THE FREMF TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Variable Interest Entity [Line Items]
Net interest income	$ 4,569,910	$ 4,827,921	$ 7,687,482	$ 10,611,682
General and administrative fees	(962,284)	(1,243,257)	(2,352,345)	(2,831,829)
Unrealized gain (loss) on multi-family loans held in securitization trusts			(6,818,922)	2,102,836
Net income (loss)	(21,490,063)	(2,296,571)	(10,175,063)	72,570
FREMF Trusts
Variable Interest Entity [Line Items]
Interest income	6,976,930	13,569,574	20,204,118	27,518,328
Interest expense	6,640,257	12,862,356	19,166,552	26,100,080
Net interest income	336,673	707,218	1,037,566	1,418,248
General and administrative fees	(255,056)	(639,615)	(878,310)	(1,288,549)
Unrealized gain (loss) on multi-family loans held in securitization trusts	(5,463,148)	803,206	(6,818,922)	2,102,836
Net income (loss)	$ (5,381,531)	$ 870,809	$ (6,659,666)	$ 2,232,535