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ACCOUNTING STANDARDS AND BASIS OF PREPARATION - ECL Sensitivity (Details) - ARS ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Reported ECL allowance $ 8,424,714  
Financial assets $ 224,607,096 $ 181,261,533
Reported Provission Ratio 7.40%  
Favorable [member]    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Reported ECL allowance $ 6,927,295  
Reported Provission Ratio 6.09%  
Unfavorable [member]    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Reported ECL allowance $ 8,142,498  
Reported Provission Ratio 7.15%  
Gross carrying amount    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Financial assets $ 113,819,900