You may want to investigate a large bank for entry-level security positions. In my experience, smaller banks generally have only one or 2 security personnel. I handle fraud, physical security (alarms, building access, etc), security training, Loss reporting, etc, etc). If you've got no fraud or bank security experience, looking for a bank with a security department and multiple employees may be the way to go so you gain all the experience necessary to be a Bank Security Officer. Just my 2 cents though. Good luck!