The main objective of bank management is develop competitive advantages which are able to establish good relationship between the customer and the bank, as well as providing further improvement of the quality of relationship. The goal of this study is to assess both theoretically and empirically the quality of relationship between the customer and the bank and the level of satisfaction of different group of customers in one of the leading commercial bank in Latvia. The research data were obtained by surveying of 73 customers of the bank who were classified into five groups: small and medium-sized enterprises, large enterprises, institutional customers, private persons and non-residents. The answers to the questions were measured applying the Likert scale from 1 to 5. The authors analyzed the obtained data to determine principle interconnections between the mutual relationship management in the bank with the help of factors and discriminant analysis.