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Securitizations and Variable Interests Entities - Schedule of Carrying Amounts of Assets that Relate to Continuing Involvement with Transferred Forward Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
UPB of loans transferred $ 31,864,769 $ 18,062,856
Maximum exposure to loss 32,376,765 18,343,246
Ginnie Mae    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
UPB of loans transferred 5,600,000 4,100,000
Mortgage Servicing Rights    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets 360,830 137,029
Advances    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets $ 151,166 $ 143,361