Premises and Equipment (Schedule of Premises and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Premises and equipment	$ 19,881	$ 18,519
Accumulated depreciation	(10,508)	(9,772)
Premises and equipment, net	9,373	8,747
Depreciation premises and equipment	852	865	$ 834
Accumulated depreciation, retired assets	116	92
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	1,206	1,206
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	12,517	11,371
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment	$ 6,158	$ 5,942