Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-22-000067-index-headers.html | 2022-02-25 17:18:29 | |
| 0000860413-22-000067-index.html | 2022-02-25 17:18:29 | |
| 0000860413-22-000067.txt | 2022-02-25 17:18:29 | |
 0000860413-22-000067-xbrl.zip | 12256 | 2022-02-25 17:18:29 |
| fibk-20220225.htm | 43257 | 2022-02-25 17:18:29 |
| fibk-20220225.xsd | 1902 | 2022-02-25 17:18:29 |
| fibk-20220225_htm.xml | 10983 | 2022-02-25 17:18:29 |
| fibk-20220225_lab.xml | 24275 | 2022-02-25 17:18:29 |
| fibk-20220225_pre.xml | 12638 | 2022-02-25 17:18:29 |
| FilingSummary.xml | 1610 | 2022-02-25 17:18:29 |
| Financial_Report.xlsx | 5675 | 2022-02-25 17:18:29 |
| MetaLinks.json | 16737 | 2022-02-25 17:18:29 |
| R1.htm | 38623 | 2022-02-25 17:18:29 |
| report.css | 2766 | 2022-02-25 17:18:29 |
| Show.js | 1084 | 2022-02-25 17:18:29 |