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Summary of Securities with Gross Unrealized Losses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
U.S. Treasuries    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses $ (7,701)  
Obligations of States and Political Subdivisions    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses (1,666)  
Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses (4,816)  
Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses (7,966)  
Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses (5,880)  
Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses (12,038)  
Foreign Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses (6,641)  
Fixed Income Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 413,333 $ 992,284
Less than 12 months, Gross Unrealized Losses (8,168) (34,755)
12 months or longer, Fair Value 696,260 212,980
12 months or longer, Gross Unrealized Losses (38,540) (19,361)
Total, Fair Value 1,109,593 1,205,264
Total, Gross Unrealized Losses (46,708) (54,116)
Fixed Income Securities | U.S. Treasuries    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 198,477 335,781
Less than 12 months, Gross Unrealized Losses (3,953) (7,518)
12 months or longer, Fair Value 120,678 8,322
12 months or longer, Gross Unrealized Losses (3,748) (912)
Total, Fair Value 319,155 344,103
Total, Gross Unrealized Losses (7,701) (8,430)
Fixed Income Securities | Obligations of States and Political Subdivisions    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 7,810 27,772
Less than 12 months, Gross Unrealized Losses (222) (1,378)
12 months or longer, Fair Value 19,795 3,778
12 months or longer, Gross Unrealized Losses (1,444) (498)
Total, Fair Value 27,605 31,550
Total, Gross Unrealized Losses (1,666) (1,876)
Fixed Income Securities | Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 16,354 51,517
Less than 12 months, Gross Unrealized Losses (707) (4,228)
12 months or longer, Fair Value 33,913 7,860
12 months or longer, Gross Unrealized Losses (4,109) (1,381)
Total, Fair Value 50,267 59,377
Total, Gross Unrealized Losses (4,816) (5,609)
Fixed Income Securities | Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 91,904 97,857
Less than 12 months, Gross Unrealized Losses (1,888) (3,610)
12 months or longer, Fair Value 95,269 62,689
12 months or longer, Gross Unrealized Losses (6,078) (5,541)
Total, Fair Value 187,173 160,546
Total, Gross Unrealized Losses (7,966) (9,151)
Fixed Income Securities | Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 1,678 67,926
Less than 12 months, Gross Unrealized Losses (69) (4,072)
12 months or longer, Fair Value 76,056 27,907
12 months or longer, Gross Unrealized Losses (5,811) (2,061)
Total, Fair Value 77,734 95,833
Total, Gross Unrealized Losses (5,880) (6,133)
Fixed Income Securities | Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 74,010 261,123
Less than 12 months, Gross Unrealized Losses (1,175) (8,480)
12 months or longer, Fair Value 230,601 71,192
12 months or longer, Gross Unrealized Losses (10,863) (6,378)
Total, Fair Value 304,611 332,315
Total, Gross Unrealized Losses (12,038) (14,858)
Fixed Income Securities | Foreign Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 23,100 150,308
Less than 12 months, Gross Unrealized Losses (154) (5,469)
12 months or longer, Fair Value 119,948 31,232
12 months or longer, Gross Unrealized Losses (6,487) (2,590)
Total, Fair Value 143,048 181,540
Total, Gross Unrealized Losses $ (6,641) $ (8,059)