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v3.21.1

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, 2020 | Dec. 31, 2019
Disclosure Of Interest Rate Risk [line items] |  |
Interest rate risk | $ 6,621 | $ 8,723
Currency Exchange rate risk | 1,727 | 2,486
Price risk | $ 5,198 | $ 192

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- Definition Currency Exchange Rate Risk. + References No definition available. + Details
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Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
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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Namespace Prefix: | bma_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest rate risk of trading and investment portfolio. + References No definition available. + Details
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Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Price risk + References No definition available. + Details
Name: | bma_PriceRisk
Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration