The fire was reported shortly before 11 p.m. at the bank located in the 7400 block of Lancaster Pike.
Firefighters arrived to find flames shooting from the roof of the building.
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A second alarm was called a short time later.
The state fire marshal's office determined that the fire was caused by a malfunction in the HVAC unit.
There was about $500,000 in damage to the bank and the Arthur Hall Insurance Company.
No injuries were reported.
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