The study evaluates interbank performance of Islamic Banks in Indonesia on profitability, liquidity, risk and solvency; and community involvement for the period 2000 – 2004. Financial ratios are applied in measuring these performances. F-test are used in determining their significance. The study found that Islamic Banks are relatively more commitment to community development, but less liquid compared to the Government Banks, Foreign Banks, and Commercial Banks. Islamic Banks do not show (statistically) any difference in performance and managerial performance with the Government Banks and Commercial Banks, but Islamic Banks are less performance and managerial performance with the Foreign Banks. Islamic Banks are relatively more cost efficient compared to the Government Banks and Commercial Banks; more profit (NIM) compared to the Commercial Banks; and relatively less risky compared to the Foreign Banks.