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RISK MANAGEMENT POLICIES - Paragraphs (Details) - factor
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Credit risk [member]    
Disclosure of Risk Management [line items]    
Economic capital calculation holding period 1 year  
Factoring exposure holding period 6 months  
Interest rate risk [member]    
Disclosure of Risk Management [line items]    
Provision utilization holding period 90 days  
Percentage of interest rate confidence level 99.00%  
Liquidity risk [member]    
Disclosure of Risk Management [line items]    
Number of key factors 2  
Alert threshold (as a percent) 10.00%  
Liquidity stress level period 30 days  
Individuals [member] | Credit risk [member]    
Disclosure of Risk Management [line items]    
Percentage of credit risk confidence level 99.90%  
Company [member] | Credit risk [member]    
Disclosure of Risk Management [line items]    
Percentage of credit risk confidence level 99.00%  
Securities Issued by BCRA and Government Security Due November 2020 [Member]    
Disclosure of Risk Management [line items]    
Percentage to total portfolio 91.30% 74.10%