Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-23-000165-index-headers.html | 2023-06-30 17:21:33 | |
| 0000860413-23-000165-index.html | 2023-06-30 17:21:33 | |
| 0000860413-23-000165.txt | 2023-06-30 17:21:33 | |
 0000860413-23-000165-xbrl.zip | 9624 | 2023-06-30 17:21:33 |
| fibk-20230628.htm | 31115 | 2023-06-30 17:21:33 |
| fibk-20230628.xsd | 1892 | 2023-06-30 17:21:33 |
| fibk-20230628_htm.xml | 4114 | 2023-06-30 17:21:33 |
| fibk-20230628_lab.xml | 24139 | 2023-06-30 17:21:33 |
| fibk-20230628_pre.xml | 12502 | 2023-06-30 17:21:33 |
| FilingSummary.xml | 1601 | 2023-06-30 17:21:33 |
| Financial_Report.xlsx | 5697 | 2023-06-30 17:21:33 |
| MetaLinks.json | 16948 | 2023-06-30 17:21:33 |
| R1.htm | 38092 | 2023-06-30 17:21:33 |
| report.css | 2766 | 2023-06-30 17:21:33 |
| Show.js | 1084 | 2023-06-30 17:21:33 |