Performance Evaluations

I'm new to the audit field and we have a new CEO in our credit union. I report to the CEO as well as the Supervisory Committee.  We are curious how other Credit Unions handle the annual performance appraisal of the Internal Auditor.Is the appraisal a mix of CEO (more of a day to day or operations supervisor) and Supervisory Committee (oversees audits and annual audit plan) or all CEO or...?  We're a little unsure of how to proceed and keep the independence of the auditor but be able to measure performance somehow.Thanks for the help!