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INVESTMENTS - Unrealized Gain and Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Change in net unrealized investment gain (loss) |  |  |
Available-for-sale fixed maturities | $ 59,466 | $ (6,675) | $ 27,091
Income tax effect | (12,493) | 1,402 | (5,689)
Total change in net unrealized investment gain (loss), net of tax | 46,973 | (5,273) | 21,402
Change in net unrealized gains and losses | 46,973 | $ (5,273) | $ 21,402
Lloyd's Sndicate Investments |  |  |
Change in net unrealized investment gain (loss) |  |  |
Total change in net unrealized investment gain (loss), net of tax | 100 |  |
Change in net unrealized gains and losses | $ 100 |  |

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