason of the consummation of any transaction or the exercise
               of any option contemplated by the Stock Option Agreement or the
               Merger Agreement."

          3.   A new Section 1(ll) is added to the Rights Agreement, to read as
follows:

               "(ll)  "CoreStates" shall mean CoreStates Financial Corp, a
     corporation duly organized and existing under the laws of the Commonwealth
     of Pennsylvania, and its successors."

          4.   A new Section 1(mm) is added to the Rights Agreement, to read as
follows:


                                      C-3
<PAGE>
 
               "(mm)  "Merger Agreement" shall mean the Agreement and Plan of
     Merger, dated as of October 10, 1995, by and between CoreStates and the
     Company, as the same may be amended from time to time."

          5.   A new Section 1(nn) is added to the Rights Agreement, to read as
follows:

               "(nn)  "Stock Option Agreement" shall mean the Stock Option
     Agreement, dated as of October 10, 1995, by and between the Company, as
     issuer, and CoreStates, as grantee, as the same may be amended from time to
     time."

          6.   A new Section 1(oo) is added to the Rights Agreement, to read as
follows:

               "(oo)  "Termination Time" shall be immediately prior to the
     Effective Time, as defined in the Merger Agreement."

          7.   Section 7(a) of the Rights Agreement is hereby amended to read in
its entirety as follows:

               "(a)  Subject to Section 7(e) hereof, the registered holder of
     any Rights Certificate may exercise the Rights evidenced thereby (except as
     otherwise provided herein including, without limitation, the restrictions
     on exercisability set forth in Section 9(c), Section 11(a)(iii), and
     Section 23(a) hereof) in whole or in part at any time after the
     Distribution Date upon surrender of the Rights Certificate, with the form
     of election to purchase and the certificate on the reverse side thereof
     duly executed, to the Rights Agent at the principal office or offices of
     the Rights Agent designated for such purpose, together with payment of the
     aggregate Purchase Price with respect to the total number of one one-
     hundredths of a share (or other securities, cash, or other assets, as the
     case may be) as to which such surrendered Rights are then exercisable, at
     or prior to the earliest of (i) the close of business on July 25, 1999 (the
     "Final Expiration Date"), (ii) the time at which the Rights are redeemed as
     provided in Section 23 hereof (the earlier of (i) and (ii) being herein
     referred to as the "Expiration Date"), (iii) the time at which such Rights
     are exchanged as provided in Section 24 hereof, or (iv) the Termination
     Time.

          8.   Section 13(a) of the Rights Agreement is hereby amended to read
in its entirety as follows:


                                      C-4
<PAGE>
 
               "(a)  In the event that, following the Stock Acquisition Date,
     directly or indirectly, (x) the Company shall consolidate with, or merge
     with and into, any other Person (other than a Subsidiary of the Company in
     a transaction which complies with Section 11(o) hereof), and the Company
     shall not be the continuing or surviving corporation of such consolidation
     or merger, (y) any Person (other than a Subsidiary of the Company in a
     transaction which complies with Section 11(o) hereof) shall consolidate
     with, or merge with or into, the Company, and the Company shall be the
     continuing or surviving corporation of such consolidation or merger and, in
     connection with such consolidation or merger, all or part of the
     outstanding shares of Voting Securities shall be changed into or exchanged
     for stock or other securities of any other Person or cash or any other
     property, or (z) the Company shall sell or otherwise transfer (or one or
     more of its Subsidiaries shall sell or otherwise transfer), in one
     transaction or a series of related transactions, assets or earning power
     aggregating more than 50% of the assets or earning power of the Company and
     its Subsidiaries (taken as a whole) to any Person or Persons (other than
     the Company  or any Subsidiary of the Company in one or more transactions
     each of which complies with Section 11(o) hereof); provided, however, that
     so long as the Merger Agreement shall not have been terminated, the
     references to other "Person" and any "Person" with respect to the
     transactions listed in clauses (x), (y), and (z) above shall not include
     CoreStates or any of its Affiliates; then, and in each such case (except as
     may be contemplated by Section 13(d) hereof), proper provision shall be
     made so that:   (i) each holder of a Right, except as provided in Section
     7(e) hereof, shall thereafter have the right to receive, upon the exercise
     thereof at the then current Purchase Price in accordance with the terms of
     this Agreement, such number of validly authorized and issued, fully paid,
     nonassessable, and freely tradeable shares of Common Stock of the Principal
     Party (as such term in hereinafter defined), not subject to any liens,
     encumbrances, rights of first refusal, or other adverse claims, as shall be
     equal to the result obtained by (1) multiplying the then-current Purchase
     Price by the number of one one-hundredths of a share of Preferred Stock for
     which a Right is exercisable immediately prior to the first occurrence of a
     Section 13 Event (or, if a Section 11(a)(ii) Event has occurred prior to
     the first occurrence of a Section 13 Event, multiplying the number of such
     one one-hundredths of a share for which a Right was exercisable immediately
     prior to the first occurrence of a Section 11(a)(ii) Event by the Purchase
     Price in effect immediately prior to such


                                      C-5
<PAGE>
 
     first occurrence), and dividing that product (which, following the first
     occurrence of a Section 13 Event, shall be referred to as the "Purchase
     Price" for each Right and for all purposes of this Agreement) by (2) 50% of
     the current market price (determined pursuant to Section 11(d)(i) hereof)
     per share of the Common Stock of such Principal Party on the date of
     completion of such Section 13 Event; (ii) such Principal Party shall
     thereafter be liable for, and shall assume, by virtue of such Section 13
     Event, all the obligations and duties of the Company pursuant to this
     Agreement; (iii) the term "Company" shall thereafter be deemed to refer to
     such Principal Party, it being specifically intended that the provisions of
     Section 11 hereof shall apply only to such Principal Party following the
     first occurrence of a Section 13 Event; (iv) such Principal Party shall
     take such steps (including, but not limited to, the reservation of a
     sufficient number of shares of its Common Stock) in connection with the
     consummation of any such transaction as may be necessary to assure that the
     provisions hereof shall thereafter be applicable, as nearly as reasonably
     may be, in relation to its shares of Common Stock thereafter deliverable
     upon the exercise of the Rights; and (v) the provisions of Section(a)(ii)
     hereof shall be of no effect following the first occurrence of any Section
     13 Event."

          9.   Clause (iv) of Section 25(a) of the Rights Agreement is amended
to read as follows:

               "(iv)  to effect any consolidation or merger into or with any
     other Person (other than a Subsidiary of the Company in a transaction which
     complies with Section 11(o) hereof), or to effect any sale or other
     transfer (or to permit one or more of its Subsidiaries to effect any sale
     or other transfer), in one transaction or a series of related transactions
     of more than 50% of the assets or earning power of the Company and its
     Subsidiaries (taken as a whole) to any other Person or Persons (other than
     the company and/or any of its Subsidiaries in one or more transactions each
     of which complies with Section 11(o) hereof), provided, however, that so
     long as the Merger Agreement shall not have been terminated, such other
     Person shall not, in any such consolidation, merger, or sale or transfer of
     assets or earning power, include CoreStates or any of its Affiliates or
     Associates,"

          10.  A new Section 35 is added to the Rights Agreement, to read in its
entirety as follows:

               "Section 35.  Termination.  This Agreement shall terminate at the
                             -----------                                        
     Termination Time and all rights,


                                      C-6
<PAGE>
 
     benefits, obligations, duties and agencies created by this Agreement shall
     be terminated at such Termination Time.  All Rights issued and outstanding
     shall, at the Termination Time, cease to exist and shall be terminated
     without any payment to any holder thereof."

          11.  On or after the date hereof, each reference in the Rights
Agreement (including the Exhibits thereto) to "This Agreement," "hereunder,"
"herein" or words of like import shall mean and be a reference to the Rights
Agreement as amended hereby and all Exhibits thereto shall be deemed to be
amended to reflect the amendments made hereby.

          12.  This Amendment shall be effective as of the date of its execution
and, except as set forth herein, the Rights Agreement shall remain in full force
and effect and shall be otherwise unaffected hereby.

          13.  Capitalized terms which are used but not defined herein shall
have the meaning ascribed to such terms in the Rights Agreement.

          14.  If any term, provision, covenant, or restriction of this
Amendment is held by a court of competent jurisdiction or other authority to be
invalid, void, or unenforceable, the remainder of the terms, provisions,
covenants, and restrictions of this Amendment shall remain in full force and
effect and shall in no way be affected, impaired, or invalidated.

          15.  This Amendment shall be deemed to be a contract made under the
laws of the Commonwealth of Pennsylvania and for all purposes shall be governed
by and construed in accordance with the laws of the Commonwealth applicable to
contracts made and to be performed entirely within the Commonwealth.

          16.  This Amendment may be executed in any number of counterparts and
each of such counterparts shall for all purposes be deemed to be an original,
and all such counterparts shall together constitute but one and the same
instrument.


                                      C-7
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be duly executed, all as of the day and year first above written.

                                       MERIDIAN BANCORP, INC.             
                                                                          
                                       By_________________________________
                                                                          
                                       Attest:____________________________
                                                                          
                                                                          
                                       MERIDIAN TRUST COMPANY             
                                                                          
                                       By_________________________________
                                                                          
                                       Attest:____________________________ 
<PAGE>
 
                                                                       Exhibit D

                      FORM OF MERIDIAN AFFILIATE'S LETTER
                      -----------------------------------

                                                             _____________, 1995



CoreStates Financial Corp
Broad and Chestnut Streets
Philadelphia, Pennsylvania  19107

Meridian Bancorp, Inc.
35 North Sixth Street
Reading, Pennsylvania  19603

Gentlemen:

     Pursuant to the terms of the Agreement and Plan of Merger, dated as of
October 10, 1995 (the "Plan"), by and between CoreStates Financial Corp
("CoreStates") and Meridian Bancorp, Inc. ("Meridian"), Meridian plans to merge
with and into CoreStates (the "Merger").  As a result of the Merger, the
undersigned may receive shares of CoreStates common stock, par value $1.00 per
share (the "CoreStates Common Stock") in exchange for shares (or options on
shares) of Meridian common stock, par value $5.00 per share (the "Meridian
Common Stock").

     The undersigned hereby represents, warrants and covenants with and to
CoreStates that in the event the undersigned receives any CoreStates Common
Stock as a result of the Merger:

          (A) The undersigned will not sell, transfer or otherwise dispose of
such CoreStates Common Stock unless (i) such sale, transfer or other disposition
has been registered under the Securities Act of 1933, as amended (the "Act"),
(ii) such sale, transfer or other disposition is made in conformity with the
provisions of Rule 145 under the Act (as such rule may be hereafter from time to
time be amended), or (iii) in the opinion of counsel in form and substance
reasonably satisfactory to CoreStates, or under a "no-action" letter obtained by
the undersigned from the staff of the Securities and Exchange


                                      D-1
<PAGE>
 
Commission (the "SEC"), such sale, transfer or other disposition will not
violate or is otherwise exempt from registration under the Act.

          (B) The undersigned understands that CoreStates is under no obligation
to register the sale, transfer or other disposition of shares of CoreStates
Common Stock by the undersigned or on the undersigned's behalf under the Act or
to take any other action necessary in order to make compliance with an exemption
from such registration available.

          (C) The undersigned also understands that stop transfer instructions
will be given to CoreStates's transfer agent with respect to the shares of
CoreStates Common Stock issued to the undersigned as a result of the Merger and
that there will be placed on the certificates for such shares, or any
substitutions therefor, a legend stating in substance:

     "The shares represented by this certificate were issued in a transaction to
     which Rule 145 under the Securities Act of 1933 applies.  The shares
     represented by this certificate may only be transferred in accordance with
     the terms of a letter agreement between the registered holder hereof and
     CoreStates, a copy of which agreement is on file at the principal offices
     of CoreStates."

          (D) The undersigned also understands that, unless the transfer by the
undersigned of the CoreStates Common Stock issued to the undersigned as a result
of the Merger have been registered under the Act or a sale made in conformity
with the provisions of Rule 145(d) under the Act, CoreStates reserves the right,
in its sole discretion, to place the following legend on the certificates issued
to any transferee of such CoreStates Common Stock from the undersigned:


                                      D-2
<PAGE>
 
     "The shares represented by this certificate have not been registered under
     the Securities Act of 1933 and were acquired from a person who received
     such shares in a transaction to which Rule 145 under the Securities Act of
     1933 applies.  The shares have been acquired by the holder not with a view
     to, or for resale in connection with, any distribution thereof within the
     meaning of the Securities Act of 1933 and may not be offered, sold, pledged
     or otherwise transferred except in accordance with an exemption from the
     registration requirements of the Securities Act of 1933."

          It is understood and agreed that the legends set forth in paragraphs
(C) and (D) above shall be removed by delivery of substitute certificates
without such legend if the undersigned shall have delivered to CoreStates (i) a
copy of a "no action" letter from the staff of the SEC, or an opinion of counsel
in form and substance reasonably satisfactory to CoreStates, to the effect that
such legend is not required for purposes of the Act, or (ii) evidence or
representations satisfactory to CoreStates that the CoreStates Common Stock
represented by such certificates is being or has been sold in a transaction made
in conformity with the provisions of Rule 145(d).

          (E) The undersigned further represents, warrants and covenants with
and to, CoreStates that the undersigned will not sell, transfer or otherwise
dispose of his or her interests in, or reduce his or her risk relative to, any
shares of CoreStates Common Stock or Meridian Common Stock beneficially owned by
the undersigned during the period commencing 30 days prior to the effective date
of the Merger and ending at such time as CoreStates notifies the undersigned
that results covering at least 30 days of combined operations of CoreStates
after the Merger have been published by CoreStates, which CoreStates agrees to
publish consistent with its normal financial reporting practice.


                                      D-3
<PAGE>
 
          (F) The undersigned further represents, warrants and covenants with
and to CoreStates that the undersigned will, and will cause each of the other
parties whose shares are deemed to be beneficially owned by the undersigned
pursuant to paragraph (G) below to, have all shares of Meridian Common Stock
owned by the undersigned or such parties registered in the name of the
undersigned or such parties, as applicable, prior to the effective date of the
Merger and not in the name of any bank, broker-dealer, nominee or clearing
house.

          (G) The undersigned understands and agrees that this letter agreement
shall apply to all shares of the capital stock of Meridian and CoreStates that
are deemed to be beneficially owned by the undersigned pursuant to applicable
federal securities laws.

          (H) The undersigned has carefully read this letter and discussed its
requirements and other applicable limitations upon the undersigned's ability to
sell, transfer or otherwise dispose of the capital stock of Meridian or
CoreStates, to the extent the undersigned felt necessary, with the undersigned's
counsel or counsel for Meridian.

                                       Very truly yours,

                                       ___________________________________
                                       Name:

                                            add below the signatures of 
                                            all registered owners of 
                                            shares deemed beneficially 
                                            owned by the affiliate

                                       ___________________________________
                                       Name:

                                       ___________________________________
                                       Name:

                                       ___________________________________
                                       Name:


                                      D-4
<PAGE>
 
          Acknowledged this ____ day of ___________, 1995.

                                       CORESTATES FINANCIAL CORP

                                       By_________________________________
                                            Name:
                                            Title:

                                       MERIDIAN BANCORP, INC.            
                                                                         
                                       By_________________________________
                                             Name:                       
                                             Title:                       


                                      D-5
<PAGE>
 
                                                                       Exhibit E

                     FORM OF CORESTATES AFFILIATE'S LETTER
                     -------------------------------------

                                                           _______________, 1995



CoreStates Financial Corp
Broad and Chestnut Streets
Philadelphia, Pennsylvania  19107

Gentlemen:

     Pursuant to the terms of the Agreement and Plan of Merger, dated as of
October 10, 1995 (the "Plan"), by and between CoreStates Financial Corp
("CoreStates") and Meridian Bancorp, Inc. ("Meridian"), Meridian plans to merge
with and into CoreStates (the "Merger").

     The undersigned hereby represents, warrants and covenants with and to
CoreStates that:

          (A) The undersigned will not sell, transfer or otherwise dispose of
his or her interests in, or reduce his or her risk relative to, any shares of
common stock of either CoreStates or Meridian beneficially owned by the
undersigned, during the period commencing 30 days prior to the effective date of
the Merger and ending at such time as CoreStates notifies the undersigned that
results covering at least 30 days of combined operations of CoreStates after the
Merger have been published by CoreStates.

          (B) The undersigned understands and agrees that this letter agreement
shall apply to all shares of the capital stock


                                      E-1
<PAGE>
 
of Meridian and CoreStates that are deemed to be beneficially owned by the
undersigned under applicable federal securities law.

                                       Very truly yours,
                                                        
                                       ___________________________________
                                       Name:                              
                                                                          
                                             add below the signatures of 
                                             all registered owners of 
                                             shares deemed beneficially 
                                             owned by the affiliate

                                       ___________________________________ 
                                       Name:                               
                                                                           
                                       ___________________________________ 
                                       Name:                               
                                                                           
                                       ___________________________________ 
                                       Name:                               

          Acknowledged this ____ day of ____________, 1995.

                                       CORESTATES FINANCIAL CORP.

                                       By_________________________________
                                             Name:                       
                                             Title:                       


                                      E-2
<PAGE>
 
                                                                       Exhibit F

                              SUMMARY TERM SHEET
                             TERMINATION AGREEMENT


1.   PARTIES

     .    [Executive] and Meridian Bancorp, Inc. (to be assumed by CoreStates).

2.   TERM

     .    3 years from date of Corestates/Meridian closing.

3.   POSITION

     .    Samuel A. McCullough - President and Chief Operating Officer,
          CoreStates Financial Corp.

     .    David E. Sparks - Chief Financial Officer, CoreStates Financial Corp.

4.   TERMINATION BY CORESTATES FOR DISABILITY

     .    30 days' notice required by CoreStates.

     .    Annual payment for a period of one year of the following compensation
          and benefits:

          .    Highest base salary during the year of termination or the
               preceding 2 years (including periods employed by Meridian),
               payable in accordance with pay policies.

          .    Greater of:  (i) highest bonus over current and preceding 2
               years, or (ii) highest annual bonus received from Meridian with
               respect to calendar years 1992-1994.

          .    Highest amounts contributed to any tax-qualified defined
               contribution plans (other than own contributions) in the year of
               termination or the 3 preceding years (including periods employed
               by Meridian), payable annually.

          .    Highest amount contributed to any supplemental salary reduction
               plan, defined contribution portion of a retirement restoration
               plan and other nonqualified plans (other than own contributions)
               in the year of termination or the 3 preceding years (including
               periods employed by Meridian), payable annually.


                                      F-1
<PAGE>
 
          .  Continuation of welfare benefit plan participation or tax-effected
               payments in lieu thereof.

          .    Accrual of additional benefits under any retirement plan, SERP,
               and defined benefit portion of a retirement restoration plan
               based on highest compensation in current and preceding 3 years
               (including periods employed by Meridian), payable in accordance
               with plans.

     .    Pro ration of payments and benefits as required.

     .    Offset for any amounts/benefits payable under any CoreStates
          disability plan.

     .    Other provisions for termination of welfare benefits and disposition
          of benefits in the event of death.

5.   DEATH WHILE EMPLOYED

     .    Basically, the same compensation and benefits as set forth in Item #4
          above -- payable to surviving spouse or estate.

6.   TERMINATION BY CORESTATES FOR CAUSE

     .    Definition of "cause" attached.

     .    30 days' notice required of CoreStates.

     .    He receives only accrued but unpaid base compensation.

     .    Termination must be effected by Board.

7.   TERMINATION BY HIM WITHOUT GOOD REASON

     .    Definition of "good reason" attached.

     .    He is required to give 30 days' notice.

     .    He receives only accrued but unpaid base compensation.

8.   TERMINATION BY CORESTATES WITHOUT CAUSE

     .    30 days' notice required of CoreStates.

     .    Compensation and benefits basically parallel those set forth under
          Item #4 above, except for three years.

9.   TERMINATION BY HIM FOR GOOD REASON

     .    30 days' notice required of him.



                                      F-2
<PAGE>
 
     .    Compensation and benefits basically parallel those set forth under
          Item #4 above, except for three years.

10.  LIMITATION ON BENEFITS

     .    Notwithstanding the foregoing provisions of the Agreement, the present
          value of the payments and benefits, under the agreement, when
          aggregated with any other payments or benefits to him which constitute
          parachute payments (within the meaning of Code Section 280G) shall in
          no event exceed 2.99 times the execution "base amount" (as determined
          under Code Section 280G).  To the extent payments or benefits are
          reduced hereunder, he may designate which payments or benefits shall
          be reduced.  In the event he fails to make such designation in a
          reasonably timely fashion, CoreStates shall be entitled to do so.

