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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, 2015
Dec. 31, 2014
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
UPB of loans transferred $ 7,471,025 $ 9,353,187
Maximum exposure to loss 7,552,958 9,439,805
Mortgage Servicing Rights, at Amortized Cost [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets 54,729 82,542
Mortgage Servicing Rights, at Fair Value [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets 236 2,840
Advances And Match Funded Advances [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets $ 26,968 $ 1,236