This study examines four major Swedish banks' internationalization process patterns during the period 1961-2010. The study complements earlier studies by also considering the banks' levels of market commitment. One objective is to determine if 'Tit for tat'-behaviour seen in earlier studies of Swedish banks still prevails after the deregulation. Adding to earlier studies, this study also considers the level of market activities and commitments. A secondary purpose is to examine how the financial crisis has affected the banks with reference to the banks' internationalization patterns. The empirical study is based on archival data on the studied banks' foreign operations. The results show that the banks' behaviour follows 'Tit for tat'-behaviour but that the internationalization has accelerated after the deregulation, hence being carried out with 'big steps' rather than small steps. The analysis also shows that the mimetic behaviour is complemented by other types of internationalization behaviours. The differences in bank internationalization also mean that the effect of a financial crisis varies depending on how the banks have internationalized.