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Minimum cash and minimum capital - Minimum capital (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Minimum Capital [Abstract]    
Credit risk $ 17,999,427 $ 27,824,585
Operational risk 6,399,872 5,529,881
Market risk 303,718 142,735
Total capital 49,989,689 55,801,416
Excess capital $ 25,286,672 $ 22,304,215