A former Brunswick bank teller pleaded guilty Friday in U.S. District Court in Portland to transferring more than $100,000 from a customer’s account into her own over a three-year period.

Cecile Roux, 38, of Harpswell faces up to 30 years in prison and a $1 million fine for embezzling bank funds, according to a news release from U.S. Attorney Thomas E. Delahanty II.

Roux, who was head teller at the Bank of Maine, admitted to transferring $107,000 of a customer’s money into her account in a series of transactions between April 12, 2012, and Aug. 14, 2015.

The Federal Bureau of Investigation and the Brunswick Police Department conducted the investigation.

Roux will be sentenced after the U.S. Probation Office completes a pre-sentence investigation report, the release said, but did not give a date.