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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, 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 241,200,000 7,700,000  
Total capital stock 100.00% 100.00%  
Voting rights 100.00% 100.00%  
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%