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Stockholders' Equity (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Required capital amounts and company respective ratios
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.00%
Tier 1 Capital Required To Be Well Capitalized To Average assets Ratio	5.00%
BancFirst Corporation [Member]
Required capital amounts and company respective ratios
Total Capital To Risk Weighted Assets Actual Amount	510,604
Total Capital To Risk Weighted Assets Actual Ratio	14.74%
Capital required For Capital Adequacy Amount	277,168
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%
Tier 1 Risk Based Capital Amount	473,346
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.66%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	138,584
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.00%
Tier 1 Capital Amount	473,346
Tier 1 Capital To Average Assets Ratio	8.19%
Tier 1 Capital Required For Capital Adequacy Amount	175,150
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	3.00%
BancFirst [Member]
Required capital amounts and company respective ratios
Total Capital To Risk Weighted Assets Actual Amount	485,030
Total Capital To Risk Weighted Assets Actual Ratio	14.04%
Capital required For Capital Adequacy Amount	276,288
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%
Capital Required To Be Well Capitalized Amount	345,360
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00%
Tier 1 Risk Based Capital Amount	447,772
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	12.97%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	138,144
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.00%
Tier 1 Risk Based Capital Required To Be well Capitalized Amount	207,216
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.00%
Tier 1 Capital Amount	447,772
Tier 1 Capital To Average Assets Ratio	7.76%
Tier 1 Capital Required For Capital Adequacy Amount	174,503
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	3.00%
Tier 1 Capital Required To Be Well Capitalized Amount	290,839
Tier 1 Capital Required To Be Well Capitalized To Average assets Ratio	5.00%

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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