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RISK MANAGEMENT - Risk management - Value at risk - Additional information (Details) - Market risk [member]
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Banco de Bogota S.A.    
Disclosure of financial assets [line items]    
Market risk weighted assets as a percentage of total risk weighted assets 3.25% 6.70%
Banco de Occidente S.A.    
Disclosure of financial assets [line items]    
Market risk weighted assets as a percentage of total risk weighted assets 8.20% 5.20%
Banco Comercial AV Villas S.A.    
Disclosure of financial assets [line items]    
Market risk weighted assets as a percentage of total risk weighted assets 2.10% 4.50%
Banco Popular S.A.    
Disclosure of financial assets [line items]    
Market risk weighted assets as a percentage of total risk weighted assets 5.61% 8.80%
Corficolombiana S.A    
Disclosure of financial assets [line items]    
Market risk weighted assets as a percentage of total risk weighted assets 13.31% 10.20%
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 2.10% 5.10%
Aval Fiduciaria S.A    
Disclosure of financial assets [line items]    
Market risk weighted assets as a percentage of total risk weighted assets 4.43% 5.19%
Aval Casa de Bolsa S.A    
Disclosure of financial assets [line items]    
Market risk weighted assets as a percentage of total risk weighted assets 60.97% 45.90%