It happened at the branch at 6420 Frankford Avenue around 10:25 a.m. on Friday, May 29th.
Investigators say the man entered the bank with a gun, struck a customer in the head with the weapon, and jumped over the teller counter.
The suspect then stuffed cash into a green camouflage pillowcase, then fled on foot onto Hellerman Street.
The suspect is considered armed and dangerous, and anyone with information is asked to call the FBI at 215-418-4000 or the Philadelphia Police Department.
There may be a reward for information leading to the robber's arrest.
Tipsters can remain anonymous.
You can get the latest crime statistics from the Philadelphia Police by CLICKING HERE for the force's crime data mapping site.
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