Segment Reporting (Schedule Of Information Of Total Assets On Segment Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 19,533,575	$ 19,129,356
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	16,692,046	16,065,503
Institutional Group [Member]
Segment Reporting Information [Line Items]
Total assets	2,464,369	2,657,183
Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 377,160	$ 406,670