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Change in business model and significant accounting policies - Additional Information (Detail) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Significant Accounting Policies [line items] |  |  |
Significant Influence About Associates | between 20 and 50 percent |  |
Useful Lives of Buildings | as informed in the technical appraisal as of January 1, 2017 |  |
Useful Lives of Furniture and facilities | 10 years |  |
Useful Lives of Equipment | 3-5 years |  |
Useful Lives of Automobiles | 5 years |  |
Useful Lives of Information Systems | 5 years |  |
CPI | 50.94% | 36.14% | 53.83%
Financial assets at fair value through profit or loss | $ 10,616,675 | $ 19,043,485 |
Financial Assets At Amortised Cost | 564,673,086 | $ 526,958,019 |
Change in Business Model [Member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Reclassifaion from from measured at fair value through OCI to measured at to amortized cost | 22,565,485 |  |
Financial assets at fair value through profit or loss | 22,084,903 |  |
Financial Assets At Amortised Cost | 480,582 |  |
Default Amendment Change In Accounting Estimate [Member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Increase (decrease) in accounting estimate | $ 803,000 |  |
Defaulted Exposure [Member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Total Risk |  | 40.00% |
Watch List Exposure [Member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Total Risk | 20.00% |  |
Investment funds [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Economic Interest Rate | 37.00% |  |

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