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COMPOSITION OF THE MAIN ITEMS OF THE CONSOLIDATED STATEMENT OF FINANCIAL POSITION AND CONSOLIDATED INCOME STATEMENT - Other operating expenses (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other operating expenses      
Total $ 6,574,779 $ 8,656,215 $ 9,030,424
Promotions related with credit cards [member]      
Other operating expenses      
Total 525,355 695,109 886,298
Turnover tax [member]      
Other operating expenses      
Total 3,950,539 5,104,595 5,869,614
Fair value on initial recognition of loans [member]      
Other operating expenses      
Total 195,459 273,505 809,049
Contributions made to deposit insurance system [member]      
Other operating expenses      
Total 289,814 332,127 323,838
Other operating expenses [member]      
Other operating expenses      
Total $ 1,613,612 $ 2,250,879 $ 1,141,625