Goodwill and Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			$ 1,181,998
Goodwill, Adjustments			315
Goodwill, Ending balance	$ 1,182,313		1,182,313
Intangible assets, Beginning balance	127,725		140,984
Intangible assets, Adjustments / Sale of ZCM			(43)
Intangible assets, Amortization	(4,500)	$ (4,700)	(13,216)	$ (14,489)
Intangible assets, Ending balance	127,725		127,725
Global Wealth Management [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			335,009
Goodwill, Ending balance	335,009		335,009
Intangible assets, Beginning balance	40,352		44,671
Intangible assets, Amortization			(4,319)
Institutional Group [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance			846,989
Goodwill, Adjustments			315
Goodwill, Ending balance	847,304		847,304
Intangible assets, Beginning balance	$ 87,373		96,313
Intangible assets, Adjustments / Sale of ZCM			(43)
Intangible assets, Amortization			$ (8,897)