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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Parent Company [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital Amount $ 728,635 $ 669,213
Total Capital To Risk Weighted Assets Actual Ratio 15.33% 14.47%
Capital Required For Capital Adequacy Amount $ 380,351 $ 370,094
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00% 8.00%
Capital With Capital Conservation Buffer Amount $ 410,066  
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 8.625% 8.625%
Common Equity Tier 1 Risk Based Capital Amount $ 648,942 $ 596,547
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.65% 12.90%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 213,947 $ 208,178
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio 4.50% 4.50%
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount $ 243,662  
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 5.125% 5.125%
Tier 1 Risk Based Capital Amount $ 679,942 $ 627,547
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 14.30% 13.57%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 285,263 $ 277,570
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio 6.00% 6.00%
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount $ 314,978  
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 6.625% 6.625%
Tier 1 Capital Amount $ 679,942 $ 627,547
Tier 1 Capital To Average Assets Ratio 9.94% 9.49%
Tier 1 Capital Required For Capital Adequacy Amount $ 273,510 $ 264,333
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00% 4.00%
BancFirst [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital Amount $ 655,620 $ 607,604
Total Capital To Risk Weighted Assets Actual Ratio 13.80% 13.15%
Capital Required For Capital Adequacy Amount $ 379,948 $ 369,607
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00% 8.00%
Capital With Capital Conservation Buffer Amount $ 409,631  
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 8.625% 8.625%
Capital Required To Be Well Capitalized Amount $ 474,934 $ 462,009
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00% 10.00%
Common Equity Tier 1 Risk Based Capital Amount $ 586,927 $ 545,938
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.36% 11.82%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 213,720 $ 207,904
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio 4.50% 4.50%
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount $ 243,404  
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 5.125% 5.125%
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 308,707 $ 300,306
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 6.50% 6.50%
Tier 1 Risk Based Capital Amount $ 606,927 $ 565,938
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.78% 12.25%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 284,961 $ 277,205
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio 6.00% 6.00%
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount $ 314,644  
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 6.625% 6.625%
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 379,948 $ 369,607
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00% 8.00%
Tier 1 Capital Amount $ 606,927 $ 565,938
Tier 1 Capital To Average Assets Ratio 8.89% 8.59%
Tier 1 Capital Required For Capital Adequacy Amount $ 273,152 $ 263,606
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00% 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount $ 341,440 $ 329,507
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio 5.00% 5.00%