The men were originally captured on surveillance video.
Monday evening Provo police arrested 19-year-old Braydon Madsen, 21-year-old Luis Vera and 19-year-old Nicholas Vera.
Officers believe the men wore matching suits, ties and false beards when they robbed AM Bank branches in Provo and Lindon.
All three were booked on aggravated robbery charges.
Provo detectives arrested a fourth suspect Tuesday night. Police believe Waldo Ariel Fernandez, 42, was the get-away-driver in the robbery.