The difference between credit unions and banks is clearly is apparent when comparing the structure of assets and liabilities of credit unions and banks. Is necessary that all shareholders of the credit union were members of a single community, would know each other well enough to enjoy mutual trust. First central bank of credit unions appeared in 1876. Credit unions began to appear rapidly in many European countries. Credit unions perform the function of social protection in a vital for people sphere of financial services. They care about improving the financial literacy of the population, are working on the formation of their members and their employees. 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. 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. The relationship between credit unions and shareholders arise from the membership and are not customer relationship. Credit unions are financial institutions, financial cooperatives of citizens, and in this capacity they are above all associations of people, not unification of capitals, which is typical, for example, for public companies.