Colleen Manley, who started her career as a teller and rose to CEO of the largest credit union headquartered in north-central Washington, died unexpectedly Monday from natural causes.

Manley worked at CDFCU for 43 years, starting in 1979. She became president and CEO in 2008, and saw the credit union triple in size before last year’s merger with Spokane-based STCU.

After the merger, STCU retained...