Create a credit file for each player who receives a loan. Bankers will be able to issue a rating on 5 for each client and only the individual and other bankers when sent a loan offer will have access to said credit report.
UPDATE:
Forget my suggestion this is much better (From DezNuts)
- Details provides text history of request (for use in Credit Report Suggestion I'm still working out), to include offers made by other banks (just if they offered, not offer details), rejections by other banks, etc.