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Summary of Securities with Gross Unrealized Losses (Detail) - Fixed Income Securities - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value $ 35,766 $ 148,474
Less than 12 months, Gross Unrealized Losses (198) (1,496)
12 months or longer, Fair Value 386,934 834,118
12 months or longer, Gross Unrealized Losses (13,274) (28,383)
Total, Fair Value 422,700 982,592
Total, Gross Unrealized Losses (13,472) (29,879)
U.S. Treasuries    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 18,829 55,447
Less than 12 months, Gross Unrealized Losses (4) (342)
12 months or longer, Fair Value 67,499 239,254
12 months or longer, Gross Unrealized Losses (679) (3,049)
Total, Fair Value 86,328 294,701
Total, Gross Unrealized Losses (683) (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 17,173 26,150
12 months or longer, Gross Unrealized Losses (634) (1,176)
Total, Fair Value 17,173 26,150
Total, Gross Unrealized Losses (634) (1,176)
Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 6,235 12,432
Less than 12 months, Gross Unrealized Losses (127) (406)
12 months or longer, Fair Value 24,167 39,734
12 months or longer, Gross Unrealized Losses (2,311) (4,069)
Total, Fair Value 30,402 52,166
Total, Gross Unrealized Losses (2,438) (4,475)
Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 4,130 38,828
Less than 12 months, Gross Unrealized Losses (49) (469)
12 months or longer, Fair Value 56,171 108,947
12 months or longer, Gross Unrealized Losses (2,761) (4,622)
Total, Fair Value 60,301 147,775
Total, Gross Unrealized Losses (2,810) (5,091)
Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 9 13
Less than 12 months, Gross Unrealized Losses 0 (2)
12 months or longer, Fair Value 65,051 76,467
12 months or longer, Gross Unrealized Losses (2,526) (4,992)
Total, Fair Value 65,060 76,480
Total, Gross Unrealized Losses (2,526) (4,994)
Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 6,043 34,658
Less than 12 months, Gross Unrealized Losses (11) (264)
12 months or longer, Fair Value 106,762 231,816
12 months or longer, Gross Unrealized Losses (2,766) (6,665)
Total, Fair Value 112,805 266,474
Total, Gross Unrealized Losses (2,777) (6,929)
Foreign Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 520 7,096
Less than 12 months, Gross Unrealized Losses (7) (13)
12 months or longer, Fair Value 50,111 111,750
12 months or longer, Gross Unrealized Losses (1,597) (3,810)
Total, Fair Value 50,631 118,846
Total, Gross Unrealized Losses $ (1,604) $ (3,823)