Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-22-000186-index-headers.html | 2022-07-26 16:11:22 | |
| 0000860413-22-000186-index.html | 2022-07-26 16:11:22 | |
| 0000860413-22-000186.txt | 2022-07-26 16:11:22 | |
 0000860413-22-000186-xbrl.zip | 60091 | 2022-07-26 16:11:22 |
| fibk-20220630x8kpr.htm | 851939 | 2022-07-26 16:11:22 |
| fibk-20220726.htm | 41380 | 2022-07-26 16:11:22 |
| fibk-20220726.xsd | 1890 | 2022-07-26 16:11:22 |
| fibk-20220726_htm.xml | 10993 | 2022-07-26 16:11:22 |
| fibk-20220726_lab.xml | 24137 | 2022-07-26 16:11:22 |
| fibk-20220726_pre.xml | 12500 | 2022-07-26 16:11:22 |
 fibslogo2linea04a.jpg | 165531 | 2022-07-26 16:11:22 |
| FilingSummary.xml | 1672 | 2022-07-26 16:11:22 |
| Financial_Report.xlsx | 5698 | 2022-07-26 16:11:22 |
| jul2022ip.htm | 33778 | 2022-07-26 16:11:22 |
 jul2022ip001.jpg | 292506 | 2022-07-26 16:11:22 |
 jul2022ip002.jpg | 282376 | 2022-07-26 16:11:22 |
 jul2022ip003.jpg | 92863 | 2022-07-26 16:11:22 |
 jul2022ip004.jpg | 146292 | 2022-07-26 16:11:22 |
 jul2022ip005.jpg | 94635 | 2022-07-26 16:11:22 |
 jul2022ip006.jpg | 91162 | 2022-07-26 16:11:22 |
 jul2022ip007.jpg | 73185 | 2022-07-26 16:11:22 |
 jul2022ip008.jpg | 107251 | 2022-07-26 16:11:22 |
 jul2022ip009.jpg | 80989 | 2022-07-26 16:11:22 |
 jul2022ip010.jpg | 88767 | 2022-07-26 16:11:22 |
 jul2022ip011.jpg | 100716 | 2022-07-26 16:11:22 |
 jul2022ip012.jpg | 70040 | 2022-07-26 16:11:22 |
 jul2022ip013.jpg | 55452 | 2022-07-26 16:11:22 |
 jul2022ip014.jpg | 85712 | 2022-07-26 16:11:22 |
 jul2022ip015.jpg | 101417 | 2022-07-26 16:11:22 |
 jul2022ip016.jpg | 102008 | 2022-07-26 16:11:22 |
 jul2022ip017.jpg | 281816 | 2022-07-26 16:11:22 |
 jul2022ip018.jpg | 114650 | 2022-07-26 16:11:22 |
 jul2022ip019.jpg | 105938 | 2022-07-26 16:11:22 |
 jul2022ip020.jpg | 88202 | 2022-07-26 16:11:22 |
 jul2022ip021.jpg | 84995 | 2022-07-26 16:11:22 |
| MetaLinks.json | 16416 | 2022-07-26 16:11:22 |
| R1.htm | 38552 | 2022-07-26 16:11:22 |
| report.css | 2767 | 2022-07-26 16:11:22 |
| Show.js | 1085 | 2022-07-26 16:11:22 |