Mortgage regulators have sounded alarms and written new rules in response to the growing market share of nonbanks in the servicing market, but nonbank servicers were much more dominant 10 years ago. At the end of 2005, nonbanks accounted for 40.6 percent of mortgage servicing outstanding at the time. At the end of March 2015, nonbanks were making headlines because they had a combined 27.3 percent share of the market. …