Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001104659-25-057359-index-headers.html | 2025-06-06 16:27:30 | |
| 0001104659-25-057359-index.html | 2025-06-06 16:27:30 | |
| 0001104659-25-057359.txt | 2025-06-06 16:27:30 | |
 0001104659-25-057359-xbrl.zip | 67594 | 2025-06-06 16:27:30 |
| fibk-20250605.xsd | 3002 | 2025-06-06 16:27:30 |
| fibk-20250605_lab.xml | 34239 | 2025-06-06 16:27:30 |
| fibk-20250605_pre.xml | 22350 | 2025-06-06 16:27:30 |
| FilingSummary.xml | 1631 | 2025-06-06 16:27:30 |
| MetaLinks.json | 38944 | 2025-06-06 16:27:30 |
| R1.htm | 38081 | 2025-06-06 16:27:30 |
| report.css | 2767 | 2025-06-06 16:27:30 |
| Show.js | 1085 | 2025-06-06 16:27:30 |
| tm258437d7_8k.htm | 35214 | 2025-06-06 16:27:30 |
| tm258437d7_8k_htm.xml | 3572 | 2025-06-06 16:27:30 |
| tm258437d7_ex1-1.htm | 265557 | 2025-06-06 16:27:30 |
 tm258437d7_ex1-1img001.jpg | 17423 | 2025-06-06 16:27:30 |
| tm258437d7_ex5-1.htm | 13046 | 2025-06-06 16:27:30 |
 tm258437d7_ex5-1img001.jpg | 5511 | 2025-06-06 16:27:30 |
 tm258437d7_ex5-1img002.jpg | 4539 | 2025-06-06 16:27:30 |
| tm258437d7_ex99-1.htm | 10883 | 2025-06-06 16:27:30 |
 tm258437d7_ex99-1img001.jpg | 17581 | 2025-06-06 16:27:30 |