Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands	Jun. 30, 2022 USD ($)
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital Amount	$ 1,198,933
Total Capital To Risk Weighted Assets Actual Ratio	16.02
Capital Required For Capital Adequacy Amount	$ 599,086
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00
Capital With Capital Conservation Buffer Amount	$ 786,300
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50
Common Equity Tier 1 Risk Based Capital Amount	$ 1,026,801
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.72
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 336,986
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	$ 524,200
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	7.00
Tier 1 Risk Based Capital Amount	$ 1,052,801
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	14.07
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 449,314
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	$ 636,529
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio	8.50
Tier 1 Capital Amount	$ 1,052,801
Tier 1 Capital To Average Assets Ratio	8.47
Tier 1 Capital Required For Capital Adequacy Amount	$ 497,366
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	$ 1,036,057
Total Capital To Risk Weighted Assets Actual Ratio	16.41
Capital Required For Capital Adequacy Amount	$ 504,967
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00
Capital With Capital Conservation Buffer Amount	$ 662,769
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50
Capital Required To Be Well Capitalized Amount	$ 631,209
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00
Common Equity Tier 1 Risk Based Capital Amount	$ 939,308
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	14.88
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 284,044
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	$ 441,846
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	$ 410,286
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	$ 959,308
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	15.20
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 378,725
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	$ 536,527
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	$ 504,967
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	8.00
Tier 1 Capital Amount	$ 959,308
Tier 1 Capital To Average Assets Ratio	9.10
Tier 1 Capital Required For Capital Adequacy Amount	$ 421,682
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4.00
Tier 1 Capital Required To Be Well Capitalized Amount	$ 527,102
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	$ 101,936
Total Capital To Risk Weighted Assets Actual Ratio	11.68
Capital Required For Capital Adequacy Amount	$ 69,794
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00
Capital With Capital Conservation Buffer Amount	$ 91,605
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50
Capital Required To Be Well Capitalized Amount	$ 87,243
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00
Common Equity Tier 1 Risk Based Capital Amount	$ 94,663
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	10.85
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 39,259
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	$ 61,070
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	$ 56,708
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	$ 94,663
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	10.85
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 52,346
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	$ 74,157
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	$ 69,794
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	8.00
Tier 1 Capital Amount	$ 94,663
Tier 1 Capital To Average Assets Ratio	7.04
Tier 1 Capital Required For Capital Adequacy Amount	$ 53,773
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4.00
Tier 1 Capital Required To Be Well Capitalized Amount	$ 67,216
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	$ 43,784
Total Capital To Risk Weighted Assets Actual Ratio	15.14
Capital Required For Capital Adequacy Amount	$ 23,138
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio	8.00
Capital With Capital Conservation Buffer Amount	$ 30,369
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio	10.50
Capital Required To Be Well Capitalized Amount	$ 28,923
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	10.00
Common Equity Tier 1 Risk Based Capital Amount	$ 40,248
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.92
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 13,015
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	$ 20,246
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	$ 18,800
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	$ 40,248
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio	13.92
Tier 1 Risk Based Capital Required For Capital Adequacy Amount	$ 17,354
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	$ 24,584
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	$ 23,138
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio	8.00
Tier 1 Capital Amount	$ 40,248
Tier 1 Capital To Average Assets Ratio	8.00
Tier 1 Capital Required For Capital Adequacy Amount	$ 20,129
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio	4.00
Tier 1 Capital Required To Be Well Capitalized Amount	$ 25,162
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio	5.00