KPMG cited real estate metrics showing the seasonally adjusted median residential property price rose 7.1 per cent year-on-year in February, while an average two-year mortgage rate is currently around 4.7 per cent, according to interest.co.nz.
The FIPS survey showed the impaired asset expense jumped 70 per cent to about $46m, with seven of the nine banks recording increases. Past due assets fell by 2.1 per cent to $561m.
Gross loans had remained relatively stable and the ratio of impaired asset expense to average gross loans and advances increased by 2 basis points to 0.05 per cent, KPMG said.
"Although all banks increased the value of their gross loan books, the mixed experience with respect to impaired asset expense meant that no clear trend was observable in this ratio across the survey participants," it said in the report.
ANZ Bank remained the biggest by total assets at $157b, ahead of Bank of New Zealand and Commonwealth Bank of Australia on $97b apiece. Of the big four, Westpac Banking Corp recorded the weakest growth in total assets in the quarter with $95.4b, up from about $95b three months earlier.
Profitability showed a similar pattern. ANZ's rose to $520m from $505m, BNZ climbed to $275m from $245m and CBA 's earnings fell to $275m from $292m. Westpac net profit of $268m in the fourth quarter was down from a profit of $282m three months earlier.
Of the smaller banks, Kiwibank total assets were little changed at about $23b while its profit jumped to $28m from $14m.