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Deposit Guarantee Insurance - Additional Information (Detail) - ARS ($) $ in Thousands	Feb. 27, 2020	Dec. 31, 2020
Disclosure Of Guarantees [line items]
Deposit amount		$ 1,500
BCRA Communique B [member]
Disclosure Of Guarantees [line items]
Interest in the capital stock	8.418%

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- Definition

Deposits.

+ References

No definition available.

+ Details

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Namespace Prefix:	bma_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Disclosure Of Guarantees [line items]

+ References

No definition available.

+ Details

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

X

- Definition

percentage capital interest.

+ References

No definition available.

+ Details

Name:	bma_PercentageCapitalInterest
Namespace Prefix:	bma_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	bma_CapitalManagementAxis=bma_BCRACommuniqueBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: