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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, 2019
Dec. 31, 2018
Foreign currency sensitivity analysis    
Exchange rate variation 31.90% 29.00%
Exchange rate variation (31.90%) (29.00%)
Increase in profit loss $ 251,960 $ 563,543
Decrease in profit loss (251,960) (563,543)
Increase in equity 251,960 563,543
Decrease in equity $ (251,960) $ (563,543)
US Dollar [member]    
Foreign currency sensitivity analysis    
Exchange rate variation 31.90% 29.00%
Exchange rate variation (31.90%) (29.00%)
Increase in profit loss $ 200,700 $ 518,252
Decrease in profit loss (200,700) (518,252)
Increase in equity 200,700 518,252
Decrease in equity $ (200,700) $ (518,252)
Euro [member]    
Foreign currency sensitivity analysis    
Exchange rate variation 31.90% 29.00%
Exchange rate variation (31.90%) (29.00%)
Increase in profit loss $ 5,724 $ (4,884)
Decrease in profit loss (5,724) 4,884
Increase in equity 5,724 (4,884)
Decrease in equity $ (5,724) $ 4,884
Others [member]    
Foreign currency sensitivity analysis    
Exchange rate variation 31.90% 29.00%
Exchange rate variation (31.90%) (29.00%)
Increase in profit loss $ 45,536 $ 50,176
Decrease in profit loss (45,536) (50,176)
Increase in equity 45,536 50,176
Decrease in equity $ (45,536) $ (50,176)