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                                                                    EXHIBIT 99.1
 
                             SHAREHOLDER AGREEMENT
 
     This SHAREHOLDER AGREEMENT ("Agreement") is made as of May   , 1995, by and
between ELDORADO BANCORP, a California corporation ("Eldorado") and the other
persons executing the last page of this Agreement, who are shareholders of
Mariners Bancorp (the "Shareholders"). All terms not otherwise defined in this
Agreement shall have the meanings ascribed to them in the Merger Agreement (as
that term is defined below).
 
     A. Eldorado and Mariners, a California corporation ("Mariners"), are
planning to enter into an Agreement and Plan of Reorganization and Merger (the
"Merger Agreement"), to be dated as of the date hereof. The Merger Agreement
provides for a statutory merger (the "Merger") pursuant to which Mariners will
be merged with and into Eldorado Bank, which is a wholly-owned subsidiary of
Eldorado, the separate existence of Mariners will terminate and the shareholders
of Mariners will receive, in exchange for their shares of Mariners Common Stock,
a combination of shares of common stock of Eldorado and cash, all as more fully
set forth in the Merger Agreement.
 
     B. In order to induce Eldorado and Eldorado Bank ("EB") to enter into the
Merger Agreement, and as consideration therefor, the Shareholders, solely in
their capacity as shareholders, desires to take certain actions and to refrain
from taking other actions in connection with the Merger.
 
     NOW, THEREFORE, in consideration of these premises and of the
representations, warranties, covenants, and agreements contained in this
Agreement and in the Merger Agreement, the parties agree as follows:
 
     1. Agreements of the Shareholders.
 
          1.1 Agreement to Vote.  At any meeting of shareholders of Mariners to
     be held to vote on approval of, or in connection with any solicitation of
     Mariners shareholders for written consents to, the Merger or any of the
     transactions contemplated thereby, the Shareholders agree, jointly and
     severally, that they will vote or cause to be voted (or, in the case of a
     solicitation of written consents, to give their written consents with
     respect to) all shares of common stock of Mariners ("Mariners Stock") that
     the Shareholders own, either individually or jointly, or hereafter acquire,
     or over which either or both of the Shareholders exercise or hereafter
     acquire the right to exercise voting power (the "Shareholders' Mariners
     Stock"), in favor of and to approve the Merger, on the terms provided in
     the Merger Agreement, the consummation of the transactions contemplated
     thereby and any other matters provided in the Merger Agreement that require
     the approval of the shareholders of Mariners.
 
          1.2 Restrictions on Dispositions.  The Shareholders agree that until
     the earliest of (i) the adjournment of the meeting of shareholders called
     to vote on approval of the Merger, (ii) the termination of the Merger
     Agreement in accordance with the terms thereof and prior to and without the
     consummation of the Merger, or (iii) March 31, 1996, the Shareholders shall
     not sell, assign or otherwise dispose of any shares of the Shareholders'
     Mariners Stock (except pursuant to the Merger or as provided below) or
     relinquish, assign or otherwise transfer any of their rights to vote, or
     grant consents with respect to, such shares of Shareholder's Mariners
     Stock, or enter into any agreement to do any of the foregoing other than
     with Eldorado or an affiliate of Eldorado or with the prior written consent
     of Eldorado, unless (i) notwithstanding the sale of other transfer or
     disposition of any such shares, the Shareholders shall have retained full
     voting power with respect to such shares, including the sole right to vote
     and grant consents with respect to such shares in accordance with
     Subsection 1.1 hereof, or (ii) the person to whom such shares shall have
     been sold, assigned or otherwise transferred or disposed of shall have
     agreed, in writing, to be bound by the provisions of this Agreement, or
     (iii) the transfer is involuntary, such as a transfer on death or by one of
     the Shareholders to the other Shareholder; and except that the Shareholders
     may grant a written proxy to vote any or all of such shares to a
     proxyholder under irrevocable instructions requiring such proxyholder to
     vote all of such shares at any meeting held or pursuant to any written
     consent solicited to vote on approval of the Merger and the transactions
     contemplated thereby in accordance with the requirements of Subsection 1.1
     hereof.
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          1.3 Cooperation.  At all times during which the Shareholders'
     agreements contained in Subsections 1.1 or 1.2 above are in effect, the
     Shareholders agree not to directly or indirectly solicit or initiate any
     inquiries, proposals or offers from any person or entity (other than from
     Eldorado or any affiliate of Eldorado) relating to, any proposal or
     transaction for disposition of the business or assets of Mariners or any of
     its Subsidiaries, the acquisition or sale of securities of Mariners or any
     Subsidiary of Mariners, or any other transaction or proposal that comes
     within the definition of "Acquisition Transaction" or the definition of
     "Acquisition Proposal" as such terms are defined in the Merger Agreement.
     The Shareholders shall recommend to other shareholders of Mariners that
     they vote in favor of and to approve the Merger, on the terms provided in
     the Merger Agreement, the consummation of the transactions contemplated
     thereby and any other matters provided in the Merger Agreement that require
     the approval of the shareholders of Mariners, and the Shareholders shall
     not revoke such recommendation.
 
