TheStreet's Jim Cramer likes the banking sector because it is well behind the market. J.P. Morgan and Goldman Sachs had very low expectations. Cramer says they both reported pretty good numbers and because the expectations were so low, pretty good numbers were enough to send the stocks higher. Cramer thinks both stocks are very cheap. To contrast, expectations for Wells Fargo were really high and they released really good results. Cramer says that when expectations are really high, investors are going to see a sell-off. Cramer says that he is a fan of all three stocks because of the lag between the banking sector and the market.