Parent Directory| Name | Size | Last Modified |
|---|---|---|
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| 0000860413-24-000059-index.html | 2024-04-24 16:09:50 | |
| 0000860413-24-000059.txt | 2024-04-24 16:09:50 | |
 0000860413-24-000059-xbrl.zip | 54576 | 2024-04-24 16:09:50 |
| fibk-20240331x8kpr.htm | 784927 | 2024-04-24 16:09:50 |
| fibk-20240424.htm | 32899 | 2024-04-24 16:09:50 |
| fibk-20240424.xsd | 1892 | 2024-04-24 16:09:50 |
| fibk-20240424_htm.xml | 2723 | 2024-04-24 16:09:50 |
| fibk-20240424_lab.xml | 21885 | 2024-04-24 16:09:50 |
| fibk-20240424_pre.xml | 12502 | 2024-04-24 16:09:50 |
 fibslogo2linea04.jpg | 165531 | 2024-04-24 16:09:50 |
| FilingSummary.xml | 1621 | 2024-04-24 16:09:50 |
| Financial_Report.xlsx | 5692 | 2024-04-24 16:09:50 |
| mar2024ip.htm | 32703 | 2024-04-24 16:09:50 |
 mar2024ip001.jpg | 292402 | 2024-04-24 16:09:50 |
 mar2024ip002.jpg | 274105 | 2024-04-24 16:09:50 |
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 mar2024ip019.jpg | 107088 | 2024-04-24 16:09:50 |
| MetaLinks.json | 16850 | 2024-04-24 16:09:50 |
| R1.htm | 38096 | 2024-04-24 16:09:50 |
| report.css | 2767 | 2024-04-24 16:09:50 |
| Show.js | 1085 | 2024-04-24 16:09:50 |