The Bank of New Zealand's managing director and chief executive Andrew Thorburn is to leave the bank to become chief executive of the parent company, National Australia Bank, effective from August.
An announcement on a replacement for Thorburn would be made "in due course,'' the bank said in a statement. Thorburn has been with the BNZ for five and half years.
Thorburn will replace NAB chief executive Cameron Clyne, who will retire in August. Thorburn was born in Australia but moved to New Zealand with his family when he was young.
BNZ chairman John Waller congratulated Thorburn on his appointment.
"The BNZ board sincerely thanks Andrew for his inspirational leadership of the bank at a truly challenging time, beginning in September 2008 as the global financial crisis was unfolding,'' he said.