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Interest Bearing Deposits - Additioanal Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Interest Bearing Deposit [Line Items]
Time Deposits, $100,000 or More	$ 27.5	$ 39.5

- 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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