First Interstate BancSystem, Inc. operates as the bank holding company for First Interstate Bank that provides range of banking products and services in the United States. It offers deposit products that include checking, savings, time, and demand deposits; and repurchase agreements primarily for commercial and municipal depositors. The company's loan portfolio consists of real estate loans, including commercial real estate, construction, land development, residential, agricultural, and other real estate loans; consumer loans; commercial loans; and other loans, including fixed and variable rate loans. It also provides a range of trust, employee benefit, investment management, insurance, agency, and custodial services to individuals, businesses, and nonprofit organizations, which include the administration of estates and personal trusts; management of investment accounts for individuals, employee benefit plans, and charitable foundations; and insurance planning. In addition, the company offers marketing, credit review, loan servicing, credit cards issuance and servicing, mortgage loan sales and servicing, indirect consumer loan purchasing and processing, and loan collection services, as well as online and mobile banking services. It serves individuals, businesses, municipalities, and other entities in various industries, including agriculture, construction, education, energy, governmental services, healthcare, hospitality, housing, mining, professional services, real estate development, retail, technology, tourism, and wholesale trade. As of December 31, 2020, the company operated 150 banking offices located in Idaho, Montana, Oregon, South Dakota, Washington, and Wyoming. First Interstate BancSystem, Inc. was incorporated in 1971 and is headquartered in Billings, Montana.