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Minimum cash and minimum capital - Minimum capital (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Minimum Capital [Abstract]    
Credit risk $ 29,522,630 $ 24,504,510
Operational risk 9,025,959 8,712,818
Market risk 246,474 413,483
Total capital 91,762,665 68,056,213
Excess capital $ 52,967,602 $ 34,425,402