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LOANS - Interest income by portfolio (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of financial assets [line items]      
Total interest income $ 26,534,115 $ 17,559,516 $ 11,882,144
Commercial lending portfolio [member]      
Disclosure of financial assets [line items]      
Total interest income 14,497,926 8,608,592 4,698,563
Loans to consumers [member]      
Disclosure of financial assets [line items]      
Total interest income 9,208,508 7,048,747 5,890,691
Mortgage [member]      
Disclosure of financial assets [line items]      
Total interest income 1,687,962 1,349,898 1,080,022
Microcredit [member]      
Disclosure of financial assets [line items]      
Total interest income 71,352 64,582 77,880
Repos, interbank loans portfolio [member]      
Disclosure of financial assets [line items]      
Total interest income $ 1,068,367 $ 487,697 $ 134,988