It's an American stereotype that Jewish people are smart and rich. Often, these stereotypes appear in negative contexts, but I've seen this tv show and they're trying to be tongue-and-cheek/funny. It's to say, his parents like her because, as a lawyer, she must be smart and rich (like Jewish people). While stereotypes like these are old and unfunny, you'll certainly find them in lots of American TV.

This is referring to the stereotype that Jewish people are highly successful in their careers, usually working as lawyers, doctors, engineers, or business leaders where they earn $100,000+ USD per year.