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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 21, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  | $ 855,453,000 | $ 855,453,000 | $ 790,972,000 |
Percentage of fair value of reporting unit in excess of net book value | 17.00% |  |  |  |
Goodwill impairment charges |  | $ 0 | 0 | $ 0 |
Estimated amortization expense succeeding period |  | 5 years |  |  |
Core Deposit Intangibles [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-average remaining life |  | 9 years |  |  |
Other Identifiable Intangibles [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-average remaining life |  | 14 years |  |  |
MidSouth [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  | $ 63,369,000 | $ 63,400,000 |  | $ 63,400,000

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