Banks, as the institutions of public confidence, occupy an important place in the state's economic system. The efficient functioning of any economy depends predominantly on the safe, secure and modern banking system. Disturbances in financial system's work and the effectiveness of financial mediation's services negatively affect the situation of enterprises and households. The effective functioning of banks depends to a large extent on the stability and confidence, which they acquire in the market. Financial stability is, along with high productivity, high employment levels and international cooperation, an essential condition for economic growth. A major consequence of the financial instability is financial crisis, often identified with the bank crisis, because in most developing countries the banking system has the dominant position in the financial system. The weakness of county's banking system, regardless of whether it is a highly developed country or developing country, can threaten the stability of the whole economy, both domestic and global.