The Savings Bank of South Australia and St.George Bank are both part of what banking corporation
Savings Bank of South Australia:  The Bank of South Australia (also known as BankSA) is now a division and a trading name of St.George Bank, which is now a subsidiary of Westpac. St.George Bank:  Since a 2008 merger, the bank has been part of the Westpac Banking Corporation group, having previously been an independent legal entity.
Westpac Banking Corporation