USE OF SPECIAL PURPOSE ENTITIES AND VARIABLE INTEREST ENTITIES - Summary of Loan and Borrowing Characteristics (Details)	Sep. 30, 2018 USD ($)
Variable Interest Entity [Line Items]
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
Hunt CRE 2017-FL1, Ltd.
Variable Interest Entity [Line Items]
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
Face Amount
Variable Interest Entity [Line Items]
Collateralized loan obligation (net of discount of $2,716,862 and deferred financing costs of $3,977,017 for September 30, 2018)	510,181,000
Face Amount | Hunt CRE 2017-FL1, Ltd.
Variable Interest Entity [Line Items]
Unpaid Principal Balance	540,531,960
Collateralized loan obligation (net of discount of $2,716,862 and deferred financing costs of $3,977,017 for September 30, 2018)	510,181,000
Carrying Value
Variable Interest Entity [Line Items]
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
Carrying Value | Hunt CRE 2017-FL1, Ltd.
Variable Interest Entity [Line Items]
Carrying Value	540,531,960
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