Goodwill And Intangible Assets (Carrying Amount Of Goodwill And Intangible Assets) (Details) - USD ($)		12 Months Ended
	Jul. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance		$ 795,026,000
Goodwill, Net additions		120,576,000
Indicators of impairment	$ 0
Goodwill, Ending balance		915,602,000	$ 795,026,000
Intangible assets, Beginning balance		54,563,000
Intangible assets, Net additions		19,037,000
Intangible assets, Amortization		(10,423,000)	(12,366,000)	$ (12,131,000)
Intangible assets, Ending balance		63,177,000	54,563,000
Global Wealth Management [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance		177,171,000
Goodwill, Net additions		118,213,000
Goodwill, Ending balance		295,384,000	177,171,000
Intangible assets, Beginning balance		23,503,000
Intangible assets, Net additions		12,084,000
Intangible assets, Amortization		(5,560,000)
Intangible assets, Ending balance		30,027,000	23,503,000
Institutional Group [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill, Beginning balance		617,855,000
Goodwill, Net additions		2,363,000
Goodwill, Ending balance		620,218,000	617,855,000
Intangible assets, Beginning balance		31,060,000
Intangible assets, Net additions		6,953,000
Intangible assets, Amortization		(4,863,000)
Intangible assets, Ending balance		$ 33,150,000	$ 31,060,000