Summit Bancshares, Inc., through its subsidiary, Summit Bank, provides commercial credit and other banking services in California. It offers checking and savings accounts, and certificates of deposit. The company also provides commercial real estate, land development and construction, and commercial and consumer loans, as well as letters of credit. The company offers its products and services through branches to small and mid-sized businesses and professionals, including professional firms of physicians, attorneys, accountants, real estate developers, retailers, service firms, wholesalers, and distributors, as well as individuals. Summit Bancshares, Inc. was founded in 1982 and is based in Oakland, California.