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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) - Jun. 30, 2015 - USD ($)
$ in Thousands
Total
Parent Company [Member]  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Total Capital Amount $ 652,100
Total Capital To Risk Weighted Assets Actual Ratio 15.61%
Capital Required For Capital Adequacy Amount $ 334,229
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Common Equity Tier 1 Risk Based Capital Amount $ 583,479
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.97%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 188,004
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio 4.50%
Tier 1 Risk Based Capital Amount $ 609,479
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 14.59%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 250,672
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio 6.00%
Tier 1 Capital Amount $ 609,479
Tier 1 Capital To Average Assets Ratio 9.45%
Tier 1 Capital Required For Capital Adequacy Amount $ 259,959
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00%
BancFirst [Member]  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Total Capital Amount $ 598,091
Total Capital To Risk Weighted Assets Actual Ratio 14.40%
Capital Required For Capital Adequacy Amount $ 332,259
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital Required To Be Well Capitalized Amount $ 415,324
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00%
Common Equity Tier 1 Risk Based Capital Amount $ 535,470
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.89%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 186,896
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio 4.50%
Common Equity Tier 1 Risk Based Capital Required To Be well Capitalized Amount $ 269,960
Common Equity Tier 1 Risk Based Capital Required To Be well Capitalized Amount 6.50%
Tier 1 Risk Based Capital Amount $ 555,470
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.37%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 249,194
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio 6.00%
Tier 1 Risk Based Capital Required To Be well Capitalized Amount $ 332,259
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00%
Tier 1 Capital Amount $ 555,470
Tier 1 Capital To Average Assets Ratio 8.62%
Tier 1 Capital Required For Capital Adequacy Amount $ 259,366
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount $ 324,207
Tier 1 Capital Required To Be Well Capitalized To Average assets Ratio 5.00%