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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 1,320,799,000 | $ 1,320,799,000
Goodwill impairment | $ 0 | $ 0
Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 8 years |
Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 15 years |
Core Deposit Premium | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 10 years |
Core Deposit Premium | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 15 years |

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