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Fee and Commission Expense (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fee and commission expense [abstract]      
For credit and debit cards $ 8,524,712 $ 8,266,906 $ 7,191,092
For promotions 1,746,686 2,623,670 2,724,585
For foreign trade transactions 278,455 485,530 328,438
Linked to transactions with securities 4,534 4,000 3,902
Other commission expenses 868,847 1,461,741 1,273,686
Total Fee and Commission Expense $ 11,423,234 $ 12,841,847 $ 11,521,703