Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-21-000162-index-headers.html | 2021-05-27 15:52:42 | |
| 0000860413-21-000162-index.html | 2021-05-27 15:52:42 | |
| 0000860413-21-000162.txt | 2021-05-27 15:52:42 | |
 0000860413-21-000162-xbrl.zip | 11586 | 2021-05-27 15:52:42 |
| fibk-20210526.htm | 58178 | 2021-05-27 15:52:42 |
| fibk-20210526.xsd | 1890 | 2021-05-27 15:52:42 |
| fibk-20210526_htm.xml | 10895 | 2021-05-27 15:52:42 |
| fibk-20210526_lab.xml | 24137 | 2021-05-27 15:52:42 |
| fibk-20210526_pre.xml | 12500 | 2021-05-27 15:52:42 |
| FilingSummary.xml | 1590 | 2021-05-27 15:52:42 |
| Financial_Report.xlsx | 5677 | 2021-05-27 15:52:42 |
| MetaLinks.json | 16583 | 2021-05-27 15:52:42 |
| R1.htm | 38580 | 2021-05-27 15:52:42 |
| report.css | 2766 | 2021-05-27 15:52:42 |
| Show.js | 1084 | 2021-05-27 15:52:42 |