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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 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale securities, Amortized cost |  |
Due in one year or less | $ 49,077 |
Due after one year through five years | 453,677 |
Due after five years through ten years | 186,695 |
Due after ten years | 372,256 |
Amortized cost | 1,061,705 |
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 | 48,447 |
Due after one year through five years | 456,863 |
Due after five years through ten years | 188,732 |
Due after ten years | 362,950 |
Estimated fair value | 1,056,992 |
Held-to-maturity securities, Estimated fair value |  |
Held-to-maturity securities - due after ten years | 4,833 |
Amortized cost | 1,066,538 |
Estimated fair value | 1,061,825 |
Fair value of loaned securities | $ 8,135 | $ 0

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