Westamerica Bancorporation is a bank holding company. The Company provides a full range of banking services to individual and commercial customers in Northern and Central California through its subsidiary bank, Westamerica Bank (the Bank). The Bank is a California-chartered commercial bank. The principal communities served are located in Northern and Central California, from Mendocino, Lake and Nevada Counties in the north to Kern County in the south. In addition, the Bank owns 100% of the capital stock of Community Banker Services Corporation (CBSC), a company engaged in providing the Company and its subsidiaries with data processing services and other support functions. It provides a range of loans, including commercial loans, commercial real estate loans, real estate construction loans and residential real estate loans. The Company owns 26 banking office locations and one centralized administrative service center facility and leases 55 facilities.