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Summary of Significant Accounting Policies - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Net unrealized gain (loss) on available-for-sale securities	$ (2,721)	$ 100	$ 1,158
Reclassification adjustment for gain on sale of available-for-sale securities	(588)	(451)	(494)
Net unrealized gain (loss) on available for sale securities	(3,309)	(351)	664
Tax expense (benefit)	(1,125)	(119)	226
Other comprehensive income (loss)	$ (2,184)	$ (232)	$ 438

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

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Amount after tax and 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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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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