If you go on Fanniemae's site - they have instructions for completing the 1003. (http://www.efanniemae.com/sf/formsdocs/forms/1003.jsp?) There is a section titled "To Be Completed By Interviewer" as shown below.
"To Be Completed By Interviewer
The interviewer must complete this portion of the form to indicate the method used to take the application and to provide the name and telephone number of the interviewer, as well as his or her employer's name and address."
Do you by chance have a centralized location's address you could insert for the banks name?
A few years back during an audit, we were cited for not having this section completed or a signature of the LO on the final 1003. We've made it a practice to have this section completed for every 1003.