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Acquisitions - Narrative (Details) - Spirit of Texas Bancshares, Inc. |  |  | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 08, 2022 USD ($) shares | Nov. 20, 2021 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2023 USD ($) | Nov. 19, 2021 USD ($) branch | Nov. 18, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Shares issued (in shares) | shares | 18,275,074 |  |  |  |  |  |
Payments to acquire businesses, gross | $ 1,393,508.9 |  |  |  |  |  |
Stock issued for acquisition | $ 464,900,000 |  | $ 464,918,000 |  |  |  |
Number of bank branches acquired | branch |  |  |  |  |  | 35 |
Assets acquired, after acquisition method adjustments |  |  |  |  |  | $ 3,110,000,000 |
Loans acquired, after acquisition method adjustments |  |  |  |  | $ 0 | 2,290,000,000 | $ 35,200,000
Customer deposits acquired, after acquisition method adjustments |  |  |  |  |  | $ 2,720,000,000 |
Goodwill acquired |  | $ 174,146,000 |  |  |  |  |
Acquisition-related costs |  |  |  | $ 18,700,000 |  |  |

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