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Acquisitions and Divestiture (Schedule of Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |
Goodwill, Beginning Balance | $ 790,972 | $ 745,523
Goodwill, Ending Balance | 855,453 | 790,972
Trust And Asset Management Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill, Beginning Balance | 46,600 |
Final settlement of cash consideration - acquisition of trust and asset management business | 1,112 |
Goodwill, Initial goodwill recorded |  | 45,634
Goodwill, Measurement period adjustments |  | (185)
Goodwill, Ending Balance |  | $ 46,600
MidSouth [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill, Initial goodwill recorded | 69,207 |
Goodwill, Measurement period adjustments | (5,838) |
Goodwill, Ending Balance | $ 63,369 |

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