XML 56 R46.htm IDEA: XBRL DOCUMENT v3.23.3
Summary of Securities with Gross Unrealized Losses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
U.S. Treasuries    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses $ (6,671)  
Obligations of States and Political Subdivisions    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses (1,760)  
Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses (7,487)  
Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses (7,124)  
Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses (6,628)  
Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses (11,351)  
Foreign Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Total, Gross Unrealized Losses (6,236)  
Fixed Income Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 274,238 $ 992,284
Less than 12 months, Gross Unrealized Losses (4,683) (34,755)
12 months or longer, Fair Value 861,180 212,980
12 months or longer, Gross Unrealized Losses (42,574) (19,361)
Total, Fair Value 1,135,418 1,205,264
Total, Gross Unrealized Losses (47,257) (54,116)
Fixed Income Securities | U.S. Treasuries    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 97,951 335,781
Less than 12 months, Gross Unrealized Losses (1,146) (7,518)
12 months or longer, Fair Value 252,138 8,322
12 months or longer, Gross Unrealized Losses (5,525) (912)
Total, Fair Value 350,089 344,103
Total, Gross Unrealized Losses (6,671) (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 0 27,772
Less than 12 months, Gross Unrealized Losses 0 (1,378)
12 months or longer, Fair Value 26,215 3,778
12 months or longer, Gross Unrealized Losses (1,760) (498)
Total, Fair Value 26,215 31,550
Total, Gross Unrealized Losses (1,760) (1,876)
Fixed Income Securities | Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 22,425 51,517
Less than 12 months, Gross Unrealized Losses (1,738) (4,228)
12 months or longer, Fair Value 35,093 7,860
12 months or longer, Gross Unrealized Losses (5,749) (1,381)
Total, Fair Value 57,518 59,377
Total, Gross Unrealized Losses (7,487) (5,609)
Fixed Income Securities | Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 66,818 97,857
Less than 12 months, Gross Unrealized Losses (1,024) (3,610)
12 months or longer, Fair Value 115,001 62,689
12 months or longer, Gross Unrealized Losses (6,100) (5,541)
Total, Fair Value 181,819 160,546
Total, Gross Unrealized Losses (7,124) (9,151)
Fixed Income Securities | Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 2,203 67,926
Less than 12 months, Gross Unrealized Losses (105) (4,072)
12 months or longer, Fair Value 76,236 27,907
12 months or longer, Gross Unrealized Losses (6,523) (2,061)
Total, Fair Value 78,439 95,833
Total, Gross Unrealized Losses (6,628) (6,133)
Fixed Income Securities | Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 57,729 261,123
Less than 12 months, Gross Unrealized Losses (566) (8,480)
12 months or longer, Fair Value 241,105 71,192
12 months or longer, Gross Unrealized Losses (10,785) (6,378)
Total, Fair Value 298,834 332,315
Total, Gross Unrealized Losses (11,351) (14,858)
Fixed Income Securities | Foreign Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Fair Value 27,112 150,308
Less than 12 months, Gross Unrealized Losses (104) (5,469)
12 months or longer, Fair Value 115,392 31,232
12 months or longer, Gross Unrealized Losses (6,132) (2,590)
Total, Fair Value 142,504 181,540
Total, Gross Unrealized Losses $ (6,236) $ (8,059)