The uniqueness of credit unions is that they put together the principles and benefits of financial cooperatives, consumer cooperatives and mutual aid funds, born once by trade unions. 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. In the U.S. credit unions timely and full repayment of loans is a common phenomenon. Unpaid and delinquent loans are not more than 3% of their amount. Typically new members of the credit union become citizens having suretyship or recommendations from their friends - members of the credit union. Credit union services are available only to its shareholders. Among the U.S. credit unions, there are three groups that differ in terms of assets, shareholders, and business services. Income derived from the provision of services to its members, does not become the profit of credit union and is distributed among its members in proportion to their savings. Taking a decision to join a credit union, citizens create an organization through which they participate in the shared savings by mutual crediting and joint (collective) use of personal savings. A potential new member of a credit union must submit a recommendation of shareholders in which the referee becomes a warrant of a future member of the credit union.