This paper investigates the linkages among the nonperforming loans and different macroeconomic and bank-specific factors in the Turkish banking sector over the period 2007-2013. The study is motivated by the hypothesis that both different macroeconomic and bank-specific variables have an effect on the quality of the loans. The long run relationship among the non-performing loans and these variables is analyzed by using Johansen-Juselius (1990) cointegration tests; short-run dynamics is tested through Granger Causality test, and the direction of the causality, through the Vector Error Correction Model (VECM). The results show that there exists consistent and strong long-run relationship among the nonperforming loans, macroeconomic variables and bank-specific factors. However, the short-term causal relationships are considerably limited, and, where they exist, especially unidirectional.