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CUSTOMER DEPOSITS - Effective interest rates (Details)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Colombia, Pesos | Bottom of range [member]    
Disclosure of customer deposits [line items]    
Customer deposits, effective interest rate, interest-bearing checking accounts (as a percent) 0.17% 0.11%
Customer deposits, effective interest rate, savings accounts (as a percent) 0.01% 0.01%
Customer deposits, effective interest rate, fixed term deposit certificates (as a percent) 0.05% 0.05%
Colombia, Pesos | Top of range [member]    
Disclosure of customer deposits [line items]    
Customer deposits, effective interest rate, interest-bearing checking accounts (as a percent) 9.35% 13.40%
Customer deposits, effective interest rate, savings accounts (as a percent) 13.78% 16.13%
Customer deposits, effective interest rate, fixed term deposit certificates (as a percent) 23.52% 23.52%
Foreign currency | Bottom of range [member]    
Disclosure of customer deposits [line items]    
Customer deposits, effective interest rate, interest-bearing checking accounts (as a percent) 0.03% 0.25%
Customer deposits, effective interest rate, savings accounts (as a percent) 0.05% 0.25%
Customer deposits, effective interest rate, fixed term deposit certificates (as a percent) 0.30% 0.45%
Foreign currency | Top of range [member]    
Disclosure of customer deposits [line items]    
Customer deposits, effective interest rate, interest-bearing checking accounts (as a percent) 5.60% 5.30%
Customer deposits, effective interest rate, savings accounts (as a percent) 5.00% 5.30%
Customer deposits, effective interest rate, fixed term deposit certificates (as a percent) 9.00% 8.46%