Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-26-000088-index-headers.html | 2026-08-21 09:20:20 | |
| 0000860413-26-000088-index.html | 2026-08-21 09:20:20 | |
| 0000860413-26-000088.txt | 2026-08-21 09:20:20 | |
 0000860413-26-000088-xbrl.zip | 11019 | 2026-08-21 09:20:20 |
| fibk-20260821.htm | 34014 | 2026-08-21 09:20:20 |
| fibk-20260821.xsd | 1773 | 2026-08-21 09:20:20 |
| fibk-20260821_htm.xml | 2723 | 2026-08-21 09:20:20 |
| fibk-20260821_lab.xml | 21885 | 2026-08-21 09:20:20 |
| fibk-20260821_pre.xml | 12502 | 2026-08-21 09:20:20 |
| FilingSummary.xml | 1618 | 2026-08-21 09:20:20 |
| MetaLinks.json | 16849 | 2026-08-21 09:20:20 |
| R1.htm | 38076 | 2026-08-21 09:20:20 |
| report.css | 2766 | 2026-08-21 09:20:20 |
| Show.js | 1084 | 2026-08-21 09:20:20 |