Goodwill and Intangible Assets (Narrative) (Details)	12 Months Ended
	Dec. 31, 2011
Customer Relationships [Member]
Weighted-average remaining lives of intangible assets	7.1
Trade Name [Member]
Weighted-average remaining lives of intangible assets	8.3
Investment Banking Backlog [Member]
Weighted-average remaining lives of intangible assets	12.0