He fled the bank on foot with an undisclosed amount of cash, and no vehicle was seen.
The man is described as a black male, age 30 to 40, 5 feet 10 inches to 6 feet tall, weighing 160 to 175 pounds, according to police.
He was wearing a light colored long-sleeve shirt, blue or gray pants and sunglasses and spoke with what police described as a Jamaican accent.
No one was injured.
Anyone with information is asked to contact the Pleasanton Police Department at 931-5100.
This story contains 134 words.
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