Summit State Bank (California)is a state chartered commercial bank. It provides an array of financial services to small & medium-sized businesses, their owners & employees, entrepreneurs, high net worth families, foundations, estates and individual consumers. Read More The firm specializes in business services, personal accounts, nonprofit programs, and mobile banking ranging from lending. checking, merchant, eBanking, automated teller machines, equity loans, and others. The company was founded on December 20, 1982 and is headquartered in Santa Rosa, CA.