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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, 2017
Dec. 31, 2016
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
UPB of loans transferred $ 12,077,635 $ 10,485,697
Maximum exposure to loss 12,233,330 10,617,758
Mortgage Servicing Rights, at Amortized Cost [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets 97,832 94,492
Mortgage Servicing Rights, at Fair Value [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets 227 233
Advances And Match Funded Advances [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets $ 57,636 $ 37,336