Pretty craptastic from what I hear...so probably about average for these types of SIC positions. It was around the whopping sum of $18K-ish last I spoke to my buddy. He seems to be getting pretty decent flying hours though, so it shouldn't take too long to upgrade to the left seat. When that happens, one can expect to make the desired livable wage of ($38K-40K) It could be a little different though. Check some postings made not to far in the distant past on this site. Should be able to get a better scope of what it is or isn't.
Also, keep in mind that if based in Hawaii, the currency is still in US Dollars so the income may not stretch as far as one would hope.