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Capital Management, Corporate Governance Transparency Policy and Risk Management - Summary of Bank's VaR by type of Risks (Detail) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Interest Rate Risk [line items] |  |
Interest rate risk | $ 9,124 | $ 6,621
Currency Exchange rate risk | 7,454 | 2,607
Price risk | $ 3,719 | $ 7,846

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- Definition Currency Exchange Rate Risk. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Disclosure Of Interest Rate Risk [line items]. + References No definition available. + Details
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Balance Type: | na
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- Definition Interest rate risk of trading and investment portfolio. + References No definition available. + Details
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Balance Type: | debit
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- Definition Price risk + References No definition available. + Details
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Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration