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Investment Securities - Available for sale sponsored funds with fair values below carrying values (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
security
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
security
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Unrealized losses          
Securities in an unrealized loss position | security 1   1    
Net unrealized gains (losses) on equity securities $ 28,100 $ 5,100 $ (7,800) $ 18,200  
Commercial paper          
Fair value          
Less than 12 months 2,429   2,429    
Total fair value $ 2,429   $ 2,429    
Corporate bonds          
Fair value          
Less than 12 months         $ 4,538
12 months or longer         8,056
Total fair value         12,594
Unrealized losses          
12 months or longer         (5)
Total unrealized losses         $ (5)