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Leases - Additional Information (Detail) - ARS ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of finance lease and operating lease by lessor [line items]
Income for non-accrued interests	$ 303,808	$ 64,918
Expense relating to short-term leases for which recognition exemption has been used	$ 7,985	$ 8,553	$ 229,202

X

- Definition

Contingent rents recognized as incomes.

+ References

No definition available.

+ Details

Name:	bma_ContingentRentsRecognizedAsIncomes
Namespace Prefix:	bma_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Disclosure of finance lease and operating lease.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of the expense relating to short-term leases accounted for applying paragraph 6 of IFRS 16. This expense need not include the expense relating to leases with a lease term of one month or less. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2021-01-01
-Paragraph 53
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_c&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_ExpenseRelatingToShorttermLeasesForWhichRecognitionExemptionHasBeenUsed
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration