Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001104659-25-058170-index-headers.html | 2025-06-10 16:30:15 | |
| 0001104659-25-058170-index.html | 2025-06-10 16:30:15 | |
| 0001104659-25-058170.txt | 2025-06-10 16:30:15 | |
 0001104659-25-058170-xbrl.zip | 43799 | 2025-06-10 16:30:15 |
| fibk-20250610.xsd | 3002 | 2025-06-10 16:30:15 |
| fibk-20250610_lab.xml | 34239 | 2025-06-10 16:30:15 |
| fibk-20250610_pre.xml | 22350 | 2025-06-10 16:30:15 |
| FilingSummary.xml | 1631 | 2025-06-10 16:30:15 |
| MetaLinks.json | 38944 | 2025-06-10 16:30:15 |
| R1.htm | 38079 | 2025-06-10 16:30:15 |
| report.css | 2766 | 2025-06-10 16:30:15 |
| Show.js | 1084 | 2025-06-10 16:30:15 |
| tm258437d8_8k.htm | 37502 | 2025-06-10 16:30:15 |
| tm258437d8_8k_htm.xml | 3572 | 2025-06-10 16:30:15 |
| tm258437d8_ex4-2.htm | 217983 | 2025-06-10 16:30:15 |