Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 432,686	$ 413,310
Other comprehensive income (loss)- before reclassifications	707	4,821
Amount reclassified from accumulated other comprehensive income	(24)	33
Other comprehensive income, net of tax	683	4,854
Balance	438,700	423,025
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(6,251)	(4,781)
Other comprehensive income, net of tax	683	4,854
Balance	(5,568)	73
Net Unrealized Holding Gain (Loss) on Securities Available for Sale, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(6,762)	(4,492)
Other comprehensive income (loss)- before reclassifications	707	4,821
Amount reclassified from accumulated other comprehensive income	0	0
Other comprehensive income, net of tax	707	4,821
Balance	(6,055)	329
Net Change in Net Actuarial (Gain) Loss and Prior Service Cost on Pension and Postretirement Benefit Plans, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	511	(289)
Other comprehensive income (loss)- before reclassifications	0	0
Amount reclassified from accumulated other comprehensive income	(24)	33
Other comprehensive income, net of tax	(24)	33
Balance	$ 487	$ (256)