Westamerica Bancorporation, also known as Westamerica Bank, is a regional and community bank that has its headquarters in Fairfield, California. The bank offers transaction services for personal accounts and many savings, checking and money market options for both corporations and small businesses alike. Westamerica Bank boasts 90 branches, 80 offices and 2 trust offices throughout 21 counties in Central and Northern California. Westamerica boasts $4.7 billion in assets, and in 2008, it was ranked third amongst all banks in the U.S. In the very same year, it also received the highest credit rating of AAA, classified as stable by Fitch Ratings.