FIRST FINANCIAL BANKSHARES INC
S-4, 1994-01-10
STATE COMMERCIAL BANKS
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<PAGE>

     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 10, 1994.
                                                     REGISTRATION NO. 33-_______
================================================================================
                                                                                
                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                             ----------------------

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

                        FIRST FINANCIAL BANKSHARES, INC.
             (Exact name of registrant as specified in its charter)
                             ----------------------

       TEXAS                              6712                 75-0944023
(STATE OR OTHER JURISDICTION       (PRIMARY STANDARD         (I.R.S. EMPLOYER
    OF INCORPORATION            INDUSTRIAL CLASSIFICATION    IDENTIFICATION NO.)
    OR ORGANIZATION)                   CODE NUMBER)

                                400 PINE STREET
                             ABILENE, TEXAS 79601
                                (915) 675-7155
              (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
       INCLUDING AREA CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)

                               CURTIS R. HARVEY
                         EXECUTIVE VICE PRESIDENT AND
                            CHIEF FINANCIAL OFFICER
                       FIRST FINANCIAL BANKSHARES, INC.
                                400 PINE STREET
                             ABILENE, TEXAS 79601
                                (915) 675-7155
           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE OF AGENT FOR SERVICE)
                             ----------------------

                                   Copies to:
 N. KATHLEEN FRIDAY, P.C.      DAVID L. BUHRMANN         PATRICK J. KENNEDY, JR.
   AKIN, GUMP, STRAUSS,     MCMAHON, SUROVIK, SUTTLE,    KENNEDY & BARIS, L.L.P.
   HAUER & FELD, L.L.P.    BUHRMANN, COBB & HICKS, P.C.   112 EAST PECAN STREET
1700 PACIFIC AVENUE,             P.O. BOX 3679                  SUITE 1775
     SUITE 4100                ABILENE, TX 79604          SAN ANTONIO, TX 78205
DALLAS, TEXAS 75201-4618              
 

  Approximate date of commencement of proposed sale to public:  As soon as
practicable after the registration statement becomes effective.

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

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

                             ----------------------
<TABLE> 
<CAPTION>
                                    CALCULATION OF REGISTRATION FEE
========================================================================================================
                                                  PROPOSED MAXIMUM     PROPOSED MAXIMUM       AMOUNT OF
     TITLE OF EACH CLASS OF        AMOUNT TO BE    OFFERING PRICE          AGGREGATE        REGISTRATION
 SECURITIES TO BE REGISTERED(1)     REGISTERED      PER SHARE(1)       OFFERING PRICE(1)       FEE(1)
- --------------------------------------------------------------------------------------------------------
<S>                                   <C>              <C>               <C>                   <C>
Common Stock.....................     232,550          $30.55            $7,104,403            $2,452
========================================================================================================
</TABLE>

(1) The registration fee has been computed pursuant to Rule 457(f)(2) under the
    Securities Act of 1933, as amended (the "Securities Act"), based on the book
    value of the shares of Common Stock of Concho Bancshares, Inc. at September
    30, 1993 that may be exchanged for the securities being registered.  The
    proposed maximum offering price per share has been determined by dividing
    the maximum aggregate offering price by the number of shares being
    registered.

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

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

================================================================================
<PAGE>

                        FIRST FINANCIAL BANKSHARES, INC.

            CROSS-REFERENCE SHEET SHOWING LOCATION IN THE PROSPECTUS
                  OF INFORMATION REQUIRED BY ITEMS OF FORM S-4
<TABLE>
<CAPTION>
 
FORM S-4 ITEM NUMBER AND CAPTION                                     PROSPECTUS CAPTION
- --------------------------------                                     ------------------
<C>  <S>                                            <C>
 1.  Forepart of the Registration Statement and
     Outside Front Cover Page of Prospectus.......   Outside Front Cover Page 

 2.  Inside Front and Outside Back Cover Pages of
     Prospectus...................................   Inside Front Cover Page;  Available Information;
                                                     Incorporation by Reference; Table of Contents

 3.  Ratio of Earnings to Fixed Charges and Other
     Information..................................   Prospectus Summary; Summary Financial Data;
                                                     Pro Forma Combined Selected Financial Data; 
                                                     Comparative Per Share Data

 4.  Terms of the Transaction.....................   The Exchange Offer; Description of First Financial
                                                     Capital Stock; Comparison of Shareholder Rights

 5.  Pro Forma Financial Information..............   Pro Forma Combined Selected Financial Data

 6.  Material Contacts With the Company Being
     Acquired.....................................   *

 7.  Additional Information Required for
     Reoffering by Persons and Parties Deemed to
     be Underwriters..............................   *

 8.  Interests of Named Experts and Counsel.......   *

 9.  Disclosure of Commission Position on
     Indemnification of Securities Act Liabilities   *

10.  Information with Respect to S-3 Registrants..   Available Information; Incorporation by Reference;
                                                     Prospectus Summary; Summary Financial Data;
                                                     Certain Regulatory Considerations; Information 
                                                     About First Financial

11.  Incorporation of Certain Information by
     Reference....................................   Incorporation by Reference

12.  Information with Respect to S-2 or S-3
     Registrants..................................   *

13.  Incorporation of Certain Information by
     Reference....................................   *

14.  Information with Respect to Registrants Other
     than S-3 or S-2 Registrants..................   *

15.  Information With Respect to S-3 Companies....   *

16.  Information With Respect to S-2 or S-3
     Companies....................................   *

17.  Information With Respect to Companies Other
     than S-2 or S-3 Companies....................   Prospectus Summary; Summary Financial Data;
                                                     Information About Concho; Consolidated Financial
                                                     Statements

18.  Information if Proxies, Consents or
     Authorizations are to be Solicited...........   *

19.  Information if Proxies, Consents, or
     Authorizations are not to be Solicited, or in
     an Exchange Offer............................   The Exchange Offer; Incorporation by Reference;
                                                     Information About Concho

</TABLE>
- -----------
* Not applicable.
<PAGE>

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ Information contained herein is subject to completion or amendment.  A       +
+ registration statement relating to these securities has been filed with the  +
+ Securities and Exchange Commission.  These securities may not be sold nor    +
+ may offers to buy be accepted prior to the time the registration statement   +
+ becomes effective.  This Prospectus shall not constitute an offer to sell or +
+ the solicitation of an offer to buy nor shall there be any sale of these     +
+ securities in any State in which such offer, solicitation or sale would be   +
+ unlawful prior to registration or qualification under the securities laws    +
+ of any State.                                                                +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++



                 SUBJECT TO COMPLETION, DATED JANUARY 10, 1994

OFFERING CIRCULAR/
- ------------------
PROSPECTUS
- ----------
                               OFFER TO EXCHANGE
                                ALL OUTSTANDING
                           SHARES OF COMMON STOCK OF
                            CONCHO BANCSHARES, INC.
                                      FOR
                           SHARES OF COMMON STOCK OF

                                FIRST FINANCIAL
                                BANKSHARES, INC.

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

                               THE EXCHANGE OFFER
                     WILL EXPIRE AT 5:00 P.M., TEXAS TIME,
                               ON _________, 1994

  First Financial Bankshares, Inc., a Texas corporation ("First Financial" or
the "Company"), hereby offers, upon the terms and subject to the conditions set
forth in this Prospectus and the accompanying letter of transmittal (the "Letter
of Transmittal," and together with this Prospectus, the "Exchange Offer"), to
exchange shares of its voting common stock, par value $10.00 per share ("First
Financial Common Stock"), which have been registered under the Securities Act of
1933, as amended (the "Securities Act"), pursuant to a Registration Statement
(as defined herein) of which this Prospectus is a part, for all of the issued
and outstanding shares of stock of Concho Bancshares, Inc., a Texas corporation
("Concho"), par value $0.50 per share ("Concho Common Stock").  Upon
consummation of the Exchange Offer, each outstanding share of Concho Common
Stock tendered in the Exchange Offer will, subject to certain provisions with
respect to fractional shares, be exchanged (the "Exchange") for 1.15 shares of
First Financial Common Stock, subject to certain adjustments.

  Subject to the terms and conditions of the Exchange Offer, First Financial
will accept for exchange all shares of Concho Common Stock that are validly
tendered on or prior to 5:00 p.m., Texas time, on the date the Exchange Offer
expires, which will be ___________, 1994 (the "Expiration Date"), unless the
Exchange Offer is extended.  Once shares of Concho Common Stock are tendered in
the Exchange Offer, they may not be withdrawn. The Exchange Offer is subject to
certain conditions, including a condition that at least 90% of the outstanding
Concho Common Stock be tendered in the Exchange Offer. See "The Exchange
Offer--Conditions to Consummation of the Exchange Offer; Termination."

  Upon consummation of the Exchange Offer, it is anticipated that Concho will be
merged (the "Merger") with and into a wholly-owned subsidiary of First Financial
and that any remaining Concho Shareholders will receive in the Merger the same
consideration they would have received had they participated in the Exchange
Offer, subject to their rights to dissent to the Merger. This Prospectus also
relates to the shares of First Financial Common Stock that may be issued in the
Merger.

  Prior to the Exchange Offer, there has been no public market for the Concho
Common Stock.  The First Financial Common Stock is traded in the
over-the-counter market and reported on the NASDAQ National Market under the
trading symbol "FFIN." On January 6, 1994, the closing price of the First
Financial Common Stock, as reported by NASDAQ, was $________.

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

  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THE PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

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


                The date of this Prospectus is ___________, 1994
<PAGE>

  THE EXCHANGE OFFER IS NOT BEING MADE TO, NOR WILL FIRST FINANCIAL ACCEPT
SURRENDERS FOR EXCHANGE FROM, HOLDERS OF CONCHO COMMON STOCK IN ANY JURISDICTION
IN WHICH THE EXCHANGE OFFER OR THE ACCEPTANCE THEREOF WOULD NOT BE IN COMPLIANCE
WITH THE SECURITIES OR BLUE SKY LAWS OF SUCH JURISDICTION.

                             AVAILABLE INFORMATION

  First Financial Bankshares, Inc. (which until October 26, 1993 was named
"First Abilene Bankshares, Inc.") is subject to the informational requirements
of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith files reports and other information with the Securities and
Exchange Commission (the "Commission").  The reports and other information filed
by the Company with the Commission can be inspected and copied at the Commission
at Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 10549,
and at the following regional offices of the Commission: 7 World Trade Center,
New York, New York 10048; and Northwestern Atrium Center, 500 West Madison
Street, Room 1400, Chicago, Illinois 60661-2511.  Copies of such information can
be obtained from the Public Reference Section of the Commission, 450 Fifth
Street, N.W., Washington, D.C. 10549, at prescribed rates.

  This Prospectus constitutes a part of a registration statement (the
"Registration Statement") filed by the Company with the Commission under the
Securities Act.  As permitted by the rules and regulations of the Commission,
this Prospectus does not contain all of the information contained in the
Registration Statement and the exhibits and schedules thereto, and reference is
hereby made to the Registration Statement and the exhibits and schedules thereto
for further information with respect to the Company and the securities offered
hereby.  Statements contained herein concerning the provisions of any documents
filed as an exhibit to the Registration Statement  or otherwise filed with the
Commission are not necessarily complete, and in each instance reference is made
to the copy of such document so filed.  Each such statement is qualified in its
entirety by such reference.

                           INCORPORATION BY REFERENCE
                                        
  THIS PROSPECTUS INCORPORATES DOCUMENTS BY REFERENCE THAT ARE NOT PRESENTED
HEREIN OR DELIVERED HEREWITH.  COPIES OF ANY SUCH DOCUMENTS, OTHER THAN EXHIBITS
TO SUCH DOCUMENTS THAT ARE NOT SPECIFICALLY INCORPORATED BY REFERENCE THEREIN,
ARE AVAILABLE WITHOUT CHARGE TO ANY PERSON, INCLUDING ANY SHAREHOLDER OF CONCHO
TO WHOM THIS PROSPECTUS IS DELIVERED, UPON ORAL OR WRITTEN REQUEST TO CURTIS R.
HARVEY, EXECUTIVE VICE PRESIDENT AND CHIEF FINANCIAL OFFICER, FIRST FINANCIAL
BANKSHARES, INC., P.O. BOX 701, ABILENE, TEXAS 79604, TELEPHONE NUMBER (915)
675-7155.  IN ORDER TO ENSURE TIMELY DELIVERY OF THE DOCUMENTS, ANY REQUEST
SHOULD BE MADE BY _______________, 1994.

  First Financial's Annual Report on Form 10-K for the fiscal year ended
December 31, 1992, First Financial's Quarterly Reports on Form 10-Q for the
quarters ended March 31, 1993, June 30, 1993 and September 30, 1993 and First
Financial's Current Reports on Form 8-K dated April 23, 1993, September 23,
1993, October 26, 1993, and December 7, 1993, in each case filed with the
Commission pursuant to Section 13 of the Exchange Act, and the description of
First Financial Common Stock which is contained in First Financial's
Registration Statement on Form 8-A dated March 29, 1974, filed under Section 12
of the Exchange Act, as amended by Amendment No. 1 to Form 8-A on Form 8-A/A No.
1 dated January 7, 1994, are incorporated into this Prospectus by reference.

  All documents filed by First Financial pursuant to Sections 13(a), 13(c), 14
or 15(d) of the Exchange Act after the date of this Prospectus shall be deemed
to be incorporated by reference in this Prospectus and to be a part hereof from
the respective dates of filing of such documents.  Any statement contained in a
document incorporated or deemed to be incorporated by reference herein shall be
deemed to be modified or superseded

                                       2
<PAGE>

for purposes of this Prospectus to the extent that such statement is modified or
superseded by a statement contained herein or in any other subsequently filed
document which also is or is deemed to be incorporated by reference herein.  Any
such statement so modified or superseded shall not be deemed, except as so
modified or superseded, to constitute a part of this Prospectus.

  No person is authorized to give any information or to make any representations
other than those contained in this Prospectus, and, if given or made, such
information or representation must not be relied upon as having been authorized
by First Financial or Concho.  This Prospectus does not constitute an offering
within any jurisdiction to any person to whom it is unlawful to make such offer
within such jurisdiction.

  The information herein concerning First Financial has been obtained from
various fillings by First Financial under the Exchange Act and from management.
The information herein concerning Concho has been obtained from the management
of Concho.

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
 
                                                                         PAGE
                                                                         ----
 
<S>                                                                      <C>
PROSPECTUS SUMMARY.....................................................    5
  The Parties..........................................................    5
  Summary of the Transaction...........................................    6
SUMMARY FINANCIAL DATA.................................................    9
FIRST FINANCIAL AND SUBSIDIARIES SELECTED FINANCIAL DATA...............   10
CONCHO AND SUBSIDIARIES SELECTED FINANCIAL DATA........................   11
FIRST FINANCIAL AND SUBSIDIARIES AND CONCHO AND SUBSIDIARIES PRO FORMA
  COMBINED SELECTED FINANCIAL DATA.....................................   12
COMPARATIVE PER SHARE DATA.............................................   13
THE EXCHANGE OFFER.....................................................   15
  General..............................................................   15
  Background of the Exchange Offer.....................................   15
  First Financial Reasons for the Exchange Offer.......................   16
  Concho's Reasons for the Exchange Offer..............................   16
  The Exchange Rate....................................................   17
  The Expiration Date..................................................   18
  Conditions to Consummation of the Exchange Offer; Termination........   18
  Exchange of Shares and Certificates..................................   20
  Guaranteed Delivery Procedures.......................................   21
  Fractional Shares....................................................   21
  No Withdrawal Rights.................................................   22
  Regulatory Approvals Required........................................   22
  Federal Income Tax Consequences......................................   22
  Exchange Agent.......................................................   23
  Resale by Concho Affiliates..........................................   23
  Anticipated Merger and Dissenting Shareholders' Rights...............   24
  Accounting Treatment.................................................   25
CERTAIN REGULATORY CONSIDERATIONS......................................   25
  General..............................................................   25
  Payment of Dividends.................................................   25
  Certain Transactions by First Financial with its Affiliates..........   26
  Capital..............................................................   26
  First Financial Support of the First Financial Banks.................   28
 
</TABLE>

                                       3
<PAGE>

<TABLE>
<CAPTION> 

                                                                         PAGE
                                                                         ----
<S>                                                                      <C>
 
  FDIC Insurance Assessments...........................................   28
  FDICIA...............................................................   28
DESCRIPTION OF FIRST FINANCIAL CAPITAL STOCK...........................   29
COMPARISON OF SHAREHOLDER RIGHTS.......................................   30
  Board of Directors...................................................   30
  Indemnification and Limitation of Liability of Directors and 
   Officers............................................................   30
  Special Meetings of Shareholders.....................................   31
INFORMATION ABOUT FIRST FINANCIAL......................................   31
  General..............................................................   31
  Market Prices of and Dividends Paid on First Financial Common Stock..   32
INFORMATION ABOUT CONCHO...............................................   33
  General..............................................................   33
  Market Area..........................................................   33
  Services.............................................................   33
  Competition..........................................................   34
  Employees............................................................   34
  Properties...........................................................   34
  Market for and Dividends Paid on Concho Common Stock.................   34
  Security Ownership of Certain Beneficial Owners......................   34
  Security Ownership of Management.....................................   35
SELECTED CONSOLIDATED FINANCIAL DATA OF CONCHO.........................   37
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
  RESULTS OF OPERATION OF CONCHO.......................................   39
LEGAL MATTERS..........................................................   54
EXPERTS................................................................   54
INDEX TO CONSOLIDATED FINANCIAL STATEMENTS OF CONCHO...................   55
ANNEX A - OPINION OF ARMSTRONG, BACKUS & CO., L.L.P.
ANNEX B - ARTICLE 5.16 OF THE TEXAS BUSINESS CORPORATION ACT
</TABLE>

                                       4
<PAGE>

                               PROSPECTUS SUMMARY

  The following is a summary of certain information contained elsewhere in this
Prospectus.  As this summary is necessarily incomplete, reference is made to,
and this summary is qualified in its entirety by, the more detailed information
contained or incorporated by reference in this Prospectus and the Annexes
hereto. Shareholders of Concho are urged to read the Prospectus and the Annexes
hereto in their entirety.

                                  THE PARTIES

  The Company is a Texas corporation and a multi-bank holding company registered
under the Bank Holding Company Act of 1956, as amended (the "BHCA").  On October
28, 1993, the Company changed its name from "First Abilene Bankshares, Inc." to
"First Financial Bankshares, Inc." First Financial owns, through its
wholly-owned Delaware subsidiary, First Financial Bankshares of Delaware, Inc.,
all of the capital stock of six banks organized and located in Texas:  First
National Bank of Abilene, Abilene, Texas; Hereford State Bank, Hereford, Texas;
First National Bank, Sweetwater, Texas; Eastland National Bank, Eastland, Texas;
The First National Bank in Cleburne, Cleburne, Texas; and Stephenville Bank and
Trust Co., Stephenville, Texas (collectively, the "First Financial Banks"). 
First Financial operates principally in order to give the First Financial Banks
access to additional management and technical resources which enable them to
provide expanded banking services while continuing their local activity and
autonomy.  The First Financial Banks are engaged in the general commercial
banking business consisting of the acceptance of checking, savings and time
deposits, the making of loans, including bank credit card services, transmitting
funds and performing such other banking services as are usual and customary for
commercial banks.  While all First Financial Banks, with the exception of
Eastland National Bank, have trust powers, only First National Bank of Abilene,
First National Bank, Sweetwater and Stephenville Bank and Trust Co. have active
trust departments.  As of September 30, 1993, First Financial and its
consolidated subsidiaries had total assets of approximately $906.8 million,
total deposits of approximately $809.1 million, total loans (net of allowance
for loan losses) of approximately $359.1 million and total shareholders' equity
of approximately $88.7 million. First Financial's principal executive offices
are located at 400 Pine Street, Abilene, Texas 79601, and its telephone number
is (915) 675-7155.  See "Information About First Financial."

  Concho Bancshares, Inc. ("Concho") is a one bank holding company formed in
1979 and incorporated in the State of Texas. Concho owns 99.8% of Southwest Bank
of San Angelo, Texas ("Southwest Bank" or "SWB"). Southwest Bank is chartered in
the State of Texas, began operations in 1975, and its deposits are insured by
the Federal Deposit Insurance Corporation. Southwest Bank's wholly owned
subsidiary, SWB Investment Centre, Inc. ("SWB Investment"), operates as a
registered investment advisor. Southwest Bank conducts business principally in
Tom Green County through its location in San Angelo, Texas. The market area of
SWB Investment is also Tom Green County, with a small amount derived from other
area counties. Southwest Bank provides a full range of both commercial and
consumer banking services including loans, checking accounts, savings programs,
safe deposit facilities, access to automated teller machines, and credit card
programs. The bank does not offer trust services. SWB Investment offers
investment advice to customers who may execute trades with the bank through its
discount brokerage operation or through its affiliation with Stephens, Inc. of
Little Rock, Arkansas. As of September 30, 1993, as adjusted for a November 1993
stock issuance by Concho, Concho and its consolidated subsidiaries had total
assets of approximately $89.5 million, total deposits of approximately $80.9
million, total loans (net of allowance for loan losses) of approximately $43.4
million and total shareholders' equity of approximately $6.2 million. Concho's
principal executive offices  are located at 3471 Knickerbocker, San Angelo,
Texas 76906-0410 and its telephone number is (915) 944-2502. See "Information
about Concho".

                                       5
<PAGE>

                          SUMMARY OF THE TRANSACTION

THE EXCHANGE OFFER

  Pursuant to a Stock Exchange Agreement and Plan of Reorganization dated as of
December 7, 1993 by and among First Financial, Concho and Southwest Bank (the
"Exchange Agreement"), First Financial is offering to acquire from the
shareholders of Concho (the "Concho Shareholders") all outstanding shares of
Concho Common Stock in exchange for shares of First Financial Common Stock at
the exchange rate specified below.  THE CONCHO BOARD OF DIRECTORS HAS DETERMINED
THAT THE EXCHANGE OFFER IS FAIR TO THE CONCHO SHAREHOLDERS.  See "The Exchange
Offer."

THE EXCHANGE RATE

  First Financial will issue and exchange 1.15 shares of First Financial Common
Stock for each share of Concho Common Stock tendered by the Concho Shareholders
who accept the Exchange Offer during the time period the Exchange Offer is in
effect; provided, however, that the rate of exchange (the "Exchange Rate") shall
be subject to adjustment under certain conditions discussed herein.  See "The
Exchange Offer -- The Exchange Rate."  First Financial will not issue any
fractional shares of First Financial Common Stock. Concho Shareholders who would
otherwise be entitled to receive fractional shares of First Financial Common
Stock will be paid in cash for such fractional shares based upon the Market
Value (as defined herein) per share of First Financial Common Stock as of the
date which is ten days prior to the later of (i) the date First Financial
receives written notice that the Board of Governors of the Federal Reserve
System has given final approval of the application filed by First Financial to
acquire all of the Concho Common Stock and (ii) the date upon which the
Registration Statement of which this Prospectus is a part becomes effective.

THE EXPIRATION DATE

  Unless otherwise extended by First Financial, the offer by First Financial to
exchange First Financial Common Stock for Concho Common Stock shall terminate at
5:00 p.m., Texas time on ______________, 1994 (the "Expiration Date").

CONDITIONS TO CONSUMMATION OF THE EXCHANGE OFFER; TERMINATION

  Consummation of the Exchange Offer is subject to certain conditions, including
without limitation, the valid tender by Concho Shareholders of at least ninety
percent (90%) of Concho Common Stock; the receipt of all required regulatory
approvals and the lapse of certain waiting periods with respect to such
approvals; the receipt by First Financial of an opinion from its independent
accountants that the transaction will be accounted for as a "pooling of
interests"; the receipt by Concho of an opinion from its independent public
accountants and/or tax counsel that the Exchange will not be considered a
taxable event for federal income tax purposes; the receipt by Concho of written
agreement of the holders of thirteen promissory notes issued by Concho of such
holders' willingness to consent to the transfer of such obligations and certain
collateral securing them to Southwest Bank; the receipt of opinion of counsel as
to certain corporate matters; the absence of material changes in the financial
condition of either Concho or Southwest Bank; and the absence of legal or
governmental action with respect to the Exchange Offer.

  The Exchange Offer may be terminated at any time (a) by mutual consent of
First Financial and Concho, (b) by either party if the other party shall have
breached a representation or warranty which constitutes a material adverse
change from that represented in the Exchange Agreement or if any of the
conditions to consummating the Exchange Offer are not satisfied or waived, or
(c) by either party if a court or governmental body shall have taken any action
restraining, enjoining or otherwise prohibiting the Exchange or the Merger

                                       6
<PAGE>

(as defined herein) and such action shall be final and nonappealable. If the
Exchange Offer is terminated without the acceptance by First Financial of any
shares of Concho Common Stock tendered, all shares so tendered will be promptly
returned to the tendering Concho Shareholders. See "The Exchange Offer
- -Conditions to Consummation of the Exchange; Termination."

EXCHANGE OF SHARES AND CERTIFICATES

  The Concho Shareholders are receiving with this Prospectus a letter of
transmittal for acceptance of the Exchange Offer (the "Letter of Transmittal"). 
Each Concho Shareholder wishing to accept the Exchange Offer must complete, sign
and date the Letter of Transmittal, or a facsimile thereof, in accordance with
the instructions contained herein and therein, and mail or otherwise deliver the
Letter of Transmittal, or such facsimile, together with the certificates
reflecting ownership of Concho Common Stock (the "Concho Common Stock
Certificates") to be exchanged and any other required documentation to the
Exchange Agent at the address set forth herein and therein.  The delivery of the
Letter of Transmittal with the Concho Common Stock Certificates shall be deemed
to constitute an acceptance of the Exchange Offer to the extent of the number of
shares of Concho Common Stock reflected on the Concho Common Stock Certificates
accompanying the Letter of Transmittal.

  Upon expiration of the Exchange Offer and satisfaction of certain conditions
to the consummation of the Exchange Offer, if First Financial receives written
notice from the Exchange Agent that at least ninety percent (90%) of the
outstanding shares of Concho Common Stock have been validly tendered to First
Financial, then First Financial will promptly cause to be issued and mailed to
Concho Shareholders who have tendered shares of Concho Common Stock, by
registered mail, certificates of First Financial Common Stock ("First Financial
Common Stock Certificates") representing 1.15 shares of First Financial Common
Stock for each share of Concho Common Stock received by the Exchange Agent.  Any
cash payment to which a Concho Shareholder may be entitled in place of
fractional shares of First Financial Common Stock will be included with the
First Financial Common Stock Certificates mailed to the Concho Shareholders.

  Any beneficial holder whose shares of Concho Common Stock are registered in
the name of such holder's broker, dealer, commercial bank, trust company or
other nominee and who wishes to tender in the Exchange Offer should contact the
registered holder promptly and instruct such registered holder to tender on his
or her behalf.  If such beneficial holder wishes to tender on his or her own
behalf, such beneficial holder must, prior to completing and executing the
Letter of Transmittal and delivering the Concho Common Stock Certificates,
either make appropriate arrangements to register ownership of the shares of
Concho Common Stock in such holder's name or obtain a properly completed stock
power from the registered holder.  The transfer of record ownership may take
considerable time.  See "The Exchange Offer - Exchange of Shares and
Certificates."

GUARANTEED DELIVERY PROCEDURES

  Concho Shareholders who wish to tender their shares of Concho Common Stock and
whose Concho Common Stock Certificates are not immediately available or who
cannot deliver their Concho Common Stock Certificates and a properly completed
Letter of Transmittal or any other documents required by the Letter of
Transmittal to the Exchange Agent prior to the Expiration Date may tender their
shares of Concho Common Stock according to the guaranteed delivery procedures
set forth in "The Exchange Offer -- Guaranteed Delivery Procedures."

                                       7
<PAGE>

NO WITHDRAWAL RIGHTS

  Shares tendered pursuant to the Exchange Offer may not be withdrawn.

THE EXCHANGE AGENT

  The Exchange Agent for purposes of the Exchange Offer discussed herein shall
be the Trust Department of First National Bank of Abilene, Third Floor, 400 Pine
Street, Abilene, Texas 79601.

FEDERAL INCOME TAX CONSEQUENCES

  Consummation of the Exchange Offer is conditioned on receipt by Concho of a
written opinion from its independent accountants and/or tax counsel that the
exchange of shares of Concho Common Stock will not be considered a taxable event
for federal income tax purposes.  Concho has received an opinion to such effect
from its independent accountants, Armstrong, Backus & Co., L.L.P. A copy of
their opinion, which is subject to certain qualifications and assumptions, is
attached hereto as Annex A. See "The Exchange Offer -- Federal Income Tax
Consequences."

ANTICIPATED MERGER AND DISSENTING SHAREHOLDERS' RIGHTS

  First Financial anticipates that, upon consummation of the Exchange Offer,
Concho will be merged (the "Merger") with and into a wholly-owned Delaware
subsidiary of the Company with any remaining Concho Shareholders receiving in
the Merger the same consideration they would have received had they participated
in the Exchange Offer, subject to their rights to dissent from the Merger.  See
"The Exchange Offer --Anticipated Merger and Dissenting Shareholders' Rights."

REGULATORY APPROVALS

  The Exchange Offer and Merger are subject to prior approval by the Federal
Reserve Board. The approval of the Federal Reserve Board has been obtained. See
"The Exchange Offer--Regulatory Approvals Required."

INTERESTS OF CERTAIN PERSONS IN THE EXCHANGE

  As of December 15, 1993, the directors and executive officers of Concho
beneficially owned 49,465 shares of Concho Common Stock, representing
approximately 25% of Concho Common Stock outstanding. See "Information about
Concho--Security Ownership of Management."

                                       8
<PAGE>

                             SUMMARY FINANCIAL DATA

  The following tables present on a historical basis selected consolidated
financial data for (i) First Financial, (ii) Concho, and (iii) combined pro
forma data for First Financial and Concho.  The financial data are based on the
consolidated financial statements of First Financial and Concho, respectively,
incorporated herein by reference or contained elsewhere in this Prospectus and
should be read in conjunction with the applicable financial statements,
including the notes thereto.  As noted in the tables, certain historical
financial data for Concho for the nine months ended September 30, 1993 have been
adjusted to reflect the rescission in November 1993 of an earlier treasury stock
purchase by Concho of 16,267 shares of Concho Common Stock. The pro forma data
give effect to the Exchange and the Merger, in each case accounted for as a
pooling of interests and based upon a conversion of each share of Concho Common
Stock into 1.15 shares of First Financial Common Stock.  All per share data of
First Financial have been adjusted to reflect the ten percent (10%) stock
dividend paid to First Financial shareholders in the second quarter of 1993.

  The unaudited pro forma financial information presented is for informational
purposes only and is not necessarily indicative of results of operations or
financial position that would have been reported had the Exchange or the Merger,
as the case may be, been completed at the beginning of the period or as of the
date for which such unaudited pro forma information is presented, nor is such
information indicative of future results of operations or financial position.

                                       9
<PAGE>

                        FIRST FINANCIAL AND SUBSIDIARIES
                            SELECTED FINANCIAL DATA
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<TABLE>
<CAPTION>
 
                                                                                                NINE MONTHS ENDED
                                                    YEAR ENDED DECEMBER 31,                       SEPTEMBER 30,
                                  ------------------------------------------------------  ---------------------------
                                    1988      1989      1990       1991         1992          1992           1993
                                  --------  --------  --------  -----------  -----------  -------------  ------------
 
<S>                               <C>       <C>       <C>       <C>          <C>          <C>            <C>
CONSOLIDATED SUMMARY OF
  INCOME STATEMENT DATA:
  Interest income...............  $ 55,329  $ 58,062  $ 57,804     $ 61,822     $ 55,574       $ 42,126      $ 40,789
  Interest expense..............    31,168    32,233    31,443       32,238       21,415         16,828        13,494
                                  --------  --------  --------     --------     --------       --------      --------
 
  Net interest income...........    24,161    25,829    26,361       29,584       34,159         25,298        27,295
  Provision for loan losses.....     3,743     3,767     2,695        1,120          940            623           352
  Noninterest income............     6,052     6,669     7,953        8,371        8,649          6,418         7,095
  Noninterest expense...........    20,189    20,587    21,280       24,413       25,881         19,101        20,607
                                  --------  --------  --------     --------     --------       --------      --------
 
  Income before income taxes....     6,281     8,144    10,339       12,422       15,987         11,992        13,431
  Provision (benefit) for income
   taxes .......................     1,011     1,824     2,756        3,777        4,998          3,728         4,340
                                  --------  --------  --------     --------     --------       --------      --------
 
  Net income before cumulative
   effect of accounting change .     5,270     6,320     7,583        8,645       10,989          8,264         9,091
 
  Cumulative effect of
   accounting change(1) ........        --        --        --           --           --             --         1,255
                                  --------  --------  --------     --------     --------       --------      --------
 
  Net income....................  $  5,270  $  6,320  $  7,583     $  8,645     $ 10,989       $  8,264      $ 10,346
                                  ========  ========  ========     ========     ========       ========      ========
 
  Net income per First
  Financial Common Share before
   cumulative effect of
   accounting change ...........  $   1.35  $   1.67  $   2.06     $   2.35     $   2.95       $   2.22      $   2.43
                                  ========  ========  ========     ========     ========       ========      ========
 
  Net income per First
    Financial Common Share......  $   1.35  $   1.67  $   2.06     $   2.35     $   2.95       $   2.22      $   2.76
                                  ========  ========  ========     ========     ========       ========      ========
 
CONSOLIDATED PER SHARE DATA
  APPLICABLE TO FIRST FINANCIAL
    COMMON STOCK:
  Net income....................  $   1.35  $   1.67  $   2.06     $   2.35     $   2.95       $   2.22      $   2.76
  Cash dividends declared.......      0.55      0.60      0.70         0.82         0.95           0.70          0.88
  Book value at period end......     15.83     17.06     18.44        19.94        21.87          21.38         23.70
 
CONSOLIDATED BALANCE SHEET
  DATA AT PERIOD END:
  Investment securities.........  $256,210  $263,067  $287,533     $356,222     $370,633       $359,182      $407,261
  Loans, net of allowance for
   loan losses .................   277,630   271,213   312,060      303,461      323,591        307,291       359,095
  Total assets..................   672,025   688,588   794,863      834,500      839,474        798,546       906,788
  Deposits......................   601,857   609,443   709,007      751,172      750,445        709,594       809,126
  Total liabilities.............   611,386   625,654   727,037      760,972      758,041        718,983       818,098
  Total shareholders' equity....    60,638    62,935    67,826       73,528       81,433         79,563        88,690
- ---------------------------- 
</TABLE>
(1)  As of January 1, 1993, First Financial recorded the cumulative effect of
the change in accounting for income taxes to comply with Statement of Financial
Accounting Standards No. 109.

                                       10
<PAGE>

                            CONCHO AND SUBSIDIARIES
                            SELECTED FINANCIAL DATA
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<TABLE>
<CAPTION>
                                                                                         NINE MONTHS ENDED
                                           YEAR ENDED DECEMBER 31,                         SEPTEMBER 30,
                                -----------------------------------------------------    ------------------
                                    1988        1989      1990      1991       1992        1992      1993
                                ----------    -------   --------  --------  ---------    --------  --------
<S>                             <C>           <C>       <C>       <C>       <C>          <C>       <C>           
CONSOLIDATED SUMMARY OF
  INCOME STATEMENT DATA:
  Interest income.............  $  5,714      $  6,118   $  6,437  $  6,305  $  5,867     $  4,514  $  4,479
  Interest expense............     3,585         4,050      4,028     3,674     2,788        2,172     1,758
                                --------      --------   --------  --------  --------     --------  --------
 
  Net interest income.........     2,129         2,068      2,409     2,631     3,079        2,342     2,721
  Provision for loan losses...       590           247        195       120       205           67       105
  Noninterest income..........       634           405        714       861     1,116          835       857
  Noninterest expense.........     2,079         2,235      2,609     2,894     3,054        2,310     2,519
                                --------      --------   --------  --------  --------     --------  --------
 
  Income (loss) before income
   taxes .....................        94            (9)       319       478       936          800       954
  Provision (benefit) for
   income taxes ..............       --            --         --         47       191          225       348
                                --------      --------   --------  --------  --------     --------  --------
 
  Net income before cumulative
   effect of accounting change
   ...........................        94            (9)       319       431       745          575       606
 
  Cumulative effect of
   accounting change(1) ......      --             --         --        --        --           --       (231)
                                --------      --------   --------  --------  --------     --------  --------
 
  Net income (loss)...........  $     94      $     (9)  $    319   $   431  $    745     $    575  $    375
                                ========      ========   ========  ========  ========     ========  ========
 
  Net income (loss) per
    Concho Common Share before
     cumulative effect of
     accounting change .......  $  0.45       $  (0.04)  $   1.52  $   2.05  $   3.70     $   2.84  $ 3.01(2)
                                ========      ========   ========  ========  ========     ========  ========
 
  Net income (loss) per
      Concho Common Share.....  $   0.45      $  (0.04)  $   1.52  $   2.05  $   3.70     $   2.84  $ 1.86(2)
                                ========      ========   ========  ========  ========     ========  ========
 
CONSOLIDATED PER SHARE DATA
  APPLICABLE TO CONCHO
    COMMON STOCK:
  Net income (loss)...........  $   0.45      $  (0.04)  $   1.52  $   2.05  $   3.70     $   2.84  $ 1.86(2)
  Cash dividends declared.....       --           0.25       0.25      0.25      0.25          --      --
  Book value at period end....     19.14         20.58      21.79     24.21     28.30        27.70   30.55(2)
 
CONSOLIDATED BALANCE SHEET
  DATA AT PERIOD END:
  Investment securities.......  $ 20,006      $ 18,220   $ 21,813  $ 28,697  $ 33,807     $ 32,018  $34,798
  Loans, net of allowance for
   loan losses ...............    33,518        33,734     34,627    39,158    42,597       43,458   43,364
  Total assets................    66,360        71,396     72,089    80,808    88,864       84,447   89,455(2)
  Deposits....................    58,953        65,082     65,535    73,665    81,097       76,867   80,903
  Short-term borrowings.......
  Long-term debt..............
  Total liabilities...........    62,354        67,071     67,506    75,720    83,158       78,861   83,294
  Total shareholders' equity..     4,006         4,325      4,583     5,088     5,706        5,586    6,161(2)

</TABLE> 
- -------------------------------------
(1)  As of January 1, 1993, Concho recorded the cumulative effect of the change
in accounting for income taxes to comply with Statement of Financial Accounting
Standards No. 109.
(2)  As adjusted to reflect the rescission in November 1993 of an earlier 
treasury stock purchase by Concho of 16,267 shares of Concho Common Stock for
$344,860.

                                       11
<PAGE>

                      FIRST FINANCIAL AND SUBSIDIARIES AND
                            CONCHO AND SUBSIDIARIES

                   PRO FORMA COMBINED SELECTED FINANCIAL DATA
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<TABLE>
<CAPTION>
 
                                                                                         NINE MONTHS ENDED
                                                        YEAR ENDED DECEMBER 31,             SEPTEMBER 30,
                                                 ------------------------------------  -----------------------
                                                     1990        1991        1992         1992         1993
                                                 -----------  ----------  -----------  -----------  ----------
 
<S>                                              <C>         <C>          <C>          <C>         <C>            
CONSOLIDATED SUMMARY OF
  INCOME STATEMENT DATA:
  Interest income..............................    $ 64,241     $ 68,127     $ 61,441    $ 46,640     $ 45,268
  Interest expense.............................      35,471       35,912       24,203      19,000       15,252
                                                   --------     --------     --------    --------     --------
 
  Net interest income..........................      28,770       32,215       37,238      27,640       30,016
  Provision for loan losses....................       2,890        1,240        1,145         690          457
  Noninterest income...........................       8,667        9,232        9,765       7,253        7,952
  Noninterest expense..........................      23,889       27,307       28,935      21,411       23,126
                                                   --------     --------     --------    --------     --------
 
  Income before income taxes...................      10,658       12,900       16,923      12,792       14,385
  Provision for income taxes...................       2,756        3,824        5,189       3,953        4,688
                                                   --------     --------     --------    --------     --------
 
  Net income before cumulative effect of
   accounting change ..........................       7,902        9,076       11,734       8,839        9,697
 
  Cumulative effect of accounting change(1)....          --           --           --          --        1,024
                                                   --------     --------     --------    --------     --------
 
  Net income...................................    $  7,902     $  9,076     $ 11,734    $  8,839     $ 10,721
                                                   ========     ========     ========    ========     ========
 
  Net income per First Financial Common Share
   before cumulative effect of accounting
   change .....................................    $   2.03     $   2.31     $   2.96    $   2.24     $   2.44(2)
                                                   ========     ========     ========    ========     ========
 
  Net income per First Financial Common Share..    $   2.03     $   2.31     $   2.96    $   2.24     $   2.70(2)
                                                   ========     ========     ========    ========     ========
 
CONSOLIDATED PER SHARE DATA
  APPLICABLE TO FIRST FINANCIAL
    COMMON SHARES:
  Net income...................................    $   2.03     $   2.31     $   2.97    $   2.24     $   2.70(2)
  Cash dividends declared......................        0.70         0.82         0.95        0.70         0.88
  Book value at period end.....................       18.42        19.95        21.98       21.54        23.87(2)
 
CONSOLIDATED BALANCE SHEET
  DATA AT PERIOD END:
  Investment securities........................    $309,346     $384,919     $404,440    $391,200     $442,059   
  Loans, net of allowance for loan losses......     346,687      342,619      366,188     350,749      402,459   
  Total assets.................................     866,952      915,308      928,338     882,993      996,243(2) 
  Deposits.....................................     774,542      824,837      831,542     786,461      890,029   
  Short-term borrowings........................       1,314        2,272          173         450          130   
  Long-term debt...............................       9,364           --        1,151       1,260        1,174   
    Total shareholders' equity                       72,409       78,615       87,139      85,149       94,851(2) 

</TABLE> 
- ---------------------------------- 
(1) As of January 1, 1993, First Financial and Concho recorded the cumulative
effect of the change in accounting for income taxes to comply with Statement
of Financial Accounting Standards No. 109.
(2) As adjusted to reflect the rescission in November 1993 of an earlier 
treasury stock purchase by Concho of 16,267 shares of Concho Common Stock for
$344,860.

                                       12
<PAGE>

                          COMPARATIVE PER SHARE DATA

                                  (UNAUDITED)

  The following table sets forth for the First Financial Common Stock and the
Concho Common Stock certain historical, pro forma and pro forma equivalent per
share financial information.  The pro forma data give effect to the Exchange and
the Merger, in each case accounted for as a pooling of interests and based upon
a conversion of each share of Concho Common Stock into 1.15 shares of First
Financial Common Stock. The pro forma financial data have been included as
required by the rules of the Commission and are provided for comparative
purposes only.  The information presented below should be read in conjunction
with the separate financial statements of First Financial and Concho, including
the applicable notes, included or incorporated by reference elsewhere herein. 
All per share data of First Financial have been adjusted to reflect the ten
percent (10%) stock dividend paid to First Financial shareholders in the second
quarter of 1993. Historical Concho financial data for the nine months ended
September 30, 1993 have been adjusted to reflect the rescission in November 1993
of an earlier treasury stock purchase by Concho of 16,267 shares of Concho
Common Stock for $344,860.

  The unaudited pro forma financial information presented is for informational
purposes only and is not necessarily indicative of results of operations or
financial position that would have been reported had the Exchange or the Merger,
as the case may be, been completed at the beginning of the period or as of the
date for which such unaudited pro forma information is presented, nor is such
information indicative of future results of operations or financial position.
<TABLE>
<CAPTION>
 
                                                  FIRST FINANCIAL                   CONCHO
                                             -----------------------     ------------------------------
                                                         PRO FORMA                        EQUIVALENT
                                             HISTORICAL   COMBINED       HISTORICAL(2)     PRO FORMA(3)
                                             ----------  ----------      ------------    --------------
<S>                                          <C>         <C>             <C>             <C>
Common Shareholders' Equity:
December 31, 1992..........................      $19.94      $21.98           $28.30        $25.34
September 30, 1993.........................       23.70       23.87            30.55         27.45
 
Cash Dividends Declared:(1)
  Year ended December 31:                 
  1990.....................................      $ 0.70      $ 0.70           $ 0.25        $ 0.81
  1991.....................................        0.82        0.82             0.25          0.94
  1992.....................................        0.95        0.95             0.25          1.09
  Nine Months ended September 30, 1993.....        0.88        0.88               --          1.01
 
Net Income:
Year ended December 31, 1990:
  Primary..................................      $ 2.06      $ 2.02           $ 1.52        $ 2.32
  Fully diluted............................        2.06        2.02             1.52          2.32
Year ended December 31, 1991:
  Primary..................................        2.35        2.32             2.05          2.67
  Fully diluted............................        2.35        2.32             2.05          2.67
Year ended December 31, 1992:
  Primary..................................        2.95        2.97             3.70          3.41
  Fully diluted............................        2.95        2.97             3.70          3.41
Nine Months ended September 30, 1993:(4)
  Primary..................................        2.43        2.44             3.01          2.81
  Fully diluted............................        2.43        2.44             3.01          2.81
 
</TABLE>
- ----------------------------
(1) The First Financial pro forma combined dividends per share amounts represent
    historical dividends declared per share only on First Financial Common 
    Stock.
(2) Historical Concho financial data for the nine months ended September 30,
    1993 have been adjusted to reflect the rescission in November 1993 of an
    earlier treasury stock purchase by Concho of 16,267 shares of Concho Common
    Stock for $344,860.

