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Bank Premises and Equipment, Net (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Depreciation $ 946 $ 932 $ 843
Total building and equipment rental expense 232 236 271
Building and improvements [Member]      
Property, Plant and Equipment [Line Items]      
Depreciation 484 484 470
Furniture and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Depreciation $ 462 $ 448 $ 373