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Summary of Securities with Gross Unrealized Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | $ (8,430) |
Obligations of States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | (1,876) |
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | (5,609) |
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | (9,151) |
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | (6,133) |
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | (14,858) |
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Total, Gross Unrealized Losses | (8,059) |
Fixed Income Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 992,284 | $ 627,112
Less than 12 months, Gross Unrealized Losses | (34,755) | (6,997)
12 months or longer, Fair Value | 212,980 | 18,972
12 months or longer, Gross Unrealized Losses | (19,361) | (634)
Total, Fair Value | 1,205,264 | 646,084
Total, Gross Unrealized Losses | (54,116) | (7,631)
Fixed Income Securities | U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 335,781 | 114,894
Less than 12 months, Gross Unrealized Losses | (7,518) | (390)
12 months or longer, Fair Value | 8,322 | 970
12 months or longer, Gross Unrealized Losses | (912) | (29)
Total, Fair Value | 344,103 | 115,864
Total, Gross Unrealized Losses | (8,430) | (419)
Fixed Income Securities | Agency Obligations |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value |  | 5,380
Less than 12 months, Gross Unrealized Losses |  | (68)
12 months or longer, Fair Value |  | 0
12 months or longer, Gross Unrealized Losses |  | 0
Total, Fair Value |  | 5,380
Total, Gross Unrealized Losses |  | (68)
Fixed Income Securities | Obligations of States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 27,772 | 13,346
Less than 12 months, Gross Unrealized Losses | (1,378) | (301)
12 months or longer, Fair Value | 3,778 | 0
12 months or longer, Gross Unrealized Losses | (498) | 0
Total, Fair Value | 31,550 | 13,346
Total, Gross Unrealized Losses | (1,876) | (301)
Fixed Income Securities | Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 51,517 | 143,674
Less than 12 months, Gross Unrealized Losses | (4,228) | (2,222)
12 months or longer, Fair Value | 7,860 | 3,009
12 months or longer, Gross Unrealized Losses | (1,381) | (62)
Total, Fair Value | 59,377 | 146,683
Total, Gross Unrealized Losses | (5,609) | (2,284)
Fixed Income Securities | Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 97,857 | 102,309
Less than 12 months, Gross Unrealized Losses | (3,610) | (703)
12 months or longer, Fair Value | 62,689 | 10,662
12 months or longer, Gross Unrealized Losses | (5,541) | (271)
Total, Fair Value | 160,546 | 112,971
Total, Gross Unrealized Losses | (9,151) | (974)
Fixed Income Securities | Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 67,926 | 50,448
Less than 12 months, Gross Unrealized Losses | (4,072) | (466)
12 months or longer, Fair Value | 27,907 | 1,286
12 months or longer, Gross Unrealized Losses | (2,061) | (161)
Total, Fair Value | 95,833 | 51,734
Total, Gross Unrealized Losses | (6,133) | (627)
Fixed Income Securities | Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 261,123 | 129,146
Less than 12 months, Gross Unrealized Losses | (8,480) | (1,954)
12 months or longer, Fair Value | 71,192 | 2,633
12 months or longer, Gross Unrealized Losses | (6,378) | (100)
Total, Fair Value | 332,315 | 131,779
Total, Gross Unrealized Losses | (14,858) | (2,054)
Fixed Income Securities | Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 150,308 | 67,915
Less than 12 months, Gross Unrealized Losses | (5,469) | (893)
12 months or longer, Fair Value | 31,232 | 412
12 months or longer, Gross Unrealized Losses | (2,590) | (11)
Total, Fair Value | 181,540 | 68,327
Total, Gross Unrealized Losses | $ (8,059) | $ (904)

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