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Investment Securities (Details Textual) | Jun. 30, 2012 | Dec. 31, 2011 Securities
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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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- Definition Unrealized holding losses depreciation percentage from amortized cost. + References No definition available. + Details
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