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Securitizations and Variable Interests Entities - Schedule of Carrying Amounts of Assets that Relate to Continuing Involvement with Transferred Forward Loans (Parenthetical) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value Mortgage Servicing Rights [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Fair value of assets $ 132,774 $ 227