I agree with Randy, too. Unless your credit committee is pulling the criminal record of every applicant, they are digging a hole here.
How did they know of the conviction?
I bet if you scoured your files and compared them to court records, you'll find convictions for DUI, assault and theft for more customers. One in 100 Americans is in jail or has served time. If this is the first time you've denied a loan for this reason, you may want to reconsider the precedent.
_________________________
Just another self-proclaimed expert ...