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COMPOSITION OF THE MAIN ITEMS OF THE CONSOLIDATED STATEMENT OF FINANCIAL POSITION AND CONSOLIDATED INCOME STATEMENT - Service fee income (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
COMPOSITION OF THE MAIN ITEMS OF THE CONSOLIDATED STATEMENT OF FINANCIAL POSITION AND CONSOLIDATED INCOME STATEMENT      
Commissions from deposits accounts $ 3,509,557 $ 3,398,652 $ 3,591,081
Commissions from credit and debit cards 2,897,583 3,361,286 3,598,831
Commissions from loans operations 294,820 601,763 543,388
Others 1,897,647 1,757,005 1,594,665
Total $ 8,599,607 $ 9,118,706 $ 9,327,965