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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, 2018	Mar. 31, 2017
Equity [Abstract]
Unrealized holding gains (losses) arising during the period, Pre-tax	$ (8,034)	$ 3,925
Less: Reclassification adjustment for (gains) losses realized in net income, Pre-tax	2,765	63
Other comprehensive income (loss), Pre-tax	(5,269)	3,988
Reclassification adjustments to retained earnings, Pre-tax	5,830
Change in accumulated other comprehensive income (loss), Pre-tax	561	3,988
Unrealized holding gains (losses) arising during the period, Tax	(1,889)	1,500
Less: Reclassification adjustment for (gains) losses realized in net income, Tax	670	24
Other comprehensive income (loss), Tax	(1,219)	1,524
Reclassification adjustments to retained earnings, Tax	2,811
Change in accumulated other comprehensive income (loss), Tax	1,592	1,524
Unrealized holding gains (losses) arising during the period, After-tax	(6,145)	2,425
Less: Reclassification adjustment for (gains) losses realized in net income, After-tax	2,095	39
Other comprehensive income (loss), After-tax	(4,050)	2,464
Reclassification adjustments to retained earnings, After-tax	3,019
Change in accumulated other comprehensive income (loss), After-tax	$ (1,031)	$ 2,464

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Amount of the cumulative effect on retained earnings before related income tax effect.

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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