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ESTIMATION OF FAIR VALUE - Reconciliation Level 3 of the fair value hierarchy - Additional information (Details) - COP ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Banco de Bogota S.A.      
Disclosure of fair value measurement of assets [line items]      
Additions $ 1,199    
Banco de Bogota S.A.      
Disclosure of fair value measurement of assets [line items]      
Additions 147,790 $ 466,210  
Sales/redemptions   $ 39,348  
Banco de Bogota S.A. | BAC Holding International Corp      
Disclosure of fair value measurement of assets [line items]      
Percentage of shares sold   4.10%  
Banco de Occidente S.A.      
Disclosure of fair value measurement of assets [line items]      
Additions 58,295 $ 60,947  
Sales/redemptions   37,970  
Banco Popular S.A.      
Disclosure of fair value measurement of assets [line items]      
Additions 106,320 249,732  
Sales/redemptions   6,602  
Banco AV Villas S A      
Disclosure of fair value measurement of assets [line items]      
Additions 11,815 53,829  
Sales/redemptions   2,730  
BAC Holding International Corp      
Disclosure of fair value measurement of assets [line items]      
Sales/redemptions   519,964  
Promigas S.A. E.S.P.      
Disclosure of fair value measurement of assets [line items]      
Additions 1,876    
Equity securities | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of fair value measurement of assets [line items]      
Additions 326,096 830,718 $ 918,046
Sales/redemptions $ 1,199 $ 606,614 $ 13,062