Business lending was $67 million in September.
The Reserve Bank started publishing mortgage figures broken down by borrower type two months ago.
"New mortgage lending includes borrowing for purchasing houses, loan top-ups to existing home owners, switching of mortgages between banks and small businesses borrowing on their mortgage," its analysis said.
"Borrowers are classified as first home buyers, other owner-occupiers, investors or those borrowing for business purposes."
Of the $359 million loaned in high loan to value ratio mortgages - above 80 per cent of a property's value - s $120 million went to first home buyers, $198 million to other owner occupiers, $38 million to investors and $3 million to business borrowers.