Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-25-000003-index-headers.html | 2025-01-10 08:53:11 | |
| 0000860413-25-000003-index.html | 2025-01-10 08:53:11 | |
| 0000860413-25-000003.txt | 2025-01-10 08:53:11 | |
 0000860413-25-000003-xbrl.zip | 11469 | 2025-01-10 08:53:11 |
| fibk-20250103.htm | 35607 | 2025-01-10 08:53:11 |
| fibk-20250103.xsd | 1773 | 2025-01-10 08:53:11 |
| fibk-20250103_htm.xml | 2723 | 2025-01-10 08:53:11 |
| fibk-20250103_lab.xml | 21885 | 2025-01-10 08:53:11 |
| fibk-20250103_pre.xml | 12502 | 2025-01-10 08:53:11 |
| FilingSummary.xml | 1618 | 2025-01-10 08:53:11 |
| Financial_Report.xlsx | 5694 | 2025-01-10 08:53:11 |
| MetaLinks.json | 16850 | 2025-01-10 08:53:11 |
| R1.htm | 38092 | 2025-01-10 08:53:11 |
| report.css | 2766 | 2025-01-10 08:53:11 |
| Show.js | 1084 | 2025-01-10 08:53:11 |