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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Parent Company [Member]  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Total Capital Amount $ 911,073
Total Capital To Risk Weighted Assets Actual Ratio 16.32%
Capital Required For Capital Adequacy Amount $ 446,687
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 586,277
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50%
Common Equity Tier 1 Risk Based Capital Amount $ 832,158
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 14.90%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 251,262
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 $ 390,852
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.00%
Tier 1 Risk Based Capital Amount $ 858,158
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 15.37%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 335,016
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 $ 474,605
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 8.50%
Tier 1 Capital Amount $ 858,158
Tier 1 Capital To Average Assets Ratio 11.38%
Tier 1 Capital Required For Capital Adequacy Amount $ 301,620
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 $ 788,443
Total Capital To Risk Weighted Assets Actual Ratio 14.14%
Capital Required For Capital Adequacy Amount $ 445,937
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 585,292
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 10.50%
Capital Required To Be Well Capitalized Amount $ 557,421
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00%
Common Equity Tier 1 Risk Based Capital Amount $ 715,528
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 $ 250,839
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 $ 390,194
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 $ 362,323
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 $ 735,528
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.20%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 334,452
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 $ 473,808
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 $ 445,937
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00%
Tier 1 Capital Amount $ 735,528
Tier 1 Capital To Average Assets Ratio 9.77%
Tier 1 Capital Required For Capital Adequacy Amount $ 301,212
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount $ 376,514
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio 5.00%