The robbery happened around 10:25 a.m. Thursday at the Sovereign Bank located at 1917 MacDade Boulevard in Folsom.
Investigators say the man entered the bank, brandished a handgun, and demanded cash.
The subject fled the bank, and was last seen in a shiny black station wagon, possibly a Dodge Magnum.
The suspect is described as a very light-skinned black male, 6'0" tall with slender facial features, thin or lanky build, wearing a dark bandana on his head, aviator style sunglasses, and a light-colored buttoned shirt with epaulets on the shoulders.
The man was also carrying a dark backpack and had a white glove on his right hand in which he was holding the gun.
The robber was last seen in a shiny black station wagon, possibly a Dodge Magnum.
This subject is considered armed and dangerous, and anyone with information is asked to call the FBI at 215-418-4000.