USE OF SPECIAL PURPOSE ENTITIES AND VARIABLE INTEREST ENTITIES - Condensed Consolidated Balance Sheets (Details) - USD ($)		Sep. 30, 2021		Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Cash, cash equivalents and restricted cash		$ 192,146,567		$ 69,375,356	$ 24,269,054	$ 16,011,830
Accrued interest receivable	[1]	3,082,676		2,015,617
Investment related receivable	[1]	48,890,010		0
Loans held for investment		803,074,256	[1]	547,345,334
Total Assets	[1]	1,050,018,047		621,489,779
Accrued interest payable	[1]	649,046		432,936
Collateralized loan obligations	[1]	826,145,358		463,060,090
Total Liabilities	[1]	880,856,505		507,786,627
Equity	[1]	169,062,042		113,603,652
Total liabilities and equity	[1]	1,050,018,047		621,489,779
LFT CRE 2021-FL1, Ltd.
Variable Interest Entity [Line Items]
Cash, cash equivalents and restricted cash		148,066,240
Accrued interest receivable		3,082,676
Investment related receivable		48,890,010
Loans held for investment		803,074,256
Total Assets		1,003,113,182
Accrued interest payable		562,499
Collateralized loan obligations		826,145,358
Total Liabilities		826,707,857
Equity		176,405,325
Total liabilities and equity		1,003,113,182
Hunt CRE 2017-FL1, Ltd. and Hunt CRE 2018-FL2, Ltd.
Variable Interest Entity [Line Items]
Cash, cash equivalents and restricted cash				57,999,396
Accrued interest receivable				1,955,709
Investment related receivable				0
Loans held for investment				531,363,401
Total Assets		1,003,113,182		591,318,506
Accrued interest payable				351,877
Collateralized loan obligations				463,060,090
Total Liabilities		$ 826,707,857		463,411,967
Equity				127,906,539
Total liabilities and equity				$ 591,318,506

[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, 2021 and December 31, 2020, assets of consolidated VIEs totaled $1,003,113,182 and $591,318,506, respectively and the liabilities of consolidated VIEs totaled $826,707,857 and $463,411,967 respectively. See Note 4 for further discussion.