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Goodwill and Other Intangible Assets - Changes in Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Finite-lived Intangible Assets [Roll Forward] |  |  |
Other intangible assets, beginning of period | $ 97,242 |  |
Amortization | (3,527) | $ (3,850) |
Other intangible assets, end of period | 93,714 |  | $ 97,242
Core deposit premiums: |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Other intangible assets, beginning of period | 87,575 | 101,344 | 101,344
Amortization | (3,120) |  | (13,769)
Other intangible assets, end of period | 84,455 |  | 87,575
Books of business and other intangibles: |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Other intangible assets, beginning of period | 9,667 | $ 11,301 | 11,301
Amortization | (408) |  | (1,634)
Other intangible assets, end of period | $ 9,259 |  | $ 9,667

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