Premises and Equipment Class of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total cost	$ 24,854	$ 23,237
Less accumulated depreciation	(11,329)	(10,182)
Premises and equipment, net	13,525	13,055
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	2,930	2,617
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	13,057	12,288
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	8,833	7,890
Construction in progress and deposits on equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 34	$ 442