Police say the TD Bank at the intersection of Rt 202 and Beaver Valley Road was robbed by a man holding a gun at 10:54 a.m. on Friday.
The robber is described as a white man,5'10"-5'11" with a thin to medium build, wearing a black hooded sweatshirt, a black knit hat under the hood, black sweatpants, and white sneakers.
Police say the beard the man had on during the robbery was a fake.
The robber fled the bank with an undisclosed amount of cash.
Anyone with information should contact the Trooper John O'Donnell of the Pennsylvania State Police at (484) 840-1000.