Segment Reporting (Schedule Of Information Of Total Assets On Segment Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 24,183,559	$ 24,519,598
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	20,350,939	21,040,224
Institutional Group [Member]
Segment Reporting Information [Line Items]
Total assets	3,567,420	3,238,617
Other Segments [Member]
Segment Reporting Information [Line Items]
Total assets	$ 265,200	$ 240,757