Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-25-000155-index-headers.html | 2025-10-16 16:01:36 | |
| 0000860413-25-000155-index.html | 2025-10-16 16:01:36 | |
| 0000860413-25-000155.txt | 2025-10-16 16:01:36 | |
 0000860413-25-000155-xbrl.zip | 17252 | 2025-10-16 16:01:36 |
| fibk-20251016.htm | 38002 | 2025-10-16 16:01:36 |
| fibk-20251016.xsd | 1773 | 2025-10-16 16:01:36 |
| fibk-20251016x8kprxnebraska.htm | 27473 | 2025-10-16 16:01:36 |
| fibk-20251016_htm.xml | 2723 | 2025-10-16 16:01:36 |
| fibk-20251016_lab.xml | 21885 | 2025-10-16 16:01:36 |
| fibk-20251016_pre.xml | 12502 | 2025-10-16 16:01:36 |
| FilingSummary.xml | 1618 | 2025-10-16 16:01:36 |
 image.jpg | 17609 | 2025-10-16 16:01:36 |
 image_1.jpg | 25135 | 2025-10-16 16:01:36 |
| MetaLinks.json | 16849 | 2025-10-16 16:01:36 |
| R1.htm | 38076 | 2025-10-16 16:01:36 |
| report.css | 2767 | 2025-10-16 16:01:36 |
| Show.js | 1085 | 2025-10-16 16:01:36 |