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ACCOUNTING STANDARDS AND BASIS OF PREPARATION - Allowance for Loan Losses (Details)
 12 Months Ended
Dec. 31, 2021
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Dec. 31, 2020
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Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Number of segments | segment 3  
Number of scenarios considered to estimate credit losses captured non linealrities 3 3
Minimum    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Portfolio classification score under Argentina Central Bank 1  
Number of notes whose internal behavior score is deteriorated from the approval score 2  
Minimum | Corporate Banking    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Past due accounts that raises significant increase in credit risk 31 days  
Maximum | Corporate Banking    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Past due accounts that raises significant increase in credit risk 90 days  
Consumer [member]    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Period past for financial instruments in default and credit impaired 90 days  
Consumer [member] | Minimum    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Past due accounts that raises significant increase in credit risk 31 days  
Consumer [member] | Maximum    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Past due accounts that raises significant increase in credit risk 90 days  
Personal and Business Banking    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Probably of default that raises significant increase in credit risk 30.00%  
Period past for financial instruments in default and credit impaired 90 days  
Personal and Business Banking | Minimum    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Past due accounts that raises significant increase in credit risk 31 days  
Personal and Business Banking | Maximum    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Past due accounts that raises significant increase in credit risk 90 days  
Corporate Banking    
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]    
Period past for financial instruments in default and credit impaired 90 days