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Financial Instruments Risks - Summary of Credit Quality Analysis of Loans and Advances (Detail) - ARS ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of internal credit grades [line items] |  |
Credit exposure | $ 971,401,776 | $ 937,124,635
Loans to consumers [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 307,780,384 | 215,070,347
Loans to corporate entities [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 194,484,377 | 325,204,319
Debt securities [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 189,604,963 | 192,516,731
Cash And Cash Equivalents [Member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 141,983,557 | 130,088,223
Reverse Repurchase Agreements |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 137,548,495 | 74,245,015
Reverse Repurchase Agreements | BCRA Repos [Member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 137,548,495 | 74,245,015
Low Risk [Member] | Loans to consumers [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 233,760,286 | 147,560,865
Low Risk [Member] | Loans to corporate entities [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 146,126,778 | 211,975,032
Low Risk [Member] | Cash And Cash Equivalents [Member] | BCRA Unrestricted Current Account |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 141,983,557 | 130,088,223
Medium Risk [Member] | Loans to consumers [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 66,480,022 | 40,038,038
Medium Risk [Member] | Loans to corporate entities [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 41,292,892 | 103,514,198
High Risk [Member] | Loans to consumers [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 1,373,163 | 23,061,160
High Risk [Member] | Loans to corporate entities [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 3,572,141 | 5,905,963
Non Performing [Member] | Loans to consumers [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 6,166,913 | 4,410,284
Non Performing [Member] | Loans to corporate entities [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 3,492,566 | 3,809,126
Corporate Bonds B [Member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 911,442 |
BCRA Liquidity Bills [Member] | Debt securities [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 107,693,328 | 135,681,602
Government securities [member] | Debt securities [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | 80,552,118 | 56,441,307
Corporate bonds [Member] | Debt securities [member] |  |
Disclosure of internal credit grades [line items] |  |
Credit exposure | $ 448,075 | $ 393,822

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