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v3.21.1

Related Parties - Composition of Board of Directors and Key Management Personnel (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of transactions between related parties [line items] |  |
Number of board of directors and key management personnel | 33 | 34
Board Of Directors [member] |  |
Disclosure of transactions between related parties [line items] |  |
Number of board of directors and key management personnel | 22 | 24
Senior managers of key management personnel [member] |  |
Disclosure of transactions between related parties [line items] |  |
Number of board of directors and key management personnel | 11 | 10

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- Definition Number of board of directors and key management personnel. + References No definition available. + Details
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Namespace Prefix: | bma_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=bma_BoardOfDirectorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=bma_SeniorManagersOfKeyManagementPersonnelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |