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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
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Mortgage servicing rights (MSRs), at fair value $ 1,400,217 $ 1,294,817  
Unamortized debt issuance costs (Other secured borrowings, net) 7,071 9,556  
Debt service accounts 15,930   $ 15,868
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 584,872 476,371  
Unamortized debt issuance costs (Other secured borrowings, net) 606 1,183  
Debt service accounts 213 211  
Short-term debt $ 250,000 $ 210,755