USE OF SPECIAL PURPOSE ENTITIES AND VARIABLE INTEREST ENTITIES - Summary of Loan and Borrowing Characteristics (Details)		9 Months Ended	12 Months Ended
		Sep. 30, 2022 USD ($) contract mortgage_loan instrument	Dec. 31, 2021 USD ($) contract mortgage_loan instrument
Variable Interest Entity [Line Items]
Carrying Value		$ 1,044,080,754
Collateralized loan obligations	[1]	$ 828,673,313	$ 826,782,543
One month LIBOR rate (as a percent)		2.66%	0.10%
One month SOFR rate ( as a percent)		2.60%	0.00%
Weighted average LIBOR floor rate (as a percent)		0.26%	0.49%
SOFR spread rate (as a percent)		3.36%	3.42%
Financing receivable, floating Rate (as a percent)		86.50%	100.00%
Floating rate indexed to one-month (as a percent)		13.50%
LOBR, spread rate (as a percent)		1.43%	1.43%
London Interbank Offered Rate (LIBOR)
Variable Interest Entity [Line Items]
One month LIBOR rate (as a percent)		2.82%	0.11%
Commercial Real Estate Portfolio Segment
Variable Interest Entity [Line Items]
Collateral (loan investments) (Count) | mortgage_loan		70	66
Carrying Value		$ 1,045,953,691	$ 1,001,825,294
Financing receivable, floating Rate (as a percent)		100.00%	100.00%
LFT CRE 2021-FL1, Ltd.
Variable Interest Entity [Line Items]
Financings provided, (Count) | instrument		1	1
Collateralized loan obligations		$ 828,673,313	$ 826,782,543
LFT CRE 2021-FL1, Ltd. | London Interbank Offered Rate (LIBOR)
Variable Interest Entity [Line Items]
Wtd. Avg. Coupon(2)		6.01%	3.93%
Wtd. Avg. Coupon(2)		4.25%	1.54%
LFT CRE 2021-FL1, Ltd. | Commercial Real Estate Portfolio Segment
Variable Interest Entity [Line Items]
Collateral (loan investments) (Count) | contract		64	64
Principal Value | LFT CRE 2021-FL1, Ltd.
Variable Interest Entity [Line Items]
Carrying Value		$ 971,881,150	$ 974,069,994
Collateralized loan obligations		833,750,000	833,750,000
Carrying Value | LFT CRE 2021-FL1, Ltd.
Variable Interest Entity [Line Items]
Carrying Value		971,905,743	974,025,294
Collateralized loan obligations		828,673,313	826,782,543
Debt issuance costs		$ 5,076,687	$ 6,967,457

[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, 2022 and December 31, 2021, assets of consolidated VIEs totaled $1,004,040,687 and $1,003,896,995, respectively and the liabilities of consolidated VIEs totaled $830,248,911 and $827,390,435 respectively. See Note 4 for further discussion.