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RISK MANAGEMENT - Credit risk model - Impairment losses (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Impairment loss $ 4,182,394 $ 2,493,148 $ 2,721,083
Loss allowance - costs and expenses of sales goods and services (51,035) (59,073) (51,064)
Financial assets at amortised cost, category [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Impairment loss 4,802,074 3,179,476 4,551,160
Financial assets at amortised cost, category [member] | Loan portfolio [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Impairment loss 4,725,410 3,100,835 4,470,862
Financial assets at amortised cost, category [member] | Commercial lending portfolio [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Impairment loss 203,061 622,783 1,468,182
Financial assets at amortised cost, category [member] | Interbank and overnight funds [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Impairment loss (1,422) (942) 1,535
Financial assets at amortised cost, category [member] | Loans to consumers [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Impairment loss 4,426,014 2,498,699 2,813,445
Financial assets at amortised cost, category [member] | Mortgage [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Impairment loss 65,856 (25,202) 170,176
Financial assets at amortised cost, category [member] | Microcredit [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Impairment loss 31,901 5,497 17,524
Financial assets at amortised cost, category [member] | Other accounts receivable at amortized cost [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Impairment loss $ 76,664 $ 78,641 $ 80,298