Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-25-000017-index-headers.html | 2025-02-25 18:36:41 | |
| 0000860413-25-000017-index.html | 2025-02-25 18:36:41 | |
| 0000860413-25-000017.txt | 2025-02-25 18:36:41 | |
 0000860413-25-000017-xbrl.zip | 10599 | 2025-02-25 18:36:41 |
| fibk-20250224.htm | 32533 | 2025-02-25 18:36:41 |
| fibk-20250224.xsd | 1773 | 2025-02-25 18:36:41 |
| fibk-20250224_htm.xml | 2723 | 2025-02-25 18:36:41 |
| fibk-20250224_lab.xml | 21885 | 2025-02-25 18:36:41 |
| fibk-20250224_pre.xml | 12502 | 2025-02-25 18:36:41 |
| FilingSummary.xml | 1620 | 2025-02-25 18:36:41 |
| Financial_Report.xlsx | 5692 | 2025-02-25 18:36:41 |
| MetaLinks.json | 16850 | 2025-02-25 18:36:41 |
| R1.htm | 38093 | 2025-02-25 18:36:41 |
| report.css | 2766 | 2025-02-25 18:36:41 |
| Show.js | 1084 | 2025-02-25 18:36:41 |