Market share gains helped push ASB's interim profit up 7 per cent to a record $474 million.
Loans to customers rose 10 per cent to $68.7 billion on the back of growth in business, commercial, rural and personal lending, the bank said.
Deposits increased 9 per cent, while total operating income rose 7 per cent to $1.1 billion.
ASB's loan impairment expense in the half-year rose 11 per cent to $41 million.
"The [impairment] increase was in line with expectations following strong lending growth and increased rural provisioning, partly offset by improvements in home loan arrears," the bank said.