Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-26-000048-index-headers.html | 2026-05-29 16:26:09 | |
| 0000860413-26-000048-index.html | 2026-05-29 16:26:09 | |
| 0000860413-26-000048.txt | 2026-05-29 16:26:09 | |
 0000860413-26-000048-xbrl.zip | 12928 | 2026-05-29 16:26:09 |
| fibk-20260527.htm | 51622 | 2026-05-29 16:26:09 |
| fibk-20260527.xsd | 1773 | 2026-05-29 16:26:09 |
| fibk-20260527_htm.xml | 3099 | 2026-05-29 16:26:09 |
| fibk-20260527_lab.xml | 22788 | 2026-05-29 16:26:09 |
| fibk-20260527_pre.xml | 13037 | 2026-05-29 16:26:09 |
| fibk-20260529xex31_certxof.htm | 9039 | 2026-05-29 16:26:09 |
| FilingSummary.xml | 1618 | 2026-05-29 16:26:09 |
| MetaLinks.json | 17373 | 2026-05-29 16:26:09 |
| R1.htm | 40668 | 2026-05-29 16:26:09 |
| report.css | 2766 | 2026-05-29 16:26:09 |
| Show.js | 1084 | 2026-05-29 16:26:09 |