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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, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on sale of securities	$ (11,525)	$ (2,641)
Income taxes	(13,596)	(11,644)
NET INCOME	40,148	40,055
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on sale of securities	145	(2,765)
Income taxes	(37)	670
NET INCOME	$ 108	$ (2,095)

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