Document:

<PAGE>   1
                                                                     EXHIBIT 4.1

                                                                           FILED
                                                        JUL 18, 1985, 10:00 A.M.
                                                             SIGNATURE ILLEGIBLE
                                                              SECRETARY OF STATE

                          CERTIFICATE OF INCORPORATION

                                       OF

                            CENTURY BANCSHARES, INC.

                                    ARTICLE I

      The name of the corporation is Century Bancshares, Inc.

                                   ARTICLE II

      The registered agent of the corporation is The Corporation Trust Company.
The address of such registered agent is 1209 Orange Street, County of New
Castle, Wilmington, Delaware 19801.

                                   ARTICLE III

      The nature of the business or purposes to be conducted or promoted by the
corporation is to engage in any lawful act or activity for which corporations
may be organized under the General Corporation Law of Delaware.

                                   ARTICLE IV

      The total number of shares which the corporation shall have the authority
to issue is 3,000,000, of which 2,000,000 shares of the par value of $1.00 each
shall be shares of common stock, and 1,000,000 shares of the par value of $1.00
each shall be shares of preferred stock.

      The corporation may issue one or more series of preferred stock. The
preferred stock of each such series shall have such voting powers, full or
limited, or no voting powers, and such designations, preferences and relative,
participating, optional, redemption, conversion, exchange or other special
rights, and qualifications, limitations or restrictions thereof, as shall be
stated and expressed by the board of directors in the resolution or resolutions
providing for the issue of such series of preferred stock pursuant to the
authority to do so which is hereby expressly vested in the board of directors.
<PAGE>   2
      Except as otherwise provided in any resolution or resolutions of the board
of directors providing for the issue of any particular series of preferred
stock, the number of shares of stock of any such series so set forth in such
resolution or resolutions may be increased or decreased (but not below the
number of shares of such series then outstanding) by a resolution or resolutions
likewise adopted by the board of directors.

      Except as otherwise provided in any resolution or resolutions of the board
of directors providing for the issue of any particular series of preferred
stock, preferred stock redeemed or otherwise acquired by the corporation shall
assume the status of authorized but unissued preferred stock and shall be
unclassified as to series and may thereafter, subject to the provisions of this
Article IV and to any restrictions contained in any resolution or resolutions of
the board of directors providing for the issue of any such series of preferred
stock, be reissued in the same manner as other authorized but unissued preferred
stock.

      Except as otherwise specifically required by law or as specifically
provided in any resolution or resolutions of the board of directors providing
for the issue of any particular series of preferred stock, the exclusive voting
power of the corporation shall be vested in the common stock of the corporation.
Each share of common stock entitles the holder thereof to one vote at all
meetings of the stockholders of the corporation.

                                    ARTICLE V

      The name and address of the incorporator of Century Bancshares, Inc. is
as follows:

                   Name                     Mailing Address
                   ----                     ---------------
             William T. Luedke IV       2900 South Tower Pennzoil Place
                                         Houston, Texas 77002

                                   ARTICLE VI

      The name and mailing address of each person who is to serve as a director
of the corporation until the first annual meeting of the stockholders of the
corporation or until a successor is elected and qualified is as follows:

                   Name                     Mailing Address
                   ----                     ---------------
             Joseph S. Bracewell    Century National Bank
                                    1875 Eye Street, N.W.
                                    Washington, D.C. 20006

             John R. Cope           Bracewell & Patterson
                                    1825 Eye Street, 12th Floor
                                    Washington, D.C. 20006

                                      -2-
<PAGE>   3
                   Name                   Mailing Address
                   ----                   ---------------
              William H. Isaac       T/I Associates
                                     1910 K Street, N.W., Suite 800
                                     Washington, D.C. 20006

              Joseph H. Koonz, Jr.   Koonz, McKenney & Johnson
                                     2020 K Street, N.W., Suite 840
                                     Washington, D.C. 20006

              William C. Oldaker     1140 19th Street, N.W. Suite 900
                                     Washington, D.C. 20463

              Douglas J. Patton      Federal Election Commission
                                     1325 K Street, N.W.
                                     Washington, D.C. 20463

                                   ARTICLE VII

      In furtherance and not in limitation of the powers conferred by statute,
the board of directors is expressly authorized to adopt, amend or repeal the
by-laws of the corporation.

                                  ARTICLE VIII

      Elections of directors need not be by written ballot unless the by-laws of
the corporation shall so provide.

      Meetings of stockholders may be held within or without the State of
Delaware, as the by-laws may provide. The books of the corporation may be kept
(subject to any provision contained in the statutes of the State of Delaware)
outside the State of Delaware at such place or places as may be designated from
time to time by the board of directors or in the by-laws of the corporation.

                                   ARTICLE IX

      The corporation reserves the right to amend, alter or repeal any provision
contained in this Certificate of Incorporation, in the manner now or hereafter
prescribed by the laws of the State of Delaware, and to add additional
provisions authorized by such laws as are then in force. All rights conferred on
the directors or stockholders of the corporation herein or in any amendment
hereof are granted subject to this reservation.

