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Premises and Equipment (Components of Premises and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 27,020 $ 26,938
Accumulated depreciation (13,156) (13,407)
Property, Plant and Equipment, Net, Total 13,864 13,531
Land and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 2,771 2,925
Buildings and improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 17,613 17,662
Furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 6,636 $ 6,351