"CRE portfolios have seen rapid growth, particularly among small banks. At the end of 2015, 406 banks had CRE portfolios that had grown more than 50 percent in the prior three years. Of note, more than 180 of these banks more than doubled their CRE portfolios during the past three years. At the same time we are seeing this high growth, our exams found looser underwriting standards with less-restrictive covenants, extended maturities, longer interest-only periods, limited guarantor requirements, and deficient-stress testing practices."