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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands | Jun. 30, 2017 USD ($)
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Parent Company [Member] |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
Total Capital Amount | $ 763,741
Total Capital To Risk Weighted Assets Actual Ratio | 15.51%
Capital Required For Capital Adequacy Amount | $ 394,051
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00%
Capital With Capital Conservation Buffer Amount | $ 455,621
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 9.25%
Common Equity Tier 1 Risk Based Capital Amount | $ 683,736
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.88%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 221,653
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 | $ 283,224
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 5.75%
Tier 1 Risk Based Capital Amount | $ 714,736
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 14.51%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 295,538
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 | $ 357,108
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.25%
Tier 1 Capital Amount | $ 714,736
Tier 1 Capital To Average Assets Ratio | 10.15%
Tier 1 Capital Required For Capital Adequacy Amount | $ 281,701
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 | $ 685,395
Total Capital To Risk Weighted Assets Actual Ratio | 13.93%
Capital Required For Capital Adequacy Amount | $ 393,644
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00%
Capital With Capital Conservation Buffer Amount | $ 455,151
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 9.25%
Capital Required To Be Well Capitalized Amount | $ 492,055
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 10.00%
Common Equity Tier 1 Risk Based Capital Amount | $ 616,390
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 12.53%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 221,425
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 | $ 282,932
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 5.75%
Common Equity Tier 1 Risk Based Capital Required To Be well Capitalized Amount | $ 319,836
Common Equity Tier 1 Risk Based Capital Required To Be well Capitalized Amount | 6.50%
Tier 1 Risk Based Capital Amount | $ 636,390
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 12.93%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 295,233
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 | $ 356,740
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.25%
Tier 1 Risk Based Capital Required To Be well Capitalized Amount | $ 393,644
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 8.00%
Tier 1 Capital Amount | $ 636,390
Tier 1 Capital To Average Assets Ratio | 9.05%
Tier 1 Capital Required For Capital Adequacy Amount | $ 281,404
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount | $ 351,755
Tier 1 Capital Required To Be Well Capitalized To Average assets Ratio | 5.00%

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