      I, THE UNDERSIGNED, being the incorporator hereinabove named, for the
purpose of forming a corporation pursuant to the General Corporation Law of the
State of Delaware, do hereby make this Certificate, hereby declaring and
certifying that this is my act and deed and the facts herein stated are true,
and accordingly have hereunto set my hand this 17th day of July, 1985.

                                         /s/ WILLIAM T. LUEDKE IV
                                         --------------------------------------
                                         William T. Luedke IV

                                      -3-
<PAGE>   4

                                                                           FILED
                                                          MAR 4, 1987 10:00 A.M.
                                                             SIGNATURE ILLEGIBLE
                                                              SECRETARY OF STATE

                            CERTIFICATE OF AMENDMENT

                                     OF THE

                          CERTIFICATE OF INCORPORATION

                                       OF

                            CENTURY BANCSHARES, INC.

      Century Bancshares, Inc. (the "Corporation"), a corporation organized
and existing under and by virtue of the General Corporation Law of the State
of Delaware, does hereby certify:

      FIRST: That the Board of Directors of the Corporation (the "Board"), at a
meeting duly called and held on February 11, 1987 (the "Board Meeting"), at
which meeting a quorum was present and acting throughout, adopted a resolution
proposing and declaring advisable and in the best interest of the Corporation
that as permitted by Section 102 of the General Corporation Law of the State of
Delaware, the Corporation's Certificate of Incorporation ("Certificate") be
amended by adding thereto a new Article X which shall be and read in its
entirety as follows:

                                   "ARTICLE X

            No director of the corporation shall be personally liable to the
      corporation or its stockholders for monetary damages for breach of
      fiduciary duty as a director; provided, however, that the foregoing clause
      shall not apply to any liability of a director (i) for any breach of the
      director's duty of loyalty to the Corporation or its stockholders, (ii)
      for acts or omissions not in good faith or which involve intentional
      misconduct or a knowing violation of the law, (iii) under Section 174 of
      the Delaware General Corporation Law, or (iv) for any transaction from
      which the director derived an improper personal benefit. This Article X
      shall not eliminate or limit the personal liability of a director for any
      action or omission occurring prior to the date Article X becomes
      effective."

      SECOND: That at the Board Meeting, the Board adopted a resolution
proposing and declaring advisable and in the best interest of the Corporation
that the Certificate be amended by adding thereto a new Article XI which shall
be and read in its entirety as follows:

                                      -4-
<PAGE>   5

                                   "ARTICLE XI

            No action required to be taken or that may be taken at any annual or
      special meeting of stockholders of the corporation may be taken by written
      consent without a meeting, prior notice and a vote."

      THIRD: That at the Board Meeting, the Board adopted a resolution proposing
and declaring advisable and in the best interest of the Corporation that the
Certificate be amended by adding thereto a new Article XII which shall be and
read in its entirety as follows:

                                  "ARTICLE XII

            With respect solely to the following five corporate actions, for
      which the Delaware General Corporation Law provides for the affirmative
      vote or consent of the holders of a majority of the outstanding shares of
      capital stock of the corporation or any class or series thereof entitled
      to vote (and, with respect to any class or series of capital stock
      established by resolution of the Board of Directors, subject to the
      provisions of the resolutions establishing such class or series), to the
      extent, and only to the extent, that such vote or consent is provided for
      by the Delaware General Corporation Law, the affirmative vote or consent
      of the holders of at least two-thirds, rather than a majority, of the
      outstanding shares of capital stock of the corporation or such class or
      series thereof entitled to vote shall be required to take such action: (i)
      the amendment of the Certificate of Incorporation of the corporation; (ii)
      the merger or consolidation of the corporation; (iii) the sale, lease, or
      exchange of all or substantially all of the property and assets of the
      corporation; (iv) the adoption of any plan or proposal for the liquidation
      or dissolution of the corporation; or (v) the revocation of a dissolution
      of the corporation.

      FOURTH: That at the Board Meeting, the Board directed that the preceding
proposed amendments to the Certificate be represented to the stockholders of the
Corporation for their consideration and recommended the adoption of such
amendments by the stockholders of the Corporation.

      FIFTH: That thereafter, at the annual meeting of the Corporation's
stockholders duly called and, upon notice in accordance with the provisions of
Section 222 of the General Corporation Law of the State of Delaware, held on
February 27, 1987 the holders of more than the majority of the outstanding
shares of capital stock of the Corporation entitled to vote thereon approved
each and all of the aforesaid amendments to the Certificate.

                                      -5-
<PAGE>   6
      SIXTH:  That the aforesaid amendments were duly adopted in accordance
with the provisions of Section 242 of the General Corporation Law of the
State of Delaware.

      IN WITNESS WHEREOF, the Corporation has caused this Certificate of
Amendment to be signed by Joseph S. Bracewell III, as President of the
Corporation, and Rosemary M. DeMark, as Assistant Secretary of the Corporation,
this 27th day of February, 1987.

                                      CENTURY BANCSHARES, INC.

