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RISK MANAGEMENT - Risk management - Value at risk - Additional information (Details) - Market risk [member]
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Banco de Bogota S.A.    
Disclosure of financial assets [line items]    
Market risk weighted assets as a percentage of total risk weighted assets 6.70% 8.10%
Banco de Occidente S.A.    
Disclosure of financial assets [line items]    
Market risk weighted assets as a percentage of total risk weighted assets 5.20% 7.00%
Banco Comercial AV Villas S.A.    
Disclosure of financial assets [line items]    
Market risk weighted assets as a percentage of total risk weighted assets 4.50% 8.70%
Banco Popular S.A.    
Disclosure of financial assets [line items]    
Market risk weighted assets as a percentage of total risk weighted assets 8.80% 7.70%
Corficolombiana S.A    
Disclosure of financial assets [line items]    
Market risk weighted assets as a percentage of total risk weighted assets 10.20% 8.90%
Sociedad Administradora de Fondos de Pensiones y Cesantias Porvenir S.A.    
Disclosure of financial assets [line items]    
Market risk weighted assets as a percentage of total risk weighted assets 13.70% 16.90%