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RISK MANAGEMENT - Structural foreign exchange risk - Results of Delta EVE and Delta NIM measurements (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
COP ($)
Interest rate risk [member]  
Disclosure of risk management strategy related to hedge accounting [line items]  
Percentage of ordinary basic equity and additional basic equity 15.00%
Banco de Bogota S.A.  
Disclosure of risk management strategy related to hedge accounting [line items]  
Maximum Delta MNI $ (692,350)
Maximum Delta VEP $ (1,216,132)
Delta VEP / PBO+PBA 8.57%
Banco de Occidente S.A.  
Disclosure of risk management strategy related to hedge accounting [line items]  
Maximum Delta MNI $ (538,969)
Maximum Delta VEP $ (331,065)
Delta VEP / PBO+PBA 7.17%
Banco Popular S.A.  
Disclosure of risk management strategy related to hedge accounting [line items]  
Maximum Delta MNI $ (328,276)
Maximum Delta VEP $ (408,513)
Delta VEP / PBO+PBA 21.00%
Banco AV Villas  
Disclosure of risk management strategy related to hedge accounting [line items]  
Maximum Delta MNI $ (141,779)
Maximum Delta VEP $ (136,325)
Delta VEP / PBO+PBA 10.87%