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Securitizations and Variable Interest Entities - Schedule of Assets That Relate to Continuing Involvement with Transferred Financial Assets with Servicing Rights and Maximum Exposure to Loss Including the Unpaid Principal Balance (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
UPB of loans transferred $ 34,717,859 $ 31,864,769
Maximum exposure to loss 35,270,404 32,376,765
GinnieMae    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
UPB of loans transferred 5,500,000 5,600,000
Mortgage Servicing Rights - Fair Value    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets 449,129 360,830
Advances    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets $ 103,416 $ 151,166