While the characteristics of loans included in jumbo mortgage-backed securities continue to be strong overall, industry analysts note that there are significant differences in “soft” underwriting guidelines used by lenders. “Not all underwriting guidelines, and exceptions to guidelines, are created equal,” analysts at Morningstar Credit Ratings cautioned in a recent report. “Some originators recently have introduced programs that make qualifying for financing easier and require less income documentation.” The company, which is making a new push to rate jumbo MBS, reviewed the guidelines of a number of the most active jumbo originators and aggregators ...