                                       13
<PAGE>

(3) The Concho pro forma equivalent per share amounts are calculated by
    multiplying the First Financial pro forma per share amounts by the Exchange
    Rate of 1.15.  See "The Exchange Offer."
(4) For the nine months ended September 30, 1993, per share data is based on
    continuing operations before cumulative effect of the change in accounting 
    for income taxes.

                                       14
<PAGE>

                               THE EXCHANGE OFFER

  The information in this Prospectus concerning the terms of the Exchange Offer
is a summary only and is qualified in its entirety by reference to the Exchange
Agreement which is incorporated herein by reference.

GENERAL

  Pursuant to the  Exchange Agreement, First Financial is offering to acquire
from the Concho Shareholders all of the issued and outstanding Concho Common
Stock.  In exchange for each share of Concho Common Stock, the Concho
Shareholders shall receive 1.15 shares of First Financial Common Stock, unless
certain conditions require adjustments to the Exchange Rate.  See "-- The
Exchange Rate."

  At least ninety percent (90%) of the Concho Common Stock must be tendered by
the Concho Shareholders in order for the Exchange to occur.  The Exchange Offer
is also subject to certain other conditions.  See "-- Conditions to Consummation
of the Exchange Offer."

BACKGROUND OF THE EXCHANGE OFFER

  Southwest Bank is a correspondent bank customer of First National Bank of
Abilene. Through that relationship, Mr. Kenneth Murphy, the Chairman, President
and Chief Executive Officer of First Financial, visited with Mr. David Drake,
the Chairman and Chief Executive Officer of Concho, in December 1992 to obtain
information about the brokerage operation at Southwest Bank. Southwest Bank
provided brokerage services through an arrangement with the Stephens Co., and
First Financial was considering establishing a similar operation. Over the next
several months there were additional discussions about brokerage services. First
Financial had been interested in the San Angelo market for several years and
during a visit on April 30, 1993, Mr. Murphy asked Mr. Drake if Concho would
have any interest in discussing the possibility of becoming associated with
First Financial.

  Following several telephone discussions, Mr. Murphy and Curtis Harvey,
Executive Vice President and Chief Financial Officer of First Financial, met
with Concho's Executive Committee on June 1, 1993. During the meeting Mr. Murphy
stated that First Financial considered Southwest Bank an attractive acquisition
candidate and inquired as to whether Concho would be interested in entertaining
an offer. Prior to the approach by First Financial, the Board of Directors of
Concho had adopted and was following a strategic business plan that called for
growth primarily through internal means. The plan included the possibility of
Concho acquiring other banks, but did not contemplate Concho being acquired. In
light of First Financial's indication of interest, Concho's Executive Committee
decided to proceed with further discussions.

  Messrs. Murphy and Harvey met with the Concho Executive Committee again on
June 22, 1993. During the meeting Mr. Murphy presented various alternative
initial proposals for structuring an acquisition of Concho by First Financial,
including a one-for-one stock exchange. Subsequent to the meeting, Mr. Drake
contacted Mr. Murphy and informed him that Concho would entertain an offer which
included a stock exchange valued at 1.5 times Concho book value. Messrs. Murphy
and Harvey met with Mr. Drake in San Angelo on July 12, 1993, to discuss further
the possible offer by First Financial.

  The Concho Board of Directors held several meetings in late July and early
August to discuss the possible transaction and ultimately concluded, with the
assistance of its outside advisors, that an exchange offer valued at 1.5 times
Concho's book value was fair. In reaching its conclusion, the Concho Board of
Directors relied in part on the advice of its financial consulting firm, FinSer
Corporation, which evaluated the financial condition of First Financial and the
relative benefits of the offer to Concho Shareholders. FinSer Corporation
informally advised the Concho Board that, in its opinion, the offer was fair and
reasonable in light of current market conditions.

                                       15
<PAGE>

  On August 17, 1993, First Financial and Concho executed a Letter of Intent
which contemplated a stock exchange ratio of 1.2 shares of First Financial stock
for each share of Concho stock. During the period August 19, 1993, through
September 24, 1993, First Financial performed a due diligence review at
Southwest Bank and the parties began negotiating a definitive agreement.

  Following execution of the Letter of Intent, Concho informed First Financial
that a former stockholder of Concho had asserted a claim against Concho with
respect to Concho's purchase in May 1993 of 16,267 shares of Concho Common Stock
from such former stockholder. On November 29, 1993, Concho and the former
stockholder resolved the matter by rescinding the May 1993 stock purchase. As a
result of the additional shares outstanding following the rescission, First
Financial and Concho agreed to adjust the exchange ratio from 1.2 to 1.15, and
First Financial and Concho executed the Stock Exchange Agreement on December 7,
1993. In agreeing to the adjustment in the exchange ratio, the Concho Board of
Directors noted that since the date of execution of the Letter of Intent, the
market value of First Financial Common Stock had increased approximately $2.00
per share based on the NASDAQ quoted bid price.  The Concho Board considered
this increase and the fact that the exchange ratio is 1.5 times the book value
of Concho in approving the Stock Exchange Agreement. For these and other reasons
described below, the Concho Board believed it was in the best interest of the
Concho Shareholders to approve the Stock Exchange Agreement so that Concho
Shareholders would have the opportunity to accept or reject the Exchange Offer.

FIRST FINANCIAL REASONS FOR THE EXCHANGE OFFER

  It is part of First Financial's current business strategy to expand its
activities to areas in Texas where management believes there are long-term
opportunities that will benefit First Financial and its shareholders. First
Financial recently acquired two other community banks which has enabled First
Financial to increase its penetration of the Texas banking markets. The
acquisition of Concho will allow First Financial to continue its expansion and
enter the San Angelo market which is larger than those served by recent
acquisitions, thereby providing even greater asset and earnings growth
opportunities.

  First Financial also views favorably the perceived compatibility of the Concho
management team with management of First Financial and its demonstrated success
in providing quality banking services.

  In addition, First Financial believes that in light of the acceleration in the
number and size of combinations currently occurring within the financial and
banking industries and the likelihood that future changes in banking laws will
provide further impetus to consolidation of banking entities, it is desirable
for First Financial to continue to grow through acquisition of quality community
banks in favorable markets.

CONCHO REASONS FOR THE EXCHANGE OFFER

  The terms of the Exchange Offer, including the Exchange Rate, were the result
of arms' length negotiations between First Financial and Concho and their
respective representatives. Concho consulted with its own legal counsel and
financial advisors during the course of negotiations. The Concho Board of
Directors believes that the Exchange Offer is fair to the shareholders of
Concho. In reaching a conclusion to approve the Exchange Offer, Concho's Board
of Directors considered a number of factors. Concho's Board of Directors did not
assign any relative or specific weights to the factors considered. Among other
things, the Concho Board of Directors considered:

1. The financial terms of the Exchange Offer. In this regard, Concho's Board of
   -----------------------------------------                                   
   Directors took into account the premium represented by the consideration
   offered to Concho Shareholders in relation to the book value per share of
   Concho's Common Stock. Concho's Board of Directors was of the view that the
   Exchange Rate represented a fair multiple of Concho's per share book value 
   and historical and projected earnings. Concho's Board of Directors also 
   considered the financial terms of other recent business combinations

                                       16
<PAGE>

   in the banking industry and determined that the financial terms of the
   Exchange Offer compared favorably to such other transactions;

2. Certain financial and other information concerning First Financial. Such
   ------------------------------------------------------------------      
   information included, but was not limited to, the financial condition, asset
   quality, historical earnings and historical operations of First Financial
   Common Stock and the dividend yield of First Financial Common Stock;

3. The terms, other than the financial terms, and structure of the Exchange
   ------------------------------------------------------------------------
   Offer. In particular, the Concho Board of Directors considered the 
   -----
   anticipated tax-free nature of the Exchange Offer to Concho Shareholders
   receiving First Financial Common Stock in exchange for the shares of Concho
   Common Stock.

  In addition to the above factors, the proposed Exchange Offer and Merger
reflect the judgment of the Board of Directors of Concho that Concho's business
can be benefitted by the resources and experience of First Financial, that the
Exchange Offer and Merger may produce an entity better able to meet competitive
challenges inherent in the banking industry, and that the affiliation of First
Financial and Concho could provide operational benefits and efficiencies. The
Concho Board of Directors believes that the Exchange Offer would allow
shareholders of Concho to exchange their shares for a security in a company
which has a broader market appeal and thus a more liquid investment. In
addition, while Concho has been in the position to pay cash dividends to Concho
Shareholders during the past several years at the rate of $.25 per annum, First
Financial has declared cash dividends per share of $1.20, $.96 and $.82 during
the years ended December 31, 1993, 1992 and 1991, respectively. Shareholders of
Concho would hold shares in a larger banking organization which would tend to
lessen the risk that local market factors in San Angelo would affect the value
of their investment. In addition, the resources of a larger banking organization
would tend to benefit Concho Shareholders as a result of its ability to compete
in the larger marketplace.

  The Concho Board of Directors also believes that, if the exchange is
consummated, its subsidiary, Southwest Bank, will continue to retain its
community bank character even though it will be a subsidiary of a substantially
larger bank holding company. First Financial has grown through acquisition of
community banks, and its acquisition strategy is to allow these independent
community banks to continue to operate as such even though they are part of a
larger holding company. In this regard, it is anticipated that the existing
Board of Directors of Southwest Bank would remain essentially the same and that
the officers and staff would continue to be employed and to manage Southwest
Bank. This should enable the continuation of local control, decision making and
a presence in the community which Southwest Bank serves.

  Finally, in addition to the strategic location of Southwest Bank in the San
Angelo market being a major contribution to First Financial, Southwest Bank's
subsidiary, SWB Investment Company, would be provided with an attractive
opportunity to expand its business to the customer base of First Financial and
its other subsidiary banks. This should provide an attractive growth opportunity
for Concho Shareholders.

THE EXCHANGE RATE

   First Financial will issue and exchange 1.15 shares of First Financial Common
Stock for each share of Concho Common Stock tendered by the Concho Shareholders
who accept the Exchange Offer during the time period the Exchange Offer is in
effect; provided, however, that if First Financial, prior to the consummation of
the proposed Exchange Offer, shall issue any additional shares of First
Financial Common Stock pursuant to any stock dividend or stock split approved by
the Board of Directors of First Financial, the Exchange Rate shall be
appropriately adjusted to reflect such stock dividend or split; and further
provided, that the Exchange Rate shall be adjusted if, as of December 31, 1993,
the Book Value of Concho Common Stock (as defined below) shall be less than
$31.25 or if the Market Value of First Financial Common Stock (as defined below)
shall be less than $40.00 per share as of the date which is ten (10) days prior
to the later of (i) the date First Financial receives written notice that the
Board of Governors of the Federal Reserve System has given final

                                       17
<PAGE>

approval of the application filed by First Financial to acquire all of the
Concho Common Stock or (ii) the date upon which the Registration Statement of
which this Prospectus is a part becomes effective.

  If, as of the date specified above, the Market Value of First Financial Stock
shall be less than $40.00 per share, then the Exchange Rate shall be adjusted by
multiplying the Exchange Rate by a fraction, the numerator of which is $40.00
and the denominator of which is the Market Value of First Financial Common
Stock. If, as of December 31, 1993, the Book Value of Concho Common Stock shall
be less than $31.25 per share, then the Exchange Rate shall be adjusted by
multiplying the Exchange Rate by a fraction, the denominator of which is $31.25
and the numerator of which is the Book Value of Concho Common Stock. If, as of
December 31, 1993, the Book Value of Concho Common Stock is less than $31.25 and
                                                                             ---
if, as of the date specified above, the Market Value of First Financial Stock
shall be less than $40.00, the Exchange Rate shall be adjusted by multiplying
the Exchange Rate of 1.15 by each of the fractions defined above.

  For purposes hereof, the "MARKET VALUE" of First Financial Common Stock means
the per share closing bid price of the First Financial Common Stock in the
over-the-counter market in accordance with quotations supplied by The Principal
- -- Eppler Guerin & Turner or other authoritative source. For purpose hereof, the
"BOOK VALUE" of Concho Common Stock means the consolidated shareholders' equity
of Concho determined in accordance with generally accepted accounting principles
divided by the number of issued and outstanding shares of Concho Common Stock;
provided, that for purposes of determining the Book Value of Concho Common Stock
as of December 31, 1993, as required above, the number of issued and outstanding
shares of Concho Common Stock shall be deemed to include 564 new shares of
Concho Common Stock that are expected to be issued prior to consummation of the
Exchange Offer, and also the consideration paid or to be paid for such shares,
irrespective of whether such shares are, in fact, issued and the consideration
therefor paid prior to December 31, 1993.

  First Financial will not issue any fractional shares of First Financial Common
Stock.  Concho Shareholders who would otherwise be entitled to receive
fractional shares of First Financial Common Stock will be paid in cash for such
fractional shares based upon the Market Value per share of First Financial
Common Stock as of the date which is ten days prior to the later of (i) the date
First Financial receives written notice that the Board of Governors of the
Federal Reserve System has given final approval of the application filed by
First Financial to acquire all of the Concho Common Stock and (ii) the date upon
which the Registration Statement of which this Prospectus is a part becomes
effective.

THE EXPIRATION DATE

  Unless otherwise extended by First Financial, the Exchange Offer shall
terminate at 5:00 p.m., Texas time on ______________, 1994 (the "Expiration
Date").

CONDITIONS TO CONSUMMATION OF THE EXCHANGE OFFER; TERMINATION

  Consummation of the Exchange Offer is subject to the satisfaction of a number
of conditions, including:

  (1)  the expiration of all mandatory waiting periods and the existence in full
force and effect of all regulatory approvals, filings, registrations and
notifications;

  (2)  the receipt by First Financial of an opinion from its independent
accountants that the transaction contemplated by the Exchange Agreement may be
properly accounted for as a pooling-of-interests, and the receipt by Concho from
its independent accountants and/or tax counsel that the Exchange by the Concho
Shareholders will not be considered a taxable event for federal income tax
purposes;

                                       18
<PAGE>

  (3)  the accuracy of all the respective representations and warranties of
Concho, Southwest Bank and First Financial in the Exchange Agreement as of the
date of consummation of the Exchange Offer (the "Consummation Date");

  (4)  the performance of all of the respective obligations and agreements and
compliance with all covenants and conditions by Concho, Southwest Bank and First
Financial contemplated by the Exchange Agreement prior to or on the Consummation
Date;

  (5)  the absence of any proceeding or litigation by any court, governmental
body or regulatory authority pertaining to the Exchange Offer;

  (6)  the declaration by the Commission that the Registration Statement filed
by First Financial pursuant to the Securities Act covering the shares of First
Financial Common Stock to be issued in the Exchange is effective and that no
stop orders have been granted and that First Financial, Concho and Southwest
Bank shall have complied with all applicable state and federal securities laws
relating to the Exchange Offer;

  (7)  the absence of any material adverse change in the financial conditions of
Concho, Southwest Bank or SWB Investment between July 31, 1993 and the
Consummation Date;

  (8)  receipt by First Financial and Concho of certain legal opinions in form
and substance satisfactory to the respective parties;

  (9)  the valid tender of ninety percent (90%) of the issued and outstanding
shares of Concho Common Stock to First Financial; and

  (10) the written agreement of certain noteholders to consent to the transfer
of certain property by Concho to Southwest Bank, the assumption by Southwest
Bank of certain debt owed by Concho and the release and removal of various
liens, security interests and pledges of common stock of Southwest Bank pursuant
to the terms of the Exchange Agreement.

  The Exchange Agreement and the Exchange Offer may be terminated at any time
prior to the Consummation Date:

  (a) by mutual written consent of First Financial and Concho;

  (b) by First Financial if there is a breach of a representation or warranty
      made by Concho which constitutes a material adverse change from that
      represented in the Exchange Agreement or if any of the conditions to
      closing are not satisfied or waived by First Financial;

  (c) by Concho if there is a breach of a representation or warranty made by
      First Financial which constitutes a material adverse change from that
      represented in the Exchange Agreement or if any of the conditions to
      closing are not satisfied or waived by Concho;

  (d) by First Financial or Concho if the Exchange Offer shall not have
      commenced by April 30, 1994 or such later date agreed to in writing by
      First Financial or Concho; or

  (e) by First Financial or Concho if any court of competent jurisdiction or
      other governmental body shall have issued an order, decree or ruling or
      taken any other action restraining, enjoining or otherwise prohibiting the
      Exchange or the Merger, and such order, decree, ruling or other action
      shall have been final and nonappealable.

                                       19
<PAGE>

  Whether or not the transactions contemplated by the Exchange Agreement are
consummated, each of the parties to the Exchange Agreement shall be responsible
for their respective fees and expenses incident to the negotiation, preparation,
execution and consummation of the transactions contemplated by the Exchange
Agreement, including attorneys' and accountants' fees and expenses.

EXCHANGE OF SHARES AND CERTIFICATES

  A Concho Shareholder's delivery of a properly completed and executed Letter of
Transmittal and Concho Common Stock Certificates, prior to the Expiration Date,
to the Exchange Agent at the address provided herein shall be deemed to
constitute an acceptance of the Exchange Offer described in the Prospectus as to
the number of shares registered on the Concho Common Stock Certificates
surrendered.

  Except as otherwise provided below, all signatures on a Letter of Transmittal
must be guaranteed by a firm which is a member of a registered national
securities exchange or the National Association of Securities Dealers, Inc., or
by a commercial bank or trust company having an office or correspondent in the
United States (an "Eligible Institution").  Signatures on a Letter of
Transmittal need not be guaranteed (a) if the Letter of Transmittal is signed by
the registered holder of the shares of Concho Common Stock tendered therewith
and such holder has not completed the box entitled "Special Exchange
Instructions" on the Letter of Transmittal or (b) if such shares of Concho
Common Stock are tendered for the account of an Eligible Institution.  See
Instructions 1 and 3 of the Letter of Transmittal.

  THE METHOD OF DELIVERY OF CONCHO COMMON STOCK CERTIFICATES AND THE LETTER OF
TRANSMITTAL AND ALL OTHER REQUIRED DOCUMENTS TO THE EXCHANGE AGENT IS AT THE
ELECTION AND RISK OF THE CONCHO SHAREHOLDERS. INSTEAD OF DELIVERY BY MAIL, IT IS
RECOMMENDED THAT CONCHO SHAREHOLDERS USE AN OVERNIGHT OR HAND DELIVERY SERVICE. 
IN ALL CASES, SUFFICIENT TIME SHOULD BE ALLOWED TO ASSURE TIMELY DELIVERY. 
CONCHO COMMON STOCK CERTIFICATES AND LETTERS OF TRANSMITTAL SHOULD BE SENT TO
THE EXCHANGE AGENT, WHICH IS THE TRUST DEPARTMENT OF FIRST NATIONAL BANK OF
ABILENE.

  If any First Financial Common Stock Certificate is to be issued in a name
other than that in which the Concho Common Stock Certificate surrendered for
exchange is registered, the certificate so surrendered must be properly endorsed
or otherwise be in proper form for transfer, and the person requesting such
exchange must pay to First Financial or the Exchange Agent any applicable
transfer or other taxes required by reason of the issuance of the certificate.
Any beneficial holder whose shares of Concho Common Stock are registered in the
name of his or her broker, dealer, commercial bank, trust company or other
nominee and who wishes to tender should contact such registered holder promptly
and instruct such registered holder to tender on his or her own behalf.  If such
beneficial holder wishes to tender on his or her own behalf, such beneficial
holder must, prior to completing and executing the Letter of Transmittal and
delivering the Concho Common Stock Certificates, either make appropriate
arrangements to register ownership of the Concho Common Stock to be tendered in
such holder's name or obtain a properly completed stock power from the
registered holder.

  If the Letter of Transmittal is signed by a person other than the registered
holder of any Concho Common Stock listed therein, the Concho Common Stock
Certificates reflecting ownership of Concho Common Stock must be endorsed or
accompanied by appropriate stock powers which authorize such person to tender
the Concho Common Stock on behalf of the registered holder, in either case
signed as the name of the registered holder or holders appears on the Concho
Common Stock Certificates.

  If the Letter of Transmittal or any Concho Common Stock Certificates or stock
powers are signed by trustees, executors, administrators, guardians,
attorneys-in-fact, officers of a corporation or others acting in a fiduciary or
representative capacity, such persons should indicate when signing and, unless
waived by First Financial, evidence satisfactory to First Financial of their
authority to so act must be submitted with the Letter of Transmittal.

                                       20
<PAGE>

  Upon expiration of the Exchange Offer and satisfaction of certain conditions
set forth in the Exchange Agreement, promptly after First Financial receives
written notice from the Exchange Agent indicating that at least ninety percent
(90%) of the outstanding shares of Concho Common Stock have been validly
tendered, each outstanding share of Concho Common Stock tendered to First
Financial will be exchanged for shares of First Financial Common Stock at the
Exchange Rate calculated as described under the caption "-- The Exchange Rate,"
and First Financial Common Stock Certificates reflecting the Exchange shall be
delivered to the Concho Shareholders by registered mail.

  All questions as to the validity, form, eligibility (including time of
receipt), acceptance and withdrawal of the tendered shares of Concho Common
Stock will be determined by First Financial in its sole discretion, which
determination will be final and binding. First Financial reserves the absolute
right to reject any and all shares of Concho Common Stock not properly tendered
or any shares of Concho Common Stock First Financial's acceptance of which
would, in the opinion of counsel for First Financial, be unlawful.  First
Financial reserves the absolute right to waive any irregularities or conditions
of tenders as to particular shares of Concho Common Stock.  Unless waived, any
defects or irregularities in connection with tenders of shares of Concho Common
Stock must be cured within such time as First Financial shall determine. 
Neither First Financial nor the Exchange Agent nor any other person shall be
under any duty to give notification of defects or irregularities with respect to
tenders of shares of Concho Common Stock nor shall any of them incur any
liability for failure to give such notification.  Tenders of shares of Concho
Common Stock will not be deemed to have been made until such irregularities have
been cured or waived.  Any Concho Common Stock Certificates received by the
Exchange Agent that are not properly tendered and as to which the defects or
irregularities have not been cured or waived will be returned without cost by
the Exchange Agent to the tendering holder of such Concho Common Stock
Certificates unless otherwise provided in the Letter of Transmittal, as soon as
practicable following the Expiration Date.

GUARANTEED DELIVERY PROCEDURES

  Concho Shareholders who wish to tender their shares of Concho Common Stock and
(i) whose Concho Common Stock Certificates are not immediately available, or
(ii) who cannot deliver their Concho Common Stock Certificates, the Letter of
Transmittal or any other required documents to the Exchange Agent prior to the
Expiration Date, may effect a tender if:

  (1)  the tender is made through an Eligible Institution;

  (2)  prior to the Expiration Date, the Exchange Agent receives from such
Eligible Institution a properly completed and duly executed Notice of Guaranteed
Delivery (by facsimile transmission, mail or hand delivery) setting forth the
name and address of the holder of Concho Common Stock, the certificate number or
numbers of such Concho Common Stock and the amount of Concho Common Stock
tendered, stating that the tender is being made thereby, and guaranteeing that,
within five (5) business days after the Expiration Date, the Letter of
Transmittal, together with the Concho Common Stock Certificates registering the
Concho Common Stock to be tendered in proper form for transfer and any other
documents required by the Letter of Transmittal, will be deposited by the
Eligible Institution with the Exchange Agent; and

  (3)  such properly completed and executed Letter of Transmittal, together with
the certificates representing all tendered Concho Common Stock in proper form
for transfer and all other documents required by the Letter of Transmittal are
received by the Exchange Agent within five (5) business days after the
Expiration Date.

FRACTIONAL SHARES

  No fractional shares of First Financial Common Stock will be exchanged for
shares of Concho Common Stock.  In lieu thereof, each Concho Shareholder having
a fractional interest resulting from the exchange of Concho Common Stock for
First Financial Common Stock will be paid by First Financial an amount in cash

                                       21
<PAGE>

for such fractional share based upon the Market Value (as defined) per share of
First Financial Common Stock as of the date which is ten days prior to the later
of (i) the date First Financial receives written notice that the Board of
Governors of the Federal Reserve System has given final approval of the
application filed by First Financial to acquire all of the Concho Common Stock
and (ii) the date upon which the Registration Statement of which this Prospectus
is a part becomes effective. Any cash payment to which a Concho Shareholder may
be entitled will be included with such Concho Shareholder's First Financial
Common Stock Certificates when such certificates are mailed to the Concho
Shareholder.

NO WITHDRAWAL RIGHTS

  Tenders of shares of Concho Common Stock pursuant to the Exchange Offer are
irrevocable, and once such shares are tendered, they may not be withdrawn.

REGULATORY APPROVALS REQUIRED

  The Board of Governors of the Federal Reserve System (the "Federal Reserve
Board") must approve First Financial's acquisition of Concho and Southwest Bank
under Section 3 of the Bank Holding Company Act of 1956, as amended. The Federal
Reserve Board has approved the acquisition.

FEDERAL INCOME TAX CONSEQUENCES

  The following is a summary of certain material U.S. Federal income tax
consequences of the Exchange, including certain consequences to holders of
Concho Common Stock who are citizens or residents of the United States and who
hold their shares as capital assets.  It does not discuss all tax consequences
that may be relevant to the Concho Shareholders subject to special Federal
income tax treatment (such as insurance companies, dealers in securities,
certain retirement plans, financial institutions, tax exempt organizations or
foreign persons), or to Concho Shareholders who acquired their shares of Concho
Common Stock pursuant to the exercise of employee stock options or otherwise as
compensation.  The summary does not address the state, local or foreign tax
consequences of the Exchange Offer, if any.

  Concho has received an opinion from its independent public accountants,
Armstrong, Backus & Co., L.L.P., with respect to certain Federal income tax
consequences of the Exchange Offer. A copy of their opinion, which is subject to
certain qualifications and assumptions, is attached hereto as Annex A, and the
following summary of their opinion is qualified in its entirety by reference
thereto. Subject to the qualifications and assumptions set forth in their
opinion, Armstrong, Backus & Co., L.L.P. are of the opinion that, for Federal
income tax purposes:

  1. The Exchange and Merger will be treated as a reorganization within the
     meaning of Section 368(a) of the Internal Revenue Code (the "Code"), and
     First Financial, Concho and First Financial Bankshares of Delaware, Inc.
     each will be a party to the reorganization within the meaning of Section
     368(b) of the Code.

  2. No gain or loss will be recognized by the Concho Shareholders upon receipt
     of First Financial Common Stock in exchange for their Concho Common Stock,
     except for any gain or loss recognized with respect to Concho Shareholders
     who receive cash in lieu of fractional share interests in First Financial
     Common Stock or pursuant to the exercise of statutory dissenter rights.

  3. The aggregate Federal income tax basis of the shares of First Financial
     Common Stock received by the Concho Shareholders in exchange for their
     shares of Concho Common Stock will be the same as the aggregate adjusted
     tax basis of their Concho Common Stock exchanged therefor, less the tax
     basis, if any, allocated to fractional share interests.

                                       22
<PAGE>

  4. The holding period of the First Financial Common Stock received by the
     Concho Shareholders in exchange for their shares of Concho Common Stock in
     the hands of the Concho Shareholders will include the holding period of
     their Concho Common Stock exchanged therefor.

  A Concho Shareholder who receives cash in lieu of a fractional share interest
in First Financial Common Stock will be treated as having received the cash in
redemption of the fractional share interest.  The receipt of cash in lieu of a
fractional share interest should generally result in capital gain or loss to the
holder equal to the difference between the amount of cash received and the
portion of the holder's Federal income tax basis in the Concho Common Stock
allocable to the fractional share interest.  Such capital gain or loss will be
long-term capital gain or loss if the holder's holding period for the First
Financial Common Stock received, determined as set forth above, is longer than
one year.

  A Concho Shareholder who dissents from the Merger and receives cash in
exchange for shares of Concho Common Stock will recognize capital gain or loss
equal to the difference between the amount of cash received and the holder's
Federal income tax basis in the shares. Such capital gain or loss will be
long-term capital gain or loss if the holder has held the shares for more than
one year as of the effective time of the merger.

  THE INCOME TAX DISCUSSION SET FORTH ABOVE IS INCLUDED FOR GENERAL INFORMATION
ONLY AND IS BASED ON THE INTERNAL REVENUE CODE (AND AUTHORITIES THEREUNDER) AS
IN EFFECT ON THE DATE OF THIS PROSPECTUS, WITHOUT CONSIDERATION OF THE
PARTICULAR FACTS OR CIRCUMSTANCES OF ANY SHAREHOLDER.  CONCHO SHAREHOLDERS ARE
URGED TO CONSULT WITH THEIR OWN TAX ADVISORS WITH RESPECT TO THE FEDERAL INCOME
TAX CONSEQUENCES OF THE EXCHANGE IN THEIR PARTICULAR SITUATIONS, AS WELL AS
CONSEQUENCES UNDER ANY APPLICABLE STATE, LOCAL OR FOREIGN TAX LAWS.

EXCHANGE AGENT

  The Trust Department of First National Bank of Abilene has been appointed as
the Exchange Agent for the Exchange.  Questions and requests for additional
copies of this Prospectus should be directed to the Exchange Agent addressed as
follows:

By mail, overnight, courier or hand delivery:  Trust Department
                                               First National Bank of Abilene
                                               Third Floor
                                               400 Pine Street
                                               Abilene, Texas  79601

By facsimile transmission: (915) 675-7342

For confirmation by telephone: (915) 675-7100

RESALE BY CONCHO AFFILIATES

  The shares of First Financial Common Stock issuable to Concho Shareholders
upon consummation of the Exchange Offer have been registered under the
Securities Act, but such registration does not cover the resales by affiliates
of Concho ("Concho Affiliates").  First Financial Common Stock received and
beneficially owned by those Concho Shareholders who are deemed to be Concho
Affiliates may be resold without registration as provided for by Rule 145 under
the Securities Act, or as otherwise permitted.  The term Concho Affiliate is
defined to include any person who, directly or indirectly, controls, or is
controlled by, or is under common control with Concho at or during the time
period covered by the Exchange Agreement.  Each Concho Affiliate who desires to
resell the First Financial Common Stock must sell such First Financial Common
Stock either

                                       23
<PAGE>

(i) pursuant to an effective registration statement under the Securities Act;
(ii) in accordance with the applicable provisions of Rule 145 under the
Securities Act; or (iii) in a transaction which, in the opinion of counsel for
the Concho Affiliate or as described in a "no-action" or interpretive letter
from the Commission, in each case reasonably satisfactory in form and substance
to First Financial, is exempt from the registration requirements of the
Securities Act.  Rule 145(d) requires that persons deemed to be Concho
Affiliates resell their First Financial Common Stock pursuant to certain of the
requirements of Rule 144 under the Securities Act if such First Financial Common
Stock is sold within the first two (2) years after the receipt thereof.  After
two (2) years if such person is not an affiliate of First Financial and First
Financial is current in the filing of its periodic securities law reports, a
former Concho Affiliate may freely resell the First Financial Common Stock
received in the Exchange Offer without limitation.  After three (3) years from
the issuance of the First Financial Common Stock, if such person is not an
affiliate of First Financial at the time of sale and has not been so for at
least three (3) months prior to such sale, such person may freely resell such
First Financial Common Stock, without limitation, regardless of the status of
First Financial's periodic securities law reports.

  Each Concho Affiliate will deliver to First Financial a written agreement to
the effect that no sale will be made of any shares of First Financial Common
Stock received in the Exchange Offer by a Concho Affiliate except (i) in
accordance with the Securities Act; and (ii) if, as it expects to do, First
Financial utilizes pooling-of-interests accounting in accounting for the
Exchange Offer, until such time as First Financial shall publish the financial
results of at least thirty (30) days of post-Exchange operations of First
Financial.  The First Financial Common Stock Certificates issued to Concho
Affiliates in the Exchange Offer may contain an appropriate restrictive legend,
and appropriate stop transfer orders may be given to the Exchange Agent for such
certificates.

ANTICIPATED MERGER AND DISSENTING SHAREHOLDERS' RIGHTS

  First Financial anticipates that upon consummation of the Exchange Offer,
First Financial will contribute the shares of Concho Common Stock acquired in
the Exchange Offer to First Financial Bankshares of Delaware, Inc., a
wholly-owned subsidiary of First Financial ("FFB Delaware"), and Concho will
then be merged (the "Merger") with and into FFB Delaware pursuant to Article
5.16 of the Texas Business Corporation Act (the "TBCA").  In the event that not
all of the outstanding Concho Common Stock is tendered for exchange in the
Exchange Offer, within ten (10) days after the effective date of the Merger, FFB
Delaware shall provide notice of the Merger to the Concho Shareholders who did
not elect to participate in the Exchange Offer.  The consideration to be issued
in the Merger shall be the same as that in the Exchange Offer.  A Concho
Shareholder who elects to dissent from the Merger (a "Dissenting Shareholder")
must follow specific procedures in order to perfect its dissenter's rights.

  Within twenty (20) days of mailing of the notice of the Merger, the Dissenting
Shareholders must make a written demand on FFB Delaware for the fair value of
their shares of Concho Common Stock.  The fair value of such shares shall be the
value thereof as of the day before the effective date of the Merger, excluding
any appreciation or depreciation in anticipation of the Merger.  The Dissenting
Shareholders must include in their demands information as to the number and
estimated fair value of shares owned by such shareholders. Any Dissenting
Shareholder who fails to make a demand within the twenty (20) day period shall
be bound by the terms and the consideration provided in the Merger.

  Within ten (10) days of receipt of a Dissenting Shareholder's written demand,
FFB Delaware shall either accept such demand or reject it and make a
counter-offer as to the fair value of the Concho Common Stock. Upon the
agreement between FFB Delaware and the Dissenting Shareholder as to the fair
value of the Concho Common Stock, FFB Delaware shall pay the agreed fair value
of the shares of Concho Common Stock owned by such Dissenting Shareholder in
exchange for endorsed Concho Common Stock Certificates representing such shares.
The Dissenting Shareholder shall, at that time, cease to have any interest in
FFB Delaware.  If a Dissenting Shareholder is unable to reach an agreement with
FFB Delaware as to the fair value of the Concho Common Stock, the specific
remedies provided in Article 5.16 of the TBCA for determination of fair

                                       24
<PAGE>

value by a court of law shall be available to such shareholder.  Article 5.16 of
the TBCA is attached to this Prospectus as Annex B.

ACCOUNTING TREATMENT

  First Financial expects to account for the Exchange as a pooling-of-interests
and expects to receive the written opinion of Arthur Andersen & Co. that it is
appropriate to do so.


                       CERTAIN REGULATORY CONSIDERATIONS

GENERAL

  Bank holding companies and banks are extensively regulated under both federal
and state law.  To the extent that the following information describes statutory
and regulatory provisions, it is qualified in its entirety by reference to the
particular statutory and regulatory provisions.  A change in applicable law or
regulation may have a material effect on the business of First Financial.

  As a bank holding company, First Financial is subject to regulation under the
BHCA and its examination and reporting requirements.  Under the BHCA, bank
holding companies may not (subject to certain limited exceptions) directly or
indirectly acquire the ownership or control of more than five percent (5%) of
any class of voting shares or substantially all of the assets of any company,
including a bank, without the prior written approval of the Federal Reserve
Board.  In addition, bank holding companies are generally prohibited under the
BHCA from engaging in nonbanking activities, subject to certain exceptions.

PAYMENT OF DIVIDENDS

  First Financial is a legal entity separate and distinct from its banking and
other subsidiaries.  Most of First Financial's revenues result from dividends
paid to it by its bank subsidiaries.  There are statutory and regulatory
requirements applicable to the payment of dividends by subsidiary banks as well
as by First Financial to its shareholders.

  Each state bank subsidiary that is a member of the Federal Reserve System and
each national banking association is required by federal law to obtain the prior
approval of the Federal Reserve Board or the Office of the Comptroller of the
Currency (the "OCC"), as the case may be, for the declaration and payment of
dividends if the total of all dividends declared by the board of directors of
such bank in any year will exceed the total of (i) such bank's net profits (as
defined and interpreted by regulation) for that year plus (ii) the retained net
profits (as defined and interpreted by regulation) for the preceding two (2)
years, less any required transfers to surplus.  In addition, these banks may
only pay dividends to the extent that retained net profits (including the
portion transferred to surplus) exceed bad debts (as defined by regulation). 
Under the Texas Banking Code of 1943, as amended, before any dividend may be
paid to First Financial by an affiliated state bank, the state bank must
transfer to "certified surplus" an amount which is not less than ten percent
(10%) of the net profits of such bank earned since the last dividend was
declared; provided, however, that a transfer is not required to certified
surplus of a sum which would increase the certified surplus to more than the
capital of the bank.

  Under the foregoing dividend restrictions, in 1993 the First Financial Banks,
without obtaining governmental approvals, could have declared aggregate
dividends of approximately $18.5 million from retained net profits.  During
1993, the First Financial Banks paid $8.9 million in dividends.

  The payment of dividends by First Financial and its subsidiaries is also
affected by various regulatory requirements and policies, such as the
requirement to maintain adequate capital above regulatory guidelines. 

                                       25
<PAGE>

In addition, if, in the opinion of the applicable regulatory authority, a bank
under its jurisdiction is engaged in or is about to engage in an unsafe or
unsound practice (which, depending on the financial condition of the bank, could
include the payment of dividends), such authority may require, after notice and
hearing, that such bank cease and desist from such practice.  The Federal
Reserve Board and the OCC have each indicated that paying dividends that deplete
a bank's capital base to an inadequate level would be an unsafe and unsound
banking practice.  The Federal Reserve Board, the OCC and the Federal Deposit
Insurance Corporation (the "FDIC") have issued policy statements which provide
that bank holding companies and insured banks should generally only pay
dividends out of current operating earnings.

CERTAIN TRANSACTIONS BY FIRST FINANCIAL WITH ITS AFFILIATES

  There are also various legal restrictions on the extent to which First
Financial can borrow or otherwise obtain credit from, or engage in certain other
transactions with, its depository subsidiaries.  The "covered transactions" that
an insured depository institution and its subsidiaries are permitted to engage
in with their nondepository affiliates are limited to the following amounts: 
(i) in the case of any one such affiliate, the aggregate amount of "covered
transactions" of the insured depository institution and its subsidiaries cannot
exceed ten percent (10%) of the capital stock and the surplus of the insured
depository institution; and (ii) in the case of all affiliates, the aggregate
amount of "covered transactions" of the insured depository institution and its
subsidiaries cannot exceed twenty percent (20%) of the capital stock and surplus
of the insured depository institution.  In addition, extensions of credit that
constitute "covered transactions" must be collateralized in prescribed amounts. 
"Covered transactions" are defined by statute to include a loan or extension of
credit to the affiliate, a purchase of securities issued by an affiliate, a
purchase of assets from the affiliate (unless otherwise exempted by the Federal
Reserve Board), the acceptance of securities issued by the affiliate as
collateral for a loan and the issuance of a guarantee, acceptance, or letter of
credit for the benefit of an affiliate.  Further, a bank holding company and its
subsidiaries are prohibited from engaging in certain tie-in arrangements in
connection with any extension of credit, lease or sale of property or furnishing
of services.

CAPITAL

  The Federal Reserve Board has adopted risk based capital guidelines for bank
holding companies.  The minimum guidelines for the ratio of total capital
("Total Capital") to risk weighted assets (including certain off-balance-sheet
activities, such as standby letters of credit) is eight percent (8%).  From
year-end 1991 until year-end 1992, the minimum ratio was 7.25%.  At least half
of the Total Capital is to be composed of common shareholders' equity, minority
interests in the equity accounts of consolidated subsidiaries and a limited
amount of perpetual preferred stock, less goodwill ("Tier 1 Capital").  The
remainder may consist of subordinated debt, other preferred stock and a limited
amount of loan loss reserves.

  In addition, the Federal Reserve Board has established minimum leverage ratio
guidelines for bank holding companies.  These guidelines provide for a minimum
Tier 1 Capital leverage ratio (Tier 1 Capital to total assets, less goodwill) of
three percent (3%) for bank holding companies that meet certain specified
criteria, including having the highest regulatory rating.  All other bank
holding companies will generally be required to maintain a minimum Tier 1
Capital leverage ratio of three percent (3%) plus an additional cushion of 100
to 200 basis points.  The Federal Reserve Board has not advised First Financial
of any specific minimum Tier 1 Capital leverage ratio applicable to it.  The
guidelines also provide that bank holding companies experiencing internal growth
or making acquisitions will be expected to maintain strong capital positions
substantially above the minimum supervisory levels without significant reliance
on intangible assets (e.g., goodwill, core deposit intangibles and purchased
mortgage servicing rights).  Furthermore, the guidelines indicate that the
Federal Reserve Board has indicated that it will continue to consider a
"tangible Tier 1 Capital leverage ratio"  (deducting all intangibles) in
evaluating proposals for expansion or new activities. As of September 30, 1993,
the "tangible Tier 1 Capital leverage ratios" of First Financial, Concho and pro

                                       26
<PAGE>

forma (giving effect to the Exchange and the Merger) for First Financial and
Concho combined were 9.63%, 6.89% and 9.38% respectively.

  The following tables set forth the Tier 1 Capital to risk-weighted assets
ratios, the total capital to risk-weighted assets ratios and the Tier 1 leverage
ratios for First Financial and Concho individually and on a pro forma combined
basis as of certain dates and periods.  Such pro forma combined data is derived
from the financial information of First Financial and Concho at September 30 or
December 31 for each of the periods presented below and gives effect to the
Exchange and the Merger.

                  Tier 1 Capital to Risk-Weighted Assets Ratio
                    (in each case calculated pursuant to the
                         risk-based capital guidelines)
<TABLE>
<CAPTION>
 
                                                     Pro Forma
As of:                 First Financial     Concho    Combined
- ------                 ----------------  ----------  ---------
<S>                    <C>               <C>         <C> 
September 30, 1993...      17.14%          12.17%      16.69%
December 31, 1992....      17.22           13.39       16.90
December 31, 1991....      15.73           11.64       15.38
</TABLE>

                  Total Capital To Risk-Weighted Assets Ratio
                    (in each case calculated pursuant to the
                         risk-based capital guidelines)
<TABLE>
<CAPTION>
 
                                                     Pro Forma
As of:                 First Financial     Concho    Combined
- ------                 ----------------  ----------  ---------
<S>                    <C>               <C>         <C>  
September 30, 1993...      18.39%          13.35%      17.93%
December 31, 1992....      18.72           14.75       18.38
December 31, 1991....      17.23           12.90       16.86
</TABLE>

                             Tier 1 Leverage Ratio
<TABLE>
<CAPTION>
 
 
                                                     Pro Forma
As of:                 First Financial     Concho    Combined
- ------                 ----------------  ----------  ---------
<S>                    <C>               <C>         <C> 
September 30, 1993...      9.63%           6.89%       9.38%
December 31, 1992....      9.59            6.89        9.28
December 31, 1991....      8.69            6.30        8.48
</TABLE>

  In addition to the Federal Reserve Board capital standards, Texas-chartered
banks must comply with the capital requirements imposed by the Texas Banking
Department. Although neither the Texas Banking Code nor the regulations
promulgated thereunder specify any minimum capital-to-assets ratio that must be
maintained by a Texas-chartered bank, the Texas Banking Department has a policy
that generally requires Texas-chartered banks to maintain a minimum 6% ratio of
stockholders equity (stated capital, surplus capital, surplus and undivided
profits or retained earnings) to total assets. As of September 30, 1993, all
Texas-chartered banks owned by First Financial, as well as Concho, exceeded the
minimum ratio.

                                       27
<PAGE>

  Failure to meet capital guidelines could subject an insured bank to a variety
of enforcement remedies, including the termination of deposit insurance by the
FDIC and a prohibition on the taking of brokered deposits.  See "FDICIA" below.

