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Investments - Amortized Cost and Estimated Fair Value, Net of Credit Loss Allowance, of Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale securities, Amortized cost |  |
Due in one year or less | $ 53,577 |
Due after one year through five years | 479,358 |
Due after five years through ten years | 187,422 |
Due after ten years | 407,384 |
Amortized cost | 1,127,741 |
Held-to-maturity securities, Amortized cost |  |
Held-to-maturity securities - due after ten years | 4,833 |
Available-for-sale securities, Estimated fair value |  |
Due in one year or less | 52,860 |
Due after one year through five years | 479,252 |
Due after five years through ten years | 187,375 |
Due after ten years | 393,220 |
Estimated fair value | 1,112,707 |
Held-to-maturity securities, Estimated fair value |  |
Held-to-maturity securities - due after ten years | 4,902 |
Amortized cost | 1,132,574 | $ 1,070,789
Estimated fair value | 1,117,609 | $ 1,048,549
Fair value of securities lent | $ 12,300 |

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