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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, 2016
Dec. 31, 2015
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
UPB of loans transferred $ 10,485,697 $ 7,471,025
Maximum exposure to loss 10,617,758 7,552,958
Mortgage Servicing Rights, at Amortized Cost [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets 94,492 54,729
Mortgage Servicing Rights, at Fair Value [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets 233 236
Advances And Match Funded Advances [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets $ 37,336 $ 26,968