FIRST BANK <FBS> AGREES TO SELL ANOTHER BANK First Bank System Inc said it has found a potential buyer for First Bank Luverne and its office in Pipestone, Minnesota. The bank holding company said 215 Holding Co, a corporation controlled by the family of the late Robert Short, will buy First Bank Luverne. The bank has 59.2 mln dlrs in assets. First Bank, which announced plans in 1985 to restructure its banking assets by offering to sell 28 of its banks with a total of 45 offices, said agreements have now been signed for 43 of these offices.