UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549

                                    FORM 8-K


                                 CURRENT REPORT

                     PURSUANT TO SECTION 13 OR 15(d) OF THE

                         SECURITIES EXCHANGE ACT OF 1934


Date of Report (Date of Earliest Event Reported):    December 30, 2005


                        FIRST FINANCIAL BANKSHARES, INC.
                        --------------------------------
             (Exact Name of Registrant as Specified in its Charter)


       Texas                         0-7674                      75-0944023
----------------------        ---------------------         -------------------
(State of Jurisdiction        (Commission File No.)         (IRS Employer
 or Incorporation)                                          Identification No.)


                      400 Pine Street, Abilene, Texas 79601
                      -------------------------------------
              (Address of Principal Executive Offices and Zip Code)

                  Registrant's Telephone Number (325) 627-7155


Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2. below):

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR
    230.425)
[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act
    (17 CFR 240.14a-12) 
[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
    Act (17 CFR 240.14d-2 (b)) 
[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
    Act (17 CFR 240.13e-4(c))





ITEM 1.01         Entry into a Material Definitive Agreement

     On December 28, 2005, the Company renewed its loan agreement with The Frost
National Bank to be effective  December 31, 2005.  Under the loan agreement,  as
renewed and amended,  the Company is permitted to draw up to $50.0  million on a
revolving  line of credit.  Interest is paid  quarterly  at LIBOR plus 100 basis
points and the line of credit matures  December 31, 2006. If a balance exists at
December 31, 2006,  the principal  balance  converts to a term facility  payable
quarterly  over five years.  The line of credit is unsecured for an  outstanding
balance equal to or under $25.0 million and secured by the stock of a subsidiary
bank should the balance  exceed $25.0  million.  Among other  provisions  in the
credit agreement,  the Company must satisfy certain  financial  covenants during
the term of the loan agreement,  including  without  limitation,  covenants that
require the Company to maintain certain capital,  tangible net worth,  loan loss
reserve,  non-performing  asset and cash flow coverage ratio.  In addition,  the
credit agreement  contains  certain  operational  covenants,  that among others,
restricts the payment of dividends above 55% of consolidated net income,  limits
the incurrence of debt (excluding any amounts  acquired in an  acquisition)  and
prohibits  the  disposal of assets  except in the  ordinary  course of business.
Since  1995,  the  Company  has  declared  dividends  as  a  percentage  of  its
consolidated  net  income in a range of 37% (low) in 1995 to 53% (high) in 2003.
Through the nine months  ended  September  30,  2005,  the Company has  declared
dividends equal to 51% of its consolidated net income.  On December 2, 2005, the
Company  borrowed $1.5 million in connection  with its acquisition of Bridgeport
Financial Corporation. This amount was repaid in full on December 30, 2005.


ITEM 9.01         Financial Statements and Exhibits

         (c)      Exhibits


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

              10.1            Loan agreement, dated December 31, 2004, between 
                              First Financial  Bankshares,  Inc. and The Frost 
                              National Bank  (incorporated by  reference  from
                              Exhibit  10.1 of the  Registrant's  Form 8-K filed
                              December 31, 2004)


              10.2            First Amendment to Loan  Agreement, dated December
                              28, 2005, between First Financial Bankshares, Inc.
                              and The Frost National Bank.


                                   SIGNATURES
                                   ----------

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
Registrant  has duly  caused  this  Report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.


                                           FIRST FINANCIAL BANKSHARES, INC.
                                           (Registrant)



DATE:  December 28, 2005          By:      /S/ F. Scott Dueser
                                           -------------------------------------
                                           F. SCOTT DUESER
                                           President and Chief Executive Officer





                                                                    EXHIBIT 10.2

                        FIRST AMENDMENT TO LOAN AGREEMENT
                        ---------------------------------


     THIS FIRST AMENDMENT TO LOAN AGREEMENT (the "First  Amendment") dated as of
the 31st day of December,  2005, to the Loan Agreement  (the "Loan  Agreement"),
made and entered  into as of December  31,  2004,  by and among FIRST  FINANCIAL
BANKSHARES,  INC., a Texas corporation,  (the "Borrower") and THE FROST NATIONAL
BANK (the "Lender").  All capitalized  terms not otherwise  defined herein shall
have the meaning ascribed to each of them in the Loan Agreement.

