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Restricted Cash (Restricted Cash Components) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted cash $ 175 $ 1,375 $ 1,450
Regulatory requirements      
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted cash 0 325  
Obligations under agreement of loans sold with recourse      
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted cash $ 175 $ 1,050