The order have been hiding their own Banks in very specific locations because they never want their money to be mixed with any Banks that are human owned. The reason for this is that they want to be able to avoid any issues with the capital of the top corporations that are not owned fully by the order. This is the reason why there are banks that are 10% dedicated to the order.
They keep track of the finances and all the accounts that are owned by order members are subjected to a completely different set of rules. The banks that hold money for the order don’t even charge any interest. They are basically funded by the order and they act as safety deposits more than anything else. There is not a single dollar of human owned capital in those banks.