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4. Premises and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Summary of premises and equipment
(Dollars in thousands)            
     2020      2019  
             
Land   $ 3,970       3,690  
Buildings and improvements     18,804       18,034  
Furniture and equipment     26,565       24,743  
Construction in process     10       395  
                 
Total premises and equipment     49,349       46,862  
                 
Less accumulated depreciation     30,749       28,258  
                 
Total net premises and equipment   $ 18,600       18,604