Investor loans now make up the bulk of mortgages on combined bank loan books.
APRA has reported that investor loans for all banks comprised $425.4 billion at 30 September this year, or 51.5 per cent of total residential lending.
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That compares to a 49.6 per cent share the year before.
Meanwhile, Australia's non-major lenders have seen a significant increase in their share of residential loans over the 12 months to 30 September.
Major banks held $1,014 billion of residential term loans, which marked an annual increase of 8.7 per cent.
Non-major lenders jumped 15.0 per cent to $135.3 billion.
Foreign subsidiary banks rose 5.8 per cent to $54.9 billion, credit unions rose 5.8 per cent to $29.2 billion and building societies climbed 1.1 per cent to $16.6 billion.
APRA noted that the higher growth of other domestic banks and lower growth of building societies and credit unions is in part due to the conversion of eight credit unions and one building society to banks.
[Related: Some brokers surprisingly upbeat about new lending rules]