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Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 01, 2018 | Aug. 31, 2018 | Mar. 19, 2018
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill | $ 1,034,679 | $ 968,834 |  |  |  |
Amortization of intangible assets | 12,557 | 12,135 | $ 14,427 |  |  |
Global Wealth Management [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill | 340,395 | $ 276,477 |  |  |  |
Amortization of intangible assets | $ 5,773 |  |  |  |  |
Core Deposits [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets | 4 years 10 months 24 days |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets | 10 years 6 months |  |  |  |  |
Trade Name [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets | 9 years 7 months 6 days |  |  |  |  |
Non-Compete Agreements [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets | 8 years 9 months 18 days |  |  |  |  |
Ziegler [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 19,000
Ziegler [Member] | Customer Relationships and Non-Compete Agreements [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  | $ 9,500
Business Bancshares, Inc. [Member] | Global Wealth Management [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 38,400 |
Business Bancshares, Inc. [Member] | Core Deposits [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 8,600 |
Rand & Associates [Member] | Global Wealth Management [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 8,300 |  |
Rand & Associates [Member] | Customer Relationships [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 4,600 |  |

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