The Arbuckle Federal Credit Union All Credit Levels is a cdfi lender from Arbuckle Federal Credit Union. The ongoing APR is 5.50% APR*. Rewards: Profits are returned to members through better rates, lower fees, and free services.. This product reports activity to your personal credit report. Arbuckle Federal Credit Union is a member-focused financial institution located in Ada, OK, offering a range of banking services designed to benefit its members. The credit union serves the local community by providing competitive rates and lower fees on various loan products. Services include: personal loans, auto loans. US Treasury certified CDFI Credit Union in Ada, OK. Membership required.