Essential Federal Credit Union (formerly known as Dow Louisiana Federal Credit Union) has been open since 1972. It's the 10th largest credit union in Louisiana with assets totaling $333.08 Million and providing banking services to more than 38,000 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.