Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands	Mar. 31, 2023 USD ($)
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,346,652
Total Capital To Risk Weighted Assets Actual Ratio	0.1670
Capital Required For Capital Adequacy Amount	$ 645,076
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.0800
Capital With Capital Conservation Buffer Amount	$ 846,662
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.1050
Common Equity Tier 1 Risk Based Capital Amount	$ 1,166,638
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1447
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 362,855
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.0450
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 564,441
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.0700
Tier 1 Risk Based Capital Amount	$ 1,192,638
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1479
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 483,807
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.0600
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 685,393
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.0850
Tier 1 Capital Amount	$ 1,192,638
Tier 1 Capital To Average Assets Ratio	0.0978
Tier 1 Capital Required For Capital Adequacy Amount	$ 487,729
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	0.0400
BancFirst [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,125,839
Total Capital To Risk Weighted Assets Actual Ratio	0.1662
Capital Required For Capital Adequacy Amount	$ 541,939
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.0800
Capital With Capital Conservation Buffer Amount	$ 711,294
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.1050
Capital Required To Be Well Capitalized Amount	$ 677,423
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.1000
Common Equity Tier 1 Risk Based Capital Amount	$ 1,023,399
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1511
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 304,840
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.0450
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 474,196
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.0700
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 440,325
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.0650
Tier 1 Risk Based Capital Amount	$ 1,043,399
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1540
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 406,454
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.0600
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 575,810
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.0850
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 541,939
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.0800
Tier 1 Capital Amount	$ 1,043,399
Tier 1 Capital To Average Assets Ratio	0.1011
Tier 1 Capital Required For Capital Adequacy Amount	$ 412,824
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	0.0400
Tier 1 Capital Required To Be Well Capitalized Amount	$ 516,030
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	0.0500
Pegasus [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 131,647
Total Capital To Risk Weighted Assets Actual Ratio	0.1455
Capital Required For Capital Adequacy Amount	$ 72,377
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.0800
Capital With Capital Conservation Buffer Amount	$ 94,995
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.1050
Capital Required To Be Well Capitalized Amount	$ 90,472
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.1000
Common Equity Tier 1 Risk Based Capital Amount	$ 122,244
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1351
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 40,712
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.0450
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 63,330
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.0700
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 58,807
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.0650
Tier 1 Risk Based Capital Amount	$ 122,244
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1351
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 54,283
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.0600
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 76,901
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.0850
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 72,377
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.0800
Tier 1 Capital Amount	$ 122,244
Tier 1 Capital To Average Assets Ratio	0.0907
Tier 1 Capital Required For Capital Adequacy Amount	$ 53,935
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	0.0400
Tier 1 Capital Required To Be Well Capitalized Amount	$ 67,419
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	0.0500
Worthington [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 49,123
Total Capital To Risk Weighted Assets Actual Ratio	0.1318
Capital Required For Capital Adequacy Amount	$ 29,812
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	0.0800
Capital With Capital Conservation Buffer Amount	$ 39,129
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	0.1050
Capital Required To Be Well Capitalized Amount	$ 37,265
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.1000
Common Equity Tier 1 Risk Based Capital Amount	$ 45,556
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1222
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 16,769
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.0450
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 26,086
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.0700
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 24,222
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.0650
Tier 1 Risk Based Capital Amount	$ 45,556
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	0.1222
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 22,359
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio	0.0600
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount	$ 31,675
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	0.0850
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount	$ 29,812
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	0.0800
Tier 1 Capital Amount	$ 45,556
Tier 1 Capital To Average Assets Ratio	0.0908
Tier 1 Capital Required For Capital Adequacy Amount	$ 20,062
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	0.0400
Tier 1 Capital Required To Be Well Capitalized Amount	$ 25,077
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	0.0500