Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-22-000103-index-headers.html | 2022-03-21 16:26:02 | |
| 0000860413-22-000103-index.html | 2022-03-21 16:26:02 | |
| 0000860413-22-000103.txt | 2022-03-21 16:26:02 | |
 0000860413-22-000103-xbrl.zip | 30361 | 2022-03-21 16:26:02 |
| fibk-20220315.htm | 43295 | 2022-03-21 16:26:02 |
| fibk-20220315.xsd | 1902 | 2022-03-21 16:26:02 |
| fibk-20220315xex991rsa.htm | 58115 | 2022-03-21 16:26:02 |
| fibk-20220315xex992psa.htm | 66230 | 2022-03-21 16:26:02 |
| fibk-20220315_htm.xml | 10971 | 2022-03-21 16:26:02 |
| fibk-20220315_lab.xml | 24275 | 2022-03-21 16:26:02 |
| fibk-20220315_pre.xml | 12638 | 2022-03-21 16:26:02 |
| FilingSummary.xml | 1695 | 2022-03-21 16:26:02 |
| Financial_Report.xlsx | 5676 | 2022-03-21 16:26:02 |
| MetaLinks.json | 16736 | 2022-03-21 16:26:02 |
| R1.htm | 38753 | 2022-03-21 16:26:02 |
| report.css | 2767 | 2022-03-21 16:26:02 |
| Show.js | 1085 | 2022-03-21 16:26:02 |