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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
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%
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital To Risk Weighted Assets Actual Amount	$ 563,873	$ 522,095
Total Capital To Risk Weighted Assets Actual Ratio	14.85%	14.36%
Capital Required For Capital Adequacy Amount	303,700	290,882
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%	8.00%
Tier 1 Risk Based Capital Amount	524,839	483,370
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.83%	13.29%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	151,850	145,441
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.00%	4.00%
Tier 1 Capital Amount	524,839	483,370
Tier 1 Capital To Average Assets Ratio	8.77%	8.10%
Tier 1 Capital Required For Capital Adequacy Amount	181,174	180,728
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	3.00%	3.00%
BancFirst [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital To Risk Weighted Assets Actual Amount	529,200	493,621
Total Capital To Risk Weighted Assets Actual Ratio	13.96%	13.61%
Capital Required For Capital Adequacy Amount	303,190	290,236
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%	8.00%
Capital Required To Be Well Capitalized Amount	378,988	362,795
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00%	10.00%
Tier 1 Risk Based Capital Amount	490,166	454,896
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	12.93%	12.54%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	151,595	145,118
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.00%	4.00%
Tier 1 Risk Based Capital Required To Be well Capitalized Amount	227,393	217,677
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.00%	6.00%
Tier 1 Capital Amount	490,166	454,896
Tier 1 Capital To Average Assets Ratio	8.20%	7.63%
Tier 1 Capital Required For Capital Adequacy Amount	180,606	180,137
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	3.00%	3.00%
Tier 1 Capital Required To Be Well Capitalized Amount	$ 301,011	$ 300,228
Tier 1 Capital Required To Be Well Capitalized To Average assets Ratio	5.00%	5.00%

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The amount of total capital as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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