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Restriction on Dividends Distribution - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2020
ARS ($)
$ / shares
Apr. 30, 2020
ARS ($)
Dec. 31, 2020
ARS ($)
$ / shares
Dec. 31, 2020
ARS ($)
$ / shares
Dec. 31, 2019
ARS ($)
$ / shares
Dec. 31, 2019
ARS ($)
$ / shares
Dec. 31, 2018
ARS ($)
$ / shares
Dec. 31, 2018
$ / shares
Disclosure restrictions to dividends distribution [line items]                
Cash dividends $ 12,788,268   $ 19,980,438   $ 11,580,876   $ 9,448,973  
Basic earnings (loss) per share | (per share)     $ 40.9037 $ 40.9037 $ 44.1116 $ 44.1116 $ (2.2689) $ (2.2689)
Debit amounts of Other comprehensive income     $ 5,691,362          
Top of range [member]                
Disclosure restrictions to dividends distribution [line items]                
Aggregate dividend distribution     3,791,722          
Dividend Distribution [member]                
Disclosure restrictions to dividends distribution [line items]                
Cash dividends $ 12,788,268 $ 10,000,426            
Basic earnings (loss) per share | $ / shares $ 15.64       $ 10   $ 5  
Unappropriated retained earnings [member]                
Disclosure restrictions to dividends distribution [line items]                
Special reserve     $ 7,279,036 $ 7,279,036 $ 3,475,669 $ 3,475,669    
Basic earnings (loss) per share | $ / shares $ 20              
Banco Macro SA [member]                
Disclosure restrictions to dividends distribution [line items]                
Percentage of legal retained earnings     20.00%          
Percentage of risk-weighted assets kept as capital maintenance margin     3.50%