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RISK MANAGEMENT POLICIES - Sensitivity analysis performed reasonably possible changes in foreign exchange rates (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Foreign currency sensitivity analysis    
Exchange rate variation 40.20% 31.90%
Exchange rate variation (40.20%) (31.90%)
Increase in profit loss $ 2,879,151 $ 340,335
Decrease in profit loss (2,879,151) (340,335)
Increase in equity 2,879,151 340,335
Decrease in equity $ (2,879,151) $ (340,335)
US Dollar [member]    
Foreign currency sensitivity analysis    
Exchange rate variation 40.20% 31.90%
Exchange rate variation (40.20%) (31.90%)
Increase in profit loss $ 2,687,853 $ 270,549
Decrease in profit loss (2,687,853) (270,549)
Increase in equity 2,687,853 270,549
Decrease in equity $ (2,687,853) $ (270,549)
Euro [member]    
Foreign currency sensitivity analysis    
Exchange rate variation 40.20% 31.90%
Exchange rate variation (40.20%) (31.90%)
Increase in profit loss $ 75,960 $ 7,793
Decrease in profit loss (75,960) (7,793)
Increase in equity 75,960 7,793
Decrease in equity $ (75,960) $ (7,793)
Others [member]    
Foreign currency sensitivity analysis    
Exchange rate variation 40.20% 31.90%
Exchange rate variation (40.20%) (31.90%)
Increase in profit loss $ 115,338 $ 61,993
Decrease in profit loss (115,338) (61,993)
Increase in equity 115,338 61,993
Decrease in equity $ (115,338) $ (61,993)