v3.26.1
RISK MANAGEMENT - Liquidity risk - Undiscounted cash flows of commitment loans (Details) - Liquidity risk [member] - COP ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans $ 23,838,568 $ 22,003,376
Financial guarantee contracts [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 2,257,507 3,103,561
Standby letters of credit    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 400,887 384,272
Overdraft facility [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 2,271,247 2,261,457
Standby credit card facility    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 14,847,090 12,933,382
Undrawn approved loans    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 4,061,837 3,320,704
Not later than one month [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 9,793,764 8,523,761
Not later than one month [member] | Financial guarantee contracts [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 252,734 48,394
Not later than one month [member] | Standby letters of credit    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 7,416 26,546
Not later than one month [member] | Overdraft facility [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 2,271,247 1,861,943
Not later than one month [member] | Standby credit card facility    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 6,745,525 6,192,403
Not later than one month [member] | Undrawn approved loans    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 516,842 394,475
Later than one month and not later than six months [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 1,097,039 1,002,092
Later than one month and not later than six months [member] | Financial guarantee contracts [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 372,873 360,652
Later than one month and not later than six months [member] | Standby letters of credit    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 87,122 145,194
Later than one month and not later than six months [member] | Overdraft facility [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans   26,281
Later than one month and not later than six months [member] | Standby credit card facility    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 327,468 355,995
Later than one month and not later than six months [member] | Undrawn approved loans    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 309,576 113,970
Later than six months and not later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 5,927,557 4,564,287
Later than six months and not later than one year [member] | Financial guarantee contracts [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 1,598,026 1,064,744
Later than six months and not later than one year [member] | Standby letters of credit    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 294,149 195,627
Later than six months and not later than one year [member] | Overdraft facility [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans   32,113
Later than six months and not later than one year [member] | Standby credit card facility    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 857,444 660,752
Later than six months and not later than one year [member] | Undrawn approved loans    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 3,177,938 2,611,051
Later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 7,020,208 7,913,236
Later than one year [member] | Financial guarantee contracts [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 33,874 1,629,771
Later than one year [member] | Standby letters of credit    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 12,200 16,905
Later than one year [member] | Overdraft facility [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans   341,120
Later than one year [member] | Standby credit card facility    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 6,916,653 5,724,232
Later than one year [member] | Undrawn approved loans    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans $ 57,481 $ 201,208