IIRC, double jeopardy doesn't stop both criminal and civil charges from being filed for the same offense (it only applies to being criminally charged multiple times)?
Given that their return might be limited to their provable losses & that they'd have to demonstrate those in court I suspect that they'll probably decide it's not worth the effort. The guy has already spent a year in prison after all & they've successfully demonstrated to all their other employees that GS will go for the maximum possible sentence if any of them transgress in the future, which was probably the main point of the whole exercise in the first place.
In other words, a person can be charged in federal and states courts separately for the exact same acts.