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Summary of Securities with Gross Unrealized Losses (Detail) - Fixed Income Securities - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | $ 272,596 | $ 80,491
Less than 12 months, Gross Unrealized Losses | (447) | (923)
12 months or longer, Fair Value | 251,863 | 355,303
12 months or longer, Gross Unrealized Losses | (9,132) | (14,013)
Total, Fair Value | 524,459 | 435,794
Total, Gross Unrealized Losses | (9,579) | (14,936)
U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 219,690 | 12,909
Less than 12 months, Gross Unrealized Losses | (30) | (180)
12 months or longer, Fair Value | 24,367 | 67,662
12 months or longer, Gross Unrealized Losses | (235) | (604)
Total, Fair Value | 244,057 | 80,571
Total, Gross Unrealized Losses | (265) | (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 | 15,434 | 16,335
12 months or longer, Gross Unrealized Losses | (489) | (790)
Total, Fair Value | 15,434 | 16,335
Total, Gross Unrealized Losses | (489) | (790)
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 15,828 | 20,832
Less than 12 months, Gross Unrealized Losses | (213) | (336)
12 months or longer, Fair Value | 22,595 | 26,802
12 months or longer, Gross Unrealized Losses | (2,287) | (2,948)
Total, Fair Value | 38,423 | 47,634
Total, Gross Unrealized Losses | (2,500) | (3,284)
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 26,815 | 7,239
Less than 12 months, Gross Unrealized Losses | (107) | (49)
12 months or longer, Fair Value | 43,088 | 46,792
12 months or longer, Gross Unrealized Losses | (2,059) | (2,833)
Total, Fair Value | 69,903 | 54,031
Total, Gross Unrealized Losses | (2,166) | (2,882)
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 4,934 | 7,551
Less than 12 months, Gross Unrealized Losses | (50) | (242)
12 months or longer, Fair Value | 44,422 | 55,750
12 months or longer, Gross Unrealized Losses | (1,523) | (2,246)
Total, Fair Value | 49,356 | 63,301
Total, Gross Unrealized Losses | (1,573) | (2,488)
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 4,543 | 14,325
Less than 12 months, Gross Unrealized Losses | (7) | (54)
12 months or longer, Fair Value | 66,229 | 95,266
12 months or longer, Gross Unrealized Losses | (1,540) | (2,837)
Total, Fair Value | 70,772 | 109,591
Total, Gross Unrealized Losses | (1,547) | (2,891)
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 786 | 17,635
Less than 12 months, Gross Unrealized Losses | (40) | (62)
12 months or longer, Fair Value | 35,728 | 46,696
12 months or longer, Gross Unrealized Losses | (999) | (1,755)
Total, Fair Value | 36,514 | 64,331
Total, Gross Unrealized Losses | $ (1,039) | $ (1,817)

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