Question: The Savings Bank of South Australia and St.George Bank are both part of what banking corporation

Context paragraphs:
Federal savings bank: In United States banking, a federal savings bank (FSB) is a savings bank that is created (or chartered) under and regulated by United States federal law, and administered by the United States Department of the Treasury's Office of the Comptroller of the Currency.  The Federal Deposit Insurance Corporation (FDIC) insures deposit accounts in federal savings banks up to prescribed limits.

National Savings Bank (Sri Lanka): National Savings Bank (NSB), is a state-owned Savings Bank in Sri Lanka.  It was incorporated in Ceylon by the "National Savings Bank Act No. 30" of 1971 and was granted the status of the Licensed Specialised Bank in terms of the "Banking Act No. 30 "of 1988.  NSB has 227 branches.  It also carries out postal banking with the cooperation of 643 post offices and 3,4012 sub-post offices of the Sri Lanka Post.

Union Dime Savings Bank: Union Dime Savings Bank was originally chartered in 1859 in New York City, USA.  By the time of bank deregulation in 1979 it was starting to suffer losses.  With the direction of the Federal Deposit Insurance Corporation, it was acquired by Buffalo Savings Bank and, along with the New York Bank for Savings, became part of the renamed Goldome.  In 1990, Manufacturers Hanover Trust bought $2.8 billion in deposits in 24 New York City branches for $27.7 million.  By late 1991, Goldome failed and its New York assets were sold to Manufacturers Hanover Trust and the East New York Savings Bank.  An exhibition by Siri Berg based on Arthur Schnitzler's "Reigen" or "La Ronde" became a permanent installation of Union Dime Savings Bank.

Savings Bank of South Australia: The Savings Bank of South Australia was founded in 1848, trading from a single room in Gawler Place, Adelaide.  In 1984 it merged with the State Bank of South Australia, with the merged entity taking the latter name.  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: St.George Bank is an Australian bank with its headquarters in Sydney.  Since a 2008 merger, the bank has been part of the Westpac Banking Corporation group, having previously been an independent legal entity.  In 2010, as part of the Westpac group, St.George was deregistered as a company and ceased to be a standalone authorised deposit-taking institution (ADI).

Williamsburgh Savings Bank: The Williamsburgh Savings Bank was an important institution in Brooklyn, New York, from the mid-19th to the mid-20th centuries.  A series of bank mergers brought it into the HSBC group late in the 20th century.  Williamsburgh Savings Bank opened the building in 1875.  It is best remembered for two imposing headquarters buildings still standing, the domed original at 175 Broadway in Williamsburg, Brooklyn, designed by George B. Post, and the later Williamsburgh Savings Bank Tower.

Kim Se-jin (volleyball): Kim Se-jin (Korean: 김세진 ; born January 30, 1974) is a retired volleyball player from South Korea, who currently coaches the Ansan OK Savings Bank in V-League.  As a player Kim competed with the South Korean national team from 1992 to 2003 and took part in the 1992, 1996 and 2000 Olympics.  At the 1994 World League Kim was honored as best spiker with the 52.08% success percentage in attack (349 successful attacks for 670 attempts).  since 2013.  he plays in ok savings bank volleyball team as headcoach.  and ok savings bank volleyball team win Korean v league(volleyball) 2014-15, 2015-16.

Westland Savings Bank: Westland Savings Bank was one of 14 regional trustee savings banks operating in New Zealand.  WSB was based on the West Coast of the South Island of New Zealand.  Formed as a savings bank under special banking legislation that separated savings banks from trading banks.

State Savings Bank (Council Bluffs, Iowa): State Savings Bank, also known as the Old Savings Bank, is a historic building located in Council Bluffs, Iowa, United States.  the bank was established in 1889, and was originally located across the street.  Planning for this building began in 1941 with the organization of the State Investment Company, which would build and own the building.  It was designed by W.G. Knoebel and built by St. Louis-based Bank Building and Equipment Corporation of America.  It is a late example of Art Deco, and it's the only building in Council Bluffs that exhibits this style.  Two-thirds of the building is a single-story banking facility, and the rest is divided into two-stories of office space.  It has one of the first drive-through teller windows in Iowa.  The rectangular building's exterior is finished in gray limestone on two elevations, and a wrap-around continuation on a third.  Its primary decorative feature is an inscribed harvest motif on the east and west elevations that are mirror images of each other, oriented to the north.  The motif features a male nude holding a wagon wheel and a scythe, with sheaves of wheat and a dog.

Aurora Bank: Aurora Bank is a federal savings bank (FSB) headquartered in Wilmington, Delaware.  It is a mid-size bank that offers full-scale banking services.  Aurora Bank was founded on January 1, 1921, in Wilmington, Delaware, under the name of Delaware Savings And Loan Association.  On January 2, 1958, deposits made to the bank were first insured by the Federal Deposit Insurance Corporation (FDIC).  In 1988, the bank was renamed to Delaware Savings Bank, FSB.  On April 1, 2009, the bank changed its name to Aurora Bank, FSB.  Aurora Bank was a subsidiary of Lehman Brothers Bancorp.  In June 2012, Aurora Bank exited most of the financial services business, with accounts transferred to other companies.

Supporting paragraphs: Savings Bank of South Australia St.George Bank
Answer: Westpac Banking Corporation