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4. Premises and Equipment (Tables)
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Summary of premises and equipment
(Dollars in thousands)          
    2016     2015
           
Land   $ 3,670       3,669
Buildings and improvements     16,398       15,889
Furniture and equipment     19,996       19,462
               
Total premises and equipment     40,064       39,020
               
Less accumulated depreciation     23,612       22,044
               
Total net premises and equipment   $ 16,452       16,976