                                By:   /s/ JOSEPH S. BRACEWELL III
                                      ------------------------------
                                      Joseph S. Bracewell III
                                      President
ATTEST:

/s/ ROSEMARY M. DEMARK
------------------------------
Rosemary M. DeMark
Secretary

                                      -6-
<PAGE>   7

                                                               STATE OF DELAWARE
                                                              SECRETARY OF STATE
                                                        DIVISION OF CORPORATIONS
                                                       FILED 01:00 PM 08/04/1997
                                                             971259013 - 2066851

                            CERTIFICATE OF AMENDMENT
                                       OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                           CENTURY BANCSHARES, INC.

      Century Bancshares, Inc., a corporation duly organized and existing
under and by virtue of the General Corporation Law of the State of Delaware
(the "Company"), does hereby certify:

      FIRST: That the Board of Directors of the Company, at a meeting duly
called and held on April 15, 1997, at which meeting a quorum was present and
acting throughout (the "Board Meeting"), adopted a resolution proposing and
declaring advisable and in the best interests of the Company that the Company's
Certificate of Incorporation be amended by amending the first sentence of
Article IV to read in its entirety as follows:

            "The total number of shares of stock which the corporation shall
      have authority to issue is 6,000,000 shares, of which 5,000,000 shares of
      the par value of $1.00 each shall be shares of common stock, 1,000,000
      shares of the par value of $1.00 each shall be shares of preferred stock."

      SECOND: That at that Board Meeting, the Board directed that the preceding
proposed amendment to the Certificate of Incorporation be presented to the
stockholders of the Company entitled to vote thereon for their consideration and
recommended the adoption of such amendment by the stockholders of the Company.

      THIRD: That thereafter, at the annual meeting of the Company's
stockholders duly called and, upon notice in accordance with Section 222 of the
General Corporation Law of the State of Delaware, held on June 6, 1997 the
holders of a majority of the outstanding shares of capital stock of the Company
entitled to vote thereon approved the aforesaid amendment to the Certificate of
Incorporation.

      FOURTH:  That the aforesaid amendment was duly adopted in accordance
with the provisions of Section 242 of the General Corporation Law of the
State of Delaware.

      IN WITNESS WHEREOF, the Company has caused this Certificate of Amendment
to be signed by Joseph S. Bracewell III, as President of the Company this 24th
day of July, 1997.

                                      CENTURY BANCSHARES, INC.

                                By:   /s/ JOSEPH S. BRACEWELL III
                                      ------------------------------
                                      Joseph S. Bracewell III
                                      President

                                      -7-
<PAGE>   8

                                                             STATE OF DELAWARE
                                                            SECRETARY OF STATE
                                                      DIVISION OF CORPORATIONS
                                                     FILED 04:30 PM 03/08/2001
                                                           010117485 - 2066851

                            CERTIFICATE OF AMENDMENT
                                       OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                           CENTURY BANCSHARES, INC.

      Century Bancshares, Inc., a corporation duly organized and existing
under and by virtue of the General Corporation Law of the State of Delaware
(the "Company"), does hereby certify:

      FIRST: That the Board of Directors of the Company, at a meeting duly
called and held, at which meeting a quorum was present and acting throughout
(the "Board Meeting"), adopted a resolution proposing and declaring advisable
and in the best interest of the Company that the Company's Certificate of
Incorporation be amended by amending the first sentence of Article IV to read in
its entirety as follows:

      "The total number of shares of stock which the corporation shall have the
      authority to issue is 11,000,000 shares, of which 10,000,000 shares of the
      par value of $1.00 each shall be shares of common stock, and 1,000,000
      shares of the par value of $1.00 each shall be shares of preferred stock."

      SECOND: That at that Board Meeting, the Board directed that the preceding
proposed amendment to the Certificate of Incorporation be presented to the
stockholders of the Company entitled to vote thereon for their consideration and
recommended the adoption of such amendment by the stockholders of the Company.

      THIRD: That thereafter, at the annual meeting of the Company's
stockholders duly called and, upon notice in accordance with Section 222 of the
General Corporation Law of the State of Delaware, held on June 2, 2000, the
holders of a majority of the outstanding shares of capital stock of the Company
entitled to vote thereon approved the aforesaid amendment to the Certificate of
Incorporation.

      FOURTH:  That the aforesaid amendment was duly adopted in accordance
with the provisions of Section 242 of the General Corporation Law of the
State of Delaware.

      IN WITNESS WHEREOF, the Company has caused this Certificate of Amendment
to be signed by Joseph S. Bracewell, as President of the Company this 8th day of
March, 2001.

                                      CENTURY BANCSHARES, INC.

