Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-23-000052-index-headers.html | 2023-03-16 12:39:42 | |
| 0000860413-23-000052-index.html | 2023-03-16 12:39:42 | |
| 0000860413-23-000052.txt | 2023-03-16 12:39:42 | |
 0000860413-23-000052-xbrl.zip | 22577 | 2023-03-16 12:39:42 |
| fibk-20230310.htm | 34940 | 2023-03-16 12:39:42 |
| fibk-20230310.xsd | 1890 | 2023-03-16 12:39:42 |
| fibk-20230310_htm.xml | 4277 | 2023-03-16 12:39:42 |
| fibk-20230310_lab.xml | 25138 | 2023-03-16 12:39:42 |
| fibk-20230310_pre.xml | 13035 | 2023-03-16 12:39:42 |
| fibk-ex31_2ndamendmenttoth.htm | 72820 | 2023-03-16 12:39:42 |
| FilingSummary.xml | 1917 | 2023-03-16 12:39:42 |
| Financial_Report.xlsx | 5720 | 2023-03-16 12:39:42 |
| MetaLinks.json | 17472 | 2023-03-16 12:39:42 |
| R1.htm | 39611 | 2023-03-16 12:39:42 |
| report.css | 2767 | 2023-03-16 12:39:42 |
| Show.js | 1084 | 2023-03-16 12:39:42 |