The banking system is one of the most important elements of an economy. The approaches to study the stability and instability of the banking sector can be classified according to several criteria. Primarily is need to select analysis at macro, meso-level and micro-level. No macro or micro level allows analysis of banking system stability, depending on the structure. From classification of banks, information obtained from meso level can be divided into several parts according to the resulting structure. According to the research methods are distinguish ed economic analysis, statistics and econometric of the banking sector.