It's massively unethical and it feels like people should be in jail, but proving actual crime took place during the lead-up to the recession would be a massive undertaking with little satisfaction as payout, and just as many run-of-the-mill home buyers going to jail as lender associates or executives.
No, you've committed the crime of solicitation at the moment you encouraged a particular person to commit a particular crime. And, if they agree and either of you takes any concrete step to implement the agreement (even short of completing the theft), you've both committed the crime of conspiracy.
If an expert tells you to break the law and insists it's fine, and you don't really know how all of this works, I don't think we can still call that merely "encouraging shady behavior".
I could be wrong here, so if you or anyone else with more legal background than I have can point to specific prosecutions related to this kind of situation I'd love to read more.
I'm not sure this is a hard case to make.
But is there explicit proof of this? I didn't think there was, but maybe I'm wrong. I thought at best the argument would be more like:
"Bank executives set up incentives for their employees that they knew would encourage fraudulent behaviour."