EXHIBIT 23.1 INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in this Registration Statement of SJNB Financial Corp. on Form S-8 of our report dated January 15, 1998, appearing in the Annual Report on Form 10-K of SJNB Financial Corp. for the year ended December 31, 1997. KPMG PEAT MARWICK LLP San Jose, California June 25, 1998