Goodwill and Intangible Assets (Carrying Amount of Goodwill and Intangible Assets) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Goodwill, Beginning balance			$ 301,919
Goodwill, Net additions			7,600
Goodwill, Impairment losses			0
Goodwill, Ending balance	309,519		309,519
Intangible assets, Beginning balance			34,595
Intangible assets, Adjustments			(441)
Intangible assets, Amortization	(1,300)	(700)	(2,377)	(1,472)
Intangible assets, Ending balance	31,777		31,777
Global Wealth Management [Member]
Goodwill, Beginning balance			128,524
Goodwill, Net additions			5,410
Goodwill, Impairment losses			0
Goodwill, Ending balance	133,934		133,934
Intangible assets, Beginning balance			21,463
Intangible assets, Adjustments			0
Intangible assets, Amortization			(1,439)
Intangible assets, Ending balance	20,024		20,024
Institutional Group [Member]
Goodwill, Beginning balance			173,395
Goodwill, Net additions			2,190
Goodwill, Impairment losses			0
Goodwill, Ending balance	175,585		175,585
Intangible assets, Beginning balance			13,132
Intangible assets, Adjustments			(441)
Intangible assets, Amortization			(938)
Intangible assets, Ending balance	$ 11,753		$ 11,753