Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-24-000108-index-headers.html | 2024-07-12 16:03:29 | |
| 0000860413-24-000108-index.html | 2024-07-12 16:03:29 | |
| 0000860413-24-000108.txt | 2024-07-12 16:03:29 | |
 0000860413-24-000108-xbrl.zip | 11119 | 2024-07-12 16:03:29 |
| fibk-20240708.htm | 34504 | 2024-07-12 16:03:29 |
| fibk-20240708.xsd | 1892 | 2024-07-12 16:03:29 |
| fibk-20240708_htm.xml | 2723 | 2024-07-12 16:03:29 |
| fibk-20240708_lab.xml | 21885 | 2024-07-12 16:03:29 |
| fibk-20240708_pre.xml | 12502 | 2024-07-12 16:03:29 |
| FilingSummary.xml | 1618 | 2024-07-12 16:03:29 |
| Financial_Report.xlsx | 5695 | 2024-07-12 16:03:29 |
| MetaLinks.json | 16850 | 2024-07-12 16:03:29 |
| R1.htm | 38093 | 2024-07-12 16:03:29 |
| report.css | 2766 | 2024-07-12 16:03:29 |
| Show.js | 1084 | 2024-07-12 16:03:29 |