First Interstate BancSystem is a bank holding company operating a regional banking network across the western and midwestern United States through its principal subsidiary First Interstate Bank. The company provides a comprehensive range of banking products and services including deposit accounts, commercial and residential lending, wealth management, mortgage origination and servicing, and payment processing to individuals, businesses, government entities, and agricultural operations. The company generates revenue primarily from net interest income on its loan and investment portfolio, supplemented by noninterest income from wealth management fees, mortgage banking, payment services, and service charges on deposit accounts.