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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Parent Company [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital Amount | $ 997,383 | $ 910,561
Total Capital To Risk Weighted Assets Actual Ratio | 15.64 | 14.42
Capital Required For Capital Adequacy Amount | $ 510,110 | $ 505,050
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00 | 8.00
Capital With Capital Conservation Buffer Amount | $ 669,519 | $ 662,878
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 10.50 | 10.50
Common Equity Tier 1 Risk Based Capital Amount | $ 891,534 | $ 830,323
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.98 | 13.15
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 286,937 | $ 284,091
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 4.50 | 4.50
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 446,346 | $ 441,919
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.00 | 7.00
Tier 1 Risk Based Capital Amount | $ 917,534 | $ 856,323
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 14.39 | 13.56
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 382,583 | $ 378,788
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 6.00 | 6.00
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 541,992 | $ 536,616
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 8.50 | 8.50
Tier 1 Capital Amount | $ 917,534 | $ 856,323
Tier 1 Capital To Average Assets Ratio | 9.63 | 10.28
Tier 1 Capital Required For Capital Adequacy Amount | $ 380,952 | $ 333,171
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00 | 4.00
BancFirst [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital Amount | $ 898,714 | $ 827,928
Total Capital To Risk Weighted Assets Actual Ratio | 15.59 | 14.14
Capital Required For Capital Adequacy Amount | $ 461,142 | $ 468,107
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00 | 8.00
Capital With Capital Conservation Buffer Amount | $ 605,248 | $ 614,390
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 10.50 | 10.50
Capital Required To Be Well Capitalized Amount | $ 576,427 | $ 585,134
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 10.00 | 10.00
Common Equity Tier 1 Risk Based Capital Amount | $ 806,478 | $ 753,659
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.99 | 12.88
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 259,392 | $ 263,310
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 4.50 | 4.50
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 403,499 | $ 409,594
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.00 | 7.00
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 374,678 | $ 380,337
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 6.50 | 6.50
Tier 1 Risk Based Capital Amount | $ 826,478 | $ 773,659
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 14.34 | 13.22
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 345,856 | $ 351,080
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 6.00 | 6.00
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 489,963 | $ 497,364
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 8.50 | 8.50
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 461,142 | $ 468,107
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 8.00 | 8.00
Tier 1 Capital Amount | $ 826,478 | $ 773,659
Tier 1 Capital To Average Assets Ratio | 9.48 | 10.22
Tier 1 Capital Required For Capital Adequacy Amount | $ 348,666 | $ 302,845
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00 | 4.00
Tier 1 Capital Required To Be Well Capitalized Amount | $ 435,833 | $ 378,556
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio | 5.00 | 5.00
Pegasus Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital Amount | $ 70,922 | $ 63,817
Total Capital To Risk Weighted Assets Actual Ratio | 11.85 | 14.15
Capital Required For Capital Adequacy Amount | $ 47,893 | $ 36,083
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00 | 8.00
Capital With Capital Conservation Buffer Amount | $ 62,860 | $ 47,359
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 10.50 | 10.50
Capital Required To Be Well Capitalized Amount | $ 59,866 | $ 45,104
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 10.00 | 10.00
Common Equity Tier 1 Risk Based Capital Amount | $ 66,150 | $ 60,214
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 11.05 | 13.35
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 26,940 | $ 20,297
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 4.50 | 4.50
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 41,906 | $ 31,573
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 7.00 | 7.00
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 38,913 | $ 29,317
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 6.50 | 6.50
Tier 1 Risk Based Capital Amount | $ 66,150 | $ 60,214
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 11.05 | 13.35
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 35,920 | $ 27,062
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 6.00 | 6.00
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 50,886 | $ 38,338
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 8.50 | 8.50
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 47,893 | $ 36,083
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 8.00 | 8.00
Tier 1 Capital Amount | $ 66,150 | $ 60,214
Tier 1 Capital To Average Assets Ratio | 8.10 | 8.58
Tier 1 Capital Required For Capital Adequacy Amount | $ 32,682 | $ 28,058
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00 | 4.00
Tier 1 Capital Required To Be Well Capitalized Amount | $ 40,852 | $ 35,072
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio | 5.00 | 5.00

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