XML 162 R147.htm IDEA: XBRL DOCUMENT
v3.21.1

Modifications of Financial Assets - Additional Information (Detail) - ARS ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 28, 2019 | Dec. 31, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
New gross carrying amount amount |  | $ 9,065,091
Modification loss on financial asset |  | $ 3,902,110
Gross carrying amount [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Gross carrying amount of the modified financial assets | $ 12,967,201 |
Period After 90 Days [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Percentage of debt amount cancelled | 15.00% |
Period After 180 Days [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Percentage of debt amount cancelled | 25.00% |

X
- Definition Percentage of debt amount cancelled. + References No definition available. + Details
Name: | bma_PercentageOfDebtAmountCancelled
Namespace Prefix: | bma_
Data Type: | num:percentItemType
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_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The gross carrying amount of financial assets that have been modified since initial recognition at a time when the loss allowance was measured at an amount equal to lifetime expected credit losses and for which the loss allowance has changed during the reporting period to an amount equal to 12-month expected credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35J -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35J_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_FinancialAssetsWithModifiedContractualCashFlowsWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesForWhichLossAllowanceChangedDuringReportingPeriodTo12monthExpectedCreditLossesGrossCarryingAmount
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The increase (decrease) in financial assets resulting from the modification of contractual cash flows. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35I -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35I_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_IncreaseDecreaseThroughModificationOfContractualCashFlowsFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of operating income (expense) that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_OtherOperatingIncomeExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=bma_PeriodAfter90DaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=bma_PeriodAfter180DaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |