Federal banking regulators have recently expressed some concern over the housing market as home prices in the United States have risen to record levels. While homes are more unaffordable than ever for many people, the lending market remains strong, mostly because of the introduction of new, ever-more-flexible types of loans. While these newer loan types, such as the interest-only loan, make buying a home easier for some borrowers, they also propose a greater risk to the lender. The lending ma.