“…In order to compete with conventional banks, SB need to improve and maintain their efficiency. Many studies emphasize that efficiency is important because it can be used as an indicator to assess the bank's ability to maintain performance as the agency in charge of collecting and distributing public funds (See, For example, Widiarti et al, 2015, Wheelock & Wilson, 1999, Hidayati et al, 2017, Muharam & Pusvitasari, 2007, Bisri, 2016, Subandi & Ghozali, 2014, and Weill, 2003. Moreover, efficiency can also be used as a measurement of banks' ability to optimize the output so that SB can provide benefits to customers.…”