PORTLAND — A Rockland woman has pleaded guilty to stealing more than $400,000 from the bank where she worked.

Federal prosecutors say 44-year-old Shauna Quinn pleaded guilty Tuesday in U.S. District Court in Portland to bank fraud.

Investigators say that between July 2008 and June 2011, while the 44-year-old Quinn worked as a collections manager at Rockland Savings Bank, she created home equity lines of credit and a share loan in the names of family members and had more than $400,000 in funds improperly withdrawn from those loans.

She increased the authorized amounts of lines of credit without approval, changed customers’ mail addresses without consent, improperly posted transactions and created fictitious loan documents.

She faces up to 30 years in prison at sentencing, which has not been scheduled.