Australia's mutual banks and credit unions have more than tripled their combined mortgage book in seven years, amassing $150.9 billion in residential lending and nearly doubling their market share — and the acceleration is getting faster, not slower.
That is the picture from APRA's Monthly Authorised Deposit-taking Institution Statistics, which show the combined mortgage book of Australia's major mutual lenders growing from $54.3 billion in March 2019 to $150.9 billion in March 2026. Their share of the national mortgage market has risen from 3.2 per cent to 6.1 per cent over that period — a gain of nearly three percentage points that has come almost entirely at the expense of the major banks.
In the year to March 2026 alone, the sector added $27.3 billion in new mortgage balances — growth of 22 per cent in a single year, compared to 6.9 per cent for the market as a whole.
Part of the sector's headline growth reflects consolidation. Two significant mergers completed in early 2023 brought Heritage Bank and Australian Central Credit Union (trading as People's Choice) together as Heritage and People's Choice Limited, now the sector's largest mutual lender with a $21.2 billion book. Newcastle Permanent Building Society and Greater Bank similarly merged to form Newcastle Greater Mutual Group, which holds $19.0 billion. Prior to those mergers, both pairs of institutions were reported separately on the APRA register, and their combination added significant scale to the mutual sector's aggregate numbers.
But the growth story is not just a merger story. Credit Union Australia, which has operated under the Great Southern Bank brand since 2021, has grown its book by 44 per cent since 2019 to $18.3 billion. Bank Australia — one of the sector's most distinctive propositions, built around responsible and ethical lending — has expanded by 261 per cent over the same period, from $4.5 billion to $16.3 billion, making it one of the fastest-growing lenders of any type in the country.
MyState Bank in Tasmania has grown 226 per cent to $10.7 billion. Beyond Bank has more than doubled to $9.5 billion. Regional Australia Bank has nearly tripled. Unity Bank has grown 186 per cent. Across almost every mutual lender in the APRA dataset, the story is the same: sustained, consistent growth that has compounded into a formidable collective force.
The mutual sector's gains have not come from a particular rate war or a single moment of competitive advantage. They have come from a slow and steady accumulation of broker-originated and direct-to-consumer volume, driven by a combination of competitive pricing, ethical brand positioning, and — increasingly — investment in broker channels and digital infrastructure.
For brokers, this shift matters in two ways. First, it means mutual lenders are now large enough to be genuine panel contenders for a much wider range of clients than they were five years ago. A lender writing $20 billion in mortgages has a different capacity to process volume, invest in BDM networks, and maintain competitive turnaround times than one writing $5 billion.
Second, the growth of the mutual sector has created a more genuinely diverse lending landscape for clients who do not fit neatly into major bank credit policy. Member-owned institutions have historically been more flexible on niche employment types, specific property categories, and clients with non-standard income structures — and their growing scale means brokers can place more volume with them without compromising on service standards.
The mutual sector's growth has been substantially broker-driven. Heritage and People's Choice, Teachers Mutual Bank, Beyond Bank, Police & Nurses and others have all deepened their investment in broker relationships over the past several years, adding BDMs, streamlining accreditation, and building out broker-specific online portals.
Teachers Mutual Bank, which covers teachers, emergency services workers, university staff and healthcare employees through a family of four brands, has grown its book by 61 per cent since 2019 to $10.1 billion. Its multiple brand strategy — Teachers Mutual, Firefighters Mutual, UniBank, and Health Professionals Bank — allows brokers to match clients to an institution with a genuine community connection, which can resonate strongly with eligible borrowers.
If the mutual sector continues growing at even half its recent rate, it will approach $250 billion in mortgage balances by 2030 — putting it within striking distance of NAB's current book size.
The question for brokers is not whether to include mutual lenders on their panels, but how actively to leverage them. In a market where the big four are tightening credit conditions, managing margin carefully, and facing growing scrutiny over their DTI exposures, the mutual sector's willingness to compete for volume — and its structural alignment with member outcomes rather than shareholder returns — is a genuine differentiator.
The sleeping giant, it turns out, has been wide awake for years.
