Bank Premises and Equipment, Net (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Depreciation	$ 925	$ 946	$ 932
Total building and equipment rental expense	230	232	236
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciation	483	484	484
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation	$ 442	$ 462	$ 448