THE FREMF TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Interest income	$ 7,826,000	$ 8,117,000	$ 8,480,000	$ 9,194,000	$ 8,954,000	$ 9,832,000	$ 10,289,000	$ 9,983,000
Interest expense	3,187,000	3,285,000	3,696,000	5,018,000	5,589,000	6,036,000	6,242,000	5,776,000
Net interest income	4,639,000	4,832,000	4,784,000	4,176,000	3,365,000	3,796,000	4,047,000	4,207,000	$ 18,430,514	$ 15,413,842
General and administrative fees									(3,518,500)	(4,335,376)
Net income	$ 2,469,000	$ 2,551,000	$ 1,878,000	$ 1,551,000	$ 1,222,000	$ 2,158,000	$ 1,394,000	$ 1,475,000	$ 8,449,770	6,248,890
FREMF Trusts
Variable Interest Entity [Line Items]
Interest income										78,361
Interest expense										0
Net interest income										78,361
General and administrative fees										(709,439)
Unrealized gain (loss) on multifamily loans held in securitization trusts										694,339
Net income										$ 63,261