An Anchorage bank robber whose identity was revealed when he showed his own photo ID card to a teller during the heist has been sentenced to 12 years in prison, according to the U.S. attorney. Jarell Paul Arnold, 34, pleaded guilty in October to one count of credit union robbery. According to prosecutors, Arnold entered the Alaska USA Federal Credit Union on Juneau Street last August and gave the teller his real name and account number as he inquired about his balance.