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v3.25.3

Investments - Cost and Fair Value, Net of Credit Loss Allowance, of Fixed Maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale securities: |  |
Amortized cost | $ 1,065,216 |
Estimated fair value | 1,065,833 |
Held-to-maturity securities: |  |
Amortized cost | 1,070,049 | $ 1,070,789
Gross unrealized gains | 17,341 | 6,907
Gross unrealized losses | 16,681 | 29,147
Estimated fair value | 1,070,709 | 1,048,549
Fair value of securities lent | 56,200 |
Corporate debt securities |  |
Available-for-sale securities: |  |
Amortized cost | 663,602 | 647,861
Gross unrealized gains | 12,714 | 4,767
Gross unrealized losses | 3,230 | 8,685
Estimated fair value | 673,086 | 643,943
Held-to-maturity securities: |  |
Fair value of securities lent |  | 7,300
Collateralized debt obligations |  |
Available-for-sale securities: |  |
Amortized cost | 90,481 | 114,142
Gross unrealized gains | 238 | 372
Gross unrealized losses | 168 | 387
Estimated fair value | 90,551 | 114,127
Commercial mortgage-backed securities |  |
Available-for-sale securities: |  |
Amortized cost | 121,053 | 126,509
Gross unrealized gains | 2,868 | 1,458
Gross unrealized losses | 1,710 | 2,985
Estimated fair value | 122,211 | 124,982
Residential mortgage-backed securities |  |
Available-for-sale securities: |  |
Amortized cost | 151,730 | 150,212
Gross unrealized gains | 736 | 62
Gross unrealized losses | 11,300 | 16,462
Estimated fair value | 141,166 | 133,812
Other debt securities |  |
Available-for-sale securities: |  |
Amortized cost | 31,091 | 27,232
Gross unrealized gains | 622 | 147
Gross unrealized losses | 264 | 628
Estimated fair value | 31,449 | 26,751
U.S. Treasury |  |
Available-for-sale securities: |  |
Amortized cost | 7,259 |
Gross unrealized gains | 120 |
Gross unrealized losses | 9 |
Estimated fair value | 7,370 |
Total available-for-sale securities |  |
Available-for-sale securities: |  |
Amortized cost | 1,065,216 | 1,065,956
Gross unrealized gains | 17,298 | 6,806
Gross unrealized losses | 16,681 | 29,147
Estimated fair value | 1,065,833 | 1,043,615
Held-to-maturity securities: |  |
Fair value of securities lent | 35,900 |
Held-to-maturity securities |  |
Held-to-maturity securities: |  |
Amortized cost | 4,833 | 4,833
Gross unrealized gains | 43 | 101
Gross unrealized losses | 0 | 0
Estimated fair value | $ 4,876 | $ 4,934

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