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Acquisitions (Schedule of Goodwill) (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 USD ($)
Business Acquisition [Line Items] |
Goodwill, Beginning Balance | $ 621,193
Goodwill, Ending Balance | 739,403
FNBC Transaction [Member] |
Business Acquisition [Line Items] |
Goodwill, Ending Balance | 118,210
FNBC I [Member] |
Business Acquisition [Line Items] |
Goodiwll, Initial good will recorded | 95,568
Goodwill, Measurement period adjustments | 495
FNBC II [Member] |
Business Acquisition [Line Items] |
Goodiwll, Initial good will recorded | 23,009
Goodwill, Measurement period adjustments | $ (862)

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