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Restricted Assets - Summary of Restricted Assets (Parenthetical) (Detail) - Fintech SGR [Member] $ in Thousands	Nov. 09, 2020 ARS ($)
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

X

- Definition

Disclosure of restricted assets [line items]

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No definition available.

+ Details

Name:	bma_DisclosureOfRestrictedAssetsLineItems
Namespace Prefix:	bma_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Details

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