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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail)
$ in Thousands
Mar. 31, 2016
USD ($)
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%