A woman robbed a Bronx bank a gunpoint Monday and made off with cash — but employees recognized her as a one-time customer and helped lead cops to her home, police said.

Deziree A. Diaz, 39, was allegedly armed with a pistol when she walked into the Amalgamated Bank on Tremont Avenue in Throgs Neck around 10 a.m. and demanded money from a teller, cops said. 

“She’s given an undetermined amount of money and a dye pack,” a police source said. “The employees of the bank remember her as a one-time client. They looked up her paperwork and called police.”

When police got to the bank, they obtained her address and went to her Dewey Avenue home less than a mile away. There, they found the money she had taken along with the dye pack.

Diaz was charged with robbery, criminal possession of a weapon and menacing, cops said. She’ll also face federal charges for the robbery, police said.