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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, 2019
Dec. 31, 2018
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
UPB of loans transferred $ 14,077,333 $ 15,600,971
Maximum exposure to loss 14,313,949 15,872,424
Mortgage Servicing Rights - Fair Value [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets 93,533 132,774
Advances And Match Funded Advances [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets $ 143,083 $ 138,679