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Goodwill and Other Intangible Assets (Narrative - Goodwill & Impairment Analysis) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Goodwill | $ 465,697 |  | $ 465,697 |  | $ 465,697
Goodwill impairment |  |  |  |  | $ 0
Core Deposit Intangibles |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment write downs on the core deposit intangibles | $ 0 | $ 0 | $ 0 | $ 0 |

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