Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-20-000214-index-headers.html | 2020-09-14 16:00:04 | |
| 0000860413-20-000214-index.html | 2020-09-14 16:00:04 | |
| 0000860413-20-000214.txt | 2020-09-14 16:00:04 | |
 0000860413-20-000214-xbrl.zip | 12891 | 2020-09-14 16:00:04 |
| fibk-20200912.htm | 51880 | 2020-09-14 16:00:04 |
| fibk-20200912.xsd | 2411 | 2020-09-14 16:00:04 |
| fibk-20200912_cal.xml | 702 | 2020-09-14 16:00:04 |
| fibk-20200912_def.xml | 1635 | 2020-09-14 16:00:04 |
| fibk-20200912_htm.xml | 10882 | 2020-09-14 16:00:04 |
| fibk-20200912_lab.xml | 24275 | 2020-09-14 16:00:04 |
| fibk-20200912_pre.xml | 12638 | 2020-09-14 16:00:04 |
| FilingSummary.xml | 1673 | 2020-09-14 16:00:04 |
| Financial_Report.xlsx | 5455 | 2020-09-14 16:00:04 |
| MetaLinks.json | 17159 | 2020-09-14 16:00:04 |
| R1.htm | 38621 | 2020-09-14 16:00:04 |
| report.css | 2767 | 2020-09-14 16:00:04 |
| Show.js | 1085 | 2020-09-14 16:00:04 |