                                By:   /s/ JOSEPH S. BRACEWELL
                                      ------------------------------
                                      Joseph S. Bracewell,
                                      President

                                      -8-<PAGE>   1
                                                                     EXHIBIT 4.3

                               FWB Bancorporation
                        1994 Incentive Stock Option Plan

                         AMENDED AND RESTATED TO BE THE

                            CENTURY BANCSHARES, INC.
                        1994 INCENTIVE STOCK OPTION PLAN

                                   WITNESSETH:

         WHEREAS, the Board of Directors of FWB Bancorporation previously
adopted the FWB Bancorporation 1994 Incentive Stock Option Plan to be effective
on April 8, 1994; and

         WHEREAS, on May 6, 1997, FWB Bancorporation changed its name to
GrandBanc, Inc. ("GrandBanc"); and

         WHEREAS, dated as of October 11, 2000, GrandBanc, Century Bancshares,
Inc. ("Century") and CBI Holdings Corporation, a wholly-owned subsidiary of
Century ("CBI"), entered into that certain Agreement and Plan of Merger ("Merger
Agreement"), wherein it was agreed that in the year 2001, GrandBanc will merge
into CBI and CBI will be the surviving entity ("Merger"); and

         WHEREAS, in accordance with the Merger Agreement, the employee benefit
plans of GrandBanc and Century are to survive the Merger and the outstanding
options granted under the FWB Bancorporation 1994 Incentive Stock Option Plan
are to be converted into options to purchase shares of Century common stock,
with the adjustments provided for in the Merger Agreement; and

         WHEREAS, the FWB Bancorporation 1994 Incentive Stock Option Plan is to
be amended and restated as set forth below to continue such plan through the
Merger; and

         WHEREAS, the FWB Bancorporation 1994 Incentive Stock Option Plan is to
be renamed the Century Bancshares, Inc. 1994 Incentive Stock Option Plan.

I.       PURPOSE OF THE PLAN.

         The purpose of the Century Bancshares, Inc. (the "Corporation") 1994
Incentive Stock Option Plan (the "Plan") is to advance the interests of the
Corporation and its stockholders by providing those key employees of the
Corporation and its Affiliates, including Century National Bank ("Bank"), upon
whose judgment, initiative and efforts the successful conduct of the business of
the Corporation and its Affiliates largely depends, with additional incentive to
perform in a superior manner. A purpose of the Plan is also to attract people of
experience and ability to the service of the Corporation and its Affiliates.

<PAGE>   2

II.      DEFINITIONS.

         (a) "Affiliate" means (i) a member of a controlled group of
corporations of which the Corporation is a member or (ii) an unincorporated
trade or business which is under common control with the Corporation as
determined in accordance with Section 414(c) of the Internal Revenue Code of
1986, as amended, (the "Code") and the regulations issued thereunder. For
purposes hereof, a "controlled group of corporations" shall mean a controlled
group of corporations as defined in Section 1563(a) of the Code determined
without regard to Section 1563(a)(4) and (e)(3)(C).

         (b) "Award" means a grant of Non-statutory Stock Options, Incentive
Stock Options, and/or Limited Rights under the provisions of this Plan.

         (c) "Board of Directors" or "Board" means the board of directors of the
Corporation.

         (d) "Change in Control" means the occurrence of any of the following
events: (i) a change in the Corporation's status requiring prior notice to the
Board of Governors of the Federal Reserve System and/or the Office of the
Comptroller of the Currency pursuant to the Change in Bank Control Act of 1978
and regulations, 12 C.F.R. Section 5.50 and 225.41, promulgated thereunder; or
(ii) the acquisition by any person or group of persons (as such terms are
defined and used in Sections 3(a)(9) and 14(d)(2), respectively, of the 1934
Act) of beneficial ownership (as defined in Rule 13d-3 issued under the 1934
Act), directly or indirectly, of securities representing more than fifty percent
(50%) of the combined voting power of the then outstanding voting securities of
the Corporation or Bank entitled to vote generally in the election of directors
("Voting Securities"); or (iii) individuals who constitute the Board of the
Corporation on the date of this Plan ("Incumbent Board") cease for any reason to
constitute at least a majority of that Board, provided that any person becoming
a director subsequent to the date of this Plan whose election or whose
nomination for election by the Corporation's stockholders was approved by a
majority vote of the directors comprising the Incumbent Board shall be, for
purposes of this Plan, considered as though he or she were a member of the
Incumbent Board; or (iv) a recapitalization, reorganization, merger, or
consolidation with respect to which those persons (as defined above) who were
beneficial owners of the Voting Securities of the Corporation or the Bank
immediately prior to such recapitalization, reorganization, merger, or
consolidation do not, following such recapitalization, reorganization, merger,
or consolidation, beneficially own, directly or indirectly, shares representing
more than fifty percent (50%) of the combined voting power of the Voting
Securities of the Corporation resulting from such recapitalization,
reorganization, merger, or consolidation; or (v) a sale of all or substantially
all the assets of the Bank or the Corporation.

         (e) "Committee" means the Stock Option Committee of the Board, or
another committee of the Board designated by the Board after the date of
adoption of the Plan, which in either case shall be constituted solely of (i)
"non-employee directors" within the meaning of Rule 16b-3 and applicable
interpretive authority thereunder, and (ii) "outside directors" within the
meaning of Section 162(m) of the Code and applicable interpretive authority
thereunder.

                                      -2-
<PAGE>   3

         (f) "Common Stock" means the Common Stock of the Corporation, par value
$1.00 per share.

         (g) "Date of Grant" means the date an Award granted by the Committee is
effective pursuant to the terms hereof.

