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Financial assets at fair value through profit or loss - Equity Instruments (Detail) - ARS ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Investments In Equity Instruments [Line Items]    
TOTAL $ 4,152,821 $ 812,275
Prisma Medios de Pago S.A    
Disclosure Of Investments In Equity Instruments [Line Items]    
TOTAL 3,033,010  
Mercado de Valores de Buenos Aires S.A.    
Disclosure Of Investments In Equity Instruments [Line Items]    
TOTAL 80,375 38,030
BYMA-Bolsas y Mercados Argentinos S.A.    
Disclosure Of Investments In Equity Instruments [Line Items]    
TOTAL 62,859 145,525
Investment Funds    
Disclosure Of Investments In Equity Instruments [Line Items]    
TOTAL $ 976,577 $ 628,720