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Investment Securities - Available for sale sponsored funds with fair values below carrying values (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
security
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Unrealized losses      
Securities in an unrealized loss position | security 24    
Net unrealized gains (losses) on equity securities $ (35,900) $ 13,100  
Corporate bonds      
Fair value      
Less than 12 months 93,046   $ 4,538
12 months or longer     8,056
Total fair value 93,046   12,594
Unrealized losses      
Less than 12 months (1,385)    
12 months or longer     (5)
Total unrealized losses $ (1,385)   $ (5)