The heist happened around noon Tuesday, the Tampa Bay Times reported.
Police said. Marcus Ryan Halbert, 22, entered the bank and pointed a knife at his friend, Alan Michael Ethington, 21.
Halbert then made off with $103,000.
Police quickly caught Halbert, who then allegedly told them he and Ethington had planned the robbery.
Halbert and Ethington were both arrested Tuesday and charged with grand theft and defrauding a financial institution.
Both suspects remained in jail Wednesday in lieu of $5,000 bail each.