The FBI alleges Arnold walked into an Alaska USA Federal Credit Union branch Friday and inquired about the balance on his account. The teller asked for his name, account number and ID.
Authorities say he complied, and then handed over a receipt with a note on the back that said he had a gun and demanded money.
The FBI says he got away with about $600. Authorities arrested Arnold on Monday. A message left after business hours Wednesday with Arnold's public defender, Michael Dieni, was not immediately returned.
Court records say Arnold was sentenced to 57 months in prison for bank robbery in 2004.
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