The man entered TD Bank in Farmingdale, located at 90 Broadhollow Road, at around noontime Wednesday, Nov. 23, and handed a teller a note demanding cash, Suffolk County Police said.
The teller complied and the robber fled on foot, according to police.
The man is described as light-skinned Hispanic, approximately 5-foot-10 with a thin build, police said.
He wore sunglasses, a dark-colored hooded sweatshirt with "Wild Cats" written across the chest, and gray sweatpants, said police.
Detectives ask anyone with information to call the Major Case Unit at 631-852-6553 or Crime Stoppers at 1-800-220-TIPS. All calls will be kept confidential.
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