Description Summit Bancshares wants your business to operate at peak performance. Holding company Summit Bancshares does business through its primary subsidiary Summit Bank, which operates four branch offices in the East Bay communities of Emeryville, Oakland, and Walnut Creek, California. The bank targets professionals, entrepreneurs, and executives and their businesses, offering them standard business and personal checking and savings accounts as well as commercial loans and online banking. It also offers courier service for its busy business-owner customers. Summit Bancshares was formed in 1981.