         (h) "Disability" means the permanent and total inability by reason of
mental or physical infirmity, or both, of an employee to perform the work
customarily assigned to him. Additionally, a medical doctor selected or approved
by the Board of Directors must advise the Committee that it is either not
possible to determine when such Disability will terminate or that it appears
probable that such Disability will be permanent during the remainder of said
participant's lifetime.

         (i) "Fair Market Value" means, when used in connection with Common
Stock on a certain date: (i) if the Common Stock is traded over the counter and
not on an established stock exchange, the average of the "bid" and "ask" prices
of the Common Stock in the over-the-counter market on the effective date of the
grant, but, if the Corporation's stock is not trading on such date, then on the
next preceding day on which the Common Stock was traded; notwithstanding the
preceding, if no trade has occurred in the Common Stock during the preceding
three months, or, if the value of the Common Stock cannot be determined by
averaging the "bid" and "ask" prices, then Fair Market Value will be determined
by requesting those individuals making a market in the Common Stock, based on an
actual bid or asked price, to determine an appropriate estimated spread, and
taking the average.

         (j) "Incentive Stock Option" means an Option granted by the Committee
to a Participant, which Option is designated as an Incentive Stock Option
pursuant to Section VIII.

         (k) "Limited Right" means the right to receive an amount of cash based
upon the terms set forth in Section IX.

         (l) "Non-statutory Stock Option" means an Option granted by the
Committee to a Participant and which is not designated by the Committee as an
Incentive Stock Option.

         (m) "Normal Retirement" means retirement at the normal or early
retirement date as set forth in any tax-qualified retirement/pension plan of the
Corporation.

         (n) "Option" means an Award granted under Section VII or Section VIII.

         (o) "Participant" means an employee of the Corporation or its
Affiliates chosen by the Committee to participate in the Plan.

         (p) "Plan Year(s)" means a calendar year or years commencing on or
after January 1, 1994.

         (q) "Termination for Cause" means the termination upon an intentional
failure to perform stated duties, breach of a fiduciary duty involving personal
dishonesty, which results in material loss to the Corporation or one of its
Affiliates or willful violation of any law, rule or

                                      -3-
<PAGE>   4

regulation (other than traffic violations or similar offenses) or final
cease-and-desist order which results in material loss to the Corporation or one
of its Affiliates.

III.     ADMINISTRATION.

         The Plan shall be administered by the Committee. The Committee is
authorized, subject to the provisions of the Plan, to establish such rules and
regulations as it sees necessary for the proper administration of the Plan and
to make whatever determinations and interpretations in connection with the Plan
it sets as necessary or advisable. All determinations and interpretations made
by the Committee shall be binding and conclusive on all Participants in the Plan
and on their legal representatives and beneficiaries.

IV.      TYPES OF AWARDS.

         Awards under the Plan may be granted in any one or a combination of:

         (a)      Non-statutory Stock Options;

         (b)      Incentive Stock Options; and

         (c)      Limited Rights

as defined below in Section VII through IX of the Plan.

V.       STOCK SUBJECT TO THE PLAN.

         Subject to adjustment as provided in Section XIV, the maximum number of
shares reserved for purchase pursuant to the exercise of Options granted under
the Plan shall not exceed 66,360 shares of Common Stock, subject to adjustments
pursuant to this Section V. These shares of Common Stock may be either
authorized but unissued shares or shares previously issued and reacquired by the
Corporation as treasury stock. To the extent that Options or Limited Rights are
granted under the Plan, the shares underlying such Options will be unavailable
for future grants under the Plan except that, to the extent that Options
together with any related Limited Rights granted under the Plan terminate,
expire or are cancelled without having been exercised (in the case of Limited
Rights, exercised for cash) new Awards may be made with respect to these shares.

VI.      ELIGIBILITY.

         Officers and other employees of the Corporation or its Affiliates shall
be eligible to receive Non-statutory Stock Options, Incentive Stock Options
and/or Limited Rights under the Plan. Directors who are not employees or
officers of the Corporation or its Affiliates shall not be eligible to receive
Awards under the Plan.

                                      -4-
<PAGE>   5

VII.     GRANT OF NON-STATUTORY STOCK OPTIONS.

         The Committee may, from time to time, grant Non-statutory Stock Options
to eligible employees and, upon such terms and conditions as the Committee may
determine, grant Non-statutory Stock Options in exchange for and upon surrender
of previously granted Awards under this Plan. Non-statutory Stock Options
granted under this Plan are subject to the following terms and conditions:

         (a) Price. The purchase price per share of Common Stock deliverable
upon the exercise of each Non-statutory Stock Option shall be determined by the
Committee on the date the Option is granted. In general, such purchase price
shall not be less than 100% of the Fair Market Value of the Common Stock on the
Date of Grant. Shares may be purchased only upon full payment of the purchase
price. Payment of the purchase price may be made, in whole or in part, through
the surrender of shares of the Common Stock at the Fair Market Value of such
shares on the date of surrender determined in the manner described in Section
II(i).

