The separation of the Unit Usaha Syariah (UUS) of conventional banks into Bank Umum Syariah (BUS) as
stated in the mandate of Law no. 21 of 2008 resulted in the Bank Pembangunan Daerah (BPD) of West
Sumatra, namely Bank Nagari, to participate in determining this policy with the results of the GMS agreeing
on the option of converting Bank Nagari to Bank Nagari Syariah. This conversion decision will of course also
affect the loyalty of Bank Nagari customers themselves. This study aims to see how the influence of knowledge,
religiosity and service quality on customer loyalty when Bank Nagari is converted into Bank Nagari Syariah.
The method used in this study is a quantitative method using multiple linear regression analysis with the
process of collecting data through an online questionnaire using the snowball sampling method. This study
shows that knowledge and service quality have a positive influence on customer loyalty. While religiosity has
a negative influence on customer loyalty.
Keywords: Customer Loyalty, Islamic Bank, Knowledge, Religiosity, Service Quality