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REPORTING ENTITY - Textual (Details)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Banco de Bogota S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 68.93%    
Proportion of ownership interest in subsidiary 68.93% 68.93% 68.74%
Banco de Occidente S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 72.27%    
Proportion of ownership interest in subsidiary 72.27%    
Banco Popular S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 93.74%    
Proportion of ownership interest in subsidiary 93.74%    
Banco Comercial AV Villas S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 80.39%    
Proportion of ownership interest in subsidiary 79.87%    
Corporacion Financiera Colombiana S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 55.73%    
Proportion of ownership interest in subsidiary 40.53%    
Sociedad Administradora de Fondos de Pensiones y Cesantias Porvenir S.A.      
Disclosure of subsidiaries [line items]      
Proportion of voting rights held in subsidiary 100.00%    
Proportion of ownership interest in subsidiary 75.76%    
Grupo Aval Limited      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 100.00%