11.  PAYMENT OF HIS FEES AND EXPENSES RELATING TO AGREEMENT

     .    CoreStates is required to reimburse him for his fees and expenses
          incurred in connection with the agreement, except where an arbitration
          panel or court determines he instituted an action or otherwise acted
          in bad faith.

12.  OFFSET FOR SEVERANCE PAY

     .    Termination payments and benefits are offset by amounts received by
          him under any severance policy.

13.  NO MITIGATION

     .    No mitigation of damages is required or permitted following his
          termination of employment.

14.  CONFIDENTIALITY

     .    In all cases, he is precluded from disclosing confidential information
          following termination.

15.  ARBITRATION

     .    Provision is made for mandatory arbitration of disputes, subject to
          the right of CoreStates to secure an injunction, etc. in court for
          proscribed conduct on his part.

16.  EFFECT ON RELATED AGREEMENTS

     .    Other agreements are superseded to the extent they limit, qualify,
          duplicate, or are inconsistent with this agreement.


                                      F-3
<PAGE>
 
                              ABBREVIATED GLOSSARY

          "Cause" means (i) a documented repeated and willful failure by the
Executive to perform his duties, after written demand, (ii) his unappealable
conviction of a felony, or (iii) the issuance by the federal regulators of
CoreStates of unappealable orders to the effect that he be permanently
discharged.

For purposes of this definition, no act or failure to act on the part of the
Executive shall be considered "willful" unless done or omitted not in good faith
and without reasonable belief that the action or omission was in the best
interest of CoreStates or any of its Subsidiaries.

          "Good Reason" means:

               (i)  a demotion in the Executive's status or position immediately
     after the CoreStates/Meridian closing, or any material diminution in his
     duties or responsibilities (which are customary for the position of the
     executive set forth above); removal from office of chair will be a demotion
     in status and position.

               (ii)  a reduction in the Executive's base compensation, other
     than a reduction which is proportionate to a company-wide reduction in
     executive pay by CoreStates;

               (iii)  a failure to increase the Executive's base compensation,
     consistent with his performance rating, by the earlier of (A) the
     expiration of the normal salary adjustment cycle from time to time in
     effect, or (B) 24 months since the last increase, other than similar
     treatment on a company-wide basis for CoreStates executives or a voluntary
     deferral by him of an increase;

               (iv)  a failure (unless such failure is attributable to job
     performance) to award Executive bonuses consistent in amount with bonuses
     awarded to other Corestates Executives in the office of the Chairman; or

               (v)  any material breach of the agreement.


                                      F-4
<PAGE>
 
                                                                       Exhibit G

                             TERMINATION AGREEMENT
                             ---------------------

          THIS AGREEMENT made as of this ____ day of October, 1995, by and
between MERIDIAN BANCORP, INC. ("Meridian"), a Pennsylvania business corporation
having its principal office at 35 North Sixth Street, Reading, Berks County,
Pennsylvania, and _____________ (the "Executive"), an adult individual.

                                   WITNESSETH
                                   ----------

          WHEREAS, the Executive is presently serving as an executive of
Meridian; and

          WHEREAS, Meridian considers the continued services of the Executive to
be in the best interests of Meridian and its stockholders and desires to induce
the Executive to remain in the employ of Meridian; and

          WHEREAS, Meridian and CoreStates Financial Corp (the "Company") have
entered into an Agreement and Plan of Merger (the "Merger") and Meridian and the
Company wish to provide a Termination Agreement to Executive, contingent upon
completion of the Merger; and

          WHEREAS, the Company, as successor by Merger to Meridian wishes to
provide the Termination Payments to Executives in the circumstances set forth in
this Agreement.

                                   AGREEMENT:
                                   --------- 

          NOW, THEREFORE, the parties hereto, intending to be legally bound,
hereby agree as follows:

          1.   Term of Agreement.
               ----------------- 

               (a) This Agreement shall be for a three (3) year period
commencing on the Effective Date of the Merger (the "Effective Date") and ending
on the third anniversary of the Effective Date.

               (b) Notwithstanding the provisions of Section 1(a) of this
Agreement, this Agreement shall terminate automatically upon termination by the
Company of the Executive's employment for Cause. As used in this Agreement,
"Cause" shall mean (A) the Executive's conviction of or plea of guilty or nolo
contendere to a felony or the actual incarceration of the Executive for a period
of forty-five (45) consecutive days, (B) the issuance by any federal or state
banking authority of an order directing that the Company terminate the
Executive's employment with the Company or relieve the Executive of the duties
being performed by the Executive for the Company or


                                      G-1
<PAGE>
 
(C) Executive's willful misconduct or gross negligence in the performance of
Executive's duties.

If the Executive's employment is terminated for Cause, the Executive's rights
under this Agreement shall cease as of the effective date of such termination.

               (c) Notwithstanding the provisions of Section 1(a) of this
Agreement, this Agreement shall terminate automatically upon termination of the
Executive's employment as a result of the Executive's voluntary termination
(other than in accordance with Section 2 of this Agreement), retirement at the
Executive's election, or death and the Executive's rights under this Agreement
shall cease as of the date of such voluntary termination, retirement at the
Executive's election, or death; provided, however, that if the Executive dies
after a Notice of Termination (as defined in Section 2 of this Agreement) is
delivered by the Executive, the provisions of Section 8(b) of this Agreement
shall apply.

               (d) Notwithstanding the provisions of Section 1(a) of this
Agreement, this Agreement shall terminate automatically upon termination of the
Executive's employment as a result of the Executive's disability and the
Executive's rights under this Agreement shall cease as of the date of such
termination; provided, however, that, if the Executive becomes disabled after a
Notice of Termination (as defined in Section 2 of this Agreement) is delivered
by the Executive, the Executive shall nevertheless be absolutely entitled to
receive all of the compensation and benefits provided for in, and for the term
set forth in, Section 3 of this Agreement. For purposes of this Agreement,
"disability" shall mean the Executive's incapacitation by accident, sickness, or
otherwise which renders the Executive mentally or physically incapable of
performing the services required of the Executive for three hundred sixty (360)
consecutive days.

          2.   Termination Provisions.  If at any time during the term of this
               ----------------------                                         
Agreement, there shall be:

               (i)  any involuntary termination of the Executive (other than as
     set forth in Section 1(b), 1(c), or 1(d) of this Agreement);

               (ii)  the assignment to the Executive of duties materially
     inconsistent with the Executive's office immediately after the Effective
     Date or as the same may be increased from time to time after the Effective
     Date;

               (iii)  any reassignment of the Executive to a location greater
     than one hundred (100) miles from such Executive's current job location;


                                      G-2
<PAGE>
 
               (iv)  any reduction in excess of 10 percent in the sum of
     Executive's annual base salary and target bonus in effect on the Effective
     Date or as the same may be increased from time to time after the Effective
     Date;

               (v)  any failure to provide the Executive with a target bonus
     comparable to similarly situated executives at the Company;

               (vi)  any failure to provide the Executive with benefits at least
     as favorable as those enjoyed by similarly situated executives at
     CoreStates under CoreStates's pension, life insurance, medical, health and
     accident, disability or other employee plans;

               (vii)  any requirement that the Executive travel in performance
     of Executive's duties on behalf of the Company for a significantly greater
     period of time during any year than was required of the Executive during
     the year preceding the year in which the Effective Date occurred;

               (viii)  any material breach of this Agreement on the part of the
     Company;

then, at the option of the Executive, exercisable by the Executive within ninety
(90) days after the occurrence of each and every of the foregoing events, the
Executive may resign from employment with the Company (or, if involuntarily
terminated, give notice of intention to collect benefits under this Agreement)
by delivering a notice in writing (the "Notice of Termination") to the Company
and the provisions of Section 3 of this Agreement shall apply.

          3.   Rights in Event of Termination.
               ------------------------------ 

               (a) In the event that the Executive delivers a Notice of
Termination to the Company in accordance with Section 2 above, the Executive
shall be entitled to receive the compensation and benefits set forth below for
the remaining term of this Agreement, but not exceeding twenty-four (24) months,
as follows:

               (i)  the Executive shall continue to receive payments of annual
     base salary at the highest amount in effect during the three (3) calendar
     years preceding the year in which the Notice of Termination is delivered,
     payable in the same manner as salaries paid to other executive employees of
     the Company;

               (ii)  the Executive shall receive, no later than the fifth (5th)
     calendar day of each month, an amount equal to one-twelfth (1/12) of
     the annual dollar amount the Executive would have received under the
     Meridian Bancorp, Inc. Executive Annual Incentive Plan, based on the


                                      G-3
<PAGE>
 
     Executive's annual base salary in effect during, and based on the target
     percentage award of annual base salary under such Plan during, the calendar
     year in which the Effective Date occurs;

               (iii)  the Executive shall receive, no later than the fifth (5th)
     calendar day of each month, an amount equal to one-twelfth (1/12) of
     the amount of the contribution made by the Company to the Meridian Bancorp,
     Inc. Savings Plan, or any successor plan, on behalf of the Executive for
     the calendar year prior to the year in which the Notice of Termination is
     delivered;

               (iv)  the Executive shall be entitled to continue to participate
     in the Meridian Bancorp, Inc. Employee's Retirement Plan and the Meridian
     Bancorp, Inc. Retirement Restoration Plan, or any other supplemental
     executive retirement plan or other plan in effect during the term of this
     Agreement designed to supplement payments made under the Meridian
     Employee's Retirement Plan or any successor plan, as if the Executive's
     employment had not terminated; and

               (v)  the Company shall provide the Executive with life,
     disability, and medical insurance benefits at levels equivalent to the
     levels to which Executive would have been entitled had the Executive
     remained in the Company's employ during such period.

               (b) In the event that the Executive is ineligible to continue
participation in the Meridian Employee's Retirement Plan (and any successor
plan) or in any of the life, disability, or medical insurance plans or programs
referred to in Section 3(a) of this Agreement, the Company shall, in lieu of
such participation, pay the Executive a dollar amount equal to the dollar amount
of the benefit forfeited by the Executive as a result of such ineligibility in
the case of the Retirement Plan or a dollar amount equal to the cost to the
Executive to obtain such benefits in the case of any life, disability, or
medical insurance plans or programs.

               (c) The Company shall pay to the Executive all legal fees and
expenses incurred by the Executive as a result of the Executive's delivery of a
Notice of Termination (including all such fees and expenses, if any, incurred in
contesting or disputing any termination of employment or in seeking to obtain or
enforce any right or benefit provided by this Agreement); unless a court
determines an Executive instituted an action or otherwise acted in bad faith.

               (d) The Executive shall not be required to mitigate the amount of
any payment provided for in this Section 3 by seeking other employment or
otherwise, nor shall the amount of any payment or benefit provided for in this
Section 3 be reduced 


                                      G-4
<PAGE>
 
by any compensation earned by the Executive as the result of employment by
another employer or by reason of the Executive's receipt of or right to receive
any retirement or other benefits after the date of termination of employment or
otherwise; provided, however, that the payments provided for in this Section 3
shall be reduced by the amount actually received by the Executive under the
severance policy of the Company then in effect.

               (e) The Executive's right to receive payments under this
Agreement shall not decrease the amount of, or otherwise adversely affect, any
benefits payable to the Executive under any plan, agreement, or arrangement
relating to employee benefits provided by the Company.

               (f) Notwithstanding the foregoing provisions of this Section 3,
the present value (determined in accordance with the provisions of Section 280G
of the Internal Revenue Code of 1986, as amended (the "Code") of the total
amount of all payments under this Section 3 when aggregated with any other
payments to Executive which constitute parachute payments (within the meaning of
Section 280G of the Code) shall in no event exceed 2.99 times the Executive's
"base amount" (as determined under Section 280G of the Code).

          4.   Notices.  Except as otherwise provided in this Agreement, any
               -------                                                      
notice required or permitted to be given under this Agreement shall be deemed
properly given if in writing and if mailed by registered or certified mail,
postage prepaid with return receipt requested, to the Executive's residence, in
the case of notices to the Executive, and to the principal office of the
Company, Attention: General Counsel, in the case of notices to the Company.

          5.   Waiver.  No provision of this Agreement may be modified, waived,
               ------                                                          
or discharged unless such waiver, modification, or discharge is agreed to in
writing and signed by the Executive and the Company.  No waiver by either party
hereto at any time of any breach by the other party hereto of, or compliance
with, any condition or provision of this Agreement to be performed by such other
party shall be deemed a waiver of similar or dissimilar provisions or conditions
at the same or at any prior or subsequent time.

          6.   Assignment.  This Agreement shall not be assignable by either
               ----------                                                   
party, except by the Company to any successor in interest to the Company's
business.

          7.   Entire Agreement.  This Agreement contains the entire agreement
               ----------------                                               
of the parties relating to the subject matter of this Agreement.


                                      G-5
<PAGE>
 
          8.   Successors; Binding Agreement.
               ----------------------------- 

               (a) The Company will require 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 Company to expressly
assume and agree to perform this Agreement in the same manner and to the same
extent that the Company would be required to perform it if no such succession
had taken place.  Failure by the Company to obtain such assumption and agreement
prior to the effectiveness of any such succession shall constitute a breach of
this Agreement and the provisions of Section 3 of this Agreement shall apply.
As used in this Agreement, "Company" shall mean the Company as defined
previously and any successor to its business and/or assets as aforesaid which
assumes and agrees to perform this Agreement by operation of law or otherwise.

               (b) This Agreement shall inure to the benefit of and be
enforceable by the Executive's personal or legal representatives, executors,
administrators, heirs, distributees, devisees, and legatees. If the Executive
should die after a Notice of Termination is delivered by the Executive and any
amounts would be payable to the Executive under this Agreement if the Executive
had continued to live, all such amounts shall be paid in accordance with the
terms of this Agreement to the Executive's devisee, legatee, or other designee,
or, if there is no such designee, to the Executive's estate.

          9.   Validity.  The invalidity or unenforceability of any provision of
               --------                                                         
this Agreement shall not affect the validity or enforceability of any other
provision of this Agreement, which shall remain in full force and effect.

          10.  Applicable Law.  This Agreement shall be governed by and
               --------------                                          
construed in accordance with the domestic laws (but not the law of conflicts of
law) of the Commonwealth of Pennsylvania.

          11.  Headings.  The headings of the Sections of this Agreement are for
               --------                                                         
convenience only and shall not control or


                                      G-6
<PAGE>
 
affect the meaning or construction or limit the scope of intent of any of the
provisions of this Agreement.

          IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.

                                       MERIDIAN BANCORP, INC.            
                                                                         
                                       By________________________________
                                             Chairman of the Board       
(SEAL)                                                                   
                                       Attest:___________________________
                                                       Secretary         
                                                                         
Witness:                                                                 
                                                                         
__________________________             _____________________________(SEAL)
                                                                         
                                             ("Executive")                


                                      G-7
<PAGE>
 
                                                                       Exhibit H

                           EXECUTIVE SEVERANCE POLICY
                                       OF
               MERIDIAN BANCORP, INC. AND PARTICIPATING COMPANIES


     1.   Purpose.  The purpose of this Policy is to provide for the payment of
          -------                                                              
severance and the continuation of certain benefits for eligible executives of
Meridian Bancorp, Inc. and other Participating Companies under the circumstances
described below.

     2.   Definitions.  Each capitalized word and term used herein shall have
          -----------                                                        
the meaning ascribed to it, if any, in the glossary appended hereto, unless the
context in which such word or term is used otherwise clearly requires.  Such
glossary is incorporated herein by reference and made a part hereof.

     3.   Eligible Individuals.
          -------------------- 

          (a)  Persons eligible for participation in this Policy are (i)
               executive employees of the Participating Companies who are
               employed in a salary grade of 22 or higher, and (ii) such other
               employees of the Participating Companies (not to exceed 12 in
               number at any given time) designated in writing by Meridian's
               Chief Executive Officer as Participants; provided, however, that
               no such person shall be designated who does not appear to qualify
               as a member of "a select group of management or highly
               compensated employees" under U.S. Department of Labor Regulations
               promulgated under ERISA.  For purposes of this paragraph, in the
               event the job classification system is hereafter changed, "salary
               grade 22" shall be deemed such grade or rank as, in the judgment
               of the senior Human Resources officer, most nearly approximates
               the prior "salary grade 22."

          (b)  Prior to a Change in Control, an individual shall cease to be a
               Participant as of (i) the effective date of any demotion to a
               salary grade less than 22, unless designated as a Participant
               under the provisions of Paragraph 3(a)(ii), and (ii) in the case
               of an individual described in Paragraph 3(a)(ii), the effective
               date specified in any written notice, delivered to such
               individual by the Chief Executive Officer of Meridian, or his
               designee, providing for such cessation of participation.

          (c)  After a Change in Control, no individual who was a Participant at
               such time shall cease to be a Participant for any reason prior to
               termination of


                                      H-1
<PAGE>
 
               employment; provided, however, that no such individual shall be
               entitled to Policy benefits except in the event of his or her
               termination of employment under circumstances qualifying
               therefor.

     4.   Terminations of Employment Qualifying and Not Qualifying for Policy
          -------------------------------------------------------------------
Benefits.  A Participant shall be entitled to receive Policy benefits upon his
- --------                                                                      
or her termination of employment, except in the case of:

          (a)  the voluntary termination of employment by the Participant,
               whether by reason of retirement or otherwise, including, in the
               case of a Participant who has been advised of his or her pending
               involuntary termination under circumstances that would otherwise
               qualify for Policy benefits, voluntary termination prior to
               actual termination by his or her employer;

          (b)  the termination of the Participant by the Company for Cause;

          (c)  the transfer of the Participant by the Company to another
               Participating Company;

          (d)  the termination of the Participant by the Company following the
               refusal by the Participant to accept a demotion, reassignment, or
               transfer of employment to another Participating Company;
               provided, however, that following a Change in Control, this
               subparagraph shall not apply unless the offered employment
               constitutes a Reasonable Job Offer;

          (e)  the termination of the Participant by the Company if he or she
               receives a Reasonable Job Offer in connection therewith (whether
               or not accepted);

          (f)  the termination of the Participant by reason of his or her death;
               or

          (g)  the termination of the Participant as a result or following the
               incurrence of a disability, if such Participant is entitled to
               disability benefits under a long-term disability plan of the
               Company.

Notwithstanding the preceding provisions of this paragraph, in the case of a
proposed demotion, reassignment or transfer of a Participant to a Participating
Company following a Change in Control, if the offered employment does not
constitute a Reasonable Job Offer, then such Participant shall be entitled to
refuse to accept such demotion, reassignment or transfer and to


                                      H-2
<PAGE>
 
terminate his or her employment, in which event he or she shall be entitled to
Policy benefits provided hereunder.
 
     5.   Policy Benefits in General.  The following Policy benefits will be
          --------------------------                                        
provided to a Participant whose employment terminates under circumstances making
him or her eligible therefor:

          (a)  The payment in one lump sum, within 30 days following termination
               of employment, of such individual's Base Salary times a number of
               months not less than 12 nor more than 24, and determined pursuant
               to the provisions of Paragraph 6 or the following sentence.  The
               participants in the executive severance policy in effect
               immediately prior to the Effective Date shall initially continue
               as Participants hereunder, and the number of months applicable to
               each shall be as set forth in written communications previously
               delivered to them by the senior Human Resources officer, or his
               designee.

          (b)  The payment in one lump sum, within 30 days following termination
               of employment, of an amount equal to (i) one-twelfth (1/12) of
               the highest Annual Bonus awarded to such individual with respect
               to any of Meridian's three fiscal years ended prior to the fiscal
               year in which termination occurs, times (ii) the number of months
               applicable to such individual under Paragraph 5(a).

          (c)  The periodic payment, at Company expense, of the cost of COBRA
               continuation coverage for health insurance for the lesser of (i)
               the number of months applicable to such individual under
               Paragraph 5(a), or (ii) the required number of months of such
               continuation coverage under ERISA.  To the extent the number of
               months in Clause (i) is greater than the number of months in
               Clause (ii), the Company will continue to provide the same dollar
               amount towards conversion coverage as before the expiration of
               the COBRA period.  Notwithstanding the foregoing, however, the
               obligation to provide the benefit described in this subparagraph
               shall terminate as of the date the Participant becomes covered
               under a group health plan or Medicare under circumstances which
               terminate his or her right to COBRA continuation coverage (or
               would so terminate such coverage, if it were applicable).

