Six weeks into the new year and it appears that merger-and-acquisition activity in the mortgage industry is finally picking up – big time. Over the past 10 days, several – mostly “asset” related – deals have come to light, with the action being driven by private-equity money that’s backing nonbank lenders. Wall Street giant The Blackstone Group, which has a PE division, is involved as well. So far, the only depository that appears to be playing in the M&A surge is...