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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)

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