NGM Employees Federal Credit Union has been open since 1966. It's the 13th largest credit union in New Hampshire with assets totaling $5.26 Million and providing banking services to more than 1,000 members. Membership: The credit union is a member-owned financial cooperative providing financial banking services to multiple member groups, but primarily serves finance, insurance, real estate, and trade industry employees. Membership is also open to immediate family of current members.