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Securitizations and Variable Interests Entities - Schedule of Carrying Value of Assets and Liabilities of Agency MSR Financing Facility (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Mortgage servicing rights, at fair value $ 2,250,147 $ 1,294,817  
Prepaid lender fees, net 7,150 9,556  
Debt service accounts 9,968 20,141 $ 23,276
Agency Mortgage Servicing Rights Financing Facility | Variable Interest Entity, Primary Beneficiary      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Mortgage servicing rights, at fair value 630,605 476,371  
Prepaid lender fees, net 1,495 1,183  
Debt service accounts 104 211  
Senior notes $ 317,523 $ 210,755