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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail)
$ in Thousands
Sep. 30, 2017
USD ($)
Parent Company [Member]  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Total Capital Amount $ 782,662
Total Capital To Risk Weighted Assets Actual Ratio 15.58%
Capital Required For Capital Adequacy Amount $ 401,869
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 464,661
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 9.25%
Common Equity Tier 1 Risk Based Capital Amount $ 700,407
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 13.94%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 226,051
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 $ 288,843
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 5.75%
Tier 1 Risk Based Capital Amount $ 731,407
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 14.56%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 301,402
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 $ 364,194
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio 7.25%
Tier 1 Capital Amount $ 731,407
Tier 1 Capital To Average Assets Ratio 10.44%
Tier 1 Capital Required For Capital Adequacy Amount $ 280,325
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 $ 702,516
Total Capital To Risk Weighted Assets Actual Ratio 14.00%
Capital Required For Capital Adequacy Amount $ 401,415
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio 8.00%
Capital With Capital Conservation Buffer Amount $ 464,137
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio 9.25%
Capital Required To Be Well Capitalized Amount $ 501,769
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 10.00%
Common Equity Tier 1 Risk Based Capital Amount $ 631,261
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.58%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 225,796
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 $ 288,517
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 $ 326,150
Common Equity Tier 1 Risk Based Capital Required To Be well Capitalized Amount 6.50%
Tier 1 Risk Based Capital Amount $ 651,261
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio 12.98%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount $ 301,062
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 $ 363,783
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 $ 401,415
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio 8.00%
Tier 1 Capital Amount $ 651,261
Tier 1 Capital To Average Assets Ratio 9.31%
Tier 1 Capital Required For Capital Adequacy Amount $ 279,919
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount $ 349,899
Tier 1 Capital Required To Be Well Capitalized To Average assets Ratio 5.00%