ROMEOVILLE, Ill. (8/24/10--Members of Prairie Trails CU, Joliet, Ill., voted to merge with Argonne CU, Romeoville, Ill., effective Sept. 1. The combined credit union will be one of the largest in the state with more than $260 million in assets and more than 25,000 members. Headquarters for the new organization will be in Romeoville with no reduction in employees (Joliet Herald News Aug. 22). The combined credit union will have branches in six area cities and two area high schools, and limited-access branches for employees of two local companies. Brian Cedergren, Argonne CEO, will be the president/CEO of the combined credit union, and Matt Thraen, Prairie Trail CEO, will be the president of the Joliet Division, the paper said.