TACOMA, Wash., April 4, 2013 /PRNewswire/ -- On April 4, 2013, Columbia Banking System, Inc. (NASDAQ: COLB, " Columbia ") announced a correction to the results of elections made by West Coast Bancorp ("West Coast") shareholders regarding the form of merger consideration they will receive as a result of the April 1, 2013 acquisition of West Coast by Columbia. Initial results received from the exchange agent and reported on April 1, 2013 misstated the number of West Coast shares of common stock (on an as-converted basis) ("West Coast Shares") for which elections had not been made or were deemed not to have been made under the merger agreement ("No Election Shares") due to the exchange agent's inadvertent treatment of certain West Coast Shares held in "street name" as No Election Shares, even though elections for such shares had been made.