Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-21-000202-index-headers.html | 2021-08-23 07:46:33 | |
| 0000860413-21-000202-index.html | 2021-08-23 07:46:33 | |
| 0000860413-21-000202.txt | 2021-08-23 07:46:33 | |
 0000860413-21-000202-xbrl.zip | 12719 | 2021-08-23 07:46:33 |
| fibk-20210819.htm | 49845 | 2021-08-23 07:46:33 |
| fibk-20210819.xsd | 1890 | 2021-08-23 07:46:33 |
| fibk-20210819_htm.xml | 10897 | 2021-08-23 07:46:33 |
| fibk-20210819_lab.xml | 24137 | 2021-08-23 07:46:33 |
| fibk-20210819_pre.xml | 12500 | 2021-08-23 07:46:33 |
| FilingSummary.xml | 1592 | 2021-08-23 07:46:33 |
| Financial_Report.xlsx | 5677 | 2021-08-23 07:46:33 |
| MetaLinks.json | 16583 | 2021-08-23 07:46:33 |
| R1.htm | 38583 | 2021-08-23 07:46:33 |
| report.css | 2766 | 2021-08-23 07:46:33 |
| Show.js | 1084 | 2021-08-23 07:46:33 |