Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-23-000019-index-headers.html | 2023-02-10 07:59:23 | |
| 0000860413-23-000019-index.html | 2023-02-10 07:59:23 | |
| 0000860413-23-000019.txt | 2023-02-10 07:59:23 | |
 0000860413-23-000019-xbrl.zip | 11228 | 2023-02-10 07:59:23 |
| fibk-20230209.htm | 38681 | 2023-02-10 07:59:23 |
| fibk-20230209.xsd | 1890 | 2023-02-10 07:59:23 |
| fibk-20230209_htm.xml | 10994 | 2023-02-10 07:59:23 |
| fibk-20230209_lab.xml | 23832 | 2023-02-10 07:59:23 |
| fibk-20230209_pre.xml | 12500 | 2023-02-10 07:59:23 |
| FilingSummary.xml | 1601 | 2023-02-10 07:59:23 |
| Financial_Report.xlsx | 5696 | 2023-02-10 07:59:23 |
| MetaLinks.json | 16906 | 2023-02-10 07:59:23 |
| R1.htm | 38101 | 2023-02-10 07:59:23 |
| report.css | 2766 | 2023-02-10 07:59:23 |
| Show.js | 1084 | 2023-02-10 07:59:23 |