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ACCOUNTING STANDARDS AND BASIS OF PREPARATION - Allowance for Loan Losses (Details)
 12 Months Ended
Dec. 31, 2019
ARS ($)
item
segment
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Number of segments | segment 3
Number of scenarios considered to estimate credit losses | item 3
Accounts period past due is to consider delinquent 90 days
Accounts period past due is to consider delinquent 30 days
Retail [member] | Bottom of range  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Past due accounts that raises significant increase in credit risk 31 days
Retail [member] | Top of range  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Past due accounts that raises significant increase in credit risk 90 days
Corporate [member]  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Probably of default that raises significant increase in credit risk 30.00%
Consumer [member] | Bottom of range  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Past due accounts that raises significant increase in credit risk 31 days
Consumer [member] | Top of range  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Past due accounts that raises significant increase in credit risk 90 days
Scenario one [member] | Retail [member]  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Real Wage 0.21
Private sector real wage 50.28%
Scenario one [member] | Corporate [member]  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Interest Rate 32.48%
Scenario one [member] | Consumer [member]  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Monthly Economic Activity Estimator 140.85
Scenario Two [member] | Retail [member]  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Real Wage 2.37
Private sector real wage 41.39%
Scenario Two [member] | Corporate [member]  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Interest Rate 32.41%
Scenario Two [member] | Consumer [member]  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Monthly Economic Activity Estimator 151.52
Scenario Three [member] | Retail [member]  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Real Wage (1.67)
Private sector real wage 51.63%
Scenario Three [member] | Corporate [member]  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Interest Rate 40.55%
Scenario Three [member] | Consumer [member]  
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]  
Monthly Economic Activity Estimator 135.86