Service industry can be divided largely into commercial industry, banking industry, insurance industry, advertising industry, and tourism industry. Of these, banking industry is playing an essential role as it constitutes the backbone of economy. Banking industry, which belongs to financial industry, is sensitive to external environment. In this kind of industry, internal dynamics of an organization is very important. The purpose of this research is to find out what kind of influence the relation of internal dynamics perceived by members of Nonghyup organization has on customer orientation via quality of internal service. For the purpose, we have reviewed preceding studies on variables that affect customer orientation and developed a measuring tool in a form that fits banking organizations. Internal service quality, job satisfaction, and organizational immersion which play a mediating role in the model of this research not only turned out to have a significant influence on customer orientation, they also turned out to have the strongest influence. This research has academic significance as it carried out a research with an emphasis on variables that affect customer orientation of members of Nonghyup organization. Regarding practical significance, it was intended to present useful data that can be utilized for an analysis of internal service quality management and capability of human resource management.