          (d)  To the extent not otherwise covered by this Policy and relevant
               to such individual, such additional


                                      H-3
<PAGE>
 
               benefits as would be provided to or on behalf of such individual
               if he or she were participating under the Company's general
               severance policy then in effect.  In no event, however, shall a
               Participant be entitled to an installment payment of Base Salary
               and annual bonus.

     6.   Equivalent Months of Benefit.  The number of months of Base Salary to
          ----------------------------                                         
which a Participant may become entitled shall be as set forth in any written
communication which may be sent to such Participant by Meridian's Chief
Executive Officer, or his designee.  In default of such communication, such
number shall be 12.  Such number may from time to time be increased, but it may
not be decreased (whether or not previously increased), except in the case of
termination of participation.  The number of months applicable to Meridian's
Chief Executive Officer shall at all times be 24.

     7.   Rights Under Company Plans.  Except as otherwise provided herein, a
          --------------------------                                         
Participant's rights under any pension or welfare benefit plan of the Company
shall be unaffected by the receipt of benefits under this Policy; provided,
however, that no amounts payable under this Policy shall be treated as
compensation under such plans unless and to the extent such plans may otherwise
provide.

     8.   Primary and Secondary Obligors.  The right of a terminated Participant
          ------------------------------                                        
to receive Policy benefits shall be the primary obligation of his or her
employer at the time of termination.  In the event such employer (other than
Meridian) is financially unable to discharge such obligation, Meridian shall do
so.

     9.   Preclusion Against Multiple Benefits.  It is not the intent of this
          ------------------------------------                               
Policy to provide benefits that would constitute a windfall to any individual.
Rather, the Policy is intended to ease the transition of a terminated
Participant toward new employment.  For this reason, notwithstanding anything
herein to the contrary, in no event will benefits be paid hereunder to the
extent a Participant is entitled to severance benefits under a contract,
agreement, or severance policy or plan with the Company, or any Successor
thereto, or any business of which the Company is directly or indirectly a
Successor, providing for identical or similar benefits, unless such contract,
agreement, or severance policy or plan provides for the reduction of benefits
thereunder paid under this Policy.  However, in the event the aggregate value of
benefits otherwise payable hereunder exceed those provided for under such a
severance arrangement that does not provide for such a reduction, the excess
value of benefits payable hereunder shall be paid in such form as the senior
Human Resource officer shall reasonably designate.
 
     10.  Amendment and Termination.  Prior to a Change in Control, this Policy
          -------------------------                                            
may be amended or terminated by the Board of


                                      H-4
<PAGE>
 
Directors of Meridian at any time and from time to time; provided, however, that
no such amendment or termination shall adversely affect the rights of a
Participant who has therefore become entitled to Policy benefits by reason of
his or her termination of employment.  Following a Change in Control, this
Policy may not be amended or terminated for a period of two years, unless: (i)
it is replaced with a policy or plan providing equivalent or more favorable
terms, conditions and benefits, (ii) Participants are made eligible for
severance benefits under another existing policy or plan which provides for
equivalent or more favorable terms, conditions and benefits, (iii) in the case
of termination, such termination is required by law, or (iv) in the case of
amendment, only if such amendment is required by law and only to the extent so
required.

     11.  Withholding and Related Matters.  The Company is authorized to
          -------------------------------                               
withhold from Policy benefits taxes (including excise taxes) and such other
amounts as may be required by law.  In addition, as a condition to the receipt
of Policy benefits each Participant shall be deemed to have consented and agreed
to remit to the Company such amounts as may be needed by it to discharge its
withholding obligations.

     12.  Effect on Prior Executive Severance Policy.  This Policy shall
          ------------------------------------------                    
supersede Meridian's executive severance policy heretofore in effect and such
policy shall be deemed terminated, except for purposes of making payments
required thereunder to eligible persons who terminated prior to the Effective
Date of this Policy.

     13.  Administration of Policy.  Except as otherwise provided herein, this
          ------------------------                                            
Policy shall be construed, enforced and administered by Meridian's senior Human
Resources officer.  In the event a matter arises under the Policy relating
specifically to the senior Human Resources officer, this Policy shall be
construed, enforced and administered as to such officer by Meridian's Chief
Executive Officer.  Meridian shall cause to be implemented such claims procedure
as may be required by law to ensure that any Participant who is denied Policy
benefits, in whole or in part, receives fair consideration of any claim for
benefits.

     14.  Status of Participant as Creditor.  Benefits under the Policy shall be
          ---------------------------------                                     
paid from the general assets of the relevant Company.  As such, each Participant
shall be a general unsecured creditor with respect to his or her entitlement to
Policy benefits.

     15.  No Contract of Employment.  This Policy shall not constitute a
          -------------------------                                     
contract of employment, and participation herein shall not give any individual
the right to be retained in the employ of a Participating Company or any
business entity directly or indirectly related to a Participating Company.


                                      H-5
<PAGE>
 
     16.  Assignment, Alienation, Etc. of Policy Benefits.  Except as otherwise
          -----------------------------------------------                      
required by applicable law, the right of a Participant to Policy benefits shall
not be voluntarily or involuntarily assigned, transferred, pledged, encumbered,
or attached.

     17.  Captions.  The captions of the several paragraphs of this Policy
          --------                                                        
document are inserted for convenience of reference only and shall not be
considered in the construction hereof.

     18.  Number.  Wherever any word is used herein in the singular form, it
          ------                                                            
shall be construed as though it were used in the plural form, as the context
requires, and vice versa.

     19.  Gender.  A masculine, feminine or neuter pronoun, wherever used
          ------                                                         
herein, shall be construed to include all genders, as the context requires.

     20.  Severability.  In the event any provision in this Policy document
          ------------                                                     
shall be held illegal or invalid for any reason, such illegal or invalid
provision shall not affect the remaining provisions hereof, and this Policy
document shall be construed, enforced and administered as if such illegal or
invalid provision were not contained herein.

     21.  Applicable Law.  Except to the extent preempted by federal law, this
          --------------                                                      
Policy document shall be construed, enforced and administered in accordance with
the domestic internal law of the Commonwealth of Pennsylvania.

     22.  Binding Effect.  This Policy shall be binding upon Meridian, the other
          --------------                                                        
Participatory Companies, and their respective successors and assigns.

     23.  No Waiver.  The failure of any Participating Company or a
          ---------                                                
Participant to promptly exercise any right under this Policy shall not be
construed as a waiver of such right or any similar right that may thereafter
arise, except to the extent otherwise agreed in writing.


                                      H-6
<PAGE>
 
                                    GLOSSARY

          "Annual Bonus" means a bonus paid to a Participant by a Participating
Company with respect to a fiscal year of 12 months pursuant to the Company's
Executive Annual Incentive Plan or any other formal and recurring bonus plans or
arrangements of the Company.  In the case of a bonus paid with respect to a
lesser period, such bonus shall be annualized and the resulting amount shall be
treated as an Annual Bonus.

          "Bank" means Meridian Bank, a Pennsylvania bank and trust company, and
any successor thereto.

          "Base Salary" means the monthly base salary (before any salary
reduction) being paid to a Participant by a Participating Company immediately
prior to his or her termination of employment.

          "Board of Directors" means the board of directors of the relevant
corporation.

          "Cause" means:

               (a)  prior to a Change in Control --

                    (i)  repeated unsatisfactory work performance following 
               written communication of specific deficiencies by an individual's
               immediate supervisor, coupled with the written concurrence with
               the supervisor's appraisal of such performance by the Company's
               senior Human Resources officer;

                    (ii)  a documented repeated and willful failure by the
               Participant to perform his or her duties, but only after written
               demand and only if termination is effected following action taken
               by a vote of at least a majority of the directors of Meridian
               then in office;

                   (iii)  the commission of any act of dishonesty against
               Meridian, any direct or indirect Subsidiary of Meridian, or any
               business entity affiliated with Meridian or a Subsidiary of
               Meridian;

                    (iv)  the violation of any written code of conduct
               applicable to Company employees generally or officers
               specifically;

                    (v)  an unappealable conviction of a felony or other act
               constituting a misdemeanor which act is likely to cause one or
               more of the Participating Companies embarrassment in the
               financial or relevant local community; or


                                      H-7
<PAGE>
 
                    (vi)  the issuance by a federal or state regulator of an
               unappealable order to the effect that a Participant be
               permanently discharged; and

               (b) upon or following a Change in Control --

                    (i)  a documented repeated and willful failure by the
               Participant to perform his or her duties, but only after written
               demand and only if termination is effected following action taken
               by a vote of at least 80% of the nonofficer directors of Meridian
               then in office;

                    (ii)  the commission of any act of dishonesty against
               Meridian, any direct or indirect Subsidiary of Meridian, or any
               business entity affiliated with Meridian or a Subsidiary of
               Meridian;

                    (iii)  the violation of any written code of conduct
               applicable to Company employees generally or officers
               specifically;

                    (iv)  an unappealable conviction of a felony or other act
               constituting a misdemeanor which act is likely to cause one or
               more of the Participating Companies embarrassment in the
               financial or relevant local community; or

                    (v)  the issuance by a federal or state regulator of an
               unappealable order to the effect that a Participant be
               permanently discharged.

     "Change in Control" means the occurrence of any of the following events:

                    (a) any Person (except (i) Meridian or any Subsidiary of
     Meridian, or (ii) any Employee Benefit Plan (or any trust forming a part
     thereof) maintained by Meridian or any Subsidiary of Meridian) is or
     becomes the beneficial owner, directly or indirectly, of Meridian's
     securities representing 19.9% or more of the combined voting power of
     Meridian's then outstanding securities, other than pursuant to a
     transaction described in Clause (c);

                    (b) there occurs a sale, exchange, transfer or other
     disposition of all or substantially all of the assets of Meridian or the
     Bank to another entity, except to an entity controlled directly or
     indirectly by Meridian;

                    (c) there occurs a merger, consolidation, share exchange,
     division or other reorganization of or relating to the Meridian, unless--



                                      H-8
<PAGE>
 
                    (i)  the shareholders of Meridian immediately before such
          merger, consolidation, share exchange, division or reorganization own,
          directly or indirectly, immediately thereafter at least 66 2/3% of the
          combined voting power of the outstanding voting securities of the
          Surviving Company in substantially the same proportion as their
          ownership of the voting securities immediately before such merger,
          consolidation, share exchange, division or reorganization; and

                    (ii)  the individuals who, immediately before such merger,
          consolidation, share exchange, division or reorganization, are members
          of the Incumbent Board continue to constitute at least two-thirds of
          the Board of Directors of the Surviving Company; provided, however,
          that if the election, or nomination for election by Meridian's
          shareholders, of any new director was approved by a vote of at least
          two-thirds of the Incumbent Board, such director shall, for the
          purposes hereof, be considered a member of the Incumbent Board; and
          provided further, however, that no individual shall be considered a
          member of the Incumbent Board if such individual initially assumed
          office as a result of either an actual or threatened Election Contest
          or Proxy Contest, including by reason of any agreement intended to
          avoid or settle any Election Contest or Proxy Contest; and

                    (iii)  no Person (except (A) Meridian or any Subsidiary of
          Meridian, (B) any Employee Benefit Plan or any trust forming a part
          thereof) maintained by Meridian or any Subsidiary of Meridian, (C) the
          Surviving Company or any Subsidiary of the Surviving Company, or (D)
          any Person who, immediately prior to such merger, consolidation, share
          exchange, division or reorganization had beneficial ownership of 19.9%
          or more of the then outstanding voting securities of Meridian) has
          beneficial ownership of 19.9% or more of the combined voting power of
          the Surviving Company's outstanding voting securities immediately
          following such merger, consolidation, share exchange, division or
          reorganization;

               (d) a plan of liquidation or dissolution of Meridian, other than
     pursuant to bankruptcy or insolvency laws, is adopted;

               (e) during any period of two consecutive years, individuals who,
     at the beginning of such period, constituted the Board of Directors of
     Meridian cease for any reason to constitute at least a majority of such
     Board of Directors, unless the election, or the nomination for election by
     Meridian's shareholders, of each new director was approved by a vote of at
     least two-thirds of the


                                      H-9
<PAGE>
 
     directors then still in office who were directors at the beginning of the
     period; provided, however, that no individual shall be considered a member
     of the Board of Directors of Meridian at the beginning of such period if
     such individual initially assumed office as a result of either an actual or
     threatened Election Contest or Proxy Contest, including by reason of any
     agreement intended to avoid or settle any Election Contest or Proxy
     Contest; or

               (f) there occurs a Triggering Event.

Notwithstanding the foregoing, a Change in Control shall not be deemed to have
occurred if a Person becomes the beneficial owner, directly or indirectly, of
securities representing 19.9% or more of the combined voting power of Meridian's
then outstanding securities solely as a result of an acquisition by Meridian of
its voting securities which, by reducing the number of shares outstanding,
increases the proportionate number of shares beneficially owned by such Person;
provided, however, that if a Person becomes a beneficial owner of 19.9% or more
of the combined voting power of Meridian's then outstanding securities by reason
of share repurchases by Meridian and thereafter becomes the beneficial owner,
directly or indirectly, of any additional voting securities of the Meridian
(other than pursuant to a stock split, stock dividend or similar transaction),
then a Change in Control shall be deemed to have occurred with respect to such
Person under Clause (a).

Notwithstanding anything contained herein to the contrary, if an individual's
participation is terminated and he or she reasonably demonstrates that such
termination (i) was at the request of a third party who has indicated an
intention of taking steps reasonably calculated to effect a Change in Control
and who effects a Change in Control, or (ii) otherwise occurred in connection
with, or in anticipation of, a Change in Control which actually occurs, then for
all purposes hereof, a Change in Control shall be deemed to have occurred on the
day immediately prior to the date of such termination of participation.

     "COBRA" and references to COBRA continuation coverage mean the legal
requirement to make available, under certain circumstances, continued health
insurance coverage to certain individuals under the provisions of ERISA.

     "Company" means, as the context requires, Meridian or any Participating
Affiliated Company.

     "Effective Date" means, with respect to this Policy, _____________, 1995.

     "Election Contest" means a solicitation with respect to the election or
removal of directors that is subject to the provisions of Rule 14a-11 of the
1934 Act.


                                     H-10
<PAGE>
 
     "Employee Benefit Plan" has the meaning ascribed to such term in ERISA
Section 3(3).

     "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended and as the same may be amended from time to time.

     "Incumbent Board" means the Board of Directors of Meridian as constituted
at any relevant time.

     "Meridian" means Meridian Bancorp, Inc., a Pennsylvania corporation, and
any Successor thereto.

     "1934 Act" means the Securities Exchange Act of 1934, as amended and as the
same may be amended from time to time.

     "Participant" means an individual who is potentially entitled to Policy
benefits by reason of being described in Paragraph 3(a).

     "Participating Affiliated Company" means each corporate entity that
qualifies as an "affiliated company" under and, as of the Effective Date of this
Policy, participates in the Meridian Bancorp, Inc. Employees' Retirement Plan,
and any successor thereto.

     "Participating Companies" means Meridian and each Participating Affiliated
Company.  Such term shall also include any other business entity directly or
indirectly controlling, controlled by, or under common control with Meridian and
designated as such (with the concurrence of its Board of Directors) by
Meridian's Chief Executive Officer.  For purposes of this Policy, (i) the
employees of Meridian Capital Markets, Inc., a division of the Bank, and
Meridian Securities, Inc. shall not be deemed employees of a Participating
Company and, therefore, shall be ineligible to become Participants; provided,
however, that any individual described in the second sentence of Paragraph 5(a)
shall be eligible to participate in the Policy and, in connection with such
participation, his or her employer shall be deemed a Participating Company, and
(ii) McGlinn Capital Management, Inc. shall in no event be deemed a
Participating Affiliated Company.

     "Person" has the same meaning as such term has for purposes of Sections
13(d) and 14(d) of the 1934 Act.

     "Policy" means the Executive Severance Policy of Meridian Bancorp, Inc. and
Certain Affiliated Companies.

     "Proxy Contest" means the solicitation of proxies or consents by or on
behalf of a Person other than the Board of Directors of Meridian.


                                     H-11
<PAGE>
 
     "Reasonable Job Offer" means the offer of employment to a Participant by
any business entity, which offer was directly or indirectly arranged, induced,
facilitated or otherwise caused to be made by reason of the efforts of a
Participating Company (including, without limitation, offers made in connection
with outsourcing programs), provided (i) such offer provides for an initial base
salary or wage not less than 100% of the Participant's then Base Salary (and, in
the case of a demotion, reassignment or transfer within the affiliated group of
corporations of which the Participant is employed following a Change in Control,
the opportunity to earn an Annual Bonus consistent with prior Annual Bonuses),
(ii) the primary business location of the offered position is not more than 50
miles from his or her then primary residence and does not initially cause an
increase in such individual's one-way commuting distance of more than 20 miles,
and (iii) the entity offering the position represents to the Participant that
its then present intent is for the employment to constitute a full-time
permanent position.

     "Subsidiary" means, with respect to any corporation, any business entity of
which a majority of its voting power or its equity securities or equity
interests is owned, directly or indirectly, by such corporation.

     "Successor" means any Person that succeeds to, or has the practical ability
to control (either immediately or with the passage of time), Meridian's business
directly, by merger or consolidation, or indirectly, by purchase of Meridian's
voting securities or all or substantially all of its assets.

     "Surviving Company" means the business entity that is a resulting company
following a merger, consolidation, share exchange, division or other
reorganization of or relating to the Company.

     "Triggering Event" has the meaning ascribed to such term in the Rights
Agreement, dated as of July 25, 1989, between Meridian and Meridian Trust
Company, as the same may be amended from time to time, and any successor
agreement thereto.


                                     H-12

<PAGE>
 
                                                                   Exhibit 10(a)

                        MERIDIAN STOCK OPTION AGREEMENT
                        -------------------------------


     STOCK OPTION AGREEMENT, dated as of October 10, 1995 (the "Agreement"), by
and between MERIDIAN BANCORP, INC., a Pennsylvania corporation ("Issuer"), and
CORESTATES FINANCIAL CORP, a Pennsylvania corporation ("Grantee").

                                    RECITALS

          A.   The Plan.  Grantee and Issuer are concurrently herewith entering
               --------                                                        
into an Agreement and Plan of Merger, dated as of the date hereof (the "Plan"),
providing for, among other things, the merger of Issuer with and into Grantee,
with Grantee being the surviving corporation.

          B.  Condition to Plan.  As a condition and inducement to Grantee's
              -----------------                                             
execution of the Plan and Grantee's agreement referred to in the next sentence,
Grantee has required that Issuer agree, and Issuer has agreed, to grant Grantee
the Option (as hereinafter defined).  As a condition and inducement to Issuer's
execution of the Plan and this Agreement, Grantee and Issuer have concurrently
herewith entered into an agreement (the "CoreStates Stock Option Agreement") to
grant an option to Issuer on terms and conditions substantially identical to
those of the Option and this Agreement.

          NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth herein and in
the Plan and the CoreStates Stock Option Agreement, and intending to be legally
bound hereby, Issuer and Grantee agree as follows:

          1.   Defined Terms.  Capitalized terms which are used but not defined
               -------------                                                   
herein shall have the meanings ascribed to such terms in the Plan.

          2.   Grant of Option.  Subject to the terms and conditions set forth
               ---------------                                                
herein, Issuer hereby grants to Grantee an irrevocable option (the "Option") to
purchase a number of shares of common stock, par value $5.00 per share ("Issuer
Common Stock"), of Issuer up to 11,506,698 of such shares (as adjusted as set
forth herein, the "Option Shares," which shall include the Option Shares before
and after any transfer of such Option Shares, but in no event shall the number
of Option Shares for which this Option is exercisable exceed 19.9% of the issued
and outstanding shares of Issuer Common Stock) at a purchase price per Option
Share (as adjusted as set forth herein, the "Purchase Price") equal to $38
13/16.  Each Option Share issued upon exercise of the Option shall be
accompanied by Meridian Rights as provided in the Meridian Rights Agreement.


