But police say the woman robbed the bank, and the man was her unsuspecting getaway driver.
The man told The Free Press of Mankato that he thought the woman, who rents an apartment from his mother, was going to the bank to withdraw cash to pay her rent.
Instead, employees of the Elysian State Bank reported Wednesday that an "elderly woman" told the teller she had a gun, demanded money and left with an undisclosed amount.
Police stopped the car and took both into custody before determining the woman acted alone.
The Star Tribune reported the woman had a hammer but no gun. She's in jail, pending charges.