The wholesale-broker channel accounts for a relatively small amount of new business in the jumbo mortgage market, according to a new Inside Mortgage Trends analysis of lender surveys. Brokers accounted for just 4.6 percent of jumbo originations during the second quarter of 2017, although volume was up 13.7 percent from the first three months. The problem is that jumbo lending by a diverse sample of mortgage lenders was up 19.9 percent overall, meaning ... [Includes three data charts]