I would argue that there is supporting evidence out there for what
@Cumberland Throw is saying based upon what Westpac has been publicly saying and doing over the past 24 months.
Westpac has stated their plans to eliminate 100 co-location branches, merging their BankSA, Bank of Melbourne and St George Bank branches into existing Westpac branches over the next 24 months and has taken over a number of sponsorships previously held by their subsidiaries as they focus on strengthening their 'primary brand'.
Queensland Reds in Super Rugby is possibly the largest sponsorship they took over, with Westpac now on the Reds jersey versus St George Bank, but they have also taken over the St George Open Air cinema in Sydney and BankSA's sponsorship of the SANTOS Down Under.
BankSA also ended their sponsorship of Port Adelaide citing that they will now be focusing more on 'grassroots sponsorship activities' moving forward at the direction of their parent company.