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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail)
$ in Thousands
Jun. 30, 2021
USD ($)
Parent Company [Member]  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Total Capital Amount $ 1,123,056
Total Capital To Risk Weighted Assets Actual Ratio 17.35
Capital Required For Capital Adequacy Amount $ 517,721
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00
Capital With Capital Conservation Buffer Amount $ 679,508
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50
Common Equity Tier 1 Risk Based Capital Amount $ 956,969
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 14.79
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 291,218
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 $ 453,006
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.00
Tier 1 Risk Based Capital Amount $ 982,969
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 15.19
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 388,291
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 $ 550,078
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 8.50
Tier 1 Capital Amount $ 982,969
Tier 1 Capital To Average Assets Ratio 9.23
Tier 1 Capital Required For Capital Adequacy Amount $ 425,962
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 $ 954,496
Total Capital To Risk Weighted Assets Actual Ratio 16.23
Capital Required For Capital Adequacy Amount $ 470,400
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00
Capital With Capital Conservation Buffer Amount $ 617,400
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50
Capital Required To Be Well Capitalized Amount $ 588,000
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00
Common Equity Tier 1 Risk Based Capital Amount $ 860,924
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 14.64
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 264,600
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 $ 411,600
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 $ 382,200
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 $ 880,924
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 14.98
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 352,800
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 $ 499,800
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 $ 470,400
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00
Tier 1 Capital Amount $ 880,924
Tier 1 Capital To Average Assets Ratio 9.13
Tier 1 Capital Required For Capital Adequacy Amount $ 385,803
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00
Tier 1 Capital Required To Be Well Capitalized Amount $ 482,254
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 $ 76,186
Total Capital To Risk Weighted Assets Actual Ratio 12.61
Capital Required For Capital Adequacy Amount $ 48,317
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00
Capital With Capital Conservation Buffer Amount $ 63,416
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50
Capital Required To Be Well Capitalized Amount $ 60,396
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00
Common Equity Tier 1 Risk Based Capital Amount $ 71,113
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 11.77
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 27,178
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 $ 42,277
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 $ 39,257
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 $ 71,113
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 11.77
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 36,238
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 $ 51,337
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 $ 48,317
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00
Tier 1 Capital Amount $ 71,113
Tier 1 Capital To Average Assets Ratio 7.15
Tier 1 Capital Required For Capital Adequacy Amount $ 39,786
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00
Tier 1 Capital Required To Be Well Capitalized Amount $ 49,733
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio 5.00