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Business Combinations (Schedule of Goodwill) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |
Goodwill, Beginning Balance | $ 855,453,000 | $ 790,972,000
Goodwill, Ending Balance | 855,453,000 | 855,453,000
MidSouth [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill, Initial goodwill recorded |  | 69,207,000
Goodwill, Measurement period adjustments | 0 | (5,838,000)
Goodwill, Ending Balance | $ 63,369,000 |
Trust and Asset Management Business [Member] |  |
Business Acquisition [Line Items] |  |
Final settlement of cash consideration - acquisition of trust and asset management business |  | $ 1,112,000

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