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4. Premises and Equipment (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Summary of premises and equipment
   2019  2018
       
Land  $2,793    2,889 
Buildings and improvements   18,931    19,796 
Furniture and equipment   24,743    22,443 
Construction in process   395    381 
           
Total premises and equipment   46,862    45,509 
           
Less accumulated depreciation   28,258    27,059 
           
Total net premises and equipment  $18,604    18,450