A former personal banker who was accused of defrauding the Westpac Bank and several customers of $1.4 million, has been found guilty.

Susan Bourton had earlier pleaded guilty to 25 of 81 charges, but today after a drawn out trial in the Hamilton District Court, Bourton was found guilty by Judge Philip Connell of the remaining 56 charges.

The 36-year-old's offending, which the Crown said dates back 10 years, included several years when she was a manager at Westpac Bank in Hamilton and included defrauding one client of up to $750,000.

The man and his partner almost lost their home through the complex fraud.

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Bourton was remanded back in custody for sentencing in June.