WASHINGTON & CHARLESTON, W.Va.--(BUSINESS WIRE)--United Bankshares, Inc. (NASDAQ: UBSI), today reported earnings for the second quarter and the first half of 2015. Earnings for the second quarter of 2015 were $34.8 million or $0.50 per diluted share, an increase from earnings of $33.2 million or $0.48 per diluted share for the second quarter of 2014. Earnings for the first half of 2015 were $69.4 million or $1.00 per diluted share, up from earnings of $63.4 million or $0.96 per diluted share fo