The colloquial definition of usury is to charge exhorbitant rates of interest on money borrowed, but the archaic definition is to charge ANY amount of interest on a loan (Latin usura, to use, was a sum paid for the use of money, i.e., if you want to use my money, I am going to charge you a fee on top of the principle). Jews were forbidden to charge a usury on money borrowed to other Jews, they were allower to charge a usury on loans to outsiders “gentiles”. So, in the traditional context of the word, usury is not forbidden, in the colloquial usage, usury is forbidden.