First Interstate BancSystem, Inc. is a financial and bank holding company. The Company, through its bank subsidiary First Interstate Bank (the Bank), delivers a range of banking products and services to individuals, businesses, municipalities and other entities. The Company operates through community banking segment. Its community banking segment provides customers with commercial and consumer banking products and services in its market areas through community service activities. The Company also offers Internet and mobile banking services. In addition to its primary emphasis on commercial and consumer banking services, the Company also offers trust, employee benefit, investment and insurance services through its bank subsidiary. It operates approximately 80 banking offices, including detached drive up facilities, in over 40 communities located in Montana, Wyoming and western South Dakota.