Can anyone point me to good resources specifically tailored for the banking industry on what documents cannot (or should not) be signed electronically? Obviously anything requiring notarization is out. I'm looking to develop a comprehensive list for my bank.

Electronic signatures are more of a State law issue.

This is an interesting question. If you find a resource like this, please let us know.

Digital signatures are relatively new and neither the state UETAs nor ESIGN specify what is or is not a valid digital signature. Most likely, you've already researched case law and found little or nothing on point. It's going to be up to each litigant to convince each court that a particular series of electronic events should carry the same weight at a wet signature. The customer can be expected to disavow the "signature" and urge the court to throw out the bank's claims.

Assuming you are unable to find the hoped-for resource, your bank will need to apply good old fashioned risk management techniques. Document by document, quantify how much you will lose if:
a. you accept an electronic signature instead of a wet one.
b. the customer defaults or is otherwise in breach of the terms of the electronic promises.
c. you go to court to obtain a judgement and the court rules against you.

Some of those failed signatures won't make much difference. Either it's unlikely you will need to go to court, or the amount at risk is small. Put these documents on the "OK" list. The others could cause significant harm to the bank and you should put these documents on the "too risky" list...at least for now. We can hope for case law on digital signatures, but no bank wants to be the poster child for a digital disaster.