MCUA veteran had been serving as interim leader since Mike Beall's departure in November.
McDonald has been president/CEO of the $897 million, 98,700-member Andrews FCU in Suitland, Md., for the past four years.
Corwin leaving Meritrust in Kansas for new post in home state of Oregon.
Parkside Credit Union of Livonia, Mich., announced that Martin Carter will join the credit union as president and chief executive officer. Carter brings more than 30 years of credit union industry experience to this position.
Thirty-three-year credit union veteran had been president of CapCom Credit Union before its 2009 merger with DFCU Financial.
Carter assumes position after more than 30 years in credit union industry.
The board of directors of Georgia Heritage Federal Credit Union recently named Dale Taratuta as president/CEO.