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RISK MANAGEMENT - Credit risk model - Impairment losses (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Impairment loss $ 4,185,037 $ 4,182,394 $ 2,493,148
Loss allowance - costs and expenses of sales goods and services (71,157) (51,035) (59,073)
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 4,826,291 4,802,074 3,179,476
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 4,733,222 4,725,410 3,100,835
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 758,365 203,061 622,783
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 773 (1,422) (942)
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 3,839,464 4,426,014 2,498,699
Financial assets at amortised cost, category [member] | Mortgages [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Impairment loss 145,522 65,856 (25,202)
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 (10,902) 31,901 5,497
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 $ 93,069 $ 76,664 $ 78,641