Profit margins and net income fell sharply in the mortgage banking business during early 2017, according to new data from the Mortgage Bankers Association. On average, firms participating in the MBA’s quarterly performance report earned just $886,000 in pretax income during the first quarter, a hefty 74.8 percent drop from the previous period. Only about two firms in three (67.0 percent) managed to report net pretax income for the first three months of the year. The industry funded...