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Restricted Cash (Restricted Cash Components) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Restricted Cash And Cash Equivalents Items [Line Items]      
Restricted cash $ 1,050 $ 1,450 $ 1,050
Regulatory Requirements [Member]      
Restricted Cash And Cash Equivalents Items [Line Items]      
Restricted cash 0 400  
Obligations Under Agreement of Loans Sold with Recourse [Member]      
Restricted Cash And Cash Equivalents Items [Line Items]      
Restricted cash $ 1,050 $ 1,050