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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, 2021
USD ($)
security
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Unrealized losses      
Securities in an unrealized loss position | security 0    
Net unrealized gains (losses) on equity securities $ 2,600 $ (35,900)  
Corporate bonds      
Fair value      
Less than 12 months     $ 2,414
Total fair value     2,414
Unrealized losses      
Less than 12 months     (15)
Total unrealized losses     $ (15)