ORGANIZATION AND BUSINESS OPERATIONS - Narrative (Details)	Apr. 30, 2018 USD ($) Loan_Participation	Jan. 18, 2018 USD ($) $ / shares shares	Jan. 17, 2018	Sep. 30, 2018 USD ($)	Aug. 20, 2018 USD ($)	Dec. 31, 2017 USD ($)
Variable Interest Entity [Line Items]
Total Assets				$ 680,811,728		$ 2,612,541,116
Total Liabilities				528,749,462		2,466,749,839
Cash and cash equivalents				9,912,051		34,347,339
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
Oaks Funding, LLC
Variable Interest Entity [Line Items]
Total Assets				0
Total Liabilities				0
Oaks Funding II, LLC
Variable Interest Entity [Line Items]
Total Assets				0
Total Liabilities				0
Hunt | Private Placement
Variable Interest Entity [Line Items]
Common stock issued (in shares) | shares		1,539,406
Common stock, shares issued (in dollars per share) | $ / shares		$ 4.77
Aggregate capital raise		$ 7,342,967
XL Investments | Hunt
Variable Interest Entity [Line Items]
Purchase premium (percentage)			56.90%
Outstanding common shares owned (percentage)		9.50%
XL Investments | Hunt | Private Placement
Variable Interest Entity [Line Items]
Common stock issued (in shares) | shares		710,495
Hunt CMT
Variable Interest Entity [Line Items]
Aggregate purchase price	$ 68,000,000
Number of loan participations | Loan_Participation	8
Assets acquired	$ 100,000
Loan participations acquired	6,200,000
Face Amount
Variable Interest Entity [Line Items]
Total Assets				632,192,853		45,622,602
Total Liabilities				510,181,000		1,234,522,000
Cash and cash equivalents				9,912,051		34,347,339
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]
Total Assets				632,192,853		45,622,602
Total Liabilities				503,487,121		1,234,522,000
Cash and cash equivalents				9,912,051		34,347,339
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. | Hunt CMT
Variable Interest Entity [Line Items]
Portfolio balance	339,400,000
Cash and cash equivalents	9,800,000
Hunt CRE 2017-FL1, Ltd. | 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)	290,700,000
Hunt CRE 2017-FL1, Ltd. | 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)	$ 287,600,000
Hunt CRE 2018-FL2, Ltd
Variable Interest Entity [Line Items]
Cash and cash equivalents					$ 59,700,000
Collateralized loan obligation (net of discount of $2,716,862 and deferred financing costs of $3,977,017 for September 30, 2018)					285,000,000
Unpaid Principal Balance				219,400,000	$ 225,300,000
Commercial real estate portfolio segment
Variable Interest Entity [Line Items]
Unpaid Principal Balance				544,586,537		$ 0
Carrying Value				544,586,537
Commercial real estate portfolio segment | Hunt CRE 2018-FL2, Ltd
Variable Interest Entity [Line Items]
Carrying Value				$ 215,400,000