“…The early empirical literature, which analyzed the efficiency and productivity of financial institutions by using either parametric or non-parametric frontier methods, is mainly dominated by studies on the United States and other industrialized countries (Berger and Humphrey 1997;Amel et al 2002, Fiordelisi et al 2011. In recent years, however, great attention has been devoted to analyzing the efficiency and productivity of banking sectors in developing economies (e.g., Carvallo and Kasman 2005;Staikouras et al 2008;Olson and Zoubi 2011;Vu and Nahm 2013) and studying the impact of the macroeconomic environment on banking efficiency (e.g., Drake et al 2006;Sufian 2009), as well as to financial deregulation (e.g., Das and Ghosh 2009;Pasiouras 2009;Barth et al 2013, Chortareas et al 2009 Other studies have explored the effects of bank-specific characteristics on performance by incorporating into the analysis, for example, bank strategy, ownership structure, corporate governance and risk-taking, liquidity levels, capital, and loan-loss provisioning, among other aspects. 3 Loans represent a major share of the total outputs provided by a bank, but as lending involves risk, there is always the possibility for a loan to become non-performing (Chang and Chiu 2006).…”