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v3.25.1

Summary of Securities with Gross Unrealized Losses (Detail) - Fixed Income Securities - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | $ 283,765 | $ 80,491
Less than 12 months, Gross Unrealized Losses | (404) | (923)
12 months or longer, Fair Value | 313,084 | 355,303
12 months or longer, Gross Unrealized Losses | (10,913) | (14,013)
Total, Fair Value | 596,849 | 435,794
Total, Gross Unrealized Losses | (11,317) | (14,936)
U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 212,512 | 12,909
Less than 12 months, Gross Unrealized Losses | (57) | (180)
12 months or longer, Fair Value | 50,659 | 67,662
12 months or longer, Gross Unrealized Losses | (365) | (604)
Total, Fair Value | 263,171 | 80,571
Total, Gross Unrealized Losses | (422) | (784)
Obligations of States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 0 | 0
Less than 12 months, Gross Unrealized Losses | 0 | 0
12 months or longer, Fair Value | 16,484 | 16,335
12 months or longer, Gross Unrealized Losses | (615) | (790)
Total, Fair Value | 16,484 | 16,335
Total, Gross Unrealized Losses | (615) | (790)
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 38,437 | 20,832
Less than 12 months, Gross Unrealized Losses | (228) | (336)
12 months or longer, Fair Value | 23,660 | 26,802
12 months or longer, Gross Unrealized Losses | (2,358) | (2,948)
Total, Fair Value | 62,097 | 47,634
Total, Gross Unrealized Losses | (2,586) | (3,284)
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 11,417 | 7,239
Less than 12 months, Gross Unrealized Losses | (18) | (49)
12 months or longer, Fair Value | 44,887 | 46,792
12 months or longer, Gross Unrealized Losses | (2,328) | (2,833)
Total, Fair Value | 56,304 | 54,031
Total, Gross Unrealized Losses | (2,346) | (2,882)
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 5,918 | 7,551
Less than 12 months, Gross Unrealized Losses | (36) | (242)
12 months or longer, Fair Value | 50,333 | 55,750
12 months or longer, Gross Unrealized Losses | (1,750) | (2,246)
Total, Fair Value | 56,251 | 63,301
Total, Gross Unrealized Losses | (1,786) | (2,488)
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 14,696 | 14,325
Less than 12 months, Gross Unrealized Losses | (23) | (54)
12 months or longer, Fair Value | 83,580 | 95,266
12 months or longer, Gross Unrealized Losses | (2,128) | (2,837)
Total, Fair Value | 98,276 | 109,591
Total, Gross Unrealized Losses | (2,151) | (2,891)
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 785 | 17,635
Less than 12 months, Gross Unrealized Losses | (42) | (62)
12 months or longer, Fair Value | 43,481 | 46,696
12 months or longer, Gross Unrealized Losses | (1,369) | (1,755)
Total, Fair Value | 44,266 | 64,331
Total, Gross Unrealized Losses | $ (1,411) | $ (1,817)

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