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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Equity [Abstract]
Net unrealized gains (losses) on investments available for sale arising during the period, Pre-tax	$ (694)	$ (1,282)	$ 10,460	$ (815)
Less: Amounts reclassified from accumulated other comprehensive income (loss), Pre-tax	(101)	(11)	(1,344)	(292)
Net current period other comprehensive income (loss), Pre-tax	(795)	(1,293)	9,116	(1,107)
Net unrealized gains (losses) on investments available for sale arising during the period, Tax	(265)	(495)	3,998	(314)
Less: Amounts reclassified from accumulated other comprehensive income (loss), Tax	(39)	(4)	(513)	(113)
Net current period other comprehensive income (loss), Tax	(304)	(499)	3,485	(427)
Net unrealized gains (losses) on investments available for sale arising during the period, After-tax	(429)	(787)	6,462	(501)
Less: Amounts reclassified from accumulated other comprehensive income (loss), After-tax	(62)	(7)	(831)	(179)
Net current period other comprehensive income (loss), After-tax	$ (491)	$ (794)	$ 5,631	$ (680)

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