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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Jan. 31, 2024 | Dec. 31, 2022 | Jun. 17, 2021
Stockholders Equity [Line Items] |  |  |  |
Increase to retained earnings for cumulative effect of adopting ASU | $ 1,276,305 |  | $ 1,120,292 |
Subordinated Notes due 2036 [Member] | Private Placement [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Aggregate principal amount |  |  |  | $ 60,000
Maximum [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Quantitative limit for trust preferred securities to be included in tier 1 capital | $ 15,000,000 |  |  |
Subsequent Event [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Available equity of BancFirst for dividend payments to the company |  | $ 145,700 |  |
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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