In financial enterprise, electronic banking is an entirely financial enterprise integrated IT which is used for financial data transaction, human resources, and other important financial data management. It should be managed very well otherwise problem in data processing will bring harm to the enterprise. Data loss, transaction failure, and many others problems will bring a long term negative impact towards the enterprise. The presence of local state regulation issued by Bank Indonesia which requires financial institutions to audit electronic banking externally and internally is one of the reasons why this study is conducted. The methodology that used to measure the performance of IT management in a financial enterprise (e.g. Bank X) is the ones based on Framework COBIT 4.1. A mapping is done to make financial enterprise goals in line with COBIT purposes so the relevant domain will be gained to be able to do further assessment. From the questionnaire and interview done in Bank X, it was found that the maturity level average was 3-defined – IT management performance has developed until a phase where standard procedure and documentation process has taken place because of formal training for the users. But, the training was not fixed yet and as a result many shortages could not be detected maximally by the management although there was a policy created previously. The policy was not able to reach best practice level (i.e. level 5-optimized).