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CUSTOMER DEPOSITS - Concentration of deposits received (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of customer deposits [line items]    
Customer deposits $ 181,987,396 $ 173,341,149
Concentrations of deposits, percentage 100.00% 100.00%
Financial [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 33,873,473 $ 29,871,901
Concentrations of deposits, percentage 18.60% 17.20%
Individuals [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 32,755,163 $ 36,618,776
Concentrations of deposits, percentage 18.00% 21.10%
Government and Colombian Government entities [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 20,927,670 $ 19,655,737
Concentrations of deposits, percentage 11.50% 11.30%
Services [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 17,303,980 $ 16,143,899
Concentrations of deposits, percentage 9.50% 9.30%
Insurance [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 10,619,085 $ 10,206,023
Concentrations of deposits, percentage 5.80% 5.90%
Commerce [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 10,390,440 $ 10,030,824
Concentrations of deposits, percentage 5.70% 5.80%
Real estates [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 9,252,682 $ 3,109,595
Concentrations of deposits, percentage 5.10% 1.80%
Manufacturing [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 3,753,556 $ 3,689,037
Concentrations of deposits, percentage 2.10% 2.10%
Agriculture and livestock [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 2,210,914 $ 2,314,989
Concentrations of deposits, percentage 1.20% 1.30%
Education [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 1,794,592 $ 1,438,654
Concentrations of deposits, percentage 1.00% 0.80%
Transport [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 1,523,858 $ 1,849,662
Concentrations of deposits, percentage 0.80% 1.10%
Exploitation of mines and quarries [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 1,071,957 $ 1,700,628
Concentrations of deposits, percentage 0.60% 1.00%
Colombian municipalities [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 635,410 $ 433,063
Concentrations of deposits, percentage 0.30% 0.20%
Artistic, entertainment and recreation activities [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 316,956 $ 1,035,984
Concentrations of deposits, percentage 0.20% 0.60%
Foreign governments [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 269,659 $ 425,450
Concentrations of deposits, percentage 0.10% 0.20%
Telecommunications [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 234,786 $ 895,281
Concentrations of deposits, percentage 0.10% 0.50%
Tourism [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 86,661 $ 25
Concentrations of deposits, percentage 0.10% 0.10%
Other [member]    
Disclosure of customer deposits [line items]    
Customer deposits $ 34,966,554 $ 33,921,621
Concentrations of deposits, percentage 19.30% 19.70%