Banks reported a drop in mortgage-banking income during the second quarter of 2016, according to a new Inside Mortgage Trends analysis of earnings reports from 26 major public companies. But virtually all of the decline came from the four too-big-to-fail banks with over $1 trillion in assets, while regionals posted a substantial increase in mortgage-banking profits. As a group, the 26 banks earned $3.12 billion from mortgage banking during ... [Includes one data chart]