RISK MANAGEMENT - Structural interest rate risk - Accounting sensitivity exercise (Details) - COP ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of risk management [abstract] | ||
| Accounting sensitivity exercise to variations in interest rates, basis point increase (as a percent) | 1.00% | |
| Accounting sensitivity exercise to variations in interest rates, 100 basis point increase, net income before income tax expense, increase (decrease), amount | $ 83,572 | $ 33,715 |
| Accounting sensitivity exercise to variations in interest rates, 100 basis point increase, net income before income tax expense, increase (decrease), percentage (as a percent) | 1.10% | 0.46% |
| Accounting sensitivity exercise to variations in interest rates, 100 basis point increase, other comprehensive income (loss) in equity, amount | $ 835,812 | $ 868,462 |