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Other Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 137,616	$ 125,173	$ 115,909
Amounts reclassified from accumulated other comprehensive loss	239	202	189
Total other comprehensive income (loss)	1,412	(1,842)	(448)
Reclassification of certain income tax effects from accumulated other comprehensive loss	199
Ending balance	184,461	137,616	125,173
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	2,008	3,554	3,730
Other comprehensive income (loss) before reclassifications	620	(1,533)	(188)
Amounts reclassified from accumulated other comprehensive loss	(8)	(13)	12
Total other comprehensive income (loss)	612	(1,546)	(176)
Reclassification of certain income tax effects from accumulated other comprehensive loss	565
Ending balance	3,185	2,008	3,554
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(4,345)	(4,049)	(3,777)
Other comprehensive income (loss) before reclassifications	553	(511)	(449)
Amounts reclassified from accumulated other comprehensive loss	247	215	177
Total other comprehensive income (loss)	800	(296)	(272)
Reclassification of certain income tax effects from accumulated other comprehensive loss	(764)
Ending balance	(4,309)	(4,345)	(4,049)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2,337)	(495)	(47)
Other comprehensive income (loss) before reclassifications	1,173	(2,044)	(637)
Amounts reclassified from accumulated other comprehensive loss	239	202	189
Total other comprehensive income (loss)	1,412	(1,842)	(448)
Reclassification of certain income tax effects from accumulated other comprehensive loss	(199)
Ending balance	$ (1,124)	$ (2,337)	$ (495)

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Tax Cuts and Jobs Act of 2017, reclassification from AOCI to retained earnings tax effect.

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

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

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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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