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Goodwill and Other Intangible Assets - Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Total | $ 106,235 | $ 111,110 |
Core deposit intangible |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 153,496 | 146,355 |
Accumulated amortization | (59,634) | (48,992) |
Total | 93,862 | 97,363 | $ 111,808
Books of Business Intangible |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 19,937 | 19,937 |
Accumulated amortization | (7,564) | (6,190) |
Total | $ 12,373 | $ 13,747 | $ 15,532

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