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Commissions Expense - Summary of Commissions Expense (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fee and commission expense [line items]      
Fee and commission expense $ 2,047,292 $ 2,191,792 $ 1,947,749
Commissions related to debt securities [member]      
Disclosure of fee and commission expense [line items]      
Fee and commission expense     606
Commissions related to trading and foreign exchange transactions [member]      
Disclosure of fee and commission expense [line items]      
Fee and commission expense 117,519 209,142 102,926
Commissions paid ATM exchange [member]      
Disclosure of fee and commission expense [line items]      
Fee and commission expense 1,263,086 1,057,785 818,625
Checkbooks commissions and compensating cameras [member]      
Disclosure of fee and commission expense [line items]      
Fee and commission expense 404,450 453,612 449,593
Commissions credit cards and foreign trade [member]      
Disclosure of fee and commission expense [line items]      
Fee and commission expense $ 262,237 $ 471,253 $ 575,999