Not sure how it works, but any and all info you give the banks seems to be fully accessible by any of the clerical staff.
Applying for a credit card limit increase one time, I gave them a list of all my assets etc etc. 2 years later a bank clerk, trying to upsell some product, starts to make reference to all this same stuff.
I would have thought some form of internal ethics based policy would stop your case or my case occurring.