Western Alliance Bancorporation (NYSE:WAL) reported its first-quarter financial results after the bell Thursday. Here's a look at the details.  The Details: Western Alliance reported quarterly earnings of $1.60 per share, missing the consensus estimate of $1.66 by 3.61% and representing a 30.43% decrease from the same period last year. The company reported quarterly sales of $728.8 million which beat the analyst consensus estimate of $697.04 million by 4.56% and ...