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|---|---|---|
 0000860413-23-000126-index-headers.html | 2023-05-25 17:21:08 | |
| 0000860413-23-000126-index.html | 2023-05-25 17:21:08 | |
| 0000860413-23-000126.txt | 2023-05-25 17:21:08 | |
 0000860413-23-000126-xbrl.zip | 20119 | 2023-05-25 17:21:08 |
| a2022shmtgpres.htm | 29815 | 2023-05-25 17:21:08 |
 a2022shmtgpres001.jpg | 318593 | 2023-05-25 17:21:08 |
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 a2022shmtgpres010.jpg | 168175 | 2023-05-25 17:21:08 |
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 a2022shmtgpres020.jpg | 132743 | 2023-05-25 17:21:08 |
 a2022shmtgpres021.jpg | 111985 | 2023-05-25 17:21:08 |
| fibk-20230524.htm | 39357 | 2023-05-25 17:21:08 |
| fibk-20230524.xsd | 1890 | 2023-05-25 17:21:08 |
| fibk-20230524_htm.xml | 11000 | 2023-05-25 17:21:08 |
| fibk-20230524_lab.xml | 24137 | 2023-05-25 17:21:08 |
| fibk-20230524_pre.xml | 12500 | 2023-05-25 17:21:08 |
| FilingSummary.xml | 1637 | 2023-05-25 17:21:08 |
| Financial_Report.xlsx | 5690 | 2023-05-25 17:21:08 |
| MetaLinks.json | 16948 | 2023-05-25 17:21:08 |
| R1.htm | 38091 | 2023-05-25 17:21:08 |
| report.css | 2767 | 2023-05-25 17:21:08 |
| Show.js | 1085 | 2023-05-25 17:21:08 |