Exhibit 10.3

                                                                February 4, 1997


ML Bancorp, Inc.
Two Aldwyn Center
Villanova, PA 19085

Gentlemen:

     The undersigned  understands that ML Bancorp,  Inc. ("Bancorp") is about to
enter into an Agreement and Plan of Merger (the "Merger  Agreement",  as amended
- -- see amendments attached hereto) with Penncore Financial Services  Corporation
("Penncore").  The Merger  Agreement  provides  for the merger of Penncore  into
Bancorp (the  "Merger")  and the  conversion of  outstanding  shares of Penncore
Common Stock into Bancorp Common Stock and cash in accordance  with the formula
therein set forth.

     In  order to  induce  Bancorp  to enter  into  the  Merger  Agreement,  and
intending to be legally bound hereby, the undersigned  represents,  warrants and
agrees that at the Penncore Shareholders' meeting contemplated by Section 4.3 of
the Agreement  and Plan of Merger and any  adjournment  thereof the  undersigned
wi11,  in person or by proxy,  vote or cause to be voted in favor of the  Merger
Agreement and the Merger the shares of Penncore Common Stock  beneficially owned
by  the  undersigned  individually  or,  to  the  extent  of  the  undersigned's
proportionate  voting interest,  jointly with other persons,  as wel1 as (to the
extent of the undersigned's  proportionate  voting interest) any other shares of
Penncore  Common  Stock  over  which  the  undersigned  may  hereafter   acquire
beneficia1 ownership in such capacities (collectively, the "Shares"). Subject to
the final  paragraph of this agreement,  the undersigned  further agrees that it
will use its best  efforts to cause any other  shares of Penncore  Common  Stock
over  which it has or  shares  voting  power to be voted in favor of the  Merger
Agreement and the Merger.

     The  undersigned  further  represents,  warrants  and agrees that until the
earlier of (i) the  consummation  of the Merger or (ii) the  termination  of the
Merger  Agreement  in  accordance  with its  terms,  the  undersigned  will not,
directly or indirectly:

     (a) vote any of the  Shares,  or cause or  permit  any of the  Shares to be
voted, in favor of any other merger, consolidation, plan of liquidation, sale of
assets,   reclassification  or  other  transaction  involving  Penncore  or  its
subsidiary  Commonwealth State Bank ("Commonwealth") which would have the effect
of any  person  other  than  Bancorp  or an  affiliate  acquiring  control  over
Penncore, Commonwealth or any substantial





portion of the assets of  Penncore or  Commonwealth  (as used  herein,  the term
"control"  means  (1) the  ability  to direct  the  voting of 10% or more of the
outstanding  voting  securities of a person having  ordinary voting power in the
election  of  directors  or in the  election  of any other body  having  similar
functions or (2) the ability to direct the  management and policies of a person,
whether through  ownership of securities,  through any contract,  arrangement or
understanding or otherwise); or

     (b) sell or otherwise transfer any of the Shares, or cause or permit any of
the Shares to be sold or otherwise transferred (i) pursuant to any tender offer,
exchange  offer or similar  proposal made by any person other than Bancorp or an
affiliate,   (ii)  to  any  person   seeking  to  obtain  control  of  Penncore,
Commonwealth  or  any   substantial   portion  of  the  assets  of  Penncore  or
Commonwealth  or to any other person (other than Bancorp or an affiliate)  under
circumstances where such sale or transfer may reasonably be expected to assist a
person  seeking to obtain  such  control or (iii) for the  principal  purpose of
avoiding the obligations of the undersigned under this agreement.

     (c) It is understood and agreed that this  agreement  relates solely to the
capacity of the  undersigned as a shareholder or other  beneficial  owner of the
Shares and is not in any way intended to affect the exercise by the  undersigned
of the  undersigned's  responsibilities  as a director or officer of Penncore or
Commonwealth.  It is further  understood and agreed that the term "Shares" shall
not include any securities beneficially owned by the undersigned as a trustee or
fiduciary,  and that this  agreement  is not in any way  intended  to affect the
exercise by the undersigned of the  undersigned's  fiduciary  responsibility  in
respect of any such securities.

                                        Very truly yours,


                                        NATIONAL PENN INVESTMENT CO. INC.

                                        /s/ 
                                        ----------------------------------------

Accepted and Agreed to:
ML BANCORP, INC.

By: _______________________________

Title: ____________________________




                                      -2-


manner and basis of carrying it into effect, which shall be as follows:

                                   ARTICLE I
                                  THE MERGERS

     1.1 The Merger.  Subject to the terms and conditions of this Agreement,  on
the Effective  Date (as defined in Article VII),  Penncore  shall merge with and
into  Bancorp  (the  "Merger")  with  Bancorp  being the  surviving  entity,  in
accordance  with the  provisions  of,  and  with the  effect  provided  in,  the
Pennsylvania  Business  Corporation Law (the "PBCL").  At the Effective Time (as
defined in Article  VII),  the articles of  incorporation  and the bylaws of the
corporation  surviving the merger shall be the articles of incorporation and the
bylaws of Bancorp in effect  immediately  prior to the  Effective  Time.  At the
Effective Time, the directors and officers of the surviving corporation shall be
the directors  and officers of Bancorp;  provided,  that at the  Effective  Time
Bancorp  shall  cause  Owen O.  Freeman,  Jr. to become a member of the Board of
Directors of Bancorp and Main Line.

