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Stockholders' Equity - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Jan. 01, 2020 | Dec. 31, 2018
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 |  | $ 140,100,000 |
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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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21488-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21564-112644 + Details
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