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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				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments	$ 496		$ 168		$ 1,038	$ 467
Income tax expense	(8,118)		(7,556)		(18,061)	(15,073)
Net income	21,941	$ 26,408	19,882	$ 20,067	48,349	39,949
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	(245)		168		(447)	467
Income tax expense	59		(41)		107	(115)
Net income	$ (186)		$ 127		$ (340)	$ 352

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