A broad sample of 25 publicly traded banks reported strong earnings from their mortgage-banking operations during the second quarter of 2015, a new Inside Mortgage Trends analysis reveals. The group, which includes the four megabanks and the major regionals involved in the sector, reported a combined $4.391 billion in mortgage-banking income for the second quarter. That was up 19.6 percent from the first quarter of this year, and it ... [Includes one data chart]