The incident occurred around 10:15 a.m. at the Citizens Bank located in the unit block of East Woodland Avenue.
Police say the suspect entered the bank and demanded cash.
After receiving an undisclosed amount of cash he fled the bank on foot toward Powell Road.
There were no reports of any injuries.
The suspect is described as a black male, 5'10" tall with a mustache and wearing glasses, a grey sweatshirt, jeans and a black knit cap.
Any person with information on the identity of the suspect is asked to contact the police or call Detective Bridget McCarthy at 610-544-5505 or 610-544-1100 ext. 315.