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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
	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Net unrealized gains (losses) on investments available for sale arising during the period, Pre-tax	$ 6,020	$ 2,121
Less: Amounts reclassified from accumulated other comprehensive income (loss), Pre-tax	(667)	(171)
Net current period other comprehensive income (loss), Pre-tax	5,353	1,950
Net unrealized gains (losses) on investments available for sale arising during the period, Tax	2,327	818
Less: Amounts reclassified from accumulated other comprehensive income (loss), Tax	(255)	(65)
Net current period other comprehensive income (loss), Tax	2,072	753
Net unrealized gains (losses) on investments available for sale arising during the period, After-tax	3,693	1,303
Less: Amounts reclassified from accumulated other comprehensive income (loss), After-tax	(412)	(106)
Net current period other comprehensive income (loss), After-tax	$ 3,281	$ 1,197

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