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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Parent Company [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital Amount | $ 797,015 | $ 728,635
Total Capital To Risk Weighted Assets Actual Ratio | 15.62% | 15.33%
Capital Required For Capital Adequacy Amount | $ 408,234 | $ 380,351
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00% | 8.00%
Capital With Capital Conservation Buffer Amount | $ 472,020 | $ 410,066
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 9.25% | 8.625%
Common Equity Tier 1 Risk Based Capital Amount | $ 714,349 | $ 648,942
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 14.00% | 13.65%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 229,632 | $ 213,947
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 4.50% | 4.50%
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 293,418 | $ 243,662
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 5.75% | 5.125%
Tier 1 Risk Based Capital Amount | $ 745,349 | $ 679,942
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 14.61% | 14.30%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 306,175 | $ 285,263
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 6.00% | 6.00%
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 369,962 | $ 314,978
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.25% | 6.625%
Tier 1 Capital Amount | $ 745,349 | $ 679,942
Tier 1 Capital To Average Assets Ratio | 10.44% | 9.94%
Tier 1 Capital Required For Capital Adequacy Amount | $ 285,444 | $ 273,510
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00% | 4.00%
BancFirst [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital Amount | $ 714,964 | $ 655,620
Total Capital To Risk Weighted Assets Actual Ratio | 14.03% | 13.80%
Capital Required For Capital Adequacy Amount | $ 407,698 | $ 379,948
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00% | 8.00%
Capital With Capital Conservation Buffer Amount | $ 471,401 | $ 409,631
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 9.25% | 8.625%
Capital Required To Be Well Capitalized Amount | $ 509,622 | $ 474,934
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 10.00% | 10.00%
Common Equity Tier 1 Risk Based Capital Amount | $ 643,298 | $ 586,927
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 12.62% | 12.36%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 229,330 | $ 213,720
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 4.50% | 4.50%
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 293,033 | $ 243,404
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 5.75% | 5.125%
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 331,255 | $ 308,707
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 6.50% | 6.50%
Tier 1 Risk Based Capital Amount | $ 663,298 | $ 606,927
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.02% | 12.78%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 306,773 | $ 284,961
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 6.00% | 6.00%
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 369,476 | $ 314,644
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.25% | 6.625%
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 407,698 | $ 379,948
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 8.00% | 8.00%
Tier 1 Capital Amount | $ 663,298 | $ 606,927
Tier 1 Capital To Average Assets Ratio | 9.31% | 8.89%
Tier 1 Capital Required For Capital Adequacy Amount | $ 285,101 | $ 273,152
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00% | 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount | $ 356,677 | $ 341,440
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio | 5.00% | 5.00%

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