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Investment Securities - Available for sale sponsored funds with fair values below carrying values (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
Unrealized losses    
Securities in an unrealized loss position | security 12  
Corporate bonds    
Fair value    
Less than 12 months $ 19,987 $ 36,302
12 months or longer 27,105 119,480
Total fair value 47,092 155,782
Unrealized losses    
Less than 12 months (19) (160)
12 months or longer (20) (1,209)
Total unrealized losses $ (39) $ (1,369)