Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-22-000115-index-headers.html | 2022-03-25 16:44:48 | |
| 0000860413-22-000115-index.html | 2022-03-25 16:44:48 | |
| 0000860413-22-000115.txt | 2022-03-25 16:44:48 | |
 0000860413-22-000115-xbrl.zip | 11064 | 2022-03-25 16:44:48 |
| fibk-20220325.htm | 38138 | 2022-03-25 16:44:48 |
| fibk-20220325.xsd | 1902 | 2022-03-25 16:44:48 |
| fibk-20220325_htm.xml | 10971 | 2022-03-25 16:44:48 |
| fibk-20220325_lab.xml | 24275 | 2022-03-25 16:44:48 |
| fibk-20220325_pre.xml | 12638 | 2022-03-25 16:44:48 |
| FilingSummary.xml | 1607 | 2022-03-25 16:44:48 |
| Financial_Report.xlsx | 5677 | 2022-03-25 16:44:48 |
| MetaLinks.json | 16736 | 2022-03-25 16:44:48 |
| R1.htm | 38753 | 2022-03-25 16:44:48 |
| report.css | 2766 | 2022-03-25 16:44:48 |
| Show.js | 1084 | 2022-03-25 16:44:48 |