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. Fund of Mutual Financial Aid of the credit union can be extended by sponsorship contributions from businesses, organizations, including on a returnable basis. Corporate credit unions are united on a cooperative basis in the Central Credit Union (US Central Credit Union). First Credit Union was savings unprofitable institution, or rather credit cooperative, providing services to its members. When organizing the credit union it is important that people know each other and know the extent to which each of them is trustworthy. Over 30% of the assets of credit unions are investments in government securities, certificates of deposit of banks and savings loan associations, as well as in the parent credit unions, and other risk-free investments. The relationship of shareholders with credit union are not client-based, they are co-operative, based on different principles and standards, in particular, on the principles of the law of obligations. The relationship between credit unions and shareholders arise from the membership and are not customer relationship.