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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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