Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-25-000051-index-headers.html | 2025-04-28 16:05:17 | |
| 0000860413-25-000051-index.html | 2025-04-28 16:05:17 | |
| 0000860413-25-000051.txt | 2025-04-28 16:05:17 | |
 0000860413-25-000051-xbrl.zip | 17173 | 2025-04-28 16:05:17 |
| fibk-20250428.htm | 37875 | 2025-04-28 16:05:17 |
| fibk-20250428.xsd | 1773 | 2025-04-28 16:05:17 |
| fibk-20250428x8kprxaz_ks.htm | 28976 | 2025-04-28 16:05:17 |
| fibk-20250428_htm.xml | 2723 | 2025-04-28 16:05:17 |
| fibk-20250428_lab.xml | 21885 | 2025-04-28 16:05:17 |
| fibk-20250428_pre.xml | 12502 | 2025-04-28 16:05:17 |
| FilingSummary.xml | 1618 | 2025-04-28 16:05:17 |
| Financial_Report.xlsx | 5713 | 2025-04-28 16:05:17 |
 image_0a.jpg | 37290 | 2025-04-28 16:05:17 |
 image_1a.jpg | 25135 | 2025-04-28 16:05:17 |
| MetaLinks.json | 16850 | 2025-04-28 16:05:17 |
| R1.htm | 38077 | 2025-04-28 16:05:17 |
| report.css | 2767 | 2025-04-28 16:05:17 |
| Show.js | 1085 | 2025-04-28 16:05:17 |