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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands | Jun. 30, 2019 USD ($)
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Parent Company [Member] |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
Total Capital Amount | $ 939,223
Total Capital To Risk Weighted Assets Actual Ratio | 16.71%
Capital Required For Capital Adequacy Amount | $ 449,674
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00%
Capital With Capital Conservation Buffer Amount | $ 590,197
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 10.50%
Common Equity Tier 1 Risk Based Capital Amount | $ 858,115
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 15.27%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 252,942
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 | $ 393,465
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.00%
Tier 1 Risk Based Capital Amount | $ 884,115
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 15.73%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 337,256
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 | $ 477,779
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 8.50%
Tier 1 Capital Amount | $ 884,115
Tier 1 Capital To Average Assets Ratio | 11.64%
Tier 1 Capital Required For Capital Adequacy Amount | $ 303,864
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 | $ 813,627
Total Capital To Risk Weighted Assets Actual Ratio | 14.50%
Capital Required For Capital Adequacy Amount | $ 448,824
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00%
Capital With Capital Conservation Buffer Amount | $ 589,082
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 10.50%
Capital Required To Be Well Capitalized Amount | $ 561,030
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 10.00%
Common Equity Tier 1 Risk Based Capital Amount | $ 738,519
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.16%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 252,464
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 | $ 392,721
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 | $ 364,670
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 | $ 758,519
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.52%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 336,618
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 | $ 476,876
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 | $ 448,824
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 8.00%
Tier 1 Capital Amount | $ 758,519
Tier 1 Capital To Average Assets Ratio | 10.01%
Tier 1 Capital Required For Capital Adequacy Amount | $ 303,252
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount | $ 379,065
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio | 5.00%

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