Columbia Banking System (COLB) in Tacoma, Wash., is looking for a new chief operating officer.

The $4.9 billion-asset company disclosed in a regulatory filing Monday that Mark Nelson, who is also an executive vice president, will retire on Sept. 30. He is also the chief operating officer for Columbia State Bank.

"During his 11 years with the company, Mark has been a significant contributor to our growth and success," Melanie Dressel, the company's president and chief executive, said in the filing. "He has developed a very strong leadership group to carry on his areas of responsibility."

Nelson, 62, will serve as a consultant during a transition period. Columbia said in the filing that it has already started looking for a successor.

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