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Investments - Cost and Fair Value, Net of Credit Loss Allowance, of Fixed Maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale securities: |  |
Amortized cost | $ 1,061,705 |
Estimated fair value | 1,056,992 |
Held-to-maturity securities: |  |
Amortized cost | 1,066,538 |
Gross unrealized gains | 16,397 |
Gross unrealized losses | 21,110 |
Estimated fair value | 1,061,825 |
Fair value of loaned securities | 8,135 | $ 0
Corporate debt securities |  |
Available-for-sale securities: |  |
Amortized cost | 643,288 | 600,639
Gross unrealized gains | 11,730 | 4,594
Gross unrealized losses | 6,505 | 16,545
Estimated fair value | 648,513 | 588,688
Collateralized debt obligations |  |
Available-for-sale securities: |  |
Amortized cost | 110,641 | 114,400
Gross unrealized gains | 247 | 156
Gross unrealized losses | 616 | 2,088
Estimated fair value | 110,272 | 112,468
Commercial mortgage-backed securities |  |
Available-for-sale securities: |  |
Amortized cost | 136,370 | 106,019
Gross unrealized gains | 3,555 | 1,410
Gross unrealized losses | 2,570 | 4,709
Estimated fair value | 137,355 | 102,720
Residential mortgage- backed securities |  |
Available-for-sale securities: |  |
Amortized cost | 145,864 | 153,633
Gross unrealized gains | 292 | 69
Gross unrealized losses | 10,981 | 13,647
Estimated fair value | 135,175 | 140,055
Other debt securities |  |
Available-for-sale securities: |  |
Amortized cost | 25,542 | 17,862
Gross unrealized gains | 573 | 136
Gross unrealized losses | 438 | 688
Estimated fair value | 25,677 | 17,310
Total available-for-sale securities |  |
Available-for-sale securities: |  |
Amortized cost | 1,061,705 | 992,553
Gross unrealized gains | 16,397 | 6,365
Gross unrealized losses | 21,110 | 37,677
Estimated fair value | 1,056,992 | $ 961,241
Held-to-maturity securities |  |
Held-to-maturity securities: |  |
Amortized cost | 4,833 |
Gross unrealized gains | 0 |
Gross unrealized losses | 0 |
Estimated fair value | $ 4,833 |

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