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Acquisitions and Divestiture (Schedule of Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |
Goodwill, Beginning Balance | $ 745,523 | $ 621,193
Goodwill, Ending Balance | 790,972 | 745,523
FNBC Transactions [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill, Beginning Balance | 124,330 |
Goodwill, Ending Balance |  | 124,330
FNBC I [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill, Initial goodwill recorded |  | 95,568
Goodwill, Measurement period adjustments |  | 7,979
FNBC II [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill, Initial goodwill recorded |  | 23,009
Goodwill, Measurement period adjustments |  | $ (2,226)
Trust And Asset Management Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill, Initial goodwill recorded | 45,634 |
Goodwill, Measurement period adjustments | $ (185) |

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