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RISK MANAGEMENT - Concentrations of credit risk - Concentration by sector (Details) - COP ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 304,853,883 | $ 280,746,878 |  |
Financial assets at amortised cost, category [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | 251,981,889 | 236,970,165 |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | 190,129,486 | 176,168,055 |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 200,136,125 | $ 186,203,770 | $ 188,313,361 | $ 231,573,437
Concentration risk, percentage, financial assets (as a percent) | 100.00% | 100.00% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Consumer services |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 89,687,446 | $ 84,358,141 |  |
Concentration risk, percentage, financial assets (as a percent) | 44.80% | 45.30% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Commercial services |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 43,792,710 | $ 40,341,863 |  |
Concentration risk, percentage, financial assets (as a percent) | 21.90% | 21.70% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | IFRS Construction [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 15,046,109 | $ 14,733,390 |  |
Concentration risk, percentage, financial assets (as a percent) | 7.50% | 7.90% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Food, beverage and tobacco |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 7,577,678 | $ 7,191,477 |  |
Concentration risk, percentage, financial assets (as a percent) | 3.80% | 3.90% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Other industrial and manufacturing products |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 6,857,011 | $ 6,410,022 |  |
Concentration risk, percentage, financial assets (as a percent) | 3.40% | 3.40% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Transportation and communications |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 6,499,070 | $ 6,283,172 |  |
Concentration risk, percentage, financial assets (as a percent) | 3.20% | 3.40% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Public services |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 9,218,309 | $ 7,172,123 |  |
Concentration risk, percentage, financial assets (as a percent) | 4.60% | 3.90% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Chemical production |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 5,539,036 | $ 5,414,605 |  |
Concentration risk, percentage, financial assets (as a percent) | 2.80% | 2.90% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Government |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 5,471,013 | $ 5,367,471 |  |
Concentration risk, percentage, financial assets (as a percent) | 2.70% | 2.90% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Agricultural |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 4,538,856 | $ 4,192,847 |  |
Concentration risk, percentage, financial assets (as a percent) | 2.30% | 2.30% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Trade and tourism |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 1,724,337 | $ 1,622,212 |  |
Concentration risk, percentage, financial assets (as a percent) | 0.90% | 0.80% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Mining products and oil |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 2,754,170 | $ 1,500,686 |  |
Concentration risk, percentage, financial assets (as a percent) | 1.40% | 0.80% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Other [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 1,430,380 | $ 1,615,761 |  |
Concentration risk, percentage, financial assets (as a percent) | 0.70% | 0.80% |  |

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