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Business Combinations (Schedule of Goodwill) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |
Goodwill, Beginning Balance | $ 790,972 | $ 745,523
Initial goodwill recorded - acquisition of trust and asset management business |  | 45,634
Measurement period adjustments - acquisition of trust and asset management business |  | (185)
Final settlement of cash consideration - acquisition of trust and asset management business | 1,112 |
Goodwill, Ending Balance | 861,291 | $ 790,972
MidSouth [Member] |  |
Business Acquisition [Line Items] |  |
Initial goodwill recorded - acquisition of trust and asset management business | 69,207 |
Goodwill, Ending Balance | $ 69,207 |

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