This article uses the case study of Slovakia and its lackluster experience with a judge-dominated judicial council to demonstrate that formal institutions have only limited impact on the ideational level. We show that the transformation of the Slovak post-communist judiciary relied on the presumption that judges‘ interests are automatically complementary to principles of the rule of law. Therefore, the majority of implemented reforms insulated the judiciary from the political branches of power, but allowed strong hierarchical relationships inside the courts to exist. In contrast to international expectations, judicial authorities used judicial empowerment to create or strengthen competing informal practices, which helped them to maximize their power. We argue that the lack of internalization of judicial independence might explain why institutional self-governance reforms failed to trigger changes in the professional role conception of judges in regimes riddled with deeply embedded informal institutions. In order to tackle this problem, we propose that future research on the relationship between institutional safeguards and decisional judicial independence should focus on the process through which actors internalize new institutional incentives.