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Changes in the Argentine Macroeconomic Environment of the Financial and Capital Markets - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2019
Financial And Capital Markets [Line Items] |  |
Percentage Of Increase Decrease In Foreign Currency | 0.00% | 70.00%

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- References No definition available. + Details
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Namespace Prefix: | bma_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Percentage Of Increase Decrease In Foreign Currency. + References No definition available. + Details
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Namespace Prefix: | bma_
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Balance Type: | na
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