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ESTIMATION OF FAIR VALUE - Reconciliation Level 3 of the fair value hierarchy - Additional information (Details) - COP ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 17, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Banco de Bogota S.A. | BAC Holding International Corp |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Percentage of shares sold | 4.11% |  |  |
Banco de Bogota S.A. |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Additions |  | $ 466,210 |  |
Sales/redemptions |  | 39,348 |  |
Banco de Occidente S.A. |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Additions |  | 60,947 |  |
Sales/redemptions |  | 37,970 |  |
Banco Popular S.A. |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Additions |  | 249,732 |  |
Sales/redemptions |  | 6,602 |  |
Banco AV Villas S A |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Additions |  | 53,829 |  |
Sales/redemptions |  | 2,730 |  |
BAC Holding International Corp |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Sales/redemptions |  | 519,964 |  |
Equity securities | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |
Additions |  | 830,718 | $ 918,046 | $ 3,553
Sales/redemptions |  | $ 606,614 | $ 13,062 | $ 15,665

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