Proceedings of Global Business and Social Science Research Conference 11 - 13 May 2015, Grand Mirage Hotel, Bali, Indonesia, ISBN: 978-1-922069-75-7 Bank Efficiency and Non-Performing Financing (NPF) in the Indonesian Islamic Banking Shinta Amalina Hazrati Havidz and Chandra Setiawan This paper investigates the efficiency of Islamic banks in Indonesia by employing Data Envelopment Analysis (DEA) approach, the determinants of banks efficiency, and nonperforming financing (NPF). The authors further examine the inter-temporal relationships between banks efficiency and non-performing financing (NPF) of Islamic Banks in Indonesia to test two hypotheses: „Bad Luck‟ and „Bad Management‟. The data covers the periods of January 2008- September 2014 using quarterly-published report data from Central Bank (Bank Indonesia) with 4 Islamic banks as the sample of research. The banks‟ efficiency is estimated by technical efficiency (TE), pure technical efficiency (PTE), and scale efficiency (SE). Panel Least Square for fixed effect model is used to find the determinants of efficiency and NPF. Panel-VAR model is used to test the two hypotheses „Bad Luck‟ and „Bad Management‟. The finding reveals that there is no Islamic banks that consistently efficient for all periods of research by TE, PTE, and SE. However, Bank Syariah Mandiri indicates as the most efficient averagely among the sample of this research. The overal results show that efficiency of Islamic Banks is affected significantly by return on assets (ROA), operational efficiency ratio (OER), and inflation rates (INF), while financing to deposit ratio (FDR), capital adequacy ratio (CAR), size, and GDP growth rate have insignificant effect on banks efficiency. In term of the determinants of NPF, there are significant effects of size, operational efficiency ratio (OER), and GDP growth rate toward NPF, while return on assets (ROA), financing to deposit ratio (FDR), capital adequacy ratio (CAR), and inflation rate (INF) have no significant effect on NPF. The research supports “Bad Management” hypotheses since it is found that possibly because of poor financing portfolio management of Indonesian Islamic Banking in the period and sample of the research. Keywords: Data Envelopment Analysis, Panel Least Square, Panel-VAR, Bad Luck, Bad Management ___________________________________________________________________________ Shinta Amalina Hazrati Havidz, S.E., M.B.A, Management Study Program – Banking and Finance, President University, Indonesia, Jl. Ki Hajar Dewantara, Kota Jababeka, email: shintahavidz@president.ac.id, HP: +62 812 9784 2989, phone: +62 21 8910 9762, fax: +62 21 8910 9768 (corresponding author). Dr. Chandra Setiawan, Ph.D, Management Study Program – Banking and Finance, President University, Indonesia, Jl. Ki Hajar Dewantara, Kota Jababeka, email: chandra@president.ac.id, HP: +62 816 970 795, phone: +62 21 8910 9762, fax: +62 21 8910 9768