Strong competition among big banks helped increase originations of jumbo mortgages during the second quarter, according to a new ranking and analysis by Inside Nonconforming Markets. An estimated $101.0 billion in jumbos were originated in the second quarter, up 31.2 percent from the previous quarter. Through the first half of 2016, an estimated $178.0 billion in jumbos were originated, a 7.9 percent increase from the first half of 2015. Jumbo mortgages ... [Includes one data chart]