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Summary of Securities with Gross Unrealized Losses (Detail) - Fixed Income Securities - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value $ 588,383 $ 148,474
Less than 12 months, Gross Unrealized Losses (1,045) (1,496)
12 months or longer, Fair Value 544,052 834,118
12 months or longer, Gross Unrealized Losses (22,699) (28,383)
Total, Fair Value 1,132,435 982,592
Total, Gross Unrealized Losses (23,744) (29,879)
U.S. Treasuries    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 549,749 55,447
Less than 12 months, Gross Unrealized Losses (719) (342)
12 months or longer, Fair Value 149,715 239,254
12 months or longer, Gross Unrealized Losses (1,866) (3,049)
Total, Fair Value 699,464 294,701
Total, Gross Unrealized Losses (2,585) (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 19,381 26,150
12 months or longer, Gross Unrealized Losses (1,068) (1,176)
Total, Fair Value 19,381 26,150
Total, Gross Unrealized Losses (1,068) (1,176)
Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 6,072 12,432
Less than 12 months, Gross Unrealized Losses (97) (406)
12 months or longer, Fair Value 34,795 39,734
12 months or longer, Gross Unrealized Losses (3,875) (4,069)
Total, Fair Value 40,867 52,166
Total, Gross Unrealized Losses (3,972) (4,475)
Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 19,742 38,828
Less than 12 months, Gross Unrealized Losses (168) (469)
12 months or longer, Fair Value 80,809 108,947
12 months or longer, Gross Unrealized Losses (3,582) (4,622)
Total, Fair Value 100,551 147,775
Total, Gross Unrealized Losses (3,750) (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 70,298 76,467
12 months or longer, Gross Unrealized Losses (4,159) (4,992)
Total, Fair Value 70,298 76,480
Total, Gross Unrealized Losses (4,159) (4,994)
Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 8,827 34,658
Less than 12 months, Gross Unrealized Losses (54) (264)
12 months or longer, Fair Value 128,858 231,816
12 months or longer, Gross Unrealized Losses (5,098) (6,665)
Total, Fair Value 137,685 266,474
Total, Gross Unrealized Losses (5,152) (6,929)
Foreign Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 3,993 7,096
Less than 12 months, Gross Unrealized Losses (7) (13)
12 months or longer, Fair Value 60,196 111,750
12 months or longer, Gross Unrealized Losses (3,051) (3,810)
Total, Fair Value 64,189 118,846
Total, Gross Unrealized Losses $ (3,058) $ (3,823)