         (b) Terms of Options. The term during which each Non-statutory Stock
Option may be exercised shall be determined by the Committee, but in no event
shall a Non-statutory Stock Option be exercisable in whole or in part more than
ten (10) years from the Date of Grant. The Committee may determine the date on
which each Non-statutory Stock Option shall become exercisable and may provide
that a Non-statutory Stock Option shall become exercisable in installments. The
shares comprising each installment may be purchased in whole or in part at any
time after such installment becomes purchasable. The Committee may, in its sole
discretion, accelerate the time at which any Non-statutory Stock Option may be
exercised in whole or in part. Notwithstanding the above, in the event of a
Change in Control, all Non-statutory Stock Options shall become immediately
exercisable.

         (c) Termination of Employment. Unless otherwise determined by the
Committee at the time a Non-statutory Stock Option is granted, upon the
termination of a Participant's service for any reason other than Disability,
Normal Retirement, Change in Control, death or Termination for Cause, the
Participant's Non-statutory Stock Options shall be exercisable only as to those
shares which were immediately purchasable by the Participant at the date of
termination and only for a period of three (3) months following termination.
Notwithstanding any provision set forth herein nor contained in any Agreement
relating to the award of a Non-statutory Stock Option, in the event of
Termination for Cause, all rights under the Participant's Non-statutory Stock
Options shall expire upon termination. Unless otherwise determined by the
Committee at the time a Non-statutory Stock Option is granted, in the event of
the death, Disability or Normal Retirement of any Participant, all Non-statutory
Stock Options held by the Participant, whether or not exercisable at such time,
shall be exercisable by the Participant or his legal representatives or
beneficiaries of the Participant for one (1) year or such longer period as
determined by the Committee following the date of the Participant's death,
Normal Retirement or cessation of employment due to Disability, provided that in
no event shall the period extend beyond the expiration of the Non-statutory
Stock Option term.

                                      -5-
<PAGE>   6

VIII.    GRANT OF INCENTIVE STOCK OPTIONS.

         The Committee may, from time to time, grant Incentive Stock Options to
eligible employees. Incentive Stock Options granted pursuant to the Plan shall
be subject to the following terms and conditions:

         (a) Price. The purchase price per share of Common Stock deliverable
upon the exercise of each Incentive Stock Option shall be not less than 100% of
the Fair Market Value of Common Stock on the Date of Grant. However, if a
Participant owns stock possessing more than 10% of the total combined voting
power of all classes of Common Stock of the Corporation, the purchase price per
share of Common Stock deliverable upon the exercise of each Incentive Stock
Option shall not be less than 110% of the Fair Market Value of the Common Stock
on the Date of Grant. Shares may be purchased only upon payment of the full
purchase price. Payment of the purchase price may be made, in whole or in part,
through the surrender of shares of the Common Stock at the Fair Market Value of
such shares on the date of surrender determined in the manner described in
Section II(i).

         (b) Amounts of Options. Incentive Stock Options may be granted to any
eligible employee in such amounts as determined by the Committee. In the case of
an Option intended to qualify as an Incentive Stock Option, the aggregate Fair
Market Value (determined as of the time the option is granted) of the Common
Stock with respect to which Incentive Stock Options granted are exercisable for
the first time by the Participant during any calendar year (under all plans of
the Participant's employer corporation and its parent and subsidiary
corporations) shall not exceed $100,000. The provisions of this Section VIII(b)
shall be construed and applied in accordance with Section 422(d) of the Code and
the regulations, if any, promulgated thereunder. To the extent an award under
this Section VIII exceeds this $100,000 limit, the portion of the award in
excess of such limit shall be deemed a Non-statutory Stock Option.

         (c) Terms of Options. The term during which each Incentive Stock Option
may be exercised shall be determined by the Committee, but in no event shall an
Incentive Stock Option be exercisable in whole or in part more than ten (10)
years from the Date of Grant. If at the time an Incentive Stock Option is
granted to an employee, the employee owns Common Stock representing more than
10% of the total combined voting power of the Corporation (or, under Section
425(d) of the Code, is deemed to own Common Stock representing more than 10% of
the total combined voting power of all such classes of Common Stock, by reason
of the ownership of such classes of Common Stock, directly or indirectly, by or
for any brother, sister, spouse, ancestor or lineal descendent of such employee,
or by or for any corporation, partnership, estate or trust of which such
employee is a stockholder, partner or beneficiary), the Incentive Stock Option
granted to such employee shall not be exercisable after the expiration of five
(5) years from the Date of Grant. No Incentive Stock Option granted under this
Plan is transferable except by will or the laws of descent and distribution and
is exercisable in his lifetime only by the employee to whom it is granted.

         The Committee shall determine the date on which each Incentive Stock
Option shall become exercisable and may provide that an Incentive Stock Option
shall become exercisable in installments. The shares comprising each installment
may be purchased in whole or in part at any

                                      -6-
<PAGE>   7

time after such installment becomes purchasable, provided that the amount able
to be first exercised in a given year is consistent with the terms of Section
422 of the Code. The Committee may, in its sole discretion, accelerate the time
at which any Incentive Stock Option may be exercised in whole or in part,
provided that it is consistent with the terms of Section 422 of the Code.
Notwithstanding the above, in the event of a Change in Control, all Incentive
Stock Options shall become immediately exercisable.

