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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on sale of securities	$ 403	$ 803	$ (2,093)	$ 2,450
Income taxes	(13,787)	(6,635)	(40,595)	(41,354)
NET INCOME	37,380	9,964	123,519	70,539
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) [Member] | Debt Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on sale of securities	(10)	803	(2,807)	2,450
Income taxes	2	(308)	683	(938)
NET INCOME	$ (8)	$ 495	$ (2,124)	$ 1,512

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