Associated Banc-Corp is a U.S. regional bank holding company providing retail banking, commercial banking, commercial real estate lending, private banking, specialized financial services, and insurance services. It is headquartered in Green Bay, Wisconsin. It is the largest bank (by asset size) headquartered in Wisconsin. The banks main focus is middle-market commercial banking in Wisconsin, Illinois, Minnesota, and the upper Midwest. At September 30, 2016, it had $29 billion in assets and was one of the top 50 publicly traded U.S. bank holding companies. Associated Bank is a nationally chartered bank, regulated by the Office of the Comptroller of the Currency, Department of the Treasury. Associated Bank is a member of the Federal Deposit Insurance Corporation, the Federal Reserve Bank of Chicago and the Federal Home Loan Bank of Chicago. The company has approximately 4,500 employees. The Associated Banc-Corp holding company was formed on May 1, 1970 when three community banks formed a banking alliance that consolidated into Associated Bank. The three founding community banks were: The First National Bank of Neenah, founded in 1861; Kellogg Citizens National Bank, Green Bay, founded 1874; and Manitowoc Savings Bank, founded in 1884.