May be the lack of any really bad news. I agree the results weren't all that great, but there were some positives. Not the least of which was the CEO standing up declaring that the worst was behind them. It may take some time to work through whatever problems they still have, but the lack of bad/catastrophic news is a good thing.
Add to that the fact that the whole market is absolutely corrupt and crooked and you can justify why Wells Fargo met expectations and tanked while BAC missed expectations and went up. It's all about manipulation.
All in all don't worry about today, nothing much moved. A year from now it will be radically higher as things continue to improve, so don't sweat it.