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SUBSEQUENT EVENTS (Details) - ARS ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 25, 2019
Apr. 11, 2019
Mar. 27, 2019
Sep. 06, 2018
Aug. 08, 2018
Jul. 06, 2018
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Subsequent Event [Abstract]                  
Maximum amount approved for treasury shares repurchase program       $ 1,800,000       $ 1,700,000  
Shares Repurchase Program term             180 days    
Cash dividends (in pesos per share)       $ 2.2081 $ 1.8242 $ 1.4167      
Treasury Shares [Member]                  
Subsequent Event [Abstract]                  
Shares issued (in shares)             13,600,780   0
Percentage of total common stock representing shares repurchased             1.71%    
Subsequent events [Member]                  
Subsequent Event [Abstract]                  
Maximum amount approved for treasury shares repurchase program     $ 1,500,000            
Shares Repurchase Program term     180 days            
Increase in legal reserve   $ 640,132              
Cash dividends   $ 6,942,000              
Cash dividends (in pesos per share)   $ 8.89              
Voluntary reserve   $ 6,354,164              
Percentage of voluntary reserve can be used for future invest, stock buyback and cash dividend payment   80.00%              
Cash dividend from voluntary reserve   $ 240,500              
Cash dividend from voluntary reserve (in pesos per sare)   $ 0.31              
Subsequent events [Member] | Treasury Shares [Member]                  
Subsequent Event [Abstract]                  
Shares issued (in shares) 15,310,025                
Percentage of total common stock representing shares repurchased 1.93%