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Securitizations and Variable Interest Entities - Schedule Of Carrying Value and Classification of Assets and Liabilities of Agency MSR Financing Facility (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Mortgage servicing rights (MSRs), at fair value $ 1,069,013 $ 1,486,395  
Unamortized debt issuance costs (Other secured borrowings, net) 10,767 8,647  
Debt service accounts 14,873   $ 17,026
Variable Interest Entity, Primary Beneficiary | Secured Debt | Agency Mortgage Servicing Rights Financing Facility      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Mortgage servicing rights (MSRs), at fair value 234,106 245,533  
Unamortized debt issuance costs (Other secured borrowings, net) 1,775 946  
Debt service accounts 102 100  
Short-term debt $ 113,929 $ 147,706