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Fee and commission income (Tables)
 12 Months Ended
Dec. 31, 2019
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Summary of Fee and Commission Income
    
            2019
               2018               2017 
Fee income from asset management
   1,824    1,853    2,126 
Commission income
   585    594    535 
Other
   114    112    140 
Total fee and commission income
  
 
2,523
 
  
 
2,558
 
  
 
2,802