You will need your HSA number in order to enroll in Online Banking. About a week after you open your HSA, you will receive a welcome letter with your account number and instructions for accessing the Old National Bank online banking site and telephone banking system. To avoid a paper statement fee, be sure to follow the instructions in the welcome letter to elect eStatements. If you would like assistance using these services, please call our Client Care Center toll-free at 888-472-8697