I read my bible as a Christian, so I know what it says. However I'm not immersed in the culture as it actually played out in practice.

From a reading of the law there seems to be nothing, but I suspect there is something I'm missing. I'm not sure if there is something about who/how you can ask for a loan (thus meaning such a loan couldn't be requested just anytime), or if the culture allowed you to refuse to make big loans then even though the law said you couldn't.