After he was fired, Tran solicited several ex-clients at their homes. He may have pocketed $900,000 in funds they thought were being invested in long term accounts.
"The victims that he preyed on were in their 80s and 90s. Yes, very elderly, very trusting sort of people. They relied on their relationship with their banker," said Santa Clara Deputy District Attorney Cherie Bourlard.
In some cases police say Tran forged signatures of recently deceased bank customers and drained their bank accounts.
The thefts came to light after a customer's daughter questioned why her mother's investments were not showing up in her account.
Tran will appear in court Friday morning to face charges of fraud and forgery.