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v3.23.2

Summary of Securities with Gross Unrealized Losses (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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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)

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