THE FREMF TRUSTS - Narrative (Details) - FREMF Trusts - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Balance Sheet
Investment in Multi-Family MBS, carrying value	$ 20,444,569	$ 18,342,040
Multi-family mortgage loans held in securitization trusts, unpaid principal balance	1,102,921,974	1,147,753,367
Multi-family securitized debt obligations, unpaid principal balance	$ 1,102,921,974	$ 1,147,753,367