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Investments - Summary of Realized Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Investments [Abstract] |  |  |  |
Gains | $ 43 | $ 4 | $ 196 | $ 19
Losses | (41) | 0 | (178) | (2)
Realized investment gains, net | 2 | 4 | 18 | 17
Fixed Maturities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Gains | 43 | 4 | 196 | 19
Losses | (41) | 0 | (178) | (2)
Realized investment gains, net | 2 | 4 | 18 | 17
Equity Securities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Gains | 0 | 0 | 0 | 0
Losses | 0 | 0 | 0 | 0
Realized investment gains, net | 0 | 0 | 0 | 0
Other Invested Assets [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Gains | 0 | 0 | 0 | 0
Losses | 0 | 0 | 0 | 0
Realized investment gains, net | $ 0 | $ 0 | $ 0 | $ 0

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