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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Parent Company [Member]  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Total Capital Amount $ 875,460
Total Capital To Risk Weighted Assets Actual Ratio 16.39%
Capital Required For Capital Adequacy Amount $ 427,430
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 527,609
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 9.875%
Common Equity Tier 1 Risk Based Capital Amount $ 792,585
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 14.83%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 240,430
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 $ 340,609
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 6.375%
Tier 1 Risk Based Capital Amount $ 823,585
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 15.41%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 320,573
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 $ 420,752
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.875%
Tier 1 Capital Amount $ 823,585
Tier 1 Capital To Average Assets Ratio 10.93%
Tier 1 Capital Required For Capital Adequacy Amount $ 301,392
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 $ 745,152
Total Capital To Risk Weighted Assets Actual Ratio 13.96%
Capital Required For Capital Adequacy Amount $ 426,871
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 526,919
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 9.875%
Capital Required To Be Well Capitalized Amount $ 533,589
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00%
Common Equity Tier 1 Risk Based Capital Amount $ 673,277
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.62%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 240,115
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 $ 340,163
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 6.375%
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 346,833
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 $ 693,277
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.99%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 320,153
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 $ 420,202
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.875%
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount $ 426,871
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00%
Tier 1 Capital Amount $ 693,277
Tier 1 Capital To Average Assets Ratio 9.21%
Tier 1 Capital Required For Capital Adequacy Amount $ 301,193
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount $ 376,491
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio 5.00%