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USE OF SPECIAL PURPOSE ENTITIES AND VARIABLE INTEREST ENTITIES - Narrative (Details)	Dec. 10, 2025 USD ($) tranche	Jul. 12, 2023 USD ($)	Jun. 14, 2021 USD ($) tranche subsidiary	Mar. 31, 2026 USD ($)	Feb. 20, 2026 USD ($)	Dec. 31, 2025 USD ($)
Variable Interest Entity [Line Items]
Number of wholly-owned subsidiaries | subsidiary			2
Equity interest retained	$ 43,100,000		$ 96,250,000
Proceeds from issuance of long-term debt allocated to acquire additional loan obligations	$ 5,800,000		$ 330,300,000
Period to acquire additional loan obligations from closing date	180 days		180 days
Collateralized loan obligation leverage ratio (as a percent)	0.88		0.83
Debt, weighted average interest rate	1.905%	3.14%
Debt weighted average, excluding fees and transaction costs, term		30 days
Commercial Real Estate Portfolio Segment
Variable Interest Entity [Line Items]
Face amount				$ 1,130,899,067		$ 1,140,268,217
LMF 2023-1 Financing | Internal Investment Grade
Variable Interest Entity [Line Items]
Face amount		$ 47,300,000
LMF 2023-1 Financing | Internal Investment Grade | Private Placement
Variable Interest Entity [Line Items]
Face amount		270,400,000
LMF 2023-1 Financing | Multifamily | Commercial Real Estate Portfolio Segment | Internal Investment Grade
Variable Interest Entity [Line Items]
Face amount		386,400,000
Lument Finance Trust
Variable Interest Entity [Line Items]
Retained subordinated interests		$ 68,600,000
Financing initial reinvestment period		2 years
LMF 2023-1
Variable Interest Entity [Line Items]
Deferred financing costs					$ 1,200,000
Collateralized Loan Obligations - LFT CRE 2021-FL1, Ltd.
Variable Interest Entity [Line Items]
Number of tranches of CLO notes issued | tranche			8
Aggregate principal of CLO notes			$ 903,800,000
Initial investment period			2 years 6 months
Proceeds from issuance of collateralized loan obligations			$ 1,000,000,000.0
Collateralized Loan Obligations - LFT CRE 2021-FL1, Ltd. - Investment Grade
Variable Interest Entity [Line Items]
Aggregate principal of CLO notes			833,800,000
Collateralized Loan Obligations - LFT CRE 2021-FL1, Ltd. - Below Investment Grade
Variable Interest Entity [Line Items]
Aggregate principal of CLO notes			$ 70,000,000
Collateralized Loan Obligations - 2025-FL3
Variable Interest Entity [Line Items]
Number of tranches of CLO notes issued | tranche	8
Aggregate principal of CLO notes	$ 620,700,000
Proceeds from issuance of collateralized loan obligations	663,800,000
Collateralized Loan Obligations - LMNT 2025-FL3, Ltd. - Below Investment Grade
Variable Interest Entity [Line Items]
Aggregate principal of CLO notes	35,700,000
Collateralized Loan Obligations - LFT CRE 2025-FL3, Ltd. - Investment Grade
Variable Interest Entity [Line Items]
Aggregate principal of CLO notes	$ 585,000,000.0

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