USE OF SPECIAL PURPOSE ENTITIES AND VARIABLE INTEREST ENTITIES - Condensed Consolidated Balance Sheets (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 9,912,051	$ 34,347,339
Accrued interest receivable	2,542,868	8,852,036
Investment related receivable	16,242,900	7,461,128
Loans held for investment	544,586,537	0
Total Assets	680,811,728	2,612,541,116
Accrued interest payable	854,060	6,194,464
Collateralized loan obligation (net of discount of $2,716,862 and deferred financing costs of $3,977,017 for September 30, 2018)	503,487,121
Fees and expenses payable to Manager	3,001,338	752,000
Total Liabilities	528,749,462	$ 2,466,749,839
Hunt CRE 2017-FL1, Ltd.
Variable Interest Entity [Line Items]
Cash and cash equivalents	77,694,265
Accrued interest receivable	2,403,506
Investment related receivable	16,242,900
Loans held for investment	540,531,960
Total Assets	636,872,631
Accrued interest payable	750,625
Collateralized loan obligation (net of discount of $2,716,862 and deferred financing costs of $3,977,017 for September 30, 2018)	503,487,121
Fees and expenses payable to Manager	1,816,338
Total Liabilities	$ 506,054,084