Goodwill and Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			$ 1,034,679
Goodwill, Adjustments			123,444
Goodwill, Ending balance	$ 1,158,123		1,158,123
Intangible assets, Beginning balance			119,655
Intangible assets, Net Additions			7,743
Intangible assets, Amortization	(3,800)	$ (3,000)	(10,960)	$ (8,741)
Intangible assets, Ending balance	116,438		116,438
Global Wealth Management [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			340,395
Goodwill, Adjustments			6,336
Goodwill, Ending balance	346,731		346,731
Intangible assets, Beginning balance			60,532
Intangible assets, Amortization			(5,527)
Intangible assets, Ending balance	55,005		55,005
Institutional Group [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			694,284
Goodwill, Adjustments			117,108
Goodwill, Ending balance	811,392		811,392
Intangible assets, Beginning balance			59,123
Intangible assets, Net Additions			7,743
Intangible assets, Amortization			(5,433)
Intangible assets, Ending balance	$ 61,433		$ 61,433