Segment Reporting (Schedule Of Information Of Total Assets On Segment Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total assets	$ 23,760,048	$ 21,383,953
Global Wealth Management [Member]
Segment Reporting Information [Line Items]
Total assets	19,874,154	17,717,617
Institutional Group [Member]
Segment Reporting Information [Line Items]
Total assets	3,511,720	3,313,304
Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 374,174	$ 353,032