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FAIR VALUES - Fair value of financial instruments (Details) - At fair value [member] - ARS ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets $ 14,067,819 $ 26,396,191
Financial liabilities 6,186,292 5,053,361
Cash and due from banks    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets   15,997
Debt securities at fair value through profit or loss    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 568,501 23,247,329
Derivatives    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 257,587 24,496
Other financial assets    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 1,101,531 23,181
Other debt securities    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 7,171,171 173,134
Financial assets in guarantee    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 4,924,540 2,896,049
Investments in Equity Instruments    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 14,579 16,005
Liabilities at fair value through profit or loss    
Disclosure of fair value measurement of assets and liability [line items]    
Financial liabilities 189,554 412,403
Derivative instruments    
Disclosure of fair value measurement of assets and liability [line items]    
Financial liabilities   144,944
Other financial liabilities    
Disclosure of fair value measurement of assets and liability [line items]    
Financial liabilities 5,996,738 4,472,991
Financing received from the Argentine Central Bank and other financial institutions    
Disclosure of fair value measurement of assets and liability [line items]    
Financial liabilities   23,023
Level 1 of fair value hierarchy [member]    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 14,055,365 8,896,688
Financial liabilities 6,186,292 4,908,417
Level 1 of fair value hierarchy [member] | Cash and due from banks    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets   15,997
Level 1 of fair value hierarchy [member] | Debt securities at fair value through profit or loss    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 564,830 5,761,365
Level 1 of fair value hierarchy [member] | Derivatives    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 257,587 24,496
Level 1 of fair value hierarchy [member] | Other financial assets    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 1,101,531 23,181
Level 1 of fair value hierarchy [member] | Other debt securities    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 7,171,171 173,134
Level 1 of fair value hierarchy [member] | Financial assets in guarantee    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 4,924,540 2,896,049
Level 1 of fair value hierarchy [member] | Investments in Equity Instruments    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 5,796 2,466
Level 1 of fair value hierarchy [member] | Liabilities at fair value through profit or loss    
Disclosure of fair value measurement of assets and liability [line items]    
Financial liabilities 189,554 412,403
Level 1 of fair value hierarchy [member] | Other financial liabilities    
Disclosure of fair value measurement of assets and liability [line items]    
Financial liabilities 5,996,738 4,472,991
Level 1 of fair value hierarchy [member] | Financing received from the Argentine Central Bank and other financial institutions    
Disclosure of fair value measurement of assets and liability [line items]    
Financial liabilities   23,023
Level 2 of fair value hierarchy [member]    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 8,783 17,499,503
Financial liabilities   144,944
Level 2 of fair value hierarchy [member] | Debt securities at fair value through profit or loss    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets   17,485,964
Level 2 of fair value hierarchy [member] | Investments in Equity Instruments    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 8,783 13,539
Level 2 of fair value hierarchy [member] | Derivative instruments    
Disclosure of fair value measurement of assets and liability [line items]    
Financial liabilities   $ 144,944
Level 3 of fair value hierarchy [member]    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets 3,671  
Level 3 of fair value hierarchy [member] | Debt securities at fair value through profit or loss    
Disclosure of fair value measurement of assets and liability [line items]    
Financial assets $ 3,671