THE FREMF TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Interest expense	$ 5,571,000	$ 4,604,000	$ 12,981,000	$ 18,398,000	$ 17,938,000	$ 17,881,000	$ 16,767,000	$ 16,408,000
Net interest income	4,598,000	5,115,000	4,570,000	3,118,000	4,782,000	4,746,000	4,828,000	5,784,000	$ 17,400,715	$ 20,139,551
General and administrative fees									(4,006,774)	(5,454,786)
Net income (loss)	$ 350,000	$ 4,353,000	$ (21,490,000)	$ 11,315,000	$ 8,891,000	$ (4,256,000)	$ (2,297,000)	$ 2,369,000	(5,471,462)	4,706,961
FREMF Trusts
Variable Interest Entity [Line Items]
Interest income									20,891,992	54,271,017
Interest expense									19,652,710	51,440,694
Net interest income									1,239,282	2,830,323
General and administrative fees									(887,388)	(2,551,296)
Unrealized gain (loss) on multi-family loans held in securitization trusts									(6,398,347)	3,353,365
Net income (loss)									$ (6,046,453)	$ 3,632,392