Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-25-000168-index-headers.html | 2025-11-18 09:15:21 | |
| 0000860413-25-000168-index.html | 2025-11-18 09:15:21 | |
| 0000860413-25-000168.txt | 2025-11-18 09:15:21 | |
 0000860413-25-000168-xbrl.zip | 43700 | 2025-11-18 09:15:21 |
| fibk-20251114.htm | 42190 | 2025-11-18 09:15:21 |
| fibk-20251114.xsd | 1773 | 2025-11-18 09:15:21 |
| fibk-20251114_htm.xml | 2723 | 2025-11-18 09:15:21 |
| fibk-20251114_lab.xml | 21885 | 2025-11-18 09:15:21 |
| fibk-20251114_pre.xml | 12502 | 2025-11-18 09:15:21 |
| fibk-20251118xex101xtransi.htm | 84175 | 2025-11-18 09:15:21 |
| fibk-20251118xex102xsheple.htm | 116756 | 2025-11-18 09:15:21 |
| FilingSummary.xml | 1618 | 2025-11-18 09:15:21 |
| MetaLinks.json | 16849 | 2025-11-18 09:15:21 |
| R1.htm | 38076 | 2025-11-18 09:15:21 |
| report.css | 2767 | 2025-11-18 09:15:21 |
| Show.js | 1084 | 2025-11-18 09:15:21 |