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Investment Securities (Details Textual)	Sep. 30, 2012 Security	Dec. 31, 2011 Security
Investment Securities (Textual) [Abstract]
Number of securities having unrealized holding losses with aggregate depreciation	4	9
Unrealized holding losses depreciation	5.00%	6.30%

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Number of securities having unrealized holding losses with aggregate depreciation.

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Unrealized holding losses depreciation percentage from amortized cost.

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