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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

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