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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital Required To Be Well Capitalized To Average assets Ratio	5.00%
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.00%
BancFirst Corporation [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital Amount	$ 513,521
Tier 1 Capital To Average Assets Ratio	8.75%
Tier 1 Capital Required For Capital Adequacy Amount	177,802
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	3.00%
Tier 1 Risk Based Capital Amount	513,521
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.68%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	150,141
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.00%
Total Capital To Risk Weighted Assets Actual Amount	552,380
Total Capital To Risk Weighted Assets Actual Ratio	14.72%
Capital Required For Capital Adequacy Amount	300,282
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%
BancFirst [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital Amount	481,594
Tier 1 Capital To Average Assets Ratio	8.22%
Tier 1 Capital Required For Capital Adequacy Amount	177,207
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	3.00%
Tier 1 Capital Required To Be Well Capitalized Amount	295,346
Tier 1 Capital Required To Be Well Capitalized To Average assets Ratio	5.00%
Tier 1 Risk Based Capital Amount	481,594
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	12.86%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	149,803
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	224,704
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.00%
Total Capital To Risk Weighted Assets Actual Amount	520,453
Total Capital To Risk Weighted Assets Actual Ratio	13.90%
Capital Required For Capital Adequacy Amount	299,606
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%
Capital Required To Be Well Capitalized Amount	$ 374,507
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00%

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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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