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ASSETS AND LIABILITIES IN FOREIGN CURRENCY (Details) - ARS ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency $ 3,953,905 $ 2,887,749
Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 41,918,828 65,442,813
Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 37,964,923 62,555,064
US Dollar [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 3,789,523  
US Dollar [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 41,179,299  
US Dollar [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 37,389,776  
Euro [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 17,943  
Euro [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 593,090  
Euro [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 575,147  
Real    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 15,285  
Real | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 15,285  
Others [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 131,154  
Others [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 131,154  
Deposits [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 23,336,727 48,179,530
Deposits [member] | US Dollar [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 22,855,146  
Deposits [member] | Euro [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 481,581  
Non-financial public sector [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 2,171,358 12,152,394
Non-financial public sector [member] | US Dollar [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 2,171,272  
Non-financial public sector [member] | Euro [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 86  
Financial sector [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 9,062 4,581
Financial sector [member] | US Dollar [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 9,062  
Non-financial private sector and foreign residents [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 21,156,307 36,022,555
Non-financial private sector and foreign residents [member] | US Dollar [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 20,674,812  
Non-financial private sector and foreign residents [member] | Euro [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 481,495  
Liabilities at fair value with changes in results [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency   235,188
Other financial liabilities [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 4,091,775 774,926
Other financial liabilities [member] | US Dollar [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 3,998,209  
Other financial liabilities [member] | Euro [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 93,566  
Financing received from the Argentine Central Bank and other financial entities [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 8,075,471 10,444,759
Financing received from the Argentine Central Bank and other financial entities [member] | US Dollar [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 8,075,471  
Subordinated negotiable obligations [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 2,119,888 2,128,759
Subordinated negotiable obligations [member] | US Dollar [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 2,119,888  
Other non-financial liabilities [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 341,062 791,902
Other non-financial liabilities [member] | US Dollar [member] | Liabilities [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 341,062  
Cash and due from banks | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 13,896,907 25,164,561
Cash and due from banks | US Dollar [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 13,161,262  
Cash and due from banks | Euro [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 589,529  
Cash and due from banks | Real | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 15,285  
Cash and due from banks | Others [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 130,831  
Government and corporate securities at fair value with changes in results [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 704,916 4,296,153
Government and corporate securities at fair value with changes in results [member] | US Dollar [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 704,916  
Derivatives [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency   20,621
Other Financial Assets [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 1,151,505 915,523
Other Financial Assets [member] | US Dollar [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 1,151,257  
Other Financial Assets [member] | Euro [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 248  
Loans and other financing [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 21,482,922 32,505,333
Loans and other financing [member] | US Dollar [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 21,479,286  
Loans and other financing [member] | Euro [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 3,313  
Loans and other financing [member] | Others [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 323  
Other Debt Securities [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 65 1,599,586
Other Debt Securities [member] | US Dollar [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 65  
Financial assets in guarantee | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 4,503,242 711,530
Financial assets in guarantee | US Dollar [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 4,503,242  
Other Non Financial Assets [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency 179,271 $ 229,506
Other Non Financial Assets [member] | US Dollar [member] | Assets [member]    
Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory [line items]    
Assets and (liabilities) in foreign currency $ 179,271