DIRIGO Federal Credit Union (formerly known as Rainbow Federal Credit Union) has been open since 1956. It's the 9th largest credit union in Maine with assets totaling $254.47 Million and providing banking services to more than 22,000 members. Membership: The credit union is a community-based financial institution. People living, working, or worshipping in the credit union's geographic area can become a member and access banking services. Membership is also open to immediate family of current members.