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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
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	$ 573,963
Total Capital To Risk Weighted Assets Actual Ratio	14.52%
Capital Required For Capital Adequacy Amount	316,297
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%
Tier 1 Risk Based Capital Amount	534,039
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.51%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	158,148
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.00%
Tier 1 Capital Amount	534,039
Tier 1 Capital To Average Assets Ratio	8.45%
Tier 1 Capital Required For Capital Adequacy Amount	191,252
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	3.00%
BancFirst [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital To Risk Weighted Assets Actual Amount	537,600
Total Capital To Risk Weighted Assets Actual Ratio	13.62%
Capital Required For Capital Adequacy Amount	315,685
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%
Capital Required To Be Well Capitalized Amount	394,606
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00%
Tier 1 Risk Based Capital Amount	497,676
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	12.61%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	157,842
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	236,763
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.00%
Tier 1 Capital Amount	497,676
Tier 1 Capital To Average Assets Ratio	7.89%
Tier 1 Capital Required For Capital Adequacy Amount	190,650
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	3.00%
Tier 1 Capital Required To Be Well Capitalized Amount	$ 317,750
Tier 1 Capital Required To Be Well Capitalized To Average assets Ratio	5.00%

X

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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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