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COMPOSITION OF THE MAIN ITEMS OF THE CONSOLIDATED STATEMENT OF FINANCIAL POSITION AND CONSOLIDATED INCOME STATEMENT - Net income from financial instruments at fair value through profit or loss (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
COMPOSITION OF THE MAIN ITEMS OF THE CONSOLIDATED STATEMENT OF FINANCIAL POSITION AND CONSOLIDATED INCOME STATEMENT      
Income from corporate and government securities $ 2,999,989 $ 2,086,183 $ 3,828,698
Income from securities issued by the Argentine Central Bank 135,491 25,478,678 12,934,407
Derivatives 180,102 971,521 (3,547,400)
Total $ 3,315,582 $ 28,536,382 $ 13,215,705