I was thinking the implementation of a Risk Manager type position to oversee - audit and compliance.
With an RM to oversee both areas, you'd still want to have two areas. rlcarey said it the best above. Don't do your self the disservice of having to separate them later. This includes having to separate compliance from the loan officer that ran the slowest or someone else at your bank that mgmt. doesn't see as having a full slate. Does mgmt. not see compliance as a full-time job? I've seen that before, too.
If that's the issue, consider how much time the compliance officer will be spending on compliance and what he/she could do with the other hours in the week. But adding it to the auditor's list will cost you more time in trying to keep the areas independent.
Having a FT internal auditor at your size is impressive and shows a commitment from your BOD. Maybe you need to convince them of the value of a FT CO. After all, aren't you already FT in the audit world? Do you really have time to run compliance management in addition to your current duties? (I'm assuming you will have no new hire.)
My new posting at work.... "Compliance is an arm of mgmt.; Audit is an arm of the BOD." Love that.