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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 |

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