Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,467,062	$ 1,298,329
Total Capital To Risk Weighted Assets Actual Ratio	0.169	0.1661
Capital Required For Capital Adequacy Amount	$ 694,520	$ 625,387
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08	0.08
Capital With Capital Conservation Buffer Amount	$ 911,558	$ 820,821
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105	0.105
Common Equity Tier 1 Risk Based Capital Amount	$ 1,284,966	$ 1,120,361
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.148	0.1433
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 390,668	$ 351,780
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.045	0.045
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 607,705	$ 547,214
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07	0.07
Tier 1 Risk Based Capital Amount	$ 1,310,966	$ 1,146,361
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.151	0.1466
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 520,890	$ 469,041
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.06	0.06
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 737,928	$ 664,474
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085	0.085
Tier 1 Capital Amount	$ 1,310,966	$ 1,146,361
Tier 1 Capital To Average Assets Ratio	0.1076	0.093
Tier 1 Capital Required For Capital Adequacy Amount	$ 487,279	$ 493,191
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	0.04	0.04
BancFirst [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,166,750	$ 1,092,098
Total Capital To Risk Weighted Assets Actual Ratio	0.1568	0.1668
Capital Required For Capital Adequacy Amount	$ 595,191	$ 523,932
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08	0.08
Capital With Capital Conservation Buffer Amount	$ 781,189	$ 687,661
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105	0.105
Capital Required To Be Well Capitalized Amount	$ 743,989	$ 654,916
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 1,061,943	$ 991,050
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1427	0.1513
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 334,795	$ 294,712
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.045	0.045
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 520,792	$ 458,441
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07	0.07
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 483,593	$ 425,695
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.065	0.065
Tier 1 Risk Based Capital Amount	$ 1,081,943	$ 1,011,050
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1454	0.1544
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 446,393	$ 392,949
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.06	0.06
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 632,391	$ 556,678
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085	0.085
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 595,191	$ 523,932
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08	0.08
Tier 1 Capital Amount	$ 1,081,943	$ 1,011,050
Tier 1 Capital To Average Assets Ratio	0.1043	0.0972
Tier 1 Capital Required For Capital Adequacy Amount	$ 414,882	$ 416,004
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	0.04	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 518,603	$ 520,005
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	0.05	0.05
Pegasus [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 139,472	$ 117,445
Total Capital To Risk Weighted Assets Actual Ratio	0.1698	0.1291
Capital Required For Capital Adequacy Amount	$ 65,706	$ 77,802
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08	0.08
Capital With Capital Conservation Buffer Amount	$ 86,239	$ 95,553
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105	0.105
Capital Required To Be Well Capitalized Amount	$ 82,132	$ 91,003
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 130,792	$ 108,437
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1592	0.1192
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 36,959	$ 40,951
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.045	0.045
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 57,492	$ 63,702
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07	0.07
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 53,386	$ 59,152
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.065	0.065
Tier 1 Risk Based Capital Amount	$ 130,792	$ 108,437
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1592	0.1192
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 49,279	$ 54,602
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.06	0.06
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 69,812	$ 77,352
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085	0.085
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 65,706	$ 72,802
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08	0.08
Tier 1 Capital Amount	$ 130,792	$ 108,437
Tier 1 Capital To Average Assets Ratio	0.1056	0.08
Tier 1 Capital Required For Capital Adequacy Amount	$ 49,529	$ 54,238
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	0.04	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 61,911	$ 67,798
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	0.05	0.05
Worthington [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 51,608	$ 47,554
Total Capital To Risk Weighted Assets Actual Ratio	0.123	0.1409
Capital Required For Capital Adequacy Amount	$ 33,571	$ 27,006
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.08	0.08
Capital With Capital Conservation Buffer Amount	$ 44,061	$ 35,446
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.105	0.105
Capital Required To Be Well Capitalized Amount	$ 41,963	$ 33,758
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.10	0.10
Common Equity Tier 1 Risk Based Capital Amount	$ 47,690	$ 44,207
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1136	0.131
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 18,883	$ 15,191
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.045	0.045
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 29,374	$ 23,631
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.07	0.07
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 27,276	$ 21,943
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.065	0.065
Tier 1 Risk Based Capital Amount	$ 47,690	$ 44,207
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1136	0.131
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 25,178	$ 20,255
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.06	0.06
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 35,669	$ 28,694
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.085	0.085
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 33,571	$ 27,006
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.08	0.08
Tier 1 Capital Amount	$ 47,690	$ 44,207
Tier 1 Capital To Average Assets Ratio	0.0862	0.0853
Tier 1 Capital Required For Capital Adequacy Amount	$ 22,140	$ 20,738
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	0.04	0.04
Tier 1 Capital Required To Be Well Capitalized Amount	$ 27,675	$ 25,922
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	0.05	0.05