What is the phone number for idaho central credit union? The contact number of Idaho Central Credit Union is 208-478-3300.What is the address for the associated credit union? The address of Associated Credit Union is 6251, Crooked Creek Road, Norcross, Georgia 30092-3107, United States.What is idaho credit union league? The Idaho Credit Union League is the trade association representing over 30 credit unions across the state.What is idaho credit union? The Idaho Credit Union Difference. Credit unions are not-for-profit, cooperative financial service providers – owned and governed by their members. That unique structure intentionally holds credit unions accountable to their members, and every decision made is in their best interests.