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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on sale of securities									$ (2,089)	$ 2,570	$ 2,294
Income taxes, current									(35,822)	(63,549)	(63,473)
NET INCOME	$ (6,468)	$ 37,380	$ 46,084	$ 40,055	$ 36,396	$ 9,964	$ 29,376	$ 31,199	117,051	106,935	99,410
Net changes related to available-for-sale securities: | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses) on sale of securities									(2,803)	2,570	2,294
Income taxes, current									694	(982)	(877)
NET INCOME									$ (2,109)	$ 1,588	$ 1,417

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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