Commercial banks and savings institutions are continuing their years-long flight from the volatile business of holding mortgage-servicing rights on their balance sheets, according to a new Inside Mortgage Trends analysis of call report data. At the end of June, banks and thrifts serviced $3.916 trillion of single-family mortgages for other investors, usually mortgage-backed securities trusts. That was down 2.1 percent from the previous quarter and ... [Includes one data chart]