                                      A-1
<PAGE>
 
          3.   Exercise of Option.
               -----------------

               (a) Provided that (i) Grantee or Holder (as hereinafter defined),
as applicable, shall not be in material breach of the agreements or covenants
contained in this Agreement or, in the case of Grantee, the Plan or the
CoreStates Stock Option, and (ii) no preliminary or permanent injunction or
other order against the delivery of shares covered by the Option issued by any
court of competent jurisdiction in the United States shall be in effect, the
Holder may exercise the Option, in whole or in part, at any time and from time
to time following the occurrence of a Purchase Event (as hereinafter defined);
provided that the Option shall terminate and be of no further force or effect
upon the earliest to occur of (A) the Effective Time, (B) termination of the
Plan in accordance with the terms thereof prior to the occurrence of a Purchase
Event or a Preliminary Purchase Event (as hereinafter defined) or (C) 18 months
after termination of the Plan following the occurrence of a Purchase Event or a
Preliminary Purchase Event; provided, however, that any purchase of shares upon
exercise of the Option shall be subject to compliance with applicable law.
Notwithstanding the termination of the Option, Grantee or Holder as the case may
be, shall be entitled to purchase those Option Shares with respect to which it
has exercised the Option in accordance herewith prior to the termination of the
Option. The term "Holder" shall mean the holder or holders of the Option from
time to time, and which initially is Grantee. The termination of the Option
shall not affect any rights hereunder which by their terms extend beyond the
date of such termination.

               (b) As used herein, a "Purchase Event" means any of the 
following events:

                   (i)    Without Grantee's prior written consent, Issuer shall
     have recommended, publicly proposed or publicly announced an intention to
     authorize, recommend or propose, or entered into an agreement with any
     person (other than Grantee or any subsidiary of Grantee) to effect (A) a
     merger, consolidation or similar transaction involving Issuer or any of its
     significant subsidiaries (other than transactions solely between Issuer's
     subsidiaries that are not violative of the Plan), (B) the disposition, by
     sale, lease, exchange or otherwise, of assets or deposits of Issuer or any
     of its significant subsidiaries representing in either case 15% or more of
     the consolidated assets or deposits of Issuer and its subsidiaries or (C)
     the issuance, sale or other disposition by Issuer of (including by way of
     merger, consolidation, share exchange or any similar transaction)
     securities representing 15% or more of the voting power of Issuer or any of
     its significant subsidiaries, other than, in each case of (A), (B), or (C),
     any merger, consolidation, share exchange or similar transaction involving
     Issuer or any of its significant subsidiaries in which the voting
     securities of Issuer 


                                      A-2
<PAGE>
 
     outstanding immediately prior thereto continue to represent (by either
     remaining outstanding or being converted into the voting securities of the
     surviving entity of any such transaction) at least 65% of the combined
     voting power of the voting securities of the Issuer or the surviving entity
     outstanding immediately after the completion of such merger, consolidation,
     or similar transaction (provided any such transaction is not violative of
     the Plan) (each of (A), (B), or (C), an "Acquisition Transaction"); or

                   (ii)   any person (other than Grantee or any subsidiary of
     Grantee) shall have acquired beneficial ownership (as such term is defined
     in Rule 13d-3 promulgated under the Exchange Act) of or the right to
     acquire beneficial ownership of, or any "group" (as such term is defined in
     Section 13(d)(3) of the Exchange Act), other than a group of which Grantee
     or any subsidiary of Grantee is a member, shall have been formed which
     beneficially owns or has the right to acquire beneficial ownership of 15%
     or more of the voting power of Issuer or any of its significant
     subsidiaries; or

                   (iii)  any person (other than Grantee or any subsidiary of
     Grantee) shall have commenced (as such term is defined in Rule 14d-2 under
     the Exchange Act) or shall have filed a registration statement under the
     Securities Act, with respect to, a tender offer or exchange offer to
     purchase any shares of Issuer Common Stock such that, upon consummation of
     such offer, such person would own or control 15% or more of the then
     outstanding shares of Issuer Common Stock (such an offer being referred to
     herein as a "Tender Offer" or an "Exchange Offer," respectively); or

                   (iv)   the shareholders shall not have approved the Plan by
     the requisite vote at the Meridian Meeting, the Meridian Meeting shall not
     have been held or shall have been canceled prior to termination of the
     Plan, or Issuer's Board of Directors shall have withdrawn or modified in a
     manner adverse to Grantee the recommendation of Issuer's Board of Directors
     with respect to the Plan, in each case after it shall have been publicly
     announced that any person (other than Grantee or any subsidiary of Grantee)
     shall have (A) made, or disclosed an intention to make, a bona fide
     proposal to engage in an Acquisition Transaction, (B) commenced a Tender
     Offer or filed a registration statement under the Securities Act with
     respect to an Exchange Offer or (C) filed an application (or given a
     notice), whether in draft or final form, under the Home Owners' Loan Act,
     as amended ("HOLA"), the BHC Act, the Bank Merger Act, as amended (the
     "BMA") or the Change in Bank Control Act of 1978, as amended (the "CBCA"),
     for approval to engage in an Acquisition Transaction.


                                      A-3
<PAGE>
 
               (c) As used herein, a "Preliminary Purchase Event" means any of
the following events:

                   (i)    any person (other than Grantee or any subsidiary of
     Grantee) shall have made a bona fide proposal to Issuer or its shareholders
     by public announcement, or written communication that is or becomes the
     subject of public disclosure, to engage in an Acquisition Transaction; or

                   (ii)   after a proposal is made by a third party to Issuer or
     its shareholders to engage in an Acquisition Transaction, or such third
     party states its intention to the Issuer to make such a proposal if the
     Plan terminates, Issuer shall have breached any representation, warranty,
     covenant or agreement contained in the Plan; or

                   (iii)  any person (other than Grantee or any subsidiary of
     Grantee) other than in connection with a transaction to which Grantee has
     given its prior written consent, shall have filed an application or notice
     with any Regulatory Authority for approval to engage in an Acquisition
     Transaction; or

                   (iv)   any event entitling Grantee to terminate the Plan
     pursuant to Section 7.01(E) thereof.

As used in this Agreement, "person" shall have the meaning specified in Sections
3(a)(9) and 13(d)(3) of the Exchange Act.

               (d) Issuer shall notify Grantee promptly in writing of the
occurrence of any Preliminary Purchase Event or Purchase Event, it being
understood that the giving of such notice by Issuer shall not be a condition to
the right of Holder to exercise the Option.

               (e) In the event Holder wishes to exercise the Option, it shall
send to Issuer a written notice (the date of which being herein referred to as
the "Notice Date") specifying (i) the total number of Option Shares it intends
to purchase pursuant to such exercise and (ii) a place and date not earlier than
three business days nor later than 15 business days from the Notice Date for the
closing (the "Closing") of such purchase (the "Closing Date"); provided that if
the Closing cannot be consummated by reason of any applicable judgement, decree,
order, law or regulation, the period of time that otherwise would run pursuant
to this sentence shall run instead from the date on which such restriction on
consummation has expired or been terminated; and provided, further, without
limiting the foregoing, that if prior notification to or approval of any
Regulatory Authority is required in connection with such purchase, Issuer shall
cooperate with the Holder in the filing of the required notice of application
for approval and the obtaining of such approval and the Closing shall occur
immediately


                                      A-4
<PAGE>
 
following such regulatory approvals (and any mandatory waiting periods).  Any
exercise of the Option shall be deemed to occur on the Notice Date relating
thereto.

               (f) Notwithstanding Section 3(e), in no event shall any Closing
Date be more than 18 months after the related Notice Date, and if the Closing
Date shall not have occurred within 18 months after the related Notice Date due
to the failure to obtain any such required approval, the exercise of the Option
effected on the Notice Date shall be deemed to have expired. In the event (i)
Holder receives official notice that an approval of any other Regulatory
Authority required for the purchase of Option Shares will not be issued or
granted or (ii) a Closing Date shall not have occurred within 18 months after
the related Notice Date due to the failure to obtain any such required approval,
Grantee shall be entitled to exercise its right as set forth in Section 8 to
exercise the Option in connection with the resale of Issuer Common Stock or
other securities pursuant to a registration statement as provided in Section 9.
The provisions of this Section 3 and Section 4 shall apply with appropriate
adjustments to any such exercise.

          4.   Payment and Delivery of Certificates.
               ------------------------------------ 

               (a) On each Closing Date, Holder shall (i) pay to Issuer, in
immediately available funds by wire transfer to a bank account designated by
Issuer, an amount equal to the Purchase Price multiplied by the number of Option
Shares to be purchased on such Closing Date, and (ii) present and surrender this
Agreement to the Issuer at the address of the Issuer specified in Section 12(f).

               (b) At each Closing, simultaneously with the delivery of
immediately available funds and surrender of this Agreement as provided in
Section 4(a), (i) Issuer shall deliver to Holder (A) a certificate or
certificates representing the Option Shares to be purchased at such Closing,
which Option Shares shall be free and clear of all Liens and subject to no
preemptive rights, and (B) if the Option is exercised in part only, an executed
new agreement with the same terms as this Agreement evidencing the right to
purchase the balance of the shares of Issuer Common Stock purchasable hereunder,
and (ii) Holder shall deliver to Issuer a letter agreeing that Holder shall not
offer to sell or otherwise dispose of such Option Shares in violation of
applicable federal and state law or of the provisions of this Agreement.

               (c) In addition to any other legend that is required by
applicable law, certificates for the Option Shares delivered at each Closing
shall be endorsed with a restrictive legend which shall read substantially as
follows:

     THE TRANSFER OF THE STOCK REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO
     RESTRICTIONS ARISING UNDER THE SECURITIES ACT OF


                                      A-5
<PAGE>
 
     1933, AS AMENDED, AND PURSUANT TO THE TERMS OF A STOCK OPTION AGREEMENT
     DATED AS OF OCTOBER 10, 1995.  A COPY OF SUCH AGREEMENT WILL BE PROVIDED TO
     THE HOLDER HEREOF WITHOUT CHARGE UPON RECEIPT BY THE ISSUER OF A WRITTEN
     REQUEST THEREFOR.

It is understood and agreed that (i) the portion of the above legend relating to
the Securities Act shall be removed by delivery of substitute certificates
without such legend if Holder shall have delivered to Issuer a copy of a letter
from the staff of the SEC, or an opinion of counsel in form and substance
reasonably satisfactory to Issuer and its counsel, to the effect that such
legend is not required for purposes of the Securities Act and (ii) the reference
to restrictions pursuant to this Agreement in the above legend shall be removed
by delivery of substitute certificate(s) without such reference if the Option
Shares evidenced by certificate(s) containing such reference have been sold or
transferred in compliance with the provisions of this Agreement under
circumstances that do not require the retention of such reference.

               (d) Upon the giving by Holder to Issuer of the written notice of
exercise of the Option provided for under Section 3(e), the tender of the
applicable Purchase Price in immediately available funds and the tender of this
Agreement to Issuer, Holder shall be deemed to be the holder of record of the
shares of Issuer Common Stock issuable upon such exercise, notwithstanding that
the stock transfer books of Issuer shall then be closed or that certificates
representing such shares of Issuer Common Stock shall not then be actually
delivered to Holder.  Issuer shall pay all expenses, and any and all United
States federal, state, and local taxes and other charges that may be payable in
connection with the preparation, issuance and delivery of stock certificates
under this Section 4(d) in the name of Holder or its assignee, transferee, or
designee.

               (e) Issuer agrees (i) that it shall at all times maintain, free
from preemptive rights, sufficient authorized but unissued or treasury shares of
Issuer Common Stock so that the Option may be exercised without additional
authorization of Issuer Common Stock after giving effect to all other options,
warrants, convertible securities and other rights to purchase Issuer Common
Stock, (ii) that it will not, by charter amendment or through reorganization,
consolidation, merger, dissolution or sale of assets, or by any other voluntary
act, avoid or seek to avoid the observance or performance of any of the
covenants, stipulations or conditions to be observed or performed hereunder by
Issuer, (iii) promptly to take all action as may from time to time be required
(including (A) complying with all premerger notification, reporting and waiting
period requirements and (B) in the event prior approval of or notice to any
Regulatory Authority is necessary before the Option may be exercised,
cooperating fully with Holder in preparing such applications or notices and
providing such information to such Regulatory


                                      A-6
<PAGE>
 
Authority as it may require) in order to permit Holder to exercise the Option
and Issuer duly and effectively to issue shares of the Issuer Common Stock
pursuant hereto, and (iv) promptly to take all action provided herein to protect
the rights of Holder against dilution.

          5.   Representations and Warranties of Issuer.  Issuer hereby
               ----------------------------------------                
represents and warrants to Grantee (and Holder, if different than Grantee) as
follows:

               (a) Corporate Authority.  Issuer has full corporate power and
                   -------------------                                      
authority to execute and deliver this Agreement and to consummate the
transactions contemplated hereby; the execution and delivery of this Agreement
and, subject to receiving any necessary Regulatory Approvals, the consummation
of the transactions contemplated hereby have been duly and validly authorized by
the Board of Directors of Issuer, and no other corporate proceedings on the part
of Issuer are necessary to authorize this Agreement or to consummate the
transactions so contemplated; this Agreement has been duly and validly executed
and delivered by Issuer.

               (b) Beneficial Ownership. To the best knowledge of Issuer, as of
                   --------------------
the date of this Agreement, no person or group has beneficial ownership of more
than 10% of the issued and outstanding shares of Issuer Common Stock.

               (c) Shares Reserved for Issuance; Capital Stock.  Issuer has 
                   -------------------------------------------
taken all necessary corporate action to authorize and reserve and permit it to
issue, and at all times from the date hereof through the termination of this
Agreement in accordance with its terms, will have reserved for issuance upon the
exercise of the Option, that number of shares of Issuer Common Stock equal to
the maximum number of shares of Issuer Common Stock at any time and from time to
time purchasable upon exercise of the Option, and all such shares, upon issuance
pursuant to the Option, will be duly authorized, validly issued, fully paid and
nonassessable, and will be delivered free and clear of all Liens, (other than
those created by this Agreement) and not subject to any preemptive rights.

               (d) No Violations.  The execution, delivery and performance of 
                   -------------
this Agreement does not and will not, and the consummation by Issuer of any of
the transactions contemplated hereby will not, constitute or result in (A) a
breach or violation of, or a default under, its articles of incorporation or by-
laws, or the comparable governing instruments of any of its subsidiaries, or (B)
a breach or violation of, or a default under, any agreement, lease, contract,
note, mortgage, indenture, arrangement or other obligation of it or any of its
subsidiaries (with or without the giving of notice, the lapse of time or both)
or under any law, rule, ordinance or regulation or judgment, decree, order,
award or governmental or non-governmental permit or license to which it or any
of its


                                      A-7
<PAGE>
 
subsidiaries is subject, that would, in any case give any other person the
ability to prevent or enjoin Issuer's performance under this Agreement in any
material respect.

               (e) Board Action.  The Board of Directors of Issuer having 
                   ------------
approved this Agreement and the consummation of the transactions contemplated
hereby by the vote of greater than 66 2/3% of the members of the Meridian
Board of Directors, the provisions of Chapter 25 of the BCL, and the provisions
of Articles Eleventh and Sixteenth of its Articles of Incorporation, do not and
will not apply to this Agreement or the purchase of shares of Issuer Common
Stock pursuant to this Agreement.

               (f) Rights Amendment.  The Meridian Rights Agreement has been 
                   ----------------
amended to provide that Grantee will not become an "Acquiring Person" or an
"Adverse Person" and that no "Triggering Event," "Stock Acquisition Date" or
"Distribution Date" (as such terms are defined in the Meridian Rights Agreement)
will occur as a result of the approval, execution or delivery of this Agreement
or the Plan or the consummation of the transactions contemplated hereby and
thereby, including the acquisition of shares of Issuer Common Stock by Grantee
or Holder pursuant to this Agreement.

          6.   Representations and Warranties of Grantee.  Grantee hereby
               -----------------------------------------                 
represents and warrants to Issuer as follows:

               (a) Corporate Authority.  Grantee has full corporate power and
                   -------------------                                       
authority to enter into this Agreement and, subject to obtaining the approvals
referred to in this Agreement, to consummate the transactions contemplated by
this Agreement; the execution and delivery of this Agreement and the
consummation of the transactions contemplated hereby have been duly authorized
by all necessary corporate action on the part of Grantee; and this Agreement has
been duly executed and delivered by Grantee.

               (b) Purchase Not for Distribution.  Any Option Shares or other
                   -----------------------------                             
securities acquired by Grantee or Holder upon exercise of the Option will not be
taken with a view to the public distribution thereof and will not be transferred
or otherwise disposed of except in a transaction registered or exempt from
registration under the Securities Act.

          7.   Adjustment upon Changes in Issuer Capitalization, Etc.
               ------------------------------------------------------

               (a) In the event of any change in Issuer Common Stock by reason
of a stock dividend, stock split, split-up, recapitalization, combination,
exchange of shares, exercise of the Meridian Rights or similar transaction, the
type and number of shares or securities subject to the Option, and the Purchase
Price therefor, shall be adjusted appropriately, and proper provision shall be
made in the agreements governing such transaction so that Holder shall receive,
upon exercise of the


                                      A-8
<PAGE>
 
Option, the number and class of shares or other securities or property that
Holder would have received in respect of Issuer Common Stock if the Option had
been exercised immediately prior to such event, or the record date therefor, as
applicable.  If any additional shares of Issuer Common Stock are issued after
the date of this Agreement (other than pursuant to an event described in the
first sentence of this Section 7(a)), upon exercise of any option to purchase
Issuer Common Stock outstanding on the date hereof, the number of shares of
Issuer Common Stock subject to the Option shall be adjusted so that, after such
issuance, it, together with any shares of Issuer Common Stock previously issued
pursuant hereto, equals 19.9% of the number of shares of Issuer Common Stock
then issued and outstanding, without giving effect to any shares subject to or
issued pursuant to the Option.    No provision of this Section 7 shall be deemed
to affect or change, or constitute authorization for any violation of, any of
the covenants or representations in the Plan.

               (b) In the event that Issuer shall enter into an agreement (i) to
consolidate with or merge into any person, other than Grantee or one of its
subsidiaries, and shall not be the continuing or surviving corporation of such
consolidation or merger, (ii) to permit any person, other than Grantee or one of
its subsidiaries, to merge into Issuer and Issuer shall be the continuing or
surviving corporation, but, in connection with such merger, the then outstanding
shares of Issuer Common Stock shall be changed into or exchanged for stock or
other securities of Issuer or any other person or cash or any other property or
the outstanding shares of Issuer Common Stock immediately prior to such merger
shall after such merger represent less than 50% of the outstanding shares and
share equivalents of the merged company, or (iii) to sell or otherwise transfer
all or substantially all of its assets or deposits to any person, other than
Grantee or one of its subsidiaries, then, and in each such case, the agreement
governing such transaction shall make proper provisions so that the Option
shall, upon the consummation of any such transaction and upon the terms and
conditions set forth herein, be converted into, or exchanged for, an option (the
"Substitute Option"), at the election of Holder, of either (x) the Acquiring
Corporation (as hereinafter defined), (y) any person that controls the Acquiring
Corporation, or (z) in the case of a merger described in clause (ii), Issuer
(such person being referred to as "Substitute Option Issuer").

               (c) The Substitute Option shall have the same terms as the
Option, provided, that, if the terms of the Substitute Option cannot, for legal
reasons, be the same as the Option, such terms shall be as similar as possible
and in no event less advantageous to Holder. Substitute Option Issuer shall also
enter into an agreement with Holder in substantially the same form as this
Agreement, which shall be applicable to the Substitute Option.


                                      A-9
<PAGE>
 
               (d) The Substitute Option shall be exercisable for such number of
shares of Substitute Common Stock (as hereinafter defined) as is equal to the
Assigned Value (as hereinafter defined) multiplied by the number of shares of
Issuer Common Stock for which the Option was theretofore exercisable, divided by
the Average Price (as hereinafter defined).  The exercise price of Substitute
Option per share of Substitute Common Stock (the "Substitute Option Price")
shall then be equal to the Purchase Price multiplied by a fraction in which the
numerator is the number of shares of Issuer Common Stock for which the Option
was theretofore exercisable and the denominator is the number of shares of the
Substitute Common Stock for which the Substitute Option is exercisable.

               (e) The following terms have the meanings indicated:

                   (i)    "Acquiring Corporation" shall mean (x) the continuing
     or surviving corporation of a consolidation or merger with Issuer (if other
     than Issuer), (y) Issuer in a merger in which Issuer is the continuing or
     surviving person, or (z) the transferee of all or substantially all of
     Issuer's assets (or a substantial part of the assets of its subsidiaries
     taken as a whole).