                              W I T N E S S E T H:

     WHEREAS,  Borrower  executed the Loan  Agreement  to govern  those  certain
promissory notes from Lender,  specifically,  that certain  $50,000,000.00  Note
(the "Note");

     WHEREAS,  the  Borrower  desires to renew and  extend the unpaid  principal
balance of the Note; and

     WHEREAS, the Lender agrees to renew and extend the Note, all as hereinafter
provided.

     NOW,  THEREFORE,  in  consideration  of the  premises  and  other  good and
valuable  consideration,  the  receipt  and  sufficiency  of  which  are  hereby
acknowledged, Borrower and Lender do hereby agree as follows:

                                    ARTICLE I
                                    ---------

                           Amendment to Loan Agreement
                           ---------------------------



     1.1 Amendment to Section 2.02(a) of the Loan Agreement. Borrower and Lender
agree to, and do hereby, amend the Loan Agreement by deleting Section 2.02(a) of
the Loan  Agreement in its entirety and  substituting  therefore  the  following
paragraphs:

          "2.02 The Note.  The  obligation  of Borrower to pay the Loan shall be
     evidenced  by a  promissory  note (the  "Note")  executed by  Borrower  and
     payable  to the order of Lender,  in the  principal  amount of  $50,000,000
     bearing  interest at the variable rate set forth in the Note.  The Borrower
     shall pay principal and interest in accordance  with the terms of the Note,
     with the maturity date being as set forth in the Note.

          (a)  Advances.  From Closing Date and  continuing at all times through
     December 31, 2006 (the "Revolving Credit Period") the Loan evidenced by the
     Note shall be a revolving  credit facility which will allow the Borrower to
     request  such  amounts as  Borrower  may elect from time to time (each such
     amount being herein called an "Advance") so long as the aggregate amount of
     Advances  outstanding  at any time  under  the Note does not  exceed  Fifty
     Million and No/100 Dollars  ($50,000,000.00)  provided however, the minimum
     Advance must be at least $500,000.00.  The Borrower shall have the right to
     borrow,  repay,  and borrow  again  during  the  Revolving  Credit  Period.
     Interest shall be due and payable  quarterly and shall accrue at LIBOR plus





     100 basis points. The outstanding principal balance of the Note on December
     31, 2006 shall convert to a term facility and shall be payable quarterly in
     accordance with the terms of the Note,  with all unpaid  principal plus all
     accrued and unpaid interest being due and payable on December 31, 2011.

                                   ARTICLE II
                                   ----------

                           Conditions of Effectiveness
                           ---------------------------

     2.1  Effective  Date.  This First  Amendment  shall become  effective as of
December 31, 2005, when, and only when, Lender shall have received  counterparts
of this First Amendment  executed and delivered by Borrower and Lender, and when
each of the following  conditions  shall have been met, all in form,  substance,
and date satisfactory to Lender:

          (a) Closing  Documents.  Borrower shall have executed and delivered to
     Lender (I) a Renewal Promissory Note, payable to the order of Lender as set
     forth  therein,  duly executed on behalf of the Borrower,  dated  effective
     December  31,  2005  in  the  principal  amount  of  $50,000,000.00,   (ii)
     Arbitration and Notice of Final Agreement,  (iii)  Certificate of Corporate
     Resolutions, and (iv) this First Amendment.

          (b)  Additional  Loan  Documents.  Borrower  shall have  executed  and
     delivered to Lender such other  documents  as shall have been  requested by
     Lender to renew,  and extend,  the Loan  Documents to secure payment of the
     Obligations  of  Borrower,  all in  form  satisfactory  to  Lender  and its
     counsel.

                                   ARTICLE III
                                   -----------

                         Representations and Warranties
                         ------------------------------

     3.1 Representations and Warranties. In order to induce Lender to enter into
this First Amendment, Borrower represents and warrants the following:

          (a) Borrower has the corporate power to execute and deliver this First
     Amendment,  the Renewal  Promissory  Note,  and other Loan Documents and to
     perform all of its obligations in connection herewith and therewith.

          (b) The  execution  and delivery by Borrower of this First  Amendment,
     the Renewal  Promissory  Note, and other Loan Documents and the performance
     of its obligations in connection herewith and therewith: (I) have been duly
     authorized or will be duly ratified and affirmed by all requisite corporate
     action;  (ii) will not violate any provision of law, any order of any court
     or agency of government or the Articles of  Incorporation or Bylaws of such
     entity;  (iii)  will not be in  conflict  with,  result  in a breach  of or
     constitute  (alone  or with due  notice or lapse of time or both) a default
     under  any  indenture,  agreement  or other  instrument;  and (iv) will not
     require any  registration  with,  consent or approval of or other action by
     any  federal,   state,   provincial  or  other  governmental  authority  or
     regulatory body.





          (c) There is no action,  suit or  proceeding at law or in equity or by
     or before any  governmental  instrumentality  or other agency or regulatory
     authority now pending or, to the knowledge of Borrower,  threatened against
     or  affecting  Borrower,  or any  properties  or  rights  of  Borrower,  or
     involving  this First  Amendment or the  transactions  contemplated  hereby
     which,  if  adversely  determined,  would  materially  impair  the right of
     Borrower to carry on business  substantially as now conducted or materially
     and adversely affect the financial condition of Borrower, or materially and
     adversely  affect the ability of Borrower to  consummate  the  transactions
     contemplated by this First Amendment.

          (d) The  representations  and warranties of Borrower  contained in the
     Loan Agreement,  this First Amendment, the Renewal Promissory Note, and any
     other Loan Document  securing  Borrower's  Obligations and  indebtedness to
     Lender are correct and accurate on and as of the date hereof as though made
     on and as of the date  hereof,  except to the  extent  that the facts  upon
     which such  representations are based have been changed by the transactions
     herein contemplated.

                                   ARTICLE IV
                                   ----------

                           Ratification of Obligations
                           ---------------------------

     4.1  Ratification  of  Obligation.  The Borrower  does hereby  acknowledge,
ratify and confirm that it is  obligated  and indebted to Lender as evidenced by
the Loan Agreement (as amended by the First Amendment),  the Renewal  Promissory
Note and all other Loan Documents.

     4.2 Ratification of Agreements.  The Loan Agreement,  this First Amendment,
the Renewal  Promissory  Note, and each other Loan Document,  as hereby amended,
are  acknowledged,  ratified  and  confirmed  in all  respects  as being  valid,
existing,  and of full force and effect.  Any reference to the Loan Agreement in
any Loan  Document  shall be deemed to be a reference  to the Loan  Agreement as
amended by this First Amendment.  The execution,  delivery and  effectiveness of
this First Amendment shall not, except as expressly provided herein,  operate as
a waiver of any right,  power or remedy of Lender under the Loan Agreement,  nor
constitute a waiver of any provision of the Loan Agreement.


