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Accumulated Other Comprehensive Loss - Schedule of Changes in Component of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 45,953	$ 59,564
Unrealized holding losses, net of tax	(663)	(95)
Reclassification adjustment, net of tax	(5)	36
Pension liability adjustment, net of tax	1,396	25
Change during period	728	(34)
Ending Balance	52,151	45,953
Securities Available for Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(192)	(133)
Unrealized holding losses, net of tax	(663)	(95)
Reclassification adjustment, net of tax	(5)	36
Change during period	(668)	(59)
Ending Balance	(860)	(192)
Adjustments Related to Pension Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,396)	(1,421)
Pension liability adjustment, net of tax	1,396	25
Change during period	1,396	25
Ending Balance		(1,396)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,588)	(1,554)
Change during period	728	(34)
Ending Balance	$ (860)	$ (1,588)

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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