         (d) Termination of Employment. Upon the termination of a Participant's
service for any reason other than Disability, Normal Retirement, Change in
Control, death or Termination for Cause, the Participant's Incentive Stock
Options shall be exercisable only as to those shares which were immediately
purchasable by the Participant at the date of termination and only for a period
of three (3) months following termination. In the event of Termination for
Cause, all rights under the Participant's Incentive Stock Options shall expire
upon termination.

         In the event of death or Disability of any employee, all Incentive
Stock Options held by such Participant, whether or not exercisable at such time,
shall be exercisable by the Participant or the Participant's legal
representatives or beneficiaries for one (1) year following the date of the
Participant's death or cessation of employment due to Disability. Upon
termination of the Participant's service due to Normal Retirement, or a Change
in Control, all Incentive Stock Options held by such Participant, whether or not
exercisable at such time, shall be exercisable. for a period of one (1) year
following the date of Participant's cessation of employment, provided however,
that such Option shall not be eligible for treatment as an Incentive Stock
Option in the event such Option is exercised more than three (3) months
following the date of the Participant's Normal Retirement. In no event shall the
exercise period extend beyond the expiration of the Incentive Stock Option term.

         (e) Compliance with Code. The Options granted under this Section VIII
of the Plan are intended to qualify as incentive stock options within the
meaning of Section 422 of the Code, but the Corporation makes no warranty as to
the qualification of any Option as an incentive stock option within the meaning
of Section 422 of the Code.

IX.      GRANT OF LIMITED RIGHTS.

         Simultaneously with the grant of any Option, the Committee may grant a
Limited Right with respect to all or some of the shares covered by such Option.
Limited Rights granted under this Plan are subject to the following terms and
conditions:

         (a) Terms of Right. In no event shall a Limited Right be exercisable in
whole or in part before the expiration of six months from the Date of Grant of
the Limited Right. A Limited Right may be exercised only in the event of a
Change in Control.

         The Limited Right may be exercised only when the underlying option is
eligible to be exercised, and only when the Fair Market Value of the underlying
shares on the day of exercise is greater than the exercise price of the related
Option.

                                      -7-
<PAGE>   8

         Upon exercise of a Limited Right, the related Option shall cease to be
exercisable. Upon exercise or termination of an Option, any related Limited
Rights shall terminate. The Limited Rights may be for no more than 100% of the
difference between the exercise price and the Fair Market Value of the Common
Stock subject to the underlying Option. The Limited Right is transferable only
when the underlying Option is transferable and under the same conditions.

         (b) Payment. Upon exercise of a Limited Right, the holder shall
promptly receive from the Corporation an amount of cash equal to the difference
between the Fair Market Value on the Date of Grant of the related Option and the
Fair Market Value of the underlying shares on the date the Limited Right is
exercised, multiplied by the number of shares with respect to which such Limited
Right is being exercised.

         (c) Termination of Employment. Upon the termination of a Participant's
service for any reason other than Termination for Cause, any Limited Rights held
by the Participant shall then be exercisable for a period of one (1) year
following termination. In the event of Termination for Cause, all Limited Rights
held by the Participant shall expire immediately. Upon termination of the
Participant's employment for reason of death, Normal Retirement or Disability,
all Limited Rights held by such Participant shall be exercisable by the
Participant or the Participant's legal representative or beneficiaries for a
period of one (1) year from the date of such termination. In no event shall the
period extend beyond the expiration of the term of the related option.

X.       SURRENDER OPTION.

         In the event of a Participant's termination of employment as a result
of death, Disability or Normal Retirement, the Participant (or the Participant's
personal representative(s), heir(s), or devisee(s)) may, in a form acceptable to
the Committee, make application to surrender all or part of Options held by such
Participant in exchange for a cash payment from the Corporation of an amount
equal to the difference between the Fair Market Value of the Common Stock on the
date of termination of employment and the exercise price per share of the Option
on the Date of Grant. Whether the Committee accepts such application or
determines to make payment, in whole or part, is within its absolute and sole
discretion, it being expressly understood that the Committee is under no
obligation to any Participant whatsoever to make such payments. In the event
that the Committee accepts such application and the Corporation determines to
make payment, such payment shall be in lieu of the exercise of the underlying
Option and such Option shall cease to be exercisable.

XI.      RIGHTS OF A STOCKHOLDER: NONTRANSFERABILITY.

         No Participant shall have any rights as a stockholder with respect to
any shares covered by a Non-statutory Stock Option and/or Incentive Stock Option
until the date of issuance of a stock certificate for such shares. Nothing in
this Plan or in any Award granted confers on any person any right to continue in
the employ of the Corporation or its Affiliates or to continue to perform
services for the Corporation or its Affiliates or interferes in any way with the
right of the Corporation or its Affiliates to terminate a Participant's services
as an officer or other employee at any time.

