It happened around 3:50 Saturday at the branch inside the Acme Supermarket on the 4700 block of Limestone Road.
The suspect approached a 59-year-old female teller and presented a demand note. The note implied that the suspect was armed but a weapon was never displayed.
The teller gave over an undisclosed amount of cash and the suspect fled the scene.
No injuries were reported.
The suspect is described as a white female, 24-30 years of age, 5'2"-5'3" tall, weighing 120-140 pounds. She was last seen wearing a dark jacket, a black baseball cap, along with pink and purple paint on her face.
Anyone with information is asked to contact police or submit a tip via Delaware Crime Stoppers at 800-TIP-3333.