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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 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	$ 575,607
Total Capital To Risk Weighted Assets Actual Ratio	14.47%
Capital Required For Capital Adequacy Amount	325,487
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%
Tier 1 Risk Based Capital Amount	545,570
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.41%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	162,744
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	4.00%
Tier 1 Capital Amount	545,570
Tier 1 Capital To Average Assets Ratio	8.64%
Tier 1 Capital Required For Capital Adequacy Amount	191,060
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	553,957
Total Capital To Risk Weighted Assets Actual Ratio	13.55%
Capital Required For Capital Adequacy Amount	324,918
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00%
Capital Required To Be Well Capitalized Amount	406,147
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00%
Tier 1 Risk Based Capital Amount	507,016
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	12.48%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	162,459
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	243,688
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.00%
Tier 1 Capital Amount	507,016
Tier 1 Capital To Average Assets Ratio	8.05%
Tier 1 Capital Required For Capital Adequacy Amount	190,452
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	3.00%
Tier 1 Capital Required To Be Well Capitalized Amount	$ 317,420
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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