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Bank Premises and Equipment, Net (Major Classes of Bank Premises and Equipment and Total Accumulated Depreciation) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, gross $ 31,799 $ 31,533
Less accumulated depreciation 12,220 11,364
Bank premises and equipment, net 19,579 20,169
Land [Member]    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, gross 6,729 6,729
Building and improvements [Member]    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, gross 17,970 17,928
Furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, gross $ 7,100 $ 6,876