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. Principles of cooperative democracy and interaction were adequate to the purposes for which people joined credit unions. 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 some cases, the initiators of credit unions can be trade unions, associations such as social support centers and others. Corporate alliances are intermediaries between credit unions and financial markets.