Non-agency jumbo mortgage originations accounted for a historically high 19.4 percent of new lending during the first half of 2014, and the sector is steadily gaining ground, according to a new Inside Mortgage Finance analysis of big-ticket mortgage activity. During the second quarter of 2014, lenders originated an estimated $59.0 billion of mortgage loans that were too big to be financed through Fannie Mae, Freddie Mac or the FHA. That was up 34.1 percent from the first quarter, a noticeably bigger increase than the 25.5 percent jump in total mortgage originations for the period. Compared to last year, jumbo lending was...[Includes three data charts]