MUMBAI: Former managing director of Punjab Maharashtra Cooperative Bank, Joy Thomas, was arrested on Friday in connection with the alleged Rs 4,355 crore scam at the bank by the Economic Offences Wing of Mumbai Police.Thomas was summoned to the EOW office at the city police headquarters and arrested after questioning, a police official said.On Thursday, EOW had arrested HDIL directors Rakesh Wadhawan and his son Sarang Wadhawan in the case.