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Investments - Cost and Fair Value, Net of Credit Loss Allowance, of Fixed Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale securities: |  |
Amortized cost | $ 1,127,741 |
Estimated fair value | 1,112,707 |
Held-to-maturity securities: |  |
Amortized cost | 1,132,574 | $ 1,070,789
Gross unrealized gains | 9,133 | 6,907
Gross unrealized losses | 24,098 | 29,147
Estimated fair value | 1,117,609 | 1,048,549
Fair value of securities lent | 12,300 |
Corporate debt securities |  |
Available-for-sale securities: |  |
Amortized cost | 696,519 | 647,861
Gross unrealized gains | 6,111 | 4,767
Gross unrealized losses | 7,298 | 8,685
Estimated fair value | 695,332 | 643,943
Held-to-maturity securities: |  |
Fair value of securities lent | 12,200 | 7,300
Collateralized debt obligations |  |
Available-for-sale securities: |  |
Amortized cost | 107,667 | 114,142
Gross unrealized gains | 191 | 372
Gross unrealized losses | 393 | 387
Estimated fair value | 107,465 | 114,127
Commercial mortgage-backed securities |  |
Available-for-sale securities: |  |
Amortized cost | 120,342 | 126,509
Gross unrealized gains | 1,930 | 1,458
Gross unrealized losses | 2,246 | 2,985
Estimated fair value | 120,026 | 124,982
Residential mortgage-backed securities |  |
Available-for-sale securities: |  |
Amortized cost | 157,872 | 150,212
Gross unrealized gains | 310 | 62
Gross unrealized losses | 13,703 | 16,462
Estimated fair value | 144,479 | 133,812
Other debt securities |  |
Available-for-sale securities: |  |
Amortized cost | 36,362 | 27,232
Gross unrealized gains | 366 | 147
Gross unrealized losses | 458 | 628
Estimated fair value | 36,270 | 26,751
U.S. Treasury |  |
Available-for-sale securities: |  |
Amortized cost | 8,979 |
Gross unrealized gains | 156 |
Gross unrealized losses | 0 |
Estimated fair value | 9,135 |
Total available-for-sale securities |  |
Available-for-sale securities: |  |
Amortized cost | 1,127,741 | 1,065,956
Gross unrealized gains | 9,064 | 6,806
Gross unrealized losses | 24,098 | 29,147
Estimated fair value | 1,112,707 | 1,043,615
Held-to-maturity securities |  |
Held-to-maturity securities: |  |
Amortized cost | 4,833 | 4,833
Gross unrealized gains | 69 | 101
Gross unrealized losses | 0 | 0
Estimated fair value | $ 4,902 | $ 4,934

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