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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Net unrealized gains (losses) on investments available for sale arising during the period, Pre-tax	$ (2,480)	$ 3,252	$ 685
Less: Amounts reclassified from accumulated other comprehensive income (loss), Pre-tax	(1,060)	(5,627)	(1,297)
Net current period other comprehensive income (loss), Pre-tax	(3,540)	(2,375)	(612)
Net unrealized gains (losses) on investments available for sale arising during the period, Tax	(963)	1,255	264
Less: Amounts reclassified from accumulated other comprehensive income (loss), Tax	(406)	(2,171)	(500)
Net current period other comprehensive income (loss), Tax	(1,369)	(916)	(236)
Net unrealized gains (losses) on investments available for sale arising during the period, After-tax	(1,517)	1,997	421
Less: Amounts reclassified from accumulated other comprehensive income (loss), After-tax	(654)	(3,456)	(797)
Net current period other comprehensive income (loss), After-tax	$ (2,171)	$ (1,459)	$ (376)

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