Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands	Sep. 30, 2022 USD ($)
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,249,568
Total Capital To Risk Weighted Assets Actual Ratio	16.26
Capital Required For Capital Adequacy Amount	$ 614,730
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00
Capital With Capital Conservation Buffer Amount	$ 806,833
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50
Common Equity Tier 1 Risk Based Capital Amount	$ 1,074,471
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.98
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 345,785
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	$ 537,888
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	7.00
Tier 1 Risk Based Capital Amount	$ 1,100,471
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	14.32
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 461,047
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	$ 653,150
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	8.50
Tier 1 Capital Amount	$ 1,100,471
Tier 1 Capital To Average Assets Ratio	8.85
Tier 1 Capital Required For Capital Adequacy Amount	$ 497,560
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	$ 1,068,974
Total Capital To Risk Weighted Assets Actual Ratio	16.60
Capital Required For Capital Adequacy Amount	$ 515,130
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00
Capital With Capital Conservation Buffer Amount	$ 676,108
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50
Capital Required To Be Well Capitalized Amount	$ 643,912
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00
Common Equity Tier 1 Risk Based Capital Amount	$ 970,166
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	15.07
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 289,760
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	$ 450,738
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	7.00
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 418,543
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.50
Tier 1 Risk Based Capital Amount	$ 990,166
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	15.38
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 386,347
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	$ 547,325
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	8.50
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 515,130
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	8.00
Tier 1 Capital Amount	$ 990,166
Tier 1 Capital To Average Assets Ratio	9.46
Tier 1 Capital Required For Capital Adequacy Amount	$ 418,890
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4.00
Tier 1 Capital Required To Be Well Capitalized Amount	$ 523,612
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	5.00
Pegasus [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 109,228
Total Capital To Risk Weighted Assets Actual Ratio	11.89
Capital Required For Capital Adequacy Amount	$ 73,513
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00
Capital With Capital Conservation Buffer Amount	$ 96,486
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50
Capital Required To Be Well Capitalized Amount	$ 91,892
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00
Common Equity Tier 1 Risk Based Capital Amount	$ 101,155
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	11.01
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 41,351
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	$ 64,324
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	7.00
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 59,730
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.50
Tier 1 Risk Based Capital Amount	$ 101,155
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	11.01
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 55,135
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	$ 78,108
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	8.50
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 73,513
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	8.00
Tier 1 Capital Amount	$ 101,155
Tier 1 Capital To Average Assets Ratio	7.05
Tier 1 Capital Required For Capital Adequacy Amount	$ 57,428
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4.00
Tier 1 Capital Required To Be Well Capitalized Amount	$ 71,785
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	5.00
Worthington [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 45,947
Total Capital To Risk Weighted Assets Actual Ratio	14.74
Capital Required For Capital Adequacy Amount	$ 24,930
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00
Capital With Capital Conservation Buffer Amount	$ 32,720
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50
Capital Required To Be Well Capitalized Amount	$ 31,162
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00
Common Equity Tier 1 Risk Based Capital Amount	$ 42,242
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.56
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 14,023
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	$ 21,813
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	7.00
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 20,255
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	6.50
Tier 1 Risk Based Capital Amount	$ 42,242
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.56
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 18,697
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	$ 26,488
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	8.50
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 24,930
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	8.00
Tier 1 Capital Amount	$ 42,242
Tier 1 Capital To Average Assets Ratio	8.02
Tier 1 Capital Required For Capital Adequacy Amount	$ 21,077
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4.00
Tier 1 Capital Required To Be Well Capitalized Amount	$ 26,346
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	5.00