Press Release

First Interstate BancSystem, Inc. Announces Dividend

Company Release - 6/19/2012 4:00 PM ET

BILLINGS, Mont.--(BUSINESS WIRE)-- First Interstate BancSystem, Inc.'s (Nasdaq: FIBK) Executive Committee of the Board of Directors, at a meeting held on June 18, 2012, declared a dividend of $0.12 per common share. The dividend is payable on July 16, 2012 to owners of record on July 2, 2012.

First Interstate BancSystem, Inc. is a financial services holding company, headquartered in Billings, Montana, with $7.4 billion in assets as of March 30, 2012. It is the parent company of First Interstate Bank, a community bank operating 72 offices throughout Montana, Wyoming, and South Dakota. A recognized leader in community banking services with 24 consecutive years of profitability, First Interstate remains a family business whose culture is driven by strong family and corporate values, as well as a commitment to long-term organic growth, exemplary customer service, exceeding customer expectations through its products and services and supporting with leadership and resources, the communities it serves.

First Interstate BancSystem, Inc.
Marcy Mutch, Investor Relations, +1 406-255-5322

Source: First Interstate BancSystem, Inc.