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Business Combinations (Details) $ in Thousands | Aug. 01, 2024 USD ($) branch shares | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Mar. 31, 2024 USD ($)
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Total assets at period end |  | $ 65,870,066 | $ 64,879,668 | $ 57,576,933
Deposits |  | $ 53,570,038 | $ 52,512,349 | $ 46,448,858
Macatawa Bank Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total assets at period end | $ 2,900,000 |  |  |
Deposits | 2,300,000 |  |  |
Loan | $ 1,300,000 |  |  |
Macatawa Bank Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition, number of shares issued (in shares) | shares | 4,700,000 |  |  |
Fair value of consideration paid | $ 499,300 |  |  |
Business combination, number of acquired operating branches | branch | 26 |  |  |
Business combination, discount on acquired loans | $ 53,700 |  |  |
Business combination, discount on securities | 33,500 |  |  |
Business combination, intangible assets acquired | $ 253,000 |  |  |
Macatawa Bank Corporation | Macatawa Bank Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of common stock shares issued for each share of acquiree stock (in shares) | shares | 0.137 |  |  |

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