Guaranty Bank is a local full-service bank, which strives to have a positive impact through volunteerism, philanthropy, and a responsible approach to financial services. Guaranty is dedicated to meeting the financial needs of the surrounding community and exceeding expectations of customers. With the addition of Guaranty Bank, QCR Holdings has 40 locations in Iowa, Missouri, Wisconsin, and Illinois. Member FDIC. Equal Housing Lender. This page is to provide general information about Guaranty Bank. Never disclose personal or financial information on LinkedIn. This includes personal information such as account numbers, social security numbers and other non-public information.