Zions Bancorporation is a bank holding company headquartered in Salt Lake City, Utah. Zions Bancorporation originated as Keystone Insurance and Investment Co., a Utah Corporation, in April 1955. In April 1960, Keystone, together with several individual investors, acquired a 57.5 percent interest in Zions First National Bank from the LDS Church. In 1965, the name of the company was changed to Zions Bancorporation. The first public offering of shares in Zions Bancorporation was made in January 1966. There continued to be some minority shareholders until April 1972, when the company exchanged the remaining minority shares for common shares. In 2018, Zions Bancorporation merged into its bank subsidiary, ZB, N.A., which was then renamed Zions Bancorporation, N.A. Zions Bancorporation now operates as a national bank doing business under eight local brands, rather than as a holding company.