     1.2  Consideration; Effect on Outstanding Shares.

          (a)       On the  Effective  Time, by virtue of the Merger and without
any further  action on the part of Bancorp or  Penncore,  each share of Penncore
Common Stock issued and  outstanding  immediately  prior to the  Effective  Time
(other than shares of Penncore Common Stock to be cancelled  pursuant to Section
1.2(k)) shall be converted, as the case may be, into:

                    (i) the right to receive  $36.56 cash without  interest (the
          "Per Share Cash Amount");

                    (ii) the right to  receive  2.50  shares of  Bancorp  Common
          Stock (the "Exchange Ratio"); or

                    (iii) the right to receive a combination  of cash and shares
          of Bancorp  Common Stock  determined in  accordance  with this Section
          1.2;

provided, however, that no such conversion shall be made in respect of any share
of Penncore Common Stock the holder of which,  pursuant to the PBCL, is entitled
to receive  payment of the fair value of such share,  and such holder shall have
only the rights  provided in the PBCL (such  shares of Penncore  Common Stock in
respect of which the holders  thereof have perfected their rights under the PBCL
being hereinafter referred to as "Dissenting Shares").

          If the Average Price (as defined in Section  8.1(h) hereof) of Bancorp
Common Stock exceeds $16.75, the Exchange Ratio shall be decreased from 2.5 to a
number equal to $41.875 divided by the Average Price  (calculated to the nearest
1/1000);  provided,  however,  that  there  shall be no such  adjustment  in the
Exchange  Ratio if prior to the Averaging  Period (as defined in Section  8.1(h)
hereof) there has been any public  announcement  of the proposed  acquisition or
sale of all or Bancorp's Common Stock or substantially all of Bancorp's assets.

          (b) The number of shares of Penncore Common Stock to be converted into
the right to receive Bancorp Common Stock in the


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          (h) By Penncore, if Penncore's Board of Directors so determines in the
event that the Average Price (as hereinafter  defined) of Bancorp's Common Stock
is less than $12.50,  unless the Bancorp  Exchange Ratio Option (as  hereinafter
described) is exercised by Bancorp.  The Average Price equals the average of the
last reported sale prices of Bancorp's  Common Stock (as reported by NASDAQ) for
the 10  trading  days  ending on the 11th day  before  the  Effective  Date (the
"Averaging Period").  Bancorp shall have the option (the "Bancorp Exchange Ratio
Option") to increase the Exchange  Ratio to a number equal to $31.25  divided by
the Average Price  (calculated  to the nearest  1/1000).  If Penncore  elects to
terminate  pursuant to this  Section  8.1(h),  it shall give  written  notice to
Bancorp prior to the fifth  business day before the Effective  Date, and Bancorp
shall  thereupon have five business days from receipt of such notice in which to
exercise  the Bancorp  Exchange  Ratio  Option,  such  exercise to be by written
notice to Penncore.  Upon exercise of the Bancorp  Exchange  Ratio Option,  this
Agreement  shall  remain  in full  force and  effect  and  Penncore's  notice of
termination under this Section 8.1(h) shall be null and void.

     8.2 Approval by Board of Directors.  Any  termination  of this Agreement as
provided  in  Sections  8.1(a)  through  8.1(h) must be approved by the Board of
Directors of the party seeking termination.

     8.3 Effect of Termination. In the event of termination of this Agreement as
provided in Sections 8.1 through 8.9, this Agreement shall forthwith become null
and void and there shall be no liability or obligation on the part of Bancorp or
Penncore or their respective  officers or directors,  except that nothing herein
shall  relieve any party hereto from any  liability  for willful  breach of this
Agreement,  and except for (a) the agreements and representations of the parties
contained  in this  Section 8.3 and  Sections  9.3,  9.4,  9.7 and 9.9;  (b) the
obligations of confidentiality contained in Section 9.6; and (c) the obligations
of  the  parties  and  liabilities  contained  in  Section  9.5,  all  of  which
agreements, representations,  obligations and liabilities shall survive any such
termination.


                                   ARTICLE IX
                                 OTHER MATTERS

     9.1 Survival.  If the Effective Time occurs,  the agreements of the parties
contained in Sections 1.1, 9.4, 9.5, 9.11, 9.12, 9.13 and 9.14 shall survive the
Effective Time; all other representations,  warranties, agreements and covenants
contained in this Agreement shall not survive the Effective Time.

     9.2 Waiver;  Amendment.  Prior to the Effective Date, any provision of this
Agreement may be (I) waived by the party  benefitted by the  provision,  or (ii)
amended or modified at any time (including the structure of the transaction), by
an agreement


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