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LOANS - Interest income by portfolio (Details) - COP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of financial assets [line items] |  |  |
Total interest income | $ 25,465,582 | $ 26,534,115 | $ 17,559,516
Banco de Occidente S.A. |  |  |
Disclosure of financial assets [line items] |  |  |
Interest income of the derivative designated as the hedging instrument | 595 |  |
Commercial - Client portfolio |  |  |
Disclosure of financial assets [line items] |  |  |
Total interest income | 13,572,183 | 14,497,926 | 8,608,592
Consumer |  |  |
Disclosure of financial assets [line items] |  |  |
Total interest income | 9,127,660 | 9,208,508 | 7,048,747
Mortgage |  |  |
Disclosure of financial assets [line items] |  |  |
Total interest income | 1,947,812 | 1,687,962 | 1,349,898
Microcredit |  |  |
Disclosure of financial assets [line items] |  |  |
Total interest income | 48,710 | 71,352 | 64,582
Repos, interbank loans portfolio |  |  |
Disclosure of financial assets [line items] |  |  |
Total interest income | 769,217 | $ 1,068,367 | $ 487,697
Iinterest income of cash and cash equivalents | $ 584,748 |  |

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