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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands | Jun. 30, 2018 USD ($)
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Parent Company [Member] |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
Total Capital Amount | $ 851,222
Total Capital To Risk Weighted Assets Actual Ratio | 15.80%
Capital Required For Capital Adequacy Amount | $ 430,907
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00%
Capital With Capital Conservation Buffer Amount | $ 424,174
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 9.875%
Common Equity Tier 1 Risk Based Capital Amount | $ 768,022
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 14.26%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 242,385
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 | $ 343,379
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 6.375%
Tier 1 Risk Based Capital Amount | $ 799,022
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 14.83%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 323,180
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 | $ 531,901
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.875%
Tier 1 Capital Amount | $ 799,022
Tier 1 Capital To Average Assets Ratio | 10.67%
Tier 1 Capital Required For Capital Adequacy Amount | $ 299,443
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 | $ 731,628
Total Capital To Risk Weighted Assets Actual Ratio | 13.75%
Capital Required For Capital Adequacy Amount | $ 425,551
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00%
Capital With Capital Conservation Buffer Amount | $ 525,290
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 9.875%
Capital Required To Be Well Capitalized Amount | $ 531,939
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 10.00%
Common Equity Tier 1 Risk Based Capital Amount | $ 659,428
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 12.40%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 239,373
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 | $ 339,111
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 | $ 345,760
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 | $ 679,428
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 12.77%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 319,163
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 | $ 418,902
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 | $ 425,551
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 8.00%
Tier 1 Capital Amount | $ 679,428
Tier 1 Capital To Average Assets Ratio | 9.18%
Tier 1 Capital Required For Capital Adequacy Amount | $ 295,894
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount | $ 369,868
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio | 5.00%

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