Columbia Banking System, Inc. is a financial services company primarily engaged in banking operations. It serves as the holding company for Columbia State Bank, offering a broad portfolio of banking p... Columbia Banking System, Inc. is a financial services company primarily engaged in banking operations. It serves as the holding company for Columbia State Bank, offering a broad portfolio of banking products and services to both personal and business clients. These services include checking and savings accounts, online banking, credit and loan facilities, ATM operations, wealth management, and investment management services. The company operates over 140 branches across Washington, Oregon, and Idaho. As a key player in the financial sector, Columbia Banking System, Inc. plays a significant role in supporting local economies through its banking services. Headquartered in Tacoma, Washington, the company contributes to the stability and growth of regional financial markets.