DOCUMENT AND ENTITY INFORMATION	9 Months Ended
	Sep. 30, 2012	Oct. 31, 2012
Entity Registrant Name	WEST COAST BANCORP /NEW/OR/
Entity Central Index Key	0000717059
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Trading Symbol	wcbo
Entity Common Stock, Shares Outstanding		19,290,175
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3