USE OF SPECIAL PURPOSE ENTITIES AND VARIABLE INTEREST ENTITIES - Summary of Loan and Borrowing Characteristics (Details) - USD ($)	Jun. 30, 2018	Apr. 30, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Collateralized loan obligations	$ 287,738,948		$ 0
Hunt CRE 2017-FL1, Ltd.
Variable Interest Entity [Line Items]
Collateralized loan obligations	287,738,948
Face Amount
Variable Interest Entity [Line Items]
Collateralized loan obligations	290,732,000
Face Amount | Hunt CRE 2017-FL1, Ltd.
Variable Interest Entity [Line Items]
Outstanding Face Amount	320,907,160
Collateralized loan obligations	290,732,000	$ 290,700,000
Carrying Value
Variable Interest Entity [Line Items]
Collateralized loan obligations	287,738,948
Carrying Value | Hunt CRE 2017-FL1, Ltd.
Variable Interest Entity [Line Items]
Carrying Value	320,907,160
Collateralized loan obligations	$ 287,738,948	$ 287,600,000