Goodwill and Intangible Assets (Carrying Amount of Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	$ 1,181,998
Goodwill, Adjustments	315
Goodwill, Ending balance	1,182,313
Intangible assets, Beginning balance	140,984
Intangible assets, Adjustments	60
Intangible assets, Amortization	(4,268)	$ (5,032)
Intangible assets, Ending balance	136,776
Global Wealth Management [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	335,009
Goodwill, Ending balance	335,009
Intangible assets, Beginning balance	44,671
Intangible assets, Amortization	(1,305)
Intangible assets, Ending balance	43,366
Institutional Group [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance	846,989
Goodwill, Adjustments	315
Goodwill, Ending balance	847,304
Intangible assets, Beginning balance	96,313
Intangible assets, Adjustments	60
Intangible assets, Amortization	(2,963)
Intangible assets, Ending balance	$ 93,410