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Basis for Preparation of Financial Statements and Applicable Accounting Standards - Summary of Bank's Equity Interest and Voting Rights (Detail) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basis for preparation of financial statements and applicable accounting standards [line items]        
Shares issued 639,413,408   639,413,408 669,663,021
Macro securities SA [member]        
Basis for preparation of financial statements and applicable accounting standards [line items]        
Type Common Common    
Shares issued 12,776,680 12,776,680    
Total capital stock 99.925% 99.925%    
Voting rights 99.932% 99.932%    
Macro Fiducia SA [member]        
Basis for preparation of financial statements and applicable accounting standards [line items]        
Type Common Common    
Shares issued 46,935,318 46,935,318    
Total capital stock 99.046% 99.046%    
Voting rights 99.046% 99.046%    
Macro Fondos SGFCISA [member]        
Basis for preparation of financial statements and applicable accounting standards [line items]        
Type Common Common    
Shares issued 327,183 327,183    
Total capital stock 99.939% 99.939%    
Voting rights 100.00% 100.00%    
Macro Bank Limited [member]        
Basis for preparation of financial statements and applicable accounting standards [line items]        
Type Common Common    
Shares issued 39,816,899 39,816,899    
Total capital stock 99.999% 99.999%    
Voting rights 100.00% 100.00%    
Argenpay SAU [Member]        
Basis for preparation of financial statements and applicable accounting standards [line items]        
Type Common Common    
Shares issued 341,200,000 [1] 241,200,000    
Total capital stock 100.00% [1] 100.00%    
Voting rights 100.00% [1] 100.00%    
Fintech SGR (Structured entity)        
Basis for preparation of financial statements and applicable accounting standards [line items]        
Type Common      
Shares issued 119,993      
Total capital stock 24.999%      
Voting rights 24.999%      
Non-controlling interests [member] | Macro securities SA [member]        
Basis for preparation of financial statements and applicable accounting standards [line items]        
Total capital stock 0.075% 0.075%    
Voting rights 0.068% 0.068%    
Non-controlling interests [member] | Macro Fiducia SA [member]        
Basis for preparation of financial statements and applicable accounting standards [line items]        
Total capital stock 0.954% 0.954%    
Voting rights 0.954% 0.954%    
Non-controlling interests [member] | Macro Fondos SGFCISA [member]        
Basis for preparation of financial statements and applicable accounting standards [line items]        
Total capital stock 0.061% 0.061%    
Non-controlling interests [member] | Macro Bank Limited [member]        
Basis for preparation of financial statements and applicable accounting standards [line items]        
Total capital stock 0.001% 0.001%    
Non-controlling interests [member] | Fintech SGR (Structured entity)        
Basis for preparation of financial statements and applicable accounting standards [line items]        
Total capital stock 75.001%      
Voting rights 75.001%      
[1] On December 15, 2021, the Extraordinary Shareholders’ Meeting of Argenpay SAU accepted the irrevocable capital contributions for 100,000 made by Banco Macro SA, through the issuance of 100,000,000 common, registered shares, with a face value of Ps. 1.