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CUSTOMER DEPOSITS - Effective interest rates (Details)
Dec. 31, 2023
Dec. 31, 2022
Colombia, Pesos | Bottom of range [member] | Interest-bearing checking accounts [member]    
Disclosure of customer deposits [line items]    
Borrowings, interest rate 0.11% 0.01%
Colombia, Pesos | Bottom of range [member] | Savings accounts [member]    
Disclosure of customer deposits [line items]    
Borrowings, interest rate 0.01% 0.01%
Colombia, Pesos | Bottom of range [member] | Fixed term deposit certificates [member]    
Disclosure of customer deposits [line items]    
Borrowings, interest rate 0.05% 0.05%
Colombia, Pesos | Top of range [member] | Interest-bearing checking accounts [member]    
Disclosure of customer deposits [line items]    
Borrowings, interest rate 13.40% 13.20%
Colombia, Pesos | Top of range [member] | Savings accounts [member]    
Disclosure of customer deposits [line items]    
Borrowings, interest rate 16.13% 17.20%
Colombia, Pesos | Top of range [member] | Fixed term deposit certificates [member]    
Disclosure of customer deposits [line items]    
Borrowings, interest rate 23.52% 19.54%
Foreign currency [member] | Bottom of range [member] | Interest-bearing checking accounts [member]    
Disclosure of customer deposits [line items]    
Borrowings, interest rate 0.25% 0.02%
Foreign currency [member] | Bottom of range [member] | Savings accounts [member]    
Disclosure of customer deposits [line items]    
Borrowings, interest rate 0.25% 0.01%
Foreign currency [member] | Bottom of range [member] | Fixed term deposit certificates [member]    
Disclosure of customer deposits [line items]    
Borrowings, interest rate 0.45% 0.15%
Foreign currency [member] | Top of range [member] | Interest-bearing checking accounts [member]    
Disclosure of customer deposits [line items]    
Borrowings, interest rate 5.30% 4.40%
Foreign currency [member] | Top of range [member] | Savings accounts [member]    
Disclosure of customer deposits [line items]    
Borrowings, interest rate 5.30% 4.00%
Foreign currency [member] | Top of range [member] | Fixed term deposit certificates [member]    
Disclosure of customer deposits [line items]    
Borrowings, interest rate 8.46% 8.05%