EXHIBIT 23.7 CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS --------------------------------------------------- We consent to the incorporation by reference in this Registration Statement on Form S-4, our report dated January 14, 1994, appearing in the Westamerica/PV Financial Registration Statement on Form S-4 (File No. 33-55417) filed on October 5, 1994 with the Securities and Exchange Commission pursuant to the Securities Act of 1933. /s/ Grant Thornton Stockton, California December 21, 1994