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Financial Assets Delivered as Guarantee - Summary of Financial Assets Delivered as Guarantee (Detail) - ARS ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of financial assets [line items] |  |
Guaranteed financial assets | $ 14,292,358 | $ 14,530,739
For transactions with the BCRA [member] |  |
Disclosure of financial assets [line items] |  |
Guaranteed financial assets | 12,040,746 | 10,127,017
For guarantee deposits [member] |  |
Disclosure of financial assets [line items] |  |
Guaranteed financial assets | 1,555,864 | 2,937,377
For securities forward contracts [member] |  |
Disclosure of financial assets [line items] |  |
Guaranteed financial assets | $ 695,748 | $ 1,466,345

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- Definition Guaranteed financial assets. + References No definition available. + Details
Name: | bma_GuaranteedFinancialAssets
Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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_DisclosureOfFinancialAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=bma_BCRAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=bma_GuaranteeDepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=bma_SecuritiesForwardContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |