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| 0000860413-24-000111.txt | 2024-07-25 16:01:13 | |
 0000860413-24-000111-xbrl.zip | 53872 | 2024-07-25 16:01:13 |
| fibk-20240630x8kpr.htm | 784863 | 2024-07-25 16:01:13 |
| fibk-20240725.htm | 32897 | 2024-07-25 16:01:13 |
| fibk-20240725.xsd | 1892 | 2024-07-25 16:01:13 |
| fibk-20240725_htm.xml | 2723 | 2024-07-25 16:01:13 |
| fibk-20240725_lab.xml | 21885 | 2024-07-25 16:01:13 |
| fibk-20240725_pre.xml | 12502 | 2024-07-25 16:01:13 |
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