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 0000860413-20-000140-index-headers.html | 2020-05-13 21:34:39 | |
| 0000860413-20-000140-index.html | 2020-05-13 21:34:39 | |
| 0000860413-20-000140.txt | 2020-05-13 21:34:39 | |
 0000860413-20-000140-xbrl.zip | 58806 | 2020-05-13 21:34:39 |
| ex11-ua.htm | 230677 | 2020-05-13 21:34:39 |
| ex51-kjensenopinion.htm | 17485 | 2020-05-13 21:34:39 |
| ex52-polsinelliopinion.htm | 18043 | 2020-05-13 21:34:39 |
| ex991-prsubdebtpricing.htm | 11085 | 2020-05-13 21:34:39 |
| fibk-20200513.xsd | 4419 | 2020-05-13 21:34:39 |
| fibk-20200513x8k.htm | 66866 | 2020-05-13 21:34:39 |
| fibk-20200513x8k_htm.xml | 4324 | 2020-05-13 21:34:39 |
| fibk-20200513_cal.xml | 600 | 2020-05-13 21:34:39 |
| fibk-20200513_def.xml | 1450 | 2020-05-13 21:34:39 |
| fibk-20200513_lab.xml | 26142 | 2020-05-13 21:34:39 |
| fibk-20200513_pre.xml | 13556 | 2020-05-13 21:34:39 |
 fibk_logo.jpg | 165531 | 2020-05-13 21:34:39 |
| FilingSummary.xml | 1840 | 2020-05-13 21:34:39 |
| Financial_Report.xlsx | 5789 | 2020-05-13 21:34:39 |
| MetaLinks.json | 18109 | 2020-05-13 21:34:39 |
 polsinellilogoa02.jpg | 25361 | 2020-05-13 21:34:39 |
| R1.htm | 38610 | 2020-05-13 21:34:39 |
| report.css | 2767 | 2020-05-13 21:34:39 |
| Show.js | 1085 | 2020-05-13 21:34:39 |