Originations of non-agency jumbo mortgages continued to increase in the second quarter of 2013, according to a new ranking and analysis by Inside Nonconforming Markets. The growth was fueled by banks offering highly competitive interest rates in an effort to retain jumbos in portfolio. Wells Fargo was the top-ranked jumbo lender through two quarters in 2013, by a wide margin. The lender had $21.87 billion in jumbo originations in the first half of 2013, accounting for 19.4 percent of ... [Includes one data chart]