Credit Union in Knoxville, IA The Knoxville branch is C1st’s 17th branch location in Iowa and was established on December 2, 2016. The 2,500 sq ft branch includes a drive-up ATM, open floor plan and is home to an Interactive Teller Machine (C1st InTouch) - It looks like an ATM, the difference is you can have a real-time, face-to-face conversation with a C1st Teller, make cash withdrawals, deposit cash or checks, cash checks, make certain loan payments, transfer funds and more! Check out our personal banking pages for any questions related to checking, savings, loans and online banking.