EXHIBIT 23.4 CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS We have issued our report dated February 7, 1997, accompanying the financial statements of Pinnacle Management & Trust Company contained in the Registration Statement and Proxy Statement/Prospectus. We consent to the use of the aforementioned report in the Registration Statement and Proxy Statement/Prospectus, and to the use of our name as it appears under the caption "Experts". GRANT THORNTON LLP Houston, Texas November 19, 1998