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Investments - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investment income | $ 13,714,000 | $ 12,755,000 | $ 11,282,000 | $ 10,698,000 | $ 10,448,000 | $ 6,074,000 | $ 5,221,000 | $ 4,042,000 | $ 48,449,000 | $ 25,785,000 | $ 12,535,000
Net cumulative contribution capital | $ 4,800,000 |  |  |  | $ 0 |  |  |  | 4,800,000 | $ 0 |
Other investments, at fair value (cost: $4,794 and $0) |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | $ 5,600,000 |  |

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