Refinance activity has represented more than half of home loan originations every year since 2006, and housing sales have been in a slump for the past five years. But individual mortgage lenders continue to carve out their own production strategies, including in some cases a devotion to the smaller purchase-mortgage sector. A new Inside Mortgage Finance analysis of loans originated under the four major agency mortgage programs through the first nine months of 2011 shows that many of the top overall producers beefed up their market share by aggressively originating...(Includes one data chart)