---
schema_version: "secwatch.filing_event.v1"
accession: "0000860413-25-000155"
form_type: "8-K"
ticker: "FIBK"
cik: "0000860413"
company_name: "FIRST INTERSTATE BANCSYSTEM INC"
filed_at: "2025-10-16T23:59:59+00:00"
generated_at: "2026-05-17T03:38:51.992207+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# First Interstate selling 11 Nebraska branches to Security First; ~$280M deposits, ~$70M loans

## Summary
- Security First Bank acquiring 11 Nebraska branches from First Interstate Bank under purchase and assumption agreement.
- Branches had ~$280M in deposits and ~$70M in outstanding loans as of Sept. 30, 2025.
- Transaction subject to regulatory approval; expected to close in early 2026.
- First Interstate cites opportunity to redeploy capital toward stronger markets.
- Security First will expand to 34 full-service Nebraska branches post-acquisition.

## SEC filing metadata
- accession: 0000860413-25-000155
- form_type: 8-K
- ticker: FIBK
- cik: 0000860413
- company_name: FIRST INTERSTATE BANCSYSTEM INC
- filed_at: 2025-10-16T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/860413/000086041325000155/0000860413-25-000155-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/860413/000086041325000155/fibk-20251016.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000860413-25-000155
- JSON: https://secwatch.observer/filing/0000860413-25-000155.json
- Plain text: https://secwatch.observer/filing/0000860413-25-000155.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.