Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Premises and Equipment	$ 41,714	$ 40,900
Accumulated depreciation and amortization	(20,175)	(19,700)
Premises and Equipment, net	21,539	21,200
Land
Property, Plant and Equipment [Line Items]
Premises and Equipment	8,074	8,074
Buildings and land improvements
Property, Plant and Equipment [Line Items]
Premises and Equipment	19,775	19,264
Equipment
Property, Plant and Equipment [Line Items]
Premises and Equipment	$ 13,865	$ 13,562