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RISK MANAGEMENT - Structural interest rate risk - Accounting sensitivity exercise (Details) - COP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Disclosure of risk management [abstract] |  |
Accounting sensitivity exercise to variations in interest rates, basis point increase (as a percent) | 1.00% | 1.00%
Accounting sensitivity exercise to variations in interest rates, 100 basis point increase, net income before income tax expense, increase (decrease), amount | $ 254,981 | $ 353,827
Accounting sensitivity exercise to variations in interest rates, 100 basis point increase, net income before income tax expense, increase (decrease), percentage (as a percent) | 4.00% | 4.60%
Accounting sensitivity exercise to variations in interest rates, 100 basis point increase, other comprehensive income (loss) in equity, amount | $ 518,156 | $ 538,385

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