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FAIR VALUES - Fair Equity Instruments (Details) - ARS ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value measurement of assets and liability [line items]      
Equity instruments measured at Fair Value with changes in profit or loss $ 568,501 $ 23,247,329 $ 25,902,184
Equity investments      
Disclosure of fair value measurement of assets and liability [line items]      
Equity instruments measured at Fair Value with changes in profit or loss 5,796 2,466  
YPF S.A.      
Disclosure of fair value measurement of assets and liability [line items]      
Equity instruments measured at Fair Value with changes in profit or loss   1,665  
Grupo Financiero Galicia S.A.      
Disclosure of fair value measurement of assets and liability [line items]      
Equity instruments measured at Fair Value with changes in profit or loss $ 5,796 $ 801