Mr Direk admitted targeting foreigners because many of them spent large amounts and hardly ever checked for irregularities.
FOUR-YEAR 40 MILLION BAHT CRIME SPREE
Mr Direk had worked for the TMB for more than 10 years.
He would use financial and personal information of bank customers to make ATM cards and then withdraw money from their accounts.
The suspect carried out his crime spree for four years, causing the TMB more than 40 million baht in losses.
Investigators are not convinced Mr Direk was acting alone.
The investigation will be widened to discover whether there were accomplices.