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Acquisitions - Narrative (Details) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 08, 2022 USD ($) shares | Nov. 20, 2021 USD ($) | Oct. 08, 2021 USD ($) branch shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Nov. 19, 2021 USD ($) branch
Spirit of Texas Bancshares, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Shares issued (in shares) | shares | 18,275,074 |  |  |  |  |  |
Stock issued for acquisition | $ 464,900,000 |  |  |  | $ 464,918,000 |  |
Payments to acquire businesses, gross | $ 1,393,508.9 |  |  |  |  |  |
Number of bank branches acquired | branch |  |  |  |  |  |  | 35
Assets acquired, after acquisition method adjustments |  |  |  |  |  |  | $ 3,110,000,000
Loans acquired, after acquisition method adjustments |  |  |  |  | 35,200,000 |  | 2,290,000,000
Customer deposits acquired, after acquisition method adjustments |  |  |  |  |  |  | $ 2,720,000,000
Goodwill |  | $ 174,146,000 |  |  |  |  |
Acquisition-related costs |  |  |  |  | 18,700,000 |  |
Landmark Community Bank |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  | 4,499,872 |  |  |  |
Stock issued for acquisition |  |  | $ 138,200,000 |  |  |  |
Payments to acquire businesses, gross |  |  | $ 6,451,727.43 |  |  |  |
Number of bank branches acquired | branch |  |  | 8 |  |  |  |
Assets acquired, after acquisition method adjustments |  |  | $ 968,800,000 |  |  |  |
Loans acquired, after acquisition method adjustments |  |  | 789,500,000 |  |  |  |
Customer deposits acquired, after acquisition method adjustments |  |  | 802,700,000 |  |  |  |
Goodwill |  |  | $ 31,404,000 |  |  |  |
Triumph Bancshares, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  | 4,164,712 |  |  |  |
Stock issued for acquisition |  |  | $ 127,900,000 |  |  |  |
Payments to acquire businesses, gross |  |  | $ 1,693,402.93 |  |  |  |
Number of bank branches acquired | branch |  |  | 6 |  |  |  |
Assets acquired, after acquisition method adjustments |  |  | $ 847,200,000 |  |  |  |
Loans acquired, after acquisition method adjustments |  |  | 698,800,000 |  |  |  |
Customer deposits acquired, after acquisition method adjustments |  |  | 719,700,000 |  |  |  |
Goodwill |  |  | $ 39,944,000 |  |  |  |
Acquisition-related costs |  |  |  | $ 1,400,000 | $ 22,500,000 | $ 15,900,000 |

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