Consolidated Statement in Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statement of Changes in Comprehensive Income [Abstract]
Net income	$ 12,638	$ 11,626	$ 13,385
Securities available for sale
Unrealized holding gain (loss) during the period	(1,105)	(920)	5,465
Income tax benefit	375	314	(1,857)
Securities available for sale	(730)	(606)	3,608
Reclassification adjustment for gains included in income	(255)	(429)	(616)
Income tax benefit	87	146	209
Reclassification	(168)	(283)	(407)
Change in unrecognized pension costs	(391)	(172)	(1,832)
Income tax benefit	133	58	623
Pension costs	(258)	(114)	(1,209)
Net other comprehensive income (loss)	(1,156)	(1,003)	1,992
Comprehensive income	$ 11,482	$ 10,623	$ 15,377