Goodwill and Intangible Assets (Carrying Amount of Goodwill and Intangible Assets) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011
Goodwill, Ending balance	$ 358,988,000
Intangible assets, Beginning balance	34,595,000.0
Intangible assets, Adjustments	4,579,000
Intangible assets, Ending balance	33,863,000
Global Wealth Management [Member]
Goodwill, Beginning balance	128,524,000
Goodwill, Net additions	15,304,000.0
Goodwill, Ending balance	143,828,000.0
Intangible assets, Beginning balance	21,463,000.0
Intangible assets, Adjustments	192,000
Intangible assets, Amortization	2,836,000.0
Intangible assets, Ending balance	18,819,000
Institutional Group [Member]
Goodwill, Beginning balance	173,395,000
Goodwill, Net additions	41,765,000.0
Goodwill, Ending balance	215,160,000.0
Intangible assets, Beginning balance	13,132,000.0
Intangible assets, Adjustments	4,387,000
Intangible assets, Amortization	2,475,000.0
Intangible assets, Ending balance	$ 15,044,000