Welcome First Interstate Bank Customers

If you are a First Interstate Bank customer, your accounts will transition to Security First Bank as part of a scheduled acquisition on April 10, 2026.

As we prepare for this transition, important information including key dates, service updates, and any actions you may need to take, is available in one place.

To ensure a smooth experience, we encourage you to review your Welcome Guide and visit our dedicated transition page for the most up-to-date details.

Visit the Transition Resource Page: security1stbank.com/welcome-conversion

This page includes:

• Key transition dates and service availability
• Steps you may need to complete before and after conversion
• Online and Mobile Banking instructions
• Contact information and support resources

If you have questions, our team is here to help. Please contact your local branch or call 877-747-3139.

We look forward to welcoming you to Security First Bank.