The offender walked into the bank at around 3.30pm and left on foot, turning left towards Alcester.
A number of police enquiries are ongoing to trace him.
He is described as a white male, wearing a light grey jacket with a logo on the front left side and a dark vertical stripe on the right side.
He was also wearing dark trousers and was carrying a white carrier bag.
Anyone with information or who recognises this man should not approach him but call Warwickshire Police CID on 101, quoting incident 213 of 13th October, or Crimestoppers anonymously on 0800 555.