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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail)
$ in Thousands
Jun. 30, 2018
USD ($)
Parent Company [Member]  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Total Capital Amount $ 851,222
Total Capital To Risk Weighted Assets Actual Ratio 15.80%
Capital Required For Capital Adequacy Amount $ 430,907
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 424,174
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 9.875%
Common Equity Tier 1 Risk Based Capital Amount $ 768,022
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 14.26%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 242,385
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 With Capital Conservation Buffer Amount $ 343,379
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 6.375%
Tier 1 Risk Based Capital Amount $ 799,022
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 14.83%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 323,180
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio 6.00%
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount $ 531,901
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.875%
Tier 1 Capital Amount $ 799,022
Tier 1 Capital To Average Assets Ratio 10.67%
Tier 1 Capital Required For Capital Adequacy Amount $ 299,443
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 $ 731,628
Total Capital To Risk Weighted Assets Actual Ratio 13.75%
Capital Required For Capital Adequacy Amount $ 425,551
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 525,290
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 9.875%
Capital Required To Be Well Capitalized Amount $ 531,939
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00%
Common Equity Tier 1 Risk Based Capital Amount $ 659,428
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.40%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 239,373
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 With Capital Conservation Buffer Amount $ 339,111
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 6.375%
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 345,760
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 6.50%
Tier 1 Risk Based Capital Amount $ 679,428
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.77%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 319,163
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio 6.00%
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount $ 418,902
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.875%
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 425,551
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00%
Tier 1 Capital Amount $ 679,428
Tier 1 Capital To Average Assets Ratio 9.18%
Tier 1 Capital Required For Capital Adequacy Amount $ 295,894
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount $ 369,868
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio 5.00%