Washington Bankers Association | 2,619 followers on LinkedIn. The WBA is the state’s largest financial services trade association, advocating for the needs and interests of banks. | Washington Bankers Association (WBA) was founded by bankers in 1889, and was incorporated in 1970. Through advocacy, comprehensive programming, and information exchange, WBA protects, develops, and advances the business of banking in Washington State. WBA represents commercial banks operating in every county of the state, ranging in size from large multi-state financial institutions to smaller, family-owned and community-based banks.