Zamer Williams, 18, of Camden County, New Jersey, was charged earlier this week.
He is accused of two armed robberies and an attempted robbery last Friday.
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Group of suspects target customers outside three Delaware banks
The crimes all took place in bank parking lots within a 90-minute span.
Police are still searching for several more suspects.
Police say Williams was arrested in New Jersey on November 14. Upon extradition to Delaware, he will be facing a slew of charges, including robbery and possession of a firearm.
Anyone with information on this case is asked to call state police at 302-365-8471.
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Stolen vehicle connected to suspects robbing bank customers in Delaware recovered in Philadelphia