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ACCOUNTING STANDARDS AND BASIS OF PREPARATION - ECL Sensitivity (Details) - ARS ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Reported ECL allowance $ 6,751,939  
Financial assets $ 133,142,903 $ 206,213,605
Reported ECL Coverage 7.13%  
Favorable [member]    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Reported ECL allowance $ 6,702,980  
Expected credit loss rate 7.07%  
Unfavorable [member]    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Reported ECL allowance $ 6,779,811  
Expected credit loss rate 7.15%  
Gross carrying amount    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Financial assets $ 94,761,950