  Bank regulators continue to indicate their desire to raise capital
requirements applicable to banking organizations beyond their current levels. 
However, the management of First Financial is unable to predict whether and when
higher capital requirements might be imposed and, if they are imposed, at what
levels and on what schedule.

FIRST FINANCIAL SUPPORT OF THE FIRST FINANCIAL BANKS

  Under Federal Reserve Board policy, First Financial is expected to act as a
source of financial strength to each of its subsidiary banks and to commit
resources to support each of such subsidiaries.  This support may be required at
times when, absent such Federal Reserve Board policy, First Financial would not
otherwise be required to provide it.

  Under the Financial Institutions Reform, Recovery, and Enforcement Act of 1989
("FIRREA"), a depository institution insured by the FDIC can be held liable for
any loss incurred by, or reasonably expected to be incurred by, the FDIC after
August 9, 1989 in connection with (i) the default of a commonly controlled
FDIC-insured depository institution, or (ii) any assistance provided by the FDIC
to any commonly controlled FDIC-insured depository institution "in danger of
default."  "Default" is defined generally as the appointment of a conservator or
receiver and "in danger of default" is defined generally as the existence of
certain conditions indicating that a default is likely to occur in the absence
of regulatory assistance.

  Under the National Bank Act, if the capital stock of a national bank is
impaired by losses or otherwise, the OCC is authorized to require payment of the
deficiency by assessment upon the bank's shareholders, pro rata, and to the
extent necessary, if any such assessment is not paid by any shareholder after
three (3) months' notice, to sell the stock of such shareholder to make good the
deficiency.

FDIC INSURANCE ASSESSMENTS

  The First Financial Banks are subject to FDIC deposit insurance assessments. 
The FDIC set an assessment rate for the Bank Insurance Fund ("BIF") of 0.195
percent for periods prior to June 30, 1991, and an assessment rate of 0.23
percent effective on June 30, 1991.  On September 15, 1992 the FDIC approved the
implementation of a transition risk-based deposit premium assessment system
under which each depositary institution will be placed in one of nine assessment
categories based on certain capital and supervisory measures.  The assessment
rates under the new system will range from 0.23 percent to 0.31 percent
depending upon the assessment category into which the insured institution is
placed.  The new assessment system became effective January 1, 1993.  The First
Financial Banks were assessed a weighted average rate of 0.115 percent for the
first six-month assessment period.  It is possible that BIF assessments will be
further increased and it is possible that there may be special additional
assessments in the future.  A significant increase in the assessment rate or a
special additional assessment could have an adverse impact on First Financial's
results of operations.

FDICIA

  Among other things, the Federal Deposit Insurance Corporation Improvement Act
of 1992 ("FDICIA") requires the federal banking agencies to take "prompt
corrective action" in respect of depository institutions that do not meet
minimum capital requirements.  FDICIA establishes five capital tiers: "well
capitalized," "adequately capitalized," "undercapitalized," "significantly
undercapitalized" and "critically undercapitalized." A depository institution's
capital tier will depend upon where its capital levels are in relation to
various

                                       28
<PAGE>

relevant capital measures, which will include a risk-based capital measure, a
leverage ratio capital measure and certain other factors.

  Regulations establishing the specific capital tiers have been recently
enacted.  Under these regulations, for an institution to be well capitalized it
must have a total risk-based capital ratio of at least ten percent (10%), a Tier
1 risk-based capital ratio of at least six percent (6%), and a Tier 1 leverage
ratio of at least five percent (5%), and not be subject to any specific capital
order or directive.  For an institution to be adequately capitalized it must
have a total risk-based capital ratio of at least eight percent (8%), a Tier 1
risk-based capital ratio of at least four percent (4%), and a leverage ratio of
at least four percent (4%) (in some cases three percent (3%)).  Under these new
regulations, the First Financial Banks would be considered to be well
capitalized as of December 31, 1992.

  FDICIA generally prohibits a depository institution from making any capital
distribution (including payment of a dividend) or paying any management fee to
its holding company if the depository institution would thereafter be
undercapitalized.  Undercapitalized depository institutions are subject to
growth limitations and are required to submit a capital restoration plan.  The
federal banking agencies may not accept a capital plan without determining,
among other things, that the plan is based on realistic assumptions and is
likely to succeed in restoring the depository institution's capital. 
Significantly undercapitalized depository institutions may be subject to a
number of requirements and restrictions, including orders to sell sufficient
voting stock to become adequately capitalized, requirements to reduce the total
assets and cessation of receipt of deposits from correspondent banks. 
Critically undercapitalized institutions are subject to the appointment of a
receiver or conservator.


                  DESCRIPTION OF FIRST FINANCIAL CAPITAL STOCK

  The following description contains a summary of all of the material features
of the capital stock of First Financial but does not purport to be complete and
is subject to and qualified in its entirety by reference to the First Financial
Articles of Incorporation, which are filed as exhibits to documents incorporated
by reference herein and by reference to the applicable provisions of the Texas
Business Corporation Act.  See also "COMPARISON OF SHAREHOLDER RIGHTS" below. 
The following description should be read carefully by the Concho Shareholders.

  First Financial's total authorized capital stock consists of 5,000,000 shares
of First Financial Common Stock with a par value of $10.00 per share.  There is
no authorized preferred stock.  As of December 31, 1993, there were issued and
outstanding 3,746,687 shares of First Financial Common Stock.

  The holders of First Financial Common Stock ("First Financial Shareholders")
are entitled to receive such dividends as may from time to time be declared by
the First Financial Board of Directors.  Shareholders are entitled to one vote
per share of First Financial Common Stock on every issue submitted to them as
First Financial Shareholders at a meeting of shareholders or otherwise.  In the
event of liquidation, First Financial Shareholders are entitled to share
ratably, after satisfaction in full of the prior rights of creditors, in all
assets of First Financial available for distribution to First Financial
Shareholders.  First Financial Shareholders do not have preemptive or cumulative
voting rights.  All shares of First Financial Common Stock now issued and
outstanding are fully paid and nonassessable.

                                       29
<PAGE>

                       COMPARISON OF SHAREHOLDER RIGHTS

  In the event that the Exchange is consummated, Concho Shareholders whose
shares of Concho Common Stock are tendered in the Exchange Offer will become
First Financial Shareholders.  Their rights will be governed by Texas law, the
First Financial Articles of Incorporation (the "First Financial Charter") and
the Bylaws of First Financial (the "First Financial Bylaws").

  Certain differences between the rights of Concho Shareholders and First
Financial Shareholders are set forth below.  As both Concho and First Financial
are organized under the laws of Texas, these differences primarily arise from
various provisions of the First Financial Charter, the First Financial Bylaws,
the Concho Articles of Incorporation (the "Concho Charter") and the Bylaws of
Concho (the "Concho Bylaws").  This summary contains a description of the
material differences in shareholder rights, but is not meant to be relied upon
as an exhaustive list or detailed description of the provisions discussed herein
and is qualified in its entirety by reference to the TBCA, the First Financial
Charter, the First Financial Bylaws, the Concho Charter and the Concho Bylaws.

BOARD OF DIRECTORS

  The First Financial Bylaws provide that the number of directors constituting
the First Financial Board of Directors shall be not less than three and not more
than thirty.  Persons eligible for election to the First Financial Board of
Directors are First Financial Shareholders who, at the date of the annual
meeting of shareholders at which the Board is elected, (i) have not attained the
age of 72 years, or (ii) have not attained the age of 75 years and own one
percent (1%) or more of the outstanding shares of First Financial Common Stock. 
Any director of First Financial may be removed, with or without cause, by the
holders of a majority of the shares outstanding.

  The Concho Bylaws provide that the number of directors constituting the Concho
Board of Directors shall be four, but the number of Directors may be increased
or decreased (provided such decrease does not shorten the time of service of any
incumbent director) from time to time by amendment to the Concho Bylaws;
provided, however, that the number of directors shall never be less than one. 
At any meeting of Concho Shareholders called expressly for the purpose of
removing a director, any director or the entire Concho Board of Directors may be
removed, with or without cause, by a vote of the holders of a majority of the
shares then entitled to vote at any election of directors.


INDEMNIFICATION AND LIMITATION OF LIABILITY OF DIRECTORS AND OFFICERS

  The First Financial Charter provides that, to the fullest extent permitted by
applicable law, no First Financial director shall be liable to First Financial
or the First Financial Shareholders for monetary damages for or with respect to
any acts or omissions in his or her capacity as a director, except in the case
of liability for (i) a breach of a duty of loyalty to First Financial or its
shareholders, (ii) an act or omission not in good faith or that involves
intentional misconduct or a knowing violation of the law, (iii) a transaction
from which a director received an improper benefit, (iv) an act or omission for
which the liability of a director is expressly provided by statute, or (v) an
act related to an unlawful stock repurchase or payment of a dividend.

  The First Financial Charter also provides that each director, officer,
employee and agent of First Financial shall be indemnified for all expenses
incurred in connection with any action, suit, proceeding or claim to which he or
she is named a party or otherwise by virtue of holding such position; provided,
however, that no indemnification of employees or agents (other than directors or
officers) will be made without express authorization of the Board of Directors. 
The First Financial Charter provides that such indemnification shall be provided
to the fullest extent permitted by applicable law.

                                       30
<PAGE>

  The Concho Bylaws provide that Concho shall indemnify its directors and
officers against expenses actually and necessarily incurred by such person in
connection with the defense of any action, suit, or proceeding, whether civil or
criminal, in which he or she is made a party by reason of being or having been
such director or officer, except in relation to matters as to which he or she
shall be adjudged in such action, suit or proceeding to be liable for negligence
or misconduct in performance of duty.  Neither the Concho Charter nor the Concho
Bylaws contain a limitation of liability provision.

Special Meetings of Shareholders

  The First Financial Bylaws provide that a special meeting of shareholders may
be called by (i) a majority of the Board of Directors, or (ii) by the Chief
Executive Officer joined by at least three members of the Board of Directors, or
(iii) by shareholders holding voting rights of not less than 20% of the stock of
the corporation.

  The Concho Bylaws provide that a special meeting of the shareholders may be
called by the President, and shall be called by the President or Secretary at
the request in writing of a majority of the Board of Directors, or at the
request in writing of shareholders owning not less than 10% of all the shares
entitled to vote at the meetings.

                       INFORMATION ABOUT FIRST FINANCIAL

GENERAL

  First Financial is a Texas corporation and a multi-bank holding company
registered under the Bank Holding Company Act of 1956, as amended (the "BHCA"). 
First Financial owns, through its wholly-owned Delaware subsidiary, First
Financial Bankshares of Delaware, Inc., all of the capital stock of six banks
organized and located in Texas:  First National Bank of Abilene, Abilene, Texas;
Hereford State Bank, Hereford, Texas; First National Bank, Sweetwater, Texas;
Eastland National Bank, Eastland, Texas; The First National Bank in Cleburne,
Cleburne, Texas; and Stephenville Bank and Trust Co., Stephenville, Texas
(collectively, the "First Financial Banks").  As of September 30, 1993, First
Financial and its consolidated subsidiaries had total assets of approximately
$906.8 million, total deposits of approximately $809.1 million, total loans (net
of allowance for loan losses) of approximately $359.1 million and total
shareholders' equity of approximately $88.7 million.

  First Financial operates principally in order to give the First Financial
Banks access to additional management and technical resources which help them to
improve or expand their banking and other services while continuing their local
activity and autonomy.  Each of the First Financial Banks operates under the
day-to-day management of its Board of Directors and officers, with substantial
authority in making decisions concerning its own investments, loan policies,
interest rates and service charges.  First Financial provides assistance to the
First Financial Banks, especially with respect to decisions concerning major
capital expenditures, employee fringe benefits, including pension plans and
group insurance, dividend policies, appointment of officers and directors of
First Financial Banks and compensation.  First Financial provides advice to and
specialized services for the First Financial Banks in such areas as taxation,
lending techniques, investments, purchasing, advertising, public relations,
automation procedures and computer services.  In addition, First Financial
coordinates various transactions among the First Financial Banks, including loan
participations.  First Financial makes the services of the Trust Department of
First National Bank of Abilene available to customers of the other First
Financial Banks, as well as investment and computer services.

  Each First Financial Bank is engaged in the general commercial banking
business consisting of the acceptance of checking, savings and time deposits,
the making of loans, including bank credit card services, transmitting funds and
performing such other banking services as are usual and customary for commercial
banks.

                                       31
<PAGE>

  In addition to First National Bank of Abilene, First National Bank, Sweetwater
and Stephenville Bank and Trust Co. have active trust departments. The trust
departments offer a complete range of services to individuals, associations and
corporations, including the administration of estates, testamentary trusts and
various types of living trusts and agency accounts.  Other sources of revenue
are services for businesses, including administering pension, profit sharing,
and other employee benefit plans, acting as stock transfer agent or stock
registrar, and providing paying agent services.

  Commercial banking in Texas is very competitive.  As of December 31, 1992, the
latest date of compilation by the Federal Reserve Bank in Dallas, Texas, there
were 85 multi-bank holding companies existing or operating in the State of
Texas.  Representing .64% of the market, First Financial was ranked seventh on
the basis of total deposits.  The competition from holding companies is largely
centered in efforts to obtain larger deposits and procure outlets for funds for
available lending.  Success is dependent upon being able to compete in these
areas, as well as in the areas of interest rates paid or charged and scope of
services offered and prices charged therefor.

  In addition to competition from other banks, the First Financial Banks will
also continue to be subject to substantial competition from other financial
institutions, such as savings and loan associations, small loan companies,
credit unions and brokerage firms, all of which are engaged in providing
financial products and services.

  First Financial's principal executive offices are located at 400 Pine Street,
Abilene, Texas 79601, and its telephone number is (915) 675-7155.

  For further information concerning First Financial which is incorporated
herein by reference from certain publicly-filed documents, see "Incorporation by
Reference."

MARKET PRICES OF AND DIVIDENDS PAID ON FIRST FINANCIAL COMMON STOCK

  First Financial Common Stock is traded in the over-the-counter market. Since
November 1, 1993, the First Financial Common Stock has been reported on the
NASDAQ National Market under the trading symbol "FFIN." The following table sets
forth, for the periods indicated, the high and low bid prices and cash dividends
declared per share of First Financial Common Stock.  The information with
respect to price quotations was obtained from The Principal/Eppler, Guerin &
Turner, Inc. of Abilene, Texas, a securities brokerage firm ("Eppler Guerin"),
and have been adjusted to reflect a three for two stock split effective June 1,
1992 and a ten percent (10%) stock dividend paid to First Financial shareholders
in the second quarter of 1993.

<TABLE>
<CAPTION>
 
                                          DIVIDENDS
                            HIGH    LOW    DECLARED
                           ------  ------  --------
<S>                           <C>     <C>     <C> 
1991:
 
      First Quarter..........  $16.00  $15.50     $0.19
      Second Quarter.........   16.50   16.00      0.21
      Third Quarter..........   17.50   16.50      0.21
      Fourth Quarter.........   18.00   17.50      0.21
 
1992:
 
      First Quarter..........   20.00   18.00       .21
      Second Quarter.........   23.00   20.00       .25
      Third Quarter..........   31.00   23.00       .25
      Fourth Quarter.........   35.50   31.00       .25 
 
 
</TABLE>

                                       32
<PAGE>

<TABLE>

<S>                             <C>     <C>        <C> 
1993:
 
      First Quarter..........   37.00   35.50      0.25
      Second Quarter.........   39.00   37.00      0.32
      Third Quarter..........   40.00   39.00      0.32
      Fourth Quarter.........   45.00   40.00      0.32
 
1994:
 
      First Quarter (through                          
      January 6, 1994).......   41.50   41.50        --
</TABLE>

  On December 6, 1993 (the last trading day preceding the execution of the
Exchange Agreement), the last sales price of First Financial Common Stock, as
reported by NASDAQ, was $43.50 per share.  On __________, 1994 (the last
practicable date prior to the mailing of this Prospectus), the last sales price
of First Financial Common Stock, as reported by NASDAQ, was $____________ per
share.

  CONCHO SHAREHOLDERS ARE ADVISED TO OBTAIN CURRENT MARKET QUOTATIONS FOR FIRST
FINANCIAL COMMON STOCK.  NO ASSURANCE CAN BE GIVEN CONCERNING THE MARKET PRICE
OF FIRST FINANCIAL COMMON STOCK BEFORE OR AFTER THE DATE ON WHICH THE EXCHANGE
IS CONSUMMATED.  THE MARKET PRICE OF FIRST FINANCIAL COMMON STOCK WILL FLUCTUATE
BETWEEN THE DATE OF THIS PROSPECTUS AND THE DATE ON WHICH THE EXCHANGE IS
CONSUMMATED AND THEREAFTER.

  The timing and amount of future dividends on First Financial Common Stock will
depend upon earnings, cash requirements, the financial condition of First
Financial and its subsidiaries, applicable government regulations and other
factors deemed relevant by the Board of Directors of First Financial.  [ANY DEBT
INSTRUMENT RESTRICTIONS ON DIVIDENDS?]  As described under "Certain Regulatory
Considerations,"  various state and federal laws limit the ability of the First
Financial Banks to pay dividends to First Financial.

  On December 31, 1993, there were 1,204 holders of record of First Financial
Common Stock.


                            INFORMATION ABOUT CONCHO

GENERAL

  Concho is a one bank holding company formed in 1979 and incorporated in the
State of Texas. Concho owns 99.8% of Southwest Bank. Southwest Bank is chartered
in the State of Texas, began operations in 1975, and its deposits are insured by
the Federal Deposit Insurance Corporation. SWB's wholly owned subsidiary, SWB
Investment, operates as a registered investment advisor.

MARKET AREA

  Southwest Bank conducts business principally in Tom Green County through its
location in San Angelo, Texas. The market area of SWB Investment is also Tom
Green County, with a small amount derived from other area counties.

SERVICES

  Southwest Bank provides a full range of both commercial and consumer banking
services including loans, checking accounts, savings programs, safe deposit
facilities, access to automated teller machines, and credit card programs. The
bank does not offer trust services. SWB Investment offers investment advice to
customers

                                       33
<PAGE>

who may execute trades with the bank through its discount brokerage operation or
through its affiliation with Stephens, Inc. of Little Rock, Arkansas.

COMPETITION

  The business of banking in Concho's market area is highly competitive. In San
Angelo seven other banks operate with eleven locations. Competition is also high
from credit unions, saving and loan associations, investment brokers, insurance
companies, and mortgage companies.

EMPLOYEES

  As of September 30, 1993, Concho and its subsidiaries employed 46 full time
and 12 part time people.

PROPERTIES

  Southwest Bank's only location is in a five story office tower in San Angelo,
Texas. The bank occupies the basement and first and second floors. The third,
fourth, and fifth floors, owned by Concho, are leased to non-affiliated tenants.

MARKET FOR AND DIVIDENDS PAID ON CONCHO COMMON STOCK

  There is no established public trading market for Concho Common Stock.  Concho
Common Stock is not listed on a national securities exchange and is not
authorized for quotation on an interdealer quotation system. As of December 15,
1993, there were 239 holders of record of Concho Common Stock.  Concho has paid
dividends on Concho Common Stock in prior years, but payment of future dividends
is not assured.

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS

  As of December 15, 1993, the management of Concho knew of no person, other
than those listed below, owning beneficially more than 5% of the Concho Common
Stock.

<TABLE>
<CAPTION>
 
                                                                    
                                            Shares of Concho           Percentage of  
                                              Common Stock              Outstanding    
 Name and Address of Beneficial Owner     Beneficially Owned(1)     Concho Common Stock     
- ---------------------------------------  -----------------------   --------------------
<S>                                      <C>                      <C>
Wilbur Carr Brown                                17,830                   8.84%
1974 Overhill Drive
San Angelo, Texas 76904
 
First National Bank of West Texas                16,267                   8.07%
P.O. Box  1241
Lubbock, Texas 79408
 
Jack Drake & Sons                                12,250(2)                6.07%
P. O. Box 60410
San Angelo, Texas 76906
 
H.D. Eakman                                       9,942                  4.93%
1686 La Villa Circle
San Angelo, Texas 76904
 
 
</TABLE>

                                       34
<PAGE>

<TABLE>
<S>                                      <C>                      <C>
O.L. Schuch                                      11,047(3)                5.48%
3714 Vista del Arroyo
San Angelo, Texas 76904
 
John W. West                                     17,876                   8.86%
P. O. Box 1329
San Angelo, Texas 76902
</TABLE>

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

(1) As determined in accordance with Rule 13d-3 promulgated under the Securities
    Exchange Act of 1934, as amended.

(2) 358 shares are in the name of David B. Drake while 11,892 are held by Jack
    Drake & Sons, a partnership 50% owned by David Drake.

(3) 10,333 shares are in the name of O. L. Schuch while 714 shares are held by
    his wife Dorothy Schuch.



SECURITY OWNERSHIP OF MANAGEMENT

  The following table sets forth information as to the shares of Concho Common
Stock beneficially owned by each director and executive officer and for all
directors and executive officers as a group as of December 15, 1993.
<TABLE>
<CAPTION>
 
 
                      Shares of Concho
                        Common Stock                 Percentage of Concho
Name                Beneficially Owned(1)          Common Stock Outstanding 
- ----                ---------------------          ------------------------
<S>                 <C>                            <C>
Michael L. Boyd              845                                *   
David B. Drake            12,250 (2)                        6.07%   
H.D. Eakman                9,942 (3)                        4.93%   
Dan Cravy M.D.             6,368                            3.16%   
Ingram Hartje, III           833                                *   
Joe Mertz                  1,400                                *   
William Pfluger            3,572                            1.77%   
Craig Porter               1,727                                *   
O.L. Schuch               11,047 (4)                        5.48%   
Tim Turner, D.V.M.           232                                *   
David Lupton                 424                                *   
Doug Eakman                  825                                *   
 
All directors and executive
officers as a group:      49,465                           24.53%   

</TABLE>

- --------------------
*   Indicates beneficial ownership is less than one percent.

(1) Each director and executive of Concho has sole voting and investment powers
    with respect to all shares of Concho Common Stock shown as beneficially 
    owned by such director or executive officer except as

                                       35
<PAGE>

    otherwise indicated in the following footnotes.  Beneficial ownership is
    determined in accordance with Rule 13d-3 promulgated under the Securities
    Exchange Act of 1934, as amended.

(2) 358 shares are in the name of David B. Drake while 11,892 are held by Jack
    Drake & Sons, a partnership 50% owned by David Drake.

(3) 7,617 shares are in the name of H. D. Eakman while 2,325 shares are held by
    Pecos Street Pharmacy, an entity owned by Mr. Eakman.

(4) 10,333 shares are in the name of O. L. Schuch while 714 shares are held by
    his wife Dorothy Schuch.

  After giving effect to the First Financial Common Stock to be issued in the
Exchange and the Merger, and based on the number of shares of First Financial
Common Stock outstanding as of December 31, 1993, no director or executive
officer of Concho will beneficially own more than one percent (1%) of the
outstanding First Financial Common Stock immediately after the Exchange and the
Merger.

  There are no commitments at this time for the issuance of shares to any
officer, director or other major stockholders.

                                       36
<PAGE>

                 SELECTED CONSOLIDATED FINANCIAL DATA OF CONCHO


  The following tables present selected historical consolidated financial data
of Concho, as of the dates and for the periods indicated.  As noted in the
tables, certain data for the nine months ended September 30, 1993 have been
adjusted to reflect the rescission in November 1993 of an earlier treasury stock
purchase by Concho of 16,267 shares of Concho Common Stock for $344,860. Results
of operations for the nine months ended September 30, 1993 are not necessarily
indicative of results for a full fiscal year.  The financial data should be read
in conjunction with the historical consolidated financial statements of Concho
and related notes included elsewhere herein.

<TABLE>
<CAPTION>
 
    
                                                (dollars in thousands, except per share data)
                                                                                                         Nine Months        
                                                              Years Ended December 31,                      Ended       
                                        --------------------------------------------------------------   September 30, 
                                          1988      1989        1990           1991           1992            1993
                                        --------  --------  -------------  -------------  ------------  ----------------
<S>                                     <C>       <C>          <C>            <C>            <C>           <C>
OPERATING RESULTS:
 
Net interest income...................  $ 2,129   $ 2,068        $ 2,409        $ 2,631       $ 3,079         $ 2,721
Provision for loan losses.............      590       247            195            120           205             105
Noninterest income....................      634       405            714            861         1,116             857
Noninterest expense...................    2,079     2,235          2,609          2,894         3,054           2,519
                                        -------   -------        -------        -------       -------         -------
Income before income taxes............       94        (9)           319            478           936             954
Provisions (benefit) for income taxes         -         -              -             47           191             348
                                        -------   -------        -------        -------       -------         -------
Net income before cumulative effect of
 accounting change ...................       94        (9)           319            431           745             606
Cumulative effect of accounting change
 .....................................        -         -              -              -             -            (231)
                                        -------   -------        -------        -------       -------         -------
Net income............................  $    94   $    (9)       $   319        $   431       $   745         $   375
                                        =======   =======        =======        =======       =======         =======
 
Net income per Concho Common
Share before cumulative effect of
 accounting change ...................  $  0.45   $(0.04A)       $  1.52        $  2.05       $  3.70         $   3.01(2)
Net income per Concho
Common Share..........................  $  0.45   $(0.04A)       $  1.52        $  2.05       $  3.70         $   1.86(2)
 
FINANCIAL POSITION:
 
Assets................................  $66,360   $71,396        $72,089        $80,808       $88,864         $ 89,455(2)
Loans.................................   33,518    33,734         34,627         39,158        42,597           43,364
Investment Securities.................   20,006    18,220         21,813         28,697        33,807           34,798
Deposits..............................   58,953    65,082         65,535         73,665        81,097           80,903
Stockholders' equity..................    4,006     4,325          4,583          5,088         5,706            6,161(2)
 
SIGNIFICANT RATIOS:
 
Return on assets......................     0.14%    -0.01%          0.46%          0.57%         0.89%            0.42%
Return on equity......................     2.18     -0.21           6.88           9.52         15.93            16.24
Net interest margin...................     3.64      3.48           3.93           3.95          4.15             4.45
Earning assets to assets..............    89.16     86.93          87.71          88.04         89.08            91.66
Book value per share(1)...............  $ 19.14   $ 20.58        $ 21.79        $ 24.21       $ 28.30           $30.55(2)
</TABLE>

(Footnotes appear on following page)

                                       37
<PAGE>



_____________________

(1) At period end
(2) As adjusted to reflect the rescission in November 1993 of an earlier
    treasury stock purchase by Concho of 16,267 shares of Concho Common Stock
    for $344,860. Without such adjustment, net income per Concho Common Share
    before cumulative effect of accounting change was $3.12, net income per
    Concho Common Share was $1.93, assets were $89,110, stockholders' equity was
    $5,817 and book value per share was $31.38.

                                       38
<PAGE>

          MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                      AND RESULTS OF OPERATIONS OF CONCHO

                                  INTRODUCTION

  Included in this review are the following sections:

     I.  Overview of Operations

    II.  Net Interest Income

   III.  Asset Quality

    IV.  Deposits

     V.  Return on Equity and Assets

    VI.  Liquidity and Interest Rate Sensitivity

   VII.  Capital

  VIII.  Discussion of First Nine Months of 1993 versus First Nine Months of 
         1992

  This discussion should be read in conjunction with the financial statements,
notes and tables included elsewhere in this Prospectus.  Definitions of terms
used in this discussion include:

Average Balances

  All average balances are calculated on the basis of daily averages.  Interim
period annualizations are based on actual days in the relevant period.

Fully Taxable Equivalent Basis (FTE):

  Income on earning assets which is subject to either a reduced rate or zero
rate of income tax has been adjusted to give effect to the statutory federal
income tax rate of 34%.  Where appropriate, yield calculations include these
adjustments.

Net Interest Income:

  Interest and related fee income on earning assets (FTE basis where
appropriate) reduced by total interest expense on interest bearing liabilities.

Net Interest Margin:

  Net interest income on an FTE basis expressed as a percent of average earning
assets.

                                       39
<PAGE>

I.  OVERVIEW OF OPERATIONS

General

  Concho Bancshares, Inc. is a one bank holding company formed in 1979 and owns
a majority interest in the Southwest Bank of San Angelo, Texas. Southwest Bank
has a wholly owned subsidiary, SWB Investment Centre, Inc., a registered
investment advisor.

Results of Operations

  Concho's earnings increased 35.1%, and 72.9%, in the years ended 1991 and
1992, respectively. 1990's net income of $319,114 was a significant increase
over the net loss of $9,399 experienced in 1989. The improved earnings trend is
attributable to higher net interest income and increases in noninterest income.
Net interest income in 1991 was 9.2% over 1990 and 1992 was 17% over 1991.
Concho's net interest margins for 1990, 1991 and 1992 were 4.32%, 4.25% and
4.43%, respectively.

Asset and Liability Review

  Total assets at December 31, 1992 amounted to $88,864,346, representing a 10%
increase over the year end total of $80,808,176 in 1991. Total investment
securities including federal funds sold were $36,356,858 at year end 1992,
reflecting a 15% growth over 1991. Investments as a percent of total assets at
year's end were 39.1% and 40.9% as of 1991 and 1992. Loans net of reserves and
unearned interest grew by 8.8% in 1992 to $42,596,605. The growth was
concentrated in commercial real estate loans. Total deposits increased by
$7,430,444 to end 1992 at $81,245,690. Transaction account balances grew by
$7,718,459 while time deposits declined by $308,015.

  Nonperforming assets totaled $1,497,305 at December 31, 1992, a total that was
$198,821 below the previous year-end balance.

                                       40
<PAGE>

Table 1 - Average Daily Balance Sheets -- Concho

  The following table shows Concho's consolidated balances of assets,
liabilities, and capital computed principally on an average daily basis for the
three years ended December 31, 1992 (000's omitted):
<TABLE>
<CAPTION>
 
                                             Year Ended December 31,
                                         ------------------------------
ASSETS                                    1990        1991       1992
- ---------------------------              -------  ------------  -------
<S>                                      <C>      <C>           <C>
Cash and due from banks                  $ 3,041       $ 3,407  $ 3,801
 
Interest-bearing deposits in banks         2,089            41       --
 
Federal funds sold                         2,090         2,883    2,767
 
Taxable investment securities             21,538        25,952   29,701
 
Tax-exempt investment securities              --            --       --
 
Net loans                                 35,558        37,682   41,717
 
Bank premises and equipment                3,277         3,168    3,167
 
Other assets                               2,270         2,463    2,124
                                         -------       -------  -------
 
    Total Assets                         $69,863       $75,596  $83,277
                                         =======       =======  =======
 
LIABILITIES AND SHAREHOLDERS' EQUITY
- ---------------------------------------
 
Non-interest-bearing demand deposits     $ 8,095       $ 8,284  $11,168
 
Interest-bearing demand deposits          24,769        26,283   30,007
 
Time deposits                             30,516        34,127   35,982
                                         -------       -------  -------
 
    Total deposits                        63,380        68,694   77,157
 
Federal funds purchased and other            125         1,258      277
  short-term borrowings
 
Dividends payable                              5             5        5
 
Long-term debt                             1,280            --      723
 
Other liabilities                            434           616      411
 
Shareholders' equity                       4,639         5,023    5,397
                                         -------       -------  -------
 
    Total Liabilities and Equity         $69,863       $75,596  $83,277
                                         =======       =======  =======
</TABLE>

                                       41
<PAGE>

[II. NET INTEREST INCOME


TABLE 2 - INCOME AVERAGE AND YIELD ON INTEREST-EARNING ASSETS AND EXPENSE AND
          AVERAGE RATE ON INTEREST-BEARING LIABILITIES -- CONCHO

  The following table shows the interest income and average yield on
interest-earning assets and interest expense and average rate on
interest-bearing liabilities for the three years ended December 31, 1992, (000's
omitted).  The calculations of average yields and rates are based upon the
average daily balances in Table 1. Non-accrual loans are included in the average
daily balance of loans and any interest income recognized on a cash basis is
included in interest income on loans:

<TABLE>
<CAPTION>
 
                                           1990              1991              1992
                                   -----------------  -----------------  -----------------
                                    INCOME    YIELD    INCOME    YIELD    INCOME    YIELD
                                   (EXPENSE)  (RATE)  (EXPENSE)  (RATE)  (EXPENSE)  (RATE)
                                   ---------  ------  ---------  ------  ---------  ------
<S>                                <C>        <C>     <C>        <C>     <C>        <C>
Federal funds sold                   $  187    8.95%    $  221    7.67%    $  120    4.34%
 
Interest-earning deposits               197    9.43          6    8.98         --      --
 
Taxable investment securities         1,924    8.93      2,158    8.32      1,929    6.49
 
Tax-exempt investment 
 securities (1)                         --      --         --      --         --      --
 
Net loans (1)                         4,129   11.61      3,921   10.41      3,818    9.15
                                     ------   -----     ------   -----     ------    ----
 
Interest income                       6,437   10.51      6,306    9.47      5,867    7.91
 
Interest-bearing deposits             3,869    7.00      3,553    5.88      2,665    4.04
 
Federal funds purchased and other
 short-term borrowings                   11     8.8        121    9.62         14    5.05
 
Long-term debt                          148   11.56         --      --        109    9.50
                                     ------   -----     ------   -----     ------    ----
 
Interest expense                      4,028    7.11      3,674    5.96      2,788    4.14
                                     ------   -----     ------   -----     ------    ----
 
Net interest income and spread       $2,409    3.40%    $2,632    3.51%    $3,079    3.77%
                                     ======   =====     ======   =====     ======    ====
 
Net interest yield (2)                         3.93%              3.95%              4.15%
                                              =====              =====               ====
 
</TABLE>

- -----------------------
(1) Income and yield on tax-exempt investment securities and tax-exempt loans
    have been adjusted to a tax-equivalent basis based upon the Federal income
    tax rate of 34%, adjusted for disallowed interest deductions in accordance
    with Federal income tax regulations.

(2) The net yield on interest-earning assets is computed by dividing net
    interest income by total interest-earning assets.

                                       42
<PAGE>


TABLE 3 - ANALYSIS OF CHANGES IN INTEREST INCOME AND INTEREST EXPENSE -- CONCHO

  The following table sets forth the dollar amount of increase (decrease) in
interest income resulting from changes in the volume of interest-earning assets
and interest-bearing liabilities and from changes in yields and rates (000's
omitted):

<TABLE>
<CAPTION>
 
 
                                1991 Compared to 1990             1992 Compared to 1991
                            ----------------------------  ---------------------------------------
                            Volume    Rate      Total       Volume           Rate          Total
                            -------  ------  -----------  -----------  -----------------  -------
<S>                         <C>       <C>     <C>          <C>         <C>                 <C>  
Federal funds sold and
 interest- earning
 deposits ................  $ (120)   $ (37)  $ (157)      $  (12)         $ (95)           $ (107)
 
Taxable investment
 securities ..............     394     (160)     234          312           (541)             (229)
 
Tax-exempt investment
 securities(1) ...........      --      --       --           --              --                --
 
Loans(1)..................     244     (452)    (208)         420           (523)             (103)
                              ----    -----    -----         ----         -------           ------
 
Interest income...........     518     (649)    (131)         720         (1,159)             (439)
 
Time deposits.............     361     (677)    (316)         326         (1,214)             (888)
 
Federal funds purchased
 and other short-term
 borrowings ..............     100       10      110         (94)            (13)             (107)
 
Long-term debt............    (148)     --      (148)        109              --               109
                              ----    -----    -----         ----         -------           ------
 
Interest expense..........     313     (667)    (354)        341           (1,227)            (886)
                              ----    -----    -----         ----         -------           ------
 
Net interest income ......    $205    $  18    $ 223         $379         $    68           $  447
                              ----    -----    -----         ----         -------           ------
 
</TABLE>

- -----------------------------
(1)   Income on tax-exempt investment securities and tax-exempt loans has been
      adjusted to a tax-equivalent basis based upon the Federal income tax rate
      of 34%, adjusted for disallowed interest deductions in accordance with
      Federal income tax regulations.

Note: Volume/rate variances (changes in volume times changes in rate) have been
      allocated to amounts attributable to changes in volume and to changes in
      rates in proportion to the amounts directly attributable to those changes.

                                       43
<PAGE>

TABLE 4 - COMPOSITION OF INVESTMENT SECURITIES -- CONCHO

The table below sets forth the composition of investment securities at the dates
indicated:
<TABLE>
<CAPTION>
 
                                         DECEMBER 31,
                             -------------------------------------
                                1990         1991         1992
                             -----------  -----------  -----------
 
<S>                          <C>          <C>          <C>
U.S. Treasury..............  $ 3,029,425  $ 5,100,869  $17,511,071
U.S. Government agencies...   11,764,443   13,320,280   12,211,810
Other......................    7,019,625   10,275,665    4,083,940
                             -----------  -----------  -----------
 
                             $21,813,493  $28,696,814  $33,806,821
                             ===========  ===========  ===========
</TABLE>

TABLE 5 - MATURITY AND YIELD ON SECURITIES -- CONCHO

The following table shows the maturities of investment securities at December
31, 1992 and the weighted average yields (for tax exempt obligations on a fully
taxable basis assuming a 34% tax rate adjusted for disallowed interest
deductions in accordance with Federal income tax regulation) of such securities:

<TABLE> 
<CAPTION> 
                                                                      MATURING
                          ---------------------------------------------------------------------------------------------------
                                                        AFTER ONE BUT         AFTER FIVE BUT
                                WITHIN ONE YEAR        WITHIN FIVE YEARS     WITHIN TEN YEARS           AFTER TEN YEARS
                          -----------------------     -------------------    ------------------   ---------------------------
                             AMOUNT         YIELD      AMOUNT      YIELD      AMOUNT    YIELD         AMOUNT          YIELD
                          -----------      ------     -----------  ------    --------   -------   -------------      --------
<S>                       <C>              <C>        <C>          <C>       <C>        <C>        <C>                <C> 
U.S. Treasury              $2,545,219       5.08%      14,965,852   5.53%    $     --        --     $       --             --%
U.S. Government agencies        6,236      11.42          893,425   2.96       325,741      6.92      10,986,409         6.75
Other                       1,145,216       4.60               --     --            --       --        2,938,724         6.74
                           ----------     -------      ----------   -----     ---------     ----    ------------       ------
 
                           $3,696,671       4.94%     $15,859,277   5.39%    $ 325,741      6.92%   $ 13,925,133         6.75%
                           ==========     =======      ==========   =====     =========     ====    ============       ======
 
</TABLE>

TABLE 6 - COMPOSITION OF LOANS -- CONCHO

The table below sets forth the amount of loans outstanding at the end of the
years indicated, according to type of loan (000's omitted):
<TABLE>
<CAPTION>
 
                                     1988     1989     1990     1991     1992
                                    -------  -------  -------  -------  -------
 
<S>                                 <C>      <C>      <C>      <C>      <C>
Real estate loans:
  Construction....................  $ 2,264  $ 1,400  $ 1,827  $ 1,250  $ 1,659
  Mortgage........................    7,834    8,928    8,471    8,307    7,886
Commercial, financial and
 agricultural.....................   17,213   18,447   15,650   20,380   22,333
Installment loans to individuals..    6,820    8,231    8,943    9,574   11,343
                                    -------  -------  -------  -------  -------
 
    Total loans...................  $34,131  $37,006  $34,891  $39,511  $43,221
                                    =======  =======  =======  =======  =======
 
</TABLE>

TABLE 7 - LOAN MATURITIES AND SENSITIVITY TO CHANGES IN INTEREST RATES -- CONCHO

The amounts of total loans (excluding real estate mortgages and installment
consumer loans) outstanding as of December 31, 1992, which, based on remaining
scheduled repayments of principal, are due in (i) one year or less, (ii) more
than one year but less than five years, and (iii) more than five years, are
shown in the following table.  The amounts due after one year are classified
according to the sensitivity to changes in interest rates.  Aggregate maturities
of loan balances which are due:

                                       44
<PAGE>

<TABLE> 
<CAPTION> 
                                                                        After one year
                                                         In one year      but within           After
                                                           or less        five years         five years
                                                        ------------      ----------          ---------- 
<S>                                                     <C>               <C>                 <C> 
Real estate construction..........................       $ 1,275,172       $   383,519         $      --
Commercial, financial and agricultural loans......        12,598,033         6,632,548          3,102,007
 
Loans with maturities after one year for which:
  Interest rates are fixed or predetermined.......                  $15,293,010
  Interest rates are floating or adjustable.......                       18,222
                                                                     ----------
 
                                                                    $15,311,232
                                                                    ===========

</TABLE> 
 
III.  ASSET QUALITY
 
TABLE 8 - RISK ELEMENTS -- CONCHO
 
<TABLE> 
<CAPTION> 

PAST DUE AND NON-ACCRUAL LOANS:                             1988        1989        1990       1991      1992
                                                         ----------  ----------- ----------  ---------  --------
<S>                                                      <C>         <C>          <C>        <C>        <C>  
Non-accrual loans.................................       $445,834     $237,829     $643,157   $864,345  $638,371
Loans 90+ days past due...........................        153,343      951,318      240,321    454,111   145,105
Restructured loans................................        753,233      821,122    1,073,088         --        --
Interest accrued and lost on non-accrual loans ...         60,411       28,988      101,317     72,867    96,044
Interest actually received on non-accrual loans ..            --           --           --          --        --
</TABLE> 
 
Loans in serious doubt to be repaid as of December 31, 1993  -  $  317,931
                                                                ==========

Outstanding loan & farm & agricultural loans:   3.80% Percentage of total loans
                                                =====                          

At December 31, 1988, 1989, 1990, 1991, and 1992, the allowance for loan losses
has been allocated within the categories of loans set forth below, according to
the amount deemed to be reasonably necessary to provide for the possibility of
losses being incurred.  The amount of such components and the ratio of the
corresponding loan amounts to total loans outstanding are as follows:



<TABLE>
<CAPTION>
 
                                                                RATIO OF LOAN       
                                                 ALLOWANCE     AMOUNT TO TOTAL      
DECEMBER 31, 1992                                 AMOUNT      LOANS OUTSTANDING    
- ------------------                               ---------     -----------------    
<S>                                              <C>           <C>                  
Constructions loans                               $ 17,101            3.84%         
Mortgage loans                                      85,592           18.25          
Commercial, financial and agricultural loans       332,483           51.67          
Installment loans to individuals                   163,558           26.24          
                                                  --------           -----          
                                                                                    
                                                  $598,734          100.00%         
                                                  ========          ======          
December 31, 1991                                                                   
- ------------------                                                                  
Construction loans                                $ 14,677            3.16%         
Mortgage loans                                     100,902           21.03          
Commercial, financial and agricultural loans       304,631           51.58           
 
</TABLE>

                                       45
<PAGE>

<TABLE>
<S>                                              <C>              <C>
Installment loans to individuals                   126,929         24.23
                                                  --------        ------
 
                                                  $547,139        100.00%
                                                  ========        ======
 
December 31, 1990
- ------------------                                 

Construction loans                                $ 16,396          5.24%
Mortgage loans                                      88,359         24.28
Commercial, financial and agricultural loans       312,281         44.85
Installment loans to individuals                    92,981         25.63
                                                  --------        ------
 
                                                  $510,017        100.00%
                                                  ========        ======
 
December 31, 1989
- ------------------                               

Construction loans                                $  8,285          3.78%
Mortgage loans                                      38,663         24.12
Commercial, financial and agricultural loans       423,529         49.86
Installment loans to individuals                    41,654         22.24
                                                  --------        ------
 
                                                  $512,131        100.00%
                                                  ========        ======
 
December 31, 1988
- ------------------                                

Construction loans                                $  8,572          6.63%
Mortgage loans                                      43,367         22.95
Commercial, financial and agricultural loans       497,693         50.44
Installment loans to individuals                    62,761         19.98
                                                  --------        ------
 
                                                  $612,393        100.00%
                                                  ========        ======
</TABLE>

                                       46
<PAGE>

TABLE 9 - LOAN LOSS EXPERIENCE AND ALLOWANCE FOR LOAN LOSSES -- CONCHO

  The following table summarizes the daily average amount of net loans
outstanding; changes in the allowance for loan losses arising from loans charged
off, and recoveries on loans previously charged off, by loan category; additions
to the allowance which have been charged to operating expense; and the ratio of
net loans charged off to average loans outstanding:

<TABLE>
<CAPTION>
 
                                                                1988          1989          1990          1991          1992
                                                            ------------  ------------  ------------  ------------  ------------
<S>                                                         <C>           <C>           <C>           <C>           <C>  
Daily average amount of net loans outstanding ............  $33,185,480   $33,543,512   $35,557,501   $37,682,141   $41,716,845
                                                            ===========   ===========   ===========   ===========   ===========
 
Balance of allowance for loan losses at beginning of
 period ..................................................  $   505,264   $   612,393   $   512,131   $   510,016   $   547,139
 
Loans charged off
- ------------------                                             
 
Commercial, financial and agricultural....................      463,593       364,648       267,039        72,000       127,696
Loans to individuals......................................       39,625        10,905        14,365        17,620        53,260
All other loans...........................................       13,694            --        12,387         3,225            --
                                                            -----------   -----------   -----------   -----------   -----------
 
Total loans charged off...................................      516,912       375,553       293,791        92,845       180,956
 
Recoveries of loans previously charged off
- --------------------------------------------                   
 
Commercial, financial and agricultural....................       32,263        24,058        95,095         6,946        26,117
Loans to individuals......................................        1,778         4,723         1,581         3,022         1,434
All other loans...........................................           --            --            --            --            --
                                                            -----------   -----------   -----------   -----------   -----------
 
Total recoveries..........................................       34,041        28,791        96,676         9,968        27,551
                                                            -----------   -----------   -----------   -----------   -----------
 
Net loans charged off.....................................      482,871       346,762       197,115        82,877       153,405
 
Additions to allowance charged to operating expense (1)...      590,000       246,500       195,000       120,000       205,000
                                                            -----------   -----------   -----------   -----------   -----------
 
Balance at end of period..................................  $   612,393   $   512,131   $   510,016   $   547,139   $   598,734
                                                            ===========   ===========   ===========   ===========   ===========
 
Ratio of net charge offs to the daily average amount of
 loans outstanding .......................................         1.46%         1.03%         0.55%         0.22%         0.37%
                                                            ===========   ===========   ===========   ===========   ===========
 
 
</TABLE>

- ----------------------------
(1) Additions to the allowance were based primarily on historical experience,
    current economic conditions, and the condition of the loan portfolio at
    year-end.
 
