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It happened in Perry Street at 9.30 this morning.
A man went into the bank, demanded money and left. Police believe he fled in a waiting car.
The car is a red Skoda Octavia estate which was parked in Alfred Place and police are asking the public to report any sighting of it or any details about the driver.
An amount of cash was found nearby and forensic teams using it as evidence.
The offender is described as a white male, 6ft, wearing a dark Parka-style coat with the hood up, a black scarf, black tracksuit bottoms and black trainers.
If anyone has information about the car or the offenders, call Police in North Kent on 01474 366091 or Kent Crimestoppers, anonymously, on 0800 555111.