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Securities purchased under agreements to resell (Tables)
 12 Months Ended
Dec. 31, 2019
Summary of securities purchased under agreements to resell [Abstract]  
Summary of securities purchased under agreements to resell
   
2019
   
2018
 
Available portfolio
  
 
971,991
 
  
 
488,809
 
  
 
 
   
 
 
 
National Treasury Notes (NTNs)
   771,099    65,136 
Financial Treasury Bills (LFTs)
   195,980    38,014 
National Treasury Bills (LTNs)
   4,912    385,659 
Collateral held
  
 
8,518,099
 
  
 
6,081,800
 
  
 
 
   
 
 
 
National Treasury Bills (LTNs)
   1,764,410    4,911,635 
National Treasury Notes (NTNs)
   6,753,689    1,170,165 
  
 
 
   
 
 
 
Total
  
 
9,490,090
 
  
 
6,570,609