Suncorp's banking and wealth division produced a relatively healthy result for the December half, compared with the heavy fall in the company's insurance business. By any other measure it was a pretty ordinary banking result.The group reported a 44.7 per cent fall in net profit, driven by a 43.2 per cent decline in the insurance division. Suncorp said it was hit by natural hazard costs significantly above allowance and poor investment performance.Some of Suncorp's overall metrics were extremely poor. Return on equity was 3.6 per cent (6 per cent on a cash earnings basis). The dividend was cut from 33 cents a share in December 2017 to 26 cents in the latest half, but this represented a payout ratio of 134.5 per cent (81.4 per cent on a cash basis).Banking and wealth was down just 1.1 per cent. The division's net interest income for the half was A$585 million - down 2.2 per cent on the previous corresponding period. The division's non-interest income fell 32 per cent to $23 million.The division's net profit was $182 million.Home lending grew just 0.8 per cent, compared with the June half last year, and business lending 4.3 per cent. Consumer lending was down 7.4 per cent and a whopping 35 per cent year on year.The net interest margin fell three bps to 1.79 per cent. Suncorp said this was due to a higher bank bill swap rate, increased cost of customer deposits and price competition in the mortgage market.A highlight was that impairment losses were a miniscule $7 million - two basis points of gross loans and acceptances.Suncorp warned that there would not be much change in banking conditions in the near term. "Banking will continue to target sustainable lending growth where margins and risk are acceptable. The moderation of system growth is expected to continue in the second half, driven by a slowing housing market and the tightening of serviceability and lending standards across the industry," it said.The net interest margin will remain at the bottom of the target range of 180 to 190 bps.