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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, 2021
Dec. 31, 2020
Sep. 30, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
MSRs pledged (MSRs, at fair value) $ 2,176,260 $ 1,294,817  
Unamortized debt issuance costs (Other secured borrowings, net) 8,338 9,556  
Debt service accounts 13,271   $ 14,873
Variable Interest Entity, Primary Beneficiary | Secured Debt | Agency Mortgage Servicing Rights Financing Facility      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
MSRs pledged (MSRs, at fair value) 649,202 476,371  
Unamortized debt issuance costs (Other secured borrowings, net) 2,290 1,183  
Debt service accounts 104 211  
Outstanding borrowings (MSR financing facilities, net) $ 349,298 $ 210,755