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Securities sold under repurchase agreements (Tables)
 12 Months Ended
Dec. 31, 2019
Text Block [Abstract]  
Summary of Securities Sold under Repurchase Agreements
     2019      2018  

National Treasury Notes (NTNs)

      8,533,113        1,153,547  

National Treasury Bills (LTNs)

      5,653,994        5,142,881  

Financial Treasury Bills (LFTs)

      1,451,300        344,266  
  

 

 

     

 

 

  

Total

      15,638,407        6,640,694