     2. Representations and Warranties of the Shareholders.
 
     Each of the Shareholders represents and warrants to Eldorado as follows:
 
          2.1 Capacity.  Such Shareholder has the requisite capacity and
     authority to enter into and perform such Shareholder's obligations under
     this Agreement.
 
          2.2 Binding Agreement.  This Agreement constitutes the valid and
     legally binding obligation of such Shareholder which is enforceable against
     such Shareholder in accordance with its terms and shall be binding on his
     or her heirs, representatives, executors and successors and assigns and
     shall inure to Eldorado and its successors and assigns.
 
          2.3 Noncontravention.  The execution and delivery of this Agreement by
     such Shareholder does not, and the performance by such Shareholder of the
     Shareholder's obligations under this Agreement and the consummation by such
     Shareholder of the transactions contemplated by this Agreement will not in
     any material respect violate or conflict with, nor shall such execution and
     delivery or performance constitute a material default under, any agreement,
     instrument, contract or other obligation, or any order, arbitration award,
     judgment or decree to which such Shareholder is a party or by which such
     Shareholder or any of his or her shares of Mariners Stock is bound or
     subject, or any statute, rule or regulation to which such Shareholder or
     any of the Shareholder's property, including his or her shares of Mariners
     Stock, is subject. Attached hereto are copies of any voting trust or other
     agreements governing the transferability or other disposition, or the
     voting, of any of the shares of the Shareholders' Mariners Stock.
 
          2.4 Ownership of and Voting Power of Shares.  Schedule A to this
     Agreement correctly set forth (i) the number of shares of Mariners Stock
     owned by the Shareholders with respect to which the Shareholders, either
     individually or jointly, have sole voting and dispositive power, (ii) the
     number of shares of Mariners Stock, if any, owned by others over which
     either of the Shareholders holds the full power to vote. Schedule A also
     sets the number of shares of Mariners Stock, if any, that is owned by
     either or both of the Shareholders but as to which voting power is held by
     or shared with any third person or entity and the identity of such person
     and shares of Mariners Stock held by either Shareholder in a representative
     or fiduciary capacity (that is, for example, as a trustee, executor, or
     corporate officer or agent or as a partner of a partnership that is the
     beneficial owner of the shares).
 
     3. Enforcement.
 
          3.1 Damages Inadequate; Specific Performance.  In the event of a
     threatened or actual breach of this Agreement by either of the
     Shareholders, it is agreed that damages would not be an adequate remedy to
     compensate Eldorado. Accordingly, each party agrees that each Shareholder's
     obligations will be enforceable by court order requiring specific
     performance without proof of damages or posting of any bond. In the event
     of a threatened or actual breach of this Agreement by the Shareholder,
     Eldorado will be entitled to a temporary restraining order and to temporary
     and permanent injunctive relief to prevent or terminate such threatened or
     actual breach, provided that nothing in this Agreement shall be construed
     to limit the damages otherwise recoverable by Eldorado in any such event.
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          3.2 Notice to Third Parties.  Within      days of the date hereof, the
     Shareholders shall cause to be delivered to Mariners all stock certificates
     evidencing the Shareholders' shares of Mariners Stock and Mariners shall
     cause the following legend to be endorsed thereon:
 
        "THE SHARES EVIDENCED BY THIS CERTIFICATE ARE SUBJECT TO A SHAREHOLDER
        AGREEMENT DATED MAY   , 1995, BETWEEN THE HOLDER(S) HEREOF AND ELDORADO
        BANCORP WHICH RESTRICTS IN CERTAIN RESPECTS THE VOTING OF SUCH SHARES
        AND SALES, TRANSFERS OR OTHER DISPOSITIONS OF SUCH SHARES IN THE ABSENCE
        OF AN AGREEMENT, IN WRITING, BY THE TRANSFEREE TO COMPLY WITH SUCH
        SHAREHOLDER AGREEMENT."
 
     In addition, after notice to the Shareholders, Eldorado will have the right
     to inform any person or entity that Eldorado reasonably believes to be, or
     to be contemplating, participating with either Shareholder (or receiving
     assistance from either Shareholder) in violation of this Agreement, that
     any participation with either Shareholder in activities in violation of
     this Agreement may give rise to claims by Eldorado against such entity or
     person.
 
     4. Miscellaneous.
 
          4.1 Expenses.  Each party will pay that party's costs and expenses,
     including attorneys and accounting fees, in connection with this Agreement
     and the transactions contemplated by this Agreement.
 
