Given that you clicked on this article, it seems safe to assume you either own stock in Zions Bancorp ( ZION -1.09% ) or are considering buying shares in the near future. If so, then you've come to the right place. The table below reveals the nine most critical numbers that investors need to know about Zions stock before deciding whether to buy, sell, or hold it. But before getting to that, a brief introduction is in order. To paraphrase the bank's website, Zions originated as Keystone Insurance and Investment Company, a Utah Corporation, in April 1955. In April 1960, Keystone, together with several individual investors, acquired a 57.5% interest in Zions First National Bank from the Mormon Church. In 1965, the bank's name was changed to Zions Bancorp -- though, it operated as Zions Utah Bancorporation from 1966 to 1987. Zions subsequently went public in January 1966.