Membership in the credit union is voluntary and is open to all citizens bound by with joint work or residence, who wished to create a credit union to use its services and are willing to take on relevant commitments and responsibilities. Like any financial institution, credit unions have the financial resources. When organizing the credit union it is important that people know each other and know the extent to which each of them is trustworthy. Among the U.S. credit unions, there are three groups that differ in terms of assets, shareholders, and business services. Cooperation between credit unions, how they would not have been named, took place always, from the moment when the movement moved outside one credit union. To reduce the risk of default on loans members of the credit union shall the joint guarantee. 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). In some cases, the initiators of credit unions can be trade unions, associations such as social support centers and others. Unlike banks credit unions limit their activities to a closed circle of people.