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Summary of Securities with Gross Unrealized Losses (Detail) - Fixed Income Securities - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value $ 52,225 $ 80,491
Less than 12 months, Gross Unrealized Losses (2,891) (923)
12 months or longer, Fair Value 201,692 355,303
12 months or longer, Gross Unrealized Losses (7,861) (14,013)
Total, Fair Value 253,917 435,794
Total, Gross Unrealized Losses (10,752) (14,936)
U.S. Treasuries    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 8,513 12,909
Less than 12 months, Gross Unrealized Losses (8) (180)
12 months or longer, Fair Value 7,595 67,662
12 months or longer, Gross Unrealized Losses (166) (604)
Total, Fair Value 16,108 80,571
Total, Gross Unrealized Losses (174) (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 14,150 16,335
12 months or longer, Gross Unrealized Losses (390) (790)
Total, Fair Value 14,150 16,335
Total, Gross Unrealized Losses (390) (790)
Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 19,003 20,832
Less than 12 months, Gross Unrealized Losses (1,236) (336)
12 months or longer, Fair Value 21,389 26,802
12 months or longer, Gross Unrealized Losses (2,176) (2,948)
Total, Fair Value 40,392 47,634
Total, Gross Unrealized Losses (3,412) (3,284)
Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 20,309 7,239
Less than 12 months, Gross Unrealized Losses (1,599) (49)
12 months or longer, Fair Value 35,472 46,792
12 months or longer, Gross Unrealized Losses (2,017) (2,833)
Total, Fair Value 55,781 54,031
Total, Gross Unrealized Losses (3,616) (2,882)
Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 3,162 7,551
Less than 12 months, Gross Unrealized Losses (42) (242)
12 months or longer, Fair Value 37,607 55,750
12 months or longer, Gross Unrealized Losses (1,301) (2,246)
Total, Fair Value 40,769 63,301
Total, Gross Unrealized Losses (1,343) (2,488)
Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 443 14,325
Less than 12 months, Gross Unrealized Losses (2) (54)
12 months or longer, Fair Value 56,893 95,266
12 months or longer, Gross Unrealized Losses (1,097) (2,837)
Total, Fair Value 57,336 109,591
Total, Gross Unrealized Losses (1,099) (2,891)
Foreign Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 795 17,635
Less than 12 months, Gross Unrealized Losses (4) (62)
12 months or longer, Fair Value 28,586 46,696
12 months or longer, Gross Unrealized Losses (714) (1,755)
Total, Fair Value 29,381 64,331
Total, Gross Unrealized Losses $ (718) $ (1,817)