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RISK MANAGEMENT - Liquidity Risk - Undiscounted cash flows of commitment loans (Details) - Liquidity risk [member] - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans $ 24,849,251 $ 23,108,555
Financial guarantee contracts [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 2,422,146 3,552,304
Standby letters of credit    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 736,473 948,455
Overdraft facility [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 2,264,226 2,491,299
Standby credit card facility    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 12,449,298 11,861,422
Undrawn approved loans    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 4,220,322 3,231,548
Other Commitments    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 2,756,786 1,023,527
Not later than one month [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 23,290,847 20,988,794
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 1,813,970 2,129,962
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 606,747 947,723
Not later than one month [member] | Overdraft facility [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 2,264,226 2,491,299
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 11,917,268 11,263,240
Not later than one month [member] | Undrawn approved loans    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 4,002,210 3,133,043
Not later than one month [member] | Other Commitments    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 2,686,426 1,023,527
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 570,291 368,139
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 80,012 142,987
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 89,801 714
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 112,006 125,933
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 218,112 98,505
Later than one month and not later than six months [member] | Other Commitments    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 70,360  
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 115,250 155,590
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 30,320 61,140
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 925  
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 84,005 94,450
Later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 872,863 1,596,032
Later than one year [member] | Financial guarantee contracts [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 497,844 1,218,215
Later than one year [member] | Standby letters of credit    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans 39,000 18
Later than one year [member] | Standby credit card facility    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Commitments loans $ 336,019 $ 377,799