Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-23-000008-index-headers.html | 2023-01-13 16:06:52 | |
| 0000860413-23-000008-index.html | 2023-01-13 16:06:52 | |
| 0000860413-23-000008.txt | 2023-01-13 16:06:52 | |
 0000860413-23-000008-xbrl.zip | 10995 | 2023-01-13 16:06:52 |
| fibk-20230111.htm | 37863 | 2023-01-13 16:06:52 |
| fibk-20230111.xsd | 1890 | 2023-01-13 16:06:52 |
| fibk-20230111_htm.xml | 10994 | 2023-01-13 16:06:52 |
| fibk-20230111_lab.xml | 23832 | 2023-01-13 16:06:52 |
| fibk-20230111_pre.xml | 12500 | 2023-01-13 16:06:52 |
| FilingSummary.xml | 1869 | 2023-01-13 16:06:52 |
| Financial_Report.xlsx | 5694 | 2023-01-13 16:06:52 |
| MetaLinks.json | 16906 | 2023-01-13 16:06:52 |
| R1.htm | 38100 | 2023-01-13 16:06:52 |
| report.css | 2766 | 2023-01-13 16:06:52 |
| Show.js | 1084 | 2023-01-13 16:06:52 |