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v3.20.4

Stockholders' Equity - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Jan. 01, 2021 | Dec. 31, 2019
Stockholders Equity [Line Items] |  |  |
Increase to retained earnings for cumulative effect of adopting ASU | $ 871,161,000 |  | $ 815,488,000
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] | us-gaap:AccountingStandardsUpdate201613Member |  |
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 |  | $ 102,100,000 |
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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