XML 127 R112.htm IDEA: XBRL DOCUMENT
v3.21.1

Other Debt Securities - Additional Information (Detail) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Government Securities [member] |  |
Disclosure of other debt securities at fair value through profit or loss [line items] |  |
Unrealised Gain | $ 445,822 | $ 644
Unrealised Loss | (68,438) | (618,033)
Central Bank Bills [member] |  |
Disclosure of other debt securities at fair value through profit or loss [line items] |  |
Unrealised Loss | $ (185,277) | $ (80,771)

X
- Definition Disclosure of other debt securities at fair value through profit or loss [line items] + References No definition available. + Details
Name: | bma_DisclosureOfOtherDebtSecuritiesAtFairValueThroughProfitOrLossLineItems
Namespace Prefix: | bma_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Unrealised Gain. + References No definition available. + Details
Name: | bma_UnrealisedGain
Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unrealised Loss. + References No definition available. + Details
Name: | bma_UnrealisedLoss
Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=bma_GovernmentSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=bma_CentralBankBillsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |