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Investment Securities - Consolidated Sponsored Funds (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Investment Securities    
Cash $ 165,259 $ 151,815
Redeemable noncontrolling interests   (19,205)
Consolidated Sponsored Funds    
Investment Securities    
Cash   1,530
Investments   43,567
Other assets   483
Redeemable noncontrolling interests   (19,205)
Net interest in consolidated sponsored funds   $ 26,375