Discontinued Operations - Revenue and Expenses from Discontinued Operation (Details) - OMHHF - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
REVENUE
Interest	$ 112	$ 625	$ 921	$ 1,674
Principal transactions, net	(2,380)	(5,648)	(9,008)	2,579
Gain on sale of assets	0	0	14,916	0
Other	4,073	11,081	16,631	21,160
Total revenue	1,805	6,058	23,460	25,413
EXPENSES
Compensation and related expenses	573	3,432	4,225	10,108
Communications and technology	40	79	201	275
Occupancy and equipment costs	37	75	399	225
Interest	28	313	408	853
Other	239	1,113	2,630	5,138
Total expenses	917	5,012	7,863	16,599
Income before income taxes	888	1,046	15,597	8,814
Income (Loss) from Discontinued Operations, before tax, Attributable to Noncontrolling Interest	$ 145	$ 171	$ 2,545	$ 1,438