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4. Premises and Equipment (Tables)
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Summary of premises and equipment
(Dollars in thousands)          
    2015     2014
           
Land   $ 3,669       3,681
Buildings and improvements     15,889       15,864
Furniture and equipment     19,462       18,442
               
Total premises and equipment     39,020       37,987
               
Less accumulated depreciation     22,044       20,987
               
Total net premises and equipment   $ 16,976       17,000