Police describe the suspect as a white or Hispanic man, 6ft. 180lbs., wearing a black cap and a dark green jacket over a grey hooded sweatshirt with jeans.
He was last seen heading west on 34th Street then north on Plum Street on foot.
Police say the suspect demanded money but did not have a weapon or use a note.
That same bank was held up on February 25, 2014 by two people that still haven't been arrested.
Anyone with information on the man involved in the latest robbery is asked to call police at 870-1120 or 870-1159.