Westamerica Bancorporation operates as a bank holding company for Westamerica Bank that provides various banking products and services to individual and commercial customers in the United States. The company accepts various deposit products from local businesses and professionals, as well as retail savings and checking accounts, as well as certificates of deposit. Its loan portfolio includes commercial, commercial real estate, residential real estate, real estate construction, consumer installment loans, as well as indirect automobile loans. The company serves small businesses, professionals, and consumers. The company was formerly known as Independent Bankshares Corporation and changed its name to Westamerica Bancorporation in 1983. Westamerica Bancorporation was founded in 1884 and is headquartered in San Rafael, California.