It happened at 7:28 p.m. March 13th at the Trumark Financial Credit Union in the 7300 block of Castor Avenue.
Surveillance video shows the man walking into the building, handing a teller a demand note, then leaving with an undetermined amount of cash.
He was last seen fleeing north on Castor Avenue toward Bleigh Avenue.
Detectives are looking for a black or Hispanic man with a light complexion and goatee beard, 5'11" - 6'0" tall with a stocky build. He was wearing a green and black coat and a green and tan hat.
If you have any information about this crime or this suspect, you are asked to contact Detective Cawley at the Philadelphia Police Northeast Detective Division, 215-686-3153/3154.