Major banks record $207 million increase in combined quarterly profit, however other key profitability measures little changed

A big chunk from loans on residential properties, is my guess. That is why housing cannot fall, RBNZ and our Government are always ready to help.

A few years ago I tracked the combined profits of the banks and found that in 2017 :-

The Deloitte Top 200 companies Herald supplement gave us the figures to put the profits of the banks into some perspective. As follows -
The profit made by the top 30 Financial institutions was $5.245 billion (of that $4.48 billion went to the 4 Australian banks) and the companies in the top 200 companies (which excludes the financial institutions) was $8.721 billion. That in it's self shows that the banks are making far too much. In percentage terms the banks made 37.5% of the profit of the companies and banks combined. The profit made by the listed top 200 companies was $4.402 billion, so the banks made 54.8% of the profit of the listed companies and banks combined. This is similar or slightly more than the figures for the USA. An article in Interest.co reported that in the USA this percentage has steadily increased from a modest figure in the range of 10% or less.
When it all boils down, all banks do is just handle OUR money that flows around our economy. The fact that they are making profits in the order of 50% of the profit of this economy seem totally unjustified. With the efficiencies that automation has bought to banking, the percentage of the economy that they charge should have significantly reduced; not increased.

By 2020 Deloittes reported that the combined profits for the banking sector had risen to $6.2B.  I presume that the banking sector does not include all the 30 companies that made up the finance sector described above.

This sector is out of control and their profits need far more attention than the grocery and petroleum sectors combined.  But what do we do.  Look the other way.  "nothing to see here.  Move along"