                                    ARTICLE V
                                    ---------

                                  Miscellaneous
                                  -------------

     5.1 Survival of Agreements. All representations,  warranties, covenants and
agreements of Borrower,  herein or in any other Loan Document  shall survive the
execution and delivery of this First Amendment, and the other Loan Documents and
the performance  hereof and thereof,  including without limitation the making or
granting of the Loan and the  delivery of the  Renewal  Promissory  Note and all
other  Loan  Documents,  and  shall  further  survive  until  all of  Borrower's
Obligations to Lender are paid in full. All statements and agreements  contained
in any  certificate or instrument  delivered by Borrower  hereunder or under the
Loan Documents to Lender shall be deemed to constitute the  representations  and
warranties by Borrower  and/or  agreements  and covenants of Borrower under this
First Amendment and under the Loan Agreement.

     5.2 Loan Document.  This First Amendment,  the Renewal Promissory Note, and





each  other  Loan  Document  executed  in  connection  herewith  are each a Loan
Document and all  provisions in the Loan  Agreement,  as amended,  pertaining to
Loan Documents apply hereto and thereto.

     5.3 Governing Law. This First  Amendment shall be governed by and construed
in all  respects  in  accordance  with  the laws of the  State of Texas  and any
applicable  laws  of the  United  States  of  America,  including  construction,
validity and performance.

     5.4  Counterparts.  This First Amendment may be separately  executed in any
number of counterparts and by different parties hereto in separate counterparts,
each of which when so executed  shall be deemed to  constitute  one and the same
First Amendment.

     5.5 Release of Claims.  Borrower, by its execution of this First Amendment,
hereby declares that it has no set-offs, counterclaims, defenses or other causes
of action against Lender arising out of the Loan, the renewal,  modification and
extension of the Loan, any documents mentioned herein or otherwise;  and, to the
extent any such setoffs, counterclaims, defenses or other causes of action which
may exist, whether known or unknown,  such items are hereby expressly waived and
released by Borrower.

     5.6  ENTIRE  AGREEMENT.  THIS  FIRST  AMENDMENT,  TOGETHER  WITH  ANY  LOAN
DOCUMENTS EXECUTED IN CONNECTION HEREWITH, CONTAINS THE ENTIRE AGREEMENT BETWEEN
THE PARTIES  HERETO  RELATING TO THE SUBJECT  MATTER  HEREOF AND THEREOF AND ALL
PRIOR AGREEMENTS  RELATIVE THERETO WHICH ARE NOT CONTAINED HEREIN OR THEREIN ARE
TERMINATED.  THERE ARE NO UNWRITTEN ORAL  AGREEMENTS  BETWEEN THE PARTIES.  THIS
FIRST  AMENDMENT,  AND THE  LOAN  DOCUMENTS  MAY BE  AMENDED,  REVISED,  WAIVED,
DISCHARGED,  RELEASED OR TERMINATED ONLY BY A WRITTEN INSTRUMENT OR INSTRUMENTS,
EXECUTED BY THE PARTY  AGAINST WHICH  ENFORCEMENT  OF THE  AMENDMENT,  REVISION,
WAIVER,  DISCHARGE,  RELEASE OR TERMINATION IS ASSERTED.  ANY ALLEGED AMENDMENT,
REVISION,  WAIVER, DISCHARGE,  RELEASE OR TERMINATION WHICH IS NOT SO DOCUMENTED
SHALL NOT BE EFFECTIVE AS TO ANY PARTY.





     IN WITNESS  WHEREOF,  this First Amendment is executed  effective as of the
date first written above.

BORROWER:                                  FIRST FINANCIAL BANKSHARES, INC.



                                  By:      /S/ F. Scott Dueser
                                           -------------------------------------
                                           F. SCOTT DUESER
                                           President and Chief Executive Officer



LENDER:                                     THE FROST NATIONAL BANK



                                  By:      /S/ Jerry L. Crutsinger
                                           -------------------------------------
                                           Senior Vice President



     The Guarantor is executing this First  Amendment to  acknowledge  the terms
and conditions of the renewal.



GUARANTOR:                                 FIRST FINANCIAL BANKSHARES OF
                                           DELAWARE, INC.



                                  By:
                                           -------------------------------------
                                  Its:
                                           -------------------------------------