To be honest, I don't know how their earnings will fare against analyst estimates. Trying to guess that is mere gambling if you ask me.
However, WBS fundamentals are very strong. Their credit quality is good. Regional banks in general have outperformed the behemoths in the last year because of their much higher quality capital structure aka significantly less exposure to toxic subprime mortgages and European sovereign debt.
Therefore, I'm holding my position into earnings, which is something I rarely do. I tend to downsize before earnings release dates on my stocks because of the unpredictability that usually comes with the horde of day traders that descend on Earnings Day. In this case, however, I see very little downside risk. WBS management operates very conservatively, which practically ensures any surprise will be a good one.