At least 22 people were detained as part of an investigation into the Gulen movement on Thursday.
Police carried out operations in 5 provinces in a Kastamonu-based investigation that targeted mostly businessmen and former employees of the now-defunct Bank Asya.
Bank Asya was earlier closed over its ties to the Gulen movement which the government blames for the July 15, 2016 failed coup.
The movement denies involvement in the failed attempt.
More than 150,000 people have been detained and 80,000 arrested over Gulen links since the summer of 2016.