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Financial Assets Delivered as Guarantee - Summary of Financial Assets Delivered as Guarantee (Detail) - ARS ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Guaranteed financial assets $ 14,292,358 $ 14,530,739
For transactions with the BCRA [member]    
Disclosure of financial assets [line items]    
Guaranteed financial assets 12,040,746 10,127,017
For guarantee deposits [member]    
Disclosure of financial assets [line items]    
Guaranteed financial assets 1,555,864 2,937,377
For securities forward contracts [member]    
Disclosure of financial assets [line items]    
Guaranteed financial assets $ 695,748 $ 1,466,345