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RISK MANAGEMENT - Liquidity risk - Liquid assets and LRI (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Banco de Bogota S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets $ 13,469,768 $ 11,924,823
Banco de Occidente S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 9,284,616 8,638,565
Banco Popular S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 4,030,595 4,896,134
Banco Comercial AV Villas S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 2,145,763 2,328,186
Corporacion Financiera Colombiana S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 1,908,014 2,073,055
Aval Fiduciaria S.A    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 18,675 30,428
Aval Casa de Bolsa S.A    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 23,450 28,710
Later than one day and not later than seven days [member] | Banco de Bogota S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 10,953,748 9,811,253
Later than one day and not later than seven days [member] | Banco de Occidente S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 6,461,637 6,727,345
Later than one day and not later than seven days [member] | Banco Popular S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 3,580,936 4,641,802
Later than one day and not later than seven days [member] | Banco Comercial AV Villas S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 1,665,301 2,027,630
Later than one day and not later than seven days [member] | Corporacion Financiera Colombiana S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 902,572 1,138,855
Later than one day and not later than seven days [member] | Aval Fiduciaria S.A    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 11,010 13,512
Later than one day and not later than seven days [member] | Aval Casa de Bolsa S.A    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 19,637 26,796
Not later than one month [member] | Banco de Bogota S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 2,928,936 2,568,828
Not later than one month [member] | Banco de Occidente S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 2,946,224 2,531,186
Not later than one month [member] | Banco Popular S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 893,612 1,525,529
Not later than one month [member] | Banco Comercial AV Villas S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 687,963 992,892
Not later than one month [member] | Corporacion Financiera Colombiana S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets 560,871 222,748
Not later than one month [member] | Aval Fiduciaria S.A    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets   1,413
Liquid assets (liabilities) (18,256)  
Later than one month and not later than three months [member] | Banco de Bogota S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets (liabilities) (16,891,633) (15,278,208)
Later than one month and not later than three months [member] | Banco de Occidente S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets (liabilities) (11,199,262) (8,473,508)
Later than one month and not later than three months [member] | Banco Popular S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets (liabilities) (5,667,658) (5,458,950)
Later than one month and not later than three months [member] | Banco Comercial AV Villas S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets (liabilities) (2,909,334) (2,408,230)
Later than one month and not later than three months [member] | Corporacion Financiera Colombiana S.A.    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Liquid assets (liabilities) $ (649,409) $ (893,740)