The use of conventional conforming mortgages in the home purchase market, which fell to the lowest level in more than a decade last year, is staging a comeback in 2012. A combination of events – particularly increased home buying by higher-income current homeowners and more attractive pricing for higher loan-to-value ratio conventional financing – appears to be fueling the growth. Perhaps the most visible sign of the growth in the conventional side of the home purchase market can be found in Fannie Mae’s and Freddie Mac’s latest mortgage activity numbers. According to data compiled by Inside Mortgage Finance, the combined home purchase mortgage business of Fannie and Freddie climbed to $77.6 billion in the third quarter of this year. That was not only up 33.6 percent from the second quarter’s volume, but put...