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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity [Abstract]
Unrealized holding gains (losses) arising during the period, Pre-tax	$ (2,488)	$ 4,116	$ (10,522)	$ 8,041
Less: Reclassification adjustment for (gains) losses realized in net income, Pre-tax	32	(1,710)	2,797	(1,647)
Other comprehensive income (loss), Pre-tax	(2,456)	2,406	(7,725)	6,394
Reclassification adjustments to retained earnings, Pre-tax			5,830
Change in accumulated other comprehensive income (loss), Pre-tax	(2,456)	2,406	(1,895)	6,394
Unrealized holding gains (losses) arising during the period, Tax	(618)	1,574	(2,507)	3,074
Less: Reclassification adjustment for (gains) losses realized in net income, Tax	11	(654)	681	(630)
Other comprehensive income (loss), Tax	(607)	920	(1,826)	2,444
Reclassification adjustments to retained earnings, Tax			2,811
Change in accumulated other comprehensive income (loss), Tax	(607)	920	985	2,444
Unrealized holding gains (losses) arising during the period, After-tax	(1,870)	2,542	(8,015)	4,967
Less: Reclassification adjustment for (gains) losses realized in net income, After-tax	21	(1,056)	2,116	(1,017)
Other comprehensive income (loss), After-tax	(1,849)	1,486	(5,899)	3,950
Reclassification adjustments to retained earnings, After-tax			3,019
Change in accumulated other comprehensive income (loss), After-tax	$ (1,849)	$ 1,486	$ (2,880)	$ 3,950

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