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Investment Securities Available for Sale (Narrative) (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Financial Statement Details [Line Items]
Realized gains on the sale of investment securities available for sale	$ 226,000	$ 226,000
Investment securities available for sale, callable, Amortized cost	55,000,000	55,000,000
Investment securities available for sale, callable, Estimated market	$ 42,400,000	$ 42,400,000

This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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