 NEW YORK--BUSINESS WIRE--Halper Sadeh LLP, a global investor rights law firm, is investigating whether the sale of Bank of Commerce Holdings NASDAQ: BOCH to Columbia Banking System, Inc. is fair to Bank of Commerce shareholders. Under the terms of the merger agreement, Bank of Commerce shareholders will receive 0.40 Columbia shares for each Bank of Commerce share that they own, subject to certain potential adjustments. Halper Sadeh encourages Bank of Commerce shareholders to click here to l 