It would be a name for a new startup lending company, existing companies already branded would see little value, unless they are using a long tail of your current domain. A quick google search brings up some operators, but most of these guys are independent mortgage lenders, and selling them domains is very similar to selling them to the real estate industry. Most likely you are going to have to wait for the right buyer to contact you. The singular has a live TM so be careful, sending them emails. Regardless it is a great brand name, and brings instant credibility to anyone using it.