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Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 27, 2019 | Sep. 03, 2019 | Jul. 01, 2019 | Jan. 02, 2019 | Dec. 31, 2018
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill | $ 1,158,123 |  | $ 1,158,123 |  |  |  |  |  | $ 1,034,679
Amortization of intangible assets | $ 3,800 | $ 3,000 | $ 10,960 | $ 8,741 |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Weighted-average remaining lives of intangible assets |  |  | 9 years 8 months 12 days |  |  |  |  |  |
Trade Name [Member] |  |  |  |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Weighted-average remaining lives of intangible assets |  |  | 9 years |  |  |  |  |  |
Core Deposits [Member] |  |  |  |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Weighted-average remaining lives of intangible assets |  |  | 4 years 4 months 24 days |  |  |  |  |  |
Non-Compete Agreements [Member] |  |  |  |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Weighted-average remaining lives of intangible assets |  |  | 9 years 3 months 18 days |  |  |  |  |  |
First Empire [Member] |  |  |  |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 22,700 |
Mooreland [Member] |  |  |  |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 37,400 |  |
B&F [Member] |  |  |  |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 19,600 |  |  |
GKB [Member] |  |  |  |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 45,200 |  |  |  |

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