Mortgage banking firms managed to increase their employee rolls by 1,200 workers as autumn began, even though traditionally this is the time when lenders cut back. Hiring at mortgage brokerage shops remained relatively flat at 77,100, according to figures compiled by the Bureau of Labor Statistics. BLS found that mortgage banking companies had 218,300 full-timers on their payrolls at the end of August, a meager sequential gain of 0.5 percent. The figures, which are seasonally adjusted, do not distinguish between production and servicing workers.