Several tellers were working at the time, and one customer was present, police said.
Afterward, the robber drove off in either a late 1990s Mercury Mountaineer or Ford Explorer sport utility vehicle, heading east toward Charles Town on W.Va. 9, police said. The bank is in the parking lot in front of Kmart and the old Lowe's building on Apple Harvest Drive.
Along with deputies, FBI agents were investigating the case, which is standard procedure for a bank robbery, said Chief Deputy Kenneth Lemaster, with the sheriff's department.
Witnesses described the robber as a white man with brown eyes, who was 5 feet, 6 inches to 5 feet, 8 inches tall with a heavy build and large chest, police said. He wore a faded jean jacket and faded jeans.
The SUV's license plate is believed to be a West Virginia tag, possibly with the first digit of 7, Lemaster said.
Several hours after the robbery, numerous cars were parked outside of the recently built bank, but all blinds were shut on the drive-through windows. A handwritten sign on the front door told customers that the office was closed, and that they could use the Hedgesville, W.Va., branch.
Anyone with information can call the sheriff's department at 304-267-7000 or the anonymous Crime Solvers line at 304-267-4999.