Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			$ 413,310	$ 393,444
Other comprehensive income (loss)- before reclassifications	$ (75)	$ 4,713	7,484	3,411
Amount reclassified from accumulated other comprehensive income	8	40	(376)	(76)
Other comprehensive (loss) income, net of tax	(67)	4,753	7,109	3,335
Balance	435,608	412,292	435,608	412,292
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	2,395	(5,927)	(4,781)	(4,509)
Other comprehensive (loss) income, net of tax			7,109	3,335
Balance	2,328	(1,174)	2,328	(1,174)
Net Unrealized Holding Gain (Loss) on Securities Available for Sale, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	2,667	(5,144)	(4,492)	(3,693)
Other comprehensive income (loss)- before reclassifications	(75)	4,713	7,484	3,411
Amount reclassified from accumulated other comprehensive income	0	0	(401)	(149)
Other comprehensive (loss) income, net of tax	(75)	4,713	7,084	3,262
Balance	2,592	(431)	2,592	(431)
Net Change in Net Actuarial Loss (Gain) and Prior Service Cost on Pension and Postretirement Benefit Plans, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(272)	(783)	(289)	(816)
Other comprehensive income (loss)- before reclassifications	0	0	0	0
Amount reclassified from accumulated other comprehensive income	8	40	25	73
Other comprehensive (loss) income, net of tax	8	40	25	73
Balance	$ (264)	$ (743)	$ (264)	$ (743)