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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2012
Stockholders' Equity [Abstract]  
Summary of shares repurchased under stock purchase program
                                 
    Three Months Ended
June 30,
    Six Months Ended
June 30,
 
    2012     2011     2012     2011  

Number of shares repurchased

    6,787       117,176       6,787       117,176  

Average price of shares repurchased

  $ 37.70     $ 37.75     $ 37.70     $ 37.75  

Shares remaining to be repurchased

    234,964       426,724       234,964       426,724  
Required capital amounts and the Company's respective ratios
                                                 
    Actual     For Capital
Adequacy
Purposes
    To Be Well
Capitalized Under
Prompt Corrective
Action Provisions
 
    Amount     Ratio     Amount     Ratio     Amount     Ratio  
    (Dollars in thousands)  

As of June 30, 2012:

                                               

Total Capital

                                               

(to Risk Weighted Assets)-

                                               

BancFirst Corporation

  $ 500,048       14.62   $ 273,588       8.00     N/A       N/A  

BancFirst

    475,563       13.94     272,894       8.00   $ 341,118       10.00

Tier 1 Capital

                                               

(to Risk Weighted Assets)-

                                               

BancFirst Corporation

  $ 462,612       13.53   $ 136,794       4.00     N/A       N/A  

BancFirst

    438,127       12.84     136,447       4.00   $ 204,671       6.00

Tier 1 Capital

                                               

(to Total Assets)-

                                               

BancFirst Corporation

  $ 462,612       8.24   $ 170,193       3.00     N/A       N/A  

BancFirst

    438,127       7.81     169,614       3.00   $ 282,690       5.00