Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-24-000106-index-headers.html | 2024-06-14 06:56:50 | |
| 0000860413-24-000106-index.html | 2024-06-14 06:56:50 | |
| 0000860413-24-000106.txt | 2024-06-14 06:56:50 | |
 0000860413-24-000106-xbrl.zip | 13578 | 2024-06-14 06:56:50 |
| fibk-20240614.htm | 32693 | 2024-06-14 06:56:50 |
| fibk-20240614.xsd | 1892 | 2024-06-14 06:56:50 |
| fibk-20240614xex991pr.htm | 12018 | 2024-06-14 06:56:50 |
| fibk-20240614_htm.xml | 2723 | 2024-06-14 06:56:50 |
| fibk-20240614_lab.xml | 21885 | 2024-06-14 06:56:50 |
| fibk-20240614_pre.xml | 12502 | 2024-06-14 06:56:50 |
 fibslogo2linea04.jpg | 165531 | 2024-06-14 06:56:50 |
| FilingSummary.xml | 1623 | 2024-06-14 06:56:50 |
| Financial_Report.xlsx | 5693 | 2024-06-14 06:56:50 |
| MetaLinks.json | 16850 | 2024-06-14 06:56:50 |
| R1.htm | 38097 | 2024-06-14 06:56:50 |
| report.css | 2767 | 2024-06-14 06:56:50 |
| Show.js | 1085 | 2024-06-14 06:56:50 |