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Cover Pages
 12 Months Ended
Dec. 31, 2020
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2020
Document Fiscal Year Focus 2020
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
ICFR Auditor Attestation Flag true
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