After declining for two consecutive quarters, the delinquency rate on jumbo mortgages increased in the third quarter of 2017, according to Black Knight. Hurricanes contributed to the uptick in delinquencies, and performance in the jumbo market remains strong overall. The delinquency rate on non-agency jumbo mortgages was 1.60 percent as of the end of September, according to Black Knight. That was up from 1.49 percent in the previous quarter ... [Includes one data chart]