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First Security Bank

On July 22nd, Rocky Mountain Bank in Stevensville will become First Security Bank. Click here to learn more.
Our Corvallis branch is closed until further notice. We apologize for the inconvenience.

Take the first steps to becoming a Change Maker for good.

Open a Totally Free Checking Account and a $10 token
to make a positive impact in our community.

Don't be shy. Come check us out.

Totally Free Checking. Online, or on your device. Free debit card. Free from service charges. It's an embarrassment of riches.

Your New Online Banking Upgrade.

Say hello to a new and improved experience. 

Here for Life. 

First Security Bank is growing!

On July 22nd, Rocky Mountain Bank in Stevensville will become First Security Bank.

Your new adventure starts here. 

It's time to make a bold move. Let our Home Loan specialists finance your dreams.

Learn how to grow your money.

Our free Financial Foundations course makes it easy for you to gain a solid understanding of key financial concepts. We are committed to helping you build a strong financial future.  
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Financial Calculators

Tools to help you better understand your finances.

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Fraud Protection

 Learn how to protect yourself from fraud with good habits.

calendar iconHoliday Schedule

While we try to be open as much as possible, we do close a few days out of the year.

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Financial Foundations for Adults

Employment Opportunities

Donation request form

With branches in Missoula, Hamilton, Corvallis, Stevensville, Thompson Fall and Plains, First Security Bank proudly serves MIssoula, Sanders and Ravalli Counties.