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Financial Instruments Risks - Summary of Credit Quality Analysis of Loans and Advances (Detail) - ARS ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of internal credit grades [line items]    
Credit exposure $ 620,852,459 $ 412,536,607
Loans to consumers [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 215,450,425 212,412,471
Loans to corporate entities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 142,485,800 138,617,882
Debt securities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 127,543,852 61,506,254
Cash And Cash Equivalents [Member]    
Disclosure of internal credit grades [line items]    
Credit exposure 86,184,474  
Reverse Repurchase Agreements    
Disclosure of internal credit grades [line items]    
Credit exposure 49,187,908  
Reverse Repurchase Agreements | BCRA Repos [Member]    
Disclosure of internal credit grades [line items]    
Credit exposure 49,187,908  
Low Risk [Member] | Loans to consumers [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 140,435,130 149,850,521
Low Risk [Member] | Loans to corporate entities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 97,760,236 82,589,414
Low Risk [Member] | Cash And Cash Equivalents [Member] | BCRA Unrestricted Current Account    
Disclosure of internal credit grades [line items]    
Credit exposure 86,184,474  
Medium Risk [Member] | Loans to consumers [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 68,578,972 54,347,711
Medium Risk [Member] | Loans to corporate entities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 26,525,516 35,034,923
High Risk [Member] | Loans to consumers [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 3,912,747 3,786,990
High Risk [Member] | Loans to corporate entities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 15,278,200 14,782,028
Non Performing [Member] | Loans to consumers [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 2,523,576 4,427,249
Non Performing [Member] | Loans to corporate entities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 2,921,848 6,211,517
BCRA Liquidity Bills [Member] | Debt securities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 89,890,131 39,585,142
Government securities [member] | Debt securities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 37,392,811 21,825,609
Corporate bonds [Member] | Debt securities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure $ 260,910 $ 95,503