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Financial assets at fair value through profit or loss - Equity Instruments (Detail) - ARS ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Investments In Equity Instruments [Line Items]    
TOTAL $ 7,795,950 $ 5,653,673
Prisma Medios de Pago S.A    
Disclosure Of Investments In Equity Instruments [Line Items]    
TOTAL 6,033,808 4,129,157
Mercado de Valores de Buenos Aires S.A.    
Disclosure Of Investments In Equity Instruments [Line Items]    
TOTAL 154,000 109,423
BYMA-Bolsas y Mercados Argentinos S.A.    
Disclosure Of Investments In Equity Instruments [Line Items]    
TOTAL 136,274 85,576
Investment Funds    
Disclosure Of Investments In Equity Instruments [Line Items]    
TOTAL $ 1,471,868 $ 1,329,517