Exhibit 23.1

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRMS' CONSENT

We consent to the incorporation by reference in Registration Statements No.
333-104458 and 333-01649 of West Coast Bancorp on Form S-8 of our report dated
June 25, 2004, appearing in this Annual Report on Form 11-K of the West Coast
Bancorp 401(k) Plan for the year ended December 31, 2003.

DELOITTE & TOUCHE LLP

Portland, Oregon
June 25, 2004