Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-24-000128-index-headers.html | 2024-10-24 16:17:36 | |
| 0000860413-24-000128-index.html | 2024-10-24 16:17:36 | |
| 0000860413-24-000128.txt | 2024-10-24 16:17:36 | |
 0000860413-24-000128-xbrl.zip | 54840 | 2024-10-24 16:17:36 |
| fibk-20240930x8kpr.htm | 785839 | 2024-10-24 16:17:36 |
| fibk-20241024.htm | 32927 | 2024-10-24 16:17:36 |
| fibk-20241024.xsd | 1773 | 2024-10-24 16:17:36 |
| fibk-20241024_htm.xml | 2723 | 2024-10-24 16:17:36 |
| fibk-20241024_lab.xml | 21885 | 2024-10-24 16:17:36 |
| fibk-20241024_pre.xml | 12502 | 2024-10-24 16:17:36 |
 fibslogo2linea04a.jpg | 165531 | 2024-10-24 16:17:36 |
| FilingSummary.xml | 1618 | 2024-10-24 16:17:36 |
| Financial_Report.xlsx | 5692 | 2024-10-24 16:17:36 |
| MetaLinks.json | 16850 | 2024-10-24 16:17:36 |
| R1.htm | 38092 | 2024-10-24 16:17:36 |
| report.css | 2767 | 2024-10-24 16:17:36 |
| sep2024ip.htm | 34482 | 2024-10-24 16:17:36 |
 sep2024ip001.jpg | 139047 | 2024-10-24 16:17:36 |
 sep2024ip002.jpg | 272153 | 2024-10-24 16:17:36 |
 sep2024ip003.jpg | 97886 | 2024-10-24 16:17:36 |
 sep2024ip004.jpg | 193038 | 2024-10-24 16:17:36 |
 sep2024ip005.jpg | 96626 | 2024-10-24 16:17:36 |
 sep2024ip006.jpg | 84412 | 2024-10-24 16:17:36 |
 sep2024ip007.jpg | 68761 | 2024-10-24 16:17:36 |
 sep2024ip008.jpg | 94301 | 2024-10-24 16:17:36 |
 sep2024ip009.jpg | 105798 | 2024-10-24 16:17:36 |
 sep2024ip010.jpg | 84156 | 2024-10-24 16:17:36 |
 sep2024ip011.jpg | 105276 | 2024-10-24 16:17:36 |
 sep2024ip012.jpg | 94977 | 2024-10-24 16:17:36 |
 sep2024ip013.jpg | 59737 | 2024-10-24 16:17:36 |
 sep2024ip014.jpg | 75528 | 2024-10-24 16:17:36 |
 sep2024ip015.jpg | 79224 | 2024-10-24 16:17:36 |
 sep2024ip016.jpg | 110065 | 2024-10-24 16:17:36 |
 sep2024ip017.jpg | 279253 | 2024-10-24 16:17:36 |
 sep2024ip018.jpg | 112639 | 2024-10-24 16:17:36 |
 sep2024ip019.jpg | 105698 | 2024-10-24 16:17:36 |
| Show.js | 1085 | 2024-10-24 16:17:36 |