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4. Premises and Equipment (Tables)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Summary of premises and equipment
(Dollars in thousands)            
    2017     2016  
             
Land   $ 3,700       3,670  
Buildings and improvements     19,312       16,398  
Furniture and equipment     21,115       19,996  
Construction in process     847       -  
                 
Total premises and equipment     44,974       40,064  
                 
Less accumulated depreciation     25,063       23,612  
                 
Total net premises and equipment   $ 19,911       16,452