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Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jan. 02, 2019 | Dec. 31, 2018
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |
Goodwill | $ 1,056,111 |  |  | $ 1,034,679
Amortization of intangible assets | $ 3,593 | $ 2,738 |  |
Customer Relationships [Member] |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |
Weighted-average remaining lives of intangible assets | 10 years |  |  |
Trade Name [Member] |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |
Weighted-average remaining lives of intangible assets | 9 years 4 months 24 days |  |  |
Core Deposits [Member] |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |
Weighted-average remaining lives of intangible assets | 4 years 9 months 18 days |  |  |
Non-Compete Agreements [Member] |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |
Weighted-average remaining lives of intangible assets | 9 years 7 months 6 days |  |  |
First Empire [Member] |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |
Goodwill |  |  | $ 22,100 |
Weighted-average remaining lives of intangible assets | 14 years 9 months 18 days |  |  |

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