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Residential Mortgage Loans Held in Securitization Trusts (Net) and Real Estate Owned - Activity in Real Estate Owned Held in Residential Securitization Trust (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]    
Balance at beginning of period $ 150 $ 411
Write downs 0 0
Transfer from/(to) mortgage loans held in securitization trusts 742 173
Disposal (150) (411)
Balance at the end of period $ 742 $ 173