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Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Amortized Cost, Due in 1 year or less $ 54,652  
Amortized Cost, Due after 1 year through 5 years 85,421  
Amortized Cost, Due after 5 years through 10 years 188,475  
Amortized Cost, Due after 10 years 31,442  
Amortized Cost, Total 359,990  
Fair Value, Due in 1 year or less 55,208  
Fair Value, Due after 1 year through 5 years 89,213  
Fair Value, Due after 5 years through 10 years 202,974  
Fair Value, Due after 10 years 32,576  
Fair Value, Total $ 379,971 $ 422,665