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LOANS AND OTHER FINANCING - Withdrawal of financial assets from its balance sheet (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
LOANS AND OTHER FINANCING      
Contractual amounts pending of collection of such withdrawn assets     $ 7,198,080
Balance at the beginning of the year $ 5,240,360 $ 3,614,921  
Additions 5,788,119 6,113,008  
Disposals (1,229,014) (1,666,458)  
Cash colletion (550,119) (631,103)  
Portfolio sales (77,117) (61,979)  
Condonation (601,778) (973,376)  
Exchange differences and other movements (2,601,385) (2,821,111)  
Gross carrying amount $ 7,198,080 $ 5,240,360