Both sides of the mortgage banking business posted modest gains in profitability during the second quarter of 2013, according to a new analysis by Inside Mortgage Trends of earnings reports from nine lenders. The group reported a total of $4.34 billion in production-related income during the second quarter, up 2.8 percent from the first three months of the year. That’s a relatively strong showing given that their total origination volume increased by just 0.7 percent ... [Includes one data chart]