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INVESTMENT SECURITIES - Investments in debt securities at fair value through OCI (Details) - Financial assets measured at fair value through other comprehensive income, category [member] - Investment securities at fair value [member] - COP ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Cost | $ 28,358,760 | $ 24,517,308
Unrealized Gain | 66,045 | 178,985
Unrealized Losses | (1,374,607) | (1,369,517)
Fair Value | 27,050,198 | 23,326,776
ECL | 18,310 | 12,972
Securities issued or secured by Colombian Government |  |
Disclosure of financial assets [line items] |  |
Cost | 19,278,224 | 17,626,642
Unrealized Gain | 36,588 | 146,608
Unrealized Losses | (1,046,904) | (982,457)
Fair Value | 18,267,908 | 16,790,793
ECL | 11,761 | 7,204
Securities issued or secured by other Colombian Government entities |  |
Disclosure of financial assets [line items] |  |
Cost | 484,874 | 898,373
Unrealized Gain | 336 | 6,213
Unrealized Losses | (22,465) | (40,798)
Fair Value | 462,745 | 863,788
ECL | 803 | 1,183
Securities issued or secured by foreign Governments |  |
Disclosure of financial assets [line items] |  |
Cost | 4,682,807 | 2,717,651
Unrealized Gain | 18,439 | 6,385
Unrealized Losses | (198,436) | (216,998)
Fair Value | 4,502,810 | 2,507,038
ECL | 1,135 | 611
Securities issued or secured by central banks |  |
Disclosure of financial assets [line items] |  |
Cost | 251,079 | 194,480
Unrealized Gain | 32 |
Unrealized Losses | (46,256) | (48,991)
Fair Value | 204,855 | 145,489
ECL | 97 | 56
Securities issued or secured by other financial entities |  |
Disclosure of financial assets [line items] |  |
Cost | 2,640,204 | 2,159,892
Unrealized Gain | 9,270 | 19,370
Unrealized Losses | (22,691) | (36,615)
Fair Value | 2,626,783 | 2,142,647
ECL | 2,740 | 2,398
Securities issued or secured by non-financial sector entities |  |
Disclosure of financial assets [line items] |  |
Cost | 249,748 | 215,877
Unrealized Gain | 665 | 156
Unrealized Losses | (753) | (1,462)
Fair Value | 249,660 | 214,571
ECL | 859 | 822
Other debt securities |  |
Disclosure of financial assets [line items] |  |
Cost | 771,824 | 704,393
Unrealized Gain | 715 | 253
Unrealized Losses | (37,102) | (42,196)
Fair Value | 735,437 | 662,450
ECL | $ 915 | $ 698

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