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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Parent Company [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital Amount $ 910,561 $ 886,190
Total Capital To Risk Weighted Assets Actual Ratio 14.42% 16.29%
Capital Required For Capital Adequacy Amount $ 505,050 $ 435,208
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00% 8.00%
Capital With Capital Conservation Buffer Amount $ 662,878 $ 537,210
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50% 9.875%
Common Equity Tier 1 Risk Based Capital Amount $ 830,323 $ 808,801
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.15% 14.87%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 284,091 $ 244,804
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 $ 441,919 $ 346,806
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.00% 6.375%
Tier 1 Risk Based Capital Amount $ 856,323 $ 834,801
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.56% 15.35%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 378,788 $ 326,406
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 $ 536,616 $ 428,408
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 8.50% 7.875%
Tier 1 Capital Amount $ 856,323 $ 834,801
Tier 1 Capital To Average Assets Ratio 10.28% 11.09%
Tier 1 Capital Required For Capital Adequacy Amount $ 333,171 $ 301,116
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 $ 827,928 $ 765,487
Total Capital To Risk Weighted Assets Actual Ratio 14.14% 14.09%
Capital Required For Capital Adequacy Amount $ 468,107 $ 434,573
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00% 8.00%
Capital With Capital Conservation Buffer Amount $ 614,390 $ 536,426
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50% 9.875%
Capital Required To Be Well Capitalized Amount $ 585,134 $ 543,216
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00% 10.00%
Common Equity Tier 1 Risk Based Capital Amount $ 753,659 $ 694,098
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.88% 12.78%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 263,310 $ 244,447
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 $ 409,594 $ 346,300
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.00% 6.375%
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 380,337 $ 353,090
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 $ 773,659 $ 714,098
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.22% 13.15%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 351,080 $ 325,930
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 $ 497,364 $ 427,783
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 8.50% 7.875%
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 468,107 $ 434,573
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00% 8.00%
Tier 1 Capital Amount $ 773,659 $ 714,098
Tier 1 Capital To Average Assets Ratio 10.22% 9.49%
Tier 1 Capital Required For Capital Adequacy Amount $ 302,845 $ 300,855
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00% 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount $ 378,556 $ 376,069
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio 5.00% 5.00%
Pegasus Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital Amount $ 63,817  
Total Capital To Risk Weighted Assets Actual Ratio 14.15%  
Capital Required For Capital Adequacy Amount $ 36,083  
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%  
Capital With Capital Conservation Buffer Amount $ 47,359  
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50%  
Capital Required To Be Well Capitalized Amount $ 45,104  
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00%  
Common Equity Tier 1 Risk Based Capital Amount $ 60,214  
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.35%  
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 20,297  
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 $ 31,573  
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 $ 29,317  
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 $ 60,214  
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.35%  
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 27,062  
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 $ 38,338  
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 $ 36,083  
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00%  
Tier 1 Capital Amount $ 60,214  
Tier 1 Capital To Average Assets Ratio 8.58%  
Tier 1 Capital Required For Capital Adequacy Amount $ 28,058  
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00%  
Tier 1 Capital Required To Be Well Capitalized Amount $ 35,072  
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio 5.00%