Corporate credit unions are united on a cooperative basis in the Central Credit Union (US Central Credit Union). Some credit unions are closed, serving only their members. However, the more and more popularitywin cooperatives of open type. Credit union is created by a group of members who pursue a common interest. Agreeing to make regular contributions, they create a fund from which can borrow money for investments and replenishment of working capital at favorable interest rates. 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 are competitors of savings institutions, adding interest on deposits of members. This applies to the shares, as well as to additional funds transferred to the account in the credit union. In the case of default the shareholder - individual will respond with its property and, in addition, is jointly and severally liable with the credit union's commitments. The relationship between credit unions and shareholders arise from the membership and are not customer relationship.