The average mortgage banking firm reported a hefty $4.12 million net profit during the third quarter of 2012, up 40.4 percent from already high earnings in the previous quarter, according to the Mortgage Bankers Association’s performance report. Although the MBA survey group – 311 companies in the latest report – varies somewhat from period to period, the third quarter earnings represent a windfall in profits that mirrors the results reported by large public companies and financial institutions ...