Originations of jumbo mortgages declined across channels in the first quarter with the retail channel gaining market share, according to survey results analyzed by Inside Nonconforming Markets. Jumbo originations reported by survey respondents declined by 30.4 percent from the fourth quarter of 2017 to the first quarter of this year. The survey data, gathered by Inside Mortgage Finance, included $40.4 billion of first-quarter jumbo originations, roughly two thirds ... [Includes one data chart]