The Bangor School Department’s former top finance official was arrested by Brewer police late Thursday night and charged with two counts of possession of sexually explicit material. Alan Kochis, 62, resigned earlier this month from the Bangor School Department after Maine State Police seized electronics from his home. He had allegedly uploaded a sexually explicit image of two boys to the internet. Kochis, of Brewer, was the school department’s longtime business services director, involved in preparing the school department’s annual budget and overseeing its accounting system.