Westamerica Bancorporation operates as a bank holding company. It provides range of banking services to individual and corporate customers in Northern and Central California. It offers loans and lines of credit, online services, mobile banking, checking, savings, credit cards, cash management, overdraft services, merchant services, professional banking, bank owned property, preventing business loans, payroll services, and trust services. The company was founded in 1972 and is headquartered in San Rafael, CA.