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Deposits - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Certificates of deposit denominations	$ 100,000
Aggregate amount of certificates of deposit in denominations of $100,000 or more	$ 257,360	$ 241,217

- 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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