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The aim of this research is to compare the differences of intermediation, fee-based service activity and efficiency of conventional banks vs Islamic banks in Indonesia for the 2011-2013 period. Moreover, this study also includes some control variables to find their effect on the dependent variables.

This research uses two methods, namely, stochastic frontier approach and panel data regression.

The result indicates that Islamic banks have a higher intermediation ratio, have higher proportion on fee income-to-total operating income and are less efficient. The control variable that has a positively significant effect on intermediation ratio is size; meanwhile, inefficiency and non–loan-earning asset are negatively affecting the intermediation ratio. The control variable that show a positively significant effect on the proportion of fee income-to-total operating income is size; meanwhile, the credit risk variable has no significant effect on the proportion of fee income-to-total operating income. Size and credit risk are the control variables that have a negative relation to efficiency.

This study has significantly contributed to Indonesian Islamic banking based on which the Islamic banking manager should recognize that the intermediation level, fee-based service activity and efficiency are crucially important in establishing competition and maintaining sustainable Islamic banking.