KiwiBank's first half profit at $37.9 million has rebounded strongly from $13.9 million in the same period a year ago.
Chief executive Paul Brock said the state-owned bank, which is approaching its 10th anniversary, was continuing a very positive growth path" after its result a year ago was "severely undermined by the global financial crisis and the Christchurch earthquakes".
"Our underlying performance has always been strong, with consistent growth in lending and deposits and improving margins.
"We have largely worked through the set backs associated with the global economy and with the events in Christchurch.
After almost ten years in business the bank's success was "beyond question".
"We have moved through a very challenging economic cycle in very good shape and the bank's profitability continues to grow."
Nevertheless Brock said the bank was wary of the European debt problems which could have an effect on its funding costs.
"We're not out of the woods yet."