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Consolidated Statement of Changes in Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statement of Changes in Comprehensive Income [Abstract]
Net income	$ 13,025	$ 12,638	$ 11,626
Securities available for sale
Unrealized holding loss during the period	(1,283)	(1,105)	(920)
Income tax benefit	436	375	314
Securities available for sale	(847)	(730)	(606)
Reclassification adjustment for (gains) losses included in income	(1,035)	(255)	(429)
Income tax benefit	352	87	146
Reclassification	(683)	(168)	(283)
Change in unrecognized pension costs	127	(391)	(172)
Income tax benefit	(44)	133	58
Pension costs	83	(258)	(114)
Net other comprehensive income	(1,447)	(1,156)	(1,003)
Comprehensive income	$ 11,578	$ 11,482	$ 10,623

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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