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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Apr. 01, 2024
Goodwill [Line Items] |  |  |  |  |
Acquisitions and adjustments |  | $ 176,535,000 | $ 0 | $ 961,722,000 |
Goodwill impairment | $ 0 |  |  |  |
Impairment charges |  | 0 | 0 | 0 |
Amortization of other intangible assets |  | $ 27,528,000 | $ 24,155,000 | 25,857,000 |
Core deposit | Minimum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Estimated useful lives |  | 5 years |  |  |
Core deposit | Maximum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Estimated useful lives |  | 15 years |  |  |
CapStar Financial Holdings, Inc. |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquisitions and adjustments |  | $ 176,500,000 |  |  |
CapStar Financial Holdings, Inc. | Core deposit |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Estimated useful lives |  |  |  |  | 10 years
Estimated fair value of intangible assets acquired |  | $ 46,100,000 |  |  |
First Midwest |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquisitions and adjustments |  |  |  | 961,700,000 |
First Midwest | Core deposit |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Estimated fair value of intangible assets acquired |  |  |  | 77,900,000 |
First Midwest | Customer trust relationships |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Estimated fair value of intangible assets acquired |  |  |  | $ 39,700,000 |

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