                                      -8-
<PAGE>   9

         No Award under the Plan shall be transferable by a Participant other
than by will or the laws of descent and distribution and may only be exercised
during his lifetime by the Participant, or by a guardian or legal
representative.

XII.     AGREEMENT WITH GRANTEES.

         Each Award of Options, and/or Limited Rights will be evidenced by a
written agreement, executed by the Participant and the Corporation or its
Affiliates which describes the conditions for receiving the Awards including the
date of Award, the purchase price if any, applicable periods, and any other
terms and conditions as may be required by the Board of Directors or applicable
securities law.

XIII.    DESIGNATION OF BENEFICIARY.

         A Participant may, with the consent of the Committee, designate a
person or persons to receive, in the event of death, any Option or Limited
Rights Award to which the Participant would then be entitled. Such designation
will be made upon forms supplied by and delivered to the Corporation and may be
revoked in writing. If a Participant fails effectively to designate a
beneficiary, then the Participant's estate will be deemed to be the beneficiary.

XIV.     DILUTION AND OTHER ADJUSTMENTS,

         In the event of any change in the outstanding shares of Common Stock by
reason of any stock dividend or split, recapitalization, merger, consolidation,
spin-off, reorganization, combination or exchange of shares, or other similar
corporate change, or other increase or decrease in such shares without receipt
or payment of consideration by the Corporation, the Committee will make such
adjustments to previously granted Awards, to prevent dilution or enlargement of
the rights of the Participant, including any or all of the following:

         (a) adjustments in the aggregate number or kind of shares of Common
Stock which may be awarded under the Plan;

         (b) adjustments in the aggregate number or kind of shares of Common
Stock covered by Awards already made under the Plan;

         (c) adjustments in the purchase price of outstanding Incentive and/or
Non-statutory Stock Options, or any Limited Rights attached to such Options.

         No such adjustments may, however, materially change the value of
benefits available to a Participant under a previously granted Award.

XV.      TAX WITHHOLDING.

         There shall be deducted from each distribution of cash and/or Common
Stock under the Plan the amount required by any governmental authority to be
withheld for income tax purposes.

                                      -9-
<PAGE>   10

XVI.     AMENDMENT OF THE PLAN.

         The Board of Directors may at any time, and from time to time, modify
or amend the Plan in any respect; provided further that if it has been
determined to continue to qualify the Plan under Rule 16b-3, stockholder
approval shall be required far any such modification or amendment which;

         (a) increases the maximum number of shares for which Options may be
granted under the Plan (subject, however, to the provisions of Section XIV
hereof);

         (b) reduces the exercise price at which Awards may be granted (subject,
however, to the provisions of Section XIV hereof);

         (c) extends the period during which Options may be granted or exercised
beyond the times originally prescribed; or

         (d) changes the persons eligible to participate in the Plan.

         Failure to ratify or approve amendments or modifications to subsections
(a) through (d) of this Section by stockholders shall be effective only as to
the specific amendment or modification requiring such ratification. Other
provisions, sections, and subsections of this Plan will remain in full force and
effect.

         No such termination, modification or amendment may affect the rights of
a Participant under an outstanding Award.

XVII.    EFFECTIVE DATE OF PLAN.

         The Plan became effective upon adoption by the Board of Directors of
FWB Bancorporation on April 8, 1994 (the "Effective Date"). The Plan was
presented and approved by the stockholders of FWB Bancorporation for the
purposes of: (i) obtaining favorable treatment under Section 16(b) of the
Exchange Act; and (ii) satisfying one of the requirements of Section 422 of the
Code governing the tax treatment for Incentive Stock Options.

XVIII.   TERMINATION OF THE PLAN.

         The right to grant Awards under the Plan will terminate upon the
earlier of ten (10) years after the Effective Date of the Plan or the issuance
of Common Stock or the exercise of Options or related Limited Rights equivalent
to the maximum number of shares reserved under the Plan as set forth in Section
V. The Board of Directors has the right to suspend or terminate the Plan at any
time, provided that no such action will, without the consent of a Participant,
adversely affect his rights under a previously granted Award.

XIX.     APPLICABLE LAW.

         The Plan will be administered in accordance with the laws of the State
of Delaware to the extent not preempted by Federal law.

                                      -10-
<PAGE>   11

XX.      COMPLIANCE WITH SECTION 16.

         If this Plan is qualified under Rule 16b-3, with respect to persons
subject to Section 16 of the Exchange Act, transactions under this Plan are
intended to comply with all applicable conditions of Rule 16b-3 or its
successors under the Exchange Act. To the extent any provisions of the Plan or
any actions by the Committee fail to so comply, it shall be deemed null and
void, to the extent permitted by law and deemed advisable by the Committee.

         Adopted by the Board of Directors of FWB Bancorporation on May 12, 1994
and amended and restated by the Board of Directors of Century Bancshares, Inc.
on March 15, 2001.

                                              CENTURY BANCSHARES, INC.

                                              /s/ JOSEPH S. BRACEWELL
                                              ----------------------------------
                                              Joseph S. Bracewell, Chairman of
                                              the Board, President, and
                                              Chief Executive Officer

                                      -11-

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