The average mortgage banking business earned a tidy $2.94 million in after-tax income during the second quarter of 2012, up 44.9 percent from the first three months of the year, according to the Mortgage Bankers Association’s latest performance report. Midway through the year, average after-tax income was $4.97 million for the 300-odd companies that participate in the MBA survey. That was up more than five-fold from the first half of last year. The stronger earnings resulted from increased profitability ...