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Deposits guarantee regime - Additional Information (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
May 01, 2020
Feb. 28, 2019
Dec. 31, 2020
Dec. 31, 2019
Deposits Guarantee Regime [Line Items]        
Contributions to the Deposits Guarantee Fund     $ 696,691 $ 824,817
Percentage of Shares in SEDESA     10.038  
Bottom of range [member]        
Deposits Guarantee Regime [Line Items]        
Refund of guarantee amount     $ 450  
Argentine Central Bank [member]        
Deposits Guarantee Regime [Line Items]        
Increase in contribution of deposits guarantee fund $ 1,500      
BCRA [member] | Bottom of range [member]        
Deposits Guarantee Regime [Line Items]        
Increase in contribution of deposits guarantee fund   $ 450    
BCRA [member] | Top of range [member]        
Deposits Guarantee Regime [Line Items]        
Increase in contribution of deposits guarantee fund   $ 1,000