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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 745,523 | $ 621,193 |
Goodwill impairment charges | $ 0 | $ 0 | $ 0
Core Deposit Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted-average remaining life | 9 years |  |
Other Identifiable Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted-average remaining life | 6 years |  |
FNBC Transaction [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 124,330 |  |

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