RESIDENTIAL MORTGAGE LOAN SECURITIZATION TRUSTS - Narrative (Details) - Residential mortgage loans - USD ($)	9 Months Ended	12 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Investment in Non-Agency RMBS, carrying value	$ 0	$ 5,413,720
Residential mortgage loans held in securitization trust, unpaid balance		118,884,113
Residential mortgage loan securitized debt obligation, unpaid principal balance	$ 0	$ 118,884,113

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