Goodwill and Intangible Assets (Intangible Assets Subject to Amortization) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Gross carrying value	$ 54,299,000.0	$ 49,720,000
Accumulated Amortization	20,436,000	15,125,000.0
Customer Relationships [Member]
Gross carrying value	40,166,000.0	37,068,000
Accumulated Amortization	14,827,000	11,015,000.0
Trade Name [Member]
Gross carrying value	9,442,000.0	7,981,000
Accumulated Amortization	1,011,000	364,000.0
Non-Compete Agreement [Member]
Gross carrying value	2,441,000.0	2,441,000
Accumulated Amortization	2,441,000	2,238,000.0
Investment Banking Backlog [Member]
Gross carrying value	2,250,000.0	2,230,000
Accumulated Amortization	$ 2,157,000	$ 1,508,000.0