THE FREMF TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Variable Interest Entity [Line Items]
Net interest income	$ 4,046,715		$ 4,569,910		$ 8,253,262	$ 7,687,482
General and administrative fees	(895,659)		(962,284)		(2,362,344)	(2,352,345)
Unrealized gain (loss) on multi-family loans held in securitization trusts					694,339	(6,818,922)
Net income (loss)	1,394,170	$ 1,474,767	(21,490,063)	$ 11,315,000	2,868,937	(10,175,063)
FREMF Trusts
Variable Interest Entity [Line Items]
Interest income	0		6,976,930		78,361	20,204,118
Interest expense	0		6,640,257		0	19,166,552
Net interest income	0		336,673		78,361	1,037,566
General and administrative fees	0		(255,056)		0	(878,310)
Unrealized gain (loss) on multi-family loans held in securitization trusts	0		(5,463,148)		694,339	(6,818,922)
Net income (loss)	$ 0		$ (5,381,531)		$ 772,700	$ (6,659,666)