          4.2 Notices.  All notices and other communications hereunder shall be
     in writing and, if delivered personally, mailed by registered or certified
     mail (return receipt requested), sent by confirmed overnight courier or
     telecopied (with electronic confirmation and verbal confirmation of the
     person to whom such telecopy is addressed), shall be deemed to have been
     given on the date actually delivered or three days following the date
     mailed, as the case may be, to the parties at the following addresses: If
     to Eldorado:
 
              Eldorado Bancorp
               c/o Eldorado Bank Administration
               19100 Von Karman Avenue, Suite 550
               Irvine, California 92713
               Attention: Chief Executive Officer
 
          If to the Shareholders:
 
               To their address as maintained on the books and records of
               Mariners;
 
     or to such other address as a party may have furnished to the other in
     writing in accordance with this paragraph, except that notices of change of
     address shall only be effective upon receipt.
 
          4.3 Assignment; Third Party Beneficiaries.  This Agreement is not
     assignable by any party hereto, except with the prior consent of the other
     parties. Each party intends that this Agreement shall not benefit, or
     create any right or cause of action in or on behalf of, any person other
     than the parties, except for EB, which is an intended third party
     beneficiary of the agreements and representations and warranties of the
     Shareholders contained in this Agreement. As used in this Agreement, the
     term party or parties shall refer only to Eldorado and the Shareholders.
 
          4.4 Counterparts.  This Agreement may be executed in one or more
     counterparts, all of which taken together shall constitute one instrument.
     An executed counterpart received by telecopy shall have the same effect as
     an originally-executed counterpart.
 
          4.5 Governing Law.  This Agreement will be governed by California law,
     without regard to any applicable principles of conflicts of law.
 
          4.6 Captions.  The captions contained in this Agreement are for
     convenience of reference only and do not form a part of this Agreement.
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          4.7 Waiver and Modification.  No waiver of any term, provision or
     condition of this Agreement, whether by conduct or otherwise, shall be
     deemed to be a further or continuing waiver of any such term, provision or
     condition. This Agreement may be modified or amended only by an instrument
     signed by the parties.
 
          4.8 Attorney Fees.  If any party brings an action or suit, at law or
     in equity, against any other party by reason of such party's breach of any
     covenant, representation, warranty or other provision of this Agreement,
     the prevailing party in whose favor final judgment is entered shall be
     entitled to recover from the losing party all reasonable costs and expenses
     incurred by the prevailing party in connection with such suit or action,
     including legal fees and court costs (whether or not taxable as such).
 
          4.9 Entire Agreement.  This Agreement embodies the entire
     understanding of the parties with respect to its subject matter, and there
     are no other agreements or understandings, written or oral, in effect
     between the parties relating to the subject matter of this Agreement,
     unless expressly referred to in this Agreement.
 
          4.10 Severability.  Whenever possible, each provision of this
     Agreement shall be interpreted in such manner as to be valid under
     applicable law. However, if any provision shall be invalid or
     unenforceable, it shall be construed and limited to effectuate its purpose
     to the maximum legally permissible extent. If it cannot be so construed so
     as to be valid under such law, such provision shall be ineffective to the
     extent of such invalidity or prohibition without invalidating the remainder
     of such provision or the remaining provisions of this Agreement, and this
     Agreement shall be construed to the maximum extent possible to carry out
     its terms without such invalid or unenforceable provision or portion.
 
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the date first above written.
 

                                              
SHAREHOLDERS:                                    ELDORADO BANCORP
 
- --------------------------------------------
                                                 Its: -------------------------------------
 
- --------------------------------------------
 
                                                 MARINERS BANCORP*
 
                                                 By:
                                                 --------------------------------------------
                                                 Its:
                                                 --------------------------------------------
                                                 * Mariners is executing this Agreement only
                                                  with respect to Section 3.2 of this
                                                  Agreement.

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                                   SCHEDULE A
 
Names of Shareholders:
- ------------------------
 
                                                        ------------------------
 
     Number of Shares of Mariners Stock:
 

                                                                    
        (1)  which are owned by Shareholders and as to which
             they have the sole right to exercise voting power:           ---------------------
 
        (2)  which are NOT owned by either Shareholder, but as
             to which either of them has the sole right to
             exercise voting power:                                       ---------------------
 
        (3)  which are owned by Shareholders, but as to which
             another Person has the right to exercise voting
             power                                                        ---------------------
 
        (4)  as to which the voting power is shared with another
             Person                                                       ---------------------

 
Identities of Persons who hold or share voting power with respect to any shares
of Mariners Stock that are owned by Shareholder:
 


                     NAME                                      NUMBER OF SHARES
  -------------------------------------------     -------------------------------------------
                                               
 

 
List of Agreements to which any of the Shareholder's shares of Mariners Stock
are subject or bound, true and correct copies of which are attached: