COMMERCIAL MORTGAGE LOANS HELD-FOR-INVESTMENT - Summary of Commercial Mortgage Loans (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) mortgage_loan		Dec. 31, 2020 USD ($) mortgage_loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
One Month LIBOR Rate	$ 0.0011		$ 0.0014
Weighted Average LIBOR Floor Rate	0.0154		0.0164
Commercial mortgage loans held-for-investment, at amortized cost	484,165,249	[1]	547,345,334
Commercial real estate portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	484,165,249		547,345,334
Carrying Value	$ 484,165,249		$ 547,345,334
Loan Count | mortgage_loan	34		40
Weighted average, floating rate loan, percentage	100.00%		100.00%
Weighted average coupon rate, percentage	5.10%		5.10%
Weighted average, life (in years)	2 years 10 months 24 days		3 years 1 month 6 days
Commercial mortgage loans held-for-investment, at amortized cost	$ 484,165,249		$ 547,345,334
Outstanding senior secured loans from loan participations	15,219,494		15,981,933
Hunt CMT | Commercial real estate portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial mortgage loans held-for-investment, at amortized cost	$ 468,945,755		$ 531,363,401

[1] Our consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company was the primary beneficiary of these VIEs. As of March 31, 2021 and December 31, 2020, assets of consolidated VIEs related to Hunt CRE 2017-F1, Ltd. and Hunt CRE 2018-FL2, Ltd. totaled $537,399,673 and $591,318,506, respectively and the liabilities of consolidated VIEs related to Hunt CRE 2017-FL1, Ltd. and Hunt CRE 2018-FL2, Ltd totaled $409,716,943 and $463,411,967 respectively. See Note 4 for further discussion.