Authorities said he gave a teller a note demanding money and threatened that he had a weapon. After getting the money, he left in an unknown direction.
No one saw a getaway car. He was last seen running northwest across La Promesa into an apartment or condo complex.
The suspect was described as a white man in his 30s, between 5 foot 9 inches to 5 foot 10 inches tall and about 170 pounds.
Anyone with information is urged to call the Orange County Sheriff's Department at (866) TIP-OCSD.