                   (ii)   "Substitute Common Stock" shall mean the shares of
     capital stock (or similar equity interest) with the greatest voting power
     in respect of the election of directors (or persons similarly responsible
     for the direction of the business and affairs) of the Substitute Option
     Issuer.

                   (iii)  "Assigned Value" shall mean the highest of (w) the
     price per share of Issuer Common Stock at which a Tender Offer or an
     Exchange Offer therefor has been made, (x) the price per share of Issuer
     Common Stock to be paid by any third party pursuant to an agreement with
     Issuer, (y) the highest closing price for shares of Issuer Common Stock
     within the six-month period immediately preceding the consolidation,
     merger, or sale in question and (z) in the event of a sale of all or
     substantially all of Issuer's assets or deposits an amount equal to (I) the
     sum of the price paid in such sale for such assets (and/or deposits) and
     the current market value of the remaining assets of Issuer, as determined
     by a nationally recognized investment banking firm selected by Holder
     divided by (II) the number of shares of Issuer Common Stock outstanding at
     such time. In the event that a Tender Offer or an Exchange Offer is made
     for Issuer Common Stock or an agreement is entered into for a merger or
     consolidation involving consideration other than cash, the value of the
     securities or other property issuable or deliverable in exchange for Issuer
     Common Stock shall be determined by a


                                     A-10
<PAGE>
 
     nationally recognized investment banking firm selected by Holder.

                   (iv)  "Average Price" shall mean the average closing price of
     a share of Substitute Common Stock for the one year immediately preceding
     the consolidation, merger, or sale in question, but in no event higher than
     the closing price of the shares of Substitute Common Stock on the day
     preceding such consolidation, merger or sale; provided that if Issuer is
     the issuer of the Substitute Option, the Average Price shall be computed
     with respect to a share of common stock issued by Issuer, the person
     merging into Issuer or by any company which controls such person, as Holder
     may elect.

               (f) In no event, pursuant to any of the foregoing paragraphs,
shall the Substitute Option be exercisable for more than 19.9% of the aggregate
of the shares of Substitute Common Stock outstanding prior to exercise of the
Substitute Option. In the event that the Substitute Option would be exercisable
for more than 19.9% of the aggregate of the shares of Substitute Common Stock
but for the limitation in the first sentence of this Section 7(f), Substitute
Option Issuer shall make a cash payment to Holder equal to the excess of (i) the
value of the Substitute Option without giving effect to the limitation in the
first sentence of this Section 7(f) over (ii) the value of the Substitute Option
after giving effect to the limitation in the first sentence of this Section
7(f). This difference in value shall be determined by a nationally-recognized
investment banking firm selected by Holder.

               (g) Issuer shall not enter into any transaction described in
Section 7(b) unless the Acquiring Corporation and any person that controls the
Acquiring Corporation assume in writing all the obligations of Issuer hereunder
and take all other actions that may be necessary so that the provisions of this
Section 7 are given full force and effect (including, without limitation, any
action that may be necessary so that the holders of the other shares of common
stock issued by Substitute Option Issuer are not entitled to exercise any rights
by reason of the issuance or exercise of the Substitute Option and the shares of
Substitute Common Stock are otherwise in no way distinguishable from or have
lesser economic value (other than any diminution in value resulting from the
fact that the Substitute Common Stock are restricted securities, as defined in
Rule 144 under the Securities Act or any successor provision) than other shares
of common stock issued by Substitute Option Issuer).

          8.   Repurchase at the Option of Holder.
               ---------------------------------- 

               (a) At the request of Holder at any time (i) commencing upon the
first occurrence of a Repurchase Event (as defined in Section 8(d)) and ending
18 months immediately


                                     A-11
<PAGE>
 
thereafter and (ii) for 30 business days following the occurrence of either of
the events set forth in clauses (i) and (ii) of Section 3(f) (but solely as to
shares of Issuer Common Stock with respect to which the required approval was
not received, Issuer (or any successor) shall repurchase from Holder (x) the
Option and (y) all shares of Issuer Common Stock purchased by Holder pursuant
hereto with respect to which Holder then has beneficial ownership.  The date on
which Holder exercises its rights under this Section 8 is referred to as the
"Request Date".  Such repurchase shall be at an aggregate price (the "Section 8
Repurchase Consideration") equal to the sum of:

                   (i)    the aggregate Purchase Price paid by Holder for any
     shares of Issuer Common Stock acquired pursuant to the Option with respect
     to which Holder then has beneficial ownership;

                   (ii)   the excess, if any, of (x) the Applicable Price (as
     defined below) for each share of Issuer Common Stock over (y) the Purchase
     Price (subject to adjustment pursuant to Section 7), multiplied by the
     number of shares of Issuer Common Stock with respect to which the Option
     has not been exercised; and

                   (iii)  the excess, if any, of the Applicable Price over the
     Purchase Price (subject to adjustment pursuant to Section 7) paid (or, in
     the case of Option Shares with respect to which the Option has been
     exercised but the Closing Date has not occurred, payable) by Holder for
     each share of Issuer Common Stock with respect to which the Option has been
     exercised and with respect to which Holder then has beneficial ownership,
     multiplied by the number of such shares.

               (b) If Holder exercises its rights under this Section 8, Issuer
shall, within 10 business days after the Request Date, pay the Section 8
Repurchase Consideration to Holder in immediately available funds, and
contemporaneously with such payment, Holder shall surrender to Issuer the Option
and the certificates evidencing the shares of Issuer Common Stock purchased
thereunder with respect to which Holder then has beneficial ownership, and
Holder shall warrant that it has sole record and beneficial ownership of such
shares and that the same are then free and clear of all Liens. Notwithstanding
the foregoing, to the extent that prior notification to or approval of any
Regulatory Authority is required in connection with the payment of all or any
portion of the Section 8 Repurchase Consideration, Holder shall have the ongoing
option to revoke its request for repurchase pursuant to Section 8, in whole or
in part, or to require that Issuer deliver from time to time that portion of the
Section 8 Repurchase Consideration that it is not then so prohibited from paying
and promptly file the required notice or application for approval and
expeditiously process the same (and each party shall cooperate with the other in
the filing


                                     A-12
<PAGE>
 
of any such notice or application and the obtaining of any such approval) and
the period of time that would otherwise run pursuant to the preceding sentence
for the payment of the portion of the Section 8 Repurchase Consideration shall
run instead from the date on which, as the case may be, (i) any required
notification period has expired or been terminated or (ii) such approval has
been obtained and, in either event, any requisite waiting period shall have
passed.  If any Regulatory Authority disapproves of any part of Issuer's
proposed repurchase pursuant to this Section 8, Issuer shall promptly give
notice of such fact to Holder.  If any Regulatory Authority prohibits the
repurchase in part but not in whole, then Holder shall have the right (i) to
revoke the repurchase request or (ii) to the extent permitted by such Regulatory
Authority, determine whether the repurchase should apply to the Option and/or
Option Shares and to what extent to each, and Holder shall thereupon have the
right to exercise the Option as to the number of Option Shares for which the
Option was exercisable at the Request Date less the sum of the number of shares
covered by the Option in respect of which payment has been made pursuant to
Section 8(a)(ii) and the number of shares covered by the portion of the Option
(if any) that has been repurchased; provided that if the Option shall have
terminated prior to the date of such notice or shall be scheduled to terminate
at any time before the expiration of a period ending on the thirtieth business
day after such date, Grantee shall nonetheless have the right so to exercise the
Option or exercise its rights under Section 9 until the expiration of such
period of 30 business days.  Holder shall notify Issuer of its determination
under the preceding sentence within five (5) business days of receipt of notice
of disapproval of the repurchase.

               (c) For purposes of this Agreement, the "Applicable Price" means
the highest of (i) the highest price per share of Issuer Common Stock paid for
any such share by the person or groups described in Section 8(d)(i), (ii) the
price per share of Issuer Common Stock received by holders of Issuer Common
Stock in connection with any merger or other business combination transaction
described in Section 7(b)(i), 7(b)(ii) or 7(b)(iii), or (iii) the highest
closing sales price per share of Issuer Common Stock quoted on the Nasdaq NMS
during the 40 business days preceding the Request Date; provided, however, that
in the event of a sale of less than all of Issuer's assets, the Applicable Price
shall be the sum of the price paid in such sale for such assets and the current
market value of the remaining assets of Issuer as determined by a nationally
recognized investment banking firm selected by Holder, divided by the number of
shares of the Issuer Common Stock outstanding at the time of such sale. If the
consideration to be offered, paid or received pursuant to either of the
foregoing clauses (i) or (ii) shall be other than in cash, the value of such
consideration shall be determined in good faith by an independent nationally
recognized investment banking firm selected by Holder and reasonably acceptable
to


                                     A-13
<PAGE>
 
Issuer, which determination shall be conclusive for all purposes of this
Agreement.

               (d) As used herein, "Repurchase Event" shall occur if (i) any
person (other than Grantee or any subsidiary of Grantee) shall have acquired
beneficial ownership of (as such term is defined in Rule 13d-3 promulgated under
the Exchange Act), or the right to acquire beneficial ownership of, or any
"group" (as such term is defined under the Exchange Act) shall have been formed
which beneficially owns or has the right to acquire beneficial ownership of, 25%
or more of the then outstanding shares of Issuer Common Stock, or (ii) Issuer
has entered into an agreement pursuant to which any of the transactions
described in Section 7(b)(i), 7(b)(ii) or 7(b)(iii) could or will be
consummated.

          9.   Registration Rights.
               ------------------- 

               (a) Demand Registration Rights.  Issuer shall, subject to the
                   --------------------------                               
conditions of Section 9(c) below, if requested by any Holder, including Grantee
and any permitted transferee ("Selling Shareholder"), as expeditiously as
possible prepare and file a registration statement under the Securities Act if
such registration is necessary in order to permit the sale or other disposition
of any or all shares of Issuer Common Stock or other securities that have been
acquired by or are issuable to the Selling Shareholder upon exercise of the
Option in accordance with the intended method of sale or other disposition
stated by the Selling Shareholder in such request, including without limitation
a "shelf" registration statement under Rule 415 under the Securities Act or any
successor provision, and Issuer shall use its best efforts to qualify such
shares or other securities for sale under any applicable state securities laws.

               (b) Additional Registration Rights.  If Issuer at any time after
                   ------------------------------
the exercise of the Option proposes to register any shares of Issuer Common
Stock under the Securities Act in connection with an underwritten public
offering of such Issuer Common Stock, Issuer will promptly give written notice
to the Selling Shareholders of its intention to do so and, upon the written
request of any Selling Shareholder given within 30 days after receipt of any
such notice (which request shall specify the number of shares of Issuer Common
Stock intended to be included in such underwritten public offering by the
Selling Shareholder), Issuer will cause all such shares for which a Selling
Shareholder requests participation in such registration, to be so registered and
included in such underwritten public offering; provided, however, that Issuer
may elect to not cause any such shares to be so registered (i) if the
underwriters in good faith object for valid business reasons, or (ii) in the
case of a registration solely to implement an employee benefit plan or a
registration filed on Form S-4 of the Securities Act or any successor Form;
provided, further, however, that such election pursuant to (i) may only be made
two times. If some but not all the shares


                                     A-14
<PAGE>
 
of Issuer Common Stock with respect to which Issuer shall have received requests
for registration pursuant to this Section 9(b) shall be excluded from such
registration, Issuer shall make appropriate allocation of shares to be
registered among the Selling Shareholders desiring to register their shares pro
rata in the proportion that the number of shares requested to be registered by
each such Selling Shareholder bears to the total number of shares requested to
be registered by all such Selling Shareholders then desiring to have Issuer
Common Stock registered for sale.

               (c) Conditions to Required Registration.  Issuer shall use all
                   -----------------------------------                       
reasonable efforts to cause each registration statement referred to in Section
9(a) above to become effective and to obtain all consents or waivers of other
parties which are required therefor and to keep such registration statement
effective; provided, however, that Issuer may delay any registration of Option
Shares required pursuant to Section 9(a) above for a period not exceeding 90
days provided Issuer shall in good faith determine that any such registration
would adversely affect an offering or contemplated offering of other securities
by Issuer, and Issuer shall not be required to register Option Shares under the
Securities Act pursuant to Section 9(a) above:

                   (i)   prior to the earliest of (a) termination of the Plan
     pursuant to Article VII thereof, (b) failure to obtain the requisite
     shareholder approval pursuant to Section 6.01 of the Plan, and (c) a
     Purchase Event or a Preliminary Purchase Event;

                   (ii)  on more than one occasion during any calendar year;

                   (iii) within 90 days after the effective date of a
     registration referred to in Section 9(b) above pursuant to which the
     Selling Shareholder or Selling Shareholders concerned were afforded the
     opportunity to register such shares under the Securities Act and such
     shares were registered as requested; and

                   (iv)  unless a request therefor is made to Issuer by Selling
     Shareholders that hold at least 25% or more of the aggregate number of
     Option Shares (including shares of Issuer Common Stock issuable upon
     exercise of the Option) then outstanding.

          In addition to the foregoing, Issuer shall not be required to maintain
the effectiveness of any registration statement after the expiration of nine
months from the effective date of such registration statement.  Issuer shall use
all reasonable efforts to make any filings, and take all steps, under all
applicable state securities laws to the extent necessary to permit the sale or
other disposition of the Option Shares so registered in accordance with the
intended method of distribution


                                     A-15
<PAGE>
 
for such shares; provided, however, that Issuer shall not be required to consent
to general jurisdiction or qualify to do business in any state where it is not
otherwise required to so consent to such jurisdiction or to so qualify to do
business.

               (d) Expenses.  Except where applicable state law prohibits such
                   --------                                                   
payments, Issuer will pay all expenses (including without limitation
registration fees, qualification fees, blue sky fees and expenses (including the
fees and expenses of counsel), legal expenses, including the reasonable fees and
expenses of one counsel to the holders whose Option Shares are being registered,
printing expenses and the costs of special audits or "cold comfort" letters,
expenses of underwriters, excluding discounts and commissions but including
liability insurance if Issuer so desires or the underwriters so require, and the
reasonable fees and expenses of any necessary special experts) in connection
with each registration pursuant to Section 9(a) or 9(b) above (including the
related offerings and sales by holders of Option Shares) and all other
qualifications, notifications or exemptions pursuant to Section 9(a) or 9(b)
above.

               (e) Indemnification.  In connection with any registration under
                   ---------------                                            
Section 9(a) or 9(b) above Issuer hereby indemnifies the Selling Shareholders,
and each underwriter thereof, including each person, if any, who controls such
holder or underwriter within the meaning of Section 15 of the Securities Act,
against all expenses, losses, claims, damages and liabilities caused by any
untrue, or alleged untrue, statement of a material fact contained in any
registration statement or prospectus or notification or offering circular
(including any amendments or supplements thereto) or any preliminary prospectus,
or caused by any omission, or alleged omission, to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading, except insofar as such expenses, losses, claims, damages or
liabilities of such indemnified party are caused by any untrue statement or
alleged untrue statement that was included by Issuer in any such registration
statement or prospectus or notification or offering circular (including any
amendments or supplements thereto) in reliance upon and in conformity with,
information furnished in writing to Issuer by such indemnified party expressly
for use therein, and Issuer and each officer, director and controlling person of
Issuer shall be indemnified by such Selling Shareholders, or by such
underwriter, as the case may be, for all such expenses, losses, claims, damages
and liabilities caused by any untrue, or alleged untrue, statement, that was
included by Issuer in any such registration statement or prospectus or
notification or offering circular (including any amendments or supplements
thereto) in reliance upon, and in conformity with, information furnished in
writing to Issuer by such holder or such underwriter, as the case may be,
expressly for such use.


                                     A-16
<PAGE>
 
          Promptly upon receipt by a party indemnified under this Section 9(e)
of notice of the commencement of any action against such indemnified party in
respect of which indemnity or reimbursement may be sought against any
indemnifying party under this Section 9(e), such indemnified party shall notify
the indemnifying party in writing of the commencement of such action, but the
failure so to notify the indemnifying party shall not relieve it of any
liability which it may otherwise have to any indemnified party under this
Section 9(e) unless the failure so to notify the indemnified party results in
substantial prejudice thereto.  In case notice of commencement of any such
action shall be given to the indemnifying party as above provided, the
indemnifying party shall be entitled to participate in and, to the extent it may
wish, jointly with any other indemnifying party similarly notified, to assume
the defense of such action at its own expense, with counsel chosen by it and
satisfactory to such indemnified party.  The indemnified party shall have the
right to employ separate counsel in any such action and participate in the
defense thereof, but the fees and expenses of such counsel (other than
reasonable costs of investigation) shall be paid by the indemnified party unless
(i) the indemnifying party either agrees to pay the same, (ii) the indemnifying
party fails to assume the defense of such action with counsel satisfactory to
the indemnified party, or (iii) the indemnified party has been advised by
counsel that one or more legal defenses may be available to the indemnifying
party that may be contrary to the interest of the indemnified party, in which
case the indemnifying party shall be entitled to assume the defense of such
action notwithstanding its obligation to bear fees and expenses of such counsel.
No indemnifying party shall be liable for any settlement entered into without
its consent, which consent may not be unreasonably withheld.

          If the indemnification provided for in this Section 9(e) is
unavailable to a party otherwise entitled to be indemnified in respect of any
expenses, losses, claims, damages or liabilities referred to herein, then the
indemnifying party, in lieu of indemnifying such party otherwise entitled to be
indemnified, shall contribute to the amount paid or payable by such party to be
indemnified as a result of such expenses, losses, claims, damages or liabilities
in such proportion as is appropriate to reflect the relative benefits received
by Issuer, the Selling Shareholders and the underwriters from the offering of
the securities and also the relative fault of Issuer, the Selling Shareholders
and the underwriters in connection with the statements or omissions which
resulted in such expenses, losses, claims, damages or liabilities, as well as
any other relevant equitable considerations.  The amount paid or payable by a
party as a result of the expenses, losses, claims, damages and liabilities
referred to above shall be deemed to include any legal or other fees or expenses
reasonably incurred by such party in connection with investigating or defending
any action or claim; provided, however, that in no case shall any Selling
Shareholder be responsible, in the aggregate, for any amount in


                                     A-17
<PAGE>
 
excess of the net offering proceeds attributable to its Option Shares included
in the offering.  No person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation.  Any obligation by any holder to indemnify shall be several
and not joint with other holders.

          In connection with any registration pursuant to Section 9(a) or 9(b)
above, Issuer and each Selling Shareholder (other than Grantee) shall enter into
an agreement containing the indemnification provisions of this Section 9(e).

               (f) Miscellaneous Reporting.  Issuer shall comply with all 
                   -----------------------  
reporting requirements and will do all such other things as may be necessary to
permit the expeditious sale at any time of any Option Shares by the Selling
Shareholders thereof in accordance with and to the extent permitted by any rule
or regulation promulgated by the SEC from time to time, including, without
limitation, Rule 144. Issuer shall at its expense provide the Selling
Shareholders with any information necessary in connection with the completion
and filing of any reports or forms required to be filed by them under the
Securities Act or the Exchange Act, or required pursuant to any state securities
laws or the rules of any stock exchange.

               (g) Issue Taxes.  Issuer will pay all stamp taxes in connection
                   -----------
with the issuance and the sale of the Option Shares and in connection with the
exercise of the Option, and will save the Selling Shareholders harmless, without
limitation as to time, against any and all liabilities, with respect to all such
taxes.

          10.  Quotation; Listing.  If Issuer Common Stock or any other
               ------------------                                      
securities to be acquired in connection with the exercise of the Option are then
authorized for quotation or trading or listing on the NYSE, the Nasdaq NMS or
any securities exchange, Issuer, upon the request of Holder, will promptly file
an application, if required, to authorize for quotation or trading or listing
the shares of Issuer Common Stock or other securities to be acquired upon
exercise of the Option on the NYSE, the Nasdaq NMS or such other securities
exchange and will use its best efforts to obtain approval, if required, of such
quotation or listing as soon as practicable.

