Mutual financial services group CUA is capitalising on record new lending in the 2014/15 financial year, with strong growth in earnings in the December half.CUA reported a net profit of A$28 million for the six months to December - a nine per cent increase over the previous corresponding period.Net interest income was up 5.7 per cent over the previous corresponding period to $113.7 million.CUA chief executive Rob Goudswaard said the average net interest margin during the half was 1.83 per cent. This was down from an average of 1.87 per cent in 2014/15.Goudswaard said the lower NIM reflected the impact of two cash rate reductions last year. CUA has re-priced its owner-occupier and investor mortgages and this will lift the margin for the full year.CUA originated $1.5 billion of loans during the half and its home loan book grew above system, at an annualised rate of 9.2 per cent.CUA increased its bank member numbers by 4124 and its health fund customer numbers by 7074.Goudswaard said the mutual was still reaping the benefit of its investment in a new core banking system, which has been operating since 2013."It has given us flexibility to launch new products quickly. After we re-priced our mortgage book last year we launched a low rate loan at 3.99 per cent for customers who were rate sensitive."Last October we launched a new mobile banking platform and in June we will introduce upgrades to our website, including a facility that will allow customers to apply for their home loans online."CUA has the capability to handle mortgage transactions through the e-conveyancing platform PEXA and it is sending comprehensive credit reporting data to credit bureaus, with the expectation of going live later this year.