First of all, I would like to encourage you to go back, search on this site on the subject of unemployment overpayments fraud, etc. A lot of what we say is repeating ourselves over and over and over. People keep making the same mistake over and over, figuring for some really dumb reason that they can work and draw unemployment benefits and no one will notice. The number who try this over a year is in the high thousands in every state. Which is why the sheer volume of dumb and dishonest people would totally fill up our jails and court system if they prosecuted everyone who was dumb and dishonest in this particular way.
Secondly, I'd like to ask you why you suddenly grew a conscience, got worried about this, decided that perhaps it wasn't such a good thing to do? Did you get contacted by the fraud unit yet? it is totally inevitable that this WILL happen, And if it hasn't happened to you personally yet, I'd strongly suggest that you begin by, as was mentioned, if you are still doing it, STOP. And then, I would, from my extensive experience in unemployment fraud, suggest that you contact them, confess (skip all the stupid excuses, they've heard them ALL before. You were fully informed and fully had it explained to you what this was and what would constitute fraud, and you committed it ) and begin working with them to get an overpayment decision and unquestionably to set up a repayment plan with significant fraud penalties.
As it has also been pointed out, they are much more interested in getting their money back than in prosecuting people criminally. First you'd be working with the agency, they try to get you set up to repay the money, and deal with it. If you lawyer up, shut up, fail to cooperate, ignore them, make it in any way more difficult for them to collect this overpayment, you might be the lucky one in every so many who turns out to get recommended for prosecution. your best bet is to plead totally stupid, in that I made a mistake (they can see exactly how much you drew, how much you worked, etc. They get the records from every employer and cross match everything) and that I would like to do everything in my power to set it right. This is NOT, at this point, a criminal matter. It is not the time to admit nothing, lawyer up, or even to sit and wait to get caught. But what you did looks very deliberate, very stupid, very much like the intention to commit fraud. Work on it.