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|---|---|---|
 0000860413-22-000130-index-headers.html | 2022-04-28 17:25:49 | |
| 0000860413-22-000130-index.html | 2022-04-28 17:25:49 | |
| 0000860413-22-000130.txt | 2022-04-28 17:25:49 | |
 0000860413-22-000130-xbrl.zip | 57359 | 2022-04-28 17:25:49 |
| apr2022ip.htm | 38684 | 2022-04-28 17:25:49 |
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 apr2022ip024.jpg | 85714 | 2022-04-28 17:25:49 |
| fibk-20220331x8kpr.htm | 723867 | 2022-04-28 17:25:49 |
| fibk-20220428.htm | 41373 | 2022-04-28 17:25:49 |
| fibk-20220428.xsd | 1902 | 2022-04-28 17:25:49 |
| fibk-20220428_htm.xml | 10983 | 2022-04-28 17:25:49 |
| fibk-20220428_lab.xml | 24275 | 2022-04-28 17:25:49 |
| fibk-20220428_pre.xml | 12638 | 2022-04-28 17:25:49 |
 fibslogo2linea04.jpg | 165531 | 2022-04-28 17:25:49 |
| FilingSummary.xml | 1678 | 2022-04-28 17:25:49 |
| Financial_Report.xlsx | 5676 | 2022-04-28 17:25:49 |
| MetaLinks.json | 16736 | 2022-04-28 17:25:49 |
| R1.htm | 38754 | 2022-04-28 17:25:49 |
| report.css | 2767 | 2022-04-28 17:25:49 |
| Show.js | 1085 | 2022-04-28 17:25:49 |