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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% |

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