NEW YORK (CNN/Money) - The banking industry is opening its doors to a controversial new market: illegal immigrants. Despite heated political debate in Washington over illegal immigration in the United States, an increasing number of banks are seeing an untapped resource for growing their own revenue stream and contend that providing undocumented residents with mortgages will help revitalize local communities. It's a win-win situation, they say. But skeptics worry about the message these home loans send to illegal immigrants: break our laws and we'll reward you with a home. "It's institutionalizing illegality," said Marti Dinerstein, president of Immigration Matters, a...