Firstmark Credit Union (Formerly San Antonio Teachers Credit Union) is a member-owned, locally controlled not-for-profit financial cooperative. It was chartered in 1932, giving it the honor of being the oldest state-chartered credit union in San Antonio, Texas. It has repeatedly received a "Superior" rating from IDC Financial Publishing, Inc., one of the nation's leading analysts of financial institutions. This rank designates Firstmark Credit Union as one of the safest institutions in the United States.