Code of Hammurabi

So it looks like the difference between punishing bankers and less sophisticated criminals is pretty old:

1) Ex. Law #265: "If a herdsman, to whose care cattle or sheep have been entrusted, be guilty of fraud and make false returns of the natural increase, or sell them for money, then shall he be convicted and pay the owner ten times the loss."

2) Ex. Law #22: "If any one is committing a robbery and is caught, then he shall be put to death."