Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-21-000067-index-headers.html | 2021-02-17 16:02:04 | |
| 0000860413-21-000067-index.html | 2021-02-17 16:02:04 | |
| 0000860413-21-000067.txt | 2021-02-17 16:02:04 | |
 0000860413-21-000067-xbrl.zip | 13076 | 2021-02-17 16:02:04 |
| fibk-20210217.htm | 38141 | 2021-02-17 16:02:04 |
| fibk-20210217.xsd | 2411 | 2021-02-17 16:02:04 |
| fibk-20210217_cal.xml | 702 | 2021-02-17 16:02:04 |
| fibk-20210217_def.xml | 1635 | 2021-02-17 16:02:04 |
| fibk-20210217_htm.xml | 10901 | 2021-02-17 16:02:04 |
| fibk-20210217_lab.xml | 24275 | 2021-02-17 16:02:04 |
| fibk-20210217_pre.xml | 12638 | 2021-02-17 16:02:04 |
| FilingSummary.xml | 1673 | 2021-02-17 16:02:04 |
| Financial_Report.xlsx | 5455 | 2021-02-17 16:02:04 |
| MetaLinks.json | 17159 | 2021-02-17 16:02:04 |
| R1.htm | 38621 | 2021-02-17 16:02:04 |
| report.css | 2767 | 2021-02-17 16:02:04 |
| Show.js | 1085 | 2021-02-17 16:02:04 |