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CUSTOMER DEPOSITS - Concentration of deposits received (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of customer deposits [line items]    
Customer deposits $ 200,872,177 $ 181,987,396
Concentrations of deposits, percentage 100.00% 100.00%
Financial [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 36,117,236 $ 33,873,473
Concentrations of deposits, percentage 18.00% 18.60%
Individuals [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 31,559,768 $ 27,986,764
Concentrations of deposits, percentage 15.70% 15.40%
Financial and insurance activities [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 19,700,240 $ 21,194,553
Concentrations of deposits, percentage 9.80% 11.60%
Government and Colombian Government entities [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 26,875,424 $ 25,696,069
Concentrations of deposits, percentage 13.40% 14.10%
Services [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 19,280,845 $ 17,303,980
Concentrations of deposits, percentage 9.60% 9.50%
Insurance [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 14,226,539 $ 10,619,085
Concentrations of deposits, percentage 7.10% 5.80%
Commerce [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 12,680,110 $ 10,390,440
Concentrations of deposits, percentage 6.30% 5.70%
Real estates [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 3,418,132 $ 9,252,682
Concentrations of deposits, percentage 1.70% 5.10%
Manufacturing [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 3,056,218 $ 3,753,556
Concentrations of deposits, percentage 1.50% 2.10%
Education [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 1,793,395 $ 1,794,592
Concentrations of deposits, percentage 0.90% 1.00%
Agriculture and livestock [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 1,556,711 $ 2,210,914
Concentrations of deposits, percentage 0.80% 1.20%
Exploitation of mines and quarries [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 1,226,516 $ 1,071,957
Concentrations of deposits, percentage 0.60% 0.60%
Foreign governments [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 867,311 $ 269,659
Concentrations of deposits, percentage 0.40% 0.10%
Colombian municipalities [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 604,265 $ 635,410
Concentrations of deposits, percentage 0.30% 0.30%
Artistic, entertainment and recreation activities [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 454,909 $ 316,956
Concentrations of deposits, percentage 0.20% 0.20%
Transport [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 287,384 $ 1,523,858
Concentrations of deposits, percentage 0.10% 0.80%
Telecommunications [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 217,656 $ 234,786
Concentrations of deposits, percentage 0.10% 0.10%
Tourism [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 83,289 $ 86,661
Concentrations of deposits, percentage 0.10% 0.10%
Other [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 26,866,229 $ 13,772,001
Concentrations of deposits, percentage 13.40% 7.70%