Brock said Kiwibank had 250 locations throughout New Zealand.
The bank has been trialling a bank only branch in Hamilton over the last year which had gone well and there were plans to trial another one in Auckland and Christchurch.
But much of its focus is on the digital side of the business and the bank said 90 per cent of its transactional business was now done online while 31 per cent of product sales to existing customers were done online.
Westpac has pinned its reason for considering the branch closures to the rise in online transactions.
"Currently more than 85 per cent of service transactions with us take place outside of a branch," the bank said when the closures first came to light a few weeks ago.
Ranfurly residents will hold a community rally outside their branch today to protest its potential closure.
Organiser Amie Pont, who owns a shop in Ranfurly, told the Herald earlier this week that the Westpac proposal had come as a shock.
"As a community we feel we are entering into a growth phase. Tourism is growing...we've had a bit of disbelief."
She said it would hit elderly residents hard and make it difficult for local community groups to get access to cash.