The St. Tammany Federal Credit Union All Credit Levels is a cdfi lender from St. Tammany Federal Credit Union. This product reports activity to your personal credit report. St. Tammany Federal Credit Union is a member-owned financial institution located in Slidell, LA, providing a range of financial services to its members. It serves the local community by offering various lending options and financial products tailored to meet the needs of individuals and families in the area. US Treasury certified CDFI Credit Union in Slidell, LA. Membership required.