 ACNB Corp. has closed a 58 million acquisition of a Frederick bank, continuing its expansion across Maryland. The Gettysburg, Pennsylvania-based parent of ACNB Bank completed the 58 million acquisition of Frederick County Bancorp Inc., the parent of of Frederick County Bank, effective Jan. 11. Frederick County Bank will continue to operate as FCB Bank, a division of ACNB Bank. Frederick County Bancorp shareholders received 0.99 shares of ACNB common stock for every share of Frederick County Bancorp they owned. 