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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) |  |  | 3 Months Ended
--- | --- | --- | ---
Feb. 15, 2022 | Aug. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Goodwill [Line Items] |  |  |  |
Acquisitions and adjustments |  |  | $ 960,163,000 | $ 0
Goodwill impairment |  | $ 0 |  |
Impairment charges |  |  | 0 | 0
Amortization of other intangible assets |  |  | $ 4,811,000 | $ 3,075,000
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 |  |  | $ 960,200,000 |
First Midwest | Core deposit |  |  |  |
Goodwill [Line Items] |  |  |  |
Estimated useful lives | 10 years |  |  |
First Midwest | Customer trust relationships |  |  |  |
Goodwill [Line Items] |  |  |  |
Estimated useful lives | 13 years |  |  |

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