Jessica Harper admitted fraud by abuse of position and transferring criminal property defrauded from her employers.
Between 2007 and 2011, she paid herself £2.5m through false and doctored invoices while working as head of fraud and security for digital banking at the company, the BBC reports.
The 50-year-old South Croydon resident, who was earning £60,000 a year at the time, passed the proceeds to friends and her three brothers to invest in property.
Judge Deborah Taylor told her: “You were a senior employee in the bank in a position with a high degree of trust at a time when Lloyds was substantially supported by a lot of taxpayers’ money following difficulties sustained by the bank in the financial crisis.
“You disregarded your duties out of a sense of entitlement to take other people’s money for your own benefit and that of your family.”
Southwark Crown Court had previously heard that Harper had already repaid £300,000 and was in the process of selling her house for about £700,000.