Bank investors typically use the price-to-book ratio to value banks. But this can sometimes be a mistake. Many banks are either now, or soon will be, trading beyond the benchmark of one times book value that investors prefer. This shouldn't stop you from investing in banks, however, because it fails to adequately capture return. As Fool contributor John Maxfield discusses in the following video, going forward, the best returns from bank stocks will likely come in the form of dividends. Consequently, the thing to watch for is both current yield and its potential for growth.