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RISK MANAGEMENT - Risk management - Regulatory (Details) - Measure Trading Risk Method - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Banco de Bogota S.A.    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 639,228 $ 759,624
Basis points of regulatory capital (as a percent) 1.11% 1.16%
Banco de Occidente S.A.    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 218,355 $ 272,515
Basis points of regulatory capital (as a percent) 0.67% 0.90%
Banco Popular S.A.    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 336,718 $ 147,685
Basis points of regulatory capital (as a percent) 1.85% 1.16%
Banco Comercial AV Villas S.A.    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 47,004 $ 96,711
Basis points of regulatory capital (as a percent) 0.55% 1.05%
Corficolombiana    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 240,068 $ 190,534
Basis points of regulatory capital (as a percent) 5.19% 4.84%
Sociedad Administradora de Fondos de Pensiones y Cesantias Porvenir S.A.    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 10,927 $ 13,808
Basis points of regulatory capital (as a percent) 0.92% 1.48%