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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 1,320,799,000 |  | $ 1,319,598,000 |  |  | $ 1,320,799,000 | $ 1,319,598,000 |
Goodwill increase |  |  |  |  |  | 1,200,000 |  |
Goodwill impairment | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | 0 | 0 | $ 0
Amortization of intangibles |  |  |  |  |  | $ 16,306,000 | 15,915,000 | 13,494,000
Minimum |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Useful life (in years) | 8 years |  |  |  |  | 8 years |  |
Maximum |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Useful life (in years) | 15 years |  |  |  |  | 15 years |  |
Core Deposit Premium |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Amortization of intangibles |  |  |  |  |  | $ 14,672,000 | 14,346,000 | 12,100,000
Core Deposit Premium | Minimum |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Useful life (in years) | 10 years |  |  |  |  | 10 years |  |
Core Deposit Premium | Maximum |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Useful life (in years) | 15 years |  |  |  |  | 15 years |  |
Books of Business Intangible |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |
Amortization of intangibles |  |  |  |  |  | $ 1,634,000 | $ 1,569,000 | $ 1,400,000

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