Segment Reporting (Schedule Of Information Of Total Assets On Segment Basis) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Total assets	$ 6,139,530	$ 4,951,900
Global Wealth Management [Member]
Total assets	4,509,359	3,637,069
Institutional Group [Member]
Total assets	1,275,724	1,028,948
Other [Member]
Total assets	$ 354,447	$ 285,883