Frontier Credit Union to acquire Montana bank

The following is a news release from Frontier Credit Union.

IDAHO FALLS — Frontier Credit Union, led by Montana-native Dan Thurman, has entered into an agreement to acquire First Citizens Bank of Butte, the wholly-owned subsidiary of Butte Bank Shares, Inc., marking its first expansion into the Treasure State.

Headquartered in Idaho Falls, this strategic move would bring Frontier’s 90-year legacy of member-focused financial services to a new market while honoring First Citizens Bank of Butte’s community banking tradition.

The acquisition would provide First Citizens Bank of Butte customers with access to Frontier’s full suite of financial products, enhanced technology, competitive rates, and quick online loan applications—all while maintaining a commitment to personalized, community-focused service.

“As we bring Frontier to Montana, we’re not just expanding our footprint—we’re extending our mission of helping people build better lives,” said Dan Thurman. “Having grown up in Dillon, it’s a dream having this chance to share Frontier with my home state. We can’t wait to be a part of the fabric here in Butte and serve this great community.”

“This transaction brings tremendous opportunities for our customers and employees,” said First Citizens Bank of Butte CEO, Casey Reilly. “It’s a natural fit—I’m excited our customers will be in the hands of someone who knows what makes Montana special. They know our community, share our values, and appreciate the uniqueness of Butte.”

The transaction is subject to the approval of bank and credit union regulators and the shareholders of Butte Bank Shares, Inc. Until the proposed acquisition is finalized, both organizations will continue to conduct business as usual.

First Citizens Bank of Butte customers can expect to hear from their banking team during the transition and the local branch will remain open during this time, keeping the personalized banking experience that customers value.