Premises and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total	$ 38,116	$ 37,713
Less accumulated depreciation	(21,523)	(20,688)
Net	16,593	17,025
Land
Property, Plant and Equipment [Line Items]
Total	3,536	3,536
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total	23,504	23,409
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Total	11,036	10,725
Construction in progress
Property, Plant and Equipment [Line Items]
Total	$ 40	$ 43