The number of shareholders of a credit union is limited and formalized by a list. Limit of the number is defined by the assembly and such assembly establishes the charter. The difference between credit unions and banks is clearly is apparent when comparing the structure of assets and liabilities of credit unions and banks. Share contributions are transferred to the credit union on the basis of membership for the whole stay of a shareholder as member of the credit union and are the basis of membership. 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). Unlike banks, in order to use the services of a credit union, you have to become its member, having written an application and having paid thus shares and membership fee.