Columbia Bank President and CEO Melanie Dressel died suddenly late Sunday at her home on Key Peninsula. She was 64. "It is with great sadness that I announce the passing of my friend and colleague Melanie Dressel,” Columbia Bank Board Chairman William Weyerhaeuser said in a statement. “Under her tireless leadership, Columbia grew to be widely recognized as one of the best regional community banks in the country, and has been continually acknowledged as one of the best workplaces in the Northwest.” The…