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Bank Premises and Equipment, Net (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Depreciation $ 932 $ 843 $ 772
Total building and equipment rental expense 236 271 135
Building and improvements [Member]      
Property, Plant and Equipment [Line Items]      
Depreciation 484 470 446
Furniture and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Depreciation $ 448 $ 373 $ 326