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Summary of Securities with Gross Unrealized Losses (Detail) - Fixed Income Securities - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value $ 80,491 $ 148,474
Less than 12 months, Gross Unrealized Losses (923) (1,496)
12 months or longer, Fair Value 355,303 834,118
12 months or longer, Gross Unrealized Losses (14,013) (28,383)
Total, Fair Value 435,794 982,592
Total, Gross Unrealized Losses (14,936) (29,879)
U.S. Treasuries    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 12,909 55,447
Less than 12 months, Gross Unrealized Losses (180) (342)
12 months or longer, Fair Value 67,662 239,254
12 months or longer, Gross Unrealized Losses (604) (3,049)
Total, Fair Value 80,571 294,701
Total, Gross Unrealized Losses (784) (3,391)
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 16,335 26,150
12 months or longer, Gross Unrealized Losses (790) (1,176)
Total, Fair Value 16,335 26,150
Total, Gross Unrealized Losses (790) (1,176)
Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 20,832 12,432
Less than 12 months, Gross Unrealized Losses (336) (406)
12 months or longer, Fair Value 26,802 39,734
12 months or longer, Gross Unrealized Losses (2,948) (4,069)
Total, Fair Value 47,634 52,166
Total, Gross Unrealized Losses (3,284) (4,475)
Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 7,239 38,828
Less than 12 months, Gross Unrealized Losses (49) (469)
12 months or longer, Fair Value 46,792 108,947
12 months or longer, Gross Unrealized Losses (2,833) (4,622)
Total, Fair Value 54,031 147,775
Total, Gross Unrealized Losses (2,882) (5,091)
Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 7,551 13
Less than 12 months, Gross Unrealized Losses (242) (2)
12 months or longer, Fair Value 55,750 76,467
12 months or longer, Gross Unrealized Losses (2,246) (4,992)
Total, Fair Value 63,301 76,480
Total, Gross Unrealized Losses (2,488) (4,994)
Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 14,325 34,658
Less than 12 months, Gross Unrealized Losses (54) (264)
12 months or longer, Fair Value 95,266 231,816
12 months or longer, Gross Unrealized Losses (2,837) (6,665)
Total, Fair Value 109,591 266,474
Total, Gross Unrealized Losses (2,891) (6,929)
Foreign Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 17,635 7,096
Less than 12 months, Gross Unrealized Losses (62) (13)
12 months or longer, Fair Value 46,696 111,750
12 months or longer, Gross Unrealized Losses (1,755) (3,810)
Total, Fair Value 64,331 118,846
Total, Gross Unrealized Losses $ (1,817) $ (3,823)