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Bank Premises and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, gross $ 24,824 $ 23,432  
Less accumulated depreciation and amortization (15,426) (14,025)  
Bank premises and equipment, net 9,398 9,407  
Depreciation and amortization 1,429 1,320 $ 1,392
Land      
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, gross 1,131 1,131  
Buildings and improvements      
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, gross 6,754 6,680  
Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, gross 12,345 11,521  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, gross $ 4,594 $ 4,100