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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 | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale securities, Amortized cost |  |
Due in one year or less | $ 57,341 |
Due after one year through five years | 478,964 |
Due after five years through ten years | 177,290 |
Due after ten years | 419,663 |
Amortized cost | 1,133,258 |
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 | 56,820 |
Due after one year through five years | 482,703 |
Due after five years through ten years | 178,639 |
Due after ten years | 407,986 |
Estimated fair value | 1,126,148 |
Held-to-maturity securities, Estimated fair value |  |
Held-to-maturity securities - due after ten years | 4,830 |
Amortized cost | 1,138,091 | $ 1,070,789
Estimated fair value | 1,130,978 | $ 1,048,549
Fair value of securities lent | $ 35,500 |

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