Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-22-000141-index-headers.html | 2022-05-27 12:54:22 | |
| 0000860413-22-000141-index.html | 2022-05-27 12:54:22 | |
| 0000860413-22-000141.txt | 2022-05-27 12:54:22 | |
 0000860413-22-000141-xbrl.zip | 11716 | 2022-05-27 12:54:22 |
| fibk-20220525.htm | 57932 | 2022-05-27 12:54:22 |
| fibk-20220525.xsd | 1890 | 2022-05-27 12:54:22 |
| fibk-20220525_htm.xml | 10988 | 2022-05-27 12:54:22 |
| fibk-20220525_lab.xml | 24137 | 2022-05-27 12:54:22 |
| fibk-20220525_pre.xml | 12500 | 2022-05-27 12:54:22 |
| FilingSummary.xml | 1601 | 2022-05-27 12:54:22 |
| Financial_Report.xlsx | 5671 | 2022-05-27 12:54:22 |
| MetaLinks.json | 16416 | 2022-05-27 12:54:22 |
| R1.htm | 38699 | 2022-05-27 12:54:22 |
| report.css | 2766 | 2022-05-27 12:54:22 |
| Show.js | 1084 | 2022-05-27 12:54:22 |