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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail)
$ in Thousands
Jun. 30, 2017
USD ($)
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%