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Investment Securities (Details Textual)	Jun. 30, 2012	Dec. 31, 2011 Securities
Investment Securities (Textual) [Abstract]
Unrealized holding losses depreciation	5.70%	6.30%
Number of securities having unrealized holding losses with aggregate depreciation	8	9

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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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