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Minimum cash and minimum capital - Minimum cash (Detail) - ARS ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Minimum Cash [Line Items]    
BCRA – current account - not restricted $ 141,859,808,000 $ 129,727,266,000
BCRA – special guarantee accounts – restricted 7,297,680,000 6,873,561,000
SUBTOTAL BALANCES AT THE BCRA 149,157,488,000 136,600,827,000
Liquidity Bills – BCRA 107,693,328,000 135,674,610,000
TOTAL 279,416,301,000 294,130,473,000
Bonds Due May 2022    
Minimum Cash [Line Items]    
Argentine Treasury Bonds in pesos at fixed rate $ 22,565,485,000 $ 21,855,036,000