v3.26.1
INVESTMENT SECURITIES - Investments in debt securities at amortized cost (Details) - COP ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Financial assets $ 305,457,293 $ 304,853,883
Investment securities [member]    
Disclosure of financial assets [line items]    
Financial assets 39,252,615 39,162,618
Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 39,260,893 39,181,293
Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Financial assets 243,432,271 251,981,889
Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 9,205,457 10,708,367
Debt securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 55,244,258 49,697,404
Debt securities [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 39,260,893 39,181,293
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 9,205,457 10,708,367
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Up to 1 month | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 941,587 1,120,443
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | More than 1 month and no more than 3 months | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 30,540 30,655
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | More than 3 months and no more than 1 year | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 6,269,880 7,016,333
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | More than 1 year and no more than 5 years | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets   136,318
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | More than 5 years and no more than 10 years | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets   68,447
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | More than 10 years | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 1,963,450 2,336,171
Securities issued or secured by Colombian Government | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 1,860,258 2,553,693
Securities issued or secured by other Colombian Government entities | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 5,351,209 5,563,208
Securities issued or secured by foreign Governments | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 30,540 30,655
Securities issued or secured by other financial entities | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets $ 1,963,450 2,350,549
Other debt securities | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets   64,709
Securities issued or secured by non-financial sector entities | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets   $ 145,553