Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-23-000194-index-headers.html | 2023-12-01 11:11:03 | |
| 0000860413-23-000194-index.html | 2023-12-01 11:11:03 | |
| 0000860413-23-000194.txt | 2023-12-01 11:11:03 | |
 0000860413-23-000194-xbrl.zip | 30865 | 2023-12-01 11:11:03 |
| fibk-20231130.htm | 37606 | 2023-12-01 11:11:03 |
| fibk-20231130.xsd | 1892 | 2023-12-01 11:11:03 |
| fibk-20231130xex101_meyerx.htm | 111736 | 2023-12-01 11:11:03 |
| fibk-20231130_htm.xml | 2723 | 2023-12-01 11:11:03 |
| fibk-20231130_lab.xml | 24139 | 2023-12-01 11:11:03 |
| fibk-20231130_pre.xml | 12502 | 2023-12-01 11:11:03 |
| fibk-20231201xex991pr_meyer.htm | 9533 | 2023-12-01 11:11:03 |
 fibslogo2linea04.jpg | 165531 | 2023-12-01 11:11:03 |
| FilingSummary.xml | 1618 | 2023-12-01 11:11:03 |
| Financial_Report.xlsx | 5690 | 2023-12-01 11:11:03 |
| MetaLinks.json | 16850 | 2023-12-01 11:11:03 |
| R1.htm | 38092 | 2023-12-01 11:11:03 |
| report.css | 2767 | 2023-12-01 11:11:03 |
| Show.js | 1085 | 2023-12-01 11:11:03 |