In 1932, during the Great Depression, ten teachers agreed to establish a credit union to serve educators. San Antonio Teacher ... s Credit Union (SATCU), the first state-chartered credit union in San Antonio, was born and proudly served members under that name for 70 years. In 2002, SATCU became Firstmark Credit Union when membership qualifications were expanded to help more people in our community. Although our name changed, we continue to be deeply rooted in the education community. Today, we are committed more than ever to the success of our educators and those who support them. We are proud to be a credit union founded by educators for educators! Firstmark Credit Union is a member-owned, locally controlled not-for-profit financial cooperative. Firstmark has over $1 Billion in assets and more than 97,000 members. Federally Insured by the NCUA. Equal Housing Lender. read more