Established in 1934 as Tulsa Teachers Credit Union, TTCU The Credit Union is the largest state-chartered credit union in Oklahoma. We're a $2.56 billion financial institution with a full complement of depository, lending and financial advisory services. As a not-for-profit organization, our financial success is returned to our membership in the form of low-rate loans and high-rate savings accounts. The membership of TTCU is over 140,000 strong and is made up of teachers, school faculty, administrators, staff, students and more than 600 affiliated groups. TTCU is a proud member of the Credit Union National Association and the Cornerstone Credit Union League.