A man from Bangor accused of holding up a credit union in downtown Bangor pleaded not guilty Thursday – but could change that plea later this month. 20-year-old Donovan Steen is charged with robbing the Penobscot County Federal Credit Union in January. He’s also accused of stealing more than $4,000 worth of jewelry and other items from his mother. Steen also pleaded not guilty to that. Assistant District Attorney Greg Campbell says Steen’s lawyer wants time to review evidence in the robbery case before Steen possibly changes his plea.Steen is due back in court in a couple of weeks.