The realization of the principles of sustainable development is a necessity of the time, which would result with effective outcomes corresponding to the contemporary ecological foresights and to the society`s interests. The sustainable development (sustainability) is prosperity, the welfare of humanity and the environment, that doesn`t reduce the opportunities of the following generations, supporting the economic continuity for the current generation. The sustainability is a complex problem, which requires multisector cooperation, the implication of the government, the non-governmental sector, the people, the companies and the financial sector. To ensure business sustainability, the companies all around the world decide to be actively involved in the durable development of their countries, integrating principles of social responsibility in the essence of the conducted business. The role of financial institutions, and in particular, of the banks is major, they having the possibility of becoming the catalyst of sustainable development. The banking system is one the most deeply integrated in the national economy because of his lending activity, as well as the collecting and aggregation of the retail and corporate money. Therefore, it is the most sensitive at the macroeconomic changes, showing a procyclical behavior.