| Deposits | December 31, 2017 | December 31, 2016 |
| In millions of COP | ||
| Saving accounts | 54,255,583 | 48,693,702 |
| Time deposits | 53,961,586 | 52,673,385 |
| Checking accounts | 22,065,647 | 21,443,002 |
| Other deposits | 1,676,399 | 1,813,922 |
| Total | 131,959,215 | 124,624,011 |
| CDT | Effective interest rate | December 31, 2017 | ||
| Modality | Minimum | Maximum | Carrying value | Fair value |
| In millions of COP | ||||
| Less than 6 Months | 0.10% | 6.96% | 7,536,280 | 7,535,719 |
| Equal to 6 months and less than 12 months | 0.20% | 8.03% | 5,711,157 | 5,718,827 |
| Equal to 12 months and less than 18 months | 0.20% | 9.03% | 8,062,290 | 8,146,366 |
| Equal to or greater than 18 months | 0.01% | 18.29% | 32,651,859 | 33,381,189 |
| Total | 53,961,586 | 54,782,101 | ||
| CDT | Effective interest rate | December 31, 2016 | ||
| Modality | Minimum | Maximum | Carrying value | Fair value |
| In millions of COP | ||||
| Less than 6 Months | 0.01% | 8.86% | 10,495,536 | 10,458,936 |
| Equal to 6 months and less than 12 months | 0.20% | 9.63% | 7,612,216 | 7,629,195 |
| Equal to 12 months and less than 18 months | 0.01% | 10.01% | 5,345,522 | 5,391,407 |
| Equal to or greater than 18 months | 0.01% | 18.29% | 29,220,111 | 29,666,246 |
| Total | 52,673,385 | 53,145,784 | ||
| December 31, 2017 | ||
| Period | Carrying value | Fair value |
| In millions of COP | ||
| Less than one year | 36,416,439 | 36,701,555 |
| 1 to 3 years | 10,525,956 | 10,727,828 |
| 3 to 5 years | 5,367,765 | 5,592,750 |
| More than 5 years | 1,651,426 | 1,759,968 |
| Total | 53,961,586 | 54,782,101 |
| December 31, 2016 | ||
| Period | Carrying value | Fair value |
| In millions of COP | ||
| Less than one year | 34,442,445 | 34,626,003 |
| 1 to 3 years | 10,698,266 | 10,815,760 |
| 3 to 5 years | 5,401,074 | 5,505,403 |
| More than 5 years | 2,131,600 | 2,198,618 |
| Total | 52,673,385 | 53,145,784 |