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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net realized gains (losses) on sale on investments $ (788) $ 58
Income tax expense (benefit) (8,618) (4,934)
Net of tax 24,173 17,537
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net realized gains (losses) on sale on investments (701) (264)
Income tax expense (benefit) 173 65
Net of tax $ (528) $ (199)