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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail)
$ in Thousands
Mar. 31, 2020
USD ($)
Parent Company [Member]  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Total Capital Amount $ 937,808
Total Capital To Risk Weighted Assets Actual Ratio 14.30%
Capital Required For Capital Adequacy Amount $ 524,592
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 688,527
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50%
Common Equity Tier 1 Risk Based Capital Amount $ 841,728
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.84%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 295,083
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 $ 459,018
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.00%
Tier 1 Risk Based Capital Amount $ 867,728
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.23%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 393,444
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 $ 557,379
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 8.50%
Tier 1 Capital Amount $ 867,728
Tier 1 Capital To Average Assets Ratio 10.41%
Tier 1 Capital Required For Capital Adequacy Amount $ 333,372
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 $ 853,975
Total Capital To Risk Weighted Assets Actual Ratio 14.10%
Capital Required For Capital Adequacy Amount $ 484,515
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 635,926
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50%
Capital Required To Be Well Capitalized Amount $ 605,644
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00%
Common Equity Tier 1 Risk Based Capital Amount $ 767,058
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.67%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 272,540
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 $ 423,951
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 $ 393,669
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 $ 787,058
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.00%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 363,387
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 $ 514,798
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 $ 484,515
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00%
Tier 1 Capital Amount $ 787,058
Tier 1 Capital To Average Assets Ratio 10.35%
Tier 1 Capital Required For Capital Adequacy Amount $ 304,312
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount $ 380,390
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 $ 65,152
Total Capital To Risk Weighted Assets Actual Ratio 13.31%
Capital Required For Capital Adequacy Amount $ 39,146
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 51,379
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50%
Capital Required To Be Well Capitalized Amount $ 48,932
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00%
Common Equity Tier 1 Risk Based Capital Amount $ 61,537
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.58%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 22,019
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 $ 34,252
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 $ 31,806
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 $ 61,537
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.58%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 29,359
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 $ 41,592
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 $ 39,146
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00%
Tier 1 Capital Amount $ 61,537
Tier 1 Capital To Average Assets Ratio 8.83%
Tier 1 Capital Required For Capital Adequacy Amount $ 27,880
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount $ 34,850
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio 5.00%