v3.25.2
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)