Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-24-000071-index-headers.html | 2024-05-23 16:34:10 | |
| 0000860413-24-000071-index.html | 2024-05-23 16:34:10 | |
| 0000860413-24-000071.txt | 2024-05-23 16:34:10 | |
 0000860413-24-000071-xbrl.zip | 10705 | 2024-05-23 16:34:10 |
| fibk-20240520.htm | 46137 | 2024-05-23 16:34:10 |
| fibk-20240520.xsd | 1892 | 2024-05-23 16:34:10 |
| fibk-20240520_htm.xml | 2723 | 2024-05-23 16:34:10 |
| fibk-20240520_lab.xml | 22788 | 2024-05-23 16:34:10 |
| fibk-20240520_pre.xml | 13037 | 2024-05-23 16:34:10 |
| FilingSummary.xml | 1889 | 2024-05-23 16:34:10 |
| Financial_Report.xlsx | 5691 | 2024-05-23 16:34:10 |
| MetaLinks.json | 17374 | 2024-05-23 16:34:10 |
| R1.htm | 38095 | 2024-05-23 16:34:10 |
| report.css | 2766 | 2024-05-23 16:34:10 |
| Show.js | 1084 | 2024-05-23 16:34:10 |