...Australian Unity Bank's (AUB) parent, the Australian Unity Ltd. (AUL) group, will provide extraordinary support to the mutual bank in most circumstances, if needed. This reflects our view that AUB is an important part of the diversified AUL group. Consequently, we rate the mutual bank one notch above our assessment of its stand-alone credit profile (SACP). AUB's capitalization remains its key stand-alone credit strength. We forecast the mutual lender's risk-adjusted capital (RAC) ratio will decrease to 17.0%-17.5% over the next two years driven by above-system loan growth. Further capital injections from AUL will support AUB's RAC ratio, which was 17.4% as of Dec. 31, 2023. AUB's small scale constrains its business stability. The mutual bank has a market share of about 0.05% of the banking system as of March 31, 2024. Like all mutual banks, AUB remains a price taker in Australia's lending and deposit markets. We view AUB as vulnerable to competitive pressures in the country's highly commoditized...