IV.    DEPOSITS

TABLE 10 - COMPOSITION OF DEPOSITS -- CONCHO

  The following table presents the average daily amount and the average rate
paid on deposits (000's omitted):

                                       47
<PAGE>

<TABLE>
<CAPTION>
 
 
                                   1990             1991              1992
                             ---------------  -----------------  --------------
                             AMOUNT    RATE   AMOUNT     RATE    AMOUNT   RATE
                             -------  ------  -------  --------  ------  ------
<S>                          <C>      <C>     <C>      <C>       <C>     <C>
Noninterest bearing demand
 deposits                    $ 8,095          $ 8,284            $ 9,568
 
Interest bearing demand
 deposits                     20,359   6.61%   21,708   5.06%     23,170   3.27%
 
Savings and money market
 accounts                      4,410   4.97     4,575   5.01       6,837   3.33
 
Time deposits
  Less than $100,000          17,850           21,590             23,118
  $100,000 or more            12,666           12,537             12,864
                             -------          -------            -------
 
   Total time deposits        30,516   7.55    34,127   6.52      35,982   4.67
                             -------          -------            -------
 
   Total deposits            $63,380          $68,694            $75,557
                             =======          =======            =======
 
</TABLE>

TABLE 11 - MATURITY DISTRIBUTION OF TIME CERTIFICATES OF $100,000 OR MORE --
CONCHO

  Time certificates of $100,000 or more outstanding at December 31, 1992 will
mature as follows (000's omitted):

<TABLE>
 
       <S>                <C>
        Under 3 months    $ 5,910
        3 to 6 months       3,157
        6 to 12 months      2,841
        Over 12 months      1,100
                          -------
                          $13,008
                          =======
 
</TABLE>


V.  RETURN ON EQUITY AND ASSETS

TABLE 12 - RETURN ON EQUITY AND ASSETS -- CONCHO

  The ratio of net earnings to average shareholders' equity and daily average
total assets and certain other ratios are presented below:
<TABLE>
<CAPTION>
                                                  Year ended December 31,
                                                ----------------------------
                                                  1990      1991      1992
                                                --------  --------  --------
<S>                                             <C>       <C>       <C>
Percentage of net earnings to:
  Average total assets                             0.46%     0.57%     0.90%
  Average shareholders' equity                     6.92      8.62     12.73
 
Percentage of dividends declared per common
 share to earnings per common share               16.39     12.12      7.02
 
Percentage of average shareholders' equity to
 daily average total assets                        6.64      6.64      7.06
 
</TABLE>

                                       48
<PAGE>

VI.  NONINTEREST INCOME AND EXPENSE AND INCOME TAXES

  Noninterest income in 1992 was $1,118,654, representing a 29.8% improvement
over 1991. The consistent rise in noninterest income is due primarily to
increases in service charge revenues and from improved volumes in the subsidiary
bank's investment center. Service charge income increased from $448,156 in 1990
to $517,572 in 1991 and $630,855 in 1992 and resulted from volume and pricing
increases.

  The reserve for loan losses is reviewed by management and the board of
directors on a monthly basis and maintained at levels determined by analyzing
the risk of losses in the loan portfolio. This risk is calculated by rating
individual loans and applying quantitative and subjective considerations to
arrive at an adequate level of reserves. As the quality of the loan portfolio
improved, the provision dropped from $195,000 in 1990 to $120,000 in 1991. The
provision rose to $205,000 in 1992 due to an increase in consumer loan losses.
The reserve balance at year end 1992 totalling $598,734 represents 1.41% of net
loans as compared to 1.40% in 1991 and 1.47% in 1990.

  Noninterest expenses totalled $3,053,852 in 1992 for a 5.5% increase over the
$2,893,116 incurred in 1991. The increase reflects a $152,107 increase in
salaries and a $50,413 increase in employee benefits. Employee benefits rose
principally due to a $8,187 increase in matching of the 401(k) pension plan and
a $25,000 contribution to the profit sharing plan. FDIC deposit insurance
expense in 1992 amounted to $165,847 as compared to $135,700 in 1991 and $73,877
in 1990. These increases reflect the higher rates assessed by the FDIC. In 1991,
a non-recurring expense of $50,000 was incurred from a settlement of a disputed
claim by the Internal Revenue Service resulting from the failure by a bank
customer to pay federal withholding taxes. A consulting firm, employed in 1990
to make recommendations regarding profit improvement opportunities, completed
its work in 1992 resulting in a one-time expense of $69,975. There was a
non-recurring gain of $67,500 in 1992 due to the resignation of a director and
the corresponding cancellation of the director's deferred compensation plan.
Concho has benefited from a tax loss carryforward in each of the years
discussed. The benefits, which amounted to $108,477, $164,469, and $67,727 in
1990, 1991 and 1992, respectively, were fully exhausted in 1992.

NONINTEREST INCOME AND NONINTEREST EXPENSE -- CONCHO

<TABLE>
<CAPTION>
 
                                         1990    1991    1992
                                        ------  ------  ------
<S>                                     <C>     <C>     <C>
Noninterest income
  Service charges on deposit accounts. $  448  $  518  $  631
  Securities gains (losses)...........    (48)     (5)    (85)
  Other...............................    316     349     573
                                       ------  ------  ------
    Total noninterest income..........    716     862   1,119
                                       ------  ------  ------
 
Noninterest expense
  Salaries and related costs..........  1,195   1,198   1,401
  Net occupancy.......................    282     303     318
  Equipment expense...................    113     114     125
  Professional services...............    110     249     218
  Data processing.....................    105     115     118
  Stationery and supplies.............     65      62      66
  Business development................     89      91      62
  Foreclosed asset expense............    170     249     181
  Other expense.......................    480     512     565
                                       ------  ------  ------
    Total noninterest expense.........  2,609   2,893   3,054
                                       ------  ------  ------
    Net noninterest expense...........  1,893   2,031   1,935
    Net noninterest expense as percent
    of average assets ................   2.71%   2.69%   2.32%
</TABLE>

                                       49
<PAGE>

VII. LIQUIDITY AND INTEREST RATE SENSITIVITY

  The cash flow requirements of Concho are satisfied through lease income and
dividends from the bank subsidiary. The bank subsidiary maintains a high level
of liquidity within its asset mix by continually monitoring maturing investment
securities and loans. The bank also has a $1,000,000 unfunded line of credit for
short term liquidity needs.

  Through active asset/liability management, interest rate risk is controlled to
minimize the impact of fluctuating interest rates on earnings and the market
values of assets. Although interest rates changed significantly from 1990 to the
end of 1992, Concho's net interest margin remained very stable. This stability
is attributable to successfully matching volumes of assets and liabilities in
similar maturities.

ASSET AND LIABILITY MATURITY REPRICING SCHEDULE
<TABLE>
<CAPTION>
 
$(thousands)
                                                               DECEMBER 31, 1992
                           ----------------------------------------------------------------------------------------------
                                                               RATE-SENSITIVE WITHIN
                           ----------------------------------------------------------------------------------------------
                           FLOATING     1-30      31-60      61-90      91-180    181-365       1-5       OVER
                             RATE       DAYS       DAYS       DAYS       DAYS       DAYS       YEARS     5 YEARS   TOTAL
                           ---------  --------   --------   --------   --------   --------   -------     -------   ------
<S>                        <C>        <C>        <C>        <C>         <C>        <C>        <C>        <C>       <C> 
ASSETS
  Short-term investments.   $ 2,550   $          $           $         $            $         $          $          $ 2,550
  Investment securities..     9,117      1,378       222         212        576       1,302     15,866     5,134     33,807
  Loans:
    Commercial...........    14,210      2,632     1,127       1,451      2,871       2,679      6,542               31,512
    R/E Construction.....     1,035         35       113         141        297         628        475     1,357      4,081
    Consumer.............     4,102        145       127         125        367         671        914     1,151      7,602
                            -------   --------   -------     -------   --------     -------   --------   -------    -------
      Total loans........    19,347      2,812     1,367       1,717      3,535       3,978      7,931     2,508     43,195
                            -------   --------   -------     -------   --------     -------   --------   -------    -------
      Total earning
       assets............    31,014      4,190     1,589       1,929      4,111       5,280     23,797     7,642     79,552
    Loan loss reserve....                                                                                   (599)      (599)
    Cash & due from banks     4,747                                                                                   4,747
      Other assets.......                                                                                  5,164      5,164
                            -------   --------   -------     -------   --------     -------    -------   -------    -------
      Total assets.......   $35,761   $  4,190   $ 1,589     $ 1,929   $  4,111     $ 5,280    $23,797   $12,207    $88,864
                            =======   ========   =======     =======   ========     =======    =======   =======    =======
LIABILITIES & EQUITY
  Deposits:
    Demand deposits......   $13,002   $   --     $   --      $   --    $    --      $   --     $   --    $   --     $13,002
    NOW, Savings & MMDA..    32,187       --         --          --         --          --         --        --      32,187
    CD's less-than 
     $100,000............        --      2,891     1,831       3,004      6,630       5,667      2,891       --      22,914
    CD's greater-than
     $100,000............       101      2,445     1,632       1,732      3,750       2,232      1,100       --      12,992
                            -------   --------   -------     -------   --------     -------    -------   -------    -------
      Total deposits.....    45,290      5,336     3,463       4,736     10,380       7,899      3,991       --      81,095
  Other borrowings.......        85        --        --          --         --          --       1,154       --       1,239
  Other liabilities......        --        --        --          --         --          --         --        824        824
  Equity.................        --        --        --          --         --          --         --      5,706      5,706
                            -------   ---------  -------     -------   --------     -------    -------   -------    -------
      Total liab. &
       equity............   $45,375   $  5,336   $ 3,463     $ 4,736   $ 10,380     $ 7,899    $ 5,145   $ 6,530    $88,864
                            =======   ========   ========    =======   ========     =======    =======   =======    =======
Interest sensitivity gap.    (9,614)  $ (1,146)   (1,874)    $(2,807)  $ (6,269)               $(2,619)  $18,652    $ 5,677
Cumulative gap...........    (9,614)   (10,760)  (12,634)    (15,441)   (21,710)               (24,329)   (5,677)
Cumulative gap to total
 assets..................    -10.82%    -12.11%   -14.22%     -17.38%                -24.43%    -27.38%               -6.39%
                            ========  =========  ========    ========               ========   ========             ========
December 31, 1991:
Cumulative gap...........    (2,493)  $(10,691) $(12,288)   $(15,350)  $(19,278)   $(21,827)  $(12,897)
Cumulative gap to total
 assets..................     -3.09%    -13.23%   -15.21%     -19.00%    -23.86%     -27.01%    -15.96%
                            ========  =========  ========    ========  =========    ========   ========
</TABLE> 
 
VIII. CAPITAL

  At year end 1992, total shareholders' equity was $5,706,199, an increase of
$618,544 over December 31, 1991. Concho's risk based capital ratio has risen
from 12.79% in 1990 to 14.30% at year end 1992. This ratio is well above the
minimum 8.00% required by federal regulations. Book value of Concho's stock at
year-end 1992 was $28.30 per share, or a 16.9% increase over 1991's $24.21 per
share. Concho has declared an annual cash dividend of $.25 per share each of the
past three years.

                                       50
<PAGE>

IX. DISCUSSION OF NINE MONTHS ENDED SEPTEMBER 30, 1993 VERSUS NINE MONTHS ENDED
SEPTEMBER 30, 1992

GENERAL

  Net interest income for the first nine months of 1993 was $2,720,676, which
represents a 16.2% increase over the same period in 1992 due primarily to an
improving net interest margin. Net earnings were reduced by $231,213 as a result
of an accounting change conforming with the requirements of FAS No. 109. This
one-time adjustment reduced net earnings to $375,026 for the nine months, down
35% from the $574,673 for the same period in 1992. Total assets were
$89,110,076, up 5.5%, and total deposits showed a similar increase to
$80,902,873. While total outstanding loans have declined less than one percent,
investment securities have increased almost 9% to $34,795,540. Nonperforming
assets have declined during 1993 by $367,351 to $1,129,954. Shareholders' equity
has increased to $5,816,604, up 4.1% from 1992's $5,586,083. This increase in
equity is after a purchase into treasury of 16,267 shares at a cost of $344,860.
In November 1993, the purchase of these shares was rescinded, resulting in the
shares being reissued and $344,860 being refunded to Concho. As adjusted to
reflect such rescission, shareholders' equity at September 30, 1993 would have
been $6,161,464.

                                       51
<PAGE>

AVERAGE BALANCES, INCOME AND EXPENSES, YIELDS AND RATES (1)

$(thousands)
<TABLE>
<CAPTION>
 
 
                                                  NINE MONTHS ENDED SEPTEMBER 30,
                                       ------------------------------------------------------
                                                  1992                        1993
                                       --------------------------  --------------------------
                                       Average  Income/   Yield/   Average   Income/  Yield/
                                       Balance  Expense    Rate    Balance   Expense   Rate
                                       -------  --------  -------  --------  -------  -------
<S>                                    <C>      <C>       <C>      <C>       <C>      <C>
ASSETS
Short-term investments................ $ 2,717   $   97     4.77%  $ 2,838    $   74    3.49%
Investment securities:
  Taxable.............................  28,667    1,459     6.80    34,077     1,444    5.67
  Tax exempt..........................      --       --       --        --        --      --
                                       -------   ------            -------    ------
   Total securities...................  28,667    1,459     6.80    34,077     1,444    5.67
Loans: (2)
  Commercial..........................  27,856    2,027     9.73    31,149     2,052    8.81
  R/E construction....................   1,978      125     8.45     2,160       136    8.42
  R/E mortgage........................   4,868      307     8.4      3,871       266    9.19
  Consumer............................   7,016      499     9.51     6,624       508   10.25
                                       -------   ------            -------    ------
   Total loans........................  41,718    2,958     9.48    43,804     2,962    9.04
                                       -------   ------            -------    ------
   Total earning assets...............  73,102    4,514     8.26    80,719     4,480    7.42
Other assets..........................   9,164                       8,497
                                       -------                     -------
   Total assets.......................  82,266                      89,216
                                       =======                     =======
LIABILITIES AND EQUITY
Deposits:
  Noninterest-bearing deposits........   8,932                      12,636
  Interest checking...................  23,412      593     3.39    25,521       506    2.65
  Savings.............................   2,775       67     3.23     3,182        59    2.48
  Money market accounts...............   3,850      108     3.75     5,293       115    2.90
Time deposits:
  CD's less-than $100,000.............  23,318      864     4.95    22,944       652    3.80
  CD's greater-than $100,000:.........  12,634      450     4.76    11,652       339    3.89
                                       -------   ------            -------    ------
   Total deposits.....................  74,921    2,082     3.72    81,228     1,671    2.75
  Other borrowings....................   1,263       90     9.53     1,272        88    9.25
                                       -------   ------            -------    ------
   Total interest-bearing liabilities.  67,252    2,172     4.32    69,864     1,759    3.37
                                                 ------                       ------
Other liabilities.....................     685                         955
                                       -------                      ------
  Total liabilities...................  76,869                      83,455
Stockholders' equity..................   5,397                       5,761
                                       -------                     -------
   Total liabilities and equity....... $82,266                     $89,216
                                       =======                     =======
Net interest income...................            2,342     4.28               2,721    4.51
Provision for loan losses.............              (67)   -0.12                (105)  -0.17
                                                 ------   ------              ------  ------
Net funds function....................           $2,275     4.16              $2,616    4.34
                                                 ======   ======              ======  ======
</TABLE>
- -------------------
(1) Fully taxable equivalent basis
(2) Nonaccrual loans are included in loan balances

                                       52
<PAGE>


RATE VOLUME ANALYSIS (1)(2)

<TABLE>
<CAPTION> 
$(thousands)
                                  CHANGE IN     RATE    VOLUME
                                 -----------------------------
                               INCOME/EXPENSE  EFFECT   EFFECT
- --------------------------------------------------------------
<S>                                 <C>        <C>      <C>
Earning assets:
  Short-term investments........     (23)       (26)    $  3
  Investment securities:
    Taxable.....................     (15)      (244)     229
    Tax exempt..................      --
                                    ----     ------     ---- 
      Total investments.........     (15)      (244)     229
  Loans:
    Commercial..................      25       (192)     217
    R/E construction............      11         (0)      11
    R/E mortgage................     (41)        28      (69)
    Consumer....................       9         39      (30)
                                    ----     ------     ----
      Total loans...............       4       (137)     141
                                    ----     ------     ----
        Total interest income...     (34)      (457)     423
                                    ----     ------     ----
Interest bearing liabilities:
  Interest checking.............     (87)      (129)      42
  Savings.......................      (8)       (16)       8
  Money market accounts.........       7        (24)      31
  Time deposits
    CD's less-than $100,000.....    (212)      (201)     (11)
    CD's greater-than $100,000:.    (111)       (82)     (29)
                                    ----     ------     ----
      Total deposits............    (411)      (541)     130
  Other borrowings..............      (2)        (3)       1
                                    ----     ------     ----
  Total interest expense........    (413)      (479)      66
                                    ----     ------     ----
  Net interest income...........    $379        $22     $357
                                    ====     ======     ====
</TABLE>
- ------------------
(1) Fully taxable equivalent basis
(2) The unallocated portion of the total change has been prorated into rate and
    volume components

                                       53
<PAGE>

Noninterest Income and Expense
<TABLE>
<CAPTION>
 
$(thousands)
                                 FOR THE NINE MONTHS ENDED
                                       SEPTEMBER 30                      CHANGE
                                 -------------------------         -----------------
                                  1992               1993             $         %
                                 ------             ------         -------   -------
<S>                              <C>                <C>              <C>      <C>
Noninterest Income.............
  Service charges on deposits..  $  425             $  474           $ 49     11.53%
  Trust fees...................
  Securities gains (losses)....
  Other........................     409                383            (26)    -6.36
                                 ------             ------           ----   -------
    Total noninterest income...     834                857             23      2.76
                                 ------             ------           ----   -------
Noninterest Expense
  Salaries and related costs...   1,061              1,155             94      8.86
  Net occupancy................     234                267             33     14.10
  Equipment expense............     182                176             (6)    -3.30
  Professional services........     121                211             90     74.38
  Data processing..............      94                 82            (12)   -12.77
  Stationery and supplies......      52                 76             24     46.15
  Business development.........      48                 59             11     22.92
  Foreclosed asset expense.....     139                120            (19)   -13.67
  Other expense................     379                373             (6)    -1.58
                                 ------             ------           ----   -------
    Total noninterest expense..   2,310              2,519            209      9.05
                                 ------             ------           ----   -------
      Net noninterest expense..  $1,476             $1,662           $186     12.60%
                                 ======             ======           ====   =======
      Net noninterest expense
      as a percent of average
      assets ..................    1.78%              1.86%
                                 ======             ======
 
</TABLE>
                                 LEGAL MATTERS

  The legality of the First Financial Common Stock to be issued in connection
with the Exchange Offer and Merger will be passed upon by McMahon, Surovik,
Suttle, Buhrmann, Cobb & Hicks, P.C.

                                    EXPERTS

  The consolidated financial statements of First Financial as of December 31,
1992 and 1991 and for each of the years in the three-year period ended December
31, 1992, incorporated by reference in this prospectus and elsewhere in the
registration statement have been audited by Arthur Andersen & Co., independent
public accountants, as indicated in their report dated January 13, 1993, with
respect thereto, and are incorporated by reference herein in reliance upon the
authority of said firm as experts in accounting and auditing.

  The consolidated financial statements of Concho as of December 31, 1992 and
1991 and for each of the years in the three-year period ended December 31, 1992,
included in this prospectus and elsewhere in the registration statement have
been audited by Armstrong, Backus & Co., L.L.P., independent public accountants,
as indicated in their report dated February 12, 1993, with respect thereto, and
are included herein in reliance upon the authority of said firm as experts in
accounting and auditing.

                                       54
<PAGE>

            INDEX TO CONCHO BANCSHARES, INC.'S FINANCIAL STATEMENTS

<TABLE> 
<CAPTION> 

                                                                            PAGE
                                                                            ----
<S>                                                                         <C> 
CONSOLIDATED FINANCIAL STATEMENTS FOR THE THREE YEARS ENDED DECEMBER 31, 
 1990, 1991 AND 1992
  Report of Independent Public Accountants...............................    F-1
  Consolidated Balance Sheets as of December 31, 1991 and 1992...........    F-2
  Consolidated Statements of Income for three years ended December 31, 
   1990, 1991 and 1992...................................................    F-4
  Consolidated Statements of Changes in Stockholders' Equity for the 
   three years ended December 31, 1990, 1991 and 1992....................    F-6
  Consolidated Statements of Cash Flows for the three years ended 
   December 31, 1990, 1991 and 1992......................................    F-7
  Notes to Consolidated Financial Statements.............................    F-9

UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS FOR THE NINE MONTHS ENDED 
 SEPTEMBER 30, 1992 AND SEPTEMBER 30, 1993

  Compilation Report.....................................................   F-25
  Consolidated Balance Sheets as of September 30, 1992 and 1993..........   F-26
  Consolidated Statements of Earnings for the nine months
   ended September 30, 1992 and 1993.....................................   F-27
  Consolidated Statements of Changes in Stockholders' Equity for the 
   nine months ended September 30, 1992 and 1993.........................   F-29
  Consolidated Statements of Cash Flows for the nine months ended 
   September 30, 1992 and 1993...........................................   F-31
  Notes to Consolidated Financial Statements.............................   F-33
</TABLE> 

                                       55
<PAGE>

Board of Directors
Concho Bancshares, Inc.


                          INDEPENDENT AUDITOR'S REPORT
                          ----------------------------

We have audited the accompanying consolidated balance sheets of Concho
Bancshares, Inc. (a Texas corporation) and subsidiary as of December 31, 1992
and 1991 and the related consolidated statements of income, changes in
shareholders' equity and cash flows for each of the three years in the period
ended December 31, 1992.  These financial statements are the responsibility of
the Company's management.  Our responsibility is to express an opinion on these
financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation. 
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the consolidated financial position of Concho Bancshares,
Inc. and subsidiary as of December 31, 1992 and 1991, and the results of their
operations and their cash flows for each of the three years in the period ended
December 31, 1992, in conformity with generally accepted accounting principles.

                                                 Armstrong, Backus & Co., L.L.P.



February 12, 1993

                                      F-1
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                          CONSOLIDATED BALANCE SHEETS
                          ---------------------------

                           DECEMBER 31, 1992 AND 1991


                                     ASSETS
                                     ------
<TABLE>
<CAPTION>
 
                                                      1992         1991
                                                   -----------  -----------
 
<S>                                     <C>        <C>          <C>
Cash and due from banks                 (Note 1)   $ 4,747,085  $ 4,957,032
Federal funds sold                      (Note 1)     2,550,000    2,900,000
Investment securities:                  (Notes 1
                                           & 2)
  United States government                          17,511,071    5,100,869
  United States agencies                            12,211,810   13,320,280
  Collateralized mortgage obligations                2,938,724    8,249,479
  Corporate bonds                                          -0-      300,215
  Stock in Federal Home Loan Bank                      303,337          -0-
  Mutual funds (net of unrealized loss 
   of $ 122,927 and $ 171,297)                         841,916    1,725,972
Loans (net of unearned income of
      $ 373,174 and $ 383,588 and
      allowance for loan losses of
      $ 598,734 and $ 547,354)          (Notes 1,   42,596,605   39,157,619
                                          4 & 9)
Land, building and equipment, net       (Notes 1,    2,967,864    2,956,751
                                          5 & 9)
Other real estate                                      853,229      686,225
Accrued interest                                       844,681      766,894
Other assets                             (Note 8)      498,024      686,840
Other assets                             (Note 8)      498,024      686,840
                                                   -----------  -----------
 
    TOTAL ASSETS                                   $88,864,346  $80,808,176
                                                   ===========  ===========
</TABLE>

The accompanying notes are an integral part of this statement.

                                      F-2
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                          CONSOLIDATED BALANCE SHEETS
                          ---------------------------

                           DECEMBER 31, 1992 AND 1991


                      LIABILITIES AND SHAREHOLDERS' EQUITY
                      ------------------------------------

                                  LIABILITIES
                                  -----------
<TABLE>
<CAPTION>
 
                                              1992        1991
                                          -----------  -----------
<S>                            <C>        <C>          <C>
 
Deposits:                      (Note 1)
  Demand                                  $13,002,139  $ 8,861,389
  NOW                                      29,225,118   25,627,409
  Savings                                   2,961,858    2,342,693
  Time, $ 100,000 and over                 12,992,397   13,775,576
  Other time                               22,913,661   23,057,662
Federal funds purchased         (Note 1)       85,000      170,000
Accrued interest                              210,548      305,496
Federal income tax payable                    181,858       47,000
Mortgage payable                (Note 10)   1,239,164    1,167,622
Other liabilities               (Note 8)      325,782      345,700
Minority interests                             20,622       19,974
                                          -----------  -----------
 
  TOTAL LIABILITIES                       $83,158,147  $75,720,521
                                          -----------  -----------
 
</TABLE>

Commitments and Contingencies  (Notes 7 & 12)

                              SHAREHOLDERS' EQUITY
                              --------------------
<TABLE>
<CAPTION>
 
<S>                             <C>        <C>           <C>
Common stock, par value $ .50,
  500,000 shares authorized,
  210,270 shares issued,
  201,653 and 210,168 shares
  outstanding, respectively                $   105,135   $   105,135
Additional paid-in capital                   4,660,218     4,660,218
Retained earnings               (Note 11)    1,189,750       496,807
Treasury stock                                (126,356)       (3,825)
Unrealized loss on investment in
  mutual funds                  (Note 2)      (122,548)     (170,680)
                                           -----------   -----------
 
    TOTAL SHAREHOLDERS' EQUITY             $ 5,706,199   $ 5,087,655
                                           -----------   -----------
 
    TOTAL LIABILITIES AND
      SHAREHOLDERS' EQUITY                 $88,864,346   $80,808,176
                                           ===========   ===========
</TABLE>

The accompanying notes are an integral part of this statement.

                                      F-3
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                       CONSOLIDATED STATEMENTS OF INCOME
                       ---------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990
<TABLE>
<CAPTION>
 
 
                                             1992         1991         1990
                                          -----------  -----------  -----------
<S>                           <C>         <C>          <C>          <C>

INTEREST INCOME               (Notes 1,
- ---------------                 4 & 9)
 
  Interest and fees on loans              $3,818,426   $3,921,071   $4,129,104
  Interest on Federal funds                  119,555      215,081      187,083
  Interest on deposits with
   banks                                         -0-        6,136      197,262
  Interest on investment
   securities:
    United States government                 618,308      264,546      212,494
    United States agencies                   928,353    1,092,400      978,479
    Corporate bonds                           23,556       46,935      121,670
    Mutual funds                              78,716      193,403      307,234
    Collateralized mortgage 
     obligations                             280,111      566,257      303,858
                                          ----------   ----------   ----------
 
                                          $5,867,025   $6,305,829   $6,437,184
                                          ----------   ----------   ----------
 
 
INTEREST EXPENSE
- ----------------
 
  Interest on deposits                    $2,665,097   $3,553,188   $3,868,666
  Interest on Federal funds                    2,933        5,081       10,417
  Interest on mortgage
   payable                    (Note 10)      119,512      115,766      148,660
                                          ----------   ----------   ----------
 
                                          $2,787,542   $3,674,035   $4,027,743
                                          ----------   ----------   ----------
 
    Net interest income                   $3,079,483   $2,631,794   $2,409,441
 
  Provision for loan losses   (Notes 1 
                                & 4)         205,000      120,000      195,000
                                          ----------   ----------   ----------
 
    Net Interest Income
     After Provision for Loan
     Losses                               $2,874,483   $2,511,794   $2,214,441
                                          ----------   ----------   ----------
 
 
OTHER OPERATING INCOME
- ----------------------
 
  Pension administration
   fees                                   $    7,700   $   20,000   $   24,000
  Gain (loss) on sale of
   assets                                     (9,939)     (57,072)       6,578
  Securities gains (losses)                  (85,405)      (4,495)     (48,738)
  Service charges                            630,855      517,572      448,156
  Rents                                       88,717       96,162       61,956
  FHLB dividends                               3,587          -0-          -0-
  Other                                      483,139      289,513      223,593
                                          ----------   ----------   ----------
 
                                          $1,118,654   $  861,680   $  715,545
                                          ----------   ----------   ----------
 
    Total Interest and Other
      Operating Income                    $3,993,137   $3,373,474   $2,929,986
 
</TABLE>

The accompanying notes are an integral part of this statement.

                                      F-4
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                       CONSOLIDATED STATEMENTS OF INCOME
                       ---------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990

                                  (Continued)

<TABLE>
<CAPTION>
 
 
                                                   1992         1991         1990
                                                -----------  -----------  -----------
 
<S>                          <C>                <C>          <C>          <C>
OTHER OPERATING EXPENSES
- ------------------------
 
  Salaries                                      $1,227,319   $1,075,212   $1,055,743
  Employee benefits          (Note 3)              173,193      122,780      139,511
  Occupancy expense          (Notes 1, 5 & 9)      318,013      303,254      281,834
  Other expenses             (Notes 1, 8 & 12)   1,490,746    1,526,134    1,271,694
  Capitalized loan costs     (Note 4)             (155,419)    (134,264)    (139,891)
 
                                                $3,053,852   $2,893,116   $2,608,891
                                                ----------   ----------   ----------
 
    NET INCOME BEFORE INCOME TAXES              $  939,285   $  480,358   $  321,095
                                                ----------   ----------   ----------
 
 
FEDERAL INCOME TAX           (Note 6)
- ------------------
  Current                                       $  191,000   $   47,000   $      -0-
  Deferred                                             -0-          -0-          -0-
                                                ----------   ----------   ----------
 
    Total Federal Income
     Tax                                        $  191,000   $   47,000   $      -0-
                                                ----------   ----------   ----------
 
    NET INCOME BEFORE
      MINORITY INTEREST                         $  748,285   $  433,358   $  321,095
                                                ----------   ----------   ----------
 
    NET INCOME ATTRIBUTABLE
      TO MINORITY INTEREST                      $    2,809   $    2,100   $    1,981
                                                ----------   ----------   ----------
 
    NET INCOME (LOSS)                           $  745,476   $  431,258   $  319,114
                                                ==========   ==========   ==========
 
    EARNINGS PER SHARE       (Note 1)           $     3.68   $     2.05   $     1.52
                                                ==========   ==========   ==========
 
</TABLE>

The accompanying notes are an integral part of this statement.

                                      F-5
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

           CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY
           ----------------------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990
<TABLE>
<CAPTION>
 

                                                                           UNREALIZED             
                                                                            LOSS ON               
                                                               RETAINED    INVESTMENTS            
                         COMMON                   TREASURY     EARNINGS     IN MUTUAL             
                         STOCK      SURPLUS        STOCK       (DEFICIT)     FUNDS        TOTAL   
                      -----------  -----------   ----------   ----------   ----------     ----- 
<S>                   <C>          <C>           <C>          <C>          <C>          <C> 
BALANCE,
 12-31-89             $   105,135   $4,660,218   $ (3,825)    $(148,455)   (288,005)   $4,325,068
 
Dividends
 $ .25/share                                      (52,568)                                (52,568)
Unrealized
 appreciation on
 investment in
 mutual funds 
 (Note 2)                                         (55,453)                  (55,453)
Loss realized on
 sale of mutual
 funds                                                                       46,639        46,639
Net income                                                      319,114                   319,114
                      -----------   ---------- ----------    ----------    ---------    ---------
 
BALANCE,
 12-31-90            $    105,135   $4,660,218    $(3,825)   $  118,091    $(296,819)  $4,582,800
 
Dividends
 $ .25/share                                                    (52,542)                  (52,542)
Unrealized
 appreciation on
 investment in
 mutual funds 
 (Note 2)                                                         4,297                     4,297
Loss realized on
 sale of mutual
 funds                                                                       121,842      121,842
Net income                                                      431,258                   431,258
                      -----------   ---------- ----------    ----------    ---------    ---------
 
BALANCE,
 12-31-91             $   105,135   $4,660,218    $(3,825)   $  496,807    $(170,680)  $5,087,655
 
Dividends
 $. 25/share                                                    (52,533)                  (52,533)
Unrealized
 depreciation on
 investment in
 mutual funds 
 (Note 2)                                                       (37,009)                  (37,009)
Loss realized on
 sale of mutual
 funds                                                           85,141                    85,141
Purchase of 8,515
 shares of stock for
 the treasury                                    (122,531)                               (122,531)
Net income                                                      745,476                   745,476
                      -----------   ----------   ----------  ----------    ----------   ---------
 
BALANCE,
 12-31-92             $   105,135   $4,660,218   $ (126,356) $ 1,189,750   $ (122,548)  $5,706,199
                      ===========   ==========   ==========  ===========   ==========   ==========
</TABLE>

The accompanying notes are an integral part of this statement.

                                      F-6
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                     -------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990
<TABLE>
<CAPTION>
 
 
                                        1992           1991           1990
                                    ------------   ------------   ------------
 <S>                                 <C>             <C>            <C>
CASH FLOWS FROM OPERATING
 ACTIVITIES:
 
  Interest received from:
    Loans                            $ 3,972,863    $ 4,010,129    $ 4,270,969
    Investment securities              2,041,812      2,255,816      2,133,031
    Federal funds sold                   119,555        215,081        187,083
  Rental income                           88,717         96,162         61,956
  Service fees                           630,855        552,500        475,356
  Other income                           434,798        266,693        213,876
  Interest paid to depositors         (2,783,267)    (3,539,487)    (3,895,189)
  Interest paid on Federal funds
   purchased                              (2,933)        (5,081)       (10,417)
  Interest paid on mortgage
   indebtedness                         (100,353)      (117,970)      (149,395)
  Cash paid to suppliers and
   employees                          (2,926,346)    (2,662,218)    (2,427,895)
  Recoveries of bad debts                 27,336          9,968         96,676
  Redemption of cash value of life
   insurance                             238,274            -0-            -0-
  Federal income tax paid                (56,142)           -0-            -0-
                                     -----------    -----------    -----------
 
  Net cash provided by operating
   activities                        $ 1,685,169    $ 1,081,593    $   956,051
                                     -----------    -----------    -----------
 
CASH FLOWS FROM INVESTING
 ACTIVITIES:
    Proceeds from sales of
     investment securities            $1,060,075     $3,995,054     $  402,072
    Proceeds from maturities of
     investment securities             8,387,673      2,992,816      6,356,985
    Purchase of investment
     securities                      (14,851,183)   (12,975,169)    (7,625,944)
    Federal funds sold, net              350,000      2,200,000      1,028,000
    Federal funds purchased, net         (85,000)        80,000         15,000
    Net (increase) in loans made
     to customers                     (4,050,974)    (4,936,416)    (2,079,275)
    Purchase of fixed assets            (157,242)       (54,370)       (10,925)
    Proceeds from sale of other
     assets and other real estate
     owned                               252,828        394,749        282,672
    Cost incurred on other real
     estate owned                       (128,205)           -0-            -0-
                                     -----------    -----------    -----------
 
    Net cash used in investing
     activities                      $(9,222,028)   $(8,303,336)   $(1,631,415)
                                     -----------    -----------    -----------
 
CASH FLOWS FROM FINANCING
 ACTIVITIES:
    Net increase in demand
     deposits,
      NOW accounts and savings
       accounts                      $ 8,357,623    $ 1,806,699    $   601,980
    Net increase (decrease) in
     time deposits                      (927,180)     6,322,734       (183,386)
    Payments on mortgage
     indebtedness                        (60,837)      (132,001)       (70,576)
    Dividends paid                       (52,542)       (52,568)       (52,568)
    Cash received on refinance of
     note payable                        132,379            -0-            -0-
    Cash paid for treasury stock        (122,531)           -0-            -0-
                                     -----------    -----------    -----------
 
    Net cash provided by financing
     activities                      $ 7,326,912    $ 7,944,864    $   295,450
                                     -----------    -----------    -----------
 
Net increase (decrease) in cash
 and cash equivalents                $  (209,947)   $   723,121    $  (379,914)
Cash and cash equivalents,
 beginning of year                     4,957,032      4,233,911      4,613,825
                                     -----------    -----------    -----------
 
Cash and cash equivalents, end of
 year                                $ 4,747,085    $ 4,957,032    $ 4,233,911
                                     ===========    ===========    ===========
</TABLE>

The accompanying notes are an integral part of this statement.

                                      F-7
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                     -------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990
<TABLE>
<CAPTION>
 
 
                                              1992         1991         1990
                                           -----------  -----------  ----------
<S>                                        <C>          <C>          <C>
RECONCILIATION OF NET INCOME
  TO NET CASH PROVIDED
  BY OPERATING ACTIVITIES:
 
  Net income                               $  745,476   $  431,258    $319,114
                                           ----------   ----------    --------
  Adjustments to reconcile net income to
   net cash provided by operating
   activities:              
 
   Depreciation and amortization           $  135,910   $  127,431    $149,069
   Amortization of construction period
    interest                                   10,219       10,219      10,219
   Amortization of intangibles                  4,000        4,000       4,000
   Provision for loan losses                  205,000      120,000     195,000
   Loss on sale of investment
    securities                                 85,405        4,495      48,738
   Loss on sale of assets                       9,939       57,072      (6,578)
   Amortization of loan premium                   -0-          -0-       3,027
   Amortization of capitalized loan
    fees                                      131,505      126,083     124,257
   Accretion of bond discount                 (39,825)     (26,409)    (28,606)
   Amortization of bond premium               296,180       44,487      19,328
   Recoveries on bad debts                     27,336        9,968      96,676
   Capitalized net loan costs                (155,419)    (134,263)   (139,891)
   Charge-offs - other real estate
    owned and other assets                    113,648      184,290     150,133
   Net income attributable to minority
    interest                                    2,809        2,100       1,981
   (Increase) decrease in interest
    receivable                                (77,787)      31,820      34,608
   (Increase) decrease in other assets        170,773      (41,359)    (60,725)
   Increase (decrease) in interest
    payable                                   (99,012)      11,497     (27,258)
   Increase (decrease) in other
    liabilities                               (15,846)     118,904      62,959
   Increase in federal income tax
    payable                                   134,858          -0-         -0-
                                           ----------   ----------    --------
 
    Total adjustments                      $  939,693   $  650,335    $636,937
                                           ----------   ----------    --------
 
Net cash provided by operating activities  $1,685,169   $1,081,593    $956,051
                                           ==========   ==========    ========

</TABLE>

The accompanying notes are an integral part of this statement.

                                      F-8
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990


NOTE 1:  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

 Significant accounting policies adopted by Concho Bancshares, Inc., the
 Company, are summarized below.

 Consolidation - The consolidated financial statements include Concho
 -------------                                                       
 Bancshares, Inc. and its subsidiary, Southwest Bank of San Angelo, after
 elimination of significant intercompany accounts.  A consolidated federal
 income tax return is filed with Concho Bancshares, Inc.'s subsidiary, Southwest
 Bank of San Angelo.  Concho Bancshares, Inc. owns 99.69% of the outstanding
 common stock of Southwest Bank of San Angelo.

 Cash flows - For purposes of reporting cash flows, cash and cash equivalents
 ----------                                                                  
 include cash on hand and amounts due from banks.  Cash flows from loans, demand
 deposits, NOW accounts, savings accounts, federal funds purchased and sold, and
 certificates of deposit, are reported net.

 Investment securities - Securities held for investment, other than mutual
 ---------------------                                                    
 funds, are stated at cost, adjusted for amortization of premiums and accretion
 of discounts computed on the straight-line method over the period from date of
 purchase to date of maturity.  This method does not result in amounts that are
 materially different from that required by generally accepted accounting
 principles.  The investment in mutual funds is stated at the lower of aggregate
 cost or market as of the balance sheet date.

 Interest income on loans - Interest on commercial, real estate and student
 ------------------------                                                  
 loans is recognized as earned based upon the principal amounts outstanding. 
 Interest on installment loans is recognized as earned based on the rule of
 seventy-eights method.

 Building and equipment - Building and equipment are stated at cost less
 ----------------------                                                 
 accumulated depreciation computed by the straight-line and accelerated cost
 recovery system methods. Accumulated depreciation as of December 31, 1992 and
 1991 is $ 2,075,690 and $ 1,930,523, respectively.  Maintenance and repairs are
 charged to expense as incurred while improvements are capitalized and
 depreciated over the useful life of such improvements.

 Allowance for loan losses - The allowance for loan losses is available for
 -------------------------                                                 
 losses incurred on loans and is increased by provisions charged to operating
 expenses and reduced by charge-offs, net of recoveries.  The allowance is based
 on management's evaluation of the adequacy of the reserve.  This evaluation
 encompasses consideration of past loss experience and other factors, including
 changes in the composition and volume of the portfolio, the relationship of the
 allowance to the portfolio, and current economic conditions.

                                      F-9
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990



NOTE 1:  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

 Amortization - Certain costs associated with the Company's investment services
 ------------                                                                  
 have been capitalized and are being amortized by the straight-line method over
 a period of 60 months. Total amortization expense for 1992, 1991 and 1990 was
 $ 4,000 each year.

 Per Share Data - Earnings per share are based on the weighted average number of
 --------------                                                                 
 common shares outstanding in 1992, 1991 and 1990 of 202,387, 210,168 and
 210,168, respectively.

NOTE 2:  INVESTMENT SECURITIES

 At December 31, 1992 and 1991 the subsidiary held mutual fund investments with
 a cost basis of $ 964,843 and $ 1,897,269, respectively.  The portfolios of
 these mutual funds consisted of obligations of the United States government and
 agencies.  As of December 31, 1992 and 1991, the aggregate cost of mutual fund
 investments exceeded their aggregate market value by $ 122,927 and $ 171,297
 respectively.

 Investment securities shown in the balance sheet are reflected net of
 accumulated accretion and amortization.

 At December 31, 1992 and 1991, the amortized cost, estimated market values, and
 the gross unrealized gains and losses of investments in debt securities were as
 follows:
<TABLE>
<CAPTION>
 
                                              December 31, 1992
                              -------------------------------------------------
                                             Gross       Gross       Estimated
                               Amortized   Unrealized  Unrealized     Market
                                 Cost        Gains       Losses        Value
                              -----------  ----------  -----------  -----------
 
<S>                           <C>          <C>         <C>          <C>
United States government      $17,511,071    $277,758   $(25,073)   $17,763,756
United States agencies         12,211,810     352,867    (58,156)    12,506,521
Collateralized mortgage
 obligation                     2,938,724      84,839    (91,733)     2,931,830
Corporate bonds and notes             -0-         -0-        -0-            -0-
                              -----------    --------  ----------   -----------
 
Total debt securities         $32,661,605    $715,464  $ (174,962)  $33,202,107
                              ===========    ========  ==========   ===========
</TABLE>
                                   Continued

                                      F-10
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990


NOTE 2:  INVESTMENT SECURITIES (CONTINUED)

     The carrying value and approximate market value of debt securities at
     December 31, 1992, by contractual maturity, are shown below.  Expected
     maturities will differ from contractual maturities because borrowers may
     have the right to call or prepay obligations with or without call or
     prepayment penalties.