          11.  Division of Option.  This Agreement (and the Option granted
               ------------------                                         
hereby) are exchangeable, without expense, at the option of Holder, upon
presentation and surrender of this Agreement at the principal office of Issuer
for other Agreements providing for Options of different denominations entitling
the holder thereof to purchase in the aggregate the same number of shares of
Issuer Common Stock purchasable hereunder.  The terms "Agreement" and "Option"
as used herein include any other Agreements and related Options for which this
Agreement (and the Option granted hereby) may be exchanged.  Upon receipt by
Issuer


                                     A-18
<PAGE>
 
of evidence reasonably satisfactory to it of the loss, theft, destruction or
mutilation of this Agreement, and (in the case of loss, theft or destruction) of
reasonably satisfactory indemnification, and upon surrender and cancellation of
this Agreement, if mutilated, Issuer will execute and deliver a new Agreement of
like tenor and date.  Any such new Agreement executed and delivered shall
constitute an additional contractual obligation on the part of Issuer, whether
or not the Agreement so lost, stolen, destroyed or mutilated shall at any time
be enforceable by anyone.

          12.  Miscellaneous.
               ------------- 

               (a) Expenses.  Each of the parties hereto shall bear and pay 
                   --------
all costs and expenses incurred by it or on its behalf in connection with the
transactions contemplated hereunder, including fees and expenses of its own
financial consultants, investment bankers, accountants and counsel.

               (b) Waiver and Amendment.  Any provision of this Agreement may be
                   --------------------
waived at any time by the party that is entitled to the benefits of such
provision.  This Agreement may not be modified, amended, altered or supplemented
except upon the execution and delivery of a written agreement executed by the
parties hereto.

               (c) Entire Agreement: No Third-Party Beneficiaries; Severability.
                   ------------------------------------------------------------
This Agreement, together with the Plan and the other documents and instruments
referred to herein and therein, between Grantee and Issuer (i) constitutes the
entire agreement and supersedes all prior agreements and understandings, both
written and oral, between the parties with respect to the subject matter hereof
and (ii) is not intended to confer upon any person other than the parties hereto
(other than the indemnified parties under Section 9(e) and any transferees of
the Option Shares or any permitted transferee of this Agreement pursuant to
Section 12(h)) any rights or remedies hereunder.  If any term, provision,
covenant or restriction of this Agreement is held by a court of competent
jurisdiction or Regulatory Authority to be invalid, void or unenforceable, the
remainder of the terms, provisions, covenants and restrictions of this Agreement
shall remain in full force and effect and shall in no way be affected impaired
or invalidated.  If for any reason such court or Regulatory Authority determines
that the Option does not permit Holder to acquire, or does not require Issuer to
repurchase, the full number of shares of Issuer Common Stock as provided in
Section 2 (as may be adjusted herein), it is the express intention of Issuer to
allow Holder to acquire or to require Issuer to repurchase such lesser number of
shares as may be permissible without any amendment or modification hereof.

               (d) Governing Law.  This Agreement shall be governed and 
                   -------------                 
construed in accordance with the laws of the


                                     A-19
<PAGE>
 
Commonwealth of Pennsylvania without regard to any applicable conflicts of law
rules.

               (e) Descriptive Headings.  The descriptive headings contained 
                   --------------------     
herein are for convenience of reference only and shall not affect in any way the
meaning or interpretation of this Agreement.

               (f) Notices.  All notices and other communications hereunder 
                   -------
shall be in writing and shall be deemed given if delivered personally,
telecopied (with confirmation) or mailed by registered or certified mail (return
receipt requested) to the parties at the addresses set forth in the Plan (or at
such other address for a party as shall be specified by like notice).

               (g) Counterparts.  This Agreement and any amendments hereto may
                   ------------
be executed in two counterparts, each of which shall be considered one and the
same agreement and shall become effective when both counterparts have been
signed, it being understood that both parties need not sign the same
counterpart.

               (h) Assignment.  Neither this Agreement nor any of the rights,
                   ----------   
interests or obligations hereunder or under the Option shall be assigned by any
of the parties hereto (whether by operation of law or otherwise) without the
prior written consent of the other party, except that Holder may assign this
Agreement to a wholly-owned subsidiary of Holder and Holder may assign its
rights hereunder in whole or in part after the occurrence of a Purchase Event.
Subject to the preceding sentence, this Agreement shall be binding upon, inure
to the benefit of and be enforceable by the parties and their respective
successors and assigns.

               (i) Further Assurances.  In the event of any exercise of the 
                   ------------------
Option by the Holder, Issuer and the Holder shall execute and deliver all other
documents and instruments and take all other action that may be reasonably
necessary in order to consummate the transactions provided for by such exercise.

               (j) Specific Performance.  The parties hereto agree that this
                   --------------------                                     
Agreement may be enforced by either party through specific performance,
injunctive relief and other equitable relief.  Both parties further agree to
waive any requirement for the securing or posting of any bond in connection with
the obtaining of any such equitable relief and that this provision is without
prejudice to any other rights that the parties hereto may have for any failure
to perform this Agreement.


                                     A-20
<PAGE>
 
          IN WITNESS WHEREOF, Issuer and Grantee have caused this Stock Option
Agreement to be signed by their respective officers thereunto duly authorized,
all as of the day and year first written above.

                                       MERIDIAN BANCORP, INC.            
                                                                         
                                       By /s/ Samuel A. McCullough
                                         ---------------------------------
                                             Samuel A. McCullough,       
                                             Chairman, President and Chief
                                             Executive Officer           
                                                                         
                                                                         
                                       CORESTATES FINANCIAL CORP         
                                                                         
                                       By /s/ Terrence A. Larsen
                                         ---------------------------------
                                             Terrence A. Larsen,         
                                             Chairman and Chief Executive 
                                             Officer                      

<PAGE>
 
                                                                   Exhibit 10(b)

                       CORESTATES STOCK OPTION AGREEMENT
                       ---------------------------------


          STOCK OPTION AGREEMENT, dated as of October 10, 1995 (the
"Agreement"), by and between CORESTATES FINANCIAL CORP, a Pennsylvania
corporation ("Issuer"), and MERIDIAN BANCORP, INC., a Pennsylvania corporation
("Grantee").

                                    RECITALS

          A.   The Plan.  Grantee and Issuer are concurrently herewith entering
               --------                                                        
an Agreement and Plan of Merger, dated as of the date hereof (the "Plan"),
providing for, among other things, the merger of Grantee with and into Issuer,
with Issuer being the surviving corporation.

          B.   Condition to Plan.  As a condition and inducement to Grantee's
               -----------------                                             
execution of the Plan and Grantee's agreement referred to in the next sentence,
Grantee has required that Issuer agree, and Issuer has agreed, to grant Grantee
the Option (as hereinafter defined).  As a condition and inducement to Issuer's
execution of the Plan and this Agreement, Grantee and Issuer have concurrently
herewith entered into an agreement (the "Meridian" Stock Option Agreement") to
grant an option to Issuer on terms and conditions substantially identical to
those of the Option and this Agreement.

          NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth herein and in
the Plan and the Meridian Stock Option Agreement, and intending to be legally
bound hereby, Issuer and Grantee agree as follows:

          1.   Defined Terms.  Capitalized terms which are used but not defined
               -------------                                                   
herein shall have the meanings ascribed to such terms in the Plan.

          2.   Grant of Option.  Subject to the terms and conditions set forth
               ---------------                                                
herein, Issuer hereby grants to Grantee an irrevocable option (the "Option") to
purchase a number of shares of common stock, par value $1.00 per share ("Issuer
Common Stock"), of Issuer up to 27,643,009 of such shares (as adjusted as set
forth herein, the "Option Shares," which shall include the Option Shares before
and after any transfer of such Option Shares, but in no event shall the number
of Option Shares for which this Option is exercisable exceed 19.9% of the issued
and outstanding shares of Issuer Common Stock) at a purchase price per Option
Share (as adjusted as set forth herein, the "Purchase Price") equal to $38.50.


                                      B-1
<PAGE>
 
          3.   Exercise of Option.
               ------------------ 

               (a) Provided that (i) Grantee or Holder (as hereinafter defined),
as applicable, shall not be in material breach of the agreements or covenants
contained in this Agreement or, in the case of Grantee, the Plan or the Meridian
Stock Option Agreement, and (ii) no preliminary or permanent injunction or other
order against the delivery of shares covered by the Option issued by any court
of competent jurisdiction in the United States shall be in effect, the Holder
may exercise the Option, in whole or in part, at any time and from time to time
following the occurrence of a Purchase Event (as hereinafter defined); provided
that the Option shall terminate and be of no further force or effect upon the
earliest to occur of (A) the Effective Time, (B) termination of the Plan in
accordance with the terms thereof prior to the occurrence of a Purchase Event or
a Preliminary Purchase Event (as hereinafter defined) or (C) 18 months after
termination of the Plan following the occurrence of a Purchase Event or a
Preliminary Purchase Event; provided, however, that any purchase of shares upon
exercise of the Option shall be subject to compliance with applicable law.
Notwithstanding the termination of the Option, Grantee or Holder as the case may
be, shall be entitled to purchase those Option Shares with respect to which it
has exercised the Option in accordance herewith prior to the termination of the
Option. The term "Holder" shall mean the holder or holders of the Option from
time to time, and which initially is Grantee. The termination of the Option
shall not affect any rights hereunder which by their terms extend beyond the
date of such termination.

               (b) As used herein, a "Purchase Event" means any of the following
events:

                   (i)  Without Grantee's prior written consent, Issuer shall
     have recommended, publicly proposed or publicly announced an intention to
     authorize, recommend or propose, or entered into an agreement with any
     person (other than Grantee or any subsidiary of Grantee) to effect (A) a
     merger, consolidation or similar transaction involving Issuer or any of its
     significant subsidiaries (other than transactions solely between Issuer's
     subsidiaries that are not violative of the Plan), (B) the disposition, by
     sale, lease, exchange or otherwise, of assets or deposits of Issuer or any
     of its significant subsidiaries representing in either case 15% or more of
     the consolidated assets or deposits of Issuer and its subsidiaries or (C)
     the issuance, sale or other disposition by Issuer of (including by way of
     merger, consolidation, share exchange or any similar transaction)
     securities representing 15% or more of the voting power of Issuer or any of
     its significant subsidiaries, other than, in each case of (A), (B), or (C),
     any merger, consolidation, share exchange or similar transaction involving
     Issuer or any of its significant subsidiaries in which the voting
     securities of Issuer


                                      B-2
<PAGE>
 
     outstanding immediately prior thereto continue to represent (by either
     remaining outstanding or being converted into the voting securities of the
     surviving entity of any such transaction) at least 65% of the combined
     voting power of the voting securities of the Issuer or the surviving entity
     outstanding immediately after the consummation of such merger,
     consolidation, or similar transaction (provided any such transaction is not
     violative of the Plan) (each of (A), (B), or (C), an "Acquisition
     Transaction"); or

                   (ii)  any person (other than Grantee or any subsidiary of
     Grantee) shall have acquired beneficial ownership (as such term is defined
     in Rule 13d-3 promulgated under the Exchange Act) of or the right to
     acquire beneficial ownership of, or any "group" (as such term is defined in
     Section 13(d)(3) of the Exchange Act), other than a group of which Grantee
     or any subsidiary of Grantee is a member, shall have been formed which
     beneficially owns or has the right to acquire beneficial ownership of 15%
     or more of the voting power of Issuer or any of its significant
     subsidiaries; or

                   (iii)  any person (other than Grantee or any subsidiary of
     Grantee) shall have commenced (as such term is defined in Rule 14d-2 under
     the Exchange Act) or shall have filed a registration statement under the
     Securities Act, with respect to, a tender offer or exchange offer to
     purchase any shares of Issuer Common Stock such that, upon consummation of
     such offer, such person would own or control 15% or more of the then
     outstanding shares of Issuer Common Stock (such an offer being referred to
     herein as a "Tender Offer" or an "Exchange Offer," respectively); or

                   (iv)  the shareholders shall not have approved the matters
     relating to the Plan requiring approval by the requisite vote at the
     CoreStates Meeting, the CoreStates Meeting shall not have been held or
     shall have been canceled prior to termination of the Plan, or Issuer's
     Board of Directors shall have withdrawn or modified in a manner adverse to
     Grantee the recommendation of Issuer's Board of Directors with respect to
     the matters relating to the Plan requiring approval, in each case after it
     shall have been publicly announced that any person (other than Grantee or
     any subsidiary of Grantee) shall have (A) made, or disclosed an intention
     to make, a bona fide proposal to engage in an Acquisition Transaction, (B)
     commenced a Tender Offer or filed a registration statement under the
     Securities Act with respect to an Exchange Offer or (C) filed an
     application (or given a notice), whether in draft or final form, under the
     Home Owners' Loan Act, as amended ("HOLA"), the BHC Act, the Bank Merger
     Act, as amended (the "BMA") or the Change in Bank Control Act of 1978, as
     amended (the "CBCA"), for approval to engage in an Acquisition Transaction.


                                      B-3
<PAGE>
 
               (c) As used herein, a "Preliminary Purchase Event" means any of
the following events:

                   (i)  any person (other than Grantee or any subsidiary of
     Grantee) shall have made a bona fide proposal to Issuer or its shareholders
     by public announcement, or written communication that is or becomes the
     subject of public disclosure, to engage in an Acquisition Transaction; or

                   (ii)  after a proposal is made by a third party to Issuer or
     its shareholders to engage in an Acquisition Transaction, or such third
     party states its intention to the Issuer to make such a proposal if the
     Plan terminates, Issuer shall have breached any representation, warranty,
     covenant or agreement contained in the Plan; or

                   (iii)  any person (other than Grantee or any subsidiary of
     Grantee) other than in connection with a transaction to which Grantee has
     given its prior written consent, shall have filed an application or notice
     with any Regulatory Authority for approval to engage in an Acquisition
     Transaction; or

                   (iv)  any event entitling Grantee to terminate the Plan
     pursuant to Section 7.01(E) thereof.

As used in this Agreement, "person" shall have the meaning specified in Sections
3(a)(9) and 13(d)(3) of the Exchange Act.

               (d) Issuer shall notify Grantee promptly in writing of the
occurrence of any Preliminary Purchase Event or Purchase Event, it being
understood that the giving of such notice by Issuer shall not be a condition to
the right of Holder to exercise the Option.

               (e) In the event Holder wishes to exercise the Option, it shall
send to Issuer a written notice (the date of which being herein referred to as
the "Notice Date") specifying (i) the total number of Option Shares it intends
to purchase pursuant to such exercise and (ii) a place and date not earlier than
three business days nor later than 15 business days from the Notice Date for the
closing (the "Closing") of such purchase (the "Closing Date"); provided that if
the Closing cannot be consummated by reason of any applicable judgment, decree,
order, law or regulation, the period of time that otherwise would run pursuant
to this sentence shall run instead from the date on which such restriction on
consummation has expired or been terminated; and provided, further, without
limiting the foregoing, that if prior notification to or approval of any
Regulatory Authority is required in connection with such purchase, Issuer shall
cooperate with the Holder in the filing of the required notice of application
for approval and the obtaining of such approval and the Closing shall occur
immediately


                                      B-4
<PAGE>
 
following such regulatory approvals (and any mandatory waiting periods).  Any
exercise of the Option shall be deemed to occur on the Notice Date relating
thereto.

               (f) Notwithstanding Section 3(e), in no event shall any Closing
Date be more than 18 months after the related Notice Date, and if the Closing
Date shall not have occurred within 18 months after the related Notice Date due
to the failure to obtain any such required approval, the exercise of the Option
effected on the Notice Date shall be deemed to have expired. In the event (i)
Holder receives official notice that an approval of any other Regulatory
Authority required for the purchase of Option Shares will not be issued or
granted or (ii) a Closing Date shall not have occurred within 18 months after
the related Notice Date due to the failure to obtain any such required approval,
Grantee shall be entitled to exercise its right as set forth in Section 8 to
exercise the Option in connection with the resale of Issuer Common Stock or
other securities pursuant to a registration statement as provided in Section 9.
The provisions of this Section 3 and Section 4 shall apply with appropriate
adjustments to any such exercise.

          4.   Payment and Delivery of Certificates.
               ------------------------------------ 

               (a) On each Closing Date, Holder shall (i) pay to Issuer, in
immediately available funds by wire transfer to a bank account designated by
Issuer, an amount equal to the Purchase Price multiplied by the number of Option
Shares to be purchased on such Closing Date, and (ii) present and surrender this
Agreement to the Issuer at the address of the Issuer specified in Section 12(f).

               (b) At each Closing, simultaneously with the delivery of
immediately available funds and surrender of this Agreement as provided in
Section 4(a), (i) Issuer shall deliver to Holder (A) a certificate or
certificates representing the Option Shares to be purchased at such Closing,
which Option Shares shall be free and clear of all Liens and subject to no
preemptive rights, and (B) if the Option is exercised in part only, an executed
new agreement with the same terms as this Agreement evidencing the right to
purchase the balance of the shares of Issuer Common Stock purchasable hereunder,
and (ii) Holder shall deliver to Issuer a letter agreeing that Holder shall not
offer to sell or otherwise dispose of such Option Shares in violation of
applicable federal and state law or of the provisions of this Agreement.

               (c) In addition to any other legend that is required by
applicable law, certificates for the Option Shares delivered at each Closing
shall be endorsed with a restrictive legend which shall read substantially as
follows:

     THE TRANSFER OF THE STOCK REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO
     RESTRICTIONS ARISING UNDER THE SECURITIES ACT OF


                                      B-5
<PAGE>
 
     1933, AS AMENDED, AND PURSUANT TO THE TERMS OF A STOCK OPTION AGREEMENT
     DATED AS OF OCTOBER 10, 1995.  A COPY OF SUCH AGREEMENT WILL BE PROVIDED TO
     THE HOLDER HEREOF WITHOUT CHARGE UPON RECEIPT BY THE ISSUER OF A WRITTEN
     REQUEST THEREFOR.

It is understood and agreed that (i) the portion of the above legend relating to
the Securities Act shall be removed by delivery of substitute certificate(s)
without such legend if Holder shall have delivered to Issuer a copy of a letter
from the staff of the SEC, or an opinion of counsel in form and substance
reasonably satisfactory to Issuer and its counsel, to the effect that such
legend is not required for purposes of the Securities Act and (ii) the reference
to restrictions pursuant to this Agreement in the above legend shall be removed
by delivery of substitute certificate(s) without such reference if the Option
Shares evidenced by certificate(s) containing such reference have been sold or
transferred in compliance with provisions of this Agreement under circumstances
that do not require the retention of such reference.

               (d) Upon the giving by Holder to Issuer of the written notice of
exercise of the Option provided for under Section 3(e), the tender of the
applicable Purchase Price in immediately available funds and the tender of this
Agreement to Issuer, Holder shall be deemed to be the holder of record of the
shares of Issuer Common Stock issuable upon such exercise, notwithstanding that
the stock transfer books of Issuer shall then be closed or that certificates
representing such shares of Issuer Common Stock shall not then be actually
delivered to Holder.  Issuer shall pay all expenses, and any and all United
States federal, state, and local taxes and other charges that may be payable in
connection with the preparation, issuance and delivery of stock certificates
under this Section 4(d) in the name of Holder or its assignee, transferee, or
designee.

               (e) Issuer agrees (i) that it shall at all times maintain, free
from preemptive rights, sufficient authorized but unissued or treasury shares of
Issuer Common Stock so that the Option may be exercised without additional
authorization of Issuer Common Stock after giving effect to all other options,
warrants, convertible securities and other rights to purchase Issuer Common
Stock, (ii) that it will not, by charter amendment or through reorganization,
consolidation, merger, dissolution or sale of assets, or by any other voluntary
act, avoid or seek to avoid the observance or performance of any of the
covenants, stipulations or conditions to be observed or performed hereunder by
Issuer, (iii) promptly to take all action as may from time to time be required
(including (A) complying with all premerger notification, reporting and waiting
period requirements and (B) in the event prior approval of or notice to any
Regulatory Authority is necessary before the Option may be exercised,
cooperating fully with Holder in preparing such applications or notices and
providing such information to such Regulatory


                                      B-6
<PAGE>
 
Authority as it may require) in order to permit Holder to exercise the Option
and Issuer duly and effectively to issue shares of the Issuer Common Stock
pursuant hereto, and (iv) promptly to take all action provided herein to protect
the rights of Holder against dilution.

          5.   Representations and Warranties of Issuer.  Issuer hereby
               ----------------------------------------                
represents and warrants to Grantee (and Holder, if different than Grantee) as
follows:

               (a) Corporate Authority.  Issuer has full corporate power and
                   -------------------                                      
authority to execute and deliver this Agreement and to consummate the
transactions contemplated hereby; the execution and delivery of this Agreement
and, subject to receiving any necessary Regulatory Approval, the consummation of
the transactions contemplated hereby have been duly and validly authorized by
the Board of Directors of Issuer, and no other corporate proceedings on the part
of Issuer are necessary to authorize this Agreement or to consummate the
transactions so contemplated; this Agreement has been duly and validly executed
and delivered by Issuer.

