Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000860413-21-000160-index-headers.html | 2021-05-26 13:27:19 | |
| 0000860413-21-000160-index.html | 2021-05-26 13:27:19 | |
| 0000860413-21-000160.txt | 2021-05-26 13:27:19 | |
 0000860413-21-000160-xbrl.zip | 18326 | 2021-05-26 13:27:19 |
| fibk-20210526.htm | 38734 | 2021-05-26 13:27:19 |
| fibk-20210526.xsd | 1890 | 2021-05-26 13:27:19 |
| fibk-20210526_htm.xml | 10897 | 2021-05-26 13:27:19 |
| fibk-20210526_lab.xml | 24137 | 2021-05-26 13:27:19 |
| fibk-20210526_pre.xml | 12500 | 2021-05-26 13:27:19 |
| fibkshpres2.htm | 22623 | 2021-05-26 13:27:19 |
 fibkshpres2001.jpg | 153398 | 2021-05-26 13:27:19 |
 fibkshpres2002.jpg | 265260 | 2021-05-26 13:27:19 |
 fibkshpres2003.jpg | 123470 | 2021-05-26 13:27:19 |
 fibkshpres2004.jpg | 71436 | 2021-05-26 13:27:19 |
 fibkshpres2005.jpg | 59027 | 2021-05-26 13:27:19 |
 fibkshpres2006.jpg | 109202 | 2021-05-26 13:27:19 |
 fibkshpres2007.jpg | 70467 | 2021-05-26 13:27:19 |
 fibkshpres2008.jpg | 95453 | 2021-05-26 13:27:19 |
 fibkshpres2009.jpg | 102692 | 2021-05-26 13:27:19 |
 fibkshpres2010.jpg | 66313 | 2021-05-26 13:27:19 |
 fibkshpres2011.jpg | 126324 | 2021-05-26 13:27:19 |
 fibkshpres2012.jpg | 126419 | 2021-05-26 13:27:19 |
 fibkshpres2013.jpg | 96020 | 2021-05-26 13:27:19 |
 fibkshpres2014.jpg | 101749 | 2021-05-26 13:27:19 |
 fibkshpres2015.jpg | 143251 | 2021-05-26 13:27:19 |
 fibkshpres2016.jpg | 131925 | 2021-05-26 13:27:19 |
 fibkshpres2017.jpg | 79689 | 2021-05-26 13:27:19 |
 fibkshpres2018.jpg | 139027 | 2021-05-26 13:27:19 |
 fibkshpres2019.jpg | 64250 | 2021-05-26 13:27:19 |
 fibkshpres2020.jpg | 122671 | 2021-05-26 13:27:19 |
 fibkshpres2021.jpg | 142550 | 2021-05-26 13:27:19 |
| FilingSummary.xml | 1625 | 2021-05-26 13:27:19 |
| Financial_Report.xlsx | 5677 | 2021-05-26 13:27:19 |
| MetaLinks.json | 16583 | 2021-05-26 13:27:19 |
| R1.htm | 38582 | 2021-05-26 13:27:19 |
| report.css | 2767 | 2021-05-26 13:27:19 |
| Show.js | 1085 | 2021-05-26 13:27:19 |