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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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity [Abstract]
Net unrealized gains (losses) on investments available for sale arising during the period, Pre-tax	$ 4,116	$ 5,134	$ 8,041	$ 11,153
Less: Amounts reclassified from accumulated other comprehensive income (loss), Pre-tax	(1,710)	(576)	(1,647)	(1,243)
Net current period other comprehensive income (loss), Pre-tax	2,406	4,558	6,394	9,910
Net unrealized gains (losses) on investments available for sale arising during the period, Tax	1,574	1,937	3,074	4,263
Less: Amounts reclassified from accumulated other comprehensive income (loss), Tax	(654)	(220)	(630)	(475)
Net current period other comprehensive income (loss), Tax	920	1,717	2,444	3,788
Net unrealized gains (losses) on investments available for sale arising during the period, After-tax	2,542	3,197	4,967	6,890
Less: Amounts reclassified from accumulated other comprehensive income (loss), After-tax	(1,056)	(356)	(1,017)	(768)
Net current period other comprehensive income (loss), After-tax	$ 1,486	$ 2,841	$ 3,950	$ 6,122

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