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Investments - Analysis of Securities in Unrealized Loss Positions (Details) $ in Thousands | Sep. 30, 2025 USD ($) Security | Dec. 31, 2024 USD ($) Security
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Investments [Abstract] |  |
Number of securities in unrealized loss position (in Security) | Security | 193 | 213
Allowance for expected credit losses on available-for-sale fixed maturities | $ | $ 0 | $ 0

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