This study aims to determine the effect of Islamic corporate governance and slack resources on sustainability reporting of Islamic Commercial Banks in Indonesia and Malaysia from 2015-2018. The corporate governance in this study consists of sharia supervisory board, the size, board of directors meeting, and audit committee. This is a quantitative study that used secondary data such as the annual and sustainability report. The reporting proxy was measured by the content analysis method which consisted of 78 items from the six dimensions adopted disclosure of AAOIFI. Furthermore, the analysis technique used was panel data regression with Random Effect Model (REM) as the estimation model. The results showed that the sharia supervisory board has a negative effect on sustainability reporting, while the board size, audit committee, and slack resources have a positive effect. Meanwhile, the board of directors' meeting has no effect on sustainability reporting. Therefore, the related government agencies such as Otoritas Jasa Keuangan (Financial Service Authority/FSA) and Bank Negara Malaysia are able to consider that the regulation related to the composition of sharia supervisory board for banking is in line with international ideal standards.

The research aims to examine the effect of financing types on sustainability reporting with financial performance as a mediating variable. The independent variables in this research are Murabahah Musyarakah, and Mudharabah, while the mediating variable in this research is financial performance measured using Capital Adequacy Ratio (CAR) as a proxy. The Population of this research is Islamic Banking listed in statistical of Otoritas Jasa Keuangan Indonesia and published sustainability reporting and annual reports for the 2014-2017 period. The result of this study concluded that Financing Type proxied with Murabahah financing affects financial performance (CAR), and financial performance (CAR) also affects the Sustainability Reporting. The other proxies of financing type (Musyarakah and Mudharabah) do not affect financial performance. This study also concluded that financial performance variable mediates the effect of Financing type (Murabahah) on Sustainability Reporting.

Using a sample of registered Sharia Commercial Banks (BUS) in Indonesia during 2014-2017, we examine the effect of Sharia Governance on Sustainability Reporting with financial performance as a mediating variable. Our results support the idea that sharia governance (sharia supervisory board, independent commissioner, board of director's meeting and audit committee) has significant influence on the sustainability reporting. Further analysis indicates the mediating role of financial performance in the relationship between sharia governance and sustainability reporting. Our results suggest that it is essential for regulatory agencies to enhance the supervision role of independent commissioners.

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