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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net realized gains (losses) on sale on investments $ (77) $ (788)
Income tax expense (benefit) (13,827) (8,618)
Net of tax 33,657 24,173
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 (69) (701)
Income tax expense (benefit) 17 173
Net of tax $ (52) $ (528)