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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
Mar. 17, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Banco de Bogota S.A. | BAC Holding International Corp        
Disclosure of fair value measurement of assets [line items]        
Percentage of shares sold 4.11%      
Banco de Bogota S.A.        
Disclosure of fair value measurement of assets [line items]        
Additions   $ 466,210    
Sales/redemptions   39,348    
Banco de Occidente S.A.        
Disclosure of fair value measurement of assets [line items]        
Additions   60,947    
Sales/redemptions   37,970    
Banco Popular S.A.        
Disclosure of fair value measurement of assets [line items]        
Additions   249,732    
Sales/redemptions   6,602    
Banco AV Villas S A        
Disclosure of fair value measurement of assets [line items]        
Additions   53,829    
Sales/redemptions   2,730    
BAC Holding International Corp        
Disclosure of fair value measurement of assets [line items]        
Sales/redemptions   519,964    
Equity securities | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]        
Disclosure of fair value measurement of assets [line items]        
Additions   830,718 $ 918,046 $ 3,553
Sales/redemptions   $ 606,614 $ 13,062 $ 15,665