ANZ New Zealand - the country's biggest bank - has sold its eftpos terminal leasing unit, EFTPOS New Zealand, for an undisclosed sum.

Banks have united to keep mum on how often they give customer details to police without a warrant.

Businesses are more confident about their own outlook and the broader economy, ANZ's monthly survey has found.

Banks are going into battle for new customers with free tablet computers, contributions to house painting and cash handouts all up for grabs.

New Zealand's mostly Australian-owned banks are not as profitable as they appear, despite very strong earnings, the NZ Bankers Association says.

ANZ Bank sees no rush of customers to rivals with death of National brand.

Industry veterans rely on selling their expertise, not hardware or software.

Police got personal banking details of Kim Dotcom and his staff without getting a search warrant in a move that has implications for bank customers.