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Accounting Items That Identify the Compliance With Minimum Cash Requirements - Summary of Minimum Cash Requirement Constitute by Bank (Detail) - Banco Macro SA [member] $ in Thousands | Dec. 31, 2020 ARS ($)
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Disclosure of accounts showing compliance with minimum cash requirements [line items] |
Cash requirement constitute by bank | $ 126,977,345
BCRA accounts [member] | Cash and deposits in banks [member] |
Disclosure of accounts showing compliance with minimum cash requirements [line items] |
Cash requirement constitute by bank | 49,994,923
Central bank bills [member] | Other debt securities 1 [member] |
Disclosure of accounts showing compliance with minimum cash requirements [line items] |
Cash requirement constitute by bank | 47,216,670
Government securities [member] | Other debt securities 1 [member] |
Disclosure of accounts showing compliance with minimum cash requirements [line items] |
Cash requirement constitute by bank | 17,725,006
Special guarantees accounts in the BCRA [member] | Financial assets delivered as guarantee [member] |
Disclosure of accounts showing compliance with minimum cash requirements [line items] |
Cash requirement constitute by bank | $ 12,040,746

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- Definition cash requirement constitute by bank. + References No definition available. + Details
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Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent the accounts showing compliance with minimum cash requirements. + References No definition available. + Details
Name: | bma_DisclosureOfAccountsShowingComplianceWithMinimumCashRequirementsLineItems
Namespace Prefix: | bma_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=bma_BancoMacroSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RegulatoryDeferralAccountBalancesAxis=bma_BCRAAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfRegulatoryDeferralAccountBalancesAxis=bma_CashAndDepositsInBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RegulatoryDeferralAccountBalancesAxis=bma_BCRAInternalBillsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfRegulatoryDeferralAccountBalancesAxis=bma_OtherDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RegulatoryDeferralAccountBalancesAxis=bma_GovernmentSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RegulatoryDeferralAccountBalancesAxis=bma_SpecialGuaranteesAccountsInTheBCRAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfRegulatoryDeferralAccountBalancesAxis=bma_FinancialAssetsDeliveredAsGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |