Mortgage lenders have been chasing purchase-mortgage business since the refinance market started to subside early in 2013, but the refi sector showed considerable strength during the third quarter of this year, according to a new Inside Mortgage Finance ranking and analysis. Refinance originations increased by 21.4 percent from the second quarter to the third, with an estimated $136 billion in production volume. At the same time, purchase-mortgage originations rose by just 5.6 percent, to an estimated $209 billion. Refi lending is...[Includes five data charts]