https://www.jewishvirtuallibrary.org/banking-and-bankersOr you can search for literally any source. The extreme success of the Jewish communities throughout time is extremely well documented. This success, paired with insularity, was often one of the big motivations for their oppression throughout history. Expulsions would generally involve direct or indirect confiscation of material possessions. Between the 13th and 16th century Jews were expelled some 15+ times, in some cases multiple times from the same places (such as France) where they would be expelled, invited as their absence proved problematic, expelled again, and so on.
The reason Jews have distinctive features is because today about 75% of Jews are Ashkenazi - a very distinctive group with a variety of distinct features, both physical and nonphysical. For instance Ahskenazi individuals show an average IQ average nearly a standard deviation above the mean. The reason for the genetic relationship is that historically Judaism was far more insular than it is even today. For instance interfaith marriages is an extremely new phenomena. Pair a religion that makes it extremely difficult to join (and was only more difficult in the past) with extreme restrictions on things like marriage, and you end up with strong genetic similarity. It's not dissimilar, in effect, from geographic isolation which yielded most distinctive traits of various groups today.