<TABLE>
<CAPTION>
 
                                                         Carrying          Approximate
                                                          Value           Market Value
                                                        -----------       ------------
   <S>                                                  <C>               <C>          
  Due in one year or less                               $ 2,545,483       $ 2,575,470
  Due after one year through five years                  18,181,825        18,392,451
  Due after five years through ten years                        -0-               -0-
  Due after ten years                                    11,934,297        12,234,186
                                                        -----------       -----------
                                                        $32,661,605       $33,202,107
                                                        ===========       ===========
 
</TABLE> 

<TABLE> 
<CAPTION>  
                                                                December 31, 1991
                                           ----------------------------------------------------------
                                                           Gross               Gross       Estimated
                                            Amortized    Unrealized          Unrealized      Market
                                              Cost         Gains              Losses         Value
                                           -----------  -----------        ------------   -----------  
<S>                                        <C>          <C>                <C>            <C> 
United States government                   $ 5,100,869  $   151,602        $      -0-    $ 5,252,471
United States agencies                      13,320,280      540,340           (10,220)    13,850,400
Collateralized mortgage obligation           8,249,479      141,603           (62,403)     8,328,679
Corporate bonds and notes                      300,215        8,035               -0-        308,250
                                           -----------  -----------        ----------    -----------
Total debt securities                      $26,970,843  $   841,580        $  (72,623)   $27,739,800
                                           ===========  ===========        ==========    ===========
 
</TABLE>

                                   Continued

                                      F-11
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990


NOTE 2:  INVESTMENT SECURITIES (CONTINUED)

     The carrying value and approximate market value of debt securities at
     December 31, 1991, by contractual maturity, are shown below.  Expected
     maturities will differ from contractual maturities because borrowers may
     have the right to call or prepay obligations with or without call or
     prepayment penalties.
<TABLE>
<CAPTION>
 
 
                                            Carrying    Approximate
                                              Value     Market Value
                                           -----------  ------------
<S>                                        <C>          <C>
Due in one year or less                    $   300,215   $   308,250
Due after one year through five years        6,583,200     6,760,060
Due after five years through ten years         504,339       512,538
Due after ten years                         19,583,089    20,158,952
                                           -----------   -----------
 
                                           $26,970,843   $27,739,800
                                           ===========   ===========
</TABLE>
     Obligations of the United States government with par values of $ 3,000,000,
     were pledged to secure various deposits as of December 31, 1992 and 1991.


NOTE 3:  PENSION AND PROFIT SHARING PLANS

     The subsidiary has a non-contributory profit-sharing plan available to all
     regular employees who have completed six months of service.  Contributions
     to this plan are at the discretion of the subsidiary's board of directors. 
     The subsidiary also sponsors a defined contribution plan, whereby it
     matches 100% of employee contributions up to 4% of their compensation and
     50% of contributions on the next 2% of compensation.  Total expense,
     relating to the defined contribution plan for the years ended December 31,
     1992, 1991 and 1990 was $ 42,154, $ 33,967 and $ 34,824, respectively and
     are included in employee benefits in the consolidated statements of 
     income.  For the year ended December 31, 1992 the subsidiary's board of
     directors elected to contribute $ 25,000 to the profit sharing plan.
     Administrative fees of the plans are paid by the subsidiary.  Employer
     contributions of both plans vest  according to the following schedule:
<TABLE> 
<CAPTION> 
                    LENGTH OF SERVICE     VESTING 
                    -----------------     ------- 
                         <S>                <C>   
                         2 years            20%   
                         3 years            30%   
                         4 years            40%   
                         5 years            60%   
                         6 years            80%   
                         7 years           100%    
</TABLE> 

                                      F-12
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990


NOTE 4:  LOANS AND ALLOWANCE FOR LOAN LOSSES

<TABLE> 
<CAPTION> 
     Major classifications of loans are as follows:
 
                                                  December 31,  December 31,
                                                      1992          1991    
                                                  ------------  ------------
                                                               
       <S>                                         <C>           <C>
       Commercial, financial and agricultural      $32,561,474   $26,479,060
       Real estate                                   4,162,896     5,659,592
       Installment, net of unearned discount         3,821,648     4,825,862
       Student loans                                 4,101,729     3,314,090
       Overdrafts                                       28,742        26,198
       Participations sold                          (1,481,150)     (599,829)
                                                   -----------   -----------
                                                               
       Total loans, net of unearned discount       $43,195,339   $39,704,973
                                                               
       Less allowance for loan losses                  598,734       547,354
                                                   -----------   -----------
                                                               
       NET LOANS                                   $42,596,605   $39,157,619
                                                   ===========   ===========
                                                               
     Non-accrual loans are as follows:                         
                                                               
       Principal balances of loans on                          
         non-accrual status                        $   638,371   $   864,346
                                                   ===========   ===========
                                                               
       Approximate interest foregone related to                
         non-accrual loans                         $    68,000   $    66,000
                                                   ===========   ===========
</TABLE> 

     Changes in the allowance for loan losses were as follows:

<TABLE>
<CAPTION>
                                    December 31,   December 31,   December 31,
                                        1992           1991           1990    
                                    ------------   ------------   ------------
<S>                                 <C>            <C>            <C>
BALANCE, BEGINNING OF YEAR          $    547,354   $    510,017   $    512,131
Provision charged to operations          205,000        120,000        195,000
Loans charged off                       (180,956)       (92,631)      (293,790)
Recoveries                                27,336          9,968         96,676
                                    ------------   ------------   ------------
                                     
BALANCE, END OF YEAR                $    598,734   $    547,354   $    510,017
                                    ============   ============   ============
</TABLE>

                                      F-13
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990


NOTE 4:  LOANS AND ALLOWANCE FOR LOAN LOSSES (CONTINUED)

     During the year ended December 31, 1988, the subsidiary changed its method
     of accounting for nonrefundable fees and costs associated with lending
     activities to comply with the requirements of Statement of Financial
     Accounting Standards No. 91.  Under the new accounting method, certain
     lending related costs are capitalized into the loan balance and amortized
     against interest income over the term of the loan.  Total capitalized loan
     cost and related amortization are as follows:

<TABLE>
<CAPTION>
                        Beginning of                               End of
                         the Year                                 the Year
                        Unamortized   Capitalized                Unamortized
                        Loan Costs    Loan Costs   Amortization  Loan Costs
                        ------------  -----------  ------------  -----------
     <S>                <C>           <C>          <C>           <C>
     1992                $ 156,576     $155,419     $ 131,534    $ 180,461
                         =========     ========     =========    =========
                                                                 
     1991                $ 148,396     $134,263     $ 126,083    $ 156,576
                         =========     ========     =========    =========
                                                                 
     1990                $ 132,762     $139,891     $ 124,257    $ 148,396
                         =========     ========     =========    =========
</TABLE> 
 
     Loans, net of participations sold, at variable and fixed interest rates 
     as of December 31, 1992 are as follows:
 
<TABLE> 
<CAPTION> 
                                           Variable             Fixed
                                          -----------        -----------
     <S>                                  <C>                <C>  
     Commercial, including overdrafts     $14,807,576        $16,383,126
                                          ===========        ===========
                                                           
     Real estate                          $ 1,445,205        $ 2,636,055
                                          ===========        ===========
                                                           
     Installment                          $   428,414        $ 3,393,234
                                          ===========        ===========
                                                           
     Student                              $       -0-        $ 4,101,729
                                          ===========        ===========
</TABLE> 

     Original maturities for each loan category as of December 31, 1992 are as
     follows:
 
        Commercial  - less than 1 year to 30 years
 
        Real estate - 1 year to 30 years

        Installment - less than 1 year to 10 years

        Student     - 1 to 2 years

                                      F-14
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990



NOTE 4:  LOANS AND ALLOWANCE FOR LOAN LOSSES (CONTINUED)

     The subsidiary routinely sells its student loans to the Panhandle Plains
     Higher Education Agency prior to the loans reaching repayment stage.  These
     loans are sold at face value. For 1992, 1991 and 1990, the subsidiary sold
     approximately $ 2,351,013, $ 2,619,000 and $ 2,038,000, respectively, of
     these loans under this program.


NOTE 5:  LAND, BUILDING AND EQUIPMENT

     Major classifications of these assets are as follows:

<TABLE>
<CAPTION>
                            December 31,     December 31,     December 31,
                                1992             1991             1990
                            ------------     ------------     ------------
<S>                         <C>              <C>              <C>
Land                         $  327,000       $  327,000       $  327,000
Buildings                     3,711,293        3,691,363        3,688,863
Leasehold improvements          145,077          145,077          141,877
Automobiles                      58,528           31,895           14,316
Furniture and fixtures          743,263          691,939          675,163
Assets not in service            58,393              -0-              -0-
                             ----------       ----------       ----------
                                                             
                             $5,043,554       $4,887,274       $4,847,219
                                                             
Accumulated depreciation                                
 and amortization            $2,075,690       $1,930,523       $1,804,829
                             ----------       ----------       ----------
 
Land, building and 
equipment, net               $2,967,864       $2,956,751       $3,042,390
                             ==========       ==========       ==========
 
Depreciation and 
amortization
 expense                     $  146,129       $  137,650       $  159,288
                             ==========       ==========       ==========
</TABLE>

NOTE 6:  FEDERAL INCOME TAXES

     Deferred income taxes arise from timing differences resulting from income
     and expense items reported for financial accounting and tax purposes in
     different periods.  The principal sources of timing differences are
     different depreciation methods for tax and financial purposes, and
     differences in tax and financial accounting for deferred compensation
     arrangements, bad debt losses and bond discount accretion.  No deferred
     federal income taxes have been recorded in these financial statements.

                                      F-15
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990



NOTE 6:  FEDERAL INCOME TAXES (CONTINUED)

     The components of income tax expense are:

<TABLE>
<CAPTION>
                               December 31,   December 31,   December 31,
                                   1992           1991           1990    
                               ------------   ------------   ------------ 
  <S>                          <C>            <C>            <C>
  Current income taxes:       
    Federal                     $  251,629      $  56,357        $   -0-
    Minimum tax credit             (12,050)           -0-            -0-
    General business credit        (48,579)        (9,357)           -0-
                                ----------      ---------        -------
  Total current taxes           $  191,000      $  47,000        $   -0-
                                ----------      ---------        -------
                            
  Deferred tax expense        
    (benefit):                  $      -0-      $     -0-        $   -0-
                                ----------      ---------        -------
                            
  Total income tax expense      $  191,000      $  47,000        $   -0-
                                ==========      =========        =======
</TABLE>

     A reconciliation of income tax expense at the statutory rate to income tax
     at the bank's effective rate is as follows:

<TABLE>
<CAPTION>
                               December 31,   December 31,   December 31,
                                   1992           1991           1990    
                               ------------   ------------   ------------ 
  <S>                          <C>            <C>            <C>
  Tax at statutory rate         $  319,356     $  164,469     $  108,477
  Tax benefit from net          
    operating loss               
    carryforward                   (67,727)      (164,469)      (108,477)
  Minimum tax credit               (12,050)           -0-            -0-
  Tax on limitation of use of   
    net operating loss           
    carryforward for             
    alternative minimum tax      
    purposes                           -0-         56,357            -0-
  General business credit          (48,579)        (9,357)           -0-
                                ----------     ----------     ----------
                                
  Income tax expense            $  191,000     $   47,000     $      -0-
                                ==========     ==========     ==========
</TABLE>

                                      F-16
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990



NOTE 6:  FEDERAL INCOME TAXES (CONTINUED)

     A consolidated tax return is filed with the Company's subsidiary, Southwest
     Bank of San Angelo.  The above tax computations are based on the incomes
     and tax attributes of the consolidated entity.

     The consolidated entity has available at December 31, 1992, 1991 and 1990,
     unused net operating loss carryforwards of $ -0-, $ 133,500 and $ 749,908,
     respectively, which may be applied against future taxable income.  These
     net operating loss carryforwards will expire as follows:

<TABLE>
<CAPTION>
              Year of           December 31,     December 31,     December 31,
            Expiration              1992             1991             1990    
            ----------          ------------     ------------     ------------ 
            <S>                 <C>              <C>              <C>
               1991             $        -0-     $        -0-     $     96,107
               1999                      -0-              -0-           55,649
               2000                      -0-              -0-          181,303
               2001                      -0-              -0-          142,707
               2002                      -0-              -0-           25,175
               2004                      -0-          133,500          248,967
</TABLE>

     Investment tax credit resulting from the purchase of equipment is accounted
     for using the "flow-through" method, which recognizes the benefit in the
     period in which the assets which give rise to the credit are placed in
     service.  At December 31, 1992, 1991 and 1990, unused investment tax
     credits totalling $ -0-, $ 26,032 and $ 37,009, respectively, were
     available for carryforward which expire as follows:

<TABLE>
<CAPTION>
              Year of
            Expiration              1992             1991             1990    
            ----------          ------------     ------------     ------------ 
            <S>                 <C>              <C>              <C> 
               1991             $        -0-     $        -0-     $        183
               1992                      -0-              -0-              277
               1993                      -0-              -0-            8,116
               1994                      -0-              -0-            1,591
               1995                      -0-            2,853            3,663
               1996                      -0-            8,105            8,105
               1997                      -0-            8,000            8,000
               1998                      -0-            5,487            5,487
               1999                      -0-              745              745
               2000                      -0-              842              842
</TABLE>

                                      F-17
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990



NOTE 6:  FEDERAL INCOME TAXES (CONTINUED)

     As of December 31, 1992 , 1991 and 1990, the Company has available for
     carryforward jobs tax credits of $ -0-, $ 20,927 and $ 20,927,
     respectively, which expire as follows:

<TABLE>
<CAPTION>
            Year of                   
           Expiration               1992          1991            1990
           ----------              ------       ---------       ---------
           <S>                     <C>          <C>             <C>
              1992                 $  -0-       $  13,474       $  13,474
              1993                    -0-           7,453           7,453
</TABLE>

NOTE 7:  FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK

     The subsidiary is a party to financial instruments with off-balance-sheet
     risk in the normal course of business to meet the financing needs of its
     customers.  These financial instruments include commitments to extend
     credit and letters of credit.  Those instruments involve elements of credit
     risk in excess of the amount recognized in the balance sheet.  The contract
     amounts of those instruments reflect the extent of involvement the
     subsidiary has in particular classes of financial instruments.

     The subsidiary's exposure to credit loss in the event of nonperformance by
     the other party to the financial instruments for commitments to extend
     credit and letters of credit is represented by the contractual amount of
     those instruments.  The subsidiary uses the same credit policies in making
     commitments and conditional obligations as it does for on-balance-sheet
     instruments.

<TABLE>
<CAPTION>
                                                           Contract
                                                            Amount
                                                          ----------
     <S>                                                  <C>
     Financial instruments whose contract               
       amounts represent credit risk:                   
     Commitments to extend credit                         $4,740,485
     Letters of Credit                                       726,980
                                                          ----------
                                                        
                                                          $5,467,465
                                                          ==========
</TABLE>

     Commitments to extend credit are agreements to lend to a customer as long
     as there is no violation of any condition established in the contract. 
     Commitments may expire without being drawn upon; therefore, the total
     commitment amounts do not necessarily represent future cash requirements. 
     The subsidiary evaluates each customer's creditworthiness on a case by case
     basis.  The amount of collateral obtained if deemed necessary by the
     subsidiary upon extension of credit is based upon management's credit
     evaluation.

                                      F-18
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990



NOTE 7:  FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET
     RISK (CONTINUED)

     Letters of credit are conditional commitments issued by the bank to
     guarantee the performance of a customer to a third party.  The credit risk
     involved in issuing letters of credit is essentially the same as that
     involved in extending loan facilities to customers.

NOTE 8:  DEFERRED COMPENSATION

     The subsidiary maintains a deferred compensation plan for its directors
     funded by the purchase of life insurance policies on each participant. 
     Other pertinent financial information relating to the subsidiary's deferred
     compensation plans is as follows:

<TABLE>
<CAPTION>
                                       December 31,  December 31,  December 31,
                                           1992          1991          1990
                                       ------------  ------------  ------------
        <S>                            <C>           <C>           <C>
        Life insurance premiums paid   $      5,600  $      4,400  $      4,800
                                       ============  ============  ============
                                       
        Cash surrender value of life   
         insurance policies            $    244,957  $    407,863  $    369,599
                                       ============  ============  ============
                                       
        Accrued deferred compensation  
         liability                     $    100,548  $    107,235  $     78,383
                                       ============  ============  ============
                                       
        Current year deferred          
         compensation expense          $     22,744  $     28,852  $     25,559
                                       ============  ============  ============
</TABLE>

     The deferred compensation plan of a former director was discontinued during
     1992.  The subsidiary recognized a gain of $ 67,514 from the discontinuance
     of this director's plan.

NOTE 9:  RELATED PARTY TRANSACTIONS

     As of December 31, 1992 and 1991, certain officers and directors and
     companies in which they have a beneficial ownership were indebted to the
     subsidiary in the aggregate amount of $ 789,332 and $ 1,191,456,
     respectively.  On January 21, 1992, the company issued notes to certain
     customers and directors that are more fully described in Note 10.

                                      F-19
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990



NOTE 10:  NOTES PAYABLE

     Notes payable at December 31, 1992 represents 13 individual promissory
     notes issued to certain of the company's customers and directors.  Each
     note was issued for $ 100,000 and all notes bear the same terms, maturity
     date and collateral.  The collateral for these notes is held at Bank of the
     West, San Angelo, Texas.  The terms of these notes are as follows:

<TABLE>
     <S>                            <C>
     Date of notes                  January 21, 1992
     Maturity date                  January 21, 1997
     Collateral                     Real Estate and 119,504
                                    shares of Southwest Bank
                                    common stock
     Interest rate                  9.50%
     Payments                       19 quarterly payments of
                                    $ 50,702.86, including
                                    interest beginning April 21, 1992;
                                    balance due at maturity.
</TABLE>

     Following are the maturities of this note over the next five years:

<TABLE>
     <S>                            <C>      
     1993                           $   88,178
     1994                               96,857
     1995                              106,392
     1996                              116,865
     1997                              830,872
                                    ----------
           
     Total                          $1,239,164
                                    ==========
</TABLE>

     The mortgage payable at December 31, 1991 represents a note payable to a
     local financial institution.  The terms of this note are as follows:

<TABLE>
     <S>                            <C> 
     Date of note                   June 1, 1989
     Maturity date                  May 1, 1992
     Collateral                     Real Estate
     Interest rate                  CNB prime, not to exceed 12%
     Monthly payment                $ 15,414 (principal and interest)
</TABLE> 

 Following are the maturities of this note over the next five years:

<TABLE> 
     <S>                            <C> 
     1992                           $1,167,622
                                    ==========
     Total                          $1,167,622
                                    ==========
</TABLE>

                                      F-20
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990


NOTE 11:  RETAINED EARNINGS

     Banking regulations limit the amount of dividends that may be paid without
     prior approval of the Bank's regulatory agency.


NOTE 12:  LEASES

     The subsidiary leases computer equipment and an automobile under four
     agreements determined to be operating leases.  The provisions of these
     lease agreements are described as follows:

<TABLE>
<CAPTION>
                                                                     Computer
                                   Computer   Computer               Equipment
                                   Equipment  Equipment              ---------
                                      #1         #2      Automobile      #3
                                   ---------  ---------  ----------  ---------
     <S>                           <C>        <C>        <C>         <C> 
     Primary lease term               36 mos     36 mos      30 mos     36 mos
                              
     Date of lease                  12-27-89   08-23-89    10-04-89   01-29-90
                              
     Lease renewal option at       
      expiration of primary term      24 mos     24 mos      18 mos     24 mos
                              
                              
     Primary term:                 
                              
       Year one                    $   5,664  $   1,950   $     531  $     345
       Year two                        6,231      2,145         531        380
       Year three                      6,854      2,359         531        418
                              
     Option period:                
                              
       Year one                        7,539      2,595         531        459
       Year two                        8,141      2,846         531        467
                              
     Penalty for non-renewal          18,626      6,430         -0-      1,136
</TABLE>

     Minimum future rental payments under the primary and optional terms of
     these lease agreements as of December 31, 1992, 1991 and 1990 for each of
     the next five years and in the aggregate are as follows:

                                      F-21
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990


NOTE 12:  LEASES (CONTINUED)

<TABLE>
<CAPTION>
                                             1992        1991        1990  
                                           --------    --------    --------
        <S>                               <C>         <C>         <C>       
        1991                              $     -0-   $     -0-   $ 113,101
        1992                                    -0-      98,478      98,478
        1993                                122,596         418         418
        1994                                117,012         -0-         -0-
        1995                                  8,141         -0-         -0-
                                          ---------   ---------   ---------
                                                                
        Total                             $ 247,749   $  98,896   $ 211,997
                                          =========   =========   =========
</TABLE> 
 
     Lease expense under all operating leases is as follows:

<TABLE> 
<CAPTION> 
                                             1992        1991        1990  
                                           --------    --------    --------
        <S>                               <C>         <C>         <C>       
        Non-cancelable operating leases   $  98,478   $ 113,101   $ 110,843
        Other leases                         41,008      24,027      16,667
                                          ---------   ---------   ---------
 
        Total                             $ 139,486   $ 137,128   $ 127,510
                                          =========   =========   =========
</TABLE>

     The primary terms of the automobile lease expired during 1992.  The
     Subsidiary did not elect to extend the term of the automobile lease. 
     Computer equipment leases #1 and #2 were extended to the optional periods
     during 1992.

     Other leases are agreements under which the subsidiary leases certain
     equipment.  The terms of these agreements do not extend for more than one
     year from the balance sheet date or they are cancelable at the option of
     the lessee.


NOTE 13:  CHANGE OF ACCOUNTING PRINCIPLE

     In February 1992, the Financial Accounting Standards Board adopted
     Statement of Financial Accounting Standards No. 109, Accounting for Income
                                                          ---------------------
     Taxes, which supersedes substantially all existing authoritative literature
     -----                                                                      
     for accounting for income taxes and requires deferred tax balances to be
     adjusted to reflect the tax rates in effect when those amounts are expected
     to become payable or refundable.  The Statement is required to be applied
     in the Company's 1993 financial statements (earlier application is
     permitted), either by restating prior-period financial statements or by
     recognizing the cumulative effect of the change in the year of adoption. 
     The Company plans to recognize the cumulative effect of the change in 1993
     when it adopts the Statement.  The Company would have a deferred income tax
     liability of $ 189,417 under the measurement principles of SFAS No. 109.

                                      F-22
<PAGE>

                     CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990


NOTE 14:  FAIR VALUE OF FINANCIAL INSTRUMENTS

     Statement of Financial Accounting Standards No. 107, "Disclosures about
     Fair Value of Financial Instruments", requires all entities to disclose the
     estimated fair value of its financial instrument assets and liabilities. 
     For the Company, as for most financial institutions, approximately 95% of
     its assets and 99% of its liabilities are considered financial instruments
     as defined in Statement No. 107.  Many of the Company's financial
     instruments, however, lack an available trading market as characterized by
     a willing buyer and willing seller engaging in an exchange transaction.  It
     is also the Company's general practice and intent to hold its financial
     instruments to maturity and to not engage in trading or sales activities. 
     Therefore, significant estimations and present value calculations were used
     by the Company for the purpose of this disclosure.

     Estimated fair values have been determined by the Company using the best
     available data, as generally provided in the Company's Regulatory Reports,
     and an estimation methodology suitable for each category of financial
     instruments.  For those loans and deposits with floating interest rates, it
     is presumed that estimated fair values generally approximate the recorded
     book balances.  The estimation methodologies used, the estimated fair
     values, and recorded book balances at December 31, 1992, were as follows:

     *Financial instruments actively traded in a secondary market have been
     valued using quoted available market prices.

<TABLE>
<CAPTION>
                                            ESTIMATED        RECORDED 
                                               FAIR            BOOK   
                                              VALUE          BALANCE  
                                           -----------      ----------
     <S>                                   <C>             <C>         
     Cash and due from banks               $ 4,747,085     $ 4,747,085
     Federal funds sold                      2,550,000       2,550,000
     Investment securities (Note 2)         34,347,360      33,806,858
</TABLE>

     *Financial instruments with stated maturities have been valued using a
     present value discounted cash flow with a discount rate approximating
     current market for similar assets and liabilities.  Financial instrument
     assets with variable rates and financial instrument liabilities with no
     stated maturities have an estimated fair value equal to both the amount
     payable on demand and the recorded book balance.

<TABLE>
<CAPTION>
                                             ESTIMATED        RECORDED 
                                                FAIR            BOOK   
                                               VALUE          BALANCE  
                                            -----------      ----------
     <S>                                   <C>             <C>         
     Deposits with stated maturities       $ 36,061,445    $ 35,906,058
     Deposits with no stated maturities      45,189,115      45,189,115
     Mortgage payable                         1,334,415       1,239,164
</TABLE>

                                      F-23
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                  YEARS ENDED DECEMBER 31, 1992, 1991 AND 1990


NOTE 14:  FAIR VALUE OF FINANCIAL INSTRUMENTS (CONTINUED)

<TABLE> 
<CAPTION> 
                                      ESTIMATED           RECORDED
                                        FAIR                BOOK
                                        VALUE              BALANCE  
                                     -----------         -----------
<S>                                  <C>                 <C> 
     Net loans                       $ 43,125,697        $ 42,596,605

</TABLE> 

     Changes in assumptions or estimation methodologies may have a material
     effect on these estimated fair values.

     The Company's remaining assets and liabilities which are not considered
     financial instruments have not been valued differently than has been
     customary with historical cost accounting.  No disclosure of the
     relationship value of the Company's deposits is required by Statement No.
     107 nor has the Company estimated its value.  There is no material
     difference between the notional amount and the estimated fair value of
     off-balance-sheet unfunded loan commitments which total $ 4,740,485 and are
     generally priced at market at the time of funding.  Letters of credit
     discussed in Note 7 have an estimated fair value based on fees currently
     charged for similar agreements.  At December 31, 1992, fees related to the
     unexpired term of the letters of credit are not significant.

     Management is concerned that reasonable comparability between financial
     institutions may not be likely due to the wide range of permitted valuation
     techniques and numerous estimates which must be made given the absence of
     active secondary markets for many of the financial instruments.  This lack
     of uniform valuation methodologies also introduces a greater degree of
     subjectivity to these estimated fair values.

                                      F-24
<PAGE>

Concho Bancshares, Inc.
San Angelo, Texas

                               COMPILATION REPORT
                               ------------------

We have compiled the accompanying consolidated balance sheets of Concho
Bancshares, Inc. and Subsidiary, as of September 30, 1993 and 1992, and the
related consolidated statements of earnings, changes in stockholders' equity and
cash flows for the nine months then ended and the consolidated statements of
earnings for the three months ended September 30, 1993 and 1992, in accordance
with the standards established by the American Institute of Certified Public
Accountants.

A compilation is limited to presenting in the form of financial statements
information that is the representation of management.  We have not audited or
reviewed the accompanying financial statements and, accordingly, do not express
an opinion or any other form of assurance on them.  However, we did become aware
of a departure from generally accepted accounting principles that is described
in the following paragraph.

Statements of cash flows for the three month periods ended September 30, 1993
and 1992 have not been presented. Generally accepted accounting principles
require a statement of cash flows to be presented for each period for which
results of operations are provided when financial statements report both
financial position and results of operations.

The balance sheet as of December 31, 1992 was audited by us as part of an audit
of Concho Bancshares, Inc's financial statements, and we expressed an
unqualified opinion on those financial statements in our report dated February
12, 1993, but we have not performed any auditing procedures since that date.






                                                 Armstrong, Backus & Co., L.L.P.

December 6, 1993

                                      F-25
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                          CONSOLIDATED BALANCE SHEETS
                          ---------------------------
<TABLE>
<CAPTION>
 
                                                                             UNAUDITED               AUDITED
                                                                   -----------------------------  -------------
                                                                           SEPTEMBER 30,          DECEMBER 31,
                                                                   -----------------------------  ------------
                                                                        1993           1992           1992
                                                                   --------------  -------------  -------------
<S>                                                                <C>             <C>            <C>
ASSETS:
  Cash and due from banks  (Note 1)                                 $  3,519,769   $  3,593,736   $  4,747,085
  Federal funds sold  (Note 1)                                         2,500,000            -0-      2,550,000
  Investment securities:  (Notes 1 & 2)
      U. S. Treasury and government agencies                          28,563,616     26,619,044     29,722,881
      Other                                                            6,231,924      5,399,085      4,083,977
                                                                    ------------   ------------   ------------
 
        Total investment securities                                 $ 34,795,540   $ 32,018,129   $ 33,806,858
 
  Loans  (Notes 1, 4, 7 & 9)                                          44,219,942     44,399,838     43,568,513
      Less:  Allowance for loan losses                                   596,602        559,411        598,734
          Unearned discount                                              259,357        382,651        373,174
                                                                    ------------   ------------   ------------
 
        Net loans                                                   $ 43,363,983   $ 43,457,776   $ 42,596,605
 
  Bank premises and equipment, net  (Notes 1, 5 & 9)                   2,837,744      2,921,942      2,967,864
  Other assets  (Note 8)                                               2,093,104      2,455,566      2,195,934
                                                                    ------------   ------------   ------------
TOTAL ASSETS                                                        $ 89,110,140   $ 84,447,149   $ 88,864,346
                                                                    ============   ============   ============
 
LIABILITIES:
  Non-interest bearing deposits  (Note 1)                           $ 12,701,741   $ 11,391,192   $ 13,002,139
  Interest bearing deposits - demand  (Note 1)                        33,933,148     29,808,496     32,186,976
  Interest bearing deposits - time  (Note 1 & 2)                      34,267,984     35,667,049     35,906,058
                                                                    ------------   ------------   ------------
 
        Total deposits                                              $ 80,902,873   $ 76,866,737   $ 81,095,173
 
  Short-term borrowings  (Note 10)                                       130,000            -0-            -0-
  Mortgage payable  (Note 10)                                          1,173,589      1,259,703      1,239,164
  Other liabilities  (Note 8)                                          1,087,074        734,626        823,810
                                                                    ------------   ------------   ------------
TOTAL LIABILITIES                                                   $ 83,293,536   $ 78,861,066   $ 83,158,147
                                                                    ------------   ------------   ------------
 
SHAREHOLDERS' EQUITY:
  Common stock, $ .50 par value; 500,000 shares
      authorized, 210,270 shares issued, 185,386,
      201,690 and 201,653 shares outstanding,
      respectively                                                  $    105,135   $    105,135   $    105,135
  Capital surplus                                                      4,660,218      4,660,218      4,660,218
  Retained earnings  (Note 11)                                         1,564,776      1,071,480      1,189,750
  Treasury stock, cost                                                  (471,216)      (125,968)      (126,356) 
  Unrealized loss on securities, net  (Note 2)                           (42,309)      (124,782)      (122,548) 
                                                                    ------------   ------------   ------------
TOTAL SHAREHOLDERS' EQUITY                                          $  5,816,604   $  5,586,083   $  5,706,199
                                                                    ------------   ------------   ------------
 
TOTAL LIABILITIES AND
    SHAREHOLDERS' EQUITY                                            $ 89,110,140   $ 84,447,149   $ 88,864,346
                                                                    ============   ============   ============
</TABLE>

See accountants' compilation report.
The accompanying notes are an integral part of this statement.

                                      F-26
<PAGE>
                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                      CONSOLIDATED STATEMENTS OF EARNINGS
                      -----------------------------------
<TABLE>
<CAPTION>
 
 
                                                                                    UNAUDITED
                                                         ------------------------------------------------------------
                                                              Three Months Ended                 Nine Months Ended
                                                                 September 30,                     September 30,
                                                         ------------------------------------------------------------
                                                             1993          1992               1993           1992
                                                         -----------    -----------       -----------      ----------
 
<S>                                                      <C>         <C>                 <C>             <C>
INTEREST INCOME: (Notes 1, 2, 4 & 9)
  Loans, including fees                                  $  992,324     $  993,549         $2,961,602     $2,958,264
  Investment income - taxable                               464,625        477,927          1,443,962      1,458,478
  Interest on federal funds sold and
   other                                                     36,392         31,183             73,847         97,100
                                                         ----------     ----------         ----------  -------------
 
    Total interest income                                $1,493,341     $1,502,659         $4,479,411     $4,513,842
                                                         ----------     ----------         ----------  -------------
 
INTEREST EXPENSE:
  Interest bearing deposits                              $  548,974     $  644,014         $1,670,440     $2,082,399
  Term and other indebtedness                 (Note 10)      30,512         30,269             88,295         89,733
                                                         ----------     ----------         ----------  -------------
 
    Total interest expense                               $  579,486     $  674,283         $1,758,735     $2,172,132
                                                         ----------     ----------         ----------  -------------
 
NET INTEREST INCOME                                      $  913,855     $  828,376         $2,720,676     $2,341,710
  Provision for loan losses               (Notes 1 & 4)      59,000         37,000            105,000         67,000
                                                         ----------     ----------         ----------  -------------
 
NET INTEREST INCOME AFTER
  PROVISION FOR LOAN LOSSES                              $  854,855     $  791,376         $2,615,676     $2,274,710
                                                         ----------     ----------         ----------  -------------
 
OTHER INCOME:
  Service fees on deposit accounts                       $  163,378     $  144,065         $  474,432     $  425,457
  Other                                                     135,365        194,442            382,648        409,340
                                                         ----------     ----------         ----------  -------------
 
    Total other income                                   $  298,743     $  338,507         $  857,080     $  834,797
                                                         ----------     ----------         ----------  -------------
 
OTHER EXPENSE:
  Salaries and employee benefits               (Note 3)  $  391,792     $  370,150         $1,155,421     $1,060,860
  Net occupancy and equipment expenses   (Notes 5 & 12)      91,220         79,998            267,186        233,579
  Equipment rentals, depreciation and
   maintenance                           (Notes 5 & 12)      55,781         64,317            176,369        182,450
  FDIC assessments                                           45,954         41,869            134,342        123,978
  Correspondent bank service charges                         16,034         14,720             44,970         42,130
  Other                                (Notes 1, 4 & 8)     230,232        222,522            740,229        666,837
                                                         ----------     ----------         ----------  -------------
 
    Total other expense                                  $  831,013     $  793,576         $2,518,517     $2,309,834
                                                         ----------     ----------         ----------  -------------
 
EARNINGS BEFORE INCOME TAXES                             $  322,585     $  336,307         $  954,239     $  799,673
  Provision for income tax                     (Note 6)     119,000        110,000            348,000        225,000
                                                         ----------     ----------         ----------  -------------
</TABLE>


See accountants' compilation report.
The accompanying notes are an integral part of this statement.

                                      F-27
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                      CONSOLIDATED STATEMENTS OF EARNINGS
                      -----------------------------------

                                  (CONTINUED)
<TABLE>
<CAPTION>
                                                            UNAUDITED
                                          ----------------------------------------------
                                           Three Months Ended        Nine Months Ended
                                              September 30,            September 30,
                                          ---------------------  -----------------------
                                             1993       1992        1993        1992
                                          ---------- ----------  ---------- ------------
<S>                                       <C>        <C>         <C>        <C>
EARNINGS BEFORE CUMULATIVE                
  ADJUSTMENT  (Note 13)                   $  203,585  $  226,307  $  606,239  $  574,673
  Cumulative adjustment - change in                             
   accounting principle                   (      -0-)        -0-  (  231,213)        -0-
                                          ----------  ----------  ----------  ----------
                                                          
NET EARNINGS AFTER CUMULATIVE                             
  ADJUSTMENT DUE TO CHANGE IN                                   
  ACCOUNTING PRINCIPLE                    $  203,585  $  226,307  $  375,026  $  574,673
                                          ==========  ==========  ==========  ==========
                                                   
EARNINGS PER SHARE BEFORE                         
  CUMULATIVE ADJUSTMENT*                  $     1.10  $     1.12  $     3.12  $     2.84
                                          ==========  ==========  ==========  ==========
                                                          
NET EARNINGS PER SHARE AFTER                                
  CUMULATIVE ADJUSTMENT*                  $     1.10  $     1.12  $     1.93  $     2.84
                                          ==========  ==========  ==========  ==========
                                                                
DIVIDENDS PER SHARE**                     $     0.00  $     0.00  $     0.00  $     0.00
                                          ==========  ==========  ==========  ==========
 
</TABLE>
 *Earnings per share are calculated using weighted average shares outstanding
  for each period presented.

**Dividends per share are calculated using actual number of shares outstanding 
  at the end of each period presented.


See accountants' compilation report.
The accompanying notes are an integral part of this statement.

                                      F-28
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

           CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDER'S EQUITY
           ---------------------------------------------------------

<TABLE>
<CAPTION>
                                                                UNAUDITED                             
                                             ----------------------------------------------  
                                                 CAPITAL STOCK                    
                                                 --------------       CAPITAL     RETAINED
                                              SHARES     AMOUNT       SURPLUS     EARNINGS   
                                             --------  ----------   ----------  -----------  
<S>                                          <C>       <C>          <C>         <C>         
BALANCES AT JANUARY 1, 1992                   210,270  $  105,135   $4,660,218  $   496,807 
  Net earnings - year to date                                                       574,673  
  Purchase treasury stock                                                                
  Decrease in unrealized loss   (Note 2)                                                 
                                                                                
                                             --------  ----------   ----------  -----------  
                                                                                         
BALANCES AT SEPTEMBER 30, 1992                210,270  $  105,135   $4,660,218  $ 1,071,480
                                             ========  ==========   ==========  ===========  
                                                                                          
                                                                                          
BALANCES AT JANUARY 1, 1993                   210,270  $  105,135   $4,660,218  $ 1,189,750
  Net earnings - year to date                                                       375,026
  Purchase treasury stock                                                                
  Deferred FIT benefit on                                                                
   unrealized loss   (Note 13)                                                           
  Decrease in unrealized loss   (Note 2)                                                 
                                                                                         
                                             --------  ----------   ----------  -----------  
                                                                                         
BALANCES AT SEPTEMBER 30, 1993                210,270  $  105,135   $4,660,218  $ 1,564,776
                                             ========  ==========   ==========  ===========
</TABLE>                                                       



See accountants' compilation report.
The accompanying notes are an integral part of this statement.

                                     F-29 

<PAGE>

<TABLE>
<CAPTION>
                        UNAUDITED
- -----------------------------------------------------------
       TREASURY STOCK           UNREALIZED        TOTAL   
- --------------------------       LOSS ON      STOCKHOLDERS'
  SHARES           AMOUNT       SECURITIES       EQUITY
- ----------       ---------     ------------   -------------
<S>              <C>           <C>            <C>       
       102      ($   3,825)    ($   170,680)  $   5,087,655
                                                    574,673
     8,478      (  122,143)                        (122,143)
                                     45,898          45,898
                                                          
    ------      ----------     ------------   ------------- 
                                                          
     8,580      ($ 125,968)    ($   124,782)  $   5,586,083
    ======      ==========     ============   ============= 
                                                          
     8,617      ($ 126,356)    ($   122,548)  $   5,706,199
                                                    375,026
    16,267      (  344,860)                        (344,860)
                                                          
                                     41,688          41,688
                                     38,551          38,551
                                                          
    ------      ----------     ------------   ------------- 
                                                          
    24,884      ($ 471,216)    ($    42,309)  $   5,816,604
    ======      ==========     ============   ============= 
</TABLE>

                                     F-30
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                     -------------------------------------
<TABLE>
<CAPTION>
 
                                                             UNAUDITED
                                                  ----------------------------------
                                                         NINE MONTHS ENDED
                                                           SEPTEMBER 30,
                                                  ----------------------------------
                                                        1993             1992
                                                  ----------------  ----------------
                                            
<S>                                               <C>               <C>
CASH FLOWS FROM OPERATING ACTIVITIES:       
  Net earnings                                    $    375,026      $    574,673
  Adjustments to reconcile net earnings
  to net cash provided by operating
  activities:
    Depreciation and amortization                      125,401           105,597
    Provision for loan losses                          105,000            67,000
    Loss on sale/write down of assets                   99,363           164,364
    Premium amortization, net of
     discount accretion                                253,177           170,342
    Changes in other assets and
     liabilities:
      Increase (decrease) in other
       liabilities                                     367,322            (1,233) 
      (Increase) decrease in other
       assets                                    (     327,318)    (     243,695) 
                                                 -------------    --------------
 
  Net cash provided by operating
   activities                                     $    997,971      $    837,048
                                                 -------------    --------------
 
CASH FLOWS FROM INVESTING ACTIVITIES:
  Proceeds from sale of investment
   securities                                     $    656,621      $    754,176
  Proceeds from maturity of investment
   securities                                        4,287,501         6,379,250
  Purchase of investment securities                 (6,182,353)      (10,651,159) 
  Net (increase) in loans                             (494,288)       (4,653,370) 
  Purchase of property, plant and
   equipment                                           (53,619)          (70,788) 
  Proceeds from sale of fixed and other
   assets                                               46,120               -0-
  Net (increase) decrease in Fed Funds
   sold                                                 50,000         2,900,000
                                                 -------------    --------------
 
  Net cash (used) by investing
   activities                                    ($  1,690,018)    ($  5,341,891) 
                                                 -------------    --------------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Net increase in demand deposits                 $  1,432,955      $  3,843,667
  Net increase in savings deposits                     232,390           524,530
  Net (decrease) in time deposits                   (1,857,645)       (1,166,190) 
  Cash received on short-term
   borrowings                                          130,000               -0-
  Net (decrease) in Fed Funds purchased                (10,000)         (100,000) 
  Principal paid on long-term debt                     (65,576)          (40,297) 
  Cash received on refinance of
   long-term debt                                          -0-           132,379
  Dividends paid                                       (52,533)          (52,542) 
  Purchase of treasury stock                     (     344,860)              -0-
                                                 -------------    --------------
 
  Net cash provided (used) by financing
   activities                                    ($    535,269)     $  3,141,547
                                                 -------------    --------------
 
  Net (decrease) in cash and cash
   equivalents                                   ($  1,227,316)    ($  1,363,296) 
 
CASH AND CASH EQUIVALENTS
  AT BEGINNING OF YEAR                               4,747,085         4,957,032
                                                 -------------    --------------
 
CASH AND CASH EQUIVALENTS
  AT END OF PERIOD                                $  3,519,769      $  3,593,736
                                                 =============    ==============
</TABLE>

See accountants' compilation report.
The accompanying notes are an integral part of this statement.

                                      F-31
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                     -------------------------------------
<TABLE>
<CAPTION>
 
 
                                                      UNAUDITED
                                              -------------------------  
                                                  NINE MONTHS ENDED
                                                    SEPTEMBER 30,
                                              -------------------------
                                                 1993           1992
                                              -----------   -----------
<S>                                           <C>           <C> 
SCHEDULE OF NON-CASH INVESTING
  AND FINANCING ACTIVITIES:
  Assets acquired through foreclosure         $    75,319   $   446,561
  Parent purchased 8,478 shares of its
   stock from subsidiary                      $       -0-   $   122,143
 
OTHER DISCLOSURES:
  Interest paid                               $ 1,772,413   $ 2,268,340
  Federal income tax paid                     $   298,257   $    42,106
</TABLE>



See accountants' compilation report.
The accompanying notes are an integral part of this statement.

                                      F-32
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          DECEMBER 31, 1992 (AUDITED)

           NINE MONTHS ENDED SEPTEMBER 30, 1993 AND 1992 (UNAUDITED)
                                        

NOTE 1:  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     Significant accounting policies adopted by Concho Bancshares, Inc., the
     Company, are summarized below.

     Consolidation - The consolidated financial statements include Concho
     -------------                                                       
     Bancshares, Inc. and its subsidiary, Southwest Bank of San Angelo, after
     elimination of significant intercompany accounts. A consolidated federal
     income tax return is filed with Concho Bancshares, Inc.'s subsidiary,
     Southwest Bank of San Angelo.  Concho Bancshares, Inc. owns 99.69% of the
     outstanding common stock of Southwest Bank of San Angelo.

     Cash flows - For purposes of reporting cash flows, cash and cash
     ----------                                                      
     equivalents include cash on hand and amounts due from banks.  Cash flows
     from loans, demand deposits, NOW accounts, savings accounts, federal funds
     purchased and sold, and certificates of deposit, are reported net.

