Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-24-000003-index-headers.html | 2024-01-30 16:21:13 | |
| 0000860413-24-000003-index.html | 2024-01-30 16:21:13 | |
| 0000860413-24-000003.txt | 2024-01-30 16:21:13 | |
 0000860413-24-000003-xbrl.zip | 61784 | 2024-01-30 16:21:13 |
| dec2023ip.htm | 33017 | 2024-01-30 16:21:13 |
 dec2023ip001.jpg | 292663 | 2024-01-30 16:21:13 |
 dec2023ip002.jpg | 284746 | 2024-01-30 16:21:13 |
 dec2023ip003.jpg | 99262 | 2024-01-30 16:21:13 |
 dec2023ip004.jpg | 81378 | 2024-01-30 16:21:13 |
 dec2023ip005.jpg | 163966 | 2024-01-30 16:21:13 |
 dec2023ip006.jpg | 84216 | 2024-01-30 16:21:13 |
 dec2023ip007.jpg | 97678 | 2024-01-30 16:21:13 |
 dec2023ip008.jpg | 108733 | 2024-01-30 16:21:13 |
 dec2023ip009.jpg | 79590 | 2024-01-30 16:21:13 |
 dec2023ip010.jpg | 107097 | 2024-01-30 16:21:13 |
 dec2023ip011.jpg | 100891 | 2024-01-30 16:21:13 |
 dec2023ip012.jpg | 61633 | 2024-01-30 16:21:13 |
 dec2023ip013.jpg | 73324 | 2024-01-30 16:21:13 |
 dec2023ip014.jpg | 98096 | 2024-01-30 16:21:13 |
 dec2023ip015.jpg | 97055 | 2024-01-30 16:21:13 |
 dec2023ip016.jpg | 268625 | 2024-01-30 16:21:13 |
 dec2023ip017.jpg | 114763 | 2024-01-30 16:21:13 |
 dec2023ip018.jpg | 101183 | 2024-01-30 16:21:13 |
 dec2023ip019.jpg | 108947 | 2024-01-30 16:21:13 |
| fibk-20231231x8kpr.htm | 981431 | 2024-01-30 16:21:13 |
| fibk-20240130.htm | 32721 | 2024-01-30 16:21:13 |
| fibk-20240130.xsd | 1892 | 2024-01-30 16:21:13 |
| fibk-20240130_htm.xml | 2723 | 2024-01-30 16:21:13 |
| fibk-20240130_lab.xml | 24139 | 2024-01-30 16:21:13 |
| fibk-20240130_pre.xml | 12502 | 2024-01-30 16:21:13 |
 fibslogo2linea04a.jpg | 165531 | 2024-01-30 16:21:13 |
| FilingSummary.xml | 1620 | 2024-01-30 16:21:13 |
| Financial_Report.xlsx | 5691 | 2024-01-30 16:21:13 |
| MetaLinks.json | 16850 | 2024-01-30 16:21:13 |
| R1.htm | 38095 | 2024-01-30 16:21:13 |
| report.css | 2767 | 2024-01-30 16:21:13 |
| Show.js | 1085 | 2024-01-30 16:21:13 |