ASB today reported a net profit of $630 million for the six months ended 31 December.
This represents a 6 per cent increase on the profit made during the same period the previous year.
ASB chief executive Vittoria Shortt noted that while the New Zealand economy remained sound, there were some concerns on the horizon.
"We have observed a cooling housing market, weaker business sentiment and softening immigration, combined with an uncertain global outlook," she said in a statement.
Despite its solid result, ASB did see loan impairment expenses, which includes write-offs for bad debts, increase by 73 per cent to $45 million.