1 EXHIBIT 23.3 INDEPENDENT AUDITOR'S CONSENT We consent to the incorporation by reference in this Registration Statement No. 333-64741, Amendment Number 1, of Westbank Corporation (the "Company") on Form S-4 of our report dated February 6, 1998 incorporated by reference in the Company's 1997 Annual Report on Form 10-K and appearing in the Company's 1997 Annual Report to Shareholders and to the reference to us under the heading "Experts" in the Proxy Statement-Prospectus, which is part of this Registration Statement. /s/ Deloitte & Touche LLP DELOITTE & TOUCHE LLP Hartford, CT November 2, 1998