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Cover Page
 12 Months Ended
Dec. 31, 2021
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2021
Document Fiscal Year Focus 2021
Document Fiscal Period Focus FY
Entity Registrant Name Macro Bank Inc.
Entity Central Index Key 0001347426
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Shell Company false
Entity Emerging Growth Company false
Entity Address, Country AR
Document Shell Company Report false
Document Transition Report false
Document Annual Report true
Entity Interactive Data Current No
Entity Voluntary Filers No
Entity Common Stock, Shares Outstanding 639,413,408
ICFR Auditor Attestation Flag true
Auditor Name Pistrelli, Henry Martin y Asociados S.R.L.
Auditor Firm ID 1449
Auditor Location City of Buenos Aires, Buenos Aires, Argentina
Document Registration Statement false
Entity File Number 001-32827
Entity Incorporation, State or Country Code C1
Document Accounting Standard International Financial Reporting Standards
Entity Address, Address Line One Avenida Eduardo Madero 1182
Entity Address, City or Town City of Buenos Aires
Entity Address, Postal Zip Code C1106ACY
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Country AR
Entity Address, Address Line One Avenida Eduardo Madero 1172, 24th Floor
Entity Address, City or Town City of Buenos Aires
Entity Address, Postal Zip Code C1106ACY
Contact Personnel Name Jorge Francisco Scarinci
Contact Personnel Email Address jorgescarinci@macro.com.ar
Country Region 54
City Area Code 11
Local Phone Number 5222-6730
American Depositary Shares [member]  
Document Information [Line Items]  
Trading Symbol BMA
Title of 12(b) Security American Depositary Shares
Security Exchange Name NYSE
Class A Common Stock [member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 11,235,670
Class B Common Stock [member]  
Document Information [Line Items]  
Trading Symbol BMA
Title of 12(b) Security Class B ordinary shares
Security Exchange Name NYSE
Entity Common Stock, Shares Outstanding 628,177,738