Welcome to Security State Bank! Security State Bank has been providing banking services to local residents, farm families, and business and industry in Lewis County and the surrounding counties since 1903.Security State Bank customers enjoy the convenience of local banking. With 12 branch locations in Centralia, Chehalis, Morton, Winlock, Rochester, Pe Ell, Raymond, South Bend and Grayland, Saturday banking hours, extended hours, and the ease of the Bank's 24-hour ATMs, automated telephone banking and internet banking services, Security State Bank is ready to assist you with all of your banking needs, from checking accounts to home loans.