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Investment Securities - Available for sale sponsored funds with fair values below carrying values (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Unrealized losses      
Securities in an unrealized loss position | security 3    
Other-than-temporary impairment of available for sale securities $ 0    
Net unrealized gains (losses) on trading debt securities 400 $ (100) $ (300)
Net unrealized gains (losses) on equity securities 25,000 (22,800) $ 2,200
Equity securities 214,176 200,309  
Corporate bonds      
Fair value      
Less than 12 months 4,538 36,302  
12 months or longer 8,056 119,480  
Total fair value 12,594 155,782  
Unrealized losses      
Less than 12 months   (160)  
12 months or longer (5) (1,209)  
Total unrealized losses (5) (1,369)  
Sponsored privately offered funds      
Unrealized losses      
Equity securities $ 845 $ 678