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Deposits - Additional Information (Detail) (USD $) In Billions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Time Deposits [Line Items]
Time deposits of $100,000 or more	$ 1.3	$ 1.6

- Definition

The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more.

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