SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                  SCHEDULE 13G

                   Under the Securities Exchange Act of 1934
                                (Amendment No. 3)


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

                      (Name of Issuer) BancFirst Corporation
                   (Title of Class of Securities) Common Stock
                            (CUSIP Number) 05945F103


                                December 31, 2000
             (Date of Event Which Requires Filing of This Statement)


Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

    [ X ] Rule 13d-1(b)
    [   ] Rule 13d-1(c)
    [   ] Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which
would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section
of the Act but shall be subject to all other provisions of the Act (however,
see the Notes).

CUSIP NO. 05945F103                   13G                      Page 1 of 4 Pages


CUSIP No. 05945F103

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(1)   Names of Reporting Persons:  Investors Trust Company
      S.S. or I.R.S. Identification Nos. of Above Persons:  73-0737662

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(2)   Check the Appropriate Box if a Member of a Group
      (A)   [     ]
      (B)   [     ]

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(3)   SEC Use Only

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(4)   Citizenship or Place of Organization:  Oklahoma

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Number of                              (5)  Sole Voting Power            117,655
Shares Bene-                           -----------------------------------------
ficially                               (6)  Shared Voting Power          200,295
Owned by Each                          -----------------------------------------
Reporting                              (7)  Sole Dispositive Power       466,626
Person With:                           -----------------------------------------
                                       (8)  Shared Dispositive Power     200,295
                                       -----------------------------------------

(9)   Aggregate Amount Beneficially Owned by Each Reporting Person:  666,921

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(10)  Check if the Aggregate Amount in Row 9 Excludes Certain Shares:  [     ]

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(11)  Percent of Class Represented by Amount in Row 9:  8.014%

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(12)  Type of Reporting Person:  BK

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CUSIP NO. 05945F103                   13G                      Page 2 of 4 Pages


ITEM 1.
    (a)   Name of Issuer:  BancFirst Corporation
    (b)   Address of Issuer's Principal Executive Offices:
              101 N. Broadway
              Suite 200
              Oklahoma City, Oklahoma 73102

ITEM 2.
    (a)   Name of Person Filing:  Investors Trust Company
    (b)   Address of Principal Business Office:
              1202 North Tenth Street
              Duncan, Oklahoma 73533
    (c)   Citizenship:  Oklahoma
    (d)   Title of Class of Securities:  Common Stock
    (e)   CUSIP Number:  05945F103

ITEM 3.   If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b),
          check whether the person filing is a:

    a.    [ ]   Broker or Dealer registered under Section 15 of the Act
    b.    [X]   Bank as defined in Section 3(a)(6) of the Act
    c.    [ ]   Insurance Company as defined in Section 3(a)(19) of the Act
    d.    [ ]   Investment company registered under Section 8 of the Investment
                Company Act
    e.    [ ]   Investment Adviser registered under Section 203 of the
                Investment Advisers Act of 1940
    f.    [ ]   Employee Benefit Plan, Pension Fund which is subject to the
                provisions of the Employee Retirement Income Security Act of
                1974 or Endowment Fund; see Rule 13d-1(b)(1)(ii)(F)
    g.    [ ]   Parent holding company, in accordance with Rule 13d-a(b)(ii)(G)
                Note:  See item 7
    h.    [ ]   Group, in accordance with Rule 13d-a(b)(1)(ii)(H)

ITEM 4.   Ownership

    a.    Amount Beneficially Owned:  666,921
    b.    Percent of Class:  8.014%
    c.    Number of shares as to which the person has:
          (i)   sole power to vote or to direct the vote:  117,655
          (ii)  shared power to vote or to direct the vote:  200,295
          (iii) sole power to dispose or to direct the disposition of: 466,626
          (iv)  shared power to dispose or to direct the disposition of: 200,295

CUSIP NO. 05945F103                   13G                      Page 3 of 4 Pages


          All of the foregoing shares are held by Investors Trust Company in
          its fiduciary capacity as trustee or co-trustee of various trusts.

ITEM 5.   Ownership of 5 Percent or Less of a Class:  Not Applicable

ITEM 6.   Ownership of More than 5 Percent on Behalf of Another Person:  Not
          Applicable

ITEM 7.   Identification and Classification of the Subsidiary Which Acquired
          the Security Being Reported on By the Parent Holding Company:  Not
          Applicable

ITEM 8.   Identification and Classification of Members of the Group:  Not
          Applicable

ITEM 9.   Notice of Dissolution of Group:  Not Applicable


ITEM 10.  Certification

    By signing below, the undersigned certifies that to the best of my
    knowledge and belief, the securities referred to above were acquired in the
    ordinary course of business and were not acquired for the purpose of and do
    not have the effect of changing or influencing the control of the issuer of
    the securities and were not acquired with or as a participant in any
    transaction having such purposes or effect.

SIGNATURE.

    After reasonable inquiry and to the best of my knowledge and belief, the
undersigned certifies that the information set forth in this statement is
true, complete and correct.

    Date:  March 27, 2001.

                                       INVESTORS TRUST COMPANY


                                       By:  /s/ John R. Braught
                                            ------------------------------------
                                                      John R. Braught, President






CUSIP NO. 05945F103                   13G                      Page 4 of 4 Pages