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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
Sep. 30, 2020
Dec. 31, 2019
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
UPB of loans transferred $ 17,126,989 $ 14,490,984
Maximum exposure to loss 17,410,945 14,742,394
Mortgage Servicing Rights - Fair Value    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets 101,506 109,581
Advances and Match Funded Advances    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets $ 182,450 $ 141,829