     Investment securities - Securities held for investment, other than mutual
     ---------------------                                                    
     funds, are stated at cost, adjusted for amortization of premiums and
     accretion of discounts computed on the straight-line method over the period
     from date of purchase to date of maturity.  The investment in mutual funds
     is stated at the lower of aggregate cost or market as of the balance sheet
     date.

     Interest income on loans - Interest on commercial, real estate and student
     ------------------------                                                  
     loans is recognized as earned based upon the principal amounts 
     outstanding.  Interest on installment loans is recognized as earned based
     on the rule of seventy-eights method.

     Building and equipment - Building and equipment are stated at cost less
     ----------------------                                                 
     accumulated depreciation computed by the straight-line and accelerated cost
     recovery system methods.  Accumulated depreciation as of September 30, 1993
     and 1992 is $ 2,117,360 and $ 1,949,468, respectively. Maintenance and
     repairs are charged to expense as incurred while improvements are
     capitalized and depreciated over the useful life of such improvements.

     Allowance for loan losses - The allowance for loan losses is available for
     -------------------------                                                 
     losses incurred on loans and is increased by provisions charged to
     operating expenses and reduced by charge-offs, net of recoveries.  The
     allowance is based on management's evaluation of the adequacy of the
     reserve.  This evaluation encompasses consideration of past loss experience
     and other factors, including changes in the composition and volume of the
     portfolio, the relationship of the allowance to the portfolio, and current
     economic conditions.

See accountants' compilation report.

                                     F-33
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          DECEMBER 31, 1992 (AUDITED)

           NINE MONTHS ENDED SEPTEMBER 30, 1993 AND 1992 (UNAUDITED)


NOTE 1:  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

     Amortization - Certain costs associated with the Company's investment
     ------------                                                         
     services have been capitalized and are being amortized by the straight-line
     method over a period of 60 months.  Total amortization expense for the nine
     months ended September 30, 1993 and 1992 was $ 3,000 each period.


NOTE 2:  INVESTMENT SECURITIES

     At December 31, 1992 and September 30, 1993 and 1992 the subsidiary held
     mutual fund investments with a cost basis of $ 964,843, $ 715,122 and 
     $ 1,070,889, respectively.  The portfolios of these mutual funds consisted
     of obligations of the United States government and agencies.  As of
     December 31, 1992 and September 30, 1993 and 1992, the aggregate cost of
     mutual fund investments exceeded their aggregate market value by $ 122,927,
     $ 84,213 and $ 125,168 respectively.

     Investment securities shown in the balance sheet are reflected net of
     accumulated accretion and amortization.

     At December 31, 1992 and September 30, 1993 and 1992, the amortized cost,
     estimated market values, and the gross unrealized gains and losses of
     investments in debt securities were as follows:

<TABLE>
<CAPTION>
                                              DECEMBER 31, 1992
                             --------------------------------------------------
                                              GROSS       GROSS      ESTIMATED
                               AMORTIZED    UNREALIZED  UNREALIZED     MARKET
                                 COST         GAINS       LOSSES       VALUE  
                             ------------   ----------  ----------  -----------
<S>                          <C>            <C>         <C>        <C>   
United States government     $ 17,511,071   $ 277,758   ($ 25,073) $ 17,763,756
United States agencies         12,211,810     352,867     (58,156)   12,506,521
Collateralized mortgage
 obligation                     2,938,724      84,839     (91,733)    2,931,830
Corporate bonds and notes             -0-         -0-         -0-           -0-
                             ------------   ---------  ----------  ------------
 
  Subtotal                   $ 32,661,605   $ 715,464  ($ 174,962) $ 33,202,107
 
FHLB stock                        303,337         -0-         -0-       303,337
                             ------------   ---------  ----------  ------------
 
Total                        $ 32,964,942   $ 715,464  ($ 174,962) $ 33,505,444
                             ============   =========  ==========  ============
</TABLE>



                                   Continued

See accountants' compilation report.

                                      F-34
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------        

                          December 31, 1992 (Audited)

           Nine Months Ended September 30, 1993 and 1992 (Unaudited)


NOTE 2:  INVESTMENT SECURITIES (Continued)

     The carrying value and approximate market value of debt securities at
     December 31, 1992, by contractual maturity, are shown below.  Expected
     maturities will differ from contractual maturities because borrowers may
     have the right to call or prepay obligations with or without call or
     prepayment penalties.

<TABLE>
<CAPTION>
                                                                             CARRYING       APPROXIMATE
                                                                              VALUE         MARKET VALUE
                                                                           ------------     -------------  
 
     <S>                                                                   <C>               <C>       
     Due in one year or less                                               $ 2,545,483       $ 2,575,470
     Due after one year through five years                                  18,181,825        18,392,451
     Due after five years through ten years                                        -0-               -0-
     Due after ten years                                                    11,934,297        12,234,186
                                                                           -----------       -----------
                                                                           $32,661,605       $33,202,107
                                                                           ===========       ===========
</TABLE>
 
   
<TABLE> 
<CAPTION> 
 
                                                                          SEPTEMBER 30, 1993
                                                                          ------------------
                                                                        GROSS              GROSS           ESTIMATED
                                                  AMORTIZED          UNREALIZED          UNREALIZED         MARKET
                                                    COST               GAINS               LOSSES            VALUE
                                                -------------      --------------      --------------    -------------            
     <S>                                        <C>                <C>                 <C>               <C> 
     United States government                   $  18,939,208      $      473,763      $          -0-    $  19,412,971
     United States agencies                         9,624,408             277,011      (       31,188)       9,870,231
     Collateralized mortgage
      obligation                                    5,290,015              50,631      (       36,385)       5,304,261
     Corporate bonds and notes                            -0-                 -0-                 -0-              -0-
                                                -------------      --------------      --------------    -------------            

      Subtotal                                  $  33,853,631      $      801,405      ($      67,573)   $  34,587,463
 
     FHLB stock                                       311,000                 -0-                 -0-          311,000
                                                -------------      --------------      --------------    -------------            
 
     Total                                      $  34,164,631      $      801,405      ($      67,573)   $  34,898,463
                                                =============      ==============      ==============    =============            
</TABLE>

                                   Continued


See accountants' compilation report.
 
                                     F-35
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          December 31, 1992 (Audited)

           Nine Months Ended September 30, 1993 And 1992 (Unaudited)


NOTE 2:  INVESTMENT SECURITIES (Continued)

     The carrying value and approximate market value of debt securities at
     September 30, 1993, by contractual maturity, are shown below.  Expected
     maturities will differ from contractual maturities because borrowers may
     have the right to call or prepay obligations with or without call or
     prepayment penalties.

<TABLE>
<CAPTION>
 
                                                           Carrying                   Approximate
                                                            Value                    Market Value
                                                        -------------               -------------
 
<S>                                                      <C>                         <C>
Due in one year or less                                   $ 8,093,560                 $ 8,195,341
Due after one year through five years                      13,442,299                  13,795,043
Due after five years through ten years                        969,024                     969,158
Due after ten years                                        11,348,748                  11,627,923
                                                          -----------                 -----------
 
                                                          $33,853,631                 $34,587,465
                                                          ===========                 ===========
</TABLE> 

<TABLE> 
<CAPTION> 
 
 
 
                                                          September 30, 1993
                                      ------------------------------------------------------------
                                                             Gross         Gross       Estimated           
                                        Amortized          Unrealized    Unrealized     Market     
                                          Cost               Gains         Losses       Value      
                                      -----------         -----------  ------------   -----------
<S>                                   <C>                 <C>            <C>          <C> 
United States government              $14,369,400         $   473,412     $    -0-    $14,842,812
United States agencies                 12,249,644             467,437     ( 24,725)    12,692,356
Collateralized mortgage
 obligation                             3,852,632              72,615     ( 36,730)     3,888,517
Corporate bonds and notes                 300,032                 718           -0-       300,750
                                      -----------         -----------  ------------   -----------
 
  Subtotal                            $30,771,708         $ 1,014,182     ($61,455)   $31,724,435
 
FHLB stock                            $   300,700                 -0-           -0-       300,700
                                      -----------         -----------  ------------   -----------
 
Total                                 $31,072,408         $ 1,014,182     ($61,455)   $32,025,135
                                      ===========         ===========     =========   ===========
</TABLE>



                                   Continued

See accountants' compilation report.


                                      F-36
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          DECEMBER 31, 1992 (AUDITED)

           NINE MONTHS ENDED SEPTEMBER 30, 1993 AND 1992 (UNAUDITED)


NOTE 2:  INVESTMENT SECURITIES (CONTINUED)

     The carrying value and approximate market value of debt securities at
     September 30, 1992, by contractual maturity, are shown below.  Expected
     maturities will differ from contractual maturities because borrowers may
     have the right to call or prepay obligations with or without call or
     prepayment penalties.

<TABLE>
<CAPTION>
                                                 CARRYING    APPROXIMATE
                                                   VALUE     MARKET VALUE
                                                -----------  ------------
     <S>                                        <C>          <C>
     Due in one year or less                    $   808,448   $   825,594
     Due after one year through five years       15,989,021    16,461,594
     Due after five years through ten years         423,558       430,376
     Due after ten years                         13,550,681    14,006,871
                                                -----------   -----------
                                        
                                                $30,771,708   $31,724,435
                                                ===========   ===========
</TABLE>

     Obligations of the United States government with par values of $ 3,000,000,
     $ 2,500,000 and $ 4,025,728, were pledged to secure various deposits as of
     December 31, 1992 and September 30, 1993 and 1992, respectively.


NOTE 3:  PENSION AND PROFIT SHARING PLANS

     The subsidiary has a non-contributory profit-sharing plan available to all
     regular employees who have completed six months of service.  Contributions
     to this plan are at the discretion of the subsidiary's board of directors. 
     The subsidiary also sponsors a defined contribution plan, whereby it
     matches 100% of employee contributions up to 4% of their compensation and
     50% of contributions on the next 2% of compensation.  Total expense,
     relating to the defined contribution plan for the nine months ended
     September 30, 1993 and 1992 was $ 33,693, and $ 37,603, respectively and
     are included in employee benefits in the consolidated statements of income.
     Administrative fees of the plans are paid by the subsidiary.  Employer
     contributions of both plans vest according to the following schedule:

<TABLE> 
<CAPTION> 
                 LENGTH OF SERVICE              VESTING
                 -----------------              -------
                 <S>                            <C> 
                      2 years                     20%
                      3 years                     30%
                      4 years                     40%
                      5 years                     60%
                      6 years                     80%
                      7 years                    100%
</TABLE> 
                                                 
See accountants' compilation reports.    

                                  F-37       
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          December 31, 1992 (Audited)

           Nine Months Ended September 30, 1993 and 1992 (Unaudited)


NOTE 4:  LOANS AND ALLOWANCE FOR LOAN LOSSES

     Major classifications of loans are as follows:

<TABLE>    
<CAPTION>
                                             SEPTEMBER 30,          SEPTEMBER 31,     
                                          1993          1992            1992          
                                      -----------    -----------    -------------     
     <S>                              <C>            <C>             <C>              
     Commercial                       $33,191,260    $32,075,609     $32,561,474      
     Real estate                        4,063,054      4,459,462       4,162,896      
     Installment, net of                                                              
      unearned discount                 2,828,785      3,934,979       3,821,648      
     Student loans                      4,791,072      4,304,375       4,101,729      
     Overdrafts                            33,714         22,093          28,742      
     Participations sold              (   947,300)   (   779,331)    ( 1,481,150)     
                                      -----------    -----------     -----------      
     Total loans, net of                                                              
      unearned discount               $43,960,585    $44,017,187     $43,195,339      
                                                                                      
     Less allowance for loan                                                          
      losses                              596,602        559,411         598,734      
                                      -----------    -----------     -----------      
                                                                                      
     NET LOANS                        $43,363,983    $43,457,776     $42,596,605      
                                      ===========    ===========     ===========       
 
Non-accrual loans are as follows:

     Principal balances of loans                                               
      on non-accrual status           $   701,469    $   795,417     $   638,371 
                                      ===========    ===========     =========== 
                                                                               
     Approximate interest                                                      
       foregone related to                                                     
       non-accrual loans              $    42,000    $    53,000     $    68,000   
                                      ===========    ===========     ===========     

Changes in the allowance for
  loan losses were as follows:
 
     BALANCE, BEGINNING                                                            
       OF PERIOD                      $   598,734    $   547,354     $   547,354                  
     Provision charged to                                                          
      operations                          105,000         67,000         205,000                  
     Loans charged off                (   156,246)   (    80,889)    (   180,956)      
     Recoveries                            49,114         25,946          27,336                  
                                      -----------    -----------     -----------
     BALANCE, END OF                                                               
       PERIOD                         $   596,602    $   559,411     $   598,734                  
                                      ===========    ===========     ===========     
</TABLE>

See accountants' compilation reports.

                                      F-38
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          DECEMBER 31, 1992 (Audited) 

           NINE MONTHS ENDED SEPTEMBER 30, 1993 AND 1992 (Unaudited)


NOTE 4:  LOANS AND ALLOWANCE FOR LOAN LOSSES (Continued)

     During the year ended December 31, 1988, the subsidiary changed its method
     of accounting for nonrefundable fees and costs associated with lending
     activities to comply with the requirements of Statement of Financial
     Accounting Standards No. 91.  Under the new accounting method, certain
     lending related costs are capitalized into the loan balance and amortized
     against interest income over the term of the loan.  Total capitalized loan
     cost and related amortization are as follows:
<TABLE>
<CAPTION>
 
                               BEGINNING OF                              END OF
                                THE PERIOD                             THE PERIOD
                               UNAMORTIZED   CAPITALIZED               UNAMORTIZED
                                LOAN COSTS   LOAN COSTS  AMORTIZATION  LOAN COSTS
                               ------------  ----------  ------------  -----------
                    
        <S>                    <C>           <C>         <C>           <C>
        December 31, 1992          $156,576    $155,419      $131,534     $180,461
                                   ========    ========      ========     ========
                    
        September 30, 1993         $180,461    $115,569      $115,635     $180,395
                                   ========    ========      ========     ========
                    
        September 30, 1992         $156,576    $119,000      $ 95,115     $180,461
                                   ========    ========      ========     ========
 
</TABLE>
     Loans at variable and fixed interest rates as of September 30, 1993 and
     1992 are as follows:
<TABLE>
<CAPTION>
 
                    
                              December 31, 1992         September 30, 1993        September 30, 1992
                           ------------------------  ------------------------  ------------------------
                            Variable       Fixed       Variable      Fixed       Variable       Fixed
                           -----------  -----------  -----------  -----------  -----------  -----------
     <S>                   <C>          <C>          <C>          <C>          <C>          <C> 
                                                    
     Commercial,
      including                                      
      overdrafts            $14,807,576  $16,383,126  $12,604,611  $19,748,620  $16,317,339  $15,084,251
                            ===========  ===========  ===========  ===========  ===========  ===========
                                                     
      Real estate           $ 1,445,205  $ 2,636,055  $   837,375  $ 3,150,122  $ 1,006,537  $ 3,369,706
                            ===========  ===========  ===========  ===========  ===========  ===========
                                                     
      Installment           $   428,414  $ 3,393,234  $   113,325  $ 2,715,460  $   432,848  $ 3,502,131
                            ===========  ===========  ===========  ===========  ===========  ===========
                                                     
      Student               $       -0-  $ 4,101,729  $       -0-  $ 4,791,072  $       -0-  $ 4,304,375
                            ===========  ===========  ===========  ===========  ===========  ===========
 
</TABLE>
     Original maturities for each loan category as of December 31, 1992 and
     September 30, 1993 and 1992 are as follows:

          Commercial  - less than 1 year to 30 years

          Real estate - 1 year to 30 years

          Installment - less than 1 year to 10 years

          Student     - 1 to 2 years

See accountants' compilation reports.
                                      F-39
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          DECEMBER 31, 1992 (AUDITED)

           NINE MONTHS ENDED SEPTEMBER 30, 1993 AND 1992 (UNAUDITED)


NOTE 4:  LOANS AND ALLOWANCE FOR LOAN LOSSES (CONTINUED)

     The subsidiary routinely sells its student loans to the Panhandle Plains
     Higher Education Agency prior to the loans reaching repayment stage.  For
     the nine months ended September 30, 1993 and 1992, the subsidiary sold
     approximately $ 2,561,871 and $ 1,619,700, respectively, of these loans
     under this program.


NOTE 5:  LAND, BUILDING AND EQUIPMENT

     Major classifications of these assets are as follows:

<TABLE> 
<CAPTION> 
                                      September 30,         September 30,        December 31,    
                                           1993                 1992                  1992       
                                      -------------         -------------        -------------   
     <S>                              <C>                   <C>                   <C>           
     Land                             $   327,000           $   327,000           $   327,000    
     Buildings                          3,719,533             3,701,945             3,711,293    
     Leasehold improvements               147,900               145,077               145,077    
     Automobiles                           58,528                49,271                58,528    
     Furniture and fixtures               732,702               734,768               743,263    
     Assets not in service                    -0-                   -0-                58,393    
                                      -----------           -----------           -----------    
                                                                                                 
                                      $ 4,985,663           $ 4,958,061           $ 5,043,554    
                                                                                                 
     Accumulated depreciation and                                                                
      amortization                      2,147,919             2,036,119             2,075,690    
                                      -----------           -----------           -----------    
                                                                                                 
     Land, building and equipment,                                                               
      net                             $ 2,837,744           $ 2,921,942           $ 2,967,864    
                                      ===========           ===========           ===========    
                                                                                                 
     Depreciation and amortization                                                               
      expense                         $   125,401           $   105,597           $   146,129    
                                      ===========           ===========           ===========     
 
</TABLE>

NOTE 6:  FEDERAL INCOME TAXES

     Concho Bancshares, Inc. files a consolidated tax return with it's sole
     subsidiary, Southwest Bank of San Angelo.  The provisions for federal
     income taxes for the nine month periods ended September 30, 1993 and 1992
     are based on the incomes and tax attributes of the consolidated entity.

     Income tax expense for the nine months ended September 30, 1993 and 1992,
     is based on the Company's estimate of the effective tax rates expected to
     be applicable for the full year.


See accountants' compilation reports.

                                      F-40
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          DECEMBER 31, 1992 (AUDITED)

           NINE MONTHS ENDED SEPTEMBER 30, 1993 AND 1992 (UNAUDITED)


NOTE 7:  FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK

     The subsidiary is a party to financial instruments with off-balance-sheet
     risk in the normal course of business to meet the financing needs of its
     customers.  These financial instruments include commitments to extend
     credit and letters of credit.  Those instruments involve elements of credit
     risk in excess of the amount recognized in the balance sheet.  The contract
     amounts of those instruments reflect the extent of involvement the
     subsidiary has in particular classes of financial instruments.

     The subsidiary's exposure to credit loss in the event of nonperformance by
     the other party to the financial instruments for commitments to extend
     credit and letters of credit is represented by the contractual amount of
     those instruments.  The subsidiary uses the same credit policies in making
     commitments and conditional obligations as it does for on-balance-sheet
     instruments.  The contract amounts of these commitments are as follows:

<TABLE>                                                       
<CAPTION>                                                     
                                          September 30,  December 31,      
                                              1993           1992          
                                         -------------- -------------      
          <S>                             <C>            <C>               
          Financial instruments whose                                      
            contract amounts represent                                     
            credit risk:                                                   
          Commitments to extend credit   $ 6,364,572    $ 4,740,485        
          Letters of Credit                  790,234        726,980        
                                         -----------    -----------        
                                         $ 7,154,806    $ 5,467,465        
                                         ===========    ===========         
</TABLE>                                                       

     Commitments to extend credit are agreements to lend to a customer as long
     as there is no violation of any condition established in the contract. 
     Commitments may expire without being drawn upon; therefore, the total
     commitment amounts do not necessarily represent future cash requirements. 
     The subsidiary evaluates each customer's creditworthiness on a case by case
     basis.  The amount of collateral obtained if deemed necessary by the
     subsidiary upon extension of credit is based upon management's credit
     evaluation.

See accountants' compilation reports.

                                      F-41
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          DECEMBER 31, 1992 (AUDITED)

           NINE MONTHS ENDED SEPTEMBER 30, 1993 AND 1992 (UNAUDITED)


NOTE 7:  FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET
            RISK (CONTINUED)

     Letters of credit are conditional commitments issued by the bank to
     guarantee the performance of a customer to a third party.  The credit risk
     involved in issuing letters of credit is essentially the same as that
     involved in extending loan facilities to customers.


NOTE 8:  DEFERRED COMPENSATION

     The subsidiary maintains a deferred compensation plan for its directors
     funded by the purchase of life insurance policies on each participant. 
     Other pertinent financial information relating to the subsidiary's deferred
     compensation plans is as follows:
<TABLE>
<CAPTION>
 
 
                                           September 30,  September 30,  December 31,  
                                               1993           1992           1992      
                                           -------------  -------------  ------------  
                                                                                       
       <S>                               <C>            <C>            <C>             
       Life insurance premiums paid         $    3,200     $    4,480    $    5,600    
                                            ==========     ==========    ==========    
                                                                                       
       Cash surrender value of life                                                    
        insurance policies                  $  265,487     $  235,967    $  244,957    
                                            ==========     ==========    ==========    
                                                                                       
       Accrued deferred compensation                                                   
        liability                           $  123,174     $   94,862    $  100,548    
                                            ==========     ==========    ==========    
                                                                                       
       Current year deferred                                                           
        compensation expense                $   22,626     $   17,298    $   22,744    
                                            ==========     ==========    ==========     
 
</TABLE>

NOTE 9:  RELATED PARTY TRANSACTIONS

     As of December 31, 1992 and September 30, 1993 and 1992, certain officers
     and directors and companies in which they have a beneficial ownership were
     indebted to the subsidiary in the aggregate amount of $ 789,332, $ 883,813
     and $ 884,207, respectively.  On January 31, 1992, the company issued notes
     to certain customers and directors that are more fully described in Note
     10.

See accountants' compilation reports.
                                      F-42
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          DECEMBER 31, 1992 (AUDITED)

           NINE MONTHS ENDED SEPTEMBER 30, 1993 AND 1992 (UNAUDITED)


NOTE 10:  NOTES PAYABLE

     Notes payable represents one note payable to a local financial institution
     and 13 individual promissory notes issued to certain of the company's
     customers and directors.  Original principal amount of the note payable to
     the financial institution was $ 130,000.  Each of the 13 individual
     promissory notes was issued for $ 100,000 and all bear the same terms,
     maturity date and collateral.  The collateral for the 13 promissory notes
     is held at Bank of the West, San Angelo, Texas.  The terms of these notes
     are as follows:

<TABLE>
<CAPTION>
                                                 LENDER
                            ----------------------------------------------
         
                            Bank of the West             13-Various
                            ----------------  ----------------------------
         <S>                <C>               <C>
        
         Date of note(s)      June 2, 1993      January 21, 1992
         Maturity date        June 2, 1994      January 21, 1997
         Collateral           Unsecured         Real estate and 119,504
                                                   shares of Southwest
                                                   Bank common stock
         Interest rate        7.00%             9.50%
         Payments             Balance due at    19 quarterly payments
                                maturity         of $ 50,702.86,
                                                 including interest,
                                                 beginning April 21,
                                                 1992; balance due at
                                                 maturity
  
</TABLE>

     Following are the maturities of these notes over the next five years:

<TABLE>
        <S>                        <C>
        1993-94                    $   224,611
        1994-95                        103,924
        1995-96                        114,154
        1996-97                        860,900
        1997-98                            -0-
                                   -----------
                 
        Total                      $ 1,303,589
                                   ===========
</TABLE>

See accountants' compilation reports.        

                                     F-43
        
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          DECEMBER 31, 1992 (AUDITED)

           NINE MONTHS ENDED SEPTEMBER 30, 1993 AND 1992 (UNAUDITED)


NOTE 11:  RETAINED EARNINGS

     Banking regulations limit the amount of dividends that may be paid without
     prior approval of the Bank's regulatory agency.


NOTE 12:  LEASES

     As of December 31, 1992 and September 30, 1992, the subsidiary leased
     computer equipment under agreements determined to be operating leases.  The
     provisions of these lease agreements are described as follows:

<TABLE>
<CAPTION>
                                     Computer     Computer       Computer
                                     Equipment    Equipment      Equipment
                                     Lease #1     Lease #2       Lease #3
                                     ---------    ---------      ---------
      <S>                            <C>          <C>            <C> 
      Primary lease term                36 mos       36 mos         36 mos
                                                                          
      Date of lease                   12-27-89     08-23-89       01-29-90
                                                                          
      Lease renewal option at                                             
       expiration of primary term       24 mos       24 mos         24 mos 
                                                                 
      Monthly lease amount                                       
        Primary term:                                            
                                                                 
        Year one                     $   5,664    $   1,950      $     345
        Year two                         6,231        2,145            380
        Year three                       6,854        2,359            418
                                                                         
        Option period:                                                   
                                                                         
        Year one                         7,539        2,595            459
        Year two                         8,141        2,846            467
                                                                         
      Penalty for non-renewal           18,626        6,430          1,136
</TABLE>



See accountants' compilation reports.

                                      F-44
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          DECEMBER 31, 1992 (AUDITED)

           NINE MONTHS ENDED SEPTEMBER 30, 1993 AND 1992 (UNAUDITED)


NOTE 12:  LEASES (CONTINUED)

     Minimum future rental payments under the primary and optional terms of
     these lease agreements as of December 31, 1992 and September 30, 1992 for
     each of the next five years and in the aggregate are as follows:

<TABLE>
<CAPTION>
 
                 September 30,  December 31,  
                     1992           1992      
                 -------------  ------------  
       <S>       <C>            <C>           
       1993      $     126,125  $    122,596  
       1994            130,528       117,012  
       1995             17,683         8,141  
       1996                -0-           -0-  
       1997                -0-           -0-  
                 -------------  ------------  
                                              
       Total     $     274,336  $    247,749  
                 =============  ============
</TABLE>

     As of September 30, 1993, the subsidiary leased computer equipment under an
     agreement determined to be an operating lease.  The lease agreements that
     previously existed were terminated and combined into one lease agreement
     dated February 23, 1993.  The provisions of this agreement are described as
     follows:

<TABLE>
        <S>                               <C> 
        Primary term                      36 mos.

        Date of lease                     2-23-93

        Lease renewal option at
          expiration of primary term      24 mos.

        Primary term                      $ 6,890/mo.

        Option period                     $ 6,890/mo.

        Penalty for non-renewal           $ 20,150
</TABLE>

     Minimum future rental payments under the primary and optional terms of this
     lease agreement as of September 30, 1993 for each of the next five years
     and in the aggregate are as follows:

<TABLE>
 
        <S>      <C>     
        1994     $  82,680
        1995        82,680
        1996        82,680
        1997        82,680
        1998        27,560
                 ---------
                         
          Total  $ 358,280
                 =========
</TABLE>

See accountants' compilation reports.

                                     F-45
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          DECEMBER 31, 1992 (AUDITED)

           NINE MONTHS ENDED SEPTEMBER 30, 1993 AND 1992 (UNAUDITED)


NOTE 12:  LEASES (CONTINUED)

     Lease expense under all operating leases is as follows:

<TABLE>
<CAPTION>
                                            September 30,  September 30,
                                                 1993           1992
                                            -------------  -------------
        <S>                                 <C>            <C>
        Non-cancelable operating leases     $      64,987  $      88,706
        Other leases                               26,588         21,256
                                            -------------  -------------
 
        Total                               $      91,575  $     109,962
                                            =============  =============
</TABLE>

     Other leases are agreements under which the subsidiary leases certain
     equipment.  The terms of these agreements do not extend for more than one
     year from the balance sheet date or they are cancelable at the option of
     the lessee.


NOTE 13:  CHANGE IN ACCOUNTING PRINCIPLE


     During the nine month period ended September 30, 1993, the Company changed
     its method of accounting for federal income taxes to conform with the
     requirements of Statement of Financial Accounting Standards No. 109.  No
     effect on federal income taxes for the nine months ended September 30, 1993
     has been recorded based upon the application of the new accounting
     principle. Financial statements for periods ended prior to January 1, 1993
     have not been restated, and the cumulative effect of the change of 
     $ 231,213 ($ 1.19 per share) is shown as a one-time charge to income in the
     September 30, 1993 income statement.


NOTE 14:  FAIR VALUE OF FINANCIAL INSTRUMENTS

     Statement of Financial Accounting Standards No. 107, "Disclosures about
     Fair Value of Financial Instruments", requires all entities to disclose the
     estimated fair value of its financial instrument assets and liabilities. 
     For the Company, as for most financial institutions, approximately 95% of
     its assets and 99% of its liabilities are considered financial instruments
     as defined in Statement No. 107.  Many of the Company's financial
     instruments, however, lack an available trading market as characterized by
     a willing buyer and willing seller engaging in an exchange transaction.  It
     is also the Company's general practice and intent to hold its financial
     instruments to maturity and to not engage in trading or sales activities. 
     Therefore, significant estimations and present value calculations were used
     by the Company for the purpose of this disclosure.

     Estimated fair values have been determined by the Company using the best
     available data, as generally provided in the Company's Regulatory Reports,
     and an estimation methodology suitable for each category of financial
     instruments.  For those loans and deposits with floating interest rates, it
     is presumed that estimated fair values generally approximate the recorded
     book balances.  The estimation methodologies used, the estimated fair
     values, and recorded book balances at December 31, 1992, and September
     30,1993 were as follows:

See accountants' compilation reports. 

                                     F-46
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          DECEMBER 31, 1992 (AUDITED)

           NINE MONTHS ENDED SEPTEMBER 30, 1993 AND 1992 (UNAUDITED)


NOTE 14:  FAIR VALUE OF FINANCIAL INSTRUMENTS (CONTINUED)

     *Financial instruments actively traded in a secondary market have been
     valued using quoted available market prices.

<TABLE>
<CAPTION>
                                        ESTIMATED                    RECORDED           
                                          FAIR                         BOOK             
                                          VALUE                      BALANCE            
                               ---------------------------  --------------------------- 
                                                                                        
                               September 30,  December 31,  September 30,  December 31, 
                                   1993           1992          1993           1992     
                               -------------  ------------  -------------  ------------ 
     <S>                         <C>           <C>            <C>           <C>         
     Cash and due from banks     $ 3,519,769   $ 4,747,085    $ 3,519,769   $ 4,747,085 
     Federal funds sold            2,500,000     2,550,000      2,500,000     2,550,000 
     Investment securities                                                              
       (Note 2)                   35,529,372    34,347,360     34,795,540    33,806,858  
</TABLE>

     *Financial instruments with stated maturities have been valued using a
     present value discounted cash flow with a discount rate approximating
     current market for similar assets and liabilities.  Financial instrument
     assets with variable rates and financial instrument liabilities with no
     stated maturities have an estimated fair value equal to both the amount
     payable on demand and the recorded book balance.

<TABLE>
<CAPTION>
                                       ESTIMATED                     RECORDED           
                                         FAIR                          BOOK             
                                         VALUE                       BALANCE            
                              ---------------------------  ---------------------------  
                                                                                        
                              September 30,  December 31,  September 30,  December 31,  
                                  1993           1992          1993           1992      
                              -------------  ------------  -------------  ------------  
     <S>                       <C>           <C>            <C>           <C>          
     Deposits with stated                                                               
      maturities               $ 34,433,825  $ 36,061,445   $ 34,267,984  $ 35,906,058  
     Deposits with no stated                                                            
      maturities                 46,634,889    45,189,115     46,634,889    45,189,115  
     Mortgage payable             1,268,920     1,334,415      1,173,589     1,239,164  
     Net loans                   43,393,878    43,125,697     43,363,983    42,596,605   
</TABLE>

     Changes in assumptions or estimation methodologies may have a material
     effect on these estimated fair values.

     The Company's remaining assets and liabilities which are not considered
     financial instruments have not been valued differently than has been
     customary with historical cost accounting.  No disclosure of the
     relationship value of the Company's deposits is required by Statement No.
     107 nor has the Company estimated its value.  There is no material
     difference between the notional amount and the estimated fair value of
     off-balance-sheet unfunded loan commitments which total $ 4,740,485 and 
     $ 6,364,572 at December 31, 1992 and September 30, 1993, respectively, and
     are generally priced at market at the time of funding.  Letters of credit
     discussed in Note 7 have an estimated fair value based on fees currently
     charged for similar agreements.  At December 31, 1992 and September 30,
     1993, fees related to the unexpired term of the letters of credit are not
     significant.

See accountants' compilation reports.

                                      F-47
<PAGE>

                    CONCHO BANCSHARES, INC. AND SUBSIDIARY

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                  ------------------------------------------

                          DECEMBER 31, 1992 (AUDITED)

           NINE MONTHS ENDED SEPTEMBER 30, 1993 AND 1992 (UNAUDITED)


NOTE 14:  FAIR VALUE OF FINANCIAL INSTRUMENTS (CONTINUED)

     Management is concerned that reasonable comparability between financial
     institutions may not be likely due to the wide range of permitted valuation
     techniques and numerous estimates which must be made given the absence of
     active secondary markets for many of the financial instruments.  This lack
     of uniform valuation methodologies also introduces a greater degree of
     subjectivity to these estimated fair values.

NOTE 15:  SUBSEQUENT EVENT

     On November 29, 1993, the Company rescinded the May 1993 purchase of 
     16,267 shares of stock into the treasury at the original purchase price of 
     $344,860. This agreement was entered into in complete settlement of a claim
     asserted by the stockholder relating to the possible acquisition of the 
     company by First Financial Bankshares, Inc. The Company agreed to 
     repurchase the shares of stock at the same purchase price in the event that
     the proposed stock exchange offer by First Financial Bankshares, Inc. is 
     not consummated.

See accountants' compilation reports.
                                      F-48
<PAGE>

                                    Annex A

                                January 7, 1994


The Board of Directors 
Concho Bancshares, Inc. 
P. O. Box 60410
San Angelo, Texas 76906

Dear Sirs

Pursuant to Section 2.2 of the Stock Exchange Agreement and Plan of
Reorganization, dated as of December 7, 1993 (the "Agreement") among First
Financial Bankshares, Inc. ("First Financial"), Concho Bancshares, Inc.
("Concho") and Southwest Bank of San Angelo ("Southwest Bank"), our opinion has
been requested with respect to certain of the Federal income tax consequences of
the exchange by the Concho shareholders of their Concho stock for First
Financial voting common stock (the "Stock Exchange") and the merger of Concho
with and into First Financial Bankshares of Delaware, Inc. ("FFB Delaware"), a
wholly-owned subsidiary of First Financial (the "Merger").  This opinion letter
                                                            -------------------
supersedes our opinion letter dated December 17, 1993.
- ------------------------------------------------------

In rendering our opinion, we have reviewed the Agreement and such other
documents as we have deemed necessary or appropriate.  We have relied upon the
accuracy and completeness of the facts, information, covenants and 
representations contained in the Agreement and such other documents. 
Furthermore, we have assumed that the Stock Exchange and Merger will be
consummated in accordance with the Agreement and that the Merger will qualify as
a merger under applicable State law.

In rendering our opinion, we have considered the applicable provisions of the
Internal Revenue Code of 1986, as amended (the "Code"), Treasury Regulations
promulgated thereunder, pertinent judicial authorities, interpretive rulings of
the Internal Revenue Service and such other authorities as we have considered
relevant.  It should be noted that statutes, regulations, judicial decisions and
administrative interpretations are subject to change at any time and, in some
circumstances, with retroactive effect.  A material change in the authorities
upon which our opinion is based could affect our conclusions.  However, we
assume no obligation to revise or supplement this opinion if any subsequent
change were to occur.

Requisite to a tax-free reorganization under the Code is a continuity of
interest in the business enterprise on the part of those persons who were the
owners of the enterprise prior to the reorganization.  Accordingly, the Concho
shareholders, as a group, will be required to satisfy the continuity of interest
doctrine through a post-exchange continuing ownership
<PAGE>


The Board of Directors 
Concho Bancshares, Inc. 
January 7, 1994        
Page 2                  

of the First Financial voting common stock received in the Stock Exchange.  In
this regard, a disposition by the Concho shareholders of a substantial portion
(in the aggregate) of their post-exchange First Financial shares which is
pursuant to a plan, intention or arrangement existing at the time of the Stock
Exchange will result in a failure to satisfy the continuity of interest
doctrine.  The Internal Revenue Service takes the position that 50 percent (in
the aggregate) constitutes a "substantial portion."  A failure to satisfy the
continuity of interest doctrine will result in the Stock Exchange being a
taxable transaction to the Concho shareholders.  In rendering our opinion, we
have assumed that the continuity of interest doctrine can and will be satisfied.

Also requisite to a tax-free reorganization under the Code is a continuity of
the business enterprise under the modified corporate form.  The continuity of
business enterprise doctrine requires that the acquiring corporation either
continue the acquired corporation's historic business or use a significant
portion of the acquired corporation's historic business assets in a business. 
Accordingly, in order to satisfy the continuity of business enterprise doctrine,
First Financial and/or one or more of its controlled subsidiaries will be
required to either continue the historic business of Concho and Southwest Bank
or use a significant portion of the historic business assets of Concho and
Southwest Bank in a business.  A failure to satisfy the continuity of business
enterprise doctrine will result in the Stock Exchange being a taxable
transaction to the Concho shareholders.  In rendering our opinion, we have
assumed that the continuity of business enterprise doctrine will be satisfied.

In addition to the requirements noted in the foregoing for a tax-free
reorganization under the Code, there is the requirement that, immediately after
a stock-for-stock exchange, the acquiring corporation must have control of the
acquired corporation.  For purposes of the reorganization provisions of the
Code, the term "control" means the ownership of stock possessing at least 80
percent of the total combined voting power of all classes of stock entitled to
vote and at least 80 percent of the total number of shares of all other classes
of stock of the corporation.  Therefore, in order to satisfy the control
requirement, First Financial and/or one or more of its controlled subsidiaries
will have to own at least 80 percent of the outstanding stock of Concho
immediately after the Stock Exchange.  If the Stock Exchange is consummated with
First Financial acquiring less than 80 percent of the outstanding stock of
Concho, the Stock Exchange will be a taxable transaction to the Concho
shareholders.  In rendering our opinion, we have assumed that the control
requirement will be satisfied.

Based solely upon and subject to the foregoing, we are of the opinion that under
current law:

     1.   The Stock Exchange and Merger will be treated as a reorganization
          within the meaning of Section 368(a) of the Code, and First Financial,
          Concho and FFB Delaware each will be a party to the reorganization
          within the meaning of Section 368(b) of the Code.

     2.   No gain or loss will be recognized by the Concho shareholders upon
          receipt of

<PAGE>

The Board of Directors 
Concho Bancshares, Inc. 
January 7, 1994        
Page 3                  

          First Financial voting common stock in exchange for their Concho
          stock, except for any gain or loss recognized with respect to
          shareholders who receive cash in lieu of fractional share interests in
          First Financial voting common stock or pursuant to the exercise of
          statutory dissenter rights.

     3.   The aggregate Federal income tax basis of the shares of First
          Financial voting common stock received by the Concho shareholders in
          exchange for their shares of Concho stock will be the same as the
          aggregate adjusted tax basis of their Concho stock exchanged therefor,
          less the tax basis, if any, allocated to fractional share interests.

     4.   The holding period of the First Financial voting common stock received
          by the Concho shareholders in exchange for their shares of Concho
          stock in the hands of the Concho shareholders will include the holding
          period of their Concho stock exchanged therefor.

Except as set forth above, we express no opinion as to the tax consequences,
whether Federal, State or local, of the Stock Exchange and Merger, or of any
transactions related thereto.  We are furnishing this opinion to you solely in
connection with Section 2.2 of the Agreement.  This opinion is solely for your
benefit and is not to be used, circulated, quoted or otherwise referred to for
any purpose without our prior consent.

We hereby consent to the references made to us in the Summary and under the
heading "The Exchange Offer - Certain Federal Income Tax Consequences" in the
Offering Circular/Prospectus of First Financial Relating to the Stock Exchange,
and to the inclusion of this opinion as an Annex to the Offering
Circular/Prospectus and the filing of this opinion as an exhibit to the
Registration Statement on Form S-4 of which such Offering Circular/Prospectus is
a part.


                                    Very truly yours






                                    ARMSTRONG, BACKUS & CO., L.L.P.

<PAGE>

                                    ANNEX B

                 ARTICLE 5.16 OF TEXAS BUSINESS CORPORATION ACT
                                        
                      MERGER OF SUBSIDIARY OR SUBSIDIARIES
                            INTO PARENT CORPORATION


                                 QUALIFICATIONS

     A.  In any case in which at least ninety (90%) percent of the outstanding
shares of each class and series of a domestic or foreign corporation or
corporations is owned by another domestic or foreign corporation, and at least
one of such corporations is a domestic corporation and the other or others are
domestic corporations or foreign corporations organized under the laws of a
jurisdiction that permit such a merger, the corporation having such share
ownership may (1) merger such other domestic or foreign corporation or
corporations into itself, (2) merger itself into such other corporation, or (3)
merger itself and one or more of such corporations into another of such domestic
or foreign corporations:

     (a)  in the event that the corporation having share ownership will be a
surviving corporation in the merger, by executing and filing articles of merger
in accordance with Section B of this Article; or

     (b)  in the event that the corporation having such share ownership will not
be a surviving corporation in the merger, by the corporation having such share
ownership adopting a plan of merger in the manner required by Article 5.03 of
this Act, except that no action under Section 5.03 shall be required to be taken
by the corporation or corporations whose shares are so owned, and executing and
filing articles of merger in accordance with Section B of this Article.

                        SIGNATURE OF ARTICLES; CONTENTS

     B.  The articles of merger shall be signed on behalf of the parent
corporation by an officer and shall set forth:

     (1)  The name of the parent corporation, and the name or names of the
subsidiary corporations and the respective jurisdiction under which each such
corporation is organized.

     (2)  The number of outstanding shares of each class of each subsidiary
corporation and the number of such shares of each class owned by the parent
corporation.

     (3)  A copy of the resolution adopted by the board of directors of the
parent corporation to so merge and the date of the adoption thereof. If the
parent corporation does not own all the outstanding shares of each class of each
subsidiary corporation that is a party to the merger, the resolution shall state
the terms and conditions of the merger, including the cash or other property,
including shares, obligations, evidences of ownership, rights to purchase
securities, or other securities of any person or entity or any combination of
the shares,

                                       1
<PAGE>

obligations, evidences of ownership, rights, or other securities, to be used,
paid or delivery by the surviving corporation upon surrender of each share of
the subsidiary corporation or corporations not owned by the parent corporation.

     (4)  If the surviving corporation is a foreign corporation, the address,
including street number if any, of its registered or principal office in the
jurisdiction under whose laws it is governed. If the surviving corporation is a
foreign corporation, on the merger taking effect the surviving foreign
corporation is deemed to (a) appoint the Secretary of State of this state as its
agent for service of process to enforce an obligation or the rights of
dissenting shareholders of each domestic corporation that is a party to the
merger, and (b) agree that it will promptly pay to the dissenting shareholders
of each domestic corporation that is a party to the merger the amount, if any,
to which they are entitled under this Article.

     (5)  If a plan of merger is required by Section A of this Article to be
adopted in the manner required by Article 5.03 of this Act, the information
required by Section A of Article 5.04 of this Act.

     C.  DELIVERY TO SECRETARY OF STATE; DUTIES. The original and a copy of the
articles of merger shall be delivered to the Secretary of State. If the
Secretary of State finds that such articles conform to law; he shall, when all
fees and franchise taxes have been paid as required by law:

     (1)  Endorse on the original and the copy the word "Filed," and the month,
day and year of the filing thereof.

     (2)  File the original in his office.

     (3)  Issue a certificate of merger to which he shall affix the copy and
deliver them to the surviving corporation or its representative.

     D.  EFFECTIVE DATE AND EFFECT. The effective date and the effect of such
merger shall be the same as provided in Articles 5.05 and 5.06 of this Act if
the surviving corporation is a domestic corporation. If the surviving
corporation is a foreign corporation, the effective date and the effect of such
merger shall be the same as in the case of the merger of domestic corporations
except in so far as the laws of such other jurisdiction provide otherwise.

