Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands	Jun. 30, 2024 USD ($)
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,548,490
Total Capital To Risk Weighted Assets Actual Ratio	0.1722
Capital Required For Capital Adequacy Amount	$ 719,342
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 944,136
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Common Equity Tier 1 Risk Based Capital Amount	$ 1,363,539
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1516
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 404,630
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.045
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 629,424
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07
Tier 1 Risk Based Capital Amount	$ 1,389,539
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1545
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 539,507
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.06
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 764,301
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085
Tier 1 Capital Amount	$ 1,389,539
Tier 1 Capital To Quarterly Average Assets Ratio	0.111
Tier 1 Capital Required For Capital Adequacy Amount	$ 500,747
Tier 1 Capital Required For Capital Adequacy To Quarterly Average Assets Ratio	0.04
BancFirst [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,224,212
Total Capital To Risk Weighted Assets Actual Ratio	0.1609
Capital Required For Capital Adequacy Amount	$ 608,791
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 799,039
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Capital Required To Be Well Capitalized Amount	$ 760,989
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 1,119,672
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1471
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 342,445
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.045
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 532,693
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 494,643
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.065
Tier 1 Risk Based Capital Amount	$ 1,139,672
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1498
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 456,594
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.06
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 646,841
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 608,791
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08
Tier 1 Capital Amount	$ 1,139,672
Tier 1 Capital To Quarterly Average Assets Ratio	0.1069
Tier 1 Capital Required For Capital Adequacy Amount	$ 426,413
Tier 1 Capital Required For Capital Adequacy To Quarterly Average Assets Ratio	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 533,017
Tier 1 Capital Required To Be Well Capitalized To Quarterly Average Assets Ratio	0.05
Pegasus [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 143,683
Total Capital To Risk Weighted Assets Actual Ratio	0.1585
Capital Required For Capital Adequacy Amount	$ 72,538
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 95,206
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Capital Required To Be Well Capitalized Amount	$ 90,672
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 134,727
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1486
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 40,802
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.045
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 63,470
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 58,937
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.065
Tier 1 Risk Based Capital Amount	$ 134,727
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1486
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 54,403
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.06
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 77,071
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 72,538
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08
Tier 1 Capital Amount	$ 134,727
Tier 1 Capital To Quarterly Average Assets Ratio	0.1059
Tier 1 Capital Required For Capital Adequacy Amount	$ 50,900
Tier 1 Capital Required For Capital Adequacy To Quarterly Average Assets Ratio	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 63,624
Tier 1 Capital Required To Be Well Capitalized To Quarterly Average Assets Ratio	0.05
Worthington [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 53,063
Total Capital To Risk Weighted Assets Actual Ratio	0.1185
Capital Required For Capital Adequacy Amount	$ 35,810
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 47,001
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Capital Required To Be Well Capitalized Amount	$ 44,763
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 48,955
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1094
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 20,143
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.045
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 31,334
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 29,096
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.065
Tier 1 Risk Based Capital Amount	$ 48,955
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1094
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 26,858
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.06
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 38,048
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 35,810
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08
Tier 1 Capital Amount	$ 48,955
Tier 1 Capital To Quarterly Average Assets Ratio	0.0844
Tier 1 Capital Required For Capital Adequacy Amount	$ 23,207
Tier 1 Capital Required For Capital Adequacy To Quarterly Average Assets Ratio	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 29,008
Tier 1 Capital Required To Be Well Capitalized To Quarterly Average Assets Ratio	0.05