Kiwibank is still on top when it comes to customer satisfaction, according to the latest data.
Roy Morgan's research shows the New Zealand-owned bank has retained its spot for the month of May, which makes its stretch of having the highest level of happy customers span two years.
Pip Elliot, New Zealand's general manager of Roy Morgan research, said Kiwibank is taking on its bigger rivals.
"Major banks are defined as the ANZ, ASB, Bank of New Zealand, Kiwibank, National Bank and Westpac. In spite of Kiwibank being the newest entrant to the major bank category, its customer satisfaction has consistently out-performed all other major banks," she said.
The level of customer satisfaction for Kiwibank hit 84% in May, followed closely by Bank of New Zealand at 82%.
Bank of New Zealand has increased its content customer level by six percentage points since May 2010.
Taking the biggest dip was National Bank, with satisfaction down to 78% from 81% two years ago.