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Other Comprehensive Income (Loss) - Reclassifications Adjustment for Gains (Losses) Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments	$ 542	$ 299
Income taxes	(9,943)	(7,517)
NET INCOME	26,408	20,067
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 investments	(202)	299
Income taxes	48	(74)
NET INCOME	$ (154)	$ 225

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