Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-23-000174-index-headers.html | 2023-08-28 14:37:44 | |
| 0000860413-23-000174-index.html | 2023-08-28 14:37:44 | |
| 0000860413-23-000174.txt | 2023-08-28 14:37:44 | |
 0000860413-23-000174-xbrl.zip | 31064 | 2023-08-28 14:37:44 |
| fibk-20230824.htm | 37706 | 2023-08-28 14:37:44 |
| fibk-20230824.xsd | 1892 | 2023-08-28 14:37:44 |
| fibk-20230824x8kpr_asker.htm | 9883 | 2023-08-28 14:37:44 |
| fibk-20230824xex101_askerx.htm | 111724 | 2023-08-28 14:37:44 |
| fibk-20230824_htm.xml | 2731 | 2023-08-28 14:37:44 |
| fibk-20230824_lab.xml | 24139 | 2023-08-28 14:37:44 |
| fibk-20230824_pre.xml | 12502 | 2023-08-28 14:37:44 |
 fibslogo2linea04.jpg | 165531 | 2023-08-28 14:37:44 |
| FilingSummary.xml | 1695 | 2023-08-28 14:37:44 |
| Financial_Report.xlsx | 5697 | 2023-08-28 14:37:44 |
| MetaLinks.json | 16850 | 2023-08-28 14:37:44 |
| R1.htm | 38100 | 2023-08-28 14:37:44 |
| report.css | 2767 | 2023-08-28 14:37:44 |
| Show.js | 1085 | 2023-08-28 14:37:44 |