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Summary of Securities with Gross Unrealized Losses (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | $ (5,661) |
Obligations of States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | (1,513) |
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | (4,738) |
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | (6,995) |
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | (5,723) |
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | (12,237) |
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | (7,237) |
Fixed Income Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 731,401 | $ 992,284
Less than 12 months, Gross Unrealized Losses | (14,488) | (34,755)
12 months or longer, Fair Value | 415,115 | 212,980
12 months or longer, Gross Unrealized Losses | (29,616) | (19,361)
Total, Fair Value | 1,146,516 | 1,205,264
Total, Gross Unrealized Losses | (44,104) | (54,116)
Fixed Income Securities | U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 298,152 | 335,781
Less than 12 months, Gross Unrealized Losses | (4,692) | (7,518)
12 months or longer, Fair Value | 12,768 | 8,322
12 months or longer, Gross Unrealized Losses | (969) | (912)
Total, Fair Value | 310,920 | 344,103
Total, Gross Unrealized Losses | (5,661) | (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 | 16,216 | 27,772
Less than 12 months, Gross Unrealized Losses | (285) | (1,378)
12 months or longer, Fair Value | 15,657 | 3,778
12 months or longer, Gross Unrealized Losses | (1,228) | (498)
Total, Fair Value | 31,873 | 31,550
Total, Gross Unrealized Losses | (1,513) | (1,876)
Fixed Income Securities | Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 25,678 | 51,517
Less than 12 months, Gross Unrealized Losses | (1,788) | (4,228)
12 months or longer, Fair Value | 25,407 | 7,860
12 months or longer, Gross Unrealized Losses | (2,950) | (1,381)
Total, Fair Value | 51,085 | 59,377
Total, Gross Unrealized Losses | (4,738) | (5,609)
Fixed Income Securities | Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 57,761 | 97,857
Less than 12 months, Gross Unrealized Losses | (1,230) | (3,610)
12 months or longer, Fair Value | 94,079 | 62,689
12 months or longer, Gross Unrealized Losses | (5,765) | (5,541)
Total, Fair Value | 151,840 | 160,546
Total, Gross Unrealized Losses | (6,995) | (9,151)
Fixed Income Securities | Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 19,425 | 67,926
Less than 12 months, Gross Unrealized Losses | (811) | (4,072)
12 months or longer, Fair Value | 76,881 | 27,907
12 months or longer, Gross Unrealized Losses | (4,912) | (2,061)
Total, Fair Value | 96,306 | 95,833
Total, Gross Unrealized Losses | (5,723) | (6,133)
Fixed Income Securities | Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 201,660 | 261,123
Less than 12 months, Gross Unrealized Losses | (3,963) | (8,480)
12 months or longer, Fair Value | 124,030 | 71,192
12 months or longer, Gross Unrealized Losses | (8,274) | (6,378)
Total, Fair Value | 325,690 | 332,315
Total, Gross Unrealized Losses | (12,237) | (14,858)
Fixed Income Securities | Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 112,509 | 150,308
Less than 12 months, Gross Unrealized Losses | (1,719) | (5,469)
12 months or longer, Fair Value | 66,293 | 31,232
12 months or longer, Gross Unrealized Losses | (5,518) | (2,590)
Total, Fair Value | 178,802 | 181,540
Total, Gross Unrealized Losses | $ (7,237) | $ (8,059)

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