CHARLES TOWN, W.Va., Feb. 12, 2018 /PRNewswire/ — Potomac Bancshares, Inc. (OTC-QB: PTBS), the one bank holding company for Bank of Charles Town (BCT), for the quarter ended December 31, 2017 earned $422 thousand or $0.13 per share compared to $587 thousand or $0.18 per share for the…