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Recent Developments Including Mergers and Acquisitions - Additional Information (Detail) | Jul. 20, 2023 USD ($) | Feb. 08, 2022 USD ($) Location | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | --- | --- | --- | ---
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |
Total assets |  |  | $ 12,372,042,000 | $ 12,387,863,000 | $ 9,405,612,000
Loans held for investment (net of unearned interest) |  |  | 7,656,645,000 | 6,943,563,000 |
Deposits |  |  | 10,700,122,000 | 10,974,228,000 |
Goodwill |  |  | $ 182,263,000 | $ 182,055,000 | $ 149,922,000
RCB Bank [Member] |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |
Total assets | $ 2,500,000 |  |  |  |
Loans held for investment (net of unearned interest) | 2,100,000 |  |  |  |
Deposits | 10,800,000 |  |  |  |
Proceeds from acquisition | 7,800,000 |  |  |  |
Intangibles assets, net | 252,000 |  |  |  |
Goodwill | $ 209,000 |  |  |  |
Worthington [Member] |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |
Purchase price |  | $ 77,700,000 |  |  |
Total assets |  | 478,000,000 |  |  |
Loans held for investment (net of unearned interest) |  | 257,000,000 |  |  |
Deposits |  | 430,000,000 |  |  |
Intangibles assets, net |  | 5,900,000 |  |  |
Goodwill |  | $ 32,100,000 |  |  |
Worthington [Member] | Arlington, Texas [Member] |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |
Number of banking locations | Location |  | 1 |  |  |
Worthington [Member] | Colleyville, Texas [Member] |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |
Number of banking locations | Location |  | 1 |  |  |
Worthington [Member] | Fort Worth, Texas [Member] |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |
Number of banking locations | Location |  | 2 |  |  |

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