Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands	Mar. 31, 2022 USD ($)
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,167,735
Total Capital To Risk Weighted Assets Actual Ratio	15.99
Capital Required For Capital Adequacy Amount	$ 584,236
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00
Capital With Capital Conservation Buffer Amount	$ 766,810
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50
Common Equity Tier 1 Risk Based Capital Amount	$ 995,299
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.63
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 328,633
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	$ 511,207
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	7.00
Tier 1 Risk Based Capital Amount	$ 1,021,299
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.98
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 438,177
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	$ 620,751
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	8.50
Tier 1 Capital Amount	$ 1,021,299
Tier 1 Capital To Average Assets Ratio	8.66
Tier 1 Capital Required For Capital Adequacy Amount	$ 471,735
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	$ 1,010,124
Total Capital To Risk Weighted Assets Actual Ratio	16.25
Capital Required For Capital Adequacy Amount	$ 497,404
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00
Capital With Capital Conservation Buffer Amount	$ 652,843
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50
Capital Required To Be Well Capitalized Amount	$ 621,755
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00
Common Equity Tier 1 Risk Based Capital Amount	$ 912,401
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	14.67
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 279,790
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	$ 435,229
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	$ 404,141
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	$ 932,401
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	15.00
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 373,053
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	$ 528,492
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	$ 497,404
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	8.00
Tier 1 Capital Amount	$ 932,401
Tier 1 Capital To Average Assets Ratio	9.08
Tier 1 Capital Required For Capital Adequacy Amount	$ 410,756
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4.00
Tier 1 Capital Required To Be Well Capitalized Amount	$ 513,445
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	$ 95,969
Total Capital To Risk Weighted Assets Actual Ratio	11.83
Capital Required For Capital Adequacy Amount	$ 64,878
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00
Capital With Capital Conservation Buffer Amount	$ 85,153
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50
Capital Required To Be Well Capitalized Amount	$ 81,098
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00
Common Equity Tier 1 Risk Based Capital Amount	$ 89,376
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	11.02
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 36,494
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	$ 56,768
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	$ 52,714
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	$ 89,376
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	11.02
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 48,659
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	$ 68,933
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	$ 64,878
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	8.00
Tier 1 Capital Amount	$ 89,376
Tier 1 Capital To Average Assets Ratio	6.81
Tier 1 Capital Required For Capital Adequacy Amount	$ 52,515
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4.00
Tier 1 Capital Required To Be Well Capitalized Amount	$ 65,644
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	$ 39,569
Total Capital To Risk Weighted Assets Actual Ratio	15.45
Capital Required For Capital Adequacy Amount	$ 20,490
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00
Capital With Capital Conservation Buffer Amount	$ 26,893
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50
Capital Required To Be Well Capitalized Amount	$ 25,613
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00
Common Equity Tier 1 Risk Based Capital Amount	$ 36,365
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	14.20
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 11,526
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	$ 17,929
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	$ 16,648
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	$ 36,365
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	14.20
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 15,368
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	$ 21,771
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	$ 20,490
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	8.00
Tier 1 Capital Amount	$ 36,365
Tier 1 Capital To Average Assets Ratio	7.65
Tier 1 Capital Required For Capital Adequacy Amount	$ 19,019
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4.00
Tier 1 Capital Required To Be Well Capitalized Amount	$ 23,774
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	5.00