BANCFIRST CORPORATION ANNOUNCES AGREEMENT TO SELL CENTURY LIFE ASSURANCE COMPANY

                                                                    Exhibit 99.1

  BANCFIRST CORPORATION ANNOUNCES AGREEMENT TO SELL CENTURY LIFE ASSURANCE
                                     COMPANY

    OKLAHOMA CITY, Sept. 19 /PRNewswire-FirstCall/ -- BancFirst (Nasdaq: BANF)
and Pickard Limited Partnership have entered into an agreement to sell their
ownership in Century Life Assurance Company, 75% and 25%, respectively, to
American Underwriters Life Insurance Company. American Underwriters will acquire
all of the outstanding common stock of Century Life Assurance Company. Pickard
Limited Partnership is an affiliate of BancFirst Corporation. The transaction is
expected to be completed in the fourth quarter, subject to regulatory approvals.
BancFirst will continue to offer Century Life insurance products through its
banking offices. BancFirst Corporation said the sale will result in an after-tax
gain approximating $400,000 to $600,000, and will not have a significant impact
on its results of operations for 2007.

    American Underwriters Life Insurance Company is an Arizona-domiciled
insurance company with its administrative offices based in Wichita, Kansas and
offers insurance p