Kiwibank's expenses grew faster than income in the September quarter and it continues to lose ground in the mortgage market.
Westpac's mortgage book surged by about $1 billion in the September quarter but it still lost market share in the year ended September.
Reserve Bank has named and shamed Kiwibank, but the bank says it's confident it hasn't been involved in any money laundering or financing of terrorism.
The other major banks appear to be more ready to respect their customers' privacy than Westpac.
Plus special feature audio: Paul Brislen savages Westpac