Teachers Federal Credit Union has been open since 1952. It's the 2nd largest credit union in New York with assets totaling $7.37 Billion and providing banking services to more than 334,000 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.