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Summary of Securities with Gross Unrealized Losses (Detail) - Fixed Income Securities - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value $ 382,597 $ 148,474
Less than 12 months, Gross Unrealized Losses (1,408) (1,496)
12 months or longer, Fair Value 596,865 834,118
12 months or longer, Gross Unrealized Losses (24,695) (28,383)
Total, Fair Value 979,462 982,592
Total, Gross Unrealized Losses (26,103) (29,879)
U.S. Treasuries    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 301,942 55,447
Less than 12 months, Gross Unrealized Losses (816) (342)
12 months or longer, Fair Value 148,120 239,254
12 months or longer, Gross Unrealized Losses (2,027) (3,049)
Total, Fair Value 450,062 294,701
Total, Gross Unrealized Losses (2,843) (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 20,092 26,150
12 months or longer, Gross Unrealized Losses (1,188) (1,176)
Total, Fair Value 20,092 26,150
Total, Gross Unrealized Losses (1,188) (1,176)
Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 5,770 12,432
Less than 12 months, Gross Unrealized Losses (67) (406)
12 months or longer, Fair Value 37,528 39,734
12 months or longer, Gross Unrealized Losses (4,077) (4,069)
Total, Fair Value 43,298 52,166
Total, Gross Unrealized Losses (4,144) (4,475)
Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 46,385 38,828
Less than 12 months, Gross Unrealized Losses (474) (469)
12 months or longer, Fair Value 84,010 108,947
12 months or longer, Gross Unrealized Losses (3,967) (4,622)
Total, Fair Value 130,395 147,775
Total, Gross Unrealized Losses (4,441) (5,091)
Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 0 13
Less than 12 months, Gross Unrealized Losses 0 (2)
12 months or longer, Fair Value 75,207 76,467
12 months or longer, Gross Unrealized Losses (4,271) (4,992)
Total, Fair Value 75,207 76,480
Total, Gross Unrealized Losses (4,271) (4,994)
Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 23,798 34,658
Less than 12 months, Gross Unrealized Losses (45) (264)
12 months or longer, Fair Value 150,118 231,816
12 months or longer, Gross Unrealized Losses (5,846) (6,665)
Total, Fair Value 173,916 266,474
Total, Gross Unrealized Losses (5,891) (6,929)
Foreign Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 4,702 7,096
Less than 12 months, Gross Unrealized Losses (6) (13)
12 months or longer, Fair Value 81,790 111,750
12 months or longer, Gross Unrealized Losses (3,319) (3,810)
Total, Fair Value 86,492 118,846
Total, Gross Unrealized Losses $ (3,325) $ (3,823)