Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands	Mar. 31, 2024 USD ($)
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,506,155
Total Capital To Risk Weighted Assets Actual Ratio	0.1719
Capital Required For Capital Adequacy Amount	$ 701,043
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 920,119
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Common Equity Tier 1 Risk Based Capital Amount	$ 1,323,577
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.151
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 394,337
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	$ 613,413
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07
Tier 1 Risk Based Capital Amount	$ 1,349,577
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.154
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 525,782
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	$ 744,858
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085
Tier 1 Capital Amount	$ 1,349,577
Tier 1 Capital To Quarterly Average Assets Ratio	0.1099
Tier 1 Capital Required For Capital Adequacy Amount	$ 491,387
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	$ 1,193,811
Total Capital To Risk Weighted Assets Actual Ratio	0.1594
Capital Required For Capital Adequacy Amount	$ 599,307
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 786,591
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Capital Required To Be Well Capitalized Amount	$ 749,134
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 1,091,417
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1457
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 337,110
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	$ 524,394
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	$ 486,937
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	$ 1,111,417
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1484
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 449,480
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	$ 636,764
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	$ 599,307
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08
Tier 1 Capital Amount	$ 1,111,417
Tier 1 Capital To Quarterly Average Assets Ratio	0.1062
Tier 1 Capital Required For Capital Adequacy Amount	$ 418,449
Tier 1 Capital Required For Capital Adequacy To Quarterly Average Assets Ratio	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 523,062
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	$ 143,914
Total Capital To Risk Weighted Assets Actual Ratio	0.1711
Capital Required For Capital Adequacy Amount	$ 67,275
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 88,299
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Capital Required To Be Well Capitalized Amount	$ 84,094
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 133,391
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1586
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 37,842
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	$ 58,866
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	$ 54,661
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	$ 133,391
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1586
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 50,456
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	$ 71,480
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	$ 67,275
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08
Tier 1 Capital Amount	$ 133,391
Tier 1 Capital To Quarterly Average Assets Ratio	0.1064
Tier 1 Capital Required For Capital Adequacy Amount	$ 50,133
Tier 1 Capital Required For Capital Adequacy To Quarterly Average Assets Ratio	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 62,666
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	$ 52,335
Total Capital To Risk Weighted Assets Actual Ratio	0.121
Capital Required For Capital Adequacy Amount	$ 34,612
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08
Capital With Capital Conservation Buffer Amount	$ 45,428
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105
Capital Required To Be Well Capitalized Amount	$ 43,265
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 48,295
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1116
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 19,469
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	$ 30,285
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	$ 28,122
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	$ 48,295
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1116
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 25,959
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	$ 36,775
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	$ 34,612
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08
Tier 1 Capital Amount	$ 48,295
Tier 1 Capital To Quarterly Average Assets Ratio	0.0849
Tier 1 Capital Required For Capital Adequacy Amount	$ 22,742
Tier 1 Capital Required For Capital Adequacy To Quarterly Average Assets Ratio	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 28,427
Tier 1 Capital Required To Be Well Capitalized To Quarterly Average Assets Ratio	0.05