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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands | Mar. 31, 2017 USD ($)
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Parent Company [Member] |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
Total Capital Amount | $ 743,955
Total Capital To Risk Weighted Assets Actual Ratio | 15.72%
Capital Required For Capital Adequacy Amount | $ 378,690
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00%
Capital With Capital Conservation Buffer Amount | $ 437,861
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 9.25%
Common Equity Tier 1 Risk Based Capital Amount | $ 665,034
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 14.05%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 213,013
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 | $ 272,184
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 5.75%
Tier 1 Risk Based Capital Amount | $ 696,034
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 14.70%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 284,018
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 | $ 343,188
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.25%
Tier 1 Capital Amount | $ 696,034
Tier 1 Capital To Average Assets Ratio | 9.95%
Tier 1 Capital Required For Capital Adequacy Amount | $ 279,674
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 | $ 668,329
Total Capital To Risk Weighted Assets Actual Ratio | 14.14%
Capital Required For Capital Adequacy Amount | $ 378,252
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00%
Capital With Capital Conservation Buffer Amount | $ 437,354
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 9.25%
Capital Required To Be Well Capitalized Amount | $ 472,815
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 10.00%
Common Equity Tier 1 Risk Based Capital Amount | $ 600,408
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 12.70%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 212,767
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 | $ 271,869
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 | $ 307,330
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 | $ 620,408
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.12%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 283,689
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 | $ 342,791
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 | $ 378,252
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 8.00%
Tier 1 Capital Amount | $ 620,408
Tier 1 Capital To Average Assets Ratio | 8.88%
Tier 1 Capital Required For Capital Adequacy Amount | $ 279,412
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount | $ 349,266
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio | 5.00%

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