XML 161 R146.htm IDEA: XBRL DOCUMENT v3.21.1

Related Parties - Composition of Board of Directors and Key Management Personnel (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of transactions between related parties [line items]
Number of board of directors and key management personnel	33	34
Board Of Directors [member]
Disclosure of transactions between related parties [line items]
Number of board of directors and key management personnel	22	24
Senior managers of key management personnel [member]
Disclosure of transactions between related parties [line items]
Number of board of directors and key management personnel	11	10

X

- Definition

Number of board of directors and key management personnel.

+ References

No definition available.

+ Details

Name:	bma_NumberOfBoardOfDirectorsAndKeyManagementPersonnel
Namespace Prefix:	bma_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

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

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=bma_BoardOfDirectorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=bma_SeniorManagersOfKeyManagementPersonnelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: