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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands | Mar. 31, 2016 USD ($)
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Parent Company [Member] |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
Total Capital Amount | $ 673,104
Total Capital To Risk Weighted Assets Actual Ratio | 14.40%
Capital Required For Capital Adequacy Amount | $ 373,849
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00%
Capital With Capital Conservation Buffer Amount | $ 403,056
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 8.625%
Common Equity Tier 1 Risk Based Capital Amount | $ 597,533
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 12.79%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 210,290
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 | $ 239,497
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 5.125%
Tier 1 Risk Based Capital Amount | $ 628,533
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.45%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 280,387
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 | $ 309,594
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 6.625%
Tier 1 Capital Amount | $ 628,533
Tier 1 Capital To Average Assets Ratio | 9.51%
Tier 1 Capital Required For Capital Adequacy Amount | $ 264,328
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 | $ 616,209
Total Capital To Risk Weighted Assets Actual Ratio | 13.20%
Capital Required For Capital Adequacy Amount | $ 373,346
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00%
Capital With Capital Conservation Buffer Amount | $ 402,513
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 8.625%
Capital Required To Be Well Capitalized Amount | $ 466,682
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 10.00%
Common Equity Tier 1 Risk Based Capital Amount | $ 551,638
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 11.82%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 210,007
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 | $ 239,174
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 5.125%
Common Equity Tier 1 Risk Based Capital Required To Be well Capitalized Amount | $ 303,343
Common Equity Tier 1 Risk Based Capital Required To Be well Capitalized Amount | 6.50%
Tier 1 Risk Based Capital Amount | $ 571,638
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 12.25%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 280,009
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 | $ 309,177
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 6.625%
Tier 1 Risk Based Capital Required To Be well Capitalized Amount | $ 373,346
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 8.00%
Tier 1 Capital Amount | $ 571,638
Tier 1 Capital To Average Assets Ratio | 8.68%
Tier 1 Capital Required For Capital Adequacy Amount | $ 263,405
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount | $ 329,256
Tier 1 Capital Required To Be Well Capitalized To Average assets Ratio | 5.00%

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