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Stockholders' Equity - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2022 | Dec. 31, 2020 | Jan. 01, 2023 | Dec. 31, 2021 | Jun. 17, 2021
Stockholders Equity [Line Items] |  |  |  |  |  |
Additional shares to repurchase | 650,000 |  |  |  |  |
Increase to retained earnings for cumulative effect of adopting ASU |  | $ 1,120,292,000 |  |  | $ 977,067,000 |
Subordinated Notes due 2036 [Member] | Private Placement [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 60,000,000
Small Business Administration (SBA), CARES Act, Paycheck Protection Program Lending Facility [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Percentage of risk weight under risk based capital rules |  | 0.00% |  |  |  |
Cumulative Effect Period of Adoption Adjustment [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Increase to retained earnings for cumulative effect of adopting ASU |  |  | $ 2,300,000 |  |  |
Accounting Standards Update [Extensible List] |  |  | ASC 326 [Member] |  |  |
Maximum [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Quantitative limit for trust preferred securities to be included in tier 1 capital |  | $ 15,000,000,000 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Available equity of BancFirst for dividend payments to the company |  |  |  | $ 185,100,000 |  |
Senior Preferred Stock [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Preferred stock, shares issued |  | 0 |  |  | 0 |
Preferred stock, shares outstanding |  | 0 |  |  |  |
Cumulative Preferred Stock [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Preferred stock, shares issued |  | 0 |  |  | 0 |
Preferred stock, shares outstanding |  | 0 |  |  |  |
Dividend payable at redemption, per share |  | $ 5.00 |  |  |  |
Cumulative preferred stock dividend rate |  | 10.00% |  |  |  |

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