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Related Parties Related Parties - Additional Informationl (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Related Party Transaction [Line Items]          
Subordinated Borrowings $ 16,550   $ 16,550   $ 22,550
Investment Management [Member] | Private Equity Fund [Member]          
Related Party Transaction [Line Items]          
Revenue from Related Parties 1,433 $ 3,377 10,182 $ 6,264  
Investment Banking [Member] | Director [Member]          
Related Party Transaction [Line Items]          
Revenue from Related Parties 11,981   13,282    
Other Assets [Member]          
Related Party Transaction [Line Items]          
Due from Related Parties, Noncurrent $ 17,707   $ 17,707   $ 6,967