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RISK MANAGEMENT - Mitigation of credit risk, collateral and other (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]    
Credit exposure $ 269,560,244 $ 263,369,003
Loan portfolio [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Credit exposure 186,203,770 188,313,361
Mortgage [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Credit exposure 18,486,206 17,883,355
Less than 50% | Mortgage [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Credit exposure 7,784,742 6,828,495
51 - 70% | Mortgage [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Credit exposure 6,379,677 6,139,066
71 - 90% | Mortgage [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Credit exposure 3,281,508 3,595,794
91 - 100% | Mortgage [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Credit exposure 771,664 1,019,031
More than 100% | Mortgage [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Credit exposure 268,615 300,969
Financial instruments credit-impaired [member] | Mortgage [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Credit exposure 604,424 497,132
Financial instruments credit-impaired [member] | Less than 50% | Mortgage [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Credit exposure 146,489 141,621
Financial instruments credit-impaired [member] | 51 - 70% | Mortgage [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Credit exposure 252,655 184,151
Financial instruments credit-impaired [member] | More than 70% | Mortgage [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Credit exposure $ 205,280 $ 171,360