               (b) Beneficial Ownership.  To the best knowledge of Issuer, as 
                   --------------------
of the date of this Agreement, no person or group has beneficial ownership of
more than 10% of the issued and outstanding shares of Issuer Common Stock.

               (c) Shares Reserved for Issuance; Capital Stock.  Issuer has 
                   ------------------------------------------- 
taken all necessary corporate action to authorize and reserve and permit it to
issue, and at all times from the date hereof through the termination of this
Agreement in accordance with its terms, will have reserved for issuance upon the
exercise of the Option, that number of shares of Issuer Common Stock equal to
the maximum number of shares of Issuer Common Stock at any time and from time to
time purchasable upon exercise of the Option, and all such shares, upon issuance
pursuant to the Option, will be duly authorized, validly issued, fully paid and
nonassessable, and will be delivered free and clear of all Liens (other than
those created by this Agreement) and not subject to any preemptive rights.

               (d) No Violations.  The execution, delivery and performance of 
                   -------------                        
this Agreement does not and will not, and the consummation by Issuer of any of
the transactions contemplated hereby will not, constitute or result in (A) a
breach or violation of, or a default under, its articles of incorporation or by-
laws, or the comparable governing instruments of any of its subsidiaries, or (B)
a breach or violation of, or a default under, any agreement, lease, contract,
note, mortgage, indenture, arrangement or other obligation of it or any of its
subsidiaries (with or without the giving of notice, the lapse of time or both)
or under any law, rule, ordinance or regulation or judgment, decree, order,
award or governmental or non-governmental permit or license to which it or any
of its


                                      B-7
<PAGE>
 
subsidiaries is subject, that would, in any case give any other person the
ability to prevent or enjoin Issuer's performance under this Agreement in any
material respect.

               (e) Board Action.  The Board of Directors of Issuer having 
                   ------------ 
approved this Agreement and the consummation of the transactions contemplated
hereby by the vote of greater than 66 2/3% of the members of the Meridian
Board of Directors, the provisions of Chapter 25 of the BCL do not and will not
apply to this Agreement or the purchase of shares of Issuer Common Stock
pursuant to this Agreement.

          6.   Representations and Warranties of Grantee.  Grantee hereby
               -----------------------------------------                 
represents and warrants to Issuer as follows:

               (a) Corporate Authority.  Grantee has full corporate power and
                   -------------------                                       
authority to enter into this Agreement and, subject to obtaining the approvals
referred to in this Agreement, to consummate the transactions contemplated by
this Agreement; the execution and delivery of this Agreement and the
consummation of the transactions contemplated hereby have been duly authorized
by all necessary corporate action on the part of Grantee; and this Agreement has
been duly executed and delivered by Grantee.

               (b) Purchase Not for Distribution.  Any Option Shares or other
                   -----------------------------                             
securities acquired by Grantee or Holder upon exercise of the Option will not be
taken with a view to the public distribution thereof and will not be transferred
or otherwise disposed of except in a transaction registered or exempt from
registration under the Securities Act.

          7.   Adjustment upon Changes in Issuer Capitalization, etc.
               ------------------------------------------------------

               (a) In the event of any change in Issuer Common Stock by reason
of a stock dividend, stock split, split-up, recapitalization, combination,
exchange of shares, exercise of the CoreStates Rights or similar transaction,
the type and number of shares or securities subject to the Option, and the
Purchase Price therefor, shall be adjusted appropriately, and proper provision
shall be made in the agreements governing such transaction so that Holder shall
receive, upon exercise of the Option, the number and class of shares or other
securities or property that Holder would have received in respect of Issuer
Common Stock if the Option had been exercised immediately prior to such event,
or the record date therefor, as applicable. If any additional shares of Issuer
Common Stock are issued after the date of this Agreement (other than pursuant to
an event described in the first sentence of this Section 7(a)), upon exercise of
any option to purchase Issuer Common Stock outstanding on the date hereof, the
number of shares of Issuer Common Stock subject to the Option shall be adjusted
so that, after such issuance, it, together with any shares of Issuer Common
Stock previously issued pursuant hereto, equals 19.9% of the number of shares of
Issuer


                                      B-8
<PAGE>
 
Common Stock then issued and outstanding, without giving effect to any shares
subject to or issued pursuant to the Option.  No provision of this Section 7
shall be deemed to affect or change, or constitute authorization for any
violation of, any of the covenants or representations in the Plan.

               (b) In the event that Issuer shall enter into an agreement (i) to
consolidate with or merge into any person, other than Grantee or one of its
subsidiaries, and shall not be the continuing or surviving corporation of such
consolidation or merger, (ii) to permit any person, other than Grantee or one of
its subsidiaries, to merge into Issuer and Issuer shall be the continuing or
surviving corporation, but, in connection with such merger, the then outstanding
shares of Issuer Common Stock shall be changed into or exchanged for stock or
other securities of Issuer or any other person or cash or any other property or
the outstanding shares of Issuer Common Stock immediately prior to such merger
shall after such merger represent less than 50% of the outstanding shares and
share equivalents of the merged company, or (iii) to sell or otherwise transfer
all or substantially all of its assets or deposits to any person, other than
Grantee or one of its subsidiaries, then, and in each such case, the agreement
governing such transaction shall make proper provisions so that the Option
shall, upon the consummation of any such transaction and upon the terms and
conditions set forth herein, be converted into, or exchanged for, an option (the
"Substitute Option"), at the election of Holder, of either (x) the Acquiring
Corporation (as hereinafter defined), (y) any person that controls the Acquiring
Corporation, or (z) in the case of a merger described in clause (ii), Issuer
(such person being referred to as "Substitute Option Issuer").

               (c) The Substitute Option shall have the same terms as the
Option, provided, that, if the terms of the Substitute Option cannot, for legal
reasons, be the same as the Option, such terms shall be as similar as possible
and in no event less advantageous to Holder. Substitute Option Issuer shall also
enter into an agreement with Holder in substantially the same form as this
Agreement, which shall be applicable to the Substitute Option.

               (d) The Substitute Option shall be exercisable for such number of
shares of Substitute Common Stock (as hereinafter defined) as is equal to the
Assigned Value (as hereinafter defined) multiplied by the number of shares of
Issuer Common Stock for which the Option was theretofore exercisable, divided by
the Average Price (as hereinafter defined).  The exercise price of Substitute
Option per share of Substitute Common Stock (the "Substitute Option Price")
shall then be equal to the Purchase Price multiplied by a fraction in which the
numerator is the number of shares of Issuer Common Stock for which the Option
was theretofore exercisable and the denominator is the number of shares of the
Substitute Common Stock for which the Substitute Option is exercisable.


                                      B-9
<PAGE>
 
               (e) The following terms have the meanings indicated:

                   (i) "Acquiring Corporation" shall mean (x) the continuing or
     surviving corporation of a consolidation or merger with Issuer (if other
     than Issuer), (y) Issuer in a merger in which Issuer is the continuing or
     surviving person, or (z) the transferee of all or substantially all of
     Issuer's assets (or a substantial part of the assets of its subsidiaries
     taken as a whole).

                   (ii)  "Substitute Common Stock" shall mean the shares of
     capital stock (or similar equity interest) with the greatest voting power
     in respect of the election of directors (or persons similarly responsible
     for the direction of the business and affairs) of the Substitute Option
     Issuer.

                   (iii)  "Assigned Value" shall mean the highest of (w) the
     price per share of Issuer Common Stock at which a Tender Offer or an
     Exchange Offer therefor has been made, (x) the price per share of Issuer
     Common Stock to be paid by any third party pursuant to an agreement with
     Issuer, (y) the highest closing price for shares of Issuer Common Stock
     within the six-month period immediately preceding the consolidation,
     merger, or sale in question and (z) in the event of a sale of all or
     substantially all of Issuer's assets or deposits an amount equal to (I) the
     sum of the price paid in such sale for such assets (and/or deposits) and
     the current market value of the remaining assets of Issuer, as determined
     by a nationally recognized investment banking firm selected by Holder
     divided by (II) the number of shares of Issuer Common Stock outstanding at
     such time. In the event that a Tender Offer or an Exchange Offer is made
     for Issuer Common Stock or an agreement is entered into for a merger or
     consolidation involving consideration other than cash, the value of the
     securities or other property issuable or deliverable in exchange for Issuer
     Common Stock shall be determined by a nationally recognized investment
     banking firm selected by Holder.

                   (iv)  "Average Price" shall mean the average closing price of
     a share of Substitute Common Stock for the one year immediately preceding
     the consolidation, merger, or sale in question, but in no event higher than
     the closing price of the shares of Substitute Common Stock on the day
     preceding such consolidation, merger or sale; provided that if Issuer is
     the issuer of the Substitute Option, the Average Price shall be computed
     with respect to a share of common stock issued by Issuer, the person
     merging into Issuer or by any company which controls such person, as Holder
     may elect.


                                     B-10
<PAGE>
 
               (f) In no event, pursuant to any of the foregoing paragraphs,
shall the Substitute Option be exercisable for more than 19.9% of the aggregate
of the shares of Substitute Common Stock outstanding prior to exercise of the
Substitute Option. In the event that the Substitute Option would be exercisable
for more than 19.9% of the aggregate of the shares of Substitute Common Stock
but for the limitation in the first sentence of this Section 7(f), Substitute
Option Issuer shall make a cash payment to Holder equal to the excess of (i) the
value of the Substitute Option without giving effect to the limitation in the
first sentence of this Section 7(f) over (ii) the value of the Substitute Option
after giving effect to the limitation in the first sentence of this Section
7(f). This difference in value shall be determined by a nationally-recognized
investment banking firm selected by Holder.

               (g) Issuer shall not enter into any transaction described in
Section 7(b) unless the Acquiring Corporation and any person that controls the
Acquiring Corporation assume in writing all the obligations of Issuer hereunder
and take all other actions that may be necessary so that the provisions of this
Section 7 are given full force and effect (including, without limitation, any
action that may be necessary so that the holders of the other shares of common
stock issued by Substitute Option Issuer are not entitled to exercise any rights
by reason of the issuance or exercise of the Substitute Option and the shares of
Substitute Common Stock are otherwise in no way distinguishable from or have
lesser economic value (other than any diminution in value resulting from the
fact that the Substitute Common Stock are restricted securities, as defined in
Rule 144 under the Securities Act or any successor provision) than other shares
of common stock issued by Substitute Option Issuer).

          8.   Repurchase at the Option of Holder.
               ---------------------------------- 

               (a) At the request of Holder at any time (i) commencing upon the
first occurrence of a Repurchase Event (as defined in Section 8(d)) and ending
18 months immediately thereafter and (ii) for 30 business days following the
occurrence of either of the events set forth in clauses (i) and (ii) of Section
3(f) (but solely as to shares of Issuer Common Stock with respect to which the
required approval was not received) Issuer (or any successor) shall repurchase
from Holder (x) the Option and (y) all shares of Issuer Common Stock purchased
by Holder pursuant hereto with respect to which Holder then has beneficial
ownership. The date on which Holder exercises its rights under this Section 8 is
referred to as the "Request Date." Such repurchase shall be at an aggregate
price (the "Section 8 Repurchase Consideration") equal to the sum of:

                   (i)  the aggregate Purchase Price paid by Holder for any
     shares of Issuer Common Stock acquired


                                     B-11
<PAGE>
 
     pursuant to the Option with respect to which Holder then has beneficial
     ownership;

                   (ii)  the excess, if any, of (x) the Applicable Price (as
     defined below) for each share of Issuer Common Stock over (y) the Purchase
     Price (subject to adjustment pursuant to Section 7), multiplied by the
     number of shares of Issuer Common Stock with respect to which the Option
     has not been exercised; and

                   (iii)  the excess, if any, of the Applicable Price over the
     Purchase Price (subject to adjustment pursuant to Section 7) paid (or, in
     the case of Option Shares with respect to which the Option has been
     exercised but the Closing Date has not occurred, payable) by Holder for
     each share of Issuer Common Stock with respect to which the Option has been
     exercised and with respect to which Holder then has beneficial ownership,
     multiplied by the number of such shares.

               (b) If Holder exercises its rights under this Section 8, Issuer
shall, within 10 business days after the Request Date, pay the Section 8
Repurchase Consideration to Holder in immediately available funds, and
contemporaneously with such payment, Holder shall surrender to Issuer the Option
and the certificates evidencing the shares of Issuer Common Stock purchased
thereunder with respect to which Holder then has beneficial ownership, and
Holder shall warrant that it has sole record and beneficial ownership of such
shares and that the same are then free and clear of all Liens. Notwithstanding
the foregoing, to the extent that prior notification to or approval of any
Regulatory Authority is required in connection with the payment of all or any
portion of the Section 8 Repurchase Consideration, Holder shall have the ongoing
option to revoke its request for repurchase pursuant to Section 8, in whole or
in part, or to require that Issuer deliver from time to time that portion of the
Section 8 Repurchase Consideration that it is not then so prohibited from paying
and promptly file the required notice or application for approval and
expeditiously process the same (and each party shall cooperate with the other in
the filing of any such notice or application and the obtaining of any such
approval) and the period of time that would otherwise run pursuant to the
preceding sentence for the payment of the portion of the Section 8 Repurchase
Consideration shall run instead from the date on which, as the case may be, (i)
any required notification period has expired or been terminated or (ii) such
approval has been obtained and, in either event, any requisite waiting period
shall have passed. If any Regulatory Authority disapproves of any part of
Issuer's proposed repurchase pursuant to this Section 8, Issuer shall promptly
give notice of such fact to Holder. If any Regulatory Authority prohibits the
repurchase in part but not in whole, then Holder shall have the right (i) to
revoke the repurchase request or (ii) to the extent permitted by such Regulatory
Authority, determine whether the repurchase


                                     B-12
<PAGE>
 
should apply to the Option and/or Option Shares and to what extent to each, and
Holder shall thereupon have the right to exercise the Option as to the number of
Option Shares for which the Option was exercisable at the Request Date less the
sum of the number of shares covered by the Option in respect of which payment
has been made pursuant to Section 8(a)(ii) and the number of shares covered by
the portion of the Option (if any) that has been repurchased; provided that if
the Option shall have terminated prior to the date of such notice or shall be
scheduled to terminate at any time before the expiration of a period ending on
the thirtieth business day after such date, Grantee shall nonetheless have the
right so to exercise the Option or exercise its rights under Section 9 until the
expiration of such period of 30 business days.  Holder shall notify Issuer of
its determination under the preceding sentence within five (5) business days of
receipt of notice of disapproval of the repurchase.

               (c) For purposes of this Agreement, the "Applicable Price" means
the highest of (i) the highest price per share of Issuer Common Stock paid for
any such share by the person or groups described in Section 8(d)(i), (ii) the
price per share of Issuer Common Stock received by holders of Issuer Common
Stock in connection with any merger or other business combination transaction
described in Section 7(b)(i), 7(b)(ii) or 7(b)(iii), or (iii) the highest
closing sales price per share of Issuer Common Stock quoted on the NYSE (or if
Issuer Common Stock is not quoted on the NYSE, the highest bid price per share
as quoted on the principal trading market or securities exchange on which such
shares are traded as reported by a recognized source chosen by Holder) during
the 40 business days preceding the Request Date; provided, however, that in the
event of a sale of less than all of Issuer's assets, the Applicable Price shall
be the sum of the price paid in such sale for such assets and the current market
value of the remaining assets of Issuer as determined by a nationally recognized
investment banking firm selected by Holder, divided by the number of shares of
the Issuer Common Stock outstanding at the time of such sale. If the
consideration to be offered, paid or received pursuant to either of the
foregoing clauses (i) or (ii) shall be other than in cash, the value of such
consideration shall be determined in good faith by an independent nationally
recognized investment banking firm selected by Holder and reasonably acceptable
to Issuer, which determination shall be conclusive for all purposes of this
Agreement.

               (d) As used herein, "Repurchase Event" shall occur if (i) any
person (other than Grantee or any subsidiary of Grantee) shall have acquired
beneficial ownership of (as such term is defined in Rule 13d-3 promulgated under
the Exchange Act), or the right to acquire beneficial ownership of, or any
"group" (as such term is defined under the Exchange Act) shall have been formed
which beneficially owns or has the right to acquire beneficial ownership of, 25%
or more of the then


                                     B-13
<PAGE>
 
outstanding shares of Issuer Common Stock, or (ii) Issuer has entered into an
agreement pursuant to which any of the transactions described in Section
7(b)(i), 7(b)(ii) or 7(b)(iii) could or will be consummated.

          9.   Registration Rights.
               ------------------- 

               (a) Demand Registration Rights.  Issuer shall, subject to the
                   --------------------------                               
conditions of Section 9(c) below, if requested by any Holder, including Grantee
and any permitted transferee ("Selling Shareholder"), as expeditiously as
possible prepare and file a registration statement under the Securities Act if
such registration is necessary in order to permit the sale or other disposition
of any or all shares of Issuer Common Stock or other securities that have been
acquired by or are issuable to the Selling Shareholder upon exercise of the
Option in accordance with the intended method of sale or other disposition
stated by the Selling Shareholder in such request, including without limitation
a "shelf" registration statement under Rule 415 under the Securities Act or any
successor provision, and Issuer shall use its best efforts to qualify such
shares or other securities for sale under any applicable state securities laws.

               (b) Additional Registration Rights.  If Issuer at any time after 
                   ------------------------------   
the exercise of the Option proposes to register any shares of Issuer Common
Stock under the Securities Act in connection with an underwritten public
offering of such Issuer Common Stock, Issuer will promptly give written notice
to the Selling Shareholders of its intention to do so and, upon the written
request of any Selling Shareholder given within 30 days after receipt of any
such notice (which request shall specify the number of shares of Issuer Common
Stock intended to be included in such underwritten public offering by the
Selling Shareholder), Issuer will cause all such shares for which a Selling
Shareholder requests participation in such registration, to be so registered and
included in such underwritten public offering; provided, however, that Issuer
may elect to not cause any such shares to be so registered (i) if the
underwriters in good faith object for valid business reasons, or (ii) in the
case of a registration solely to implement an employee benefit plan or a
registration filed on Form S-4 of the Securities Act or any successor Form;
provided, further, however, that such election pursuant to (i) may only be made
two times. If some but not all the shares of Issuer Common Stock with respect to
which Issuer shall have received requests for registration pursuant to this
Section 9(b) shall be excluded from such registration, Issuer shall make
appropriate allocation of shares to be registered among the Selling Shareholders
desiring to register their shares pro rata in the proportion that the number of
shares requested to be registered by each such Selling Shareholder bears to the
total number of shares requested to be registered by all such Selling
Shareholders then desiring to have Issuer Common Stock registered for sale.


                                     B-14
<PAGE>
 
               (c) Conditions to Required Registration.  Issuer shall use all
                   -----------------------------------                       
reasonable efforts to cause each registration statement referred to in Section
9(a) above to become effective and to obtain all consents or waivers of other
parties which are required therefor and to keep such registration statement
effective; provided, however, that Issuer may delay any registration of Option
Shares required pursuant to Section 9(a) above for a period not exceeding 90
days provided Issuer shall in good faith determine that any such registration
would adversely affect an offering or contemplated offering of other securities
by Issuer, and Issuer shall not be required to register Option Shares under the
Securities Act pursuant to Section 9(a) above:

                   (i)  prior to the earliest of (a) termination of the Plan
     pursuant to Article VII thereof, (b) failure to obtain the requisite
     shareholder approval pursuant to Section 6.01 of the Plan, and (c) a
     Purchase Event or a Preliminary Purchase Event;

                   (ii)  on more than one occasion during any calendar year;

                   (iii)  within 90 days after the effective date of a
     registration referred to in Section 9(b) above pursuant to which the
     Selling Shareholder or Selling Shareholders concerned were afforded the
     opportunity to register such shares under the Securities Act and such
     shares were registered as requested; and

                   (iv)  unless a request therefor is made to Issuer by Selling
     Shareholders that hold at least 25% or more of the aggregate number of
     Option Shares (including shares of Issuer Common Stock issuable upon
     exercise of the Option) then outstanding.

