It happened just before noon at the Beneficial Bank at 826 Allegheny Avenue.
That's when, police say, the man walked in and gave a demand note to a teller. After receving the cash, the man fled on foot.
He is described as a Hispanic man in his mid-30s, around 5'8" tall with a medium build and a mustache. He was wearing a dark baseball cap with a "P" on the front, a light blue t-shirt and a dark blue jacket.
This man is considered armed and dangerous.
Anyone with information is asked to call the FBI at 215-418-4000 or the Philadelphia Police Department.
You can get the latest crime statistics from the Philadelphia Police by CLICKING HERE for the force's crime data mapping site.