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Investment Portfolio - Government and Corporate Securities - Summary of Investments In Argentine And Other Governments And Corporate Securities (Details) - ARS ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Government Securities [Abstract] |  |  |
Government debt instruments held | $ 189,641,591 | $ 193,504,512 | $ 101,059,150
Investment Funds [Abstract] |  |  |
Investment Funds Equity | 1,905,039 | 2,221,661 | 2,006,796
Listed Securities [Member] |  |  |
Corporate Securities [Abstract] |  |  |
Corporate debt instruments held | 36,083 | 43,018 | 56,242
Unlisted Securities [Member] |  |  |
Corporate Securities [Abstract] |  |  |
Corporate debt instruments held | 1,360,297 | 435,237 | 6,863,623
Pesos [Member] |  |  |
Government Securities [Abstract] |  |  |
Government debt instruments held | 188,023,228 | 193,504,405 | 85,966,533
Foreign Currency [Member] |  |  |
Government Securities [Abstract] |  |  |
Government debt instruments held | 1,618,363 | 107 | 15,092,617
Argentine Government bonds [Member] | Pesos [Member] |  |  |
Government Securities [Abstract] |  |  |
Government debt instruments held | 65,998,096 | 56,441,307 | 17,921,948
Argentine Government bonds [Member] | Foreign Currency [Member] |  |  |
Government Securities [Abstract] |  |  |
Government debt instruments held | 1,618,363 | 107 | 0
Argentine Treasury bills [Member] | Pesos [Member] |  |  |
Government Securities [Abstract] |  |  |
Government debt instruments held | 14,331,804 | 1,381,496 | 0
Argentine Treasury bills [Member] | Foreign Currency [Member] |  |  |
Government Securities [Abstract] |  |  |
Government debt instruments held | 0 | 0 | 15,092,617
Other debt securities [Member] | Pesos [Member] |  |  |
Government Securities [Abstract] |  |  |
Government debt instruments held | 0 | 0 | 106,249
Liquidity Bills issued by the BCRA [Member] | Pesos [Member] |  |  |
Government Securities [Abstract] |  |  |
Government debt instruments held | 107,693,328 | 135,681,602 | 67,938,336
Trading equity securities [member] | Listed Securities [Member] |  |  |
Corporate Securities [Abstract] |  |  |
Corporate debt instruments held | 36,083 | 43,018 | 56,242
Trading equity securities [member] | Unlisted Securities [Member] |  |  |
Corporate Securities [Abstract] |  |  |
Corporate debt instruments held | 0 | 0 | 6,526,952
Debt securities [member] | Unlisted Securities [Member] |  |  |
Corporate Securities [Abstract] |  |  |
Corporate debt instruments held | $ 1,360,297 | $ 435,237 | $ 336,671

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