Apparently your husband was sued and a judgment was awarded.. that's the only way, outside of student loans, that anyone can levy a bank account.
If the lawsuit was only against your husband, then no, they cannot come after any money in an account with ONLY your name on it.
If you are unaware of a lawsuit, I suggest you call the courthouse ASAP and find out, get a copy of the case file. Unless they got ALL the money they were owed, they will come back for more !!!