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Securitizations and Variable Interest Entities - Schedule Of Carrying Value and Classification of Assets and Liabilities of Advance Financing Facilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Debt service accounts $ 13,271   $ 14,873
Unamortized debt issuance costs (Other secured borrowings, net) 8,338 $ 9,556  
Advance match funded liabilities (related to VIEs) 516,572 581,288  
Variable Interest Entity, Primary Beneficiary | Advance Match Funded Liabilities      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Match funded advances (Advances, net) 594,645 651,576  
Debt service accounts 7,241 14,195  
Unamortized debt issuance costs (Other secured borrowings, net) 1,783 4,253  
Prepaid Interest 205 291  
Advance match funded liabilities (related to VIEs) $ 516,572 $ 581,288