What are the ramifications of forgery, identity theft, false impersonation or theft by deception?

I have proof that my estranged wife has forged my name on a student loan. I am getting bills now saying I'm responsible because she isn't paying. In 2008 without my permission she signed my name to a student loan (through Wells Fargo Bank). I've contacted the bank, compared the signatures and have filed a police report. I have to go to a notary today and sign in front of them. We were married at the time but I did NOT give her permission to use my name and had no idea she was doing this behind my back. We were having problems back then and I would have never agreed to another co-debt. I am worried that I am responsible for this loan and it is now effecting my credit because she is not making the payments. I plan on moving forward with the charges but would like to know the ramifications ahead due to the fact that we have two teenage boys that I will need to prepare. From what I'm reading there could be jail time, probation, etc... The amt of the loan was over $14K.