The man entered the Whidbey Island Bank at Frontier Village along Highway 9 just after 3:15 p.m., according to Lake Stevens police.
He indicated he had a weapon and demanded cash. He ran away with the money. No injuries were reported.
The man wore sunglasses, a black hoodie-style sweatshirt, blue jeans and brown shoes.
He was described as white, about 5-foot-6 and in his 40s. Witnesses said he had a large nose and a medium build.
A police dog search was unsuccessful.
Anyone with information should call 911 or 425-334-9537.
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