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Basis for Preparation of Financial Statements and Applicable Accounting Standards - Summary of Total Assets, Liabilities and Net Shareholders Equity (Detail) - ARS ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Basis for preparation of financial statements and applicable accounting standards [line items]    
Assets $ 774,529,063 $ 606,152,201
Liabilities 622,983,252 461,759,370
Equity attributable to the owners of the Bank 151,543,943 144,390,918
Equity attributable to non-controlling interests 1,868 1,913
Banco Macro SA [member]    
Basis for preparation of financial statements and applicable accounting standards [line items]    
Assets 754,592,917 601,950,983
Liabilities 603,048,974 457,560,065
Equity attributable to the owners of the Bank 151,543,943 144,390,918
Macro Bank Limited [member]    
Basis for preparation of financial statements and applicable accounting standards [line items]    
Assets 7,561,808 4,681,429
Liabilities 4,957,062 1,983,781
Equity attributable to the owners of the Bank 2,604,746 2,697,648
Macro Securities SA [member]    
Basis for preparation of financial statements and applicable accounting standards [line items]    
Assets 19,266,913 5,478,637
Liabilities 17,597,611 3,722,427
Equity attributable to the owners of the Bank 1,592,455 1,660,662
Equity attributable to non-controlling interests 76,847 95,548
Macro Fiducia SA [member]    
Basis for preparation of financial statements and applicable accounting standards [line items]    
Assets 88,400 87,150
Liabilities 5,380 4,280
Equity attributable to the owners of the Bank 83,020 82,870
Argenpay SAU [Member]    
Basis for preparation of financial statements and applicable accounting standards [line items]    
Assets 351,736 10,506
Liabilities 169,722 769
Equity attributable to the owners of the Bank 182,014 9,737
Eliminations [member]    
Basis for preparation of financial statements and applicable accounting standards [line items]    
Assets (7,332,711) (6,056,504)
Liabilities (2,795,497) (1,511,952)
Equity attributable to the owners of the Bank (4,462,235) (4,450,917)
Equity attributable to non-controlling interests $ (74,979) $ (93,635)