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. Historically, credit unions were preceded by widespread development of credit cooperation in many countries of Europe and America. Typically, donor contributions to the credit unions are targeted and used in the same statutory requirements and restrictions as the Mutual Financial Aid fund as a whole. First Credit Union was savings unprofitable institution, or rather credit cooperative, providing services to its members. Among the U.S. credit unions, there are three groups that differ in terms of assets, shareholders, and business services. The main advantage of credit unions consists in transparency, controllability, governance for shareholders. International cooperation has been particularly felt since the days when Alphonse Desjardins began the activity on development of credit union movement in North America. Initially, the target groups of credit unions were farmers (Raiffeisen), and now they include both individuals (credit unions), and organizations. Worldwide credit union movement is represented by regional confederations and national organizations within the World Council of Credit Unions.