Like the credit cooperatives, credit unions form associations of a higher level, which are called corporate credit unions. The uniqueness of credit unions is that they put together the principles and benefits of financial cooperatives, consumer cooperatives and mutual aid funds, born once by trade unions. Among the U.S. credit unions, there are three groups that differ in terms of assets, shareholders, and business services. Credit unions of the open type are still controlled by their members, but at the same time provide services to people who are not its members (external customers). Historically, credit unions have grown from the experience of credit cooperatives, but they took the experience of organizations of mutual aid of citizens by moving methods of social self-protection from labor and toward consumption. Credit Union - a non-profit financial institution specialized in mutual financial assistance by providing savings and credit services to their members. Credit Union - one of the most attractive financial institutions for the public being a non-profit alternative to banks.