Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-20-000044-index-headers.html | 2020-02-21 16:41:40 | |
| 0000860413-20-000044-index.html | 2020-02-21 16:41:40 | |
| 0000860413-20-000044.txt | 2020-02-21 16:41:40 | |
 0000860413-20-000044-xbrl.zip | 16537 | 2020-02-21 16:41:40 |
| ex991-pr20200221.htm | 12233 | 2020-02-21 16:41:40 |
| fibk-20200221.xsd | 4557 | 2020-02-21 16:41:40 |
| fibk-20200221_cal.xml | 600 | 2020-02-21 16:41:40 |
| fibk-20200221_def.xml | 1450 | 2020-02-21 16:41:40 |
| fibk-20200221_lab.xml | 26142 | 2020-02-21 16:41:40 |
| fibk-20200221_pre.xml | 13556 | 2020-02-21 16:41:40 |
| fibk-8kx20200221boardt.htm | 50659 | 2020-02-21 16:41:40 |
| fibk-8kx20200221boardt_htm.xml | 4344 | 2020-02-21 16:41:40 |
 fibslogolockup2lineltbkgdrgb.jpg | 165531 | 2020-02-21 16:41:40 |
| FilingSummary.xml | 1743 | 2020-02-21 16:41:40 |
| Financial_Report.xlsx | 5789 | 2020-02-21 16:41:40 |
| MetaLinks.json | 18196 | 2020-02-21 16:41:40 |
| R1.htm | 38617 | 2020-02-21 16:41:40 |
| report.css | 2766 | 2020-02-21 16:41:40 |
| Show.js | 1085 | 2020-02-21 16:41:40 |