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One of the Pacific Northwest’s largest regional banks is gaining a foothold in the Arizona market with new branches in Phoenix and Scottsdale and a third to open in Mesa by the end of the year. Oregon-based Umpqua Bank, a subsidiary of Columbia Banking System Inc. (Nasdaq: COLB), on Monday opened a 4,000-square-foot Scottsdale branch office in Gainey Center II, 8501 N. Scottsdale Road.