# Filing Detail

Form DEF 14A - Other definitive proxy statements:
SEC Accession No. 0000860413-25-000045
Filing Date
2025-04-08
Accepted
2025-04-08 16:03:39
Documents
63
Period of Report
2025-04-08

Document Format Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
1 | DEF 14A | fibk-20250408.htm iXBRL | DEF 14A | 4003078
6 | GRAPHIC | fibk-20250408_g1.jpg | GRAPHIC | 48081
7 | GRAPHIC | fibk-20250408_g10.gif | GRAPHIC | 145471
8 | GRAPHIC | fibk-20250408_g11.gif | GRAPHIC | 271078
9 | GRAPHIC | fibk-20250408_g12.jpg | GRAPHIC | 642561
10 | GRAPHIC | fibk-20250408_g13.jpg | GRAPHIC | 930389
11 | GRAPHIC | fibk-20250408_g14.jpg | GRAPHIC | 87612
12 | GRAPHIC | fibk-20250408_g15.jpg | GRAPHIC | 557615
13 | GRAPHIC | fibk-20250408_g16.jpg | GRAPHIC | 146890
14 | GRAPHIC | fibk-20250408_g17.jpg | GRAPHIC | 156881
15 | GRAPHIC | fibk-20250408_g18.jpg | GRAPHIC | 138498
16 | GRAPHIC | fibk-20250408_g19.jpg | GRAPHIC | 142877
17 | GRAPHIC | fibk-20250408_g2.jpg | GRAPHIC | 2035675
18 | GRAPHIC | fibk-20250408_g20.jpg | GRAPHIC | 139568
19 | GRAPHIC | fibk-20250408_g21.jpg | GRAPHIC | 140784
20 | GRAPHIC | fibk-20250408_g22.jpg | GRAPHIC | 145222
21 | GRAPHIC | fibk-20250408_g23.jpg | GRAPHIC | 145574
22 | GRAPHIC | fibk-20250408_g24.jpg | GRAPHIC | 150950
23 | GRAPHIC | fibk-20250408_g25.jpg | GRAPHIC | 141305
24 | GRAPHIC | fibk-20250408_g26.jpg | GRAPHIC | 142769
25 | GRAPHIC | fibk-20250408_g27.jpg | GRAPHIC | 153867
26 | GRAPHIC | fibk-20250408_g28.jpg | GRAPHIC | 162363
27 | GRAPHIC | fibk-20250408_g29.jpg | GRAPHIC | 158292
28 | GRAPHIC | fibk-20250408_g3.jpg | GRAPHIC | 7749
29 | GRAPHIC | fibk-20250408_g30.jpg | GRAPHIC | 143952
30 | GRAPHIC | fibk-20250408_g31.jpg | GRAPHIC | 170988
31 | GRAPHIC | fibk-20250408_g32.jpg | GRAPHIC | 115749
32 | GRAPHIC | fibk-20250408_g33.jpg | GRAPHIC | 170228
33 | GRAPHIC | fibk-20250408_g34.jpg | GRAPHIC | 153115
34 | GRAPHIC | fibk-20250408_g35.jpg | GRAPHIC | 165645
35 | GRAPHIC | fibk-20250408_g36.jpg | GRAPHIC | 160064
36 | GRAPHIC | fibk-20250408_g37.jpg | GRAPHIC | 165844
37 | GRAPHIC | fibk-20250408_g38.jpg | GRAPHIC | 343661
38 | GRAPHIC | fibk-20250408_g39.gif | GRAPHIC | 24433
39 | GRAPHIC | fibk-20250408_g4.jpg | GRAPHIC | 30698
40 | GRAPHIC | fibk-20250408_g40.gif | GRAPHIC | 30323
41 | GRAPHIC | fibk-20250408_g41.gif | GRAPHIC | 84835
42 | GRAPHIC | fibk-20250408_g42.gif | GRAPHIC | 77775
43 | GRAPHIC | fibk-20250408_g43.gif | GRAPHIC | 79447
44 | GRAPHIC | fibk-20250408_g44.jpg | GRAPHIC | 136046
45 | GRAPHIC | fibk-20250408_g45.jpg | GRAPHIC | 257823
46 | GRAPHIC | fibk-20250408_g46.jpg | GRAPHIC | 185341
47 | GRAPHIC | fibk-20250408_g47.jpg | GRAPHIC | 78001
48 | GRAPHIC | fibk-20250408_g5.jpg | GRAPHIC | 19606
49 | GRAPHIC | fibk-20250408_g6.jpg | GRAPHIC | 27808
50 | GRAPHIC | fibk-20250408_g7.jpg | GRAPHIC | 623891
51 | GRAPHIC | fibk-20250408_g8.gif | GRAPHIC | 72696
52 | GRAPHIC | fibk-20250408_g9.gif | GRAPHIC | 63037
| Complete submission text file | 0000860413-25-000045.txt |  | 30536147

Data Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
2 | XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT | fibk-20250408.xsd | EX-101.SCH | 4893
3 | XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT | fibk-20250408_def.xml | EX-101.DEF | 7546
4 | XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT | fibk-20250408_lab.xml | EX-101.LAB | 10712
5 | XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT | fibk-20250408_pre.xml | EX-101.PRE | 6181
65 | EXTRACTED XBRL INSTANCE DOCUMENT | fibk-20250408_htm.xml | XML | 226120

Mailing Address 401 NO 31ST STREET BILLINGS MT 59101
Business Address 401 NO 31ST STREET BILLINGS MT 59101 4062555311
FIRST INTERSTATE BANCSYSTEM INC (Filer) CIK: 0000860413 (see all company filings)

EIN.: 810331430 | State of Incorp.: DE | Fiscal Year End: 1231
Type: DEF 14A | Act: 34 | File No.: 001-34653 | Film No.: 25821916
SIC: 6022 State Commercial Banks
(CF Office: 02 Finance)