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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Aug. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Line Items] |  |  |  |
Acquisitions and adjustments |  | $ 0 | $ 961,722,000 | $ 0
Goodwill impairment | $ 0 |  |  |
Impairment charges |  | 0 | 0 | 0
Amortization of other intangible assets |  | $ 24,155,000 | 25,857,000 | $ 11,336,000
Core Deposits and Other Intangible Assets | Minimum |  |  |  |
Goodwill [Line Items] |  |  |  |
Estimated useful lives |  | 5 years |  |
Core Deposits and Other Intangible Assets | Maximum |  |  |  |
Goodwill [Line Items] |  |  |  |
Estimated useful lives |  | 15 years |  |
Core deposit |  |  |  |
Goodwill [Line Items] |  |  |  |
Estimated fair value of intangible assets acquired |  |  | 77,900,000 |
Customer trust relationships |  |  |  |
Goodwill [Line Items] |  |  |  |
Estimated fair value of intangible assets acquired |  |  | 39,700,000 |
First Midwest |  |  |  |
Goodwill [Line Items] |  |  |  |
Acquisitions and adjustments |  |  | $ 961,700,000 |

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