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4. Premises and Equipment (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Summary of premises and equipment
(Dollars in thousands)      
   2018  2017
       
Land  $3,456    3,700 
Buildings and improvements   19,357    19,312 
Furniture and equipment   22,315    21,115 
Construction in process   381    847 
           
Total premises and equipment   45,509    44,974 
           
Less accumulated depreciation   27,059    25,063 
           
Total net premises and equipment  $18,450    19,911