XML 144 R129.htm IDEA: XBRL DOCUMENT
v3.21.1

Fair Value Quantitative and Qualitative Disclosures - Summary of Effect of Changing the Significant Unobservable Inputs (Detail) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt securities of financial trusts [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Favorable changes |  | $ 5,654
Unfavorable changes |  | (5,000)
Debt securities of financial trusts provisional [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Favorable changes | $ 450 | 1,083
Unfavorable changes | $ (439) | $ (1,057)

X
- Definition Favorable changes in fair value. + References No definition available. + Details
Name: | bma_FavourableChangesInFairValue
Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unfavorable changes in fair value. + References No definition available. + Details
Name: | bma_UnfavorableChangesInFairValue
Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=bma_DebtInterestsInSecuritiesInFinancialTrustsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=bma_DebtSecuritiesOfFinancialTrustsProvisionalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |