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Fair Value Quantitative and Qualitative Disclosures - Summary of Effect of Changing the Significant Unobservable Inputs (Detail) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Debt securities of financial trusts provisional [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Favorable changes | $ 154 | $ 679
Unfavorable changes | (152) | $ (663)
Corporate Bonds [Member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Favorable changes | 15,286 |
Unfavorable changes | $ (14,091) |

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- Definition Favorable changes in fair value. + References No definition available. + Details
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Period Type: | duration

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

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |