Segment Reporting (Schedule Of Information Of Total Assets On Segment Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 20,484,080	$ 19,129,356
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	17,619,527	16,065,503
Institutional Group [Member]
Segment Reporting Information [Line Items]
Total assets	2,484,337	2,657,183
Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 380,216	$ 406,670