THE FREMF TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Variable Interest Entity [Line Items]
Net interest income	$ 5,114,636	$ 4,745,766	$ 12,802,118	$ 15,357,448
General and administrative fees	(796,600)	(1,288,978)	(3,148,945)	(4,120,807)
Unrealized gain (loss) on multi-family loans held in securitization trusts			(5,861,373)	2,797,566
Net income (loss)	4,353,026	(4,256,337)	(5,822,037)	(4,183,767)
FREMF Trusts
Variable Interest Entity [Line Items]
Interest income	336,824	13,473,913	20,540,942	40,992,241
Interest expense	237,980	12,766,808	19,404,532	38,866,888
Net interest income	98,844	707,105	1,136,410	2,125,353
General and administrative fees	(56,186)	(634,222)	(934,496)	(1,922,771)
Unrealized gain (loss) on multi-family loans held in securitization trusts	957,549	694,730	(5,861,373)	2,797,566
Net income (loss)	$ 1,000,207	$ 767,613	$ (5,659,459)	$ 3,000,148