COMMERCIAL MORTGAGE LOANS HELD-FOR-INVESTMENT - Loan Portfolio Activity (Details) - USD ($)		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Loans Receivable Held-For-Investment, Net, Reconciliation To Cash Flow [Roll Forward]
Balance at December 31, 2019		$ 635,260,420
Purchases and fundings		52,580,443	$ 179,075,497
Proceeds from principal payments		(88,907,741)	$ (174,726,836)
Balance at September 30, 2020	[1]	598,933,122
Commercial real estate portfolio segment
Loans Receivable Held-For-Investment, Net, Reconciliation To Cash Flow [Roll Forward]
Balance at December 31, 2019		635,260,420
Purchases and fundings		52,580,443
Proceeds from principal payments		(88,907,741)
Balance at September 30, 2020		$ 598,933,122

[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 September 30, 2020 and December 31, 2019, assets of consolidated VIEs related to Hunt CRE 2017-F1, Ltd. and Hunt CRE 2018-FL2, Ltd. totaled $608,690,756 and $636,541,489, respectively and the liabilities of consolidated VIEs related to Hunt CRE 2017-FL1, Ltd. and Hunt CRE 2018-FL2, Ltd totaled $480,043,366 and $506,662,238 respectively. See Note 5 for further discussion.