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Restricted Assets - Summary of Restricted Assets (Parenthetical) (Detail) - Fintech SGR [Member] $ in Thousands | Nov. 09, 2020 ARS ($)
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Disclosure of restricted assets [line items] |
Cash payments for call options | $ 12,638
Percentage rights in capital stock acquired | 24.99%

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- Definition Cash payments for call options. + References No definition available. + Details
Name: | bma_CashPaymentsForCallOptions
Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of restricted assets [line items] + References No definition available. + Details
Name: | bma_DisclosureOfRestrictedAssetsLineItems
Namespace Prefix: | bma_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage rights in capital stock acquired. + References No definition available. + Details
Name: | bma_PercentageRightsInCapitalStockAcquired
Namespace Prefix: | bma_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=bma_FintechSGRMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |