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Off Balance Sheet Transactions - Schedule of Different Off Balance Sheet Transactions (Detail) - ARS ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of financial investments [line items] |  |  |
Custody of government and private securities and other assets held by third parties |  | $ 388,814,394 | $ 278,378,506
Preferred and other collaterals received from customers | [1] | 120,488,512 | 127,507,767
Outstanding checks not yet paid |  | 11,148,089 | 11,375,202
Checks already deposited and pending clearance |  | 8,109,217 | 5,764,262
Written-off credits |  | $ 4,992,035 | $ 6,565,815
[1] | Related to collaterals used to secure loans transactions and other financing, under the applicable rules in force on this matter.

X
- Definition Cheque deposited for pending clearance. + References No definition available. + Details
Name: | bma_ChequeDepositedForPendingClearance
Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Custody of government and private securities and other assets held by third parties. + References No definition available. + Details
Name: | bma_CustodyOfGovernmentAndPrivateSecuritiesAndOtherAssetsHeldByThirdParties
Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Disclosure of financial investments [line items] + References No definition available. + Details
Name: | bma_DisclosureOfFinancialInvestmentsLineItems
Namespace Prefix: | bma_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Outstanding cheque. + References No definition available. + Details
Name: | bma_OutstandingCheque
Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Preferred and other collaterals received from customers. + References No definition available. + Details
Name: | bma_PreferredAndOtherCollateralsReceivedFromCustomers
Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Written-off credits. + References No definition available. + Details
Name: | bma_WrittenoffCredits
Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant