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Operations of the Bank - Additional Information (Detail) - ARS ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Misiones Provincial Government [member] |  |
Discription Of Business And Nature Of Operation [line items] |  |
Deposits liability | $ 9,072,397 | $ 24,512,527
Deposits liability related to court deposits | 1,035,931 | 1,220,469
Salta Provincial Government [member] |  |
Discription Of Business And Nature Of Operation [line items] |  |
Deposits liability | 6,455,729 | 5,701,168
Deposits liability related to court deposits | 2,200,818 | 1,873,083
Jujuy Provincial Government [member] |  |
Discription Of Business And Nature Of Operation [line items] |  |
Deposits liability | 8,427,277 | 16,468,955
Deposits liability related to court deposits | 1,908,871 | 1,763,629
Banco del Tucuman SA [member] |  |
Discription Of Business And Nature Of Operation [line items] |  |
Deposits liability | 17,504,996 | 21,546,127
Deposits liability related to court deposits | 5,129,863 | 5,338,406
Bank granted loans to government | $ 1,838,221 | $ 4,317,862

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- Definition The amount of deposit held by the entity from Provincial Governments. + References No definition available. + Details
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Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Deposits liability related to court deposits. + References No definition available. + Details
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Namespace Prefix: | bma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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Namespace Prefix: | bma_
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- Definition The amount of loans to government made by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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- Details
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Namespace Prefix: |
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- Details
Name: | ifrs-full_CounterpartiesAxis=bma_SaltaProvincialGovernmentMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=bma_JujuyProvincialGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=bma_BancoDelTucumanSAMember
Namespace Prefix: |
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Balance Type: |
Period Type: |