Other Comprehensive Income (Loss) - Reclassifications Adjustment for Gains (Losses) Out of Accumulated Other Comprehensive Income (Detail) - AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income taxes	$ (74)	$ (37)
NET INCOME	225	108
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on investments	299	145
Income taxes	(74)	(37)
NET INCOME	$ 225	$ 108