Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-21-000192-index-headers.html | 2021-07-15 13:50:39 | |
| 0000860413-21-000192-index.html | 2021-07-15 13:50:39 | |
| 0000860413-21-000192.txt | 2021-07-15 13:50:39 | |
 0000860413-21-000192-xbrl.zip | 10788 | 2021-07-15 13:50:39 |
| fibk-20210714.htm | 37281 | 2021-07-15 13:50:39 |
| fibk-20210714.xsd | 1890 | 2021-07-15 13:50:39 |
| fibk-20210714_htm.xml | 11012 | 2021-07-15 13:50:39 |
| fibk-20210714_lab.xml | 23832 | 2021-07-15 13:50:39 |
| fibk-20210714_pre.xml | 12500 | 2021-07-15 13:50:39 |
| FilingSummary.xml | 1590 | 2021-07-15 13:50:39 |
| Financial_Report.xlsx | 5674 | 2021-07-15 13:50:39 |
| MetaLinks.json | 16541 | 2021-07-15 13:50:39 |
| R1.htm | 38583 | 2021-07-15 13:50:39 |
| report.css | 2766 | 2021-07-15 13:50:39 |
| Show.js | 1084 | 2021-07-15 13:50:39 |