Currently, private trust in commercial banks declines as a consequence of today´s financial crisis. As past crises, e.g. the Asian crisis, show, the loss of confidence in the financial sector typically causes private agents to withdraw their capital from financial institutions. Thus, the purpose of this paper is to implement the feature of early deposit withdrawal in a New Keynesian framework with commercial banks in order to analyze the implications of a loss of confidence. In addition, we present the optimal monetary policy to ensure a stabilized system.