What are the categories of offshore banks?

1. Offshore banks with a full license ("Unlimited" class B banks). They get a license from the host country to enable them to engage in banking and / or trust operations outside the host country and have the right to serve customers outside the country in which they are located.

What's irreplaceable role in the central bank?

In all the countries in one form or another there is the most important banking institution - the central bank. These banks are not dealing with the public and private firms, and other banks.