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Minimum cash and minimum capital - Minimum cash (Detail) - ARS ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Minimum Cash [Line Items]    
BCRA – current account - not restricted $ 85,945,337,000 $ 146,289,273,000
BCRA – special guarantee accounts – restricted 4,553,788,000 3,849,897,000
SUBTOTAL BALANCES AT THE BCRA 90,499,125,000 150,139,170,000
Liquidity Bills – BCRA 89,885,499,000 45,009,654,000
TOTAL 194,863,757,000 205,087,380,000
Bonds Due May 2022    
Minimum Cash [Line Items]    
Argentine Treasury Bonds in pesos at fixed rate $ 14,479,133,000  
Bonds Due November 2020    
Minimum Cash [Line Items]    
Argentine Treasury Bonds in pesos at fixed rate   $ 9,938,556,000