Goodwill and Intangible Assets (Details) (USD $)	0 Months Ended	12 Months Ended
	Nov. 07, 2012 item	Dec. 31, 2013	Dec. 31, 2012
Changes in the carrying amount of goodwill
Goodwill at the beginning of the period			$ 21,096,000
Impairment of goodwill			(21,096,000)
Goodwill at the end of the period			1,212,000
Goodwill resulting from transaction			1,212,000
RangeMark
Changes in the carrying amount of goodwill
RangeMark acquisition			1,212,000
RangeMark disposition - Impairment		(1,212,000)
Goodwill at the end of the period	1,200,000
Aggregate purchase consideration	2,500,000
Number of installments in which purchase consideration is payable	4
Goodwill resulting from transaction	1,200,000
Segment, MBS & Rates
Changes in the carrying amount of goodwill
Goodwill at the beginning of the period			17,364,000
Impairment of goodwill			(17,364,000)
Goodwill at the end of the period			1,212,000
Goodwill resulting from transaction			1,212,000
Segment, MBS & Rates | RangeMark
Changes in the carrying amount of goodwill
RangeMark acquisition			1,212,000
RangeMark disposition - Impairment		(1,212,000)
Segment Inv. Banking
Changes in the carrying amount of goodwill
Goodwill at the beginning of the period			3,732,000
Impairment of goodwill			$ (3,732,000)