               In addition to the foregoing, Issuer shall not be required to
maintain the effectiveness of any registration statement after the expiration of
nine months from the effective date of such registration statement. Issuer shall
use all reasonable efforts to make any filings, and take all steps, under all
applicable state securities laws to the extent necessary to permit the sale or
other disposition of the Option Shares so registered in accordance with the
intended method of distribution for such shares; provided, however, that Issuer
shall not be required to consent to general jurisdiction or qualify to do
business in any state where it is not otherwise required to so consent to such
jurisdiction or to so qualify to do business.

               (d) Expenses.  Except where applicable state law prohibits such
                   --------                                                   
payments, Issuer will pay all expenses (including without limitation
registration fees, qualification fees, blue sky fees and expenses (including the
fees and expenses of counsel), legal expenses, including the reasonable fees and
expenses of one counsel to the holders whose Option Shares are


                                     B-15
<PAGE>
 
being registered, printing expenses and the costs of special audits or "cold
comfort" letters, expenses of underwriters, excluding discounts and commissions
but including liability insurance if Issuer so desires or the underwriters so
require, and the reasonable fees and expenses of any necessary special experts)
in connection with each registration pursuant to Section 9(a) or 9(b) above
(including the related offerings and sales by holders of Option Shares) and all
other qualifications, notifications or exemptions pursuant to Section 9(a) or
9(b) above.

               (e) Indemnification.  In connection with any registration under
                   ---------------                                            
Section 9(a) or 9(b) above Issuer hereby indemnifies the Selling Shareholders,
and each underwriter thereof, including each person, if any, who controls such
holder or underwriter within the meaning of Section 15 of the Securities Act,
against all expenses, losses, claims, damages and liabilities caused by any
untrue, or alleged untrue, statement of a material fact contained in any
registration statement or prospectus or notification or offering circular
(including any amendments or supplements thereto) or any preliminary prospectus,
or caused by any omission, or alleged omission, to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading, except insofar as such expenses, losses, claims, damages or
liabilities of such indemnified party are caused by any untrue statement or
alleged untrue statement that was included by Issuer in any such registration
statement or prospectus or notification or offering circular (including any
amendments or supplements thereto) in reliance upon and in conformity with,
information furnished in writing to Issuer by such indemnified party expressly
for use therein, and Issuer and each officer, director and controlling person of
Issuer shall be indemnified by such Selling Shareholders, or by such
underwriter, as the case may be, for all such expenses, losses, claims, damages
and liabilities caused by any untrue, or alleged untrue, statement, that was
included by Issuer in any such registration statement or prospectus or
notification or offering circular (including any amendments or supplements
thereto) in reliance upon, and in conformity with, information furnished in
writing to Issuer by such holder or such underwriter, as the case may be,
expressly for such use.

               Promptly upon receipt by a party indemnified under this Section
9(e) of notice of the commencement of any action against such indemnified party
in respect of which indemnity or reimbursement may be sought against any
indemnifying party under this Section 9(e), such indemnified party shall notify
the indemnifying party in writing of the commencement of such action, but the
failure so to notify the indemnifying party shall not relieve it of any
liability which it may otherwise have to any indemnified party under this
Section 9(e) unless the failure so to notify the indemnified party results in
substantial prejudice thereto. In case notice of commencement of any such action
shall be given to the indemnifying party as above provided, the


                                     B-16
<PAGE>
 
indemnifying party shall be entitled to participate in and, to the extent it may
wish, jointly with any other indemnifying party similarly notified, to assume
the defense of such action at its own expense, with counsel chosen by it and
satisfactory to such indemnified party.  The indemnified party shall have the
right to employ separate counsel in any such action and participate in the
defense thereof, but the fees and expenses of such counsel (other than
reasonable costs of investigation) shall be paid by the indemnified party unless
(i) the indemnifying party either agrees to pay the same, (ii) the indemnifying
party fails to assume the defense of such action with counsel satisfactory to
the indemnified party, or (iii) the indemnified party has been advised by
counsel that one or more legal defenses may be available to the indemnifying
party that may be contrary to the interest of the indemnified party, in which
case the indemnifying party shall be entitled to assume the defense of such
action notwithstanding its obligation to bear fees and expenses of such counsel.
No indemnifying party shall be liable for any settlement entered into without
its consent, which consent may not be unreasonably withheld.

               If the indemnification provided for in this Section 9(e) is
unavailable to a party otherwise entitled to be indemnified in respect of any
expenses, losses, claims, damages or liabilities referred to herein, then the
indemnifying party, in lieu of indemnifying such party otherwise entitled to be
indemnified, shall contribute to the amount paid or payable by such party to be
indemnified as a result of such expenses, losses, claims, damages or liabilities
in such proportion as is appropriate to reflect the relative benefits received
by Issuer, the Selling Shareholders and the underwriters from the offering of
the securities and also the relative fault of Issuer, the Selling Shareholders
and the underwriters in connection with the statements or omissions which
resulted in such expenses, losses, claims, damages or liabilities, as well as
any other relevant equitable considerations.  The amount paid or payable by a
party as a result of the expenses, losses, claims, damages and liabilities
referred to above shall be deemed to include any legal or other fees or expenses
reasonably incurred by such party in connection with investigating or defending
any action or claim; provided, however, that in no case shall any Selling
Shareholder be responsible, in the aggregate, for any amount in excess of the
net offering proceeds attributable to its Option Shares included in the
offering.  No person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Securities Act) shall be entitled to contribution from
any person who was not guilty of such fraudulent misrepresentation.  Any
obligation by any holder to indemnify shall be several and not joint with other
holders.

               In connection with any registration pursuant to Section 9(a) or
9(b) above, Issuer and each Selling Shareholder (other than Grantee) shall enter
into an agreement containing the indemnification provisions of this Section
9(e).


                                     B-17
<PAGE>
 
               (f) Miscellaneous Reporting.  Issuer shall comply with all 
                   -----------------------
reporting requirements and will do all such other things as may be necessary to
permit the expeditious sale at any time of any Option Shares by the Selling
Shareholders thereof in accordance with and to the extent permitted by any rule
or regulation promulgated by the SEC from time to time, including, without
limitation, Rule 144. Issuer shall at its expense provide the Selling
Shareholders with any information necessary in connection with the completion
and filing of any reports or forms required to be filed by them under the
Securities Act or the Exchange Act, or required pursuant to any state securities
laws or the rules of any stock exchange.

               (g) Issue Taxes.  Issuer will pay all stamp taxes in connection
                   -----------   
with the issuance and the sale of the Option Shares and in connection with the
exercise of the Option, and will save the Selling Shareholders harmless, without
limitation as to time, against any and all liabilities, with respect to all such
taxes.

          10.  Quotation; Listing.  If Issuer Common Stock or any other
               ------------------                                      
securities to be acquired in connection with the exercise of the Option are then
authorized for quotation or trading or listing on the NYSE or any securities
exchange, Issuer, upon the request of Holder, will promptly file an application,
if required, to authorize for quotation or trading or listing the shares of
Issuer Common Stock or other securities to be acquired upon exercise of the
Option on the NYSE or such other securities exchange and will use its best
efforts to obtain approval, if required, of such quotation or listing as soon as
practicable.

          11.  Division of Option.  This Agreement (and the Option granted
               ------------------                                         
hereby) are exchangeable, without expense, at the option of Holder, upon
presentation and surrender of this Agreement at the principal office of Issuer
for other Agreements providing for Options of different denominations entitling
the holder thereof to purchase in the aggregate the same number of shares of
Issuer Common Stock purchasable hereunder.  The terms "Agreement" and "Option"
as used herein include any other Agreements and related Options for which this
Agreement (and the Option granted hereby) may be exchanged.  Upon receipt by
Issuer of evidence reasonably satisfactory to it of the loss, theft, destruction
or mutilation of this Agreement, and (in the case of loss, theft or destruction)
of reasonably satisfactory indemnification, and upon surrender and cancellation
of this Agreement, if mutilated, Issuer will execute and deliver a new Agreement
of like tenor and date.  Any such new Agreement executed and delivered shall
constitute an additional contractual obligation on the part of Issuer, whether
or not the Agreement so lost, stolen, destroyed or mutilated shall at any time
be enforceable by anyone.


                                     B-18
<PAGE>
 
          12.  Miscellaneous.
               ------------- 

               (a) Expenses.  Each of the parties hereto shall bear and pay all
                   -------- 
costs and expenses incurred by it or on its behalf in connection with the
transactions contemplated hereunder, including fees and expenses of its own
financial consultants, investment bankers, accountants and counsel.

               (b) Waiver and Amendment.  Any provision of this Agreement may be
                   --------------------                                         
waived at any time by the party that is entitled to the benefits of such
provision.  This Agreement may not be modified, amended, altered or supplemented
except upon the execution and delivery of a written agreement executed by the
parties hereto.

               (c) Entire Agreement:  No Third-Party Beneficiaries; 
                   ------------------------------------------------
Severability.  This Agreement, together with the Plan and the other documents 
- -------------  
and instruments referred to herein and therein, between Grantee and Issuer (i)
constitutes the entire agreement and supersedes all prior agreements and
understandings, both written and oral, between the parties with respect to the
subject matter hereof and (ii) is not intended to confer upon any person other
than the parties hereto (other than the indemnified parties under Section 9(e)
and any transferees of the Option Shares or any permitted transferee of this
Agreement pursuant to Section 12(h)) any rights or remedies hereunder. If any
term, provision, covenant or restriction of this Agreement is held by a court of
competent jurisdiction or Regulatory Authority to be invalid, void or
unenforceable, the remainder of the terms, provisions, covenants and
restrictions of this Agreement shall remain in full force and effect and shall
in no way be affected, impaired or invalidated. If for any reason such court or
Regulatory Authority determines that the Option does not permit Holder to
acquire, or does not require Issuer to repurchase, the full number of shares of
Issuer Common Stock as provided in Section 2 (as may be adjusted herein), it is
the express intention of Issuer to allow Holder to acquire or to require Issuer
to repurchase such lesser number of shares as may be permissible without any
amendment or modification hereof.

               (d) Governing Law.  This Agreement shall be governed and 
                   -------------
construed in accordance with the laws of the Commonwealth of Pennsylvania
without regard to any applicable conflicts of law rules.

               (e) Descriptive Headings.  The descriptive headings contained 
                   -------------------- 
herein are for convenience of reference only and shall not affect in any way the
meaning or interpretation of this Agreement.

               (f) Notices.  All notices and other communications hereunder 
                   -------
shall be in writing and shall be deemed given if delivered personally,
telecopied (with confirmation) or mailed by registered or certified mail (return
receipt requested)


                                     B-19
<PAGE>
 
to the parties at the addresses set forth in the Plan (or at such other address
for a party as shall be specified by like notice).

               (g) Counterparts.  This Agreement and any amendments hereto may
                   ------------
be executed in two counterparts, each of which shall be considered one and the
same agreement and shall become effective when both counterparts have been
signed, it being understood that both parties need not sign the same
counterpart.

               (h) Assignment.  Neither this Agreement nor any of the rights,
                   ----------                                                
interests or obligations hereunder or under the Option shall be assigned by any
of the parties hereto (whether by, operation of law or otherwise) without the
prior written consent of the other party, except that Holder may assign this
Agreement to a wholly-owned subsidiary of Holder and Holder may assign its
rights hereunder in whole or in part after the occurrence of a Purchase Event.
Subject to the preceding sentence, this Agreement shall be binding upon, inure
to the benefit of and be enforceable by the parties and their respective
successors and assigns.

               (i) Further Assurances.  In the event of any exercise of the 
                   ------------------
Option by the Holder, Issuer and the Holder shall execute and deliver all other
documents and instruments and take all other action that may be reasonably
necessary in order to consummate the transactions provided for by such exercise.

               (j) Specific Performance.  The parties hereto agree that this
                   --------------------                                     
Agreement may be enforced by either party through specific performance,
injunctive relief and other equitable relief.  Both parties further agree to
waive any requirement for the securing or posting of any bond in connection with
the obtaining of any such equitable relief and that this provision is without
prejudice to any other rights that the parties hereto may have for any failure
to perform this Agreement.


                                     B-20
<PAGE>
 
          IN WITNESS WHEREOF, Issuer and Grantee have caused this Stock Option
Agreement to be signed by their respective officers thereunto duly authorized,
all as of the day and year first written above.

                                       CORESTATES FINANCIAL CORP            
                                                                            
                                       By /s/ Terrence A. Larsen  
                                         ---------------------------------
                                             Terrence A. Larsen,            
                                             Chairman and Chief Executive   
                                             Officer                        
                                                                            
                                                                            
                                       MERIDIAN BANCORP, INC.               
                                                                            
                                       By /s/ Samuel A. McCullough  
                                         ---------------------------------
                                             Samuel A. McCullough,          
                                             Chairman, President and Chief  
                                             Executive Officer               

<PAGE>
 
CoreStates Financial Corp
Broad and Chestnut Streets
PO Box 7558
Philadelphia PA 19101-7558

                                                                      Exhibit 20

                                                             [LOGO OF CORESTATES
                                                                   APPEARS HERE]

                                                                            NEWS


Contact               CoreStates: Gary Brooten, (215) 973-3546
                      Meridian: George Biechler, (610) 655-2470


                      Immediately Upon Receipt
For Release

                   CoreStates and Meridian Agree to Combine;

                Partnership Will Create a Regional Banking Power


            Philadelphia, October 10, 1995--CoreStates Financial Corp and
       Meridian Bancorp, Inc. today announced a definitive agreement to merge.
       The combination would create a $45 billion asset banking services power
       with leading geographic market positions and specialized strengths in
       serving key regional, national and global customer segments. It would
       also combine two strong-performing banking companies, both of which
       reported record third quarter earnings today. Specifically, the
       transaction would:

             o  Create a leading market position in a core region blanketing the
       prime economic centers of eastern Pennsylvania, northern Delaware and
       central New Jersey;

             o  Extend the combined banks' total market reach to 47 counties in
       the three states;

             o  Create a company with $3.7 billion of equity and with the
       capital ratios to support investments in growth and in improved services
       to customers ;

             o  Be accretive to earnings per share for 1997;

             o  Combine two companies recognized for their community leadership
       in and commitment to their markets.

            "We are taking two organizations with deep historic roots in this
       region and we are combining them into a single, focused company with the
       knowledge, the commitment and the financial resources to be an
       unparalleled resource to its customers and communities," said

                                     -more-
<PAGE>
 
                                       2

       Terrence A. Larsen, chairman and chief executive of CoreStates.

            "This is the time, this is the place, and this is the specific
       opportunity to make a clear declaration: We will be the 'hometown'
       banking company for this region, offering local decisions and local
       services with a global reach," he said. "This combination will bring
       clear benefits to all stakeholders of both organizations."

            Samuel A. McCullough, chairman and chief executive of Meridian,
       said, "The people of our two companies have worked exceptionally hard and
       effectively to make us strong competitors in our markets. This
       transaction will magnify the benefits of those efforts for all of our
       stakeholders -- shareholders, customers, employees and the communities we
       mutually serve. This is the opening of an exciting new era for us."

            The two leaders said each organization has long considered the other
       as a key player and prime potential partner.

            "It was quite natural for Meridian to explore a possible combination
       with CoreStates as part of the Meridian board's strategic study," said
       McCullough. "This combination will work best for our region. It will
       assure our ability to serve our customers superbly, and as partners we
       can strengthen our overall commitments in helping to build the future of
       our communities."

            Terms of the Transaction

            The transaction would be a tax-free exchange of 1.225 shares of
       CoreStates stock for each share of Meridian stock. Based on closing share
       prices of October 9, 1995, the transaction would be valued at
       approximately $3.2 billion. Accordingly Meridian shareholders would
       receive $47.16 in CoreStates stock for each Meridian share.

            The deal is structured as an acquisition of Meridian by CoreStates
       to be accounted for as a pooling of interests.

            The merger, which is subject to approval by shareholders of both
       companies and by regulators, is expected to close in the second quarter
       of 1996.

            As part of the agreement, Meridian and CoreStates gave each
       
                                     -more-
<PAGE>
 
                                       3

other options to purchase 19.9% of their respective stock under certain
       circumstances.

       Management Team

            Larsen, 49, will be chairman and chief executive officer of the
       expanded CoreStates organization.

            McCullough, 56, will be president and chief operating officer of the
       corporation.

            A new Office of the Chairman will also include:

              o  Rosemarie B. Greco, 49, president and chief executive officer
       of CoreStates Bank, N.A.

              o  Charles L. Coltman III, 52, vice chairman of the corporation.

              o  Charles P. Connolly, Jr., 46, senior executive vice president
       and chief risk management officer.

              o  Robert N. Gilmore, 47, chief processing services officer.

              o  David E. Sparks, 51, chief financial officer.
            Corporate headquarters will be in Philadelphia.

            Third Quarter Earnings

            Both CoreStates and Meridian issued summary reports of record
       earnings for the third quarter and major progress on implementing their
       respective process redesign/performance improvement projects.

            CoreStates reported net income of $133,946,000 or 96 cents per share
       for the third quarter and $315,283,000 or $2.23 per share for the first
       nine months. The nine-month figure included a net 47 cents per share
       restructuring charge for CoreStates' BEST process redesign project.

            Larsen said the record third quarter earnings, up 28% from a year
       earlier and representing an operating return on average assets
       of 1.85% and return on average equity of 22.91%, reflected both
       continuing strength in the company's basic businesses and the growing
       impact of BEST on expenses.

            He said the company was running ahead of schedule in achieving the
       projected ultimate financial benefits of BEST, an annualized 90 cents per
       share difference by the fourth quarter of 1996. The impact

                                     -more-
<PAGE>
 
                                       4

       on third quarter earnings was 10 cents per share, mostly in cost savings.
       The expense ratio declined to 53.7% for the quarter.

            Meridian reported net income of $54.4 million, or 96 cents per
       fully diluted share, for the third quarter and $121.5 million or $2.14
       per fully diluted share for the first nine months. The nine-
       month figure included a 37 cents per share restructuring charge in the
       second quarter for the 59.9 program.

            McCullough said the third quarter earnings, up 52% from 1994 on a
       per share basis and representing a return on average assets of 1.48% and
       return on equity of 17.33%, "reflect the underlying strength of our core
       banking operations and the success of our previously-announced '59.9'
       program designed to improve Meridian's operating performance.

            "We are especially pleased that the expense savings identified by
       the '59.9' program are being realized ahead of schedule," he said.
       Meridian's projected ultimate benefit from 59.9 is an annualized earnings
       improvement of 78 cents per share. The 59.9 impact on net income for the
       third quarter was 11 cents per share, all from cost savings. The bank
       reached an expense ratio of 59.8% for the quarter.

            Larsen and McCullough said the two organizations' projects would
       continue on their implementation plans and that as they plan
       consolidation "we expect to find ideas each is implementing that can be
       extended to the other."

            Strategic Fit and Integration Plans

            The combination will be basically an in-market merger with
       significant market overlaps, but the geographic market strengths of the
       two companies differ. For businesses that depend on branch office
       support, Meridian's strengths in Berks county and the Lehigh Valley areas
       of eastern Pennsylvania and in Delaware will complement CoreStates'
       already strong lead in the metropolitan Philadelphia region and parts of
       central New Jersey.

            Both companies are strong in the corporate "middle market", defined
       by CoreStates as companies from $15 to $250 million sales.

                                     -more-
<PAGE>
 
                                       5

       In combination, they will have a commanding market position in their core
       southeastern Pennsylvania region.

            Meridian's recognized small business strengths complement
       CoreStates' recently increased emphasis on serving this segment.

            CoreStates brings great strengths in transaction processing and
       international specialty services, while Meridian has special
       strengths in segments of the trust and investment business.

            The companies project that they will achieve merger cost
       efficiencies, in addition to the BEST and 59.9 savings, at an annual rate
       of approximately $186 million pre tax, by the time consolidation and
       conversion is completed in late 1996. CoreStates will incur a
       restructuring charge in the quarter of closing of approximately $175
       million pre-tax.

            These efforts will include a branch network review expected to
       result in consolidation, closing or sale of approximately 115 branch
       offices of the combined total of 667. The companies projected that less
       than 10% of the combined totals of 19,127 positions would be eliminated.
       To reduce the numbers of potential layoffs associated with the staff
       position cuts, the two companies froze hiring except for critical
       positions.

            Assuming closing as anticipated, the companies said they expected
       consolidations to occur within 1996. Meridian expects to close its
       pending acquisition of United Counties Trust Company in New Jersey in the
       current quarter, and CoreStates expects to carry out its planned
       consolidation of its New Jersey and Pennsylvania banks as planned in
       January of 1996.
                                      -30-


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