Banks and financial institutes screening

Hi Serenity,

I realized that Grahams's criteria can not be used to find (undervalued) banks, because of the missing values within the balance sheet for e.g. calculating the current ratio or sales etc.
Do you have any idea how to bypass this problem?
The advanced screener is able to ignore those criteria, but what to apply instead?
In short: How to screen undervalued banks and financial institutes?

Regards,
MrSmith