                        REMEDY OF MINORITY SHAREHOLDERS

     E.  In the event all of the shares of a subsidiary domestic corporation
that is a party to a merger effected under this Article are not owned by the
parent corporation immediately prior to the merger, the surviving corporation
(foreign or domestic) shall, within ten (10) days after the effective date of
the merger, mail to each shareholder of record of each subsidiary domestic
corporation a copy of the articles of merger and notify the shareholder that the
merger has become effective. Any such shareholder who holds shares of a class or
series that would have been entitled to vote on the merger if it had been
effected pursuant to Article 5.03 of this Act shall have the right to dissent
from the merger and demand payment of the fair value for his shares in lieu of
the cash or other property to be used, paid or delivered to such shareholder

                                       2
<PAGE>

upon the surrender of such shareholder's shares pursuant to the terms and
conditions of the merger, with the following procedure:

     (1)  Such shareholder shall within twenty (20) days after the mailing of
the notice and copy of the articles of merger make written demand on the
surviving corporation, domestic or foreign, for payment of the fair value of his
shares. The fair value of the shares shall be the value thereof as of the day
before the effective date of the merger, excluding any appreciation or
depreciation in anticipation of such act. The demand shall state the number and
class of the shares owned by the dissenting shareholder and the fair value of
such shares as estimated by him. Any shareholder failing to make demand within
the twenty (20) day period shall be bound by the corporate action.

     (2)  Within ten (10) days after receipt by the surviving corporation of a
demand for payment by the dissenting shareholder of the fair value of his shares
in accordance with Subsection (1) of this section, the corporation (foreign or
domestic) shall deliver or mail to the dissenting shareholder a written notice
which shall either set out that the corporation (foreign or domestic) accepts
the amount claimed in the demand and agrees to pay such amount within ninety
(90) days after the date on which the corporate action was effected and, in the
case of shares represented by certificates, upon the surrender of the shares
certificates duly endorsed, or shall contain an estimate by the corporation of
the fair value of such shares, together with an offer to pay the amount of that
estimate within ninety (90) days after the date on which such corporate action
was effected, upon receipt of notice within sixty (60) days after that date from
the shareholder that the shareholder agrees to accept that amount and, in the
case of shares represented by certificates, upon the surrender of the shares
certificates duly endorsed.

     (3)  If, within sixty (60) days after the date on which the corporate
action was effected, the value of the shares is agreed upon between the
dissenting shareholder and the surviving corporation (foreign or domestic),
payment for the shares shall be made within ninety (90) days after the date on
which the corporate action was effected and, in the case of shares represented
by certificates, upon surrender of his certificate or certificates representing
such shares. Upon payment of the agreed value, the dissenting shareholder shall
cease to have any interest in such shares or in the corporation.

     (4)  If, within sixty (60) days after the date on which such corporate
action was effected, the shareholder and the surviving corporation (foreign or
domestic) do not so agree, then the dissenting shareholder or the corporation
(foreign or domestic) may, within sixty (60) days after the expiration of the
sixty (60) day period, file a petition in any court of competent jurisdiction in
the county in which the principal office of the corporation is located, asking
for a finding and determination of the fair value of the shareholder's shares as
provided in Section B of Article 5.12 of this Act and thereupon the parties
shall have the rights and duties and follow the procedure set forth in Sections
B to D inclusive of Article 5.12.

     (5)  In the absence of fraud in the transaction, the remedy provided by
this Article to a shareholder objecting to the corporate action is the exclusive
remedy for the recovery of the value of his shares or money damages to the
shareholder with respect to the corporate action. If the surviving corporation
(foreign or domestic) complies with the requirements of this Article, any such
shareholder who fails to comply with the requirements of this Article shall not
be

                                       3
<PAGE>

entitled to bring suit for the recovery of the value of his shares or money
damages to such shareholder with respect to such corporate action.

                            DISSENTING SHAREHOLDERS

     F.  If a plan of merger is required by Section A of this Article to be
adopted in the manner required by Article 5.03 of this Act, the provisions of
Articles 5.11 and 5.12 of this Act shall apply to the rights of the shareholders
of the parent corporation to dissent from such merger. Except as otherwise
provided in this Article, the provisions of Articles 5.11 and 5.12 of this Act
shall not be applicable to a merger effected under the provisions of this
Article. The provisions of Article 5.13 of this Act shall be applicable to any
merger effected under the provisions of this Article to the extent provided in
Article 5.13 of this Act.

                                       4
<PAGE>

                                    PART II
                    INFORMATION NOT REQUIRED IN PROSPECTUS
                    --------------------------------------



Item 20.     Indemnification of Officers and Directors.
             ------------------------------------------

     Article 2.02-1 of the Texas Business Corporation Act (the "TBCA")
provides that a Texas corporation, such as First Financial Bankshares, Inc.
("First Financial"), may indemnify a director or officer of the corporation
against judgments, penalties, fines, settlements and reasonable expenses
incurred in connection with any threatened, pending or completed action, suit or
proceeding, whether civil, criminal, administrative, arbitrative or
investigative, any appeal in such an action and any inquiry or investigation
that could lead to such an action, because the person is or was a director of
officer of the corporation.  In order to be entitled to such indemnification,
the director of officer must have conducted himself in good faith and reasonably
believed (i) in the case of conduct in his official capacity with the
corporation, that his conduct was in the corporation's best interest, (ii) in
all other cases, that his conduct was at least not opposed to the corporation's
best interest, and (iii) in the case of any criminal proceeding, that his
conduct was not unlawful.  Article 2.02-1 of the TBCA provides that a director
or officer may not be indemnified for proceedings in which the person is found
liable on the basis that a personal benefit was improperly received or in which
the person is found liable to the corporation.

     The First Financial Articles of Incorporation provide that, to the
fullest extent permitted by applicable law, each director, officer, employee and
agent of First Financial shall be indemnified for all expenses incurred in
connection with any action, suit, proceeding or claim to which he or she is
named a party or otherwise by virtue of holding such position; provided,
however, that no indemnification of employees or agents (other than directors or
officers) will be made without express authorization of the Board of Directors.

     The First Financial Articles of Incorporation also provide that, to the
fullest extent permitted by applicable law, no First Financial director shall be
liable to First Financial or the First Financial shareholders for monetary
damages for or with respect to any acts or omissions in his or her capacity as a
director, except in the case of liability for (i) a breach of a duty of loyalty
to First Financial or its shareholders, (ii) an act or omission not in good
faith or that involves intentional misconduct or a knowing violation of the law,
(iii) a transaction from which a director received an improper benefit, (iv) an
act or omission for which the liability of a director is expressly provided by
statute, or (v) an act related to an unlawful stock repurchase or payment of a
dividend.


Item 21.     Exhibits and Financial Statement Schedules.
             ------------------------------------------ 

     (a)     Exhibits.  The following exhibits are filed as part of this 
Registration Statement.

                                      II-1
<PAGE>

<TABLE> 
<CAPTION> 

    Item 601
Regulation S-K
Exhibit Reference
    Number                                    Description
- ------------------       -------------------------------------------------------
<S>                      <C> 
     2                   Stock Exchange Agreement and Plan of Organization dated
                         as of December 7, 1993 by and between First Financial
                         Bankshares, Inc., Concho Bancshares, Inc. and Southwest
                         Bank of San Angelo.

     3.1                 Articles of Incorporation, and all amendments thereto,
                         of the Registrant (incorporated by reference from
                         Exhibit 1 of the Registrant's Amendment No. 1 to Form
                         8-A filed on Form 8-A/A No. 1 on January 7, 1994).

     3.2                 Amended and Restated Bylaws of the Registrant, and all
                         amendments thereto (incorporated by reference from
                         Exhibit 2 of the Registrant's Amendment No. 1 to Form
                         8-A filed on Form 8-A/A No. 1 on January 7, 1994).

     4                   Specimen certificate for First Financial Common Stock
                         (incorporated by reference from Exhibit 3 of the
                         Registrant's Amendment No. 1 to Form 8-A filed on Form
                         8-A/A No. 1 on January 7, 1994).

     5.1                 Opinion and Consent of McMahon, Surovik, Suttle,
                         Buhrmann, Cobb & Hicks, P.C.

     8.1                 Opinion and Consent of Armstrong, Backus & Co., L.L.P.

     15.1                Letter from Armstrong, Backus & Co., L.L.P. regarding
                         unaudited interim financial information.

     23.1                Consent of McMahon, Surovik, Suttle, Buhrmann, Cobb &
                         Hicks, P.C. (included in Exhibit 5.1).

     23.2                Consent of Armstrong, Backus & Co., L.L.P. (included in
                         Exhibit 8.1).

     23.3                Consent of Arthur Andersen & Co., independent certified
                         public accountants (auditors for First Financial
                         Bankshares, Inc.).
</TABLE> 

                                      II-2
<PAGE>

<TABLE> 
<S>                      <C> 
     23.4                Consent of Armstrong, Backus & Co., L.L.P., independent
                         certified public accountants (auditors for Concho
                         Bancshares, Inc.).

     24                  Powers of Attorney (see the signature pages to this
                         Form S-4 Registration Statement).

</TABLE> 

     (b)     Financial Statement Schedules.  Schedules have been omitted because
they are not required.

Item 22.     Undertakings.
             ------------ 

     (a)     The undersigned registrant hereby undertakes:

             (1)  To file, during any period in which offers or sales are being
     made, a post-effective amendment to this Registration Statement:

                  (i)   To include any prospectus required by section 10(a)(3) 
             of the Securities Act of 1933, as amended (the "Securities Act");

                  (ii)  To reflect in the prospectus any facts or events arising
             after the effective date of the Registration Statement (or the most
             recent post-effective amendment thereof) which, individually or  in
             the aggregate, represent a fundamental change in the information
             set forth in the Registration Statement; and

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

             (2)  That, for the purpose of determining any liability under the
     Securities Act, each such post-effective amendment shall be deemed to be a
     new registration statement relating to the securities offered therein, and
     the offering of such securities at that time shall be deemed to be the
     initial bona fide offering thereof.

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

     (b)     The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
registrant's annual report pursuant to section 13(a) or section 15(d) of the
Securities Exchange Act of 1934, as amended (the "Exchange Act") (and, where
applicable, each filing of an employee benefit plan's annual report pursuant to
section 15(d) of the Exchange Act) that is incorporated by reference in the
Registration Statement shall be deemed to be a new registration statement
related to the securities

                                      II-3
<PAGE>

offered therein, and the offering of such securities at that time shall be
deemed to be the initial bona fide offering thereof.

     (c)     The undersigned registrant hereby undertakes as follows:  that 
prior to any public reoffering of the securities registered hereunder through
use of a prospectus which is a part of this Registration Statement, by any
person or party who is deemed to be an underwriter within the meaning of Rule
145(c), the issuer undertakes that such reoffering prospectus will contain the
information called for by the applicable registration form with respect to
reofferings by persons who may be deemed underwriters, in addition to the
information called for by the other Items of the applicable form.

     (d)     The undersigned registrant undertakes that every prospectus (i) 
that is filed pursuant to paragraph (c) immediately preceding, or (ii) that
purports to meet the requirements of section 10(a)(3) of the Securities Act and
is used in connection with an offering of securities subject to Rule 415, will
be filed as a part of an amendment to the Registration Statement and will not be
used until such amendment is effective, and that, for purposes of determining
any liability under the Securities Act, each such post-effective amendment shall
be deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

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

     (f)     The undersigned registrant hereby undertakes to respond to requests
for information that is incorporated by reference into the prospectus pursuant
to Items 4, 10(b), 11, or 13 of this Form, within one business day of receipt of
such request, and to send the incorporated documents by first class mail or
other equally prompt means.  This includes information contained in documents
filed subsequent to the effective date of the Registration Statement through the
date of responding to the request.

     (g)     The undersigned registrant hereby undertakes to supply by means 
of a post-effective amendment all information concerning a transaction, and the
company being acquired involved therein, that was not the subject of and
included in the Registration Statement when it became effective.

                                      II-4
<PAGE>

                                  SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Abilene, State of Texas,
on the 10th day of January, 1994.

                                    FIRST FINANCIAL BANKSHARES, INC.



                                    By: /s/ Kenneth T. Murphy
                                       -----------------------------------------
                                       Kenneth T. Murphy, Chairman of the Board,
                                       President and Chief Executive Officer


     The undersigned directors and officers of First Financial Bankshares, Inc.
hereby constitute and appoint Curtis R. Harvey as our true and lawful
attorney-in-fact with full power to execute in our name and behalf in the
capacities indicated below any and all amendments (including post-effective
amendments and amendments thereto) to this Registration Statement and to file
the same, with all exhibits thereto and other documents in connection therewith,
with the Securities and Exchange Commission and hereby ratify and confirm that
such attorney-in-fact shall lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed on the 10th day of January, 1994, by the
following persons in the capacities indicated.

<TABLE> 
<CAPTION> 
Signature                              Title                                
- ---------                              -----                                
                                                                            
<S>                                    <C>                                  
/s/ Curtis R. Harvey                   Executive Vice President and         
- ------------------------------                                              
Curtis R. Harvey                       Chief Financial and Accounting Officer
                                                                            
                                                                            
                                       Director                             
- ------------------------------                                              
J. Allen Baird                                                              
                                                                            
                                                                            
                                       Director                             
- ------------------------------                                              
F. Scott Dueser                                                             
                                                                            
                                                                            
                                       Director                             
- ------------------------------                                              
Patrick N. Gerald                                                           
                                                                            
                                                                            
/s/ Robert E. Hitt                     Director                             
- ------------------------------                                              
Robert E. Hitt                                                              
                                                                            
                                                                            
/s/ Ralph N. Hooks                     Director                             
- ------------------------------                                              
Ralph N. Hooks                                                              
                                                                            
                                                                            
                                       Director                              
- ------------------------------
Joe B. Matthews
</TABLE> 

                                      II-5
<PAGE>

<TABLE> 
<S>                                    <C> 
/s/ Raymond A. McDaniel, Jr.           Director                          
- ------------------------------                                            
Raymond A. McDaniel, Jr.                                                  
                                                                          
                                                                          
/s/ Bynum Miers                        Director                           
- ------------------------------                                            
Bynum Miers                                                               
                                                                          
                                                                          
/s/ Kenneth T. Murphy                  Chairman of the Board, President,  
- ------------------------------                                            
Kenneth T. Murphy                      Chief Executive Officer and Director
                                                                          
                                                                          
/s/ Dian Graves Owen                   Director                           
- ------------------------------                                            
Dian Graves Owen                                                          
                                                                          
                                                                          
/s/ James Parker                       Director                           
- ------------------------------                                            
James Parker                                                              
                                                                          
                                                                          
/s/ W.V. Ramsey, Jr., M.D.             Director                           
- ------------------------------                                            
W.V. Ramsey, Jr., M.D.                                                    
                                                                          
                                                                          
                                       Director                         
- ------------------------------
Craig Smith                                                               
                                                                          
                                                                          
                                       Director
- ------------------------------
H.T. Wilson                                                               
                                                                          
                                                                          
/s/ Stanley P. Wilson                  Director                            
- ------------------------------         
Stanley P. Wilson
</TABLE> 

                                      II-6
<PAGE>


<TABLE> 
<CAPTION> 
                                         
                                             Exhibit Index  
    Item 601
Regulation S-K
Exhibit Reference
    Number                                    Description
- ------------------       -------------------------------------------------------
<S>                      <C> 
     2                   Stock Exchange Agreement and Plan of Organization dated
                         as of December 7, 1993 by and between First Financial
                         Bankshares, Inc., Concho Bancshares, Inc. and Southwest
                         Bank of San Angelo.

     3.1                 Articles of Incorporation, and all amendments thereto,
                         of the Registrant (incorporated by reference from
                         Exhibit 1 of the Registrant's Amendment No. 1 to Form
                         8-A filed on Form 8-A/A No. 1 on January 7, 1994).

     3.2                 Amended and Restated Bylaws of the Registrant, and all
                         amendments thereto (incorporated by reference from
                         Exhibit 2 of the Registrant's Amendment No. 1 to Form
                         8-A filed on Form 8-A/A No. 1 on January 7, 1994).

     4                   Specimen certificate for First Financial Common Stock
                         (incorporated by reference from Exhibit 3 of the
                         Registrant's Amendment No. 1 to Form 8-A filed on Form
                         8-A/A No. 1 on January 7, 1994).

     5.1                 Opinion and Consent of McMahon, Surovik, Suttle,
                         Buhrmann, Cobb & Hicks, P.C.

     8.1                 Opinion and Consent of Armstrong, Backus & Co., L.L.P.

     15.1                Letter from Armstrong, Backus & Co., L.L.P. regarding
                         unaudited interim financial information.

     23.1                Consent of McMahon, Surovik, Suttle, Buhrmann, Cobb &
                         Hicks, P.C. (included in Exhibit 5.1).

     23.2                Consent of Armstrong, Backus & Co., L.L.P. (included in
                         Exhibit 8.1).

     23.3                Consent of Arthur Andersen & Co., independent certified
                         public accountants (auditors for First Financial
                         Bankshares, Inc.).
</TABLE> 

<PAGE>

<TABLE> 
     <S>                 <C> 
     23.4                Consent of Armstrong, Backus & Co., L.L.P., independent
                         certified public accountants (auditors for Concho
                         Bancshares, Inc.).

     24                  Powers of Attorney (see the signature pages to this
                         Form S-4 Registration Statement).

</TABLE> 


<PAGE>

                                                                       Exhibit 2

                           STOCK EXCHANGE AGREEMENT
                          AND PLAN OF REORGANIZATION


     THIS AGREEMENT is made and effective as of this 7th day of December, 1993,
between (1) FIRST FINANCIAL BANKSHARES, INC. (hereinafter referred to as "FIRST
FINANCIAL"), a Texas corporation with its principal office in the City of
Abilene, Taylor County, Texas; (2) CONCHO BANCSHARES, INC. (hereinafter referred
to as "CONCHO"), a Texas corporation and bank holding company with its principal
office in the City of San Angelo, Tom Green County, Texas; and (3) SOUTHWEST
BANK OF SAN ANGELO (hereinafter referred to as "SOUTHWEST BANK"), a Texas state
bank having its principal office in the City of San Angelo, Tom Green County,
Texas.

     First Financial is a registered bank holding company.  First Financial owns
all of the issued and outstanding capital stock of First Abilene Bankshares of
Delaware, Inc. ("FAB DELAWARE") which, in turn, owns all of the issued and
outstanding capital stock of First National Bank of Abilene; First National
Bank, Sweetwater, Texas; Eastland National Bank; Hereford State Bank; First
National Bank in Cleburne; and Stephenville Bank & Trust Company.

     The issued and outstanding stock of Concho, as of the date of this
Agreement, consists of 201,653 shares of common stock (the "CONCHO STOCK")
having a par value of Fifty Cents ($0.50) each.  According to the records of
Concho, the Concho Stock is presently held by those individuals, trusts,
estates, corporations and other entities identified in the Shareholders' List
attached hereto as EXHIBIT A.  This Agreement contemplates the issuance by
                   ---------                                              
Concho of an additional 564 shares of Concho Stock prior to consummation of the
transaction described in this Agreement. As used herein, the term "SHAREHOLDERS"
shall mean not only the individuals, trusts, estates, corporations and other
entities set forth in EXHIBIT A, but also those persons to whom such additional
                      ---------                                                
shares of Concho Stock shall be issued subsequent to the date of this Agreement,
as contemplated hereby.

     Concho owns 119,629 shares (99.7%) of the issued and outstanding capital
stock of Southwest Bank.  It is contemplated by this Agreement that, should the
transaction described herein be consummated, Concho shall own all of the issued
and outstanding capital stock of Southwest Bank.  Southwest Bank is the only
subsidiary of Concho.  Southwest Bank owns all of the issued and outstanding
capital stock of SWB Investment Centre, Inc., a Texas corporation (hereinafter
referred to as "SWB").  There are no other corporations or other business
entities which are considered affiliates of Concho or Southwest Bank.

     Pursuant to, and subject to, the provisions hereinafter set forth, First
Financial agrees to acquire from the Shareholders all of the issued and
outstanding shares of Concho Stock in exchange for shares of the voting common
stock of First Financial ("FIRST FINANCIAL STOCK") which shall be issued and
registered by First Financial under the Securities Act of 1933 (the "ACT").
<PAGE>

     THEREFORE, in consideration of the premises, and in further consideration
of the mutual covenants and on the basis of the representations and warranties
set forth herein, First Financial, Concho and Southwest Bank have agreed, and by
these presents do hereby agree, as follows:


                                   ARTICLE 1

                               EXCHANGE OF STOCK

     1.1  MEANS OF EXCHANGE.  The offer to acquire all of the shares of Concho
          -----------------                                                   
Stock for shares of First Financial Stock shall be made by means of a Prospectus
delivered to each of the Shareholders upon or following the effective date of a
Registration Statement to be filed by First Financial under the Act covering all
of the shares of First Financial Stock to be issued in exchange for the shares
of Concho Stock.

     1.2  RATIO OF EXCHANGE.  Subject to all terms and conditions of this
          -----------------                                              
Agreement, First Financial shall be obligated to issue and exchange 1.15 shares
of First Financial Stock for each share of Concho Stock tendered by the
Shareholders who accept the exchange offer during the time period the exchange
offer is in effect; PROVIDED, HOWEVER, that if First Financial, prior to
consummation of the proposed exchange offer, shall issue any additional shares
of First Financial Stock pursuant to any stock dividend or stock split approved
by the Board of Directors of First Financial, the ratio of exchange shall be
adjusted so as to prevent dilution of the interest in First Financial to be
received by the Shareholders of Concho; FURTHER PROVIDED, the exchange ratio of
1.15 shares of First Financial Stock for each share of Concho Stock shall be
adjusted if, as of December 31, 1993, the Book Value of Concho Stock (as herein
defined) shall be less than $31.25 or if the Market Value of First Financial
Stock (as herein defined) shall be less than $40.00 per share as of the date
which is ten (10) days prior to the later of (i) the date First Financial
receives written notice that the Board of Governors of the Federal Reserve
System has given final approval of the application filed by First Financial to
acquire all of the Concho Stock or (ii) the date upon which the registration
with the Securities and Exchange Commission of the First Financial Stock to be
issued hereunder becomes effective, or if such date be a Saturday, Sunday or
holiday, the next succeeding business day.

     If, as of the date specified in the preceding paragraph of this Section
1.2, the Market Value of First Financial Stock shall be less than $40.00 per
share, then the exchange ratio shall be adjusted by multiplying the exchange
ratio by a fraction, the numerator of which is $40.00 and the denominator of
which is the Market Value of First Financial Stock.  If, as of December 31,
1993, the Book Value of Concho Stock shall be less than $31.25 per share, then
the exchange ratio shall be adjusted by multiplying the exchange ratio by a
fraction, the denominator of which is $31.25 and the numerator of which is the
Book Value of Concho Stock.  If, as of December 31, 1993, the Book Value of
Concho Stock is less than $31.25 and if, as of 
                                 ---                                    

                                     - 2 -
<PAGE>

the date specified in the preceding paragraph of this Section 1.2, the Market
Value of First Financial Stock shall be less than $40.00, the exchange ratio
shall be adjusted by multiplying the exchange ratio of 1.15 by each of the
fractions defined above.

     As used herein, the "MARKET VALUE" of First Financial Stock shall mean the
per share closing bid price of the First Financial Stock in the over-the-counter
market in accordance with quotations supplied by The Principal - Eppler Guerin &
Turner or other authoritative source.  As used herein, the "BOOK VALUE" of
Concho Stock shall mean the consolidated shareholders' equity of Concho
determined in accordance with generally-accepted accounting principles ("GAAP")
divided by the number of issued and outstanding shares of common stock of
Concho; provided, that for purposes of determining the Book Value of Concho
Stock as of December 31, 1993, as required above, the number of issued and
outstanding shares of common stock of Concho shall be deemed to include the 564
new shares of Concho Stock to be issued subsequent to the date of this
Agreement, and also the consideration paid or to be paid for such shares,
irrespective of whether such shares are, in fact, issued and the consideration
therefor paid prior to December 31, 1993.

     1.3  MEANS OF ACCEPTANCE OF EXCHANGE OFFER.  A form of certificate and
          -------------------------------------                            
acceptance of the exchange offer (the "EXCHANGE FORM") shall accompany the
Prospectus delivered to each Shareholder of Concho.  Once the Exchange Form has
been signed by a Shareholder (which shall certify that such Shareholder's stock
is fully paid and non-assessable and is being assigned to First Financial free
and clear of all liens, options and encumbrances), and delivered to the Transfer
Agent named below, the same shall be deemed to constitute an acceptance of the
exchange offer to the extent of the number of shares of Concho Stock
accompanying such Exchange Form.  Shares of Concho Stock delivered by the
Shareholders to the Transfer Agent pursuant to the exchange offer may not be
withdrawn.  If, for any reason, the exchange offer is terminated and the
exchange of Concho Stock for First Financial Stock is not consummated, then all
shares tendered by the Shareholders for exchange shall be promptly returned by
the Transfer Agent.

     1.4  MEANS OF CONSUMMATING THE EXCHANGE.  The Transfer Agent, during the
          ----------------------------------                                 
pendency of the exchange offer, shall notify First Financial and Concho daily of
the number of shares of Concho Stock tendered for exchange under properly
executed Exchange Forms.  If First Financial receives written notice from the
Transfer Agent that the Required Amount of Concho Stock (as herein defined) has
been tendered and assigned to First Financial, then, within ten (10) days after
the Closing Date, First Financial shall issue and mail to those Shareholders who
have tendered their shares of Concho Stock, by registered mail, certificates for
the First Financial Stock representing 1.15 shares of First Financial's stock
for each share of Concho Stock received by the Transfer Agent, or such other
number of shares as may be required under Section 1.2 above.  For purposes of
this Agreement, the "CLOSING DATE" shall be the later of (i) the date First
                                                -----                      
Financial receives notice from the Transfer Agent that the Required Amount of
Concho Stock (as herein defined) has been tendered, (ii) the expiration date of
the exchange 

                                     - 3 -
<PAGE>

offer, or (iii) the date when all conditions precedent to consummation of the
exchange have been satisfied (or, if not satisfied, have been waived in writing
by First Financial).

     Notwithstanding the foregoing provisions of this Section and of Section
1.3, First Financial shall not issue any fractional shares of its common stock.
Shareholders of Concho who would otherwise be entitled to receive fractional
shares of First Financial Stock shall be paid in cash for such fractional shares
based upon the Market Value of First Financial Stock (as defined in Section 1.2)
as of the date specified in the first paragraph of Section 1.2 for determining
such Market Value. Any cash payment to which a Shareholder of Concho may be
entitled shall be included with such Shareholder's certificate for First
Financial Stock when such certificate is mailed to such Shareholder.

     1.5  TRANSFER AGENT.  The Transfer Agent for purposes of this transaction
          --------------                                                      
shall be First National Bank of Abilene - Trust Department, Third Floor, 400
Pine Street, Abilene, Texas 79601.

     1.6  EFFECTIVE DATE OF EXCHANGE OFFER.  The effective date for commencement
          --------------------------------                                      
of the exchange offer (the "EFFECTIVE DATE") contemplated by this Agreement
shall be the later of:

          (A)  The date upon which the Prospectus is mailed by First Financial
     to the Shareholders of Concho pursuant to the Registration Statement (but
     on or following the effective date thereof) filed by First Financial with
     the Securities and Exchange Commission with respect to the First Financial
     Stock to be issued hereunder; or

          (B)  Such other date as may be mutually agreed upon by First Financial
     and Concho.

     1.7  OFFER TERMINATION DATE.  Unless otherwise extended by First Financial,
          ----------------------                                                
the offer by First Financial to exchange its stock for the Concho Stock shall
terminate twenty-one (21) business days after the Effective Date.

     1.8  MERGER.  If the Required Amount of Concho Stock (as herein defined) is
          ------                                                                
tendered in exchange for First Financial Stock, and if all other conditions
precedent to consummation of the exchange are satisfied (or, if not satisfied,
are waived by First Financial) and First Financial shall consummate the exchange
by delivering to the tendering Shareholders the shares of First Financial Stock
(and, with regard to any fractional shares, the cash payments) to which such
Shareholders are entitled hereunder, it is the intent of First Financial to
immediately thereafter merge Concho with and into FAB Delaware pursuant to
applicable law.  If the exchange offer is consummated, but less than all of the
Concho Stock is tendered in exchange for First Financial Stock, then as part of
the proposed merger of Concho into FAB Delaware, those Shareholders of Concho
who did not tender their shares pursuant to the exchange offer made under this
Agreement will be required to accept First Financial Stock (and 

                                     - 4 -
<PAGE>

cash for any fractional shares of First Financial Stock) upon the same basis
(exchange rate and cash) as the exchange of Concho Stock for First Financial
Stock (and cash for fractional shares) will be made under this Agreement,
subject only to the rights, if any, afforded by Delaware or Texas law (whichever
shall apply) to any Shareholders of Concho who dissent from the merger and
refuse to accept First Financial Stock (and cash for fractional shares) in
return for their Concho Stock.


                                   ARTICLE 2

                     CONDITIONS PRECEDENT TO EXCHANGE OFFER
                        AND CONSUMMATION OF TRANSACTION

     Unless otherwise agreed in writing by First Financial and Concho, the
obligations of First Financial to offer First Financial Stock to the
Shareholders pursuant to this Agreement and, thereafter, the obligations of
First Financial and Concho to consummate the exchange of stock contemplated by
this Agreement shall be expressly subject to the satisfaction of the following
conditions:

     2.1  REGULATORY APPROVALS.  (1) The Board of Governors of the Federal
          --------------------                                            
Reserve System shall have approved, in writing, the acquisition by First
Financial of all of the issued and outstanding capital stock of Concho; (2) all
other approvals and authorizations of, filings and registrations with, and
notifications to, all federal, state and local authorities required for the
consummation of the transaction contemplated hereby shall have been obtained or
made and shall be in full force and effect; and (3) all mandatory waiting
periods shall have elapsed.

     2.2  TAX RULINGS.  (1) Concho shall have received a written opinion from
          -----------                                                        
its independent accountants and/or tax counsel stating that the exchange of
their Concho Stock by the Shareholders will not be considered a taxable event
for federal income tax purposes; and (2) First Financial shall have received a
written opinion from its independent accountants, Arthur Andersen & Company, in
form and substance satisfactory to First Financial, stating that the acquisition
by First Financial of the Concho Stock will be treated for accounting purposes
as a "pooling-of-interests".  For purposes of this Agreement, the term "REQUIRED
AMOUNT OF CONCHO STOCK" shall mean that number of shares of Concho Stock (as
determined by First Financial's independent accountants) which must be tendered
by the Shareholders in exchange for First Financial Stock in order for the
acquisition by First Financial to be treated for accounting purposes as a
"pooling-of-interests", and which number of shares, for this purpose of this
transaction, shall be at least 90% of the issued and outstanding shares of
Concho Stock.

     2.3  ACCURACY OF REPRESENTATIONS AND WARRANTIES.  Except as otherwise
          ------------------------------------------                      
expressly provided herein, all of the representations and warranties of First
Financial, Concho and Southwest Bank contained in this Agreement shall be true
on and as of both the Effective Date 

                                     - 5 -
<PAGE>

and the Closing Date, with the same force and effect as though made on the
Effective Date and Closing Date, respectively, and there shall be delivered on
the Effective Date and the Closing Date appropriate certificates of authorized
officers of First Financial, Concho and Southwest Bank to such effect.

     2.4  PERFORMANCE OF AGREEMENTS.  First Financial, Concho and Southwest Bank
          -------------------------                                             
shall have performed all obligations and agreements, and shall have complied
with all covenants and conditions, contained in this Agreement to be performed
and complied with by it or them on or prior to the effective date of the
exchange offer contemplated hereby.

     2.5  NO GOVERNMENTAL PROCEEDING OR LITIGATION.  No order, judgment or
          ----------------------------------------                        
decree of any competent court, governmental body or regulatory authority shall
be outstanding which declares or seeks a declaration that this Agreement is
invalid or which restrains, or seeks to restrain, the consummation of the
exchange offer contemplated hereby; and no action or proceeding shall be pending
which questions the validity or legality of, or seeks to restrain the
consummation of, the exchange offer contemplated by this Agreement.

     2.6  INDEPENDENT AUDIT.  Concho's delivery to First Financial of its
          -----------------                                              
consolidated reports audited by its independent accountants covering the length
of time and prepared in such manner as will satisfy the requirements and
regulations governing the preparation and furnishing of financial statements in
connection with an effective registration with the Securities and Exchange
Commission under the Act of the shares of First Financial Stock to be issued and
exchanged for the Concho Stock.

     2.7  SECURITIES LAWS.  (1) The declaration by the Securities and Exchange
          ---------------                                                     
Commission that the Registration Statement filed by First Financial pursuant to
the Act covering the shares of First Financial stock to be issued pursuant to
this Agreement is effective and the furnishing of a Prospectus to the
Shareholders of Concho; (2) all approvals and authorization of, filings and
registrations with, and notifications to, all regulatory authorities under state
securities or Blue Sky laws required for the offer, sale, exchange or
qualification of the First Financial Stock in connection with the exchange offer
shall have been obtained or made and shall be in full force and effect; (3)
except as reflected in Disclosure Schedule D, First Financial, Concho and
Southwest shall have complied with all federal and state securities laws,
statutes, rules and regulations applicable to the exchange offer contemplated by
this Agreement; and (4) no stop order has been issued or threatened by the SEC
or any state securities authority with respect to the offer, sale, issuance or
exchange of stock contemplated hereby.

     2.8  TENDER OF SHARES.  The delivery by Shareholders owning the Required
          ----------------                                                   
Amount of Concho Stock of duly and properly executed Exchange Forms effectively
transferring and assigning their shares of Concho Stock to First Financial free
and clear of all liens, options and encumbrances and with all of such stock
being fully paid and non-assessable at the time of transfer.

                                     - 6 -
<PAGE>

     2.9  NO MATERIAL CHANGES.  Except as reflected in Disclosure Schedule C,
          -------------------                                                
the absence of any material adverse change in the financial conditions of First
Financial, Concho, Southwest Bank or SWB between July 31, 1993 and the Closing
Date.

     2.10 OPINION OF CONCHO'S COUNSEL.  First Financial shall have received the
          ---------------------------                                          
written opinion of counsel for Concho and Southwest Bank, dated at or as of the
Closing Date and in form and substance satisfactory to First Financial and its
counsel, that Concho, Southwest Bank and SWB have good and merchantable title to
all of their assets and properties; that all shares of Concho Stock, the capital
stock of Southwest Bank and the capital stock of SWB have been validly issued
and are non-assessable and fully paid; that, except as reflected in Disclosure
Schedules B and D, there are no known material liabilities, claims or lawsuits
pending against Concho, Southwest Bank or SWB or any of their respective
properties or assets; that there has been no increase in the number of shares of
Concho Stock issued and outstanding; and that Concho owns all of the issued and
outstanding shares of Southwest Bank capital stock free and clear of all liens,
security interests, transfer restrictions and other encumbrances.

     2.11 OPINION OF FIRST FINANCIAL'S COUNSEL.  Concho shall have received the
          ------------------------------------                                 
written opinion of counsel for First Financial, dated at or as of the Closing
Date and in form and substance satisfactory to Concho and its counsel, that
First Financial is duly organized, validly existing and in good standing under
the laws of the State of Texas; that First Financial has all requisite power and
authority to execute and deliver the Agreement and to consummate the transaction
contemplated thereby; that the execution and delivery by First Financial of the
Agreement does not and the consummation of the transaction contemplated thereby
will not contravene or violate any provision of or constitute a default under
the (a) articles of incorporation or bylaws of First Financial, or (b) any law,
regulation, rule, decree, order or judgment of any court, governmental agency or
public body applicable to First Financial or its assets or properties; and that
all consents, approvals, authorizations, actions or filings with any court,
governmental agency or public body required in connection with the execution,
delivery and performance by First Financial of the Agreement have been obtained.

     2.12 BUILDING/PREMISES.  Concho shall have obtained a written agreement
          -----------------                                                 
signed by the holders of the thirteen (13) individual promissory notes given by
Concho in connection with the purchase by Concho of the third, fourth and fifth
floors (the "CONCHO PROPERTY") of the office tower building in the City of San
Angelo, Tom Green County, Texas, wherein the banking premises of Southwest Bank
are located (Southwest Bank owning the remaining two (2) floors and basement of
the office tower and the land upon which the office tower is located), and
payment of which promissory notes is secured by a deed of trust covering the
Concho Property and further secured by a security interest in, and pledge of,
119,504 shares of Southwest Bank common stock owned by Concho, that the holders
of the notes, immediately following (but subject to) consummation of the stock
exchange offer to be made by First Financial to the Shareholders under this
Agreement, will:

                                     - 7 -
<PAGE>

          (1)  consent to the transfer and conveyance of the Concho Property by
     Concho to Southwest Bank;

          (2)  consent to assumption by Southwest Bank of the obligation to pay,
     in accordance with the terms thereof, the outstanding principal balance,
     plus accrued unpaid interest, due and owing under each and all of the
     thirteen (13) promissory notes;

          (3)  release Concho from any further obligations under or by reason of
     said notes, deed of trust and any other documents or instruments executed
     in connection therewith; and

          (4)  release all liens, security interests and pledges of the
     Southwest Bank common stock held by the holders of said notes to secure
     payment thereof.


                                   ARTICLE 3

          WARRANTIES AND REPRESENTATIONS OF CONCHO AND SOUTHWEST BANK

     Concho and Southwest Bank hereby jointly and severally make the following
warranties and representations to First Financial:

     3.1  ORGANIZATION AND STANDING OF CONCHO.  Concho is a Texas corporation
          -----------------------------------                                
duly organized, validly existing and in good standing under the laws of the
State of Texas, with corporate power to own property and carry on its business
as it is now being conducted.  Concho is also a registered bank holding company
under the Bank Holding Company Act of 1956, as amended.  The copies of the
Articles of Incorporation and Bylaws of Concho, including all amendments
thereto, delivered, or to be delivered, to First Financial are, or will be,
complete and accurate in all respects.

     3.2  ORGANIZATION AND STANDING OF SOUTHWEST BANK.  Southwest Bank is a
          -------------------------------------------                      
state bank duly organized, validly existing and in good standing under the laws
of the State of Texas, with corporate power to own property and carry on its
business as it is now being conducted.  Southwest Bank is an insured bank under
the Federal Deposit Insurance Act.  All of the banking business and all of the
banking offices and facilities of Southwest Bank are located within the State of
Texas.  The copies of the Articles of Association and Bylaws of Southwest Bank,
including all amendments thereto, delivered, or to be delivered, to First
Financial are, or will be, complete and accurate in all respects.

     3.3  SUBSIDIARIES AND AFFILIATES.  Concho does not have any subsidiaries
          ---------------------------                                        
other than Southwest Bank.  Southwest Bank does not have any subsidiary other
than SWB.  Neither 

                                     - 8 -
<PAGE>

Concho, Southwest Bank nor SWB holds any interest in any other corporation,
firm, joint venture or partnership, except (1) as security for repayment of
loans to customers of Southwest Bank, (2) as acquired by Southwest Bank through
foreclosure or otherwise by reason of debt previously contracted, or (3) for
authorized investment securities purchased by Concho or Southwest Bank for its
own account (but, as a result of which investments, neither Concho nor Southwest
Bank is considered to be an affiliate of the issuer of such securities or
otherwise controls, is controlled by or is under common control with, the issuer
of any such investment securities).

     3.4  CAPITALIZATION.  As of the date of this Agreement and the Closing
          --------------                                                   
Date, the authorized capital stock of Concho consists of 500,000 shares of
common stock of a par value of $0.50 each, of which 201,653 are presently issued
and outstanding. Concho also holds 8,478 shares as treasury stock, having
acquired the same in October 1991 in satisfaction of a loan previously
contracted by Southwest Bank.  The authorized capital stock of Southwest Bank
consists of 119,937 shares of common stock of a par value of $10.00, of which
119,937 are presently issued and outstanding; and the authorized capital stock
of SWB consists of 5,000 shares of common stock of a par value of $100.00, of
which 10 are presently issued and outstanding.  Concho now owns all but 308
shares of the issued and outstanding common stock of Southwest Bank, but as of
the Closing Date shall own all of the issued and outstanding common stock of
Southwest Bank.  Southwest Bank owns all of the issued and outstanding common
stock of SWB.  All rights, privileges, restrictions (if any), terms and
provisions governing the shares of common stock of Concho, Southwest Bank and
SWB are described in the Articles of Association and Bylaws (as amended) of
Concho, Southwest Bank and SWB, respectively; and, except for shares of
Southwest Bank pledged to secure the debt of Concho (as described in Section
2.12) or as otherwise reflected in Disclosure Schedule F, there are not (nor
shall be on the Closing Date) any outstanding or authorized subscriptions,
options, warrants, calls, rights or commitments of any kind restricting the
transfer of, requiring the issuance or sale of, or otherwise relating to, any of
the capital stock of Concho, Southwest Bank or SWB.

     3.5  AUTHORITY OF CONCHO AND SOUTHWEST BANK.  This Agreement has been duly
          --------------------------------------                               
executed and delivered by, and has been duly authorized by all necessary
corporate action on the part of, Concho and Southwest Bank, respectively, and,
subject to the conditions precedent to closing of this transaction set forth
herein, is a valid, legally binding and enforceable obligation of Concho and
Southwest Bank. Subject to First Financial's obtaining the approval of the Board
of Governors of the Federal Reserve System, neither the execution, delivery or
performance of this Agreement in its entirety, nor the consummation of all of
the transactions contemplated hereby, will violate (with or without the giving
of notice or the passage of time), be in conflict with, result in a breach of
any provision of, or constitute a default under, any provision in the Articles
of Incorporation, Articles of Association or Bylaws of, or any provision of law
applicable to, Concho, Southwest Bank or SWB, or any agreement or understanding,
order, judgment, award, decree, statute, ordinance, regulation or other
restriction of any kind 

                                     - 9 -
<PAGE>

or character to which Concho, Southwest Bank or SWB is a party or by which any
of the respective assets or properties of Concho, Southwest Bank or SWB are
subject or bound.

     3.6  LICENSES, PERMITS AND CONTRACTS.  To their knowledge, none of the
          -------------------------------                                  
assets, licenses, permits, authorizations and contracts of Concho, Southwest
Bank or SWB will be terminated or impaired by reason of execution, delivery or
performance by Concho or Southwest Bank of this Agreement or consummation of the
transactions contemplated hereby.

     3.7  CLAIMS, SUITS AND PROCEEDINGS.  Except as reflected in Disclosure
          -----------------------------                                    
Schedule D, there are no actions, suits, proceedings or claims pending or, to
their knowledge, threatened against Concho, Southwest Bank or SWB, at law or in
equity, or before any federal, state, municipal or other governmental court,
department, commission, board, bureau, agency, instrumentality or other person
which would result in liability to Concho, Southwest Bank or SWB upon
consummation of the transaction contemplated hereby or which would prevent or
delay such consummation.  In particular, and without in any way limiting the
foregoing, neither Concho, Southwest Bank nor SWB is subject to, or a party to,
any cease-and-desist, supervisory or other agreement with any banking or other
regulatory authority which requires the consent or approval of such authority or
which is otherwise applicable to the transaction contemplated by this Agreement.

     3.8  CONSENTS AND APPROVALS.  No consent, approval or authorization of, or
          ----------------------                                               
declaration, filing or registration with, any person or governmental authority
is required in connection with the execution and delivery of this Agreement by
Concho or Southwest Bank, and consummation of the transactions contemplated
hereby, except for (1) such approvals as may be required for First Financial to
acquire the Concho Stock and for such approvals by the Boards of Directors of
Concho and Southwest Bank as have been given prior to execution of this
Agreement and (2) such approvals and consents as may be required in order to
obtain and carry out the agreement described in Section 2.12 relative to the
Concho Property and the indebtedness secured thereby.

     3.9  REGULATORY REPORTS.  To their knowledge, Concho, Southwest Bank and
          ------------------                                                 
SWB have filed all reports, registrations and statements, together with any
amendments required to be made thereto, that are required to be filed with the
Federal Reserve Board (the "FRB"), Texas Department of Banking (the "TDB"), the
Federal Deposit Insurance Corporation (the "FDIC"), the Securities and Exchange
Commission (the "SEC") and any other applicable authorities, and all of such
reports, registrations and statements are true, complete and correct in all
material respects.

     3.10 FINANCIAL STATEMENTS.  Concho and Southwest Bank have provided,or
          --------------------                                             
caused to be provided, to First Financial the Financial Statements and Reports
described in Disclosure Schedule A attached hereto and the notes thereto
(collectively, the "FINANCIAL STATEMENTS"), all of which have been prepared in
accordance with generally accepted accounting principles 

                                     - 10 -
<PAGE>

("GAAP") or regulatory accounting principles ("RAP"); and the Financial
Statements, as of their respective dates, conformed in all material respects
with all applicable material rules and regulations promulgated by the FRB, the
TDB and the FDIC.

     3.11 UNDISCLOSED LIABILITIES.  To their knowledge, and except to the extent
          -----------------------                                               
reflected in the Financial Statements or as reflected in Disclosure Schedule B,
Concho, Southwest Bank and SWB have no material liabilities or obligations
(absolute, accrued, contingent or otherwise).

     3.12 ABSENCE OF CERTAIN CHANGES.  Except as and to the extent reflected in
          --------------------------                                           
Disclosure Schedule C, neither Concho, Southwest Bank nor SWB has, from July 31,
1993, until the date of this Agreement:

          (A)  made any amendment to its articles of association or by-laws or
     changed the character of its business in any material manner;

          (B)  suffered any material adverse change in its financial condition,
     assets, liabilities (absolute, accrued, contingent or otherwise) or
     business;

          (C)  incurred, assumed or become subject to, whether directly or by
     way of any guarantee or otherwise, any obligations or liabilities
     (absolute, accrued, contingent or otherwise) except in the ordinary course
     of business;

          (D)  permitted or allowed any of its property or assets to be subject
     to any mortgage, pledge, lien, security interest, encumbrance, restriction
     or change of any kind;

          (E)  cancelled any debts in excess of $25,000, waived any claims or
     rights of material value, or sold, transferred, or otherwise disposed of
     any of its properties or assets, except in the ordinary course of business;

          (F)  other than in the ordinary course of business, disposed of or
     permitted to lapse any rights to the use of any material trademark, trade
     name or copyright, or disposed of or disclosed to any person other than its
     employees any material trade secret not theretofore a matter of public
     knowledge;

          (G)  granted any increase in compensation, or paid or agreed to pay or
     accrue any bonus or like benefit, to or for the credit of any director,
     officer or employee except in the ordinary course of business, or entered
     into any employment or consulting contract or other agreement for personal
     services with any director, officer or employee, or adopted, amended or
     terminated any Employee Benefit Plan, except as authorized by Section 4.3;

                                     - 11 -
<PAGE>

          (H)  declared, paid or set aside for payment any dividend or other
     distribution or payment in respect of its capital stock [other than (i)
     normal, regular dividends or distributions of SWB to Southwest Bank and
     Southwest Bank to Concho, and (ii) Concho's regular annual cash dividend of
     $0.25 per share payable to its Shareholders], or directly or indirectly
     redeemed, purchased or otherwise acquired, or arranged for the redemption,
     purchase or acquisition of, any shares of its capital stock or other of its
     securities;

          (I)  organized or acquired, except through foreclosure, the exercise
     of creditors remedies or in a fiduciary capacity, any capital stock or
     other equity securities of any corporation or acquired any equity or
     ownership interest in any partnership or business enterprise;

          (J)  issued, reserved for issuance, granted, or authorized the
     issuance of any shares of its capital stock or subscriptions, options,
     warrants, calls, rights or commitments of any kind relating to the issuance
     of or conversion into shares of its capital stock, except for the 564 new
     shares of Concho Stock to be issued by Concho in order to acquire the
     remaining shares of Southwest Bank stock not previously owned by Concho;

          (K)  made any change in any method of accounting or accounting
     practice, except as required by applicable law, regulation or GAAP;

          (L)  except for the transactions contemplated by this Agreement, or as
     otherwise permitted hereunder, entered into any transaction, or entered
     into, modified or amended any contract or commitment, other than in the
     ordinary course of business; or

          (M)  agreed, whether in writing or otherwise, to take any action the
     performance of which would be prohibited by this Section 3.12.

     3.13 TITLE TO PROPERTIES; ENCUMBRANCES.  Except for the deed of trust,
          ---------------------------------                                
mortgage, liens and security interests described in Section 2.12 securing the
indebtedness described therein, Concho, Southwest Bank and SWB have, or will
have upon the Closing Date, unencumbered, good and merchantable title to all
their properties and assets, real and personal, including, without limitation,
all properties and assets reflected in the Financial Statements, except for (i)
easements, reservations, restrictions, rights-of-way, and other encumbrances of
record, other than liens and conveyances, and (ii) those properties and assets
disposed of in the ordinary course of business consistent with safe and sound
banking practices; and, to their knowledge, all uses made of, and activities
conducted upon, any real property owned, leased or used by Concho, Southwest
Bank and/or SWB comply in all respects with applicable state, local or municipal
zoning laws and other laws, rules, regulations and ordinances.

                                     - 12 -
<PAGE>

     3.14 LITIGATION.  Except as reflected in Disclosure Schedule D, there are
          ----------                                                          
no actions, suits, proceedings or claims pending or, to their knowledge,
threatened against Concho, Southwest Bank or SWB, or involving any of their
properties or assets, at law or in equity, or before or by any foreign, federal,
state, municipal or other governmental court, department, commission, board,
bureau, agency, instrumentality or other person, which may, in the reasonable
judgment of Concho, Southwest Bank or SWB, result in any material liability to
Concho, Southwest Bank or SWB.

     3.15 TAX MATTERS.  Concho, Southwest Bank and SWB have each:
          -----------                                            

          (A)  duly filed all tax returns (the "FILED RETURNS") required to be
     filed by it involving a tax liability or other material potential detriment
     for failure to file, and all of such Filed Returns are true, complete and
     correct in all material respects;

          (B)  paid, or established reasonable reserves for the payment of, all
     federal income taxes and all state and local income taxes and all
     franchise, property, sales, employment or other taxes required to be paid
     in respect to the periods covered by the Filed Returns;

          (C)  with respect to the periods prior to the date of this Agreement
     and subsequent to the last Filed Return, established reasonable reserves
     for the payment of all federal income taxes and all material state and
     local income taxes and all material franchise, property, sales, employment
     or other taxes; and

          (D)  properly and timely withheld, remitted and/or paid all
     withholding taxes, social security taxes, unemployment taxes and other
     employment-related taxes which Concho, Southwest Bank and SWB are, by law,
     required to withhold, remit or pay.

     In addition to the foregoing, neither Concho, Southwest Bank nor SWB (1) is
the subject of, nor is there pending or threatened, any audit with respect to or
arising out of any Filed Return; (2) has previously requested, or has filed a
request for, any extension of time to file any return or pay any tax; and (3)
has agreed or consented to the extension of any statute of limitations
respecting the assessment of taxes, additional taxes, penalty or interest in
connection with any tax liability or Filed Return.  No tax liens have been filed
or threatened against Concho, Southwest Bank or SWB or any of their properties.

     For the purpose of this Agreement, the term "TAX" shall include all
federal, state and local taxes and related governmental charges and any interest
or penalties payable in connection with the payment of taxes.

     3.16 EMPLOYMENT BENEFIT PLANS.  Except as reflected in Disclosure Schedule
          ------------------------                                             
E, neither Concho, Southwest Bank nor SWB maintains or contributes to, nor is
Concho, Southwest 

                                     - 13 -
<PAGE>

Bank or SWB required to maintain or contribute to, (1) any "employee welfare
benefit plan" [as defined in Section 3(1) of the Employee Retirement Income
Security Act ("ERISA")] or (2) any "employee pension benefit plan" [as defined
in Section 3(2) of ERISA].  Except as reflected in Disclosure Schedule E,
neither Concho, Southwest Bank nor SWB maintains or contributes to, nor has
Concho, Southwest Bank or SWB adopted or entered into, any deferred compensation
plan, bonus plan, stock option plan, employee stock option plan or any other
employee benefit plan, agreement, arrangement or commitment (other than normal
policies concerning holidays, vacations, accumulated sick leave, and annual
budgeted incentive bonuses previously disclosed to First Financial.)

     3.17 LEASES, CONTRACTS AND AGREEMENTS.  Disclosure Schedule F reflects all
          --------------------------------                                     
leases, contracts and agreements to which Concho, Southwest Bank or SWB is a
party and which obligate or may obligate Concho, Southwest Bank or SWB to pay
any amount in excess of $25,000 over the entire term of any such lease, contract
or agreement (the "CONTRACTS"), true and correct copies of which have been or
shall be made available to First Financial.  For the purposes of this Agreement,
the Contracts shall not be deemed to include loan commitments of, loans made by,
repurchase agreements made by, bankers acceptances of, or deposits taken by
Southwest Bank in the ordinary course of its banking business.  Each and all of
the Contracts are legal, valid, binding and enforceable in accordance with their
terms and are in full force and effect.  To their knowledge, there are no
existing material defaults by any party to the Contracts and no event has
occurred which (whether with or without notice, lapse of time or the happening
or occurrence of any other event) would constitute such default.

     3.18 RELATED COMPANY TRANSACTIONS.  Except for transactions described in
          ----------------------------                                       
Disclosure Schedule G, there are no agreements, instruments, commitments,
extensions of credit, tax sharing or allocation agreements or other contractual
agreements of any kind between Concho, Southwest Bank and/or SWB.

     3.19 TRANSACTIONS WITH AFFILIATES.  Except as reflected in Disclosure
          ----------------------------                                    
Schedule H, neither Concho, Southwest Bank nor SWB (1) has any loans outstanding
to any of its affiliates, executive officers, or directors, or to any
shareholder owning ten percent (10%) or more of its outstanding shares or (2) is
a party to, or otherwise bound by, any contractual agreement with any of its
affiliates, executive officers, or directors, or with any shareholder owning ten
percent (10%) or more of its outstanding shares.

     3.20 COMPLIANCE WITH LAWS.  To their knowledge, and except as otherwise
          --------------------                                              
disclosed in Disclosure Schedule I, Concho, Southwest Bank and SWB are in
compliance in all material respects with all applicable laws and regulations and
no action is pending or threatened against Concho, Southwest Bank or SWB by any
federal, state or other regulatory authority.

     3.21 ACCURACY OF INFORMATION.  The factual information relating to Concho,
          -----------------------                                              
Southwest Bank and SWB contained in this Agreement and the Disclosure Statements
hereto is, to their 

                                     - 14 -
<PAGE>

knowledge, true, correct and complete in all material respects. The information
relating to Concho, Southwest Bank and SWB supplied for inclusion in the
application of First Financial to the FRB, the Registration Statement filed by
First Financial with the SEC and the Prospectus to be delivered by First
Financial to each of the Shareholders of Concho, as of the date supplied by
Concho and Southwest Bank, will be true, correct and complete in all material
respects.

     3.22 INSURANCE.  Concho, Southwest Bank and SWB have in effect the
          ---------                                                    
insurance coverage described in Disclosure Schedule J.  All insurance policies
described in Disclosure Schedule J are in full force and effect; no breach or
default exists under any such policy; and Concho, Southwest Bank and SWB have
timely filed all claims, if any, under any such insurance policy.

     3.23 LOANS.  To their knowledge, each loan reflected as an asset in the
          -----                                                             
Financial Statements, as well as all other extensions of credit, guarantees,
security agreements, deeds of trust and other documents and instruments executed
in connection therewith (whether intended as security or otherwise) is the
legal, valid and binding obligation of the obligor named therein and is
enforceable in accordance with its terms.  Concho and Southwest Bank have made
available to First Financial all material information in possession of Concho
and Southwest Bank concerning all outstanding loans of Concho and Southwest
Bank.

     3.24 FIDUCIARY RESPONSIBILITIES.  To their knowledge, Concho, Southwest
          --------------------------                                        
Bank and SWB have each performed in all material respects all of its duties as a
trustee, executor, grantor, escrow agent or other fiduciary in a manner which
complies in all material respects with all applicable laws, regulations, orders,
agreements, instruments and common law standards.

     3.25 REGULATORY ACTIONS.  Except as disclosed in Disclosure Schedule K,
          ------------------                                                
there are no actions or proceedings pending or, to their knowledge, threatened
against Concho, Southwest Bank or SWB by or before the FRB, the TDB, the FDIC,
the SEC or any other governmental agency or authority.

     3.26 BROKER'S FEES.  No person or entity acting on behalf of Concho,
          -------------                                                  
Southwest Bank or SWB is or shall be entitled, directly or indirectly, to any
brokerage fee, commission, finder's fee or financial advisory fee in connection
with the transaction contemplated by this Agreement.

     3.27 ENVIRONMENTAL MATTERS.  To their knowledge, and except as disclosed in
          ---------------------                                                 
Disclosure Schedule L, there are no material adverse environmental problems or
conditions affecting any of the properties of Concho, Southwest Bank or SWB.  In
particular, and without in any way limiting the foregoing, Concho, Southwest
Bank and SWB, after due inquiry, warrant and represent that all hazardous and
toxic chemicals, substances and materials located or used upon any of their
respective properties have been and are being stored, used, transported and
disposed of in compliance with applicable state and federal environmental laws;
that there are no underground storage tanks located upon any of their
properties; and that no action or 

                                     - 15 -
<PAGE>

investigation is pending or threatened by any governmental or regulatory
authority, or by any person, firm or corporation, arising out of any failure, or
alleged failure, to comply with applicable environmental laws, statutes, rules
or regulations.


                                 ARTICLE 4

                 CONDUCT OF BUSINESS OF CONCHO, SOUTHWEST BANK
                          AND SWB PENDING CLOSING DATE

        4.1  AFFIRMATIVE COVENANTS.  From and after the date of this Agreement
             ---------------------                                            
and until the Closing Date, Concho and Southwest Bank shall each, and each of
them shall cause SWB to:

          (A)  operate and conduct its business in the ordinary course and
     consistent with its prior practices;

          (B)  preserve intact its corporate existence, business organization,
     assets, licenses, permits, authorizations, and business opportunities;

          (C)  maintain its books, accounts and records in accordance with
     generally accepted accounting principles and/or banking practices, as
     applicable, and comply with all of its contractual obligations;

          (D)  maintain all of its properties in good repair, order and
     condition, reasonable wear and tear excepted, and maintain insurance
     coverage upon all such properties with reputable insurers which are
     adequate, in its reasonable judgment, for the business conducted by it;

          (E)  in good faith and in a timely manner (i) cooperate with First
     Financial in satisfying the conditions in this Agreement; (ii) diligently
     assist First Financial, to the extent it may reasonably require, in
     obtaining as promptly as possible all consents, approvals, authorizations
     and rulings, whether regulatory or corporate, as are necessary for First
     Financial to carry out and consummate the transaction contemplated by this
     Agreement; (iii) furnish, or cause to be furnished, to First Financial such
     information as First Financial may reasonably require for inclusion in any
     filings or applications that may be necessary in that regard; and (iv)
     perform all acts and execute and deliver all documents reasonably necessary
     to cause the transaction contemplated by this Agreement to be consummated
     at the earliest possible date;

          (F)  timely file with the FRB, TDB, FDIC, SEC and other regulatory
     authorities all financial statements and other reports to be filed by it
     and promptly 

                                     - 16 -
<PAGE>

     thereafter deliver to First Financial copies of all financial statements
     and other reports required to be so filed;

          (G)  comply with all applicable laws and regulations, noncompliance
     with which would have a material adverse effect upon its financial
     condition, assets, liabilities (absolute, accrued, contingent or otherwise)
     or business; and

          (H)  promptly give written notice to First Financial upon obtaining
     knowledge of any event or fact that would cause any of the representations
     or warranties of Concho or Southwest Bank contained in or referred to in
     this Agreement to be untrue in any material respect, and use its best
     efforts to prevent or promptly remedy the same.

     4.2  NEGATIVE COVENANTS.  Except with the written consent of First
          ------------------                                           
Financial, neither Concho nor Southwest Bank shall, and neither of them shall
permit SWB to, from the date of this Agreement and until the Closing Date,

          (A)  make or permit any amendment to its Articles of Association or
     By-laws;

          (B)  make or permit any changes in allocating or charging costs which
     in the aggregate would cause a material detriment, except as may be
     required by applicable regulation or GAAP, and after notice to First
     Financial;

          (C)  except for negotiations and discussions between the parties
     hereto relating to the transactions contemplated by this Agreement, (i)
     directly or indirectly initiate contact with any person or entity in an
     effort to solicit an acquisition, merger or consolidation proposal relating
     to Concho, Southwest Bank or SWB, (ii) enter into negotiation of the terms
     of an agreement relating to the acquisition, merger or consolidation of
     Concho, Southwest Bank or SWB, (iii) permit access to the premises of
     Concho, Southwest Bank or SWB for the review of its business or operations
     (except as required by law), (iv) except in the ordinary course of
     business, enter into any oral or written agreement to sell the assets of
     Concho, Southwest Bank or SWB or to merge, consolidate, liquidate or
     dissolve Concho, Southwest Bank or SWB, or (v) authorize or engage any
     officer, employee, agent or representative of Concho, Southwest Bank or SWB
     (including but not limited to investment bankers and financial advisers) to
     enter into any such solicitation, negotiation or any such oral or written
     agreement;

          (D)  make any change in the number of shares of its capital stock
     issued and outstanding, or issue, reserve for issuance, grant, or authorize
     the issuance of any shares of their capital stock or subscriptions,
     options, warrants, calls, rights or commitments of any kind relating to the
     issuance or conversion into shares of their capital stock, other than the
     564 new shares of Concho Stock to be issued by Concho to acquire the
     remaining stock of Southwest Bank;

                                     - 17 -
<PAGE>

          (E)  incur, assume or become subject to, whether directly or by way of
     any guarantee or otherwise, any obligation or liability (absolute, accrued,
     contingent or otherwise) except in the ordinary course of business;

          (F)  permit or allow any of its property or assets to become subject
     to any mortgage, pledge, lien, security interest or encumbrance,
     restrictions or change of any kind;

          (G)  cancel any debts in excess of $25,000.00, waive any claims or
     rights of material value or sell, transfer, or otherwise dispose of any of
     its properties or assets, except in the ordinary course of business;

          (H) other than in the ordinary course of business, dispose of or
     permit to lapse any of its rights to the use of any material trademark,
     trade name or copyright, or dispose of or disclose to any person any
     material trade secret not theretofore a matter of public knowledge;

          (I)  except in the ordinary course of business, grant or permit any
     increase in compensation, or pay or agree to pay or accrue any bonus or
     like benefit, to or for the credit of any its directors, officers or
     employees, or enter into, or permit, of any employment or consulting
     agreement or other agreement for personal services with any of its
     directors, officers or employees, or adopt, amend or terminate any Employee
     Benefit Plan or change or modify the period of vesting or retirement age
     for any participant of any such plan (except as required by or to comply
     with any law or regulation);

          (J)  declare, pay or set aside for payment any dividend or other
     distribution or payment in respect of shares of its capital stock except
     for (i) normal, regular dividends or other distributions of SWB to
     Southwest Bank and Southwest Bank to Concho, and (ii) Concho's regular
     annual cash dividend of $0.25 per share payable to its Shareholders;

          (K)  acquire the capital stock or other equity securities of any
     corporation or any equity or ownership interest in any partnership or other
     business enterprise, except through foreclosure, the exercise of creditors'
     remedies or in a fiduciary capacity;

          (L)  make aggregate capital expenditures and commitments in excess of
     $50,000 for additions to its premises or equipment;

          (M)  except as disclosed in Disclosure Schedule M, modify any
     outstanding loans, make any new loans or acquire any loan participations,
     unless such modifications, new loans, or participations are made in the
     ordinary course of business; or

                                     - 18 -
<PAGE>

          (N)  knowingly do, or cause or permit to be done, or knowingly take,
     or cause or permit to be taken, any action that would disqualify the
     acquisition by First Financial of the Concho Stock to be treated for
     accounting purposes on a pooling-of-interests basis.

     4.3  CERTAIN ACTIVITIES IN ORDINARY COURSE.  For the purposes of Section
          -------------------------------------                              
4.2(i), it shall be considered to be in the ordinary course of business for
Southwest Bank and SWB to award reasonable bonuses for 1993, to grant reasonable
salary increases to officers and employees for 1994, and make its usual and
customary matching contribution to contributions made by employees of Concho,
Southwest Bank or SWB under its or their 401(k) Plan, but First Financial shall
be notified in writing of any such increases, bonuses or contributions to be
paid after the date of this Agreement.

     4.4  COVENANTS.  From and after the date of this Agreement and until
          ---------                                                      
consummation or termination of the transaction contemplated by this Agreement,
neither Concho nor Southwest Bank shall, nor shall Concho or Southwest Bank
cause or permit SWB to, take any action which would cause Concho or Southwest
Bank to be in breach of any of the covenants contained in this Article 4; and
Concho and Southwest Bank shall, within their ability to do so, cause Concho,
Southwest Bank and SWB to keep and perform all of the covenants contained in
this Article 4.


                                   ARTICLE 5

                          WARRANTIES, REPRESENTATIONS
                        AND COVENANTS OF FIRST FINANCIAL

     First Financial warrants and represents to, and covenants and agrees with,
Concho and Southwest Bank as follows:

     5.1  ORGANIZATION AND STANDING OF FIRST FINANCIAL.  First Financial is a
          --------------------------------------------                       
corporation duly organized, validly existing, and in good standing under the
laws of the State of Texas, with corporate power to own property and carry on
its business as it is now being conducted.

     5.2  CAPITALIZATION.  First Financial has an authorized capitalization of
          --------------                                                      
5,000,000 shares of common stock of the par value of $10.00 per share, of which
3,741,802 shares are issued, outstanding, and fully paid as of the date of this
Agreement.

     5.3  AUTHORITY OF FIRST FINANCIAL.  This Agreement has been duly executed
          ----------------------------                                        
and delivered by First Financial and, subject to the conditions precedent to
Closing of the transactions set forth herein, is a valid, legally binding and
enforceable obligations of First Financial.  Neither the execution, delivery or
performance of this Agreement in its entirety, nor the consummation of all of
the transactions contemplated hereby, will violate (with or without the giving
of notice or the passage of time), be in conflict with, result in a breach of
any 

                                     - 19 -
<PAGE>

provision of, or constitute a default under, any provision of law applicable to
First Financial, or any agreement or understanding, order, judgement, award,
decree, statute, ordinance, regulation or other restriction of any kind or
character to which First Financial is a party or by which any of its or their
assets or properties is subject or bound.  There are no actions, suits,
proceedings or claims pending or, to its knowledge, threatened against First
Financial, at law or in equity, or before or by any foreign, federal, state,
municipal or other government court, department, commission, board, bureau,
agency, instrumentality or other person which may result in liability to or of
First Financial upon the consummation of the transactions contemplated hereby or
which would prevent or delay such consummation.

     5.4  NO ADVERSE CHANGE.  From the date of this Agreement until the Closing
          -----------------                                                    
Date, First Financial shall not have suffered any material adverse change in its
financial condition, assets, liabilities (absolute, accrued, contingent or
otherwise) or business.

     5.5  DUE DILIGENCE.  The officers, employees or other representatives of
          -------------                                                      
First Financial have reviewed and examined the assets, property (real and
personal), leases and all other contractual arrangements to which Concho,
Southwest Bank or SWB is a party and all business records of Concho, Southwest
Bank and SWB, including, but not limited to, committee and directors' minutes,
reports of condition, reports of income, tax returns, deposit agreements, loan
portfolios, documents pertaining to legal matters, and financial statements, all
of which review and examination was conducted upon the premises of Concho,
Southwest Bank or SWB and First Financial hereby confirms the acceptability of
such due diligence review.

     5.6  COVENANTS.  First Financial covenants and agrees that it shall:
          ---------                                                      

          (A)  use its best efforts in good faith and in a timely manner to (i)
     cooperate with Concho and Southwest Bank in satisfying the conditions in
     this Agreement, (ii) obtain as promptly as possible all consents,
     approvals, authorizations and rulings, whether regulatory or corporate, as
     are necessary for First Financial to carry out and consummate the
     transactions contemplated by this Agreement, including specifically (but
     without limitation) the approval called for by Section 5.5, and (iii)
     furnish information concerning First Financial and its subsidiaries not
     previously provided to Concho and Southwest Bank required for inclusion in
     any filing or applications that may be necessary in that regard;

          (B)  perform all acts and execute and deliver all documents necessary
     to cause the transactions contemplated by this Agreement to be consummated
     at the earliest possible date;

          (C)  promptly give written notice to Concho upon obtaining knowledge
     of any event or fact that would cause any of the representations or
     warranties of First Financial 

                                     - 20 -
<PAGE>

     contained in or referred to in this Agreement to be untrue in any material
     respect, and use its best efforts to prevent or promptly remedy the same;
     and

          (D)  cause its officers, directors and representatives to treat as
     confidential any and all information concerning Concho, Southwest Bank or
     SWB which is furnished to First Financial, its directors, officers,
     employees, shareholders, agents, representatives or advisors, in connection
     with this Agreement, or which was furnished prior to the execution of this
     Agreement for the purpose of First Financial reviewing and evaluating the
     transaction contemplated by this Agreement, except insofar as disclosure to
     certain parties is necessary to meet the conditions of this Agreement.  In
     the event this Agreement is terminated pursuant to Section 7.1 prior to the
     consummation of the transaction, First Financial shall promptly return to
     Concho, Southwest Bank or SWB all written material containing or reflecting
     such confidential information, and in such event, the covenants of First
     Financial with respect to such confidential information contained in this
     Section 5.4(d) shall survive such termination.

     5.7  FEDERAL RESERVE APPROVAL.  Specifically, but without limiting the
          ------------------------                                         
effect of Section 5.6, promptly upon execution of this Agreement, First
Financial shall make application to the Board of Governors of the Federal
Reserve System (the "FRB") for prior approval to acquire the Concho Stock in
accordance with this Agreement as required by the Bank Holding Company Act of
1956, as amended, and applicable regulations.  Promptly upon receipt, First
Financial shall furnish Concho and Southwest Bank with a copy of the notice of
approval or disapproval of the application made by it to the FRB.

     5.8  SEC REGISTRATION.  Without limiting the effect of Section 5.6, upon
          ----------------                                                   
execution of this Agreement, First Financial shall proceed to file a
Registration Statement with the Securities and Exchange Commission pursuant to
the Act covering the shares of First Financial Stock to be issued pursuant to
this Agreement. Promptly upon receipt of such declaration of the effectiveness
of such Registration Statement from the Securities and Exchange Commission,
First Financial shall furnish Concho and Southwest Bank with a copy of the
approval or disapproval of the effectiveness of such Registration Statement.


                                   ARTICLE 6

             SURVIVAL OF WARRANTIES, INDEMNIFICATION AND LIABILITY

     6.1  NATURE AND SURVIVAL OF REPRESENTATIONS AND WARRANTIES.  The covenants,
          -----------------------------------------------------                 
representations and warranties of the parties hereto shall survive the Closing
Date.

                                     - 21 -
<PAGE>

                                   ARTICLE 7

                                  TERMINATION

     7.1  CIRCUMSTANCES AUTHORIZING TERMINATION.  Notwithstanding anything
          -------------------------------------                           
herein to the contrary, this Agreement may be terminated and the Exchange Offer
contemplated hereby may be abandoned at any time, but prior to the Closing Date:

          (A)  by mutual written consent duly authorized by the Boards of
     Directors of First Financial and Concho;

          (B)  by First Financial (i) if First Financial learns or becomes aware
     of a state of facts or breach or inaccuracy of any representation or
     warranty or covenant of Concho contained in Articles 3 or 4 which
     constitute a material adverse change from that represented in this
     Agreement, or (ii) if any of the conditions to Closing contained in Article
     2 are not satisfied or waived in writing by First Financial;

          (C)  by Concho (i) if Concho learns or becomes aware of a state of
     facts or breach or inaccuracy of any representation or warranty or covenant
     of First Financial contained in Article 5 which constitutes a material
     adverse change from that represented in this Agreement, or (ii) if any of
     the conditions to Closing contained in Article 2 are not satisfied or
     waived in writing by Concho;

          (D)  by First Financial or Concho if the Effective Date shall not have
     occurred on or before April 30, 1994 or such later date agreed to in
     writing by First Financial or Concho; or

          (E)  by First Financial or Concho if any court of competent
     jurisdiction in the United States (federal or state) or other governmental
     body shall have issued an order, decree or ruling or taken any other action
     restraining, enjoining or otherwise prohibiting the exchange of shares or
     the merger, and such order, decree, ruling or other action shall have been
     final and nonappealable.


                                   ARTICLE 8

                            MISCELLANEOUS PROVISIONS

     8.1  PUBLIC ANNOUNCEMENTS.  Prior to the Closing Date, neither Concho,
          --------------------                                             
Southwest Bank nor First Financial, nor any person affiliated with any of them,
shall, without the prior approval of the other parties, make any written public
announcement, make any written statement or release to the press, or make any
written statement to a competitor, customer or 

                                     - 22 -
<PAGE>

other third party (except to their respective counsel or to regulatory
authorities in connection with applications for governmental approvals) with
respect to this Agreement or the transactions contemplated hereby.

     8.2  APPLICABLE LAW.  This Agreement and the legal relations between the
          --------------                                                     
parties hereto shall be governed by and construed in accordance with the laws of
the State of Texas and of the United States of America.

     8.3  PARAGRAPH AND OTHER HEADINGS.  Article and section headings contained
          ----------------------------                                         
in this Agreement are for reference purposes only and shall not affect the
meaning or interpretation of this Agreement.

     8.4  WAIVERS AND AMENDMENTS.  This Agreement may be amended, modified or
          ----------------------                                             
supplemented only by a written instrument executed by the parties hereto.  The
waiver by any party hereto of a breach of any provision of this Agreement shall
not operate or be construed as a waiver of any subsequent breach.

     8.5  EXPENSES.
          -------- 

          (A)  Whether or not the transactions contemplated by this Agreement
     are consummated, each of the parties shall be responsible for their
     respective fees and expenses incident to the negotiation, preparation,
     execution and consummation of the transactions contemplated by this
     Agreement, including attorneys' and accountants' fees and expenses.

          (B)  First Financial consents to payment by Concho, Southwest Bank and
     SWB of attorneys' and accountants' fees incurred by them incident to the
     negotiation, preparation and execution of this Agreement and consummation
     of the transaction contemplated by this Agreement.

     8.6  ENTIRE AGREEMENT.  This Agreement, including the Exhibits and
          ----------------                                             
Disclosure Schedules, embodies the entire agreement and understanding of the
parties with respect to the subject matter contained herein.  There are no
restrictions, promises, representations, warranties, covenants or undertaking
other than those expressly set forth or referred to herein.

     8.7  NOTICES.  All notices, requests, demands or other communications which
          -------                                                               
are required or may be given under this Agreement shall be in writing and shall
be deemed to have been duly given if delivered personally or sent by registered
or certified mail, return receipt requested, postage prepaid:

                                     - 23 -
<PAGE>

          (A)  In the case of First Financial, to:

               Mr. Kenneth T. Murphy
               Chairman of the Board, President and Chief Executive Officer
               First Financial Bankshares, Inc.
               P. O. Box 701
               Abilene, Texas  79604

          with a copy to:

               Mr. David L. Buhrmann
               McMahon, Surovik, Suttle, Buhrmann,
                 Cobb & Hicks
               P. O. Box 3679
               Abilene, Texas  79604

          (B)  In the case of Concho and/or Southwest Bank, to:

               Mr. David B. Drake
               Chairman and Chief Executive Officer
               Concho Bancshares, Inc.
               P. O. Box 60410
               San Angelo, Texas  76906

          with a copy to:

               Patrick J. Kennedy, Jr.
               Kennedy & Baris, L.L.P.
               1775 NBC Plaza
               112 East Pecan Street
               San Antonio, Texas  78205

     or to such other addresses as any party shall specify by notice to the
others.

     8.8  COUNTERPARTS.  This Agreement may be executed in any number of
          ------------                                                  
counterparts, each of which shall be deemed to be an original and all of which
together shall be deemed to be one and the same.

     8.9  ATTACHMENT OF DISCLOSURE SCHEDULES.  Southwest Bank, Concho and First
          ----------------------------------                                   
Financial acknowledge that the Disclosure Schedules referenced herein may not be
attached hereto at the time of execution of this Agreement.  It is the intent of
all parties hereto that the form and content of all such Disclosure Schedules
will be prepared in a form acceptable to First 

                                     - 24 -
<PAGE>

Financial and that such Disclosure Schedules shall then be attached to this
Agreement and that such Disclosure Schedules shall then become a part of this
Agreement for all purposes.  In the event that such Disclosure Schedules are not
prepared in a form acceptable to First Financial, this Agreement may be
terminated by First Financial by written notice and be of no further force and
effect.  Notwithstanding the fact that any such Disclosure Schedule may be
attached hereto at the time of execution, the date of this Agreement or date of
execution of this Agreement shall for all purposes be the date first written
above.

     8.10 BINDING EFFECT - ASSIGNMENT.  This Agreement is binding upon the
          ---------------------------                                     
undersigned parties, their heirs, personal representatives, successors and
assigns; however, the rights of First Financial under this Agreement may not be
assigned without the prior written consent of Southwest Bank and Concho except
that, at closing, the Subsidiary may acquire the Shares so long as First
Financial remains liable for its obligations under this Agreement.

     8.11 DEFINITIONS.  In addition to other definitions contained elsewhere in
          -----------                                                          
this Agreement, as used in this Agreement:

          (A)  an "AFFILIATE" means any bank, corporation, partnership or other
     entity which, directly or indirectly, controls, is controlled by, or is
     under common control with, Concho or Southwest Bank;

          (B)  "BANKING DAY" means any day, other than a Saturday or Sunday, on
     which Southwest Bank is open to the public for carrying substantially all
     of its banking functions;

          (C)  "KNOWLEDGE" means a current actual awareness of a fact or other
     information, and "KNOWINGLY" means possessing a current actual awareness of
     a fact or other information;

          (D)  references to a particular "ARTICLE" or "SECTION" are to the
     given article or section of this Agreement; and

          (E)  unless context otherwise requires, words of the singular number
     include the plural and of the plural include the singular and words of the
     masculine gender include the feminine and neuter.

                                     - 25 -
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement, in
multiple originals, as of the day and year first above written.

                                    FIRST FINANCIAL BANKSHARES, INC.
ATTEST:


By: /s/ Curtis R. Harvey            By: /s/ Kenneth T. Murphy
   -----------------------------       -----------------------------
     Curtis R. Harvey,              Kenneth T. Murphy,
     Executive Vice President       Chairman of the Board, President
     and Chief Financial Officer    and Chief Executive Officer


                                    CONCHO BANCSHARES, INC.
ATTEST:


By: /s/ Michael L. Boyd             By: /s/ David B. Drake
   -----------------------------       -----------------------------  
     Name: Michael L. Boyd          David B. Drake,
          ----------------------    Chairman of the Board and
     Title: Asst. Sec.-Treas.       Chief Executive Officer
           ---------------------


                                    SOUTHWEST BANK OF SAN ANGELO
ATTEST:


By: /s/ Katherine M. Reeves         By: /s/ Michael L. Boyd
   -----------------------------       -----------------------------
     Name: Katherine M. Reeves            Michael L. Boyd
          ----------------------         ---------------------------
     Title: Sr. VP & Cashier            President
           ---------------------

                                     - 26 -

<PAGE>

 (LETTERHEAD OF MCMAHON, SUROVIK, SUTTLE, BUHRMANN, COBB & HICKS APPEARS HERE)

                                                                     EXHIBIT 5.1

                               January 10, 1994



First Financial Bankshares, Inc.
P.O. Box 701
Abilene, TX 79804

Dear Sirs:

     We have acted as counsel to First Financial Bankshares, Inc. (the 
"Company") in connection with certain matters concerning a Registration 
Statement on Form S-4 (the "Registration Statement") relating to an aggregate of
232,550 shares (the "Shares") of the Company's Common Stock, par value $10.00 
per share, to be issued in connection with the Exchange Offer by the Company 
to the shareholders of Concho Bancshares, Inc. Capitalized terms used herein
that are not otherwise defined have the meaning ascribed to them in the
Prospectus which constitutes a part of the Registration Statement.

     We have examined such corporate records, documents, instruments and 
certificates of the Company and have received such representations from the 
officers and directors of the Company and have reviewed such questions of law as
we have deemed necessary, relevant or appropriate to enable us to render the 
opinion expressed herein. During the course of our examination, we have assumed 
the genuineness of all signatures and the authenticity of all documents, 
instruments, records and certificates submitted to us as originals.

     Based upon our examination and review and upon the representations made to 
us by the officers and directors of the Company, we are of the opinion that the 
Shares have been duly and validly authorized and will, upon issuance and 
delivery against payment therefor in the manner contemplated by the Exchange 
Offer and Merger, be validly issued, and upon such issuance, the Shares will be 
fully paid and nonassessable.

     This firm consents to the filing of this opinion as to an exhibit to the 
Registration Statement and to the reference to the firm in the Prospectus 
constituting a part thereof under the caption "Legal Matters."

                                    Very truly yours,

                                    McMAHON, SUROVIK, SUTTLE,
                                    BUHRMANN, COBB & HICKS, P.C.

                                    By: /s/ David L. Buhrmann
                                       -----------------------------
                                       David L. Buhrmann

DLB/rw

<PAGE>

                                                                     Exhibit 8.1

                                January 7, 1994


The Board of Directors 
Concho Bancshares, Inc. 
P. O. Box 60410
San Angelo, Texas 76906

Dear Sirs

Pursuant to Section 2.2 of the Stock Exchange Agreement and Plan of
Reorganization, dated as of December 7, 1993 (the "Agreement") among First
Financial Bankshares, Inc. ("First Financial"), Concho Bancshares, Inc.
("Concho") and Southwest Bank of San Angelo ("Southwest Bank"), our opinion has
been requested with respect to certain of the Federal income tax consequences of
the exchange by the Concho shareholders of their Concho stock for First
Financial voting common stock (the "Stock Exchange") and the merger of Concho
with and into First Financial Bankshares of Delaware, Inc. ("FFB Delaware"), a
wholly-owned subsidiary of First Financial (the "Merger").  This opinion letter
                                                            -------------------
supersedes our opinion letter dated December 17, 1993.
- ------------------------------------------------------

In rendering our opinion, we have reviewed the Agreement and such other
documents as we have deemed necessary or appropriate.  We have relied upon the
accuracy and completeness of the facts, information, covenants and 
representations contained in the Agreement and such other documents. 
Furthermore, we have assumed that the Stock Exchange and Merger will be
consummated in accordance with the Agreement and that the Merger will qualify as
a merger under applicable State law.

In rendering our opinion, we have considered the applicable provisions of the
Internal Revenue Code of 1986, as amended (the "Code"), Treasury Regulations
promulgated thereunder, pertinent judicial authorities, interpretive rulings of
the Internal Revenue Service and such other authorities as we have considered
relevant.  It should be noted that statutes, regulations, judicial decisions and
administrative interpretations are subject to change at any time and, in some
circumstances, with retroactive effect.  A material change in the authorities
upon which our opinion is based could affect our conclusions.  However, we
assume no obligation to revise or supplement this opinion if any subsequent
change were to occur.

Requisite to a tax-free reorganization under the Code is a continuity of
interest in the business enterprise on the part of those persons who were the
owners of the enterprise prior to the reorganization.  Accordingly, the Concho
shareholders, as a group, will be required to satisfy the continuity of interest
doctrine through a post-exchange continuing ownership
<PAGE>

The Board of Directors 
Concho Bancshares, Inc. 
January 7, 1994        
Page 2                  

of the First Financial voting common stock received in the Stock Exchange.  In
this regard, a disposition by the Concho shareholders of a substantial portion
(in the aggregate) of their post-exchange First Financial shares which is
pursuant to a plan, intention or arrangement existing at the time of the Stock
Exchange will result in a failure to satisfy the continuity of interest
doctrine.  The Internal Revenue Service takes the position that 50 percent (in
the aggregate) constitutes a "substantial portion."  A failure to satisfy the
continuity of interest doctrine will result in the Stock Exchange being a
taxable transaction to the Concho shareholders.  In rendering our opinion, we
have assumed that the continuity of interest doctrine can and will be satisfied.

Also requisite to a tax-free reorganization under the Code is a continuity of
the business enterprise under the modified corporate form.  The continuity of
business enterprise doctrine requires that the acquiring corporation either
continue the acquired corporation's historic business or use a significant
portion of the acquired corporation's historic business assets in a business. 
Accordingly, in order to satisfy the continuity of business enterprise doctrine,
First Financial and/or one or more of its controlled subsidiaries will be
required to either continue the historic business of Concho and Southwest Bank
or use a significant portion of the historic business assets of Concho and
Southwest Bank in a business.  A failure to satisfy the continuity of business
enterprise doctrine will result in the Stock Exchange being a taxable
transaction to the Concho shareholders.  In rendering our opinion, we have
assumed that the continuity of business enterprise doctrine will be satisfied.

In addition to the requirements noted in the foregoing for a tax-free
reorganization under the Code, there is the requirement that, immediately after
a stock-for-stock exchange, the acquiring corporation must have control of the
acquired corporation.  For purposes of the reorganization provisions of the
Code, the term "control" means the ownership of stock possessing at least 80
percent of the total combined voting power of all classes of stock entitled to
vote and at least 80 percent of the total number of shares of all other classes
of stock of the corporation.  Therefore, in order to satisfy the control
requirement, First Financial and/or one or more of its controlled subsidiaries
will have to own at least 80 percent of the outstanding stock of Concho
immediately after the Stock Exchange.  If the Stock Exchange is consummated with
First Financial acquiring less than 80 percent of the outstanding stock of
Concho, the Stock Exchange will be a taxable transaction to the Concho
shareholders.  In rendering our opinion, we have assumed that the control
requirement will be satisfied.

Based solely upon and subject to the foregoing, we are of the opinion that under
current law:

     1.   The Stock Exchange and Merger will be treated as a reorganization
          within the meaning of Section 368(a) of the Code, and First Financial,
          Concho and FFB Delaware each will be a party to the reorganization
          within the meaning of Section 368(b) of the Code.

     2.   No gain or loss will be recognized by the Concho shareholders upon
          receipt of
<PAGE>

The Board of Directors 
Concho Bancshares, Inc. 
January 7, 1994        
Page 3                  

          First Financial voting common stock in exchange for their Concho
          stock, except for any gain or loss recognized with respect to
          shareholders who receive cash in lieu of fractional share interests in
          First Financial voting common stock or pursuant to the exercise of
          statutory dissenter rights.

     3.   The aggregate Federal income tax basis of the shares of First
          Financial voting common stock received by the Concho shareholders in
          exchange for their shares of Concho stock will be the same as the
          aggregate adjusted tax basis of their Concho stock exchanged therefor,
          less the tax basis, if any, allocated to fractional share interests.

     4.   The holding period of the First Financial voting common stock received
          by the Concho shareholders in exchange for their shares of Concho
          stock in the hands of the Concho shareholders will include the holding
          period of their Concho stock exchanged therefor.

Except as set forth above, we express no opinion as to the tax consequences,
whether Federal, State or local, of the Stock Exchange and Merger, or of any
transactions related thereto.  We are furnishing this opinion to you solely in
connection with Section 2.2 of the Agreement.  This opinion is solely for your
benefit and is not to be used, circulated, quoted or otherwise referred to for
any purpose without our prior consent.

We hereby consent to the references made to us in the Summary and under the
heading "The Exchange Offer - Certain Federal Income Tax Consequences" in the
Offering Circular/Prospectus of First Financial Relating to the Stock Exchange,
and to the inclusion of this opinion as an Annex to the Offering
Circular/Prospectus and the filing of this opinion as an exhibit to the
Registration Statement on Form S-4 of which such Offering Circular/Prospectus is
a part.


                                    Very truly yours






                                    ARMSTRONG, BACKUS & CO., L.L.P.

<PAGE>

                                                                    EXHIBIT 15.1


                    INDEPENDENT ACCOUNTANTS' ACKNOWLEDGMENT


     We acknowledge and consent to the use in the Registration Statement on Form
S-4 of which this Exhibit 15.1 is a part, of our Compilation Report dated
December 6, 1993 relating to the consolidated balance sheets of Concho
Bankshares, Inc. and Subsidiary, as of September 30, 1993 and 1992, and the
related consolidated statements of earnings, changes in stockholders' equity and
cash flows for the nine months then ended and the consolidated statements of
earnings for the three months ended September 30, 1993 and 1992.



                                       ARMSTRONG, BACKUS & CO., L.L.P.

<PAGE>

                                                                    Exhibit 23.3

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent public accountants, we hereby consent to the use of our report
dated January 13, 1993, (and to all references to our Firm) included in or made
a part of this registration statement.



                                                      ARTHUR ANDERSEN & CO.

Dallas, Texas
January 10, 1994

<PAGE>

                                                                    Exhibit 23.4

                         INDEPENDENT AUDITORS' CONSENT


We consent to the reference to our firm under the caption "Experts" and to use
of our report dated February 12, 1993, with respect to the financial statements
of Concho Bancshares, Inc. included in the Registration Statement (Form S-4) and
related prospectus.



                                              ARMSTRONG, BACKUS & CO., L.L.P.


January 7, 1994


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