XML 143 R128.htm IDEA: XBRL DOCUMENT
v3.21.1

Fair Value Quantitative and Qualitative Disclosures - Summary of Valuation Techniques and Significant Unobservable Inputs Used in the Valuation (Detail) - Discounted cash flow [member] $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 ARS ($) | Dec. 31, 2019 ARS ($)
Debt securities of financial trusts [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Fair value of Level 3 Assets |  | $ 259,482
Valuation technique |  | Income approach (discounted cash flow)
Significant unobservable inputs |  | Discount rate in pesos
Debt securities of financial trusts provisional [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Fair value of Level 3 Assets | $ 376,090 | $ 847,773
Valuation technique | Income approach (discounted cash flow) | Income approach (discounted cash flow)
Significant unobservable inputs | Discount rate in pesos | Discount rate in pesos
Minimum Average Term [member] | Debt securities of financial trusts [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Off range of inputs high |  | 48.50
Minimum Average Term [member] | Debt securities of financial trusts provisional [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Off range of inputs high | 43.84 | 39.27
Maximum Average Term [member] | Debt securities of financial trusts [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Off range of inputs high |  | 74.06
Maximum Average Term [member] | Debt securities of financial trusts provisional [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Off range of inputs high | 47.60 | 44.97

X
- Definition Descriptionof significant unobservable inputs in fair value measurement financial assets and financial liabilities. + References No definition available. + Details
Name: | bma_DescriptionofSignificantUnobservableInputsInFairValueMeasurementFinancialAssetsAndFinancialLiabilities
Namespace Prefix: | bma_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of level 3 assets. + References No definition available. + Details
Name: | bma_FairValueOfLevel3Assets
Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The description of the valuation techniques (for example, the market approach, cost approach and income approach) used for the fair value measurement of assets. [Refer: Valuation techniques [member]; Cost approach [member]; Income approach [member]; Market approach [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_d&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_DescriptionOfValuationTechniquesUsedInFairValueMeasurementAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
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_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value of significant unobservable input used in the measurement of the fair value of assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_d&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_SignificantUnobservableInputAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_ValuationTechniquesUsedInFairValueMeasurementAxis=ifrs-full_DiscountedCashFlowMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=bma_DebtSecuritiesOfFinancialTrustsMember
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: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |