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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Parent Company [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital Amount $ 797,015 $ 728,635
Total Capital To Risk Weighted Assets Actual Ratio 15.62% 15.33%
Capital Required For Capital Adequacy Amount $ 408,234 $ 380,351
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00% 8.00%
Capital With Capital Conservation Buffer Amount $ 472,020 $ 410,066
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 9.25% 8.625%
Common Equity Tier 1 Risk Based Capital Amount $ 714,349 $ 648,942
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 14.00% 13.65%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 229,632 $ 213,947
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 $ 293,418 $ 243,662
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 5.75% 5.125%
Tier 1 Risk Based Capital Amount $ 745,349 $ 679,942
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 14.61% 14.30%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 306,175 $ 285,263
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 $ 369,962 $ 314,978
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.25% 6.625%
Tier 1 Capital Amount $ 745,349 $ 679,942
Tier 1 Capital To Average Assets Ratio 10.44% 9.94%
Tier 1 Capital Required For Capital Adequacy Amount $ 285,444 $ 273,510
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 $ 714,964 $ 655,620
Total Capital To Risk Weighted Assets Actual Ratio 14.03% 13.80%
Capital Required For Capital Adequacy Amount $ 407,698 $ 379,948
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00% 8.00%
Capital With Capital Conservation Buffer Amount $ 471,401 $ 409,631
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 9.25% 8.625%
Capital Required To Be Well Capitalized Amount $ 509,622 $ 474,934
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00% 10.00%
Common Equity Tier 1 Risk Based Capital Amount $ 643,298 $ 586,927
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.62% 12.36%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 229,330 $ 213,720
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 $ 293,033 $ 243,404
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 5.75% 5.125%
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 331,255 $ 308,707
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 $ 663,298 $ 606,927
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.02% 12.78%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 306,773 $ 284,961
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 $ 369,476 $ 314,644
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.25% 6.625%
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 407,698 $ 379,948
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00% 8.00%
Tier 1 Capital Amount $ 663,298 $ 606,927
Tier 1 Capital To Average Assets Ratio 9.31% 8.89%
Tier 1 Capital Required For Capital Adequacy Amount $ 285,101 $ 273,152
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00% 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount $ 356,677 $ 341,440
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio 5.00% 5.00%