Westpac is promising to better support its subsidiary bank brands after losing customers because of overpriced mortgage products for home owners.

The percentage of Australian consumers who consider a Westpac bank as their main financial institution fell from 16.8 per cent a year ago to 15.4 per cent at the end of 2024/25, even as the lender grew its overall customer deposit level by seven per cent to $723 billion.

The loss of market share came from customers at Westpac's three state-specific regional brands - St George Bank, BankSA and Bank of Melbourne - switching all of their banking to another institution because of overpriced mortgage products for owner-occupiers.

"That was a really humble reminder to us, about not looking at products like mortgages in a standalone return setting, b

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