Westamerica Bancorporation operates as the bank holding company for Westamerica Bank that provides various banking products and services to individual and corporate customers. It accepts various deposit products, such as retail savings and checking accounts; interest and non-interest bearing demand deposits; money market checking deposits; and certificates of deposit. The company’s loan portfolio includes commercial loans, commercial and residential real estate loans, construction loans, and consumer installment and other loans. It operates through a network of 92 branch offices in 21 counties in northern and central California. The company was formerly known as Independent Bankshares Corporation and changed its name to Westamerica Bancorporation in 1983. Westamerica Bancorporation was founded in 1972 and is headquartered in San Rafael, California.