The characteristics of mortgages included in jumbo mortgage-backed securities remained strong in the second quarter of 2014, according to a new analysis by Inside Nonconforming Markets. However, the high quality of jumbo MBS has not attracted enough investors to make issuance more appealing for banks than retaining the loans in portfolio. Debt-to-income ratios on loans included in the $1.03 billion in jumbo MBS issued in the second quarter averaged ... [Includes one data chart]