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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Net realized gains (losses) on sale on investments $ (311)   $ 882   $ (388) $ 94
Income tax expense (benefit) (12,489)   (8,973)   (26,316) (17,591)
Net of tax 35,416 $ 33,657 28,566 $ 24,173 69,073 52,739
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 73   (21)   4 (722)
Income tax expense (benefit) (18)   4   (1) 177
Net of tax $ 55   $ (17)   $ 3 $ (545)