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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail)
$ in Thousands
Jun. 30, 2020
USD ($)
Parent Company [Member]  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Total Capital Amount $ 960,793
Total Capital To Risk Weighted Assets Actual Ratio 14.83%
Capital Required For Capital Adequacy Amount $ 518,290
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 680,256
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50%
Common Equity Tier 1 Risk Based Capital Amount $ 853,705
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.18%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 291,538
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 $ 453,504
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.00%
Tier 1 Risk Based Capital Amount $ 879,705
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.58%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 388,718
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 $ 550,683
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 8.50%
Tier 1 Capital Amount $ 879,705
Tier 1 Capital To Average Assets Ratio 9.45%
Tier 1 Capital Required For Capital Adequacy Amount $ 372,344
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 $ 871,013
Total Capital To Risk Weighted Assets Actual Ratio 14.62%
Capital Required For Capital Adequacy Amount $ 476,462
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 625,357
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50%
Capital Required To Be Well Capitalized Amount $ 595,578
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00%
Common Equity Tier 1 Risk Based Capital Amount $ 776,428
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.04%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 268,010
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 $ 416,905
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.00%
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 387,126
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 $ 796,428
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.37%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 357,347
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 $ 506,241
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 8.50%
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 476,462
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00%
Tier 1 Capital Amount $ 796,428
Tier 1 Capital To Average Assets Ratio 9.33%
Tier 1 Capital Required For Capital Adequacy Amount $ 341,272
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount $ 426,591
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio 5.00%
Pegasus Bank [Member]  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Total Capital Amount $ 67,867
Total Capital To Risk Weighted Assets Actual Ratio 13.28%
Capital Required For Capital Adequacy Amount $ 40,893
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 53,672
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50%
Capital Required To Be Well Capitalized Amount $ 51,116
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00%
Common Equity Tier 1 Risk Based Capital Amount $ 63,636
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.45%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 23,002
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 $ 35,781
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.00%
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 33,226
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 $ 63,636
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.45%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 30,670
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 $ 43,449
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 8.50%
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 40,893
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00%
Tier 1 Capital Amount $ 63,636
Tier 1 Capital To Average Assets Ratio 8.34%
Tier 1 Capital Required For Capital Adequacy Amount $ 30,517
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount $ 38,146
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio 5.00%