Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-22-000113-index-headers.html | 2022-03-25 07:12:20 | |
| 0000860413-22-000113-index.html | 2022-03-25 07:12:20 | |
| 0000860413-22-000113.txt | 2022-03-25 07:12:20 | |
 0000860413-22-000113-xbrl.zip | 14349 | 2022-03-25 07:12:20 |
| fibk-20220325.htm | 43704 | 2022-03-25 07:12:20 |
| fibk-20220325.xsd | 1902 | 2022-03-25 07:12:20 |
| fibk-20220325x8kpr.htm | 9669 | 2022-03-25 07:12:20 |
| fibk-20220325_htm.xml | 10971 | 2022-03-25 07:12:20 |
| fibk-20220325_lab.xml | 24275 | 2022-03-25 07:12:20 |
| fibk-20220325_pre.xml | 12638 | 2022-03-25 07:12:20 |
 fibslogo2linea04.jpg | 165531 | 2022-03-25 07:12:20 |
| FilingSummary.xml | 1647 | 2022-03-25 07:12:20 |
| Financial_Report.xlsx | 5675 | 2022-03-25 07:12:20 |
| MetaLinks.json | 16736 | 2022-03-25 07:12:20 |
| R1.htm | 38753 | 2022-03-25 07:12:20 |
| report.css | 2767 | 2022-03-25 07:12:20 |
| Show.js | 1085 | 2022-03-25 07:12:20 |