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Comprehensive Income and Accumulated Other Comprehensive Loss - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments	$ 158	$ 5,133	$ (181)	$ 5,466
Income before income taxes	17,793	12,327	52,282	53,430
Income tax expense	(3,469)	(2,366)	(10,040)	(10,503)
Net income	14,324	9,961	42,242	42,927
Unrealized Gains (Losses) On Debt Securities, Net Of Tax [Member] | Reclassification Out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments	37	(243)	(136)	(438)
Income before income taxes	37	(243)	(136)	(438)
Income tax expense	(8)	51	28	92
Net income	$ 29	$ (192)	$ (108)	$ (346)

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