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Disclosures about fair value of assets and liabilities (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Disclosures About Fair Value of Assets and Liabilities (Textual) [Abstract] |  |
Reduction in carrying amount of mortgage servicing rights | $ 1,000,000 | $ 856,000

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- Definition Reduction in carrying amount of mortgage servicing rights. + References No definition available. + Details
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