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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Schedule of Investment Income | A presentation of total investment income MSC Income earned from its Investment Portfolio in each of the periods presented is as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
| (dollars in thousands)
Interest, dividend and fee income: |  |  |  |  |  |  |
Interest income | $ | 30,117 |  |  | $ | 30,236 |  |  | $ | 86,890 |  |  | $ | 88,154 |
Dividend income | 3,652 |  |  | 2,485 |  |  | 13,750 |  |  | 8,964 |
Fee income | 1,598 |  |  | 756 |  |  | 3,597 |  |  | 4,255 |
Total investment income | $ | 35,367 |  |  | $ | 33,477 |  |  | $ | 104,237 |  |  | $ | 101,373 |

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