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american bank's history

American Bank is a locally-owned and operated Montana bank with branches in Bozeman, Livingston, Whitefish, Big Timber and Big Sky. We're proud to have served Montanans for more than 70 years. 

Bank postcard with the logo A Progressive Independent Bank.


bank established

Claude R. Erickson founded Livingston State Bank in June of 1947. Claude was known for his firm handshake and his favorite saying, "Shake the hand of the honest man." 


holding company formed 

The bank holding company, Guaranty Development Company, was formed in November of 1964.
An envelope from Livingston State Bank dated July 20, 1961.
Old photo of First Security Bank in Montana


name changed

In January of 1966, Livingston State Bank changed its name to First Security Bank of Livingston.


purchase of Big timber branch 

The bank acquired First State Bank of Big Timber in August of 1978. We changed its  name to First Security Bank of Big Timber the following February, 

Also at this time, Claude hired on his son Bruce A. Erickson. 


purchase of billings branch 

We acquired Western State Bank of Billings in February of 1983, and renamed the branch American Bank of Billings that November. The other two branch names remained the same. 


purchase of first bozeman branch 

In November of 1992, we purchased Interwest Bank of Montana, allowing us to open our West Main Bozeman branch.

American Bank name Established bank-wide

Also in 1992, we officially renamed all of our branches American Bank.



We opened up our first Whitefish location in September of 1995.



We sold our Billings branch in December of 1997. 


Big Sky Branch Opened

We opened our Big Sky branch in January of 1999. 


Second Bozeman Branch Opened

We opened our East Main branch in Bozeman in November of 2000.


New Whitefish Branch Opened

For a short period of time, we had two branches in Whitefish, and by July of 2003, we transitioned into the larger branch on Baker Street. 


New Big sky Branch Opened

We moved to a new space in the Meadow Village Center.

American Bank is still owned by the Ericksons, the same family who opened Livingston State Bank in 1947. Claude’s grandchildren, Tyler and Taylor, are both on the board of directors, and Tyler works in the bank